Battery

Abstract

The invention relates to the technical field of battery processing and manufacturing, in particular to a battery which comprises a shell. The battery cell is arranged in the shell; the cover plate structure comprises a cover plate, a pole assembly and a collector plate, the cover plate covers the shell, a pole mounting hole is formed in the cover plate, the pole assembly comprises a pole body and a pole bottom plate, the pole bottom plate is arranged on the side, close to the battery cell, of the cover plate, and the pole body is arranged on the side, away from the battery cell, of the cover plate and penetrates through the pole mounting hole to be connected with the pole bottom plate; the collector plate is arranged on one side, deviating from the cover plate, of the pole bottom plate, and the edges of the two sides of the pole bottom plate are welded with the collector plate. The edges of the two sides of the pole bottom plate are welded with the collector plates, so that a current path is optimized, the internal resistance of the battery is reduced, and the battery can stably work under a high-current condition, so that the overcurrent capability of the battery is improved, the service life of the battery is prolonged, the operation time and reliability of equipment are improved, the battery is prevented from being overheated, and the service life of the battery is prolonged. And the safety of the battery is improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery processing and manufacturing, and in particular to a battery. Background Art

[0002] With the continuous development of new energy technologies, the performance requirements for battery packs are increasing day by day. Cylindrical batteries have become an ideal battery cell structure due to their high energy density, simple structure, low cost and many other advantages.

[0003] However, traditional cylindrical batteries often struggle to achieve both high energy density and fast charging performance. The traditional terminal and collector plate design often cannot effectively support the stable transmission of high currents under high-rate charge and discharge conditions, affecting battery safety and performance. Summary of the Invention

[0004] The present application provides a battery for improving the battery's overcurrent capability, enhancing the stability and efficiency of current transmission, and thereby improving the battery's performance and safety under high-rate charge and discharge conditions.

[0005] In order to achieve the above objectives, this application adopts the following technical solutions:

[0006] In one aspect, the present application provides a battery, comprising:

[0007] case;

[0008] A battery cell, wherein the battery cell is arranged in the shell;

[0009] The cover plate structure includes a cover plate, a pole assembly and a collecting plate. The cover plate covers the shell and is provided with a pole mounting hole. The pole assembly includes a pole body and a pole bottom plate. The pole bottom plate is provided on the side of the cover plate close to the battery cell, the pole body is provided on the side of the cover plate away from the battery cell, and is connected to the pole bottom plate through the pole mounting hole. The collecting plate is provided on the side of the pole bottom plate away from the cover plate. Along the length direction of the pole bottom plate, the two side edges of the pole bottom plate are welded to the collecting plate.

[0010] As an optional implementation, the collecting disc is circular, the arc length of the welding area between the pole bottom plate and the collecting disc is L1, and the circumference of the collecting disc is L3, wherein L1 and L3 satisfy: 0.2L3≤L1≤0.7L3.

[0011] As an optional embodiment, the collecting plate includes a middle area, a connecting area and a welding area. The connecting area connects the middle area and the welding area. The two side edges of the pole base plate are welded to the welding area. Along the thickness direction of the collecting plate, the plane where the welding area is located and the plane where the middle area is located are staggered with each other.

[0012] As an optional embodiment, a current collecting disc positioning portion is provided on a side of the middle area facing the pole bottom plate, and the pole bottom plate is provided with a current collecting disc positioning piece that cooperates with the current collecting disc positioning portion.

[0013] As an optional embodiment, the current collecting plate positioning portion is hollow, and two current collecting plate positioning portions are symmetrically arranged along the axis of the middle area.

[0014] As an optional embodiment, the pole bottom plate is provided with a fixing hole, the pole body is passed through the fixing hole, and is welded to the pole bottom plate through the fixing hole. A protrusion is provided on the side of the pole bottom plate facing the cover plate, and the protrusion is arranged around the fixing hole.

[0015] As an optional implementation, along the thickness direction of the pole bottom plate, the height of the protrusion is h2, the thickness of the pole bottom plate is H, and h2 and H satisfy: 0.4H≤h2≤3H.

[0016] As an optional implementation, the pole body is a copper-aluminum composite structure.

[0017] As an optional implementation, a bulge is provided on the side of the collecting disc facing the pole bottom plate, and a flow gap is provided on the bulge.

[0018] As an optional embodiment, the cover plate structure further includes a lower partition, which is provided between the cover plate and the pole bottom plate. An abutment column is provided on the side of the lower partition facing the collecting plate, and the abutment column abuts against the collecting plate.

[0019] The battery provided in the present application designs the pole assembly into the form of a pole body and a pole base plate, so that the pole body is connected to the pole base plate through the cover plate, and by welding the two side edges of the pole base plate to the current collecting plate, a greater flow capacity is provided between the current collecting plate and the pole assembly, which enables the battery to be charged and discharged at a high rate, thereby improving the fast charging performance of the battery; at the same time, the welding connection method optimizes the current path, reduces the heat accumulation caused by resistance, prevents the battery from overheating, and improves the safety of the battery. The welded connection between the pole base plate and the current collecting plate also enhances the overall stability of the battery structure, reduces the risk of loose electrical connections due to vibration or impact, and significantly enhances the stability and conductivity of the current transmission path. This structural design effectively improves the battery's flow capacity, enables the battery to be charged and discharged at a high rate, and at the same time, the battery can work stably under high current conditions, so that the battery has higher current transmission efficiency and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0021] Figure 1 A cross-sectional view of a battery provided in an embodiment of the present application;

[0022] Figure 2 for Figure 1 One of the partially exploded structural diagrams of the cover structure of the battery shown;

[0023] Figure 3 for Figure 1 The second schematic diagram of the partially exploded structure of the cover structure of the battery shown;

[0024] Figure 4 for Figure 2 A schematic structural diagram of a current collecting plate of the cover structure shown;

[0025] Figure 5 for Figure 1 A cross-sectional view of a portion of the battery structure shown;

[0026] Figure 6 for Figure 1 A cross-sectional view of the cover structure of the battery shown;

[0027] Figure 7 for Figure 2 A schematic structural diagram of the lower partition of the cover structure shown;

[0028] Figure 8 for Figure 7 A cross-sectional view of the lower bulkhead is shown.

[0029] Description of reference numerals:

[0030] 100 - cover plate structure; 10 - cover plate; 11 - cover plate positioning hole; 12 - pole mounting hole; 13 - housing positioning step; 14 - explosion-proof valve; 15 - injection hole; 20 - lower partition; 21 - cover plate positioning portion; 211 - channel; 22 - pole positioning portion; 221 - arc-shaped portion; 222 - pole positioning column; 23 - abutment column; 24 - thinning groove; 25 - pole hole; 26 - connecting groove; 30 - pole assembly; 31 - pole body; 311 - plate portion; 312-column; 32-pole bottom plate; 321-pole positioning hole; 322-collecting plate positioning piece; 323-fixing hole; 324-sunk groove; 325-protrusion; 40-collecting plate; 41-middle area; 411-convex bump; 412-circulation gap; 413-collecting plate positioning part; 414-weight reduction hole; 42-connection area; 43-welding area; 50-upper partition; 60-sealing ring; 200-battery; 201-housing; 202-battery cell. DETAILED DESCRIPTION

[0031] To make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0032] With the continuous development of new energy technologies, the performance requirements for battery packs are increasing day by day. Cylindrical batteries have become an ideal battery cell structure due to their high energy density, simple structure, low cost and many other advantages.

[0033] However, traditional cylindrical batteries often struggle to achieve both high energy density and fast charging performance. The traditional terminal and collector plate design often cannot effectively support the stable transmission of high currents under high-rate charge and discharge conditions, affecting battery safety and performance.

[0034] In order to overcome the defects in the existing technology, after repeated thinking and verification, the inventors found that if the pole assembly is designed in the form of a pole body and a pole base plate on the cover of the cylindrical battery, the pole body is connected to the pole base plate through the cover, and the two side edges of the pole base plate are welded to the collecting plate, the battery's current flow capacity is improved, the current path is optimized, and the overall stability of the battery structure is enhanced, so that the battery can operate stably under high current conditions.

[0035] In view of this, the present application provides a battery, comprising:

[0036] case;

[0037] A battery cell, wherein the battery cell is arranged in the shell;

[0038] The cover plate structure includes a cover plate, a pole assembly and a collecting plate. The cover plate covers the shell and is provided with a pole mounting hole. The pole assembly includes a pole body and a pole bottom plate. The pole bottom plate is provided on the side of the cover plate close to the battery cell, the pole body is provided on the side of the cover plate away from the battery cell, and is connected to the pole bottom plate through the pole mounting hole. The collecting plate is provided on the side of the pole bottom plate away from the cover plate. Along the length direction of the pole bottom plate, the two side edges of the pole bottom plate are welded to the collecting plate.

[0039] The pole assembly is designed to consist of a pole body and a pole base plate. The pole body is connected to the pole base plate through the cover plate. By welding the two side edges of the pole base plate to the current collecting plate, the current collecting plate and the pole assembly have a greater flow capacity, enabling the battery to charge and discharge at high rates, improving the battery's fast charging performance. At the same time, the welding connection method optimizes the current path, reduces heat accumulation caused by resistance, prevents battery overheating, and improves battery safety. The welded connection between the pole base plate and the current collecting plate also enhances the overall stability of the battery structure, reduces the risk of loose electrical connections due to vibration or impact, and significantly enhances the stability and conductivity of the current transmission path. This structural design effectively improves the battery's flow capacity, enabling the battery to charge and discharge at high rates. At the same time, the battery can operate stably under high current conditions, giving the battery higher current transmission efficiency and reliability.

[0040] The contents of this application will be described in detail below with reference to the accompanying drawings so that those skilled in the art can understand the contents of this application more clearly and in detail.

[0041] The specific structure of the battery and various possible implementation methods are described in detail below.

[0042] Figure 1 A cross-sectional view of a battery provided in an embodiment of the present application. Figure 2 for Figure 1 One of the partially exploded structural schematic diagrams of the battery cover structure shown. Figure 3 for Figure 1 The second schematic diagram of the partially exploded structure of the battery cover structure shown. Figure 4 for Figure 2 Schematic diagram of the structure of the collecting plate of the cover structure shown. Figure 5 for Figure 1 A cross-sectional view of a portion of the battery structure shown. Figure 6 for Figure 1 A cross-sectional view of the cover structure of the battery shown. Figure 7 for Figure 2 Schematic diagram of the structure of the lower partition of the cover structure shown. Figure 8 for Figure 7 A cross-sectional view of the lower bulkhead is shown.

[0043] like Figure 1 As shown, the battery 200 provided in the embodiment of the present application includes a shell 201 , a battery cell 202 and a cover structure 100 . The battery cell 202 is disposed in the shell 201 , and the cover structure 100 covers the shell 201 to seal the battery cell 202 .

[0044] The battery 200 is not limited to lithium batteries, and in the future this technology may be applied to sodium batteries, etc. In the embodiment of the present application, lithium-ion batteries are preferred.

[0045] As an optional embodiment, the battery 200 is a cylindrical battery structure.

[0046] like Figure 2 and Figure 3 As shown, the cover plate structure 100 includes a cover plate 10, a pole assembly 30 and a current collecting plate 40. The cover plate 10 covers the housing 201. The pole assembly 30 includes a pole body 31 and a pole bottom plate 32. The pole body 31 and the pole bottom plate 32 are respectively arranged on both sides of the cover plate 10. That is, the pole bottom plate 32 is arranged on the side of the cover plate 10 close to the battery cell 202. The pole body 31 is arranged on the side of the cover plate 10 away from the battery cell 202, and passes through the cover plate 10 to be connected to the pole bottom plate 32. The current collecting plate 40 is arranged between the pole bottom plate 32 and the battery cell 202, that is, the current collecting plate 40 is arranged on the side of the pole bottom plate 32 away from the cover plate 10.

[0047] Along the length direction of the pole bottom plate 32 , both side edges of the pole bottom plate 32 are welded to the current collecting plate 40 .

[0048] The pole bottom plate 32 is roughly rectangular in shape, having two arc sides and two straight sides. The straight sides are the long sides of the pole bottom plate 32. That is, the length direction of the pole bottom plate 32 is the extension direction of the straight sides.

[0049] The collecting plate 40 is a sheet-like structure. The lower surface of the collecting plate 40 abuts against and is welded to the battery cell 202 , and the pole bottom plate 32 is welded to the upper surface of the collecting plate 40 .

[0050] The pole assembly 30 is designed to consist of a pole body 31 and a pole base plate 32. The pole body 31 passes through the cover plate 10 and connects to the pole base plate 32. By welding the two side edges of the pole base plate 32 to the current collecting plate 40, the current collecting plate 40 and the pole assembly 30 have greater current flow capacity, enabling high-rate charge and discharge for the battery 200 and improving the fast-charging performance of the battery 200. At the same time, the welded connection optimizes the current path, reduces heat accumulation caused by resistance, prevents battery overheating, and improves battery safety. The welded connection between the pole base plate 32 and the current collecting plate 40 also enhances the overall structural stability of the battery 200, reduces the risk of loose electrical connections due to vibration or impact, and significantly enhances the stability and conductivity of the current transmission path. This structural design effectively improves the current flow capacity of the battery 200, enabling high-rate charge and discharge. At the same time, the battery 200 can operate stably under high current conditions, giving the battery 200 higher current transmission efficiency and reliability.

[0051] As an optional embodiment, the cover plate structure 100 is a negative electrode cover plate of the battery 200 , and the cover plate 10 is welded to the shell 201 .

[0052] As an optional embodiment, the cover plate 10 is provided with a pole mounting hole 12 , and the pole body 31 passes through the pole mounting hole 12 and is welded to the pole bottom plate 32 .

[0053] The pole mounting hole 12 provides a clear path and positioning point for the pole body 31, ensuring the precise alignment of the pole body 31 with other components and improving assembly accuracy. Through the connection of the pole mounting hole 12, the pole body 31 forms a stable mechanical connection with the pole base plate 32, enhancing the strength and stability of the overall structure. The design of the pole mounting hole 12 enables the pole body 31 to be quickly inserted and positioned, simplifying the assembly process and reducing assembly time and complexity. The pole body 31 is connected to the pole base plate 32 through the pole mounting hole 12, forming an effective force conduction path, ensuring that mechanical stress and current can be effectively transmitted, reducing stress concentration and resistance loss. The pole mounting hole 12 provides a physical limitation for the pole body 31, preventing component displacement due to vibration or impact during use, and ensuring the reliability of electrical and mechanical connections.

[0054] As an optional embodiment, the collecting plate 40 is circular, the arc length of the welding area between the pole bottom plate 32 and the collecting plate 40 is L1, and the circumference of the collecting plate 40 is L3, wherein L1 and L3 satisfy: 0.2L3≤L1≤0.7L3.

[0055] Since both sides of the pole bottom plate 32 are welded to the current collecting plate 40 respectively, L1 represents the sum of arc lengths of welding areas between both sides of the pole bottom plate 32 and the current collecting plate 40 .

[0056] By setting L1 between 20% and 70% of the circumference of the collecting plate 40, it is ensured that the welding area has sufficient length to provide sufficient flow area and necessary mechanical and electrical connection strength, while avoiding material waste and potential thermal damage caused by excessive welding.

[0057] Arc lengths ranging from 20% to 70% allow for a balance between weld strength and structural flexibility. Shorter weld lengths (approximately 0.2L3) provide greater structural flexibility; 0.2L3 ≤ L1 prevents insufficient flow capacity between the collector plate 40 and the pole base plate 32. Longer weld lengths (approximately 0.7L3) enhance connection stability. By limiting the arc length in the weld area, heat concentration generated during welding is reduced, minimizing thermal impact on the collector plate 40 and other components, thereby improving overall thermal management.

[0058] Furthermore, a reasonable weld length range helps reduce the use of welding materials and energy consumption, thereby reducing production costs while maintaining the necessary joint strength. Proper weld length design can more evenly distribute mechanical and thermal stresses, reducing the impact of stress concentration on structural integrity.

[0059] As an optional embodiment, along the thickness direction of the pole bottom plate 32 , the weld width of the welding area between the pole bottom plate 32 and the current collecting plate 40 is w, where w satisfies: 0.4 mm≤w≤1.2 mm.

[0060] The weld width design ensures sufficient strength in the weld area to withstand mechanical and thermal stresses, guaranteeing a reliable and durable connection. By limiting the weld width to less than 1.2 mm, the heat-affected zone (HAZ) is reduced, mitigating the risk of material degradation due to overheating, such as with the lower baffle 20, while maintaining the material's mechanical and electrical properties. Appropriate weld width design reduces welding material usage, lowering production costs and minimizing potential material waste during the welding process. Controlling the weld width helps form a uniform and continuous weld, minimizing weld defects such as porosity and cracks, and improving weld quality.

[0061] like Figure 4 As shown in FIG. 1 , as an optional embodiment, the current collecting plate 40 includes a middle region 41, a connecting region 42, and a welding region 43. The connecting region 42 connects the middle region 41 and the welding region 43. The two side edges of the pole base plate 32 are welded to the welding region 43. Along the thickness direction of the current collecting plate 40, the plane where the welding region 43 is located is offset from the plane where the middle region 41 is located.

[0062] The current collecting plate 40 is divided into a central area 41, a connecting area 42, and a welding area 43, allowing current to flow more efficiently through each area. In particular, the design of welding the two side edges of the terminal base plate 32 to the welding area 43 provides a more stable and low-resistance current transmission path, significantly improving the current handling capacity of the battery 200.

[0063] Welding zone 43 is specifically designed for welding to the pole base plate 32, providing a specially designed area for achieving a secure mechanical and electrical connection, enhancing the strength and stability of the overall structure. By establishing a dedicated welding zone 43 on the collector plate 40, the welding process can be better controlled, welding quality can be improved, and the occurrence of welding defects such as porosity and cracks can be reduced. The design of welding zone 43 helps concentrate and control welding heat, reducing the thermal impact on the collector plate 40 and other parts of the pole base plate 32, thereby protecting the integrity and performance of the material. The presence of welding zone 43 helps evenly distribute the stress generated during welding, reducing stress concentration and lowering the risk of structural failure.

[0064] The planar offset design of the welding area 43 and the middle area 41 in the thickness direction helps improve heat distribution and dissipation, preventing melting of the battery cell 202 during welding. By optimizing thermal management performance, the risk of local overheating is reduced, and the safety and service life of the battery 200 are improved.

[0065] The planar offset design of the welding area 43 and the intermediate area 41 in the thickness direction also increases the structural strength of the current collecting plate 40. This offset structure helps absorb and disperse mechanical stress, reducing the risk of weld damage caused by vibration or impact, and enhancing the overall mechanical stability of the battery 200. By welding the edge of the terminal base plate 32 to the specially designed welding area 43, the weld is precise and secure. The offset planar design reduces potential stress concentration during welding, improving weld quality and reliability.

[0066] like Figure 5 and Figure 6 As shown, as an optional embodiment, the height of the welding area 43 above the middle area 41 is h, and h satisfies: 0.5 mm ≤ h ≤ 3 mm.

[0067] Wherein, h≤3mm avoids insufficient utilization of the structural height and improves the energy density of the battery cell 202. 0.5mm≤h avoids too small a misalignment space, which may cause the battery cell 202 to melt during welding.

[0068] As an optional embodiment, the welding area 43 is provided around the outer circumference of the current collecting plate 40 , and the welding area 43 can abut against the pole bottom plate 32 , and welding is performed on the abutting surface.

[0069] Since the welding position between the pole bottom plate 32 and the current collecting plate 40 is on the outer periphery of the current collecting plate 40 , the welding is visible and the welding reliability is high.

[0070] As an optional embodiment, a current collecting plate positioning portion 413 is provided on a side of the current collecting plate 40 facing the pole bottom plate 32 , and a current collecting plate positioning piece 322 that cooperates with the current collecting plate positioning portion 413 is provided on the pole bottom plate 32 .

[0071] The cooperation between the collecting plate positioning portion 413 and the collecting plate positioning member 322 ensures the precise alignment between the collecting plate 40 and the pole base plate 32, helps to reduce errors during the assembly process, improves the assembly accuracy and consistency of the components, simplifies the installation process of the collecting plate 40 and the pole base plate 32, reduces the need for manual adjustment, and thus improves assembly efficiency and production speed.

[0072] The design of the collector plate positioning portion 413 and the collector plate positioning member 322 provides additional mechanical fixing points, enhancing the stability between the collector plate 40 and the pole base plate 32. This prevents relative movement caused by vibration or impact during use, reducing stress concentration and potential damage at the weld joint. Furthermore, the coordination between the collector plate positioning portion 413 and the collector plate positioning member 322 effectively prevents misalignment of the collector plate 40 during welding or use, ensuring a reliable and consistent electrical connection. Precise positioning ensures optimal contact between the weld areas, thereby improving the efficiency and stability of current transmission.

[0073] As an optional implementation, the collecting plate positioning member 322 is a hole opened on the pole bottom plate 32 .

[0074] As an optional implementation, the collecting plate positioning portion 413 is provided on the middle area 41 , thereby improving the compactness of the collecting plate 40 structure.

[0075] As an optional embodiment, the current collecting plate positioning portion 413 is hollow, and two current collecting plate positioning portions 413 are symmetrically provided along the axis of the middle area 41 .

[0076] The hollow design of the current collecting plate positioning portion 413 effectively reduces the overall weight of the current collecting plate 40 , helps to improve the energy density of the battery 200 , and makes it more suitable for weight-sensitive application scenarios.

[0077] The symmetrically arranged collecting plate positioning portions 413 improve the structural symmetry of the collecting plate 40 , enhance its balance during assembly, help ensure the stability of the collecting plate 40 during assembly, and reduce stress concentration and potential mechanical deformation caused by asymmetry.

[0078] The hollow structure of the collecting plate positioning portion 413 also helps to improve heat dissipation, reduce heat accumulation on the collecting plate 40, help improve the thermal management performance of the battery 200, reduce the risk of overheating, and enhance the safety and service life of the battery.

[0079] The hollow collecting plate positioning portion 413 provides a precise positioning function, ensuring the accurate alignment of the collecting plate 40 during assembly. The symmetrical design further enhances assembly stability, reduces assembly errors, and improves the reliability of the overall structure.

[0080] As an optional embodiment, the current collecting plate 40 is provided with a weight-reducing hole 414. The weight-reducing hole 414 is a through hole that reduces mass and facilitates the infiltration of the electrolyte in the battery 200.

[0081] Lightening holes 414 directly reduce material usage in the collector plate 40, thereby reducing overall assembly weight and improving energy efficiency and performance. This reduction in material usage reduces production costs, as well as shipping and installation costs, especially in large-scale production and transportation. Furthermore, lightening holes 414 increase the surface area of ​​the collector plate 40, facilitating heat dissipation and improving the assembly's heat dissipation performance, thereby enhancing the system's thermal stability.

[0082] The design of the lightening holes 414 can also change the vibration characteristics of the collecting plate 40, reduce resonance, and improve the stability of the system in dynamic environments. Properly designed lightening holes 414 can help optimize stress distribution, reduce stress concentration, and reduce the risk of material fatigue and failure.

[0083] As an optional embodiment, the pole base plate 32 is provided with a fixing hole 323. The pole body 31 is inserted into the fixing hole 323 and is welded to the pole base plate 32 through the fixing hole 323. The pole base plate 32 is provided with a protrusion 325 on the side facing the cover plate 10, and the protrusion 325 is arranged around the fixing hole 323.

[0084] By providing a protrusion 325 on the side of the pole base plate 32 facing the cover plate 10 and surrounding the protrusion 325 in the fixing hole 323, the fixing hole 323 provides a clear positioning point for the pole body 31, ensuring precise alignment of the pole body 31 with the pole base plate 32 and improving assembly accuracy. The pole body 31 is connected to the pole base plate 32 through the fixing hole 323, forming a stable mechanical and electrical connection, enhancing the strength and stability of the overall structure.

[0085] The fixing holes 323 are used to weld the pole base plate 32 to the pole body 31, increasing the thickness and contact area of ​​the weld area. This design improves weld strength and robustness, ensuring a reliable connection between the pole body 31 and the pole base plate 32, and reducing the risk of weld damage due to mechanical stress. The design of the protrusion 325 places the fixing holes 323 in a more centralized position, helping to optimize the current transmission path. The enhanced weld connection ensures efficient current transmission, reduces resistance, and improves the current handling capacity and overall electrical performance of the battery 200.

[0086] The protrusion 325 increases the local thickness at the fixing hole 323, improving the penetration of the weld between the terminal base plate 32 and the terminal body 31, enhancing welding reliability and the sealing of the welder. It also provides additional surface area, facilitating heat dissipation and management, reducing heat accumulation in the weld area, lowering the risk of overheating, and improving the safety and service life of the battery 200. The presence of the protrusion 325 increases the structural strength of the terminal base plate 32, providing additional mechanical support to help resist external vibration and impact, and ensuring the reliability of the battery 200 under various operating conditions.

[0087] As an optional embodiment, along the thickness direction of the pole bottom plate 32 , the height of the protrusion 325 is h2 , the thickness of the pole bottom plate 32 is H, and h2 and H satisfy: 0.4H≤h2≤3H.

[0088] By setting the height h2 of the protrusion 325 within the range of 0.4H-3H, sufficient thickness and strength of the welding area are ensured. This optimized design provides a balance so that the welded connection has sufficient mechanical strength without causing structural instability of the pole base plate 32 due to a protrusion 325 that is too high or too low.

[0089] Appropriate heights of the protrusions 325 , such as 0.4H, H, 1.5H, 2H, 2.5H, and 3H, help optimize the current transmission path, reduce resistance, improve current transmission efficiency, and enhance the current flow capacity of the battery 200 .

[0090] The appropriate height of the protrusion 325 provides additional surface area, which helps to effectively dissipate heat. By controlling the range of h2, thermal management performance is optimized, reducing the risk of overheating and improving the safety and service life of the battery.

[0091] In the range of 0.4H-3H, the protrusion 325 provides additional mechanical support, enhances the overall structural stability of the pole bottom plate 32, helps to resist external vibration and impact, and ensures the reliability of the battery 200 under various working conditions.

[0092] As an optional embodiment, the pole body 31 is made of composite material.

[0093] As an optional embodiment, the terminal body 31 is a copper-aluminum composite structure. The material facing the outside of the battery 200 is aluminum, and the material facing the inside of the battery 200 is copper, thereby optimizing the performance and cost of the battery 200.

[0094] Copper has excellent electrical conductivity, while aluminum has low resistivity. By combining the two, the terminal body 31 achieves efficient current transmission. This composite structure effectively reduces the internal resistance of the battery 200, improving its overall electrical performance and current handling capacity. The copper-aluminum composite structure combines the advantages of both metals, providing excellent mechanical strength and toughness. This enhanced mechanical performance helps resist external vibration and impact, ensuring the reliability of the battery 200 under various operating conditions.

[0095] Aluminum has a lower density, and compared to pure copper structures, the copper-aluminum composite structure can significantly reduce the weight of the pole, helping to increase the energy density of the battery 200, making it more suitable for weight-sensitive applications. The cost of aluminum is generally lower than that of copper, so the use of a copper-aluminum composite structure can effectively reduce material costs and help improve the market competitiveness of the product. Both copper and aluminum have high thermal conductivity, and the composite structure can effectively dissipate heat and reduce heat accumulation. This design helps to improve the thermal management performance of the battery 200, reduce the risk of overheating, and increase the safety and service life of the battery 200.

[0096] As an optional embodiment, a convex bump 411 is provided on the side of the collecting plate 40 facing the pole bottom plate 32 . A flow gap 412 is provided on the convex bump 411 .

[0097] The pole body 31 contacts the convex bump 411 on the current collecting plate 40 through the fixing hole 323. The electrolyte can enter the middle of the battery cell 202 through the flow gap 412. The convex bump 411 contacts the pole body 31, which can better support the internal battery cell 202.

[0098] By providing electrolyte flow slits 412 on the convex bumps 411, the electrolyte can be more evenly distributed throughout the center of the battery cell 202, ensuring effective penetration and distribution of the electrolyte, thereby improving the electrochemical reaction efficiency and overall performance of the battery 200. The uniform distribution of the electrolyte helps reduce local electrode overreaction and aging, thereby extending the service life of the battery 200. By optimizing the electrolyte flow path, the performance of the battery 200 is significantly improved. The electrolyte flow slits 412 not only facilitate electrolyte distribution but also promote heat conduction and dissipation, helping to reduce the risk of local overheating, improving the thermal management performance of the battery 200, and enhancing its safety and service life.

[0099] As an optional implementation, the pole bottom plate 32 is provided with a recessed groove 324 that cooperates with the convex bump 411 .

[0100] The mating design of the bump 411 and the recessed groove 324 provides a natural mechanical locking effect, ensuring a tight connection between the collector plate 40 and the pole base plate 32. This structure enhances overall mechanical stability and reduces the risk of component loosening due to vibration or impact. The mating of the bump 411 and the recessed groove 324 provides a self-aligning function, simplifying the assembly process, reducing the need for complex tooling and fixtures, and improving production efficiency and assembly accuracy.

[0101] As an optional embodiment, the fixing hole 323 communicates with the countersunk groove 324. Along the thickness direction of the pole base plate 32, the height difference between the end face of the pole body 31 and the bottom face of the countersunk groove 324 is less than or equal to 0.5 mm. The end face of the pole body 31 is welded to the bottom face of the countersunk groove 324 of the pole base plate 32.

[0102] The countersunk groove 324 provides an additional positioning and support structure, so that the pole body 31 can be positioned more stably during the assembly process, reducing assembly errors and improving the stability of the overall structure. By maintaining a height difference of less than or equal to 0.5 mm between the end face of the pole body 31 and the bottom surface of the countersunk groove 324, the weld thickness is accommodated when the pole body 31 is welded to the pole base plate 32, avoiding the protrusion of the weld mark height after welding, thereby improving the integration of the component, making the overall structure compact, improving the energy density, and ensuring close mechanical contact, enhancing the connection strength and stability. The design of the countersunk groove 324 helps to evenly distribute mechanical stress, reduce stress concentration, and reduce the risk of material fatigue and failure. The presence of the countersunk groove 324 can increase the surface area of ​​the component, help dissipate heat, improve the heat dissipation performance of the component, and improve the thermal stability of the system. The countersunk groove 324 provides a physical limit for the pole body 31, preventing the component from shifting due to vibration or impact during use, and ensuring the reliability of electrical and mechanical connections.

[0103] As an optional implementation, the convex bump 411 is provided on the middle area 41 , thereby improving the compactness of the structure of the collecting plate 40 .

[0104] like Figure 7 and Figure 8 As shown, as an optional embodiment, the cover plate structure 100 further includes a lower partition 20. The lower partition 20 is disposed between the cover plate 10 and the pole bottom plate 32. An abutment post 23 is provided on the side of the lower partition 20 facing the current collecting plate 40. The abutment post 23 abuts against the current collecting plate 40.

[0105] The direct contact between the abutment column 23 and the collecting plate 40 provides an additional support point, supports the collecting plate 40, enhances the stability of the entire cover structure 100, reduces the relative movement between components, and avoids shaking of the battery cells 202 during use. The abutment column 23 effectively transmits the force from the collecting plate 40 to the lower partition 20, helps disperse and evenly distribute stress, and reduces the potential damage to the structure caused by local stress concentration. The design of the abutment column 23 can absorb and alleviate vibrations and impacts from the collecting plate 40 to a certain extent, protect other components from damage, and improve the durability of the overall system. In the battery 200, the collecting plate 40 is used to collect and distribute current, which will generate a large amount of heat. The abutment between the abutment column 23 and the collecting plate 40 can promote the conduction and dissipation of heat to the lower partition 20 to a certain extent, thereby optimizing thermal management performance.

[0106] At the same time, the abutment posts 23 also help to position the collecting plate 40 during the installation process, ensuring that it is correctly aligned with other components, simplifying the assembly process and improving assembly accuracy.

[0107] As an optional embodiment, the abutting post 23 abuts against the middle area 41 of the collecting plate 40 .

[0108] As an optional embodiment, a cover plate positioning portion 21 is provided on a side of the lower partition 20 facing the cover plate 10 , and a pole positioning portion 22 is provided on a side of the lower partition 20 facing the pole bottom plate 32 .

[0109] The cover plate 10 is provided with a cover plate positioning hole 11 that cooperates with the cover plate positioning portion 21. The cover plate positioning portion 21 cooperates with the cover plate positioning hole 11 to position and securely connect the cover plate 10 to the lower partition plate 20.

[0110] The pole bottom plate 32 is provided with a pole positioning hole 321 that cooperates with the pole positioning portion 22. The pole positioning portion 22 cooperates with the pole positioning hole 321 to position and securely connect the pole bottom plate 32 to the lower partition plate 20.

[0111] By providing a cover plate positioning portion 21 and a pole positioning portion 22 on the lower partition 20, and cooperating with the cover plate positioning hole 11 and the pole positioning hole 321 respectively, the position of the cover plate 10 and the pole assembly 30 can be effectively fixed, thereby enhancing the fixed connection strength of the pole assembly 30, the lower partition 20 and the cover plate 10, and improving the stability of the entire cover plate structure 100, preventing the assembly from loosening or shifting during high-rate charging and discharging, and improving the mechanical strength and thermal stability of the battery 200, so that the battery 200 can use high-rate poles for charging and discharging, thereby improving the safety and service life of the battery 200, and enabling the cylindrical battery structure to have fast charging performance. The cover plate positioning portion 21 and the pole positioning portion 22 are provided on the lower partition 20, saving space, and the force point is on the positioning portion, the structural strength is high, and it can better resist torsion.

[0112] The presence of the lower baffle 20 can, to a certain extent, absorb and mitigate the effects of external shock or vibration on the cover plate 10 and the pole assembly 30, thereby extending the product's service life. Furthermore, the design of the positioning portion and positioning hole ensures accurate alignment of the cover plate 10 and the pole assembly 30 during installation, improving installation accuracy and reducing the risk of failure due to improper installation. It also allows the cover plate 10, the pole assembly 30, and the lower baffle 20 to be tightly integrated, reducing gaps between components, resulting in a compact structure, increased energy density, and reduced impact of the external environment on internal components. Because the components are clearly positioned, disassembly and reassembly become simpler and faster, facilitating subsequent maintenance and inspection.

[0113] As an optional embodiment, the surface of the lower partition plate 20 facing the cover plate 10 is in contact with the surface of the cover plate 10 facing the lower partition plate 20 .

[0114] By tightly fitting the lower baffle 20 and the cover plate 10, they form an integrated structural unit, increasing the rigidity and stability of the overall assembly and reducing the risk of deformation under mechanical load. At the same time, the overall assembly is compact and has improved energy density. The tightly fitting surface effectively prevents the ingress of dust, moisture, and other contaminants, improving the system's sealing performance and protecting the safety and functionality of internal components. At the same time, the fitted surface provides good thermal contact, facilitating effective heat transfer between the two plates, improving the system's heat dissipation performance, and enhancing thermal stability. Furthermore, the fitted design simplifies the assembly process, reduces the need for additional fasteners, and improves assembly efficiency and reliability.

[0115] As an optional embodiment, the surface of the lower partition 20 facing the pole bottom plate 32 is in contact with the surface of the pole bottom plate 32 facing the lower partition 20 .

[0116] By tightly fitting the lower partition 20 and the pole bottom plate 32 to form an integrated structural unit, the rigidity and stability of the overall assembly are increased, the risk of deformation under mechanical load is reduced, and the overall assembly structure is compact, which improves energy density. The tightly fitting surface can effectively prevent the ingress of dust, moisture and other contaminants, improve the sealing performance of the system, and protect the safety and functionality of internal components. At the same time, the fitting surface provides good thermal contact, which helps to effectively conduct heat between the two plates, improve the heat dissipation performance of the system, and enhance thermal stability. At the same time, the fitting design simplifies the assembly process, reduces the need for additional fixings, and improves assembly efficiency and reliability.

[0117] As an optional embodiment, along the thickness direction of the cover plate 10 , the depth of the cover plate positioning hole 11 is h3 , and the thickness of the cover plate 10 is H1 , wherein h3 and H1 satisfy: 0.5 mm ≤ h3 ≤ 0.8 H1 .

[0118] That is, the cover plate positioning hole 11 is a countersunk hole. By limiting the depth of the cover plate positioning hole 11 to no more than 80% of the cover plate thickness, the structural integrity of the cover plate 10 is ensured, and the strength of the cover plate 10 is avoided from being weakened due to excessive hole depth. The appropriate hole depth (0.5mm≤h3) provides sufficient positioning depth to ensure the precise alignment of the cover plate 10 and the lower partition 20 during the assembly process, ensuring positioning reliability, while also having anti-torsion capability, thereby improving assembly accuracy and stability. The hole depth design not only provides sufficient positioning function but also retains sufficient thickness of the cover plate 10, thereby enhancing the stability and anti-deformation ability of the overall structure. By limiting the hole depth (h3≤0.8H1), excessive penetration during processing is prevented, the structural strength of the cover plate 10 at this point is ensured, and the integrity and function of the cover plate 10 are protected. The appropriate hole depth design can also reduce the impact on the heat conduction path of the cover plate 10, helping to maintain good thermal management performance.

[0119] As an optional embodiment, along the thickness direction of the cover plate 10 , the height of the cover plate positioning portion 21 is h4 , wherein h3 and h4 satisfy: 0.6h3≤h4≤h3.

[0120] By ensuring that the height h4 of the cover plate positioning portion 21 is between 0.6h3 and h3, sufficient contact area and depth are provided, allowing the cover plate 10 and the lower partition 20 to be stably positioned during assembly, reducing assembly errors. The height of the cover plate positioning portion 21 is designed to not exceed the depth of the positioning hole 11 (h4≤h3), ensuring the strength and stability of the structure and avoiding structural weakness caused by the cover plate positioning portion 21 being too high. The appropriate height h4 (0.6h3≤h4) ensures a tight fit of the cover plate positioning portion 21 within the positioning hole 11, preventing loosening due to vibration or impact during use and improving the reliability of the connection. This height design allows the positioning portion 11 to be quickly inserted and positioned, simplifying the assembly process and reducing assembly time and complexity.

[0121] As an optional embodiment, two cover plate positioning parts 21 are provided on the side of the lower partition 20 facing the cover plate 10 , and two pole positioning parts 22 are provided on the side of the lower partition 20 facing the pole bottom plate 32 , thereby improving positioning accuracy.

[0122] As an optional implementation, the cover plate positioning portion 21 and the pole positioning portion 22 may be annular or columnar protrusions.

[0123] As an optional embodiment, along the thickness direction of the lower partition plate 20 , the axis of the cover plate positioning portion 21 coincides with the axis of the pole positioning portion 22 .

[0124] The design of coinciding axes creates a more symmetrical structure between the cover plate positioning portion 21 and the pole positioning portion 22, which helps evenly distribute stress, reduces stress concentration caused by asymmetric designs, and improves the stability and durability of the overall lower baffle 20 structure. This design also more effectively utilizes the thickness of the lower baffle 20, reducing unnecessary material waste while ensuring a tight fit between the various components, resulting in a compact structure and increased energy density. It also ensures that the cover plate 10 and pole assembly 30 automatically align during installation, reducing the need for manual adjustment and improving installation accuracy and efficiency.

[0125] Since the symmetrical structure is easier to process and assemble, the design of overlapping axes can also simplify the mold design and manufacturing process of the lower partition 20, thereby reducing production complexity and cost.

[0126] As an optional implementation, a hole 211 is provided in the middle of the cover plate positioning portion 21 .

[0127] By providing a channel 211 in the center of the cover plate positioning portion 21, the presence of channel 211 effectively reduces material usage, thereby reducing the overall weight of the lower partition 20. This also lowers production costs while maintaining structural integrity and functionality. Furthermore, the design of channel 211 can be used to guide tools or fasteners during installation, simplifying installation steps and improving assembly efficiency.

[0128] As an optional embodiment, the pole positioning portion 22 includes at least two arcuate portions 221 and a pole positioning post 222. The centers of the at least two arcuate portions 221 coincide and have the same radius, thereby forming a pole positioning portion 22 with a circular outer circumference. The arcuate portions 221 mate with the pole positioning holes 321 to position the lower partition 20 and the pole base plate 32. The pole positioning post 222 is disposed between the at least two arcuate portions 221. The pole positioning post 222 serves to enhance the overall structural strength of the pole positioning portion 22.

[0129] The cooperation between the arc portion 221 and the pole positioning post 222 enables the pole base plate 32 to be quickly aligned and fixed during installation, thereby reducing installation time and complexity and improving assembly efficiency.

[0130] The cooperation of multiple arc-shaped portions 221 with the pole positioning hole 321 provides a multi-point contact positioning method, which can better limit the radial movement of the pole base plate 32 and improve the positioning accuracy and stability. The presence of at least two arc-shaped portions 221 can effectively prevent the pole base plate 32 from rotating during installation or use, ensuring that the pole base plate 32 always remains in the correct position and direction. The design of the arc-shaped portion 221 helps to evenly distribute external forces around the pole positioning hole 321. The cooperation of the arc-shaped portion 221 with the pole positioning hole 321 provides an effective anti-torsion function, preventing the pole base plate 32 from twisting due to external forces during use, reducing material fatigue or damage that may be caused by single-point force, and improving the durability of the overall structure.

[0131] The pole locating post 222 is located between at least two of the arcuate portions 221, providing additional support and fixing points, further enhancing the stability of the pole and preventing axial movement. As a columnar structure, the pole locating post 222 enhances the overall structural strength. It not only provides additional support for the pole base plate 32 but also enhances the pole assembly 30's ability to resist deformation when subjected to external pressure.

[0132] As an optional embodiment, the pole positioning portion 22 includes two arc-shaped portions 221 . The two arc-shaped portions 221 are symmetrically arranged, and the pole positioning post 222 is arranged between the two arc-shaped portions 221 .

[0133] As an optional embodiment, a thinning groove 24 is provided on the side of the lower separator 20 facing the current collecting plate 40. The thinning groove 24 is opposite the edge of the pole bottom plate 32. In other words, the thinning groove 24 is provided at the edge of the lower separator 20 in the projection area where the pole bottom plate 32 and the current collecting plate 40 are welded.

[0134] The design of the thinning groove 24 helps alleviate thermal stress generated during welding. By providing the thinning groove 24 on the lower separator 20, the high temperatures generated during welding between the pole base plate 32 and the collector plate 40, which could melt the lower separator 20, are prevented. This reduces material deformation and stress concentration in the lower separator 20 caused by thermal expansion and contraction. The thinning groove 24 also promotes heat dissipation, helps manage the temperature in the weld area, and prevents overheating from affecting the material properties of the lower separator 20, thereby improving the thermal stability of the entire system. By providing the thinning groove 24 near the weld area, material flow during welding can be better controlled, improving weld quality and reducing weld defects.

[0135] The presence of the thinning groove 24 reduces the amount of material used, thereby reducing the overall weight of the component, helping to improve the energy efficiency of the system and reduce transportation costs. The design of the thinning groove 24 provides a certain degree of flexibility to the structure, allowing for slight deformation under thermal cycles or mechanical loads, thereby reducing material fatigue and extending component life.

[0136] As an optional embodiment, the arc length of the thinning groove 24 is L2, and the arc length of the welding area between the pole bottom plate 32 and the current collecting plate 40 is L1. L1 and L2 satisfy: L1<L2.

[0137] The thinning grooves 24 are arranged opposite to the welding area, and are also two in number. Therefore, L2 represents the sum of the arc lengths of the thinning grooves 24 on both sides.

[0138] In the present application, L1<L2 means that the arc length of the welding area on each side is smaller than the arc length of the thinning groove 24 on the corresponding side.

[0139] By designing L1 < L2, the arc length of the thinning groove 24 is greater than the arc length of the weld area, providing a larger stress buffer around the weld area, helping to evenly distribute and alleviate the thermal and mechanical stresses generated during the welding process. The larger arc length of the thinning groove 24 allows for better control of thermal expansion effects during welding and use, reducing deformation and material fatigue caused by uneven thermal expansion. At the same time, the larger arc length of the thinning groove 24 provides a certain degree of structural flexibility, allowing for minimal deformation under mechanical loads or thermal cycles, thereby reducing material fatigue and extending component life.

[0140] By limiting the arc length of the welding area, the welding process can be better focused, the welding quality can be improved, and welding defects can be reduced. At the same time, the design of the thinning groove 24 helps to control the material flow during the welding process.

[0141] As an optional implementation, 2mm≤L2-L1.

[0142] As an optional embodiment, along the thickness direction of the lower partition plate 20 , the depth of the thinning groove 24 is h1 , wherein h1 satisfies: h1 > 0.5 mm.

[0143] By providing the thinning groove 24 and ensuring its depth is greater than 0.5 mm, the material usage of the lower separator 20 can be effectively reduced, thereby reducing the weight of the entire assembly, improving the system's energy efficiency, lowering production costs, and reducing resource consumption. The thinning groove 24 increases the surface area of ​​the lower separator 20, facilitating heat dissipation and improving the assembly's heat dissipation performance. It also prevents deformation of the lower separator 20 caused by the high temperatures generated by the welded connection between the pole base plate 32 and the collector plate 40, thereby improving the system's thermal stability.

[0144] As an optional embodiment, the lower partition 20 is provided with a pole hole 25, and the pole body 31 passes through the pole hole 25. A connecting groove 26 is provided on the side of the lower partition 20 facing the pole bottom plate 32. The connecting groove 26 is connected to the pole hole 25 and extends to the edge of the lower partition 20. The connecting groove 26 passes through the pole positioning portion 22.

[0145] The design of the connecting groove 26 allows the lower portion of the pole hole 25 to communicate with the outside through the connecting groove 26, thereby facilitating the discharge of gas during assembly, allowing the pole body 31 to be more easily inserted and removed, and simplifying the assembly and maintenance process, especially in applications that require frequent assembly and disassembly. The connecting groove 26 provides a path for the electrolyte to flow between the pole hole 25 and the edge of the lower partition 20, which is conducive to electrolyte infiltration. In addition, since the electrolyte can flow between the lower partition 20 and the pole bottom plate 32 through the connecting groove 26, the contact seal between the lower partition 20 and the pole bottom plate 32 due to abutment is avoided, which may cause false detection of the sealing ring 60 during the sealing test.

[0146] By removing unnecessary material, the connecting groove 26 can also help reduce the weight of the lower partition 20, thereby improving the energy efficiency of the entire system. The connecting groove 26 increases the surface area of ​​the components, helps to dissipate heat, improves the heat dissipation performance of the system, and enhances thermal stability.

[0147] As an optional embodiment, one end of the communication groove 26 is connected to the pole hole 25 , and the other end is connected to the thinning groove 24 .

[0148] The flow gap 412 allows the electrolyte between the pole bottom plate 32 and the current collecting plate 40 to enter the middle of the battery cell 202 through the flow gap 412, even if the electrolyte flows in the axial direction of the battery cell through the flow gap 412. The connecting groove 26 allows the electrolyte on the inner wall of the housing 201 to flow through the connecting groove 26 into the space between the pole bottom plate 32 and the lower partition 20, even if the electrolyte flows in the radial direction of the battery cell 202 through the connecting groove 26. The two functions work together to increase the flow path of the electrolyte in the battery 200, thereby facilitating the electrolyte's infiltration into the battery cell 202 and improving the overall performance and service life of the battery 200.

[0149] As an optional implementation, along the thickness direction of the pole bottom plate 32 , the pole positioning hole 321 coincides with the axis of the collecting plate positioning member 322 .

[0150] The design of overlapping axes makes the pole base plate 32 more symmetrical in structure, helps to evenly distribute stress, reduce stress concentration problems caused by asymmetric design, and improve the stability and durability of the overall structure of the pole base plate 32. At the same time, this design can more effectively utilize the thickness space of the pole base plate 32, reduce unnecessary material waste, and ensure close fit between the components, compact structure, and improved energy density. It can also ensure that the pole base plate 32, the collecting plate 40, and the lower partition 20 can be automatically aligned during installation, improving the assembly accuracy of the components, reducing the need for manual adjustment, and improving installation accuracy and efficiency. In the assembly of multiple components, the coincidence of axes can reduce assembly inaccuracies caused by cumulative errors and ensure the accuracy and consistency of the overall structure.

[0151] Since the symmetrical structure is easier to process and assemble, the design of coincident axes can also simplify the design and manufacturing process of the pole base plate 32, thereby reducing production complexity and cost.

[0152] As an optional implementation, the diameter of the pole positioning hole 321 is larger than the diameter of the collecting plate positioning member 322 .

[0153] The larger pole locating holes 321 provide installation flexibility, allowing fine-tuning during assembly to ensure proper alignment between the lower partition 20 and the pole base plate 32, compensating for manufacturing tolerances and assembly errors. The larger pole locating holes 321 make it easier to insert and position components during initial alignment, simplifying the assembly process and improving production efficiency. The larger diameter of the pole locating holes 321 better accommodates thermal expansion and contraction of the material due to temperature changes, preventing deformation or damage caused by thermal stress.

[0154] As an optional embodiment, the cover plate 10 is provided with a housing positioning step 13 , and the housing positioning step 13 is used to position the cover plate 10 on the housing 201 .

[0155] The positioning step 13 provides a clear positioning reference, so that the cover 10 can be accurately installed on the housing 201, ensuring alignment and fit between components and improving assembly accuracy. Through the mechanical support of the positioning step 13, the installation of the cover 10 on the housing 201 is more stable, reducing possible displacement or loosening during use, and improving the stability of the overall structure. The design of the positioning step 13 makes the assembly process more intuitive and simple, reduces the need for complex tools and processes, and improves assembly efficiency and consistency. The positioning step 13 helps to evenly distribute mechanical stress between the cover 10 and the housing 201, reducing stress concentration and reducing the risk of material fatigue and failure. The positioning step 13 can help ensure close contact between the cover 10 and the housing 201, enhance the sealing effect, and prevent the intrusion of dust, moisture and other contaminants.

[0156] As an optional embodiment, the cover plate 10 is provided with an explosion-proof valve 14 and a liquid injection hole 15 .

[0157] By integrating the explosion-proof valve 14 and the liquid injection hole 15 on the cover plate 10, the need for external safety devices and complex maintenance procedures is reduced, thereby reducing the overall cost of the system.

[0158] The explosion-proof valve 14 automatically opens when internal pressure is too high, releasing excess pressure and preventing explosions or other dangerous situations caused by overpressure, thereby improving system safety. The liquid injection port 15 provides a convenient interface for adding liquid electrolyte to the system during manufacturing or maintenance, simplifying the operation process and improving work efficiency.

[0159] As an optional embodiment, the pole body 31 includes a connected plate portion 311 and a column portion 312. The plate portion 311 is provided on the other side of the cover plate 10. The column portion 312 passes through the pole mounting hole 12 and the fixing hole 323 of the cover plate 10, abutting against the fixing hole 323, thereby connecting to the pole base plate 32. The outer wall of the column portion 312 is in contact with the wall of the fixing hole 323.

[0160] The plate portion 311 provides a planar support, which enhances the structural stability of the pole body 31 and reduces the risk of deformation under mechanical load. The column portion 312 passes through the pole mounting hole 12 and is connected to the pole base plate 32, forming an effective force conduction path to ensure that mechanical stress and current can be effectively transmitted. The design of the column portion 312 passing through the pole mounting hole 12 simplifies the installation process and ensures that the pole body 31 can be quickly and accurately aligned and connected with other components. The connection of the column portion 312 ensures reliable conduction of current from the pole body 31 to the pole base plate 32, reducing resistance and energy loss. The design of the plate portion 311 increases the surface area of ​​the pole body 31, which helps to dissipate heat and improve the heat dissipation performance of the component.

[0161] As an optional embodiment, the cover plate structure 100 further includes an upper partition plate 50 and a sealing ring 60. The upper partition plate 50 is disposed on the side of the cover plate 10 facing the pole body 31. The pole body 31 is penetrated by the upper partition plate 50. The sealing ring 60 is sleeved on the pole body 31 and abuts the upper partition plate 50. The sealing ring 60 is used to cooperate with the upper partition plate 50 to separate the pole body 31 from the cover plate 10. The upper partition plate 50 and the sealing ring 60 are disposed between the pole body 31 and the cover plate 10 to provide sealing and insulation.

[0162] The sealing ring 60 is mounted on the pole body 31 and abuts the upper partition 50, ensuring an effective seal between the pole body 31 and the cover plate 10, preventing dust, moisture and other contaminants from entering the internal components, and protecting the safety and functionality of the system. The cooperation between the sealing ring 60 and the upper partition 50 can effectively prevent the leakage of liquid or gas and ensure the normal operation of the system. The sealing ring 60 is usually made of elastic material and can provide a certain degree of shock absorption and buffering, reduce the impact of vibration on the system, and improve the stability and durability of the system. The sealing ring 60 and the upper partition 50 separate the pole body 31 from the cover plate 10, and can also prevent the pole assembly 30 from being electrically connected to the cover plate 10 and causing a short circuit.

[0163] The battery 200 provided in the embodiment of the present application includes a shell 201, a battery cell 202 and a cover plate structure 100. The battery cell 202 is arranged in the shell 201, and the cover plate structure 100 includes a cover plate 10, a pole assembly 30 and a current collecting plate 40. The cover plate 10 covers the shell 201. The pole assembly 30 includes a pole body 31 and a pole bottom plate 32. The pole bottom plate 32 is arranged on the side of the cover plate 10 close to the battery cell 202. The pole body 31 is arranged on the side of the cover plate 10 away from the battery cell 202, and is connected to the pole bottom plate 32 through the cover plate 10. The current collecting plate 40 is arranged on the side of the pole bottom plate 32 away from the cover plate 10. Along the length direction of the pole bottom plate 32, the two side edges of the pole bottom plate 32 are welded to the current collecting plate 40.

[0164] The terminal assembly 30 is designed to consist of a terminal body 31 and a terminal base plate 32. The terminal body 31 passes through the cover plate 10 and is connected to the terminal base plate 32. The terminal base plate 32 is welded to the current collector plate 40 at both edges. This welded connection optimizes the current path and reduces heat accumulation caused by resistance, thereby improving the thermal management of the battery 200, reducing energy loss during current transmission, improving the overall efficiency of the battery 200, preventing overheating, and enhancing the safety of the battery 200. The welded connection between the terminal base plate 32 and the current collector plate 40 also enhances the overall structural stability of the battery 200, reducing the risk of loosening electrical connections due to vibration or impact, and significantly improving the stability and conductivity of the current transmission path. This structural design effectively reduces the internal resistance of the battery 200, enabling stable operation under high current conditions, thereby improving the battery's overcurrent capability and enabling high-rate charge and discharge. The higher current transmission efficiency not only extends the battery's service life but also improves the device's operating time and reliability.

[0165] On the other hand, the present application provides an electronic device including the battery 200 described above.

[0166] Since the electronic device in this embodiment includes the battery 200 described in any of the above embodiments, the structure and beneficial effects of the electronic device including the battery 200 will not be further described in this embodiment.

[0167] It should be noted that references in this specification to "one embodiment," "an embodiment," "an exemplary embodiment," "some embodiments," and the like indicate that the described embodiment may include a particular feature, structure, or characteristic, but not necessarily every embodiment includes that particular feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Furthermore, when a particular feature, structure, or characteristic is described in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not.

[0168] Generally speaking, terms should be understood, at least in part, based on the context in which they are used. For example, as used herein, the term "one or more" can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense, depending at least in part on the context. Similarly, terms such as "a," "an," or "the" can also be understood to convey either singular or plural usage, depending at least in part on the context.

[0169] It should be readily understood that “on,” “above,” and “over” in this application should be interpreted in the broadest manner, such that “on” means not only “directly on something,” but also includes “on something” with intervening features or layers therebetween, and “above” or “over” includes not only the meaning of “above” or “over,” but also includes “above” or “over” with no intervening features or layers therebetween (i.e., directly on something).

[0170] Additionally, spatially relative terms, such as "below," "beneath," "beneath," "above," and the like, may be used herein for ease of description to describe the relationship of one element or feature to other elements or features as depicted in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The device may be otherwise oriented (rotated 90° or at other orientations), and the spatially relative descriptors used herein should be interpreted accordingly.

[0171] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery, characterized in that: include: case; a battery cell, the battery cell being disposed in the housing; The cover plate structure includes a cover plate, a pole assembly and a current collecting plate. The cover plate covers the shell and is provided with a pole mounting hole. The pole assembly includes a pole body and a pole bottom plate. The pole bottom plate is provided on a side of the cover plate close to the battery cell. The pole body is provided on a side of the cover plate away from the battery cell and is connected to the pole bottom plate through the pole mounting hole. The current collecting plate is provided on a side of the pole bottom plate away from the cover plate. Along the length direction of the pole bottom plate, the two side edges of the pole bottom plate are welded to the current collecting plate.

2. The battery according to claim 1, characterized in that The collecting plate is circular, the arc length of the welding area between the pole bottom plate and the collecting plate is L1, and the circumference of the collecting plate is L3, wherein L1 and L3 satisfy: 0.2L3≤L1≤0.7L3.

3. The battery according to claim 1, characterized in that The current collecting plate includes a middle area, a connecting area and a welding area. The connecting area connects the middle area and the welding area. The two side edges of the pole bottom plate are welded to the welding area. Along the thickness direction of the current collecting plate, the plane where the welding area is located and the plane where the middle area is located are staggered with each other.

4. The battery according to claim 3, characterized in that A current collecting disc positioning portion is provided on one side of the middle area facing the pole bottom plate, and a current collecting disc positioning piece matched with the current collecting disc positioning portion is provided on the pole bottom plate.

5. The battery according to claim 4, characterized in that The collecting plate positioning portion is hollow, and two collecting plate positioning portions are symmetrically arranged along the axis of the middle area.

6. The battery according to claim 1, characterized in that The pole bottom plate is provided with a fixing hole, the pole body is passed through the fixing hole and is welded to the pole bottom plate through the fixing hole, and a protrusion is provided on the side of the pole bottom plate facing the cover plate, and the protrusion is arranged around the fixing hole.

7. The battery according to claim 6, characterized in that Along the thickness direction of the pole bottom plate, the height of the protrusion is h2, the thickness of the pole bottom plate is H, and h2 and H satisfy: 0.4H≤h2≤3H.

8. The battery according to claim 1, characterized in that The pole body is a copper-aluminum composite structure.

9. The battery according to claim 1, characterized in that A convex bulge is provided on one side of the current collecting plate facing the pole bottom plate, and a flow gap is provided on the convex bulge.

10. The battery according to claim 1, characterized in that The cover plate structure further includes a lower partition plate, which is arranged between the cover plate and the pole bottom plate. An abutment column is provided on a side of the lower partition plate facing the current collecting plate, and the abutment column abuts against the current collecting plate.

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