battery

Abstract

This application relates to the field of battery technology, and more particularly to a battery comprising a casing; a battery cell disposed within the casing; and a cover structure comprising a cover plate, a terminal post assembly, and a lower separator. The terminal post assembly comprises a terminal post body and a terminal post base plate, with the base plate disposed on one side of the cover plate and the terminal post body disposed on the side of the cover plate opposite to the battery cell, passing through a terminal post mounting hole and connecting to the terminal post base plate. The lower separator is disposed between the cover plate and the terminal post base plate, with a cover plate positioning part on the side of the lower separator facing the cover plate and a terminal post positioning part on the side of the lower separator facing the terminal post base plate. The cover plate has a cover plate positioning element that mates with the cover plate positioning part, and the terminal post base plate has a terminal post positioning element that mates with the terminal post positioning part. By effectively fixing the positions of the cover plate and the terminal post assembly, the fixed connection strength between the terminal post, the lower separator, and the cover plate is enhanced, improving the stability of the entire structure, increasing the mechanical strength and thermal stability of the battery, thereby improving the safety and service life of the battery.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to a battery. Background Technology

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

[0003] However, traditional cylindrical batteries, while pursuing high energy density, often struggle to achieve fast charging performance. The connection method between the traditional battery cover and terminals can lead to overheating, poor contact, and insufficient mechanical strength under high-rate charge and discharge conditions, resulting in structural instability and affecting battery safety and performance. Utility Model Content

[0004] This application provides a battery for improving the structural stability of the battery, thereby improving the battery's high-rate charge-discharge performance and safety.

[0005] To achieve the above objectives, this application adopts the following technical solution:

[0006] On one hand, this application provides a battery, comprising:

[0007] case;

[0008] The battery cell is housed within the casing.

[0009] The cover plate structure includes a cover plate, pole post assembly, and lower partition plate.

[0010] The cover plate covers the housing and has pole mounting holes;

[0011] The electrode assembly includes an electrode body and an electrode base plate. The electrode base plate is located on the side of the cover plate close to the battery cell, and the electrode body is located on the side of the cover plate away from the battery cell, and passes through the electrode mounting hole and is connected to the electrode base plate.

[0012] The lower partition is located between the cover plate and the pole base plate. The side of the lower partition facing the cover plate is provided with a cover plate positioning part, and the side of the lower partition facing the pole base plate is provided with a pole positioning part. The cover plate is provided with a cover plate positioning component that cooperates with the cover plate positioning part, and the pole base plate is provided with a pole positioning component that cooperates with the pole positioning part.

[0013] As an optional implementation, the cover plate structure also includes a collector plate, which is located on the side of the pole post base plate away from the lower partition plate, and the two side edges of the pole post base plate are welded to the collector plate along the length direction of the pole post base plate.

[0014] As an optional implementation, the lower partition is provided with an abutment post on the side facing the collector plate, and the abutment post abuts against the collector plate.

[0015] As an optional implementation, the lower partition plate is provided with an electrode post hole, through which the electrode post body passes. The side of the lower partition plate facing the electrode post base plate is provided with a connecting groove, which communicates with the electrode post hole and extends to the edge of the lower partition plate.

[0016] As an optional implementation, the connecting groove extends through the pole positioning part to form a connecting channel in the pole positioning part.

[0017] As an optional implementation, the lower partition plate has a thinning groove on the side facing the collector plate. In the thickness direction of the lower partition plate, the thinning groove overlaps with the edge of the pole base plate, and the connecting groove communicates with the thinning groove.

[0018] As an optional implementation, the cover plate structure is circular, the arc length of the welding area between the pole base plate and the collector plate is L1, the arc length of the thinning groove is L2, and the circumference of the collector plate is L3, wherein L1, L2, and L3 satisfy: L1 < L2; and / or

[0019] 0.2L3≤L1≤0.7L3.

[0020] As an optional implementation, the depth of the thinning groove along the thickness direction of the lower partition is h2, wherein h2 satisfies: h2 > 0.5 mm.

[0021] As an optional implementation, the pole body includes a plate part and a column part connected together. The plate part is located on the other side of the cover plate, and the column part passes through the cover plate and is connected to the pole base plate. The pole base plate has a central hole, and the column part passes through the central hole.

[0022] As an optional implementation, along the thickness direction of the cover plate, the depth of the cover plate positioning member is h, the height of the cover plate positioning part is h1, and the thickness of the cover plate is H, wherein h, h1, and H satisfy: 0.5mm ≤ h ≤ 0.8H; and / or

[0023] 0.6h≤h1≤h.

[0024] The battery provided in this application, by providing a cover plate positioning part and a terminal post positioning part on the lower separator, which respectively cooperate with the cover plate positioning component and the terminal post positioning component, can effectively fix the position of the cover plate and terminal post assembly, enhance the fixed connection strength between the terminal post, the lower separator, and the cover plate, improve the stability of the entire structure, prevent the assembly from loosening or shifting during high-rate charging and discharging, improve the mechanical strength and thermal stability of the battery, thereby improving the battery's safety and service life. The presence of the lower separator can absorb and mitigate the impact of external shocks or vibrations on the cover plate and terminal post assembly to a certain extent, extending the product's service life. At the same time, the design of the positioning part and positioning hole ensures accurate alignment of the cover plate and terminal post assembly during installation, improves installation accuracy, reduces the risk of failure due to improper installation, and allows the cover plate, terminal post assembly, and lower separator to fit tightly together, reducing the gap between the components, thereby reducing the impact of the external environment on the internal components. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 A cross-sectional view of a battery provided in an embodiment of this application;

[0027] Figure 2 for Figure 1 One of the exploded structural diagrams of the cover plate structure of the battery shown;

[0028] Figure 3 for Figure 1 The second partially exploded structural diagram of the cover plate structure of the battery shown.

[0029] Figure 4 for Figure 1 A cross-sectional view of a portion of the battery structure shown.

[0030] Figure 5 for Figure 1 A cross-sectional view of the cover structure of the battery shown.

[0031] Figure 6 for Figure 2 A schematic diagram of the lower partition of the cover plate structure shown;

[0032] Figure 7 for Figure 6 The lower partition shown is a cross-sectional view.

[0033] Explanation of reference numerals in the attached figures:

[0034] 100-Cover plate structure; 10-Cover plate; 11-Cover plate positioning component; 12-Pole post mounting hole; 13-Shell positioning step; 14-Explosion-proof valve; 15-Injection hole; 20-Lower partition; 21-Cover plate positioning part; 211-Channel; 22-Pole post positioning part; 221-Arc-shaped part; 222-Pole post positioning post; 223-Connecting channel; 23-Abutting post; 24-Thinning groove; 25-Pole post hole; 26-Connecting groove ; 30-Terminal assembly; 31-Terminal body; 311-Plate section; 312-Post section; 32-Terminal base plate; 321-Terminal positioning component; 322-Current collector positioning component; 323-Center hole; 324-Sinking groove; 40-Current collector; 41-Current collector positioning part; 42-Welding part; 43-Weight reduction hole; 50-Upper separator; 60-Sealing ring; 200-Battery; 201-Casing; 202-Cell. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0036] Currently, with the continuous development of new energy technologies, the performance requirements for battery packs are increasing. Cylindrical batteries, due to their high energy density, simple structure, low cost, and many other advantages, have become an ideal battery cell structure.

[0037] However, traditional cylindrical batteries, while pursuing high energy density, often struggle to achieve fast charging performance. The connection method between the traditional battery cover and terminals can lead to overheating, poor contact, and insufficient mechanical strength under high-rate charge and discharge conditions, resulting in structural instability and affecting battery safety and performance.

[0038] To overcome the shortcomings of existing technologies, after repeated consideration and verification, the inventors discovered that if a cover plate positioning part is provided on the side of the lower plastic near the cover plate and an electrode positioning part is provided on the side of the lower plastic near the electrode base plate, and structures that cooperate with the cover plate positioning part and the electrode positioning part are respectively provided on the cover plate and the electrode base plate, the fixing effect between the lower plastic and the cover plate and the electrode can be enhanced, thereby ensuring the mechanical strength of the cover plate under high-rate charging and discharging, improving the structural stability of the battery, and thus improving the high-rate charging and discharging performance and the safety and reliability of the battery.

[0039] In view of the above, this application provides a battery, comprising:

[0040] case;

[0041] The battery cell is housed within the casing.

[0042] The cover plate structure includes a cover plate, pole post assembly, and lower partition plate.

[0043] The cover plate covers the housing and has pole mounting holes;

[0044] The electrode assembly includes an electrode body and an electrode base plate. The electrode base plate is located on the side of the cover plate near the battery cell, and the electrode body is located on the side of the cover plate away from the battery cell and passes through the electrode mounting hole to connect with the electrode base plate. A lower partition plate is located between the cover plate and the electrode base plate. The lower partition plate has a cover plate positioning part on the side facing the cover plate and an electrode positioning part on the side facing the electrode base plate. The cover plate has a cover plate positioning element that cooperates with the cover plate positioning part, and the electrode base plate has an electrode positioning element that cooperates with the electrode positioning part.

[0045] By incorporating cover plate positioning parts and terminal post positioning parts on the lower separator, which respectively cooperate with cover plate positioning components and terminal post positioning components, the positions of the cover plate and terminal post assemblies can be effectively fixed. This enhances the fixed connection strength between the terminal post, lower separator, and cover plate, improves the stability of the entire structure, prevents loosening or displacement of the components during high-rate charging and discharging, and improves the mechanical strength and thermal stability of the battery, thereby enhancing battery safety and lifespan. The presence of the lower separator can absorb and mitigate the impact of external shocks or vibrations on the cover plate and terminal post assemblies to a certain extent, extending the product's lifespan. Simultaneously, the design of the positioning parts and positioning holes ensures accurate alignment of the cover plate and terminal post assemblies during installation, improving installation precision, reducing the risk of failure due to improper installation, and allowing the cover plate, terminal post assemblies, and lower separator to fit tightly, reducing gaps between components and thus minimizing the impact of the external environment on internal components. Standardized positioning design simplifies the production process, improves assembly efficiency, and reduces production costs. Furthermore, due to the clear positioning of each component, disassembly and reassembly become simpler and faster, facilitating later maintenance and repair.

[0046] The contents of this application will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can have a clearer and more detailed understanding of the contents of this application.

[0047] The following sections provide a detailed description of the specific structure of the cover plate and various possible implementation methods.

[0048] Figure 1 A cross-sectional view of a battery provided in an embodiment of this application. Figure 2 for Figure 1One of the exploded structural diagrams of the cover plate structure of the battery shown. Figure 3 for Figure 1 The second partially exploded structural diagram of the battery cover plate structure shown. Figure 4 for Figure 1 A cross-sectional view of a portion of the battery structure shown. Figure 5 for Figure 1 A cross-sectional view of the cover structure of the battery shown. Figure 6 for Figure 2 A schematic diagram of the lower partition of the cover plate structure shown. Figure 7 for Figure 6 The lower partition shown is a cross-sectional view.

[0049] like Figure 1 As shown in the embodiment of this application, the cover structure 100 is used on the battery 200. The cover structure 100 is used to cover the casing 201 of the battery 200 to seal the battery cell 202 of the battery 200.

[0050] As an optional implementation, battery 200 has a cylindrical battery structure.

[0051] like Figure 2 and Figure 3 As shown, the cover plate structure 100 includes a cover plate 10, an electrode post assembly 30, and a lower partition plate 20. The electrode post assembly 30 includes an electrode post body 31 and an electrode post base plate 32. The electrode post body 31 and the electrode post base plate 32 are respectively disposed on both sides of the cover plate 10. That is, the electrode post base plate 32 is disposed on the side of the cover plate 10 closest to the battery cell 202. The electrode post body 31 is disposed on the side of the cover plate 10 away from the battery cell 202 and passes through the cover plate 10 to connect with the electrode post base plate 32. The lower partition plate 20 is disposed between the cover plate 10 and the electrode post base plate 32.

[0052] The cover plate 10 is provided with pole mounting holes 12, and the pole body 31 passes through the pole mounting holes 12 and is connected to the pole base plate 32.

[0053] The lower partition 20 has a cover plate positioning part 21 on the side facing the cover plate 10, and an pole post positioning part 22 on the side facing the pole post base plate 32.

[0054] The cover plate 10 is provided with a cover plate positioning member 11 that cooperates with the cover plate positioning part 21. The cover plate positioning part 21 cooperates with the cover plate positioning member 11 to position and fix the cover plate 10 to the lower partition plate 20.

[0055] The pole base plate 32 is provided with a pole positioning member 321 that cooperates with the pole positioning part 22. The pole positioning part 22 and the pole positioning member 321 cooperate to position and fix the pole base plate 32 and the lower partition plate 20.

[0056] By providing a cover plate positioning part 21 and a terminal post positioning part 22 on the lower separator 20, and having them cooperate with the cover plate positioning member 11 and the terminal post positioning member 321 respectively, the positions of the cover plate 10 and the terminal post assembly 30 can be effectively fixed. This enhances the fixed connection strength between the terminal post assembly 30, the lower separator 20, and the cover plate 10, improves the stability of the entire cover plate structure 100, prevents the assembly from loosening or shifting during high-rate charging and discharging, and improves the mechanical strength and thermal stability of the battery 200. This allows the battery 200 to be charged and discharged using high-rate terminals, thereby improving the safety and lifespan of the battery 200 and enabling the cylindrical battery structure to have fast-charging performance. The cover plate positioning part 21 and the terminal post positioning part 22 are located on the lower separator 20, saving space, and the stress point is on the positioning part, resulting in high structural strength and better resistance to torsion.

[0057] The presence of the lower partition 20 can absorb and mitigate the impact of external shocks or vibrations on the cover plate 10 and the pole post assembly 30 to a certain extent, extending the product's service life. Simultaneously, the design of the positioning part and positioning holes ensures accurate alignment of the cover plate 10 and the pole post assembly 30 during installation, improving installation precision, reducing the risk of failure due to improper installation, and allowing the cover plate 10, pole post assembly 30, and lower partition 20 to fit tightly together, reducing gaps between components, resulting in a compact structure, increased energy density, and reduced impact of the external environment on internal components. Because the positioning of each component is clearly defined, disassembly and reassembly become simpler and faster, facilitating later maintenance and repair.

[0058] As an optional implementation, the cover plate positioning member 11 is a hole opened on the cover plate 10, and the pole positioning member 321 is a hole opened on the pole base plate 32.

[0059] As an optional implementation, the cover structure 100 is the negative electrode cover of the battery 200, and the cover structure 100 is welded to the housing 201.

[0060] As an optional implementation, the cover structure 100 also includes a collector plate 40. The collector plate 40 is disposed on the side of the pole post base plate 32 opposite to the lower partition plate 20. Along the length of the pole post base plate 32, the two side edges of the pole post base plate 32 are welded to the collector plate 40.

[0061] The current collector 40 is disposed between the electrode base plate 32 and the battery cell 202. The current collector 40 has a sheet-like structure. The lower surface of the current collector 40 abuts against and is welded to the battery cell 202. The electrode base plate 32 is welded to the upper surface of the current collector 40.

[0062] By welding the two side edges of the terminal base plate 32 to the current collector 40, a robust mechanical connection is provided, enhancing the strength and reliability of the electrical and mechanical connections and ensuring stability under high current or high vibration environments. The welded connection between the current collector 40 and the terminal base plate 32 provides greater current carrying capacity, enabling the battery to perform high-rate charging and discharging.

[0063] As an optional implementation, the lower partition 20 is provided with an abutment post 23 on the side facing the collector plate 40. The abutment post 23 abuts against the collector plate 40.

[0064] The direct contact between the abutment post 23 and the current collector 40 provides additional support points, supporting the current collector 40, enhancing the stability of the entire cover structure 100, reducing relative movement between components, and preventing cell 202 from shaking during use. The abutment post 23 effectively transmits the force from the current collector 40 to the lower separator 20, helping to disperse and evenly distribute stress, reducing the potential damage to the structure caused by localized stress concentration. The design of the abutment post 23 can absorb and mitigate vibration and impact from the current collector 40 to a certain extent, protecting other components from damage and improving the overall system durability. In the battery 200, the current collector 40 is used for current collection and distribution, generating a large amount of heat. The contact between the abutment post 23 and the current collector 40 can, to a certain extent, promote the conduction and dissipation of heat to the lower separator 20, optimizing thermal management performance.

[0065] At the same time, the abutment post 23 also helps to position the manifold 40 during installation, ensuring its correct alignment with other components, simplifying the assembly process and improving assembly accuracy.

[0066] As an optional implementation, the lower partition 20 is provided with a pole hole 25, the pole body 31 passes through the pole hole 25, and the lower partition 20 is provided with a connecting groove 26 on the side facing the pole base plate 32. The connecting groove 26 communicates with the pole hole 25 and extends to the edge of the lower partition 20.

[0067] The design of the connecting groove 26 allows the lower part of the electrode post hole 25 to communicate with the outside through the connecting groove 26, thereby facilitating the discharge of gas during assembly and allowing the electrode post body 31 to be inserted and removed more easily, simplifying the assembly and maintenance process, especially in applications requiring frequent disassembly and assembly. The connecting groove 26 provides a path for the electrolyte to flow between the edge of the electrode post hole 25 and the lower partition plate 20, which is beneficial for electrolyte wetting. Furthermore, because the connecting groove 26 is located between the lower partition plate 20 and the electrode post base plate 32, it avoids an overly tight contact seal between the lower partition plate 20 and the electrode post base plate 32 due to abutment, thus preventing false detections of the sealing ring 60's sealing performance.

[0068] By removing unnecessary material, the connecting slot 26 also helps reduce the weight of the lower partition 20, thereby improving the overall system energy efficiency. The connecting slot 26 increases the surface area of ​​the components, which helps dissipate heat, improves the system's heat dissipation performance, and enhances thermal stability.

[0069] As an optional implementation, the connecting groove 26 penetrates the pole positioning part 22 and forms a connecting channel 223 on the pole positioning part 22. The connecting groove 26 communicates with the connecting channel 223.

[0070] By penetrating the electrode positioning part 22 and forming a connecting channel 223 on the electrode positioning part 22, it is possible to avoid excessively tight contact and sealing between the lower partition plate 20 and the electrode base plate 32 due to abutment, which could lead to false detections in the sealing performance test of the sealing ring 60. Simultaneously, the connecting channel 223 allows electrolyte to flow through the electrode positioning part 321 and the current collector positioning part 41 into the cell 202, increasing the electrolyte flow channel and facilitating electrolyte wetting. The connecting channel 223 reduces the material used in the electrode positioning part 22, lowers the weight of the lower partition plate 20, and also reduces production costs while maintaining the compactness, integrity, and functionality of the lower partition plate 20 structure. Furthermore, the design of the connecting channel 223 allows the outer periphery of the electrode positioning part 22 to protect the connecting groove 26 during assembly.

[0071] As an optional implementation, the lower partition 20 has a thinning groove 24 on the side facing the collector plate 40, and the thinning groove 24 is opposite to the edge of the pole base plate 32. That is, in the thickness direction of the lower partition 20, the thinning groove 24 overlaps with the edge of the pole base plate 32.

[0072] In the projection area where the pole base plate 32 is welded to the collector plate 40, a thinning groove 24 is provided at the edge of the lower partition plate 20.

[0073] The design of the thinning groove 24 helps alleviate the thermal stress generated during welding. By setting the thinning groove 24 on the lower partition plate 20, the high temperature generated during welding of the pole base plate 32 and the manifold 40 prevents the lower partition plate 20 from melting, thus reducing material deformation and stress concentration of the lower partition plate 20 due to thermal expansion and contraction. The thinning groove 24 also promotes heat dissipation, helps manage the temperature of the welding area, and prevents overheating from affecting the material properties of the lower partition plate 20, thereby improving the thermal stability of the overall system. By setting the thinning groove 24 near the welding area, the material flow during the welding process can be better controlled, improving welding quality and reducing welding defects.

[0074] The presence of the thinning groove 24 reduces the amount of material used, thereby reducing the overall weight of the component and helping to improve system energy efficiency and reduce transportation costs. The design of the thinning groove 24 provides a certain degree of structural flexibility, allowing for minor deformation under thermal cycling or mechanical loads, thereby reducing material fatigue and extending component life.

[0075] As an optional implementation, one end of the connecting groove 26 is connected to the pole hole 25, and the other end is connected to the thinning groove 24.

[0076] As an optional implementation, the lower partition 20 is provided with two cover plate positioning parts 21 on the side facing the cover plate 10, and the lower partition 20 is provided with two pole post positioning parts 22 on the side facing the pole post base plate 32, thereby improving the positioning accuracy.

[0077] As an optional implementation, the cover plate positioning part 21 and the pole positioning part 22 may be annular or columnar protrusions.

[0078] As an optional implementation, the pole positioning part 22 includes at least two arc-shaped parts 221 and a pole positioning post 222. The centers of the at least two arc-shaped parts 221 coincide and have the same radius, thereby forming a pole positioning part 22 with a circular outer circumference. The arc-shaped parts 221 cooperate with the pole positioning member 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 arc-shaped parts 221. The pole positioning post 222 is used to improve the overall structural strength of the pole positioning part 22.

[0079] The cooperation between the arc-shaped part 221 and the pole positioning post 222 enables the pole base plate 32 to be quickly aligned and fixed during installation, reducing installation time and complexity and improving assembly efficiency.

[0080] The cooperation of multiple arc-shaped portions 221 with the pole post positioning component 321 provides a multi-point contact positioning method, which can better limit the radial movement of the pole post 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 post base plate 32 from rotating during installation or use, ensuring that the pole post base plate 32 always remains in the correct position and orientation. The design of the arc-shaped portions 221 helps to evenly distribute external forces around the pole post positioning component 321. The cooperation between the arc-shaped portions 221 and the pole post positioning component 321 provides an effective anti-torsion function, preventing the pole post base plate 32 from twisting due to external forces during use, reducing material fatigue or damage that may be caused by single-point stress, and improving the overall structural durability.

[0081] The pole positioning post 222 is located between at least two arc-shaped portions 221, providing additional support and fixing points, further enhancing the stability of the pole and preventing its axial movement. As a columnar structure, the pole positioning post 222 plays a role in improving the overall structural strength. It not only provides additional support for the pole base plate 32, but also enhances the pole assembly 30's resistance to deformation under external pressure.

[0082] As an optional implementation, the pole positioning part 22 includes two arc-shaped parts 221, which are symmetrically arranged and form a connecting channel 223 between them. The pole positioning post 222 is located between the two arc-shaped parts 221.

[0083] As an optional implementation, the cover plate positioning part 21 is provided with a channel 211 in the middle.

[0084] By providing a channel 211 in the middle of the cover plate positioning part 21, the presence of the channel 211 can effectively reduce the amount of material used, thereby reducing the overall weight of the lower partition 20. At the same time, it can also reduce production costs while maintaining structural integrity and functionality. Furthermore, the design of the channel 211 can be used to guide tools or fasteners during installation, simplifying installation steps and improving assembly efficiency.

[0085] As an optional implementation, the axis of the cover plate positioning part 21 coincides with the axis of the pole post positioning part 22 along the thickness direction of the lower partition plate 20.

[0086] The coincident axis design makes the cover plate positioning part 21 and the pole post positioning part 22 more symmetrical in structure, which helps to evenly distribute stress, reduce stress concentration problems caused by asymmetrical design, and improve the stability and durability of the overall lower partition 20 structure. At the same time, this design can make more effective use of the thickness space of the lower partition 20, reduce unnecessary material waste, ensure a tight fit between components, have a compact structure, improve energy density, and also ensure that the cover plate 10 and the pole post assembly 30 can automatically align during installation, reducing the need for manual adjustment and improving installation accuracy and efficiency.

[0087] Because symmetrical structures are easier to process and assemble, the design with coincident axes can also simplify the design and manufacturing process of the lower partition 20 mold, thereby reducing production complexity and cost.

[0088] As an optional implementation, the cover plate structure 100 is circular, the arc length of the welding area between the pole base plate 32 and the collector plate 40 is L1, and the arc length of the thinning groove 24 is L2, wherein L1 and L2 satisfy: L1 < L2.

[0089] Since the two sides of the pole base plate 32 are welded to the collector plate 40 respectively, L1 represents the sum of the arc lengths of the welding areas of the pole base plate 32 and the collector plate 40.

[0090] Two thinning grooves 24 are also provided. Therefore, L2 represents the sum of the arc lengths of the two thinning grooves 24.

[0091] In this application, L1 < L2 means that the arc length of the welding area on each side is less than the arc length of the thinning groove 24 on the corresponding side.

[0092] By designing L1 < L2, the arc length of the thinning groove 24 is greater than that of the welding area, providing a larger stress buffer zone around the welding area. This helps to evenly distribute and alleviate the thermal and mechanical stresses generated during welding. 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. Simultaneously, the larger arc length of the thinning groove 24 provides structural flexibility, allowing for minor deformations under mechanical loads or thermal cycling, thereby reducing material fatigue and extending component life.

[0093] By limiting the arc length of the welding area, the welding process can be better concentrated, 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.

[0094] As an optional implementation, 2mm ≤ L2-L1.

[0095] As an optional implementation, the perimeter of the collector disk 40 is L3, wherein L1 and L3 satisfy: 0.2L3≤L1≤0.7L3.

[0096] By setting L1 to between 20% and 70% of the manifold's circumference, sufficient length is ensured for the welding area to provide the necessary mechanical and electrical connection strength, while avoiding material waste and potential thermal damage caused by over-welding.

[0097] The range of arc length selection from 20% to 70% allows for a balance between weld strength and structural flexibility. Shorter weld lengths (close to 0.2L3) offer greater structural flexibility, with 0.2L3 ≤ L1 preventing insufficient current flow between the manifold 40 and the pole base plate 32, while longer weld lengths (close to 0.7L3) enhance connection stability. By limiting the arc length of the weld area, heat concentration during welding can be reduced, minimizing the thermal impact on the manifold 40 and other components, thereby improving overall thermal management performance.

[0098] Furthermore, a reasonable weld length range helps reduce the use of welding materials and energy consumption, thereby lowering production costs while maintaining the necessary connection strength. Appropriate weld length design allows for a more even distribution of mechanical and thermal stresses, reducing the impact of stress concentration on structural integrity.

[0099] As an optional implementation, the collector plate 40 is provided with a collector plate positioning part 41 on the side facing the pole post base plate 32, and the pole post base plate 32 is provided with a collector plate positioning part 322 that cooperates with the collector plate positioning part 41.

[0100] The cooperation between the collector plate positioning part 41 and the collector plate positioning part 322 ensures the precise alignment between the collector plate 40 and the pole base plate 32, which helps to reduce errors during assembly, improve the assembly accuracy of the components, simplify the installation process of the collector plate 40 and the pole base plate 32, reduce the need for manual adjustment, and thus improve assembly efficiency and production speed.

[0101] The design of the manifold positioning part 41 and the manifold positioning component 322 provides additional mechanical fixing points, enhancing the stability between the manifold 40 and the pole base plate 32 and preventing relative movement caused by vibration or impact during use. Simultaneously, the cooperation between the manifold positioning part 41 and the manifold positioning component 322 effectively prevents misalignment of the manifold 40 during welding or use, ensuring the reliability and consistency of the electrical connection.

[0102] As an optional implementation, the collector plate positioning component 322 is a hole opened on the pole base plate 32.

[0103] As an optional implementation, the pole positioning member 321 and the collector plate positioning member 322 are aligned along the thickness direction of the pole base plate 32.

[0104] The coincident axis design makes the pole base plate 32 more symmetrical in structure, which helps to evenly distribute stress, reduce stress concentration problems caused by asymmetrical design, and improve the overall stability and durability of the pole base plate 32 structure. At the same time, this design can more effectively utilize the thickness space of the pole base plate 32, reducing unnecessary material waste, while ensuring a tight fit between components, a compact structure, and improved energy density. It also ensures that the pole base plate 32, the current collector 40, and the lower partition 20 can automatically align during installation, improving component assembly accuracy, reducing the need for manual adjustments, and improving installation accuracy and efficiency. In the assembly of multiple components, the coincident axis design can reduce assembly inaccuracies caused by cumulative errors, ensuring the accuracy and consistency of the overall structure.

[0105] Because the symmetrical structure is easier to process and assemble, the design with the axis coincidence can also simplify the design and manufacturing process of the pole base plate 32, thereby reducing production complexity and cost.

[0106] As an optional implementation, the diameter of the pole positioning member 321 is larger than the diameter of the collector plate positioning member 322.

[0107] The larger pole post positioning element 321 provides installation flexibility, allowing for fine-tuning during assembly to ensure proper alignment of the lower partition 20 and the pole post base plate 32, compensating for manufacturing tolerances and assembly errors. Due to the larger size of the pole post positioning element 321, the assembly is easier to insert and position during initial alignment, thus simplifying the assembly process and improving production efficiency. The larger aperture of the pole post positioning element 321 better accommodates the thermal expansion and contraction of the material due to temperature changes, preventing deformation or damage caused by thermal stress.

[0108] As an optional implementation, the collector plate 40 is provided with a welding part 42, which is used to weld to the edge of the pole base plate 32.

[0109] The welding section 42 is specifically designed for welding, providing a specially designed area to achieve robust mechanical and electrical connections, enhancing the overall structural strength and stability. By establishing a dedicated welding section 42 on the manifold 40, the welding process can be better controlled, welding quality improved, and welding defects such as porosity and cracks reduced. The design of the welding section 42 helps to concentrate and control welding heat, reducing the thermal impact on the manifold 40 and other parts of the pole base plate 32, thereby protecting the integrity and performance of the materials. The presence of the welding section 42 helps to evenly distribute the stress generated during the welding process, reducing stress concentration and lowering the risk of structural failure.

[0110] As an optional implementation, the welding part 42 is arranged around the outer periphery of the collector plate 40, and the welding part 42 can abut against the pole base plate 32 and be welded on the abutment surface.

[0111] Since the welding position between the pole base plate 32 and the collector plate 40 is on the outer periphery of the collector plate 40, the welding is visible and the welding reliability is high.

[0112] As an optional implementation, the collector plate 40 is provided with weight-reducing holes 43. The weight-reducing holes 43 are through holes, which reduce the mass and facilitate the wetting of the electrolyte in the battery 200.

[0113] The weight-reduction holes 43 directly reduce the material used in the collector plate 40, thereby reducing the overall weight of the component and contributing to improved energy efficiency and performance. Reducing material usage lowers production costs, as well as transportation and installation costs, especially in large-scale production and transportation. Simultaneously, the weight-reduction holes 43 increase the surface area of ​​the collector plate 40, aiding in heat dissipation and improving the component's heat dissipation performance, thus enhancing the system's thermal stability.

[0114] The design of the weight-reducing holes 43 can also alter the vibration characteristics of the collector plate 40, reduce resonance, and improve the stability of the system under dynamic environments. Properly designed weight-reducing holes 43 can help optimize stress distribution, reduce stress concentration, and lower the risk of material fatigue and failure.

[0115] As an optional implementation, the pole body 31 includes a plate portion 311 and a column portion 312 connected together. The plate portion 311 is located on the other side of the cover plate 10, and the column portion 312 passes through the cover plate 10 and is connected to the pole base plate 32.

[0116] The plate portion 311 provides a planar support, enhancing the structural stability of the pole body 31 and reducing the risk of deformation under mechanical loads. The column portion 312 connects to the pole base plate 32 via the cover plate 10, forming an effective force transmission path to ensure efficient transfer of mechanical stress and current. The design of the column portion 312 passing through the cover plate 10 simplifies the installation process, ensuring that the pole body 31 can be quickly and accurately aligned and connected to other components. The connection via the column portion 312 ensures reliable current conduction 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 dissipate heat and improves the heat dissipation performance of the component.

[0117] As an alternative implementation, the electrode body 31 is made of composite material, with aluminum used for the outer side of the battery and copper used for the inner side, thereby optimizing the battery's performance and cost.

[0118] As an optional implementation, the pole base plate 32 is provided with a central hole 323, and the pole body 312 passes through the central hole 323. The pole body 312 passes through the upper partition plate 50, the cover plate 10 and the sealing ring 60, and abuts against the central hole 323, with the outer wall surface of the pole body 312 fitting against the hole wall of the central hole 323.

[0119] The central hole 323 provides a clear positioning point for the column portion 312, ensuring precise alignment between the pole body 31 and the pole base plate 32, thus improving assembly accuracy. The column portion 312 connects to the pole base plate 32 via the central hole 323, forming a robust mechanical and electrical connection, enhancing the overall structural strength and stability. The design of the central hole 323 allows for quick insertion and positioning of the column portion 312, simplifying the assembly process and reducing assembly time and complexity. Through the connection via the central hole 323, mechanical stress and current can be effectively transmitted along the designed path, reducing stress concentration and resistance loss. The design of the central hole 323 helps protect the integrity of the column portion 312 during assembly and use, reducing the risk of damage caused by external factors.

[0120] As an optional implementation, the pole post base plate 32 has a recessed groove 324 on the side opposite to the lower partition plate 20. The central hole 323 communicates with the recessed groove 324. Along the thickness direction of the pole post base plate 32, the height difference between the end face of the column portion 312 away from the plate portion 311 and the bottom surface of the recessed groove 324 is less than or equal to 0.5 mm. The end face of the column portion 312 is welded to the bottom surface of the recessed groove 324 of the pole post base plate 32.

[0121] The recessed groove 324 provides an additional positioning and support structure, enabling the column portion 312 to be positioned more stably during assembly, reducing assembly errors and improving the overall structural stability. By maintaining a height difference of less than or equal to 0.5 mm between the end face of the column portion 312 and the bottom surface of the recessed groove 324, the weld thickness is accommodated when the column portion 312 is welded to the pole base plate 32, thereby improving the integration of the component, making the overall structure compact, increasing energy density, and ensuring tight mechanical contact, enhancing connection strength and stability. The design of the recessed groove 324 helps to evenly distribute mechanical stress, reduce stress concentration, and lower the risk of material fatigue and failure. The presence of the recessed groove 324 increases the surface area of ​​the component, which helps dissipate heat, improves the heat dissipation performance of the component, and enhances the thermal stability of the system. The recessed groove 324 provides a physical constraint for the column portion 312, preventing component displacement due to vibration or impact during use and ensuring the reliability of electrical and mechanical connections.

[0122] As an optional implementation, the cover plate 10 is provided with a pole mounting hole 12, and the pole body 312 passes through the pole mounting hole 12 and is connected to the pole base plate 32.

[0123] The pole mounting hole 12 provides a clear path and positioning point for the pole body 312, ensuring 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 312 and the pole base plate 32 form a robust mechanical connection, enhancing the strength and stability of the overall structure. The design of the pole mounting hole 12 allows for quick insertion and positioning of the pole body 312, simplifying the assembly process and reducing assembly time and complexity. The connection between the pole body 312 and the pole base plate 32 via the pole mounting hole 12 forms an effective force transmission path, ensuring effective transmission of mechanical stress and current, reducing stress concentration and resistance loss. The pole mounting hole 12 provides a physical constraint for the pole body 312, preventing component displacement due to vibration or impact during use and ensuring the reliability of electrical and mechanical connections.

[0124] As an optional implementation, the depth of the cover plate positioning member 11 along the thickness direction of the cover plate 10 is h, and the thickness of the cover plate 10 is H, wherein h and H satisfy: 0.5mm≤h≤0.8H.

[0125] The cover plate positioning component 11 is a countersunk hole. By limiting the depth of the countersunk hole 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 prevented from being weakened due to excessive hole depth. An appropriate hole depth (0.5mm≤h) provides sufficient positioning depth, ensuring precise alignment between the cover plate 10 and the lower partition 20 during assembly, guaranteeing positioning reliability, and also providing anti-torsion capability, improving assembly accuracy and stability. The hole depth design provides sufficient positioning function while retaining sufficient thickness of the cover plate 10, enhancing the overall structural stability and deformation resistance. By limiting the hole depth (h≤0.8H), excessive penetration during processing is prevented, ensuring the structural strength of the cover plate 10 at this location and protecting its integrity and function. The appropriate hole depth design also reduces the impact on the heat conduction path of the cover plate 10, helping to maintain good thermal management performance.

[0126] As an optional implementation, the height of the cover plate positioning part 21 along the thickness direction of the cover plate 10 is h1, wherein h and h1 satisfy: 0.6h≤h1≤h.

[0127] By ensuring that the height h1 of the cover plate positioning part 21 is between 0.6h and h, sufficient contact area and depth are provided, enabling the cover plate 10 and the lower partition 20 to be stably positioned during assembly, reducing assembly errors. The height design of the cover plate positioning part 21, without exceeding the depth of the cover plate positioning member 11 (h1≤h), ensures the strength and stability of the structure, avoiding structural weakness caused by an excessively high cover plate positioning part 21. An appropriate height h1 (0.6h≤h1) ensures a tight fit between the cover plate positioning part 21 and the cover plate positioning member 11, preventing loosening due to vibration or impact during use and improving connection reliability. This height design allows the cover plate positioning member 11 to be quickly inserted and positioned, simplifying the assembly process and reducing assembly time and complexity.

[0128] As an optional implementation, the depth of the thinning groove 24 along the thickness direction of the lower partition 20 is h2, wherein h2 satisfies: h2>0.5mm.

[0129] By incorporating thinning grooves 24 and ensuring their depth is greater than 0.5 mm, the material used in the lower separator 20 can be effectively reduced, thereby lowering the overall module weight, improving system energy efficiency, reducing production costs, and also reducing resource consumption. The thinning grooves 24 increase the surface area of ​​the lower separator 20, which helps dissipate heat, improves the module's heat dissipation performance, and prevents deformation of the lower separator 20 due to the high temperatures generated during the welding connection between the electrode base plate 32 and the current collector 40, thus improving the system's thermal stability.

[0130] As an optional implementation, along the thickness direction of the pole base plate 32, the weld width of the welding area between the pole base plate 32 and the manifold 40 is w, where w satisfies: 0.4mm≤w≤1.2mm.

[0131] The weld width design ensures sufficient strength in the weld area to withstand mechanical and thermal stresses, guaranteeing the reliability and durability of the joint. By limiting the weld width to within 1.2 mm, the size of the heat-affected zone is reduced, lowering the risk of material performance degradation due to overheating, as shown in the lower partition 20, thus maintaining the material's mechanical and electrical properties. Appropriate weld width design reduces the amount of welding material used, lowering production costs and minimizing potential material waste during welding. Weld width control helps form a uniform and continuous weld, reducing welding defects such as porosity and cracks, and improving weld quality.

[0132] As an optional implementation, the surface of the lower partition 20 facing the cover plate 10 is attached to the surface of the cover plate 10 facing the lower partition 20.

[0133] The lower partition 20 and the cover plate 10 are tightly fitted together to form an integral structural unit, increasing the rigidity and stability of the overall assembly, reducing the risk of deformation under mechanical loads, and improving the energy density of the overall assembly. The tightly fitted surfaces effectively prevent the ingress of dust, moisture, and other contaminants, improving the system's sealing performance and protecting the safety and function of internal components. Simultaneously, the fitted surfaces provide good thermal contact, facilitating efficient heat conduction 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.

[0134] As an optional implementation, the surface of the lower partition 20 facing the pole base plate 32 is attached to the surface of the pole base plate 32 facing the lower partition 20.

[0135] The lower partition 20 is tightly fitted to the pole base plate 32, forming an integral structural unit. This increases the rigidity and stability of the overall assembly, reduces the risk of deformation under mechanical loads, and improves the energy density of the compact assembly. The tightly fitted surfaces effectively prevent the ingress of dust, moisture, and other contaminants, improving the system's sealing performance and protecting the safety and function of internal components. Simultaneously, the fitted surfaces provide good thermal contact, facilitating efficient heat conduction 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.

[0136] As an optional implementation, 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, through which the pole body 31 passes. The sealing ring 60 is sleeved on the pole body 31 and abuts against 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, serving a sealing and insulating function.

[0137] A sealing ring 60 is fitted onto the electrode post body 31 and abuts against the upper partition plate 50, ensuring an effective seal between the electrode post body 31 and the cover plate 10. This prevents dust, moisture, and other contaminants from entering the internal components, protecting the system's safety and function. The cooperation between the sealing ring 60 and the upper partition plate 50 effectively prevents liquid or gas leakage, ensuring the normal operation of the system. The sealing ring 60 is typically made of an elastic material, providing shock absorption and cushioning, reducing the impact of vibration on the system, and improving its stability and durability. The sealing ring 60 and the upper partition plate 50 separate the electrode post body 31 from the cover plate 10, also preventing short circuits caused by electrical connection between the electrode post assembly 30 and the cover plate 10.

[0138] As an optional implementation, the cover plate 10 is provided with a housing positioning step 13, which is used to position the cover plate 10 on the housing 201.

[0139] The positioning step 13 provides a clear positioning reference, enabling the cover plate 10 to be precisely 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 plate 10 on the housing 201 is more stable, reducing potential displacement or loosening during use and improving the overall structural stability. The design of the positioning step 13 makes the assembly process more intuitive and simple, reducing the need for complex tools and processes, and improving assembly efficiency and consistency. The positioning step 13 helps to evenly distribute mechanical stress between the cover plate 10 and the housing 201, reducing stress concentration and lowering the risk of material fatigue and failure. The positioning step 13 helps to ensure tight contact between the cover plate 10 and the housing 201, enhancing the sealing effect and preventing the ingress of dust, moisture, and other contaminants.

[0140] As an optional implementation, the cover plate 10 is provided with an explosion-proof valve 14 and a liquid injection hole 15.

[0141] By integrating the explosion-proof valve 14 and the injection port 15 on the cover plate 10, the need for external safety devices and complex maintenance procedures is reduced, thus lowering the overall cost of the system.

[0142] The explosion-proof valve 14 automatically opens when the internal pressure is too high, releasing excess pressure and preventing explosions or other dangerous situations caused by overpressure, thus improving system safety. The 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.

[0143] The cover plate structure 100 provided in this embodiment includes a cover plate 10, an electrode post assembly 30, and a lower partition plate 20. The electrode post assembly 30 includes an electrode post body 31 and an electrode post base plate 32. The electrode post base plate 32 is located on the side of the cover plate 10 near the battery cell 202. The electrode post body 31 is located on the side of the cover plate 10 away from the battery cell 202 and passes through the cover plate 10 to connect with the electrode post base plate 32. The lower partition plate 20 is located between the cover plate 10 and the electrode post base plate 32. The side of the lower partition plate 20 facing the cover plate 10 is provided with a cover plate positioning part 21, and the side of the lower partition plate 20 facing the electrode post base plate 32 is provided with an electrode post positioning part 22. The cover plate 10 is provided with a cover plate positioning member 11 that cooperates with the cover plate positioning part 21, and the electrode post base plate 32 is provided with an electrode post positioning member 321 that cooperates with the electrode post positioning part 22.

[0144] By providing a cover plate positioning part 21 and a terminal post positioning part 22 on the lower partition 20, and cooperating with the cover plate positioning part 11 and the terminal post positioning part 321 respectively, the positions of the cover plate 10 and the terminal post assembly 30 can be effectively fixed, enhancing the fixed connection strength between the terminal post assembly 30, the lower partition 20 and the cover plate 10, improving the stability of the entire cover plate structure 100, preventing the assembly from loosening or shifting during high-rate charging and discharging, enabling the battery 200 to use high-rate terminals for charging and discharging, improving the mechanical strength and thermal stability of the battery 200, thereby improving the safety and service life of the battery 200.

[0145] The presence of the lower partition 20 can absorb and mitigate the impact of external shocks or vibrations on the cover plate 10 and the pole post assembly 30 to a certain extent, extending the product's service life. Simultaneously, the design of the positioning part and positioning holes ensures accurate alignment of the cover plate 10 and the pole post assembly 30 during installation, improving installation precision, reducing the risk of failure due to improper installation, and allowing the cover plate 10, pole post assembly 30, and lower partition 20 to fit tightly together, reducing gaps between components and thus minimizing the impact of the external environment on the internal components. Furthermore, due to the clear positioning of each component, disassembly and reassembly become simpler and faster, facilitating later maintenance and repair.

[0146] This application embodiment also provides a battery 200, including a housing 201, a battery cell 202 and the aforementioned cover structure 100, wherein the battery cell 202 is disposed in the housing 201 and the cover structure 100 covers the housing 201.

[0147] Given that the battery 200 in this embodiment includes the cover structure 100 described in any of the above embodiments, the battery 200 includes the structure and beneficial effects of the cover structure 100, which will not be elaborated further in this embodiment.

[0148] Among them, battery 200 is not limited to lithium batteries; in the future, this technology may be applied to sodium batteries, etc. The preferred embodiment of this application is a lithium-ion battery.

[0149] In another aspect, this application provides an electronic device including the aforementioned battery 200.

[0150] It should be noted that the terms "one embodiment," "embodiment," "exemplary embodiment," "some embodiments," etc., mentioned in the specification indicate that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0151] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "a" or "the" can also be understood to convey either singular or plural usage.

[0152] It should be readily understood that the terms “on,” “above,” and “on top of” in this application should be interpreted in the broadest possible sense, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on something” but also “on something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0153] Furthermore, for ease of explanation, spatially relative terms such as "below," "below," "under," "above," and "above" may be used to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation other than those shown in the figures. The device may have other orientations (rotated 90° or in other orientations), and the spatially relative descriptive terms used herein may be interpreted accordingly.

[0154] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery, characterized in that, include: case; A battery cell, wherein the battery cell is disposed within the housing; A cover plate structure, the cover plate structure including a cover plate, an pole post assembly and a lower partition plate; The cover plate covers the housing, and the cover plate is provided with pole mounting holes; The electrode assembly includes an electrode body and an electrode base plate. The electrode base plate is located on the side of the cover plate close to the battery cell, and the electrode body is located on the side of the cover plate away from the battery cell, and passes through the electrode mounting hole and is connected to the electrode base plate. The lower partition is disposed between the cover plate and the pole base plate. The lower partition has a cover plate positioning part on the side facing the cover plate and a pole positioning part on the side facing the pole base plate. The cover plate has a cover plate positioning component that cooperates with the cover plate positioning part, and the pole base plate has a pole positioning component that cooperates with the pole positioning part.

2. The battery according to claim 1, characterized in that, The cover plate structure also includes a collector plate, which is located on the side of the pole post base plate away from the lower partition plate. Along the length of the pole post base plate, the two side edges of the pole post base plate are welded to the collector plate.

3. The battery according to claim 2, characterized in that, The lower partition is provided with an abutting post on the side facing the collector plate, and the abutting post abuts against the collector plate.

4. The battery according to claim 2, characterized in that, The lower partition plate is provided with an electrode post hole, through which the electrode post body passes. The lower partition plate is provided with a connecting groove on the side facing the electrode post base plate. The connecting groove communicates with the electrode post hole and extends to the edge of the lower partition plate.

5. The battery according to claim 4, characterized in that, The connecting groove extends through the pole positioning part to form a connecting channel in the pole positioning part.

6. The battery according to claim 5, characterized in that, The lower partition plate has a thinning groove on the side facing the collector plate. In the thickness direction of the lower partition plate, the thinning groove overlaps with the edge of the pole base plate, and the connecting groove communicates with the thinning groove.

7. The battery according to claim 6, characterized in that, The cover plate structure is circular, the arc length of the welding area between the pole base plate and the collector plate is L1, the arc length of the thinning groove is L2, and the perimeter of the collector plate is L3, wherein L1, L2, and L3 satisfy: L1 < L2; and / or 0.2L3 ≤ L1 ≤ 0.7L3.

8. The battery according to claim 6, characterized in that, Along the thickness direction of the lower partition, the depth of the thinning groove is h2, where h2 satisfies: h2>0.5mm.

9. The battery according to claim 1, characterized in that, The pole body includes a plate part and a column part connected together. The plate part is located on the other side of the cover plate. The column part passes through the cover plate and is connected to the pole base plate. The pole base plate has a central hole, and the column part passes through the central hole.

10. The battery according to claim 1, characterized in that, Along the thickness direction of the cover plate, the depth of the cover plate positioning member is h, the height of the cover plate positioning part is h1, and the thickness of the cover plate is H, wherein h, h1, and H satisfy: 0.5mm≤h≤0.8H; and / or 0.6h≤h1≤h.

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