Pole column and forming process thereof, battery cell cover plate assembly and battery cell

Abstract

The invention relates to the technical field of batteries, and discloses a pole column and a forming process thereof, a battery cell cover plate assembly and a battery cell. The pole forming process comprises the following steps: stamping and blanking a conductive composite board along a Z direction to obtain a pole body; wherein the pole body comprises a first conductive section and a second conductive section; wrapping and limiting the first conductive section, and extruding and expanding the local part of one end, far away from the first conductive section, of the second conductive section along the Z direction, so that an annular flange is formed on the side wall of the second conductive section on the X-Y plane; stamping and stretching the local part of the annular flange to enable the free end of the annular flange to form a pole turnup; wherein the pole turnup comprises a first turnup and a second turnup which are connected with each other, the first turnup extends towards the direction far away from the second conductive section along the Z direction, the first turnup and the first conductive section are arranged at an interval, and the second turnup extends towards the direction far away from the first conductive section. The pole prepared by the invention can reduce heat transferred to the upper plastic, and the insulating property of the pole is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of battery technology, specifically to an electrode post and its molding process, a cell cover assembly, and a cell. Background Technology

[0002] In existing battery cell cover assembly structures, the terminal post is typically directly bonded to the upper plastic component for insulation and sealing. However, under extreme conditions such as short circuits, the high temperature generated by the terminal post can be rapidly conducted to the upper plastic component. Conventional plastic materials have limited heat resistance; when the temperature exceeds 250°C, the upper plastic component is prone to melting, deformation, or even ablation failure. Once the upper plastic component fails, it loses its insulating support and limiting function for the terminal post, easily leading to direct contact between the terminal post and the battery cell cover, further exacerbating the short circuit and ultimately causing serious safety issues such as battery cell fire and thermal runaway. Therefore, how to prevent the high temperature of the terminal post from conducting heat to the upper plastic component, preventing premature failure of the upper plastic component under extreme conditions such as short circuits, and improving the safety and pass rate of the battery cell in national standard short circuit tests has become an urgent technical problem to be solved in this field. Summary of the Invention

[0003] This invention provides an electrode post and its molding process, a cell cover plate assembly, and a cell to solve the problem that the high temperature generated by the electrode post can easily cause the insulation of the upper plastic parts to fail.

[0004] In a first aspect, the present invention provides a pole forming process, comprising: The conductive composite material is punched and blanked along the Z-direction to obtain the electrode body; wherein, the electrode body includes a first conductive segment and a second conductive segment connected along the Z-direction; The first conductive segment is wrapped and limited, and the second conductive segment at the end away from the first conductive segment is locally squeezed and expanded along the Z direction, so that the sidewall of the second conductive segment on the XY plane forms an annular flange. The annular flange is partially stamped and stretched to form a pole flange at the free end of the annular flange; wherein the pole flange includes a first flange and a second flange connected to each other, the first flange extends in the Z direction away from the second conductive segment, and the first flange is spaced apart from the first conductive segment, and the second flange extends in the direction away from the first conductive segment.

[0005] Beneficial Effects: This invention involves stamping and blanking conductive composite sheets, followed by extrusion and stretching operations on the resulting electrode body. This creates electrode flange structures spaced apart from the first conductive section. This process increases the gap between the plastic on the battery cell and the main current-carrying area of ​​the electrode without reducing the electrode's current-carrying capacity. This effectively reduces heat transfer to the upper plastic, ensuring stable and reliable insulation performance. Specifically, the first and second conductive sections constitute the main current-carrying area of ​​the electrode, the primary heat-generating area when current flows through it. By increasing the distance between this heat-generating area and the upper plastic through electrode flanges, heat conduction is blocked, preventing aging, deformation, and insulation failure of the upper plastic due to prolonged exposure to high temperatures. This improves the overall insulation safety and operational stability of the electrode and the battery cell. Furthermore, the electrode molding process of the present invention enables the electrode flange to be integrally formed with the electrode body, which not only improves the overall mechanical strength and connection stability of the electrode, but also reduces the contact resistance caused by the combination of multiple components, ensuring the stability of the electrode's conductivity, and thus improving the reliability and service life of the electrode and the entire cell cover assembly.

[0006] In one optional embodiment, the step of wrapping and limiting the first conductive segment, and locally extruding and expanding the second conductive segment away from the first conductive segment along the Z direction to form an annular flange on the sidewall of the second conductive segment in the XY plane, includes: The first mold is used to wrap and limit the first conductive segment. Along the Z direction, the first mold is provided with a first groove, and the first mold is wrapped around the outer periphery of the first conductive segment by means of the first groove. The second mold is abutted against the end of the second conductive segment away from the first conductive segment, while the cross-sectional area of ​​the second conductive segment in the XY plane is smaller than the cross-sectional area of ​​the second mold in the XY plane; along the Z direction, the second mold is provided with a second groove, the second groove is arranged opposite to the second conductive segment, while the cross-sectional area of ​​the second groove in the XY plane is smaller than the cross-sectional area of ​​the second conductive segment in the XY plane; Along the Z direction, the first mold and the second mold are used to locally extrude the second conductive segment at the end away from the first conductive segment, so that the sidewall of the second conductive segment on the XY plane forms the annular flange, and at the same time, the corresponding area of ​​the second conductive segment and the second groove forms a connecting segment.

[0007] Beneficial Effects: This invention achieves controllable forming of the annular flange through the cooperation of the first and second molds, ensuring the standardization of the electrode structure and further improving the operability and stability of the process. Specifically, the first mold precisely wraps and limits the first conductive section through the first groove, effectively preventing the electrode body from shifting or deforming during the extrusion and expansion process, ensuring the structural integrity of the main flow area of ​​the electrode, and thus ensuring that the flow capacity of the electrode is not affected. The second mold, through reasonable size matching with the second conductive section and utilizing the difference in cross-sectional area design, allows the force during extrusion and expansion to be concentrated on the target area of ​​the second conductive section, promoting uniform forming of the annular flange and avoiding defects such as uneven flange thickness and sidewall damage, laying a good foundation for the subsequent stamping and stretching of the electrode flange. At the same time, the connecting section formed during the extrusion and expansion process can ensure the assembly dimensions of the electrode in the cell cover assembly, ensuring the fitting accuracy of the electrode and the various components of the cell cover assembly. Furthermore, this mold assembly method eliminates the need for additional positioning and fixing structures, simplifying the process steps, reducing production difficulty and costs, and providing strong controllability in the molding process. This facilitates the large-scale and standardized production of the pole pieces, balancing production efficiency and product quality, and providing a reliable guarantee for the subsequent forming of the pole piece flange and the improvement of overall insulation performance.

[0008] In one optional embodiment, the step of partially stamping and stretching the annular flange to form a pole flange at the free end of the annular flange includes: The first conductive segment is wrapped and limited by a third mold. The third mold is provided with an annular protrusion extending toward the annular flange, so that the annular protrusion is sleeved on the outer periphery of the first conductive segment and abuts against the annular flange. The fourth mold abuts against the side of the annular flange away from the annular protrusion; the fourth mold is provided with a third groove, and the annular protrusion is inserted into the third groove along the Z direction, and a gap is left between the annular protrusion and the groove wall of the third groove on the XY plane; Along the Z direction, the third and fourth dies are used to stamp and stretch a portion of the annular flange, so that the free end of the annular flange forms the pole flange.

[0009] Beneficial Effects: This invention, through the cooperation of the third and fourth molds, achieves controllable and uniform forming of the electrode post flange, ensuring the consistency and integrity of the flange structure while further enhancing the insulation protection effect and overall structural reliability of the electrode post. Specifically, the third mold uses an annular protrusion to wrap and limit the first conductive section, while simultaneously abutting the annular protrusion against the annular flange. This effectively prevents the electrode post body from shifting or deforming during stamping and stretching, and also precisely positions the annular flange, ensuring that the stamping and stretching force is concentrated on the free end of the annular flange, avoiding forming defects such as flange skewing, wrinkles, and uneven thickness. The cooperation design of the third groove of the fourth mold with the annular protrusion of the third mold provides reasonable space for the annular protrusion to move, and also guides the stretching and forming of the annular flange. This ensures that the first and second flanges of the electrode post are precisely formed according to the design angle and size, and that the distance between the first flange and the first conductive section meets the design requirements. This fully leverages the core function of the electrode post flange in increasing the distance between the main current flow area of ​​the electrode post and the upper plastic, and in blocking heat conduction.

[0010] In one alternative implementation, in the XY plane, the first flange has a first surface close to the first conductive segment and a second surface away from the first conductive segment; The step of stamping and stretching a portion of the annular flange along the Z-direction using the third and fourth dies to form a pole flange at the free end of the annular flange includes: In the XY plane, the interval between the first flange and the first conductive segment is defined as 'a', where 'a' ranges from 2mm to 7mm; the angle between the first surface and the side of the annular flange closest to the first conductive segment is defined as 'A', where 'A' ranges from 90.5° to 100°; and the angle between the second surface and the side of the annular flange closest to the first conductive segment is defined as 'B', where 'B' ranges from 90.5° to 100°. Along the Z direction, the height difference between the second flange and the annular flange on the side away from the first conductive segment is defined as f, where f ranges from 1.5mm to 5mm; the thickness of the second flange is defined as b, where b ranges from 0.5mm to 1.5mm.

[0011] Beneficial effects: This invention limits the interval 'a' between the first flange and the first conductive section to 2mm ≤ a ≤ 7mm. This value effectively increases the safe distance between the main current-carrying area of ​​the electrode post and the upper plastic, reducing heat conduction efficiency and preventing the upper plastic from aging and insulation failure due to high temperatures. It also avoids the problem of redundant overall electrode post volume caused by excessive spacing, and prevents process problems such as mold bursting caused by excessively thin mold walls due to insufficient spacing. Limiting the included angles A and B to the chamfer range of 90.5° ≤ A ≤ 100° and 90.5° ≤ B ≤ 100°, compared to a right-angle structure design, eliminates the risk of stress concentration and prevents stress on the flange during stamping and long-term use of the battery cell. The design ensures that cracking and breakage can occur while still meeting the demolding requirements after stamping, and also prevents excessive angles from occupying too much internal space of the battery cell. Limiting the height difference f between the second flange and the annular flange to 1.5mm≤f≤5mm effectively avoids the assembly compatibility between the terminal post and other structures in the battery cell cover assembly being too small, while also preventing the terminal post flange from wrinkling and cracking during stamping due to excessive height difference. Limiting the thickness b of the second flange to 0.5mm≤b≤1.5mm avoids the problem of the flange being prone to cracking due to insufficient thickness and insufficient structural strength after assembly into the cover plate, while also preventing excessive thickness from occupying too much height space and affecting the overall structural layout of the battery cell.

[0012] In one optional embodiment, the step of stamping and stretching a portion of the annular flange along the Z-direction using the third and fourth dies to form the pole flange at the free end of the annular flange includes: The connection between the connecting segment and the annular flange forms a stepped surface; in the XY plane, the width of the stepped surface is defined as e, and the value of e is in the range of 0.5mm≤e≤2mm; along the Z direction, the length of the connecting segment is defined as d, and the value of d is in the range of 0.8mm≤d≤1.8mm.

[0013] Beneficial effects: This invention limits the width e of the stepped surface at the connection between the connecting section and the annular flange to 0.5mm≤e≤2mm, and the length d of the connecting section along the Z direction to 0.8mm≤d≤1.8mm. This provides sufficient structural support and positioning reference for the assembly connection of the electrode post and other structures in the cell cover assembly, such as the cover plate, ensuring the structural stability after assembly. It also avoids structural redundancy caused by excessively wide stepped surfaces and excessively long connecting sections, reducing the occupation of internal space in the cell and taking into account the miniaturization design requirements of the cell. Furthermore, it prevents insufficient assembly contact area between the electrode post and the cover plate due to excessively narrow stepped surfaces and excessively short connecting sections, which could lead to insufficient connection strength and poor conductive contact. This further improves the structural reliability and conductive stability of the electrode post and cell cover assembly after assembly, providing reliable dimensional assurance for the stable performance of the overall electrode post function.

[0014] In one optional embodiment, along the Z-direction, the first mold and the second mold are used to locally extrude the second conductive segment at the end away from the first conductive segment, so that the sidewall of the second conductive segment in the XY plane forms the annular flange, and at the same time, the corresponding area of ​​the second conductive segment and the second groove forms a connecting segment, including: Along the Z direction, the thickness of the annular flange and the connecting segment is defined as c, where the value of c ranges from 0.8mm to 1.8mm.

[0015] Beneficial effects: This invention limits the thickness and c of the annular flange and connecting section to 0.8mm≤c≤1.8mm, which not only effectively improves the breakdown resistance of this area and avoids the problem of easy breakdown and loss of conductivity stability at the weld due to excessive thickness, but also ensures the conductivity stability and safety of use after the electrode post is welded to the connecting piece or electrode tab; at the same time, it can also prevent structural redundancy caused by excessive thickness, reduce the occupation of internal space of the battery cell, and meet the requirements of miniaturized battery cell design.

[0016] In one optional embodiment, the first conductive segment is made of aluminum, the second conductive segment is made of copper, and the volume of the first conductive segment is V. Al The volume of the second conductive segment is V. Cu V Al With V Cu The relationship between them satisfies V Cu / (V) Cu +V Al ≤0.5.

[0017] Beneficial effects: By quantitatively limiting the volume ratio, this invention not only effectively ensures the interlayer bonding strength of the copper-aluminum composite plate (i.e., the bonding strength between the first conductive segment and the second conductive segment), avoiding problems such as copper-aluminum delamination and cracking during stamping, assembly, and long-term use of the electrode body, but also ensures the overall structural stability and reliability of the electrode. At the same time, it can also reasonably control the amount of copper used, saving precious metal costs while ensuring the performance of the electrode, improving production economy, and achieving synergistic optimization of process feasibility, structural reliability, and cost economy.

[0018] Secondly, the present invention also provides an electrode post, comprising: The electrode body, along the Z direction, has a first conductive segment and a second conductive segment; An annular flange, on the XY plane, surrounds the sidewall of the second conductive segment. The annular flange is provided with a pole flange, which includes a first flange and a second flange connected to each other. The first flange extends in the Z direction away from the second conductive segment, and the first flange is spaced apart from the first conductive segment. The second flange extends in the direction away from the first conductive segment.

[0019] Beneficial effects: By setting electrode flanges at intervals around the periphery of the first conductive section, this invention effectively increases the safe distance between the main current-carrying area of ​​the electrode and insulating components such as the upper plastic, reduces heat conduction efficiency, avoids insulation failure due to high-temperature aging, and improves insulation safety. At the same time, the electrode flange structure composed of the first flange and the second flange can form a stable assembly fit and structural limit with the cell cover assembly, which not only ensures that the electrode assembly is firm and reliable, but also optimizes the overall spatial layout, so that the electrode has good thermal insulation performance, assembly stability and structural compactness.

[0020] Thirdly, the present invention also provides a cell cover assembly, comprising: The cover plate has a pole mounting hole that runs through the Z direction; The aforementioned pole is at least partially installed in the pole mounting hole, at least a portion of the first flange is located inside the pole mounting hole, and the second flange is located outside the pole mounting hole and is disposed opposite to one side surface of the cover plate in the Z direction; The upper plastic includes a first insulating section and a second insulating section connected to each other. The first insulating section is sandwiched between the first flange and the hole wall of the pole mounting hole, and at least a portion of the second insulating section is sandwiched between the second flange and the cover plate.

[0021] Beneficial effects: This invention optimizes the design of the electrode structure and the assembly relationship of the upper plastic. By setting a gap between the electrode body and the upper plastic, the heat generated by the electrode during operation is not easily conducted directly to the upper plastic, effectively reducing the impact of high temperature on the insulation performance of the upper plastic. This avoids problems such as insulation failure, aging and deformation of the upper plastic due to high temperature, and improves the insulation reliability and safety of the cell cover assembly. At the same time, the flanged structure of the electrode increases the contact area and assembly stability between the upper plastic and the electrode and cover, ensuring the overall structural strength and sealing performance of the cell cover assembly, thereby improving the service life and safety performance of the cell and battery pack.

[0022] Fourthly, the present invention also provides a battery cell, comprising: The housing, along the Z direction, has at least one open end; In the aforementioned cell cover assembly, the cover is connected to the housing and seals the opening, and the housing and the cell cover assembly together form an accommodating space; The electrode assembly is disposed within the receiving space and electrically connected to the electrode post.

[0023] Beneficial effects: The battery cell of the present invention includes the battery cell cover assembly as described above, and has all the beneficial technical effects of the battery cell cover assembly, which will not be repeated here. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a flowchart of the pole forming process according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the electrode body before it is extruded and expanded. Figure 3 This is a schematic diagram showing the formation of an annular flange after the electrode body is extruded and expanded. Figure 4 This is a schematic diagram of the annular flange before it is stamped and stretched. Figure 5 This is a schematic diagram showing how a stamped and stretched annular flange forms a pole post flange. Figure 6 This is a schematic diagram of the structure of a pole post according to an embodiment of the present invention; Figure 7 for Figure 6 A cross-sectional view of the pole shown; Figure 8 This is a schematic diagram of the structure of a battery cell cover assembly according to an embodiment of the present invention; Figure 9 for Figure 8 The exploded view of the battery cell cover assembly shown.

[0026] Explanation of reference numerals in the attached figures: 1. Cover plate; 101. Terminal mounting hole; 2. Terminal; 201. Terminal body; 2011. First conductive section; 2012. Second conductive section; 20121. Connecting section; 202. Annular flange; 2021. Stepped surface; 203. Terminal flange; 2031. First flange; 20311. First surface; 20312. Second surface; 2032. Second flange; 3. Upper plastic; 4. First mold; 401. First groove; 5. Second mold; 501. Second groove; 6. Third mold; 601. Annular protrusion; 7. Fourth mold; 701. Third groove; 8. Lower plastic; 9. Welding ring. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] The following is combined with Figures 1 to 9 The following describes embodiments of the present invention. For ease of description thereafter, as... Figure 9 As shown, a spatial rectangular coordinate system is established: the thickness direction of the cell cover assembly extends along the Z direction; the length direction of the cell cover assembly extends along the X direction; and the width direction of the cell cover assembly extends along the Y direction.

[0029] According to embodiments of the present invention, in one aspect, such as Figures 1 to 5 As shown, a pole forming process is provided, including: The conductive composite material is punched and blanked along the Z direction to obtain the electrode body 201; wherein, the electrode body 201 includes a first conductive segment 2011 and a second conductive segment 2012 connected along the Z direction. The first conductive segment 2011 is wrapped and limited, and the second conductive segment 2012 at the end away from the first conductive segment 2011 is locally squeezed and expanded along the Z direction, so that the sidewall of the second conductive segment 2012 on the XY plane forms an annular flange 202. A portion of the annular flange 202 is stamped and stretched to form a pole flange 203 at the free end of the annular flange 202; wherein, the pole flange 203 includes a first flange 2031 and a second flange 2032 connected to each other, the first flange 2031 extends along the Z direction away from the second conductive segment 2012, and the first flange 2031 is spaced apart from the first conductive segment 2011, and the second flange 2032 extends away from the first conductive segment 2011.

[0030] This invention, through stamping and blanking of conductive composite material, and subsequent extrusion and stretching operations on the resulting electrode body 201, forms electrode flanges 203 structures spaced apart from the first conductive section 2011. This process, without reducing the current-carrying capacity of the electrode 2, increases the gap between the upper plastic 3 and the main current-carrying area of ​​the electrode 2 using the electrode flanges 203, effectively reducing heat transfer to the upper plastic 3 and ensuring stable and reliable insulation performance. Specifically, the first conductive section 2011 and the second conductive section 2012 constitute the main current-carrying area of ​​the electrode 2, which is the main heat-generating area when current flows through the electrode 2. By increasing the distance between this heat-generating area and the upper plastic 3 through the electrode flanges 203, heat conduction can be blocked, preventing the upper plastic 3 from aging, deforming, and failing due to long-term exposure to high temperatures, thus improving the insulation safety and operational stability of the electrode 2 and the entire battery cell. Furthermore, the electrode forming process in this embodiment of the invention enables the electrode flange 203 and the electrode body 201 to be integrally formed, which not only improves the overall mechanical strength and connection stability of the electrode 2, but also reduces the contact resistance caused by the combination of multiple components, ensuring the stability of the conductivity of the electrode 2, thereby improving the reliability and service life of the electrode 2 and the entire cell cover assembly.

[0031] It is understood that in this embodiment, the terminal flange 203 and the second connecting section 20121 are always connected. Therefore, when current flows through the terminal 2, although the terminal flange 203 will generate some heat, the terminal flange 203 is not the main current flow area of ​​the terminal 2, but only a secondary current flow path. Its heat generation is much smaller than the main current flow area formed by the first conductive section 2011 and the second conductive section 2012. Therefore, compared with the conventional design in which the upper plastic 3 is in close contact with the main current flow area of ​​the terminal 2, the slight heat generation of the terminal flange 203 in this embodiment will not affect the insulation performance of the upper plastic 3, nor will it cause the upper plastic 3 to age at high temperature or fail to maintain insulation.

[0032] Furthermore, in this embodiment, the electrode flange 203 is connected to the second conductive segment 2012 via an annular flange 202 at one end near the second conductive segment 2012. Therefore, to reduce the heat generation of the electrode flange 203 and minimize its impact on the upper plastic 3, the thickness of the annular flange 202 at the end near the second conductive segment 2012 can be rationally reduced. This reduces the conductive cross-sectional area of ​​the connection, decreases the current flowing through the electrode flange 203, and thus reduces the heat generation of the electrode flange 203. Simultaneously, since this area is only the transition region between the electrode flange 203 and the second conductive segment 2012, rationally reducing the thickness will not affect the current-carrying capacity and structural strength of the main current-carrying area of ​​the electrode 2, nor will it damage the supporting role of the annular flange 202 in the subsequent forming of the electrode flange 203.

[0033] It should be noted that the reason why the electrode flange 203 is set as the first flange 2031 and the second flange 2032 with an angle in this embodiment is because the electrode 2 needs to cooperate with other structures of the cell cover assembly to make the cell cover assembly a whole. Specifically, along the Z-direction, from the first conductive segment 2011 to the second conductive segment 2012, the periphery of the pole post 2 is typically fitted with an upper plastic 3, a cover plate 1, a lower plastic 8, and a welding ring 9. Part of the lower plastic 8 is sandwiched between the welding ring 9 and the cover plate 1. After the welding ring is welded to the second conductive segment 2012, the first flange 2031 can abut against the corresponding part of the upper plastic 3, which can both achieve the assembly and positioning of the upper plastic 3 and rely on its own structure to block the heat of the main current flow area of ​​the pole post 2 from being transferred to the upper plastic 3, thus ensuring its insulation performance. The second flange 2032 can be attached to the cover plate 1 through part of the upper plastic 3, forming a double limit in the axial and radial directions. Combined with the welding and fixing of the welding ring and the second conductive segment 2012, a stable connection is achieved between the pole post 2 and the cover plate 1. At the same time, through the structural support of the second flange 2032, the lower plastic is tightly sandwiched between the welding ring and the cover plate 1, preventing the lower plastic from shifting or loosening during assembly or use.

[0034] It should be further noted that the conductive composite plate in this embodiment refers to a composite plate with conductive properties made of at least two materials. For example, this embodiment uses a copper-aluminum composite plate, which is composed of an aluminum layer corresponding to the first conductive segment 2011 and a copper layer corresponding to the second conductive segment 2012. The two layers are firmly bonded together through a composite process, which retains the characteristics of aluminum, such as light weight and good structural adaptability, while also having the advantages of copper, such as excellent conductivity and good welding effect. This can meet the functional requirements of different parts of the pole 2. At the same time, the integrated composite structure ensures the overall structural stability and conductive continuity of the pole 2, and is compatible with the integrated molding process requirements of subsequent extrusion expansion, stamping and stretching.

[0035] Furthermore, such as Figure 2 and Figure 3 As shown, the first conductive segment 2011 is wrapped and limited, and the second conductive segment 2012 at the end away from the first conductive segment 2011 is locally extruded and expanded along the Z direction, so that the sidewall of the second conductive segment 2012 in the XY plane forms an annular flange 202, including: The first mold 4 is used to wrap and limit the first conductive segment 2011. Along the Z direction, the first mold 4 is provided with a first groove 401. The first mold 4 is wrapped around the outer periphery of the first conductive segment 2011 by means of the first groove 401. The second mold 5 is abutted against the end of the second conductive segment 2012 away from the first conductive segment 2011, while the cross-sectional area of ​​the second conductive segment 2012 in the XY plane is smaller than the cross-sectional area of ​​the second mold 5 in the XY plane; along the Z direction, the second mold 5 is provided with a second groove 501, and the second groove 501 is arranged opposite to the second conductive segment 2012, while the cross-sectional area of ​​the second groove 501 in the XY plane is smaller than the cross-sectional area of ​​the second conductive segment 2012 in the XY plane; Along the Z direction, the first mold 4 and the second mold 5 are used to locally compress and expand the material at the end of the second conductive segment 2012 away from the first conductive segment 2011, so that the sidewall of the second conductive segment 2012 on the XY plane forms an annular flange 202, and at the same time, the corresponding area of ​​the second conductive segment 2012 and the second groove 501 forms a connecting segment 20121.

[0036] This invention, through the cooperation of the first mold 4 and the second mold 5, achieves controllable forming of the annular flange 202, ensuring the standardization of the pole post 2 structure and further improving the operability and stability of the process. Specifically, the first mold 4 precisely wraps and limits the first conductive segment 2011 through the first groove 401, effectively preventing the pole post body 201 from shifting or deforming during the extrusion and expansion process, ensuring the structural integrity of the main flow area of ​​the pole post 2, and thus ensuring that the flow capacity of the pole post 2 is not affected; the second mold 5, through reasonable size matching with the second conductive segment 2012, utilizes the design of the difference in cross-sectional area to concentrate the force during the extrusion and expansion on the target area of ​​the second conductive segment 2012, promoting the uniform forming of the annular flange 202, avoiding defects such as uneven flange thickness and sidewall damage, and laying a good foundation for the subsequent stamping and stretching of the pole post flange 203. Meanwhile, the connecting section 20121 formed during the extrusion and expansion process ensures the assembly dimensions of the electrode post 2 in the cell cover assembly, guaranteeing the fitting accuracy between the electrode post 2 and other components of the cell cover assembly. Furthermore, this mold fitting method eliminates the need for additional positioning and fixing structures, simplifying the process steps, reducing production difficulty and cost, and providing strong controllability in the molding process. This facilitates the large-scale, standardized production of the electrode post 2, balancing production efficiency and product quality, and providing a reliable guarantee for the subsequent molding of the electrode post flange 203 and the improvement of overall insulation performance.

[0037] Furthermore, such as Figure 4 and Figure 5 As shown, a portion of the annular flange 202 is stamped and stretched to form a pole flange 203 at the free end of the annular flange 202, including: The third mold 6 is used to wrap and limit the first conductive segment 2011. The third mold 6 is provided with an annular protrusion 601 extending toward the annular flange 202, so that the annular protrusion 601 is sleeved on the outer periphery of the first conductive segment 2011 and abuts against the annular flange 202. The fourth mold 7 abuts against the side of the annular flange 202 away from the annular protrusion 601; the fourth mold 7 is provided with a third groove 701, and the annular protrusion 601 is inserted into the third groove 701 along the Z direction, and a gap is left between the annular protrusion 601 and the groove wall of the third groove 701 on the XY plane. Along the Z direction, the third mold 6 and the fourth mold 7 are used to locally stamp and stretch the annular flange 202, so that the free end of the annular flange 202 forms a pole post flange 203.

[0038] This embodiment achieves controllable and uniform forming of the electrode flange 203 through the cooperation of the third mold 6 and the fourth mold 7. This ensures the consistency and integrity of the electrode flange 203 structure and further enhances the insulation protection effect and overall structural reliability of the electrode 2. Specifically, the third mold 6 uses the annular protrusion 601 to wrap and limit the first conductive segment 2011, while simultaneously abutting the annular protrusion 601 against the annular flange 202. This effectively prevents the electrode body 201 from shifting or deforming during the stamping and stretching process, and also provides precise positioning for the annular flange 202. This ensures that the stamping and stretching force is concentrated on the free end of the annular flange 202, avoiding forming defects such as flange skewing, wrinkles, and uneven thickness. The third groove 701 of the fourth mold 7 and the third mold 6... The design of the annular protrusion 601 not only provides reasonable space for its movement, but also guides the stretching and forming of the annular flange 202. This ensures that the first flange 2031 and the second flange 2032 of the pole post flange 203 can be precisely formed according to the design angle and size, and ensures that the distance between the first flange 2031 and the first conductive section 2011 meets the design requirements. This fully leverages the core function of the pole post flange 203 in increasing the distance between the main flow area of ​​the pole post 2 and the upper plastic 3, and in blocking heat conduction.

[0039] Furthermore, this mold assembly method is convenient to operate and highly controllable, requiring no additional positioning or correction structures, simplifying the process steps, reducing production difficulty, and enabling the integral molding of the electrode flange 203 and the electrode body 201. This further enhances the overall mechanical strength and structural stability of the electrode 2, avoids the contact resistance risks caused by the combination of multiple components, ensures the stable conductivity of the electrode 2, and ensures that the flange can closely fit the relevant structures of the cell cover assembly. This further improves the assembly accuracy and connection stability of the electrode 2 and the cell cover assembly, providing strong protection for the insulation safety and long-term operational reliability of the electrode 2 and the cell as a whole.

[0040] Furthermore, such as Figure 7 As shown, on the XY plane, the first flange 2031 has a first surface 20311 close to the first conductive segment 2011 and a second surface 20312 away from the first conductive segment 2011; Along the Z-direction, the annular flange 202 is partially stamped and stretched using the third die 6 and the fourth die 7, forming a pole flange 203 at the free end of the annular flange 202, including: On the XY plane, the interval between the first flange 2031 and the first conductive segment 2011 is defined as 'a', with a value ranging from 2mm to 7mm; the angle between the first surface 20311 and the surface of the annular flange 202 near the first conductive segment 2011 is defined as 'A', with a value ranging from 90.5° to 100°; and the angle between the second surface 20312 and the surface of the annular flange 202 near the first conductive segment 2011 is defined as 'B', with a value ranging from 90.5° to 100°. Along the Z direction, the height difference between the second flange 2032 and the annular flange 202 on the side away from the first conductive segment 2011 is defined as f, and the value of f is in the range of 1.5mm≤f≤5mm; the thickness of the second flange 2032 is defined as b, and the value of b is in the range of 0.5mm≤b≤1.5mm.

[0041] In this embodiment of the invention, the interval 'a' between the first flange 2031 and the first conductive segment 2011 is limited to 2mm ≤ a ≤ 7mm. This value effectively increases the safe distance between the main current-carrying area of ​​the electrode post 2 and the upper plastic 3, reducing heat conduction efficiency and preventing the upper plastic 3 from aging and insulation failure due to high temperatures. It also avoids the problem of redundant overall volume of the electrode post 2 caused by excessive spacing, and prevents process problems such as mold bursting caused by excessively thin mold walls due to insufficient spacing. The included angles A and B are both limited to the chamfer range of 90.5° ≤ A ≤ 100° and 90.5° ≤ B ≤ 100°. Compared with the right-angle structure design, this can eliminate the hidden danger of stress concentration and prevent the flange from opening during stamping and long-term use of the battery cell. The design is designed to prevent cracking and breakage while meeting the demolding requirements after stamping, and also to prevent excessive angles from occupying too much internal space of the battery cell. The height difference f between the second flange 2032 and the annular flange 202 is limited to 1.5mm≤f≤5mm, which can effectively avoid the assembly compatibility between the pole post 2 and other structures in the battery cell cover assembly if the height difference is too small, and also prevent the forming defects of wrinkling and cracking of the pole post flange 203 during the stamping process if the height difference is too large. The thickness b of the second flange 2032 is limited to 0.5mm≤b≤1.5mm, which can avoid the problem that the flange is prone to cracking if the thickness is too small and the structural strength is insufficient after assembly into the cover plate 1, and also prevent the thickness from occupying too much height space and affecting the overall structural layout of the battery cell.

[0042] It should be noted that, as Figure 7 As shown, in this embodiment, the end of the first flange 2031 connected to the second flange 2032 is inclined away from the first conductive segment 2011. Therefore, in this embodiment, the range of the interval a is limited to the interval between the end of the first flange 2031 close to the first conductive segment 2011 and the first conductive segment 2011 in the XY plane.

[0043] It is understood that in this embodiment, the value of 'a' can be 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, or any value between two of these; the value of included angle A in this embodiment can be 90.5°, 92°, 93°, 94°, 95°, 96°, 97°, 98°, 99°, 100°, or any value between two of these; the value of included angle B can be 90.5°, 92°, 93°, 94°, 95°, 96°, 97°, 98°, 99°, 100°, or any value between two of these; in this embodiment, f... The value of b can be 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm or any value between the two; in this embodiment, the value of b can be 0.5mm, 1mm, 1.2mm, 1.25mm, 1.3mm, 1.35mm, 1.44mm, 1.5mm or any value between the two.

[0044] In some embodiments, such as Figure 7 As shown, along the Z-direction, the annular flange 202 is partially stamped and stretched using the third mold 6 and the fourth mold 7, forming a pole flange 203 at the free end of the annular flange 202, including: The connection between the connecting segment 20121 and the annular flange 202 forms a stepped surface 2021; on the XY plane, the width of the stepped surface 2021 is limited to e, and the value of e is 0.5mm≤e≤2mm; along the Z direction, the length of the connecting segment 20121 is limited to d, and the value of d is 0.8mm≤d≤1.8mm.

[0045] In this embodiment of the invention, the width e of the stepped surface 2021 at the connection between the connecting segment 20121 and the annular flange 202 is limited to 0.5mm≤e≤2mm, and the length d of the connecting segment 20121 along the Z direction is limited to 0.8mm≤d≤1.8mm. This provides sufficient structural support and positioning reference for the assembly connection of the pole post 2 and other structures in the cell cover assembly, such as the cover plate 1, ensuring the structural stability after assembly. It also avoids structural redundancy caused by an excessively wide stepped surface 2021 or an excessively long connecting segment 20121, reducing the occupation of internal space in the cell and taking into account the miniaturization design requirements of the cell. Furthermore, it prevents insufficient assembly contact area between the pole post 2 and the cover plate 1 due to an excessively narrow stepped surface 2021 or an excessively short connecting segment 20121, which could lead to insufficient connection strength and poor conductive contact. This further improves the structural reliability and conductive stability of the pole post 2 after assembly with the cell cover assembly, providing reliable dimensional assurance for the stable performance of the overall function of the pole post 2.

[0046] It is understood that in this embodiment, the value of e can be 0.5mm, 1mm, 1.2mm, 1.25mm, 1.3mm, 1.35mm, 1.44mm, 1.5mm, 1.7mm, 1.9mm, 2mm or any value between two of these; and the value of d in this embodiment can be 0.8mm, 1mm, 1.2mm, 1.25mm, 1.3mm, 1.35mm, 1.44mm, 1.5mm, 1.7mm, 1.8mm or any value between two of these.

[0047] In some embodiments, such as Figure 7 As shown, along the Z-direction, the first mold 4 and the second mold 5 are used to locally compress and expand the second conductive segment 2012 at the end away from the first conductive segment 2011, so that the sidewall of the second conductive segment 2012 on the XY plane forms an annular flange 202, and at the same time, the corresponding area of ​​the second conductive segment 2012 and the second groove 501 forms a connecting segment 20121, including: Along the Z direction, the thickness of the annular flange 202 and the connecting section 20121 is limited to c, and the value of c is in the range of 0.8mm≤c≤1.8mm.

[0048] In this embodiment of the invention, the thickness and c of the annular flange 202 and the connecting section 20121 are limited to 0.8mm≤c≤1.8mm. This not only effectively improves the breakdown resistance of this area and avoids the problem of easy breakdown and loss of conductivity stability at the weld due to excessive thickness, but also ensures the conductivity stability and safety of use after the electrode post 2 is welded to the connecting piece or electrode tab. At the same time, it can also prevent structural redundancy caused by excessive thickness, reduce the occupation of internal space of the battery cell, and meet the requirements of miniaturized battery cell design.

[0049] It is understood that in this embodiment, the value of c can be 0.8mm, 1mm, 1.2mm, 1.25mm, 1.3mm, 1.35mm, 1.44mm, 1.5mm, 1.7mm, 1.8mm or any value range between the two.

[0050] In some embodiments, the first conductive segment 2011 is made of aluminum, the second conductive segment 2012 is made of copper, and the volume of the first conductive segment 2011 is V. Al The volume of the second conductive segment 2012 is V. Cu V Al With V Cu The relationship between them satisfies V Cu / (V) Cu +V Al ≤0.5.

[0051] By quantitatively limiting the volume ratio, this invention not only effectively ensures the interlayer bonding strength of the copper-aluminum composite plate (i.e., the bonding strength between the first conductive segment 2011 and the second conductive segment 2012), avoiding problems such as copper-aluminum delamination and cracking in the electrode body 201 during stamping, assembly, and long-term use, but also ensures the overall structural stability and reliability of the electrode 2; at the same time, it can also reasonably control the amount of copper used, saving precious metal costs while ensuring the performance of the electrode 2, improving production economy, and achieving synergistic optimization of process feasibility, structural reliability, and cost economy.

[0052] It should be noted that, in this embodiment, the volume V of the second conductive segment 2012 is... Cu It can be the volume of the second conductive segment 2012 in its initial state, or the sum of the volumes of the various structures formed by the second conductive segment 2012 after the second conductive segment 2012 is subjected to extrusion, expansion and stamping stretching operations.

[0053] The technical effects of the present invention will be described below with reference to some embodiments and comparative examples: Table 1

[0054] As shown in the table above, by comparing the parameters of 6 sets of embodiments and 6 sets of comparative examples, the rationality and effectiveness of the key design parameters a (the interval between the first flange 2031 and the first conductive segment 2011), f (the height difference between the second flange 2032 and the annular flange 202), and A / B (the angle between the surface of the first flange 2031 and the corresponding surface of the annular flange 202) of the pole flange 203 are verified within the range of 2mm≤a≤7mm, 1.5mm≤f≤5mm, 90.5°≤A≤100° and 90.5°≤B≤100°. In the above embodiments, all parameters are within the defined range, and the pole post flange 203 achieves good forming effect. In the above comparative examples, if any parameter exceeds the defined range (e.g., a is too small, f is too large, A / B is less than 90.5°), various forming defects will occur, including thin mold wall thickness and insufficient strength, poor appearance of copper material after stretching, tensile cracks in the copper edge, and problems such as flange deformation and copper wire after demolding. Moreover, the more serious the deviation of some parameters from the range, the more prominent the forming defects will be.

[0055] It should be noted that the above embodiments and comparative examples are based on the premise that the material of the second conductive segment 2012 is copper, and are forming experiments conducted using the electrode forming process defined in the embodiments of the present invention. By controlling a single variable and adjusting the key parameter values ​​of the electrode flange 203, the actual influence of the parameter range defined in the present invention on the forming effect of the electrode flange 203 is verified. The descriptions of copper involved in Comparative Examples 1 to 6 can be understood as the defects and problems of the electrode flange 203 formed after stamping and stretching the annular flange 202 when the materials of the second conductive segment 2012 and the annular flange 202 are copper.

[0056] According to embodiments of the present invention, such as Figure 6 and Figure 7 As shown, on the other hand, a pole post 2 is also provided, including: pole post body 201 and annular flange 202.

[0057] Specifically, along the Z direction, the electrode body 201 has a first conductive segment 2011 and a second conductive segment 2012; on the XY plane, an annular flange 202 surrounds the side wall of the second conductive segment 2012, and the annular flange 202 is provided with an electrode flange 203, which includes a first flange 2031 and a second flange 2032 connected to each other. The first flange 2031 extends along the Z direction away from the second conductive segment 2012, and the first flange 2031 is spaced apart from the first conductive segment 2011. The second flange 2032 extends away from the first conductive segment 2011.

[0058] In this embodiment of the invention, by providing a flange 203 at intervals around the first conductive segment 2011, the safety distance between the main current-carrying area of ​​the electrode 2 and insulating components such as the upper plastic 3 is effectively increased, heat conduction efficiency is reduced, and insulation components are prevented from failing due to high-temperature aging, thereby improving insulation safety. At the same time, the electrode flange 203 structure composed of the first flange 2031 and the second flange 2032 can form a stable assembly fit and structural limit with the cell cover assembly, which not only ensures that the electrode 2 is firmly and reliably assembled, but also optimizes the overall spatial layout, so that the electrode 2 has good thermal insulation performance, assembly stability and structural compactness.

[0059] According to embodiments of the present invention, such as Figure 8 and Figure 9 As shown, on the other hand, a cell cover assembly is also provided, including: a cover 1, the aforementioned electrode post 2, and an upper plastic 3.

[0060] Specifically, the cover plate 1 is provided with a pole mounting hole 101 extending along the Z direction; at least a portion of the pole 2 is installed in the pole mounting hole 101, at least a portion of the first flange 2031 is located inside the pole mounting hole 101, and the second flange 2032 is located outside the pole mounting hole 101 and is disposed opposite to one side surface of the cover plate 1 in the Z direction; the upper plastic 3 includes a first insulating section and a second insulating section connected to each other, the first insulating section is sandwiched between the first flange 2031 and the hole wall of the pole mounting hole 101, and at least a portion of the second insulating section is sandwiched between the second flange 2032 and the cover plate 1.

[0061] This invention optimizes the structure of the electrode post 2 and the assembly relationship of the upper plastic plate 3 by setting a gap between the electrode post body 201 and the upper plastic plate 3. This prevents the heat generated by the electrode post 2 during operation from being directly conducted to the upper plastic plate 3, effectively reducing the impact of the high temperature of the electrode post 2 on the insulation performance of the upper plastic plate 3. This avoids problems such as insulation failure and aging deformation of the upper plastic plate 3 due to high temperature, and improves the insulation reliability and safety of the cell cover assembly. At the same time, the structural design of the electrode post flange 203 can increase the contact area and assembly stability between the upper plastic plate 3 and the electrode post 2 and the cover plate 1, ensuring the overall structural strength and sealing performance of the cell cover assembly, thereby improving the service life and safety performance of the cell and battery pack.

[0062] According to an embodiment of the present invention, another aspect provides a battery cell, comprising: a housing and the aforementioned battery cell cover assembly.

[0063] Specifically, along the Z direction, at least one end of the housing is provided as an opening; the cover plate 1 is connected to the housing and seals the opening, and the housing and the cell cover plate assembly enclose and form an accommodating space; The electrode assembly is located within the housing space and electrically connected to the electrode post 2.

[0064] The battery cell of this embodiment includes the battery cell cover assembly as described above, and has all the beneficial technical effects of the battery cell cover assembly, which will not be repeated here.

[0065] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A pole post forming process, characterized in that, include: The conductive composite material is punched and blanked along the Z-direction to obtain the electrode body; wherein, the electrode body includes a first conductive segment and a second conductive segment connected along the Z-direction; The first conductive segment is wrapped and limited, and the second conductive segment at the end away from the first conductive segment is locally squeezed and expanded along the Z direction, so that the sidewall of the second conductive segment on the XY plane forms an annular flange. The annular flange is partially stamped and stretched to form a pole flange at the free end of the annular flange; wherein the pole flange includes a first flange and a second flange connected to each other, the first flange extends in the Z direction away from the second conductive segment, and the first flange is spaced apart from the first conductive segment, and the second flange extends in the direction away from the first conductive segment.

2. The electrode forming process according to claim 1, characterized in that, The step of wrapping and limiting the first conductive segment, and locally extruding and expanding the second conductive segment away from the first conductive segment along the Z direction to form an annular flange on the sidewall of the second conductive segment in the XY plane, includes: The first mold is used to wrap and limit the first conductive segment. Along the Z direction, the first mold is provided with a first groove, and the first mold is wrapped around the outer periphery of the first conductive segment by means of the first groove. The second mold is abutted against the end of the second conductive segment away from the first conductive segment, while the cross-sectional area of ​​the second conductive segment in the XY plane is smaller than the cross-sectional area of ​​the second mold in the XY plane; along the Z direction, the second mold is provided with a second groove, the second groove is arranged opposite to the second conductive segment, while the cross-sectional area of ​​the second groove in the XY plane is smaller than the cross-sectional area of ​​the second conductive segment in the XY plane; Along the Z direction, the first mold and the second mold are used to locally extrude the second conductive segment at the end away from the first conductive segment, so that the sidewall of the second conductive segment on the XY plane forms the annular flange, and at the same time, the corresponding area of ​​the second conductive segment and the second groove forms a connecting segment.

3. The electrode forming process according to claim 2, characterized in that, The step of partially stamping and stretching the annular flange to form a pole flange at the free end of the annular flange includes: The first conductive segment is wrapped and limited by a third mold. The third mold is provided with an annular protrusion extending toward the annular flange, so that the annular protrusion is sleeved on the outer periphery of the first conductive segment and abuts against the annular flange. The fourth mold abuts against the side of the annular flange away from the annular protrusion; the fourth mold is provided with a third groove, and the annular protrusion is inserted into the third groove along the Z direction, and a gap is left between the annular protrusion and the groove wall of the third groove on the XY plane; Along the Z direction, the third and fourth dies are used to stamp and stretch a portion of the annular flange, so that the free end of the annular flange forms the pole flange.

4. The electrode forming process according to claim 3, characterized in that, In the XY plane, the first flange has a first surface close to the first conductive segment and a second surface away from the first conductive segment; The step of stamping and stretching a portion of the annular flange along the Z-direction using the third and fourth dies to form a pole flange at the free end of the annular flange includes: In the XY plane, the interval between the first flange and the first conductive segment is defined as 'a', where 'a' ranges from 2mm to 7mm; the angle between the first surface and the side of the annular flange closest to the first conductive segment is defined as 'A', where 'A' ranges from 90.5° to 100°; and the angle between the second surface and the side of the annular flange closest to the first conductive segment is defined as 'B', where 'B' ranges from 90.5° to 100°. Along the Z direction, the height difference between the second flange and the annular flange on the side away from the first conductive segment is defined as f, where f ranges from 1.5mm to 5mm; the thickness of the second flange is defined as b, where b ranges from 0.5mm to 1.5mm.

5. The electrode forming process according to claim 3, characterized in that, The step of stamping and stretching a portion of the annular flange along the Z-direction using the third and fourth dies to form the pole flange at the free end of the annular flange includes: The connection between the connecting segment and the annular flange forms a stepped surface; in the XY plane, the width of the stepped surface is defined as e, and the value of e is in the range of 0.5mm≤e≤2mm; along the Z direction, the length of the connecting segment is defined as d, and the value of d is in the range of 0.8mm≤d≤1.8mm.

6. The electrode forming process according to claim 2, characterized in that, Along the Z-direction, the first mold and the second mold are used to locally extrude the second conductive segment at the end away from the first conductive segment, so that the sidewall of the second conductive segment in the XY plane forms the annular flange, and at the same time, the corresponding area of ​​the second conductive segment and the second groove forms a connecting segment, including: Along the Z direction, the thickness of the annular flange and the connecting segment is defined as c, where the value of c ranges from 0.8mm to 1.8mm.

7. The electrode forming process according to any one of claims 1 to 6, characterized in that, The first conductive segment is made of aluminum, the second conductive segment is made of copper, and the volume of the first conductive segment is V. Al The volume of the second conductive segment is V. Cu V Al With V Cu The relationship between them satisfies V Cu / (V) Cu +V Al ≤0.

5.

8. A pole post, characterized in that, include: The electrode body, along the Z direction, has a first conductive segment and a second conductive segment; An annular flange, on the XY plane, surrounds the sidewall of the second conductive segment. The annular flange is provided with a pole flange, which includes a first flange and a second flange connected to each other. The first flange extends in the Z direction away from the second conductive segment, and the first flange is spaced apart from the first conductive segment. The second flange extends in the direction away from the first conductive segment.

9. A cell cover assembly, characterized in that, include: The cover plate has a pole mounting hole that runs through the Z direction; The pole of claim 8 is at least partially installed in the pole mounting hole, at least a portion of the first flange is located inside the pole mounting hole, and the second flange is located outside the pole mounting hole and is disposed opposite to one side surface of the cover plate in the Z direction; The upper plastic includes a first insulating section and a second insulating section connected to each other. The first insulating section is sandwiched between the first flange and the hole wall of the pole mounting hole, and at least a portion of the second insulating section is sandwiched between the second flange and the cover plate.

10. A battery cell, characterized in that, include: The housing, along the Z direction, has at least one open end; According to claim 9, the cell cover plate assembly is connected to the housing and seals the opening, and the housing and the cell cover plate assembly enclose a receiving space. The electrode assembly is disposed within the receiving space and electrically connected to the electrode post.

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