Battery cell, battery, and electric device

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By increasing the current-passing area of the battery cell's terminals and conductive parts, and optimizing the connection structure between the terminals and the casing, the problem of slow charging speed of battery cells was solved, achieving faster charging performance and higher reliability and stability.

CN119404347BActive Publication Date: 2026-05-05CONTEMPORARY AMPEREX TECHNOLOGY CO LTD

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Patent Information

Authority / Receiving Office: CN · China
Patent Type: Patents(China)
Current Assignee / Owner: CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
Filing Date: 2023-03-03
Publication Date: 2026-05-05

AI Technical Summary

Technical Problem

The charging speed of existing battery cells is difficult to improve, which limits the performance of new energy vehicles.

Method used

By increasing the current-carrying area of the first terminal and conductive part of the battery cell, the connection structure between the terminal and the casing is optimized, including setting a limiting platform and a receiving groove, improving the welding space and stability, increasing the current-carrying area of the busbar assembly, simplifying the assembly process, and improving the reliability and stability of the battery cell.

Benefits of technology

It improves the charging speed and reliability of individual battery cells, reduces resistance, enhances welding reliability and stability, and improves the fast-charging performance and volumetric energy density of individual battery cells.

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Abstract

This application discloses a battery cell, a battery, and an electrical device. The battery cell includes a housing assembly and a cell assembly. The housing assembly includes a housing and a first terminal post. The housing has a first wall with a mounting hole. The first terminal post is disposed in the mounting hole and includes a first welding surface. The cell assembly includes an active material coating portion and a conductive portion electrically connected to the active material coating portion. The active material coating portion is housed within the housing. The conductive portion includes a second welding surface in contact with the first welding surface. A portion of the second welding surface is partially welded to a portion of the first welding surface. Using the plane containing the cross-section of the mounting hole as a projection plane, along a direction perpendicular to the projection plane, the outer contour of the projection of the second welding surface on the projection plane is within the range of the outer contour of the projection of the first welding surface on the projection plane. The battery cell according to this application improves the fast-charging performance, reliability, and stability of the battery cell.

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Description

Technical Field

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

[0002] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, batteries, as the power source, play an irreplaceable and crucial role. Typically, a battery consists of multiple individual cells. Currently, it is difficult to improve the charging speed of individual battery cells, which limits the use of vehicles to some extent. Summary of the Invention

[0003] This application aims to solve at least one of the technical problems existing in the related art. To this end, this application proposes a battery cell, a battery, and an electrical device with a faster charging speed.

[0004] In a first aspect, embodiments of this application provide a battery cell, comprising: a housing assembly including a housing and a first terminal post, the housing having a first wall, the first wall having a mounting hole, the first terminal post being disposed in the mounting hole, the first terminal post including a first welding surface; and a cell assembly including an active material coating portion and a conductive portion electrically connected to the active material coating portion, the active material coating portion being housed within the housing, the conductive portion including a second welding surface welded to the first welding surface, a portion of the second welding surface being partially welded to a portion of the first welding surface via the welding portion; wherein, taking the plane containing the cross-section of the mounting hole as the projection plane, along a direction perpendicular to the projection plane, the outer contour of the projection of the second welding surface on the projection plane is within the range of the outer contour of the projection of the first welding surface on the projection plane.

[0005] In the above technical solution, by setting the projection plane with the cross-section of the mounting hole as the projection plane, and along the direction perpendicular to the projection plane, the outer contour of the projection of the second welding surface on the projection plane is located within the outer contour of the projection of the first welding surface on the projection plane. The area of the first pole that can be welded to the conductive part is larger than the area of the conductive part that can be welded to the first pole, so as to achieve the ultra-large setting of the first pole. On the one hand, with the size of the conductive part remaining unchanged, making the first pole larger can ensure the current-carrying area of the conductive part and increase the current-carrying area of the first pole. At the same time, the ultra-large setting of the first pole can make the busbar component electrically connected to the first pole relatively large, so that the area of the busbar component used for electrical connection (e.g., welding) with the first pole can be set larger, which can also increase the current-carrying area of the busbar component. Meanwhile, the increased current-carrying area of the conductive part, the first terminal, and the busbar assembly not only reduces resistance and improves temperature rise during charging and discharging to enhance the reliability of the battery cell, but also increases current to improve the fast-charging performance of the battery cell. On the other hand, the extra-large setting of the first terminal provides a larger welding space, which increases the welding space between the first terminal and the conductive part, and also increases the welding space between the first terminal and the busbar assembly. Therefore, the welding reliability and stability are higher, which can further improve the reliability and stability of the battery cell.

[0006] In some embodiments, the first electrode post includes an electrode post body, a first limiting platform and a second limiting platform. The electrode post body passes through the mounting hole. The first limiting platform and the second limiting platform are disposed at both ends of the electrode post body in a direction perpendicular to the projection plane. The first limiting platform is limited and fitted to the outside of the housing, and the second limiting platform is limited and fitted to the inside of the housing. The end face of the second limiting platform near the cell assembly forms a first welding surface.

[0007] In the above technical solution, the structure of the first pole post includes a pole post body, a first limiting platform and a second limiting platform, which enables the first pole post to be riveted to the housing, facilitating the assembly of the first pole post and the housing, simplifying the manufacturing process, and improving the reliability and stability of the connection between the first pole post and the housing. At the same time, riveting the first pole post to the housing eliminates the need for other connection methods, making it easy to achieve a reliable connection between the first pole post and the housing, which helps to simplify the structure of the housing assembly and the assembly process of the housing assembly.

[0008] In some embodiments, the length dimension of the pole body in the first direction is greater than or equal to 1 / 3 of the length dimension of the first wall in the first direction; and / or, the width dimension of the pole body in the second direction is greater than or equal to 1 / 2 of the width dimension of the first wall in the second direction; and / or, the ratio of the circumference of the pole body that mates with the mounting hole to the circumference of the first wall is in the range of 25% to 40%; and / or, the cross-sectional area of the portion of the pole body that mates with the mounting hole is greater than or equal to 10% of the area of the first wall; and / or, along the axial direction of the mounting hole, the ratio of the thickness dimension of the pole body to the thickness dimension of the first wall is greater than 1 and less than 1.5.

[0009] In the above technical solution, when at least one of the following ratios—the length ratio of the electrode body to the length of the first wall, the width ratio of the electrode body to the width of the first wall, and the perimeter ratio of the electrode body to the mounting hole to the perimeter of the first wall—satisfies the corresponding ranges, the electrode body has a large proportion in both the length and width directions of the first wall, and the size of the part of the electrode body mating with the mounting hole is large. This improves the stability of the riveting between the first electrode and the first wall, ensures the riveting strength of the first electrode, and thus improves the reliability and stability of the battery cell. When the ratio of the cross-sectional area of the electrode body to the area of the first wall is within the above range, the current-carrying area of the first electrode is large, which improves the current-carrying and fast-charging capabilities of the first electrode. When the ratio of the thickness of the electrode body to the thickness of the first wall satisfies the corresponding ranges, it facilitates the reliable mating of the electrode body with the mounting hole, so that the first limiting platform and the second limiting platform are located on the inner and outer sides of the housing, respectively, to achieve smooth riveting of the first electrode and improve the convenience and reliability of riveting.

[0010] In some embodiments, the ratio of the length dimension of the first limiting platform in the first direction to the length dimension of the first wall in the first direction is in the range of 1 / 3 to 1 / 2; and / or, the ratio of the width dimension of the first limiting platform in the second direction to the width dimension of the first wall in the second direction is in the range of 1 / 2 to 3 / 4; and / or, the first limiting platform is columnar, and the ratio of the perimeter of the first limiting platform to the perimeter of the first wall is in the range of 30% to 50%; and / or, the ratio of the cross-sectional area of the first limiting platform to the area of the first wall is in the range of 9% to 25%; and / or, along the axial direction of the mounting hole, the ratio of the thickness dimension of the first limiting platform to the thickness dimension of the first wall is in the range of 0.6 to 1.5.

[0011] In the above technical solution, when at least one of the following ratios—the length of the first limiting platform to the length of the first wall, the width of the first limiting platform to the width of the first wall, and the perimeter of the first limiting platform to the perimeter of the first wall—satisfies the corresponding ranges described above, the proportion of the first limiting platform in the length and width directions of the first wall is large, and the size of the part of the first limiting platform mating with the mounting hole is large. This improves the stability of the riveting between the first electrode post and the first wall, ensures the riveting strength of the first electrode post, and thus improves the reliability and stability of the battery cell. When the ratio of the cross-sectional area of the first limiting platform to the area of the first wall is within the above range, the current-carrying area of the first electrode post is large, which improves the current-carrying and fast-charging capabilities of the first electrode post. When the ratio of the thickness of the first limiting platform to the thickness of the first wall satisfies the corresponding range described above, it helps to prevent the first electrode post from easily separating from the first wall, further improving the riveting reliability. It also helps to reduce the thickness of the portion of the first limiting platform protruding outside the housing, reducing the space occupied by the first electrode post outside the housing, which is beneficial to improving the volumetric energy density of the battery.

[0012] In some embodiments, the ratio of the length dimension of the second limiting platform in the first direction to the length dimension of the first wall in the first direction is in the range of 1 / 3 to 1 / 2; and / or, the ratio of the width dimension of the second limiting platform in the second direction to the width dimension of the first wall in the second direction is in the range of 1 / 2 to 3 / 4; and / or, the second limiting platform is columnar, and the ratio of the perimeter of the second limiting platform to the perimeter of the first wall is in the range of 30% to 50%; and / or, the ratio of the cross-sectional area of the second limiting platform to the area of the first wall is in the range of 9% to 25%; and / or, along the axial direction of the mounting hole, the ratio of the thickness dimension of the second limiting platform to the thickness dimension of the first wall is in the range of 0.6 to 1.5.

[0013] In the above technical solution, when at least one of the following ratios—the length ratio of the second limiting platform to the length of the first wall, the width ratio of the second limiting platform to the width of the first wall, and the circumference ratio of the outer perimeter of the second limiting platform to the circumference of the first wall—satisfies the corresponding ranges, the proportion of the second limiting platform in the length and width directions of the first wall is large, and the size of the part of the second limiting platform mating with the mounting hole is large. This improves the stability of the riveting between the first electrode post and the first wall, ensures the riveting strength of the first electrode post, and thus improves the reliability and stability of the battery cell. When the ratio of the cross-sectional area of the second limiting platform to the area of the first wall is within the above range, the current-carrying area of the first electrode post is large, which improves the current-carrying and fast-charging capabilities of the first electrode post. When the ratio of the thickness of the second limiting platform to the thickness of the first wall satisfies the corresponding ranges, it helps to prevent the first electrode post from easily separating from the first wall, further improving the riveting reliability. It also helps to reduce the thickness of the portion of the second limiting platform protruding into the housing, reducing the space occupied by the first electrode post within the housing, which is beneficial to improving the volumetric energy density of the battery cell.

[0014] In some embodiments, the conductive portion includes a plurality of tabs connected to the active material coating portion. The ends of the plurality of tabs near the active material coating portion are gathered together to form a first gathered portion, and the ends of the plurality of tabs away from the active material coating portion are gathered together and connected to form a second gathered portion. The first gathered portion connects the second gathered portion and the active material coating portion, and the end face of the second gathered portion near the first electrode post forms a second welding surface.

[0015] In the above technical solution, by setting the end face of the second gathering part close to the first pole post to form the second welding surface, it is beneficial to shorten the length of the conductive part, save the space occupied by the conductive part, and facilitate the improvement of the volumetric energy density of the battery cell.

[0016] In some embodiments, the plane containing the cross-section of the mounting hole is used as the projection plane, and at least a portion of the outer contour of the projection of the first gathering portion on the projection plane is located within the range of the outer contour of the projection of the first welding surface on the projection plane along a direction perpendicular to the projection plane.

[0017] In the above technical solution, by setting at least a portion of the outer contour of the projection of the first gathering part on the projection surface to be within the range of the outer contour of the projection of the first welding surface on the projection surface, it is beneficial to save the space occupied by the first gathering part in the axial direction of the vertical mounting hole, and to reduce the distance between the first pole post and the cell assembly in the axial direction of the mounting hole, so as to improve the energy density of the battery cell.

[0018] In some embodiments, the conductive portion includes a plurality of tabs connected to the active material coating portion, and an adapter piece; the ends of the plurality of tabs near the active material coating portion are gathered together to form a first gathered portion, the ends of the plurality of tabs away from the active material coating portion are gathered together and connected to form a second gathered portion, the first gathered portion connects the second gathered portion and the active material coating portion, the adapter piece connects the second gathered portion and the first electrode post, and a portion of the end face of the adapter piece near the first electrode post forms a second welding surface.

[0019] In the above technical solution, an adapter piece is used to achieve an indirect electrical connection between the second folding part and the first electrode post. The adapter piece can be welded to the first electrode post by avoiding the part of the second folding part, thereby making the welding between the adapter piece and the first electrode post more reliable, reducing the risk of welding cracking, and further improving the reliability and stability of the battery cell. At the same time, the electrical connection between the first electrode post and the electrode tab through the adapter piece can also simplify the structure of the electrode tab.

[0020] In some embodiments, with the plane containing the cross-section of the mounting hole as the projection plane, at least a portion of the outer contour of the projection of the second gathering portion on the projection plane is located within the range of the outer contour of the projection of the first welding surface on the projection plane along a direction perpendicular to the projection plane; and / or, with the plane containing the cross-section of the mounting hole as the projection plane, at least a portion of the outer contour of the projection of the first gathering portion on the projection plane is located within the range of the outer contour of the projection of the first welding surface on the projection plane along a direction perpendicular to the projection plane.

[0021] In the above technical solution, by setting at least a portion of the outer contour of the projection of the second gathering part on the projection surface to be within the range of the outer contour of the projection of the first welding surface on the projection surface, and at least a portion of the outer contour of the projection of the first gathering part on the projection surface to be within the range of the outer contour of the projection of the first welding surface on the projection surface, it is beneficial to save the space occupied by the first gathering part and the second gathering part in the axial direction perpendicular to the mounting hole, and to reduce the distance between the first pole post and the cell assembly in the axial direction of the mounting hole, so as to improve the energy density of the battery cell.

[0022] In some embodiments, the first pole post is provided with a receiving portion, and at least a portion of the guide portion is received within the receiving portion.

[0023] In the above technical solution, on the one hand, the first electrode post is provided with a receiving portion, which can reduce the weight of the first electrode post to a certain extent, thereby improving the weight energy density of the battery cell and the battery. On the other hand, by accommodating at least a portion of the conductive part in the receiving portion, the space occupied by the conductive part in the first electrode post can be reduced, thereby reducing the space occupied by the conductive part in the housing. When the size of the housing is fixed, some space can be saved in the housing to accommodate a larger active material coating portion, thereby improving the volumetric energy density of the battery cell. At the same time, accommodating at least a portion of the conductive part in the receiving portion can reduce the space occupied by the battery cell itself, allowing more battery cells to be accommodated in the same volume, thereby improving the volumetric energy density of the battery. In addition, accommodating at least a portion of the conductive part in the receiving portion can also reduce the redundancy of the conductive part in the housing to a certain extent, reduce the probability of short circuit between the conductive part and the active material coating portion, reduce the probability of short circuit in the electrode assembly, and thus improve the working reliability and stability of the battery cell and the battery. Furthermore, by accommodating at least a portion of the conductive part within the accommodating part, the conductive part can be limited and constrained by the accommodating part, which helps to improve the reliability of the conductive part and ensure the reliability and stability of the welding between the conductive part and the first electrode post, thereby improving the reliability of the battery cell.

[0024] In some embodiments, the receiving portion has a first receiving groove, the surface of the first electrode post facing the active material coating portion is the inner end face of the electrode post, the groove opening of the first receiving groove is formed on the inner end face of the electrode post, and at least a portion of the conductive portion is received in the first receiving groove.

[0025] In the above technical solution, on the one hand, opening a first receiving groove on the first electrode post can reduce the weight of the first electrode post to a certain extent, thereby improving the weight energy density of the battery cell and the battery. On the other hand, since the opening of the first receiving groove is formed on the inner end face of the electrode post, and the inner end face of the electrode post is the surface of the first electrode post near the active material coating part, the first receiving groove can be opened towards the active material coating part, thereby facilitating the insertion of the conductive part into the first receiving groove and improving assembly efficiency. At the same time, since the first receiving groove faces the active material coating part, the first receiving groove can also serve as a buffer and temporary storage structure for the electrolyte, allowing the casing to accommodate... The addition of more electrolyte extends the lifespan of individual battery cells, as they are lost during charging and discharging. Furthermore, because the first containment tank faces the active material coating, it also serves as a buffer and containment structure for gas generated inside the electrode assembly, reducing cell expansion and improving cell reliability and stability. Additionally, the first containment tank is located inside the electrode post, making it difficult for external impurities to enter, thus reducing the impact of external contaminants on the electrode assembly and ensuring its stability and reliability, thereby improving the stability and reliability of the battery cells and the entire battery.

[0026] In some embodiments, the wall of the first receiving tank has a first sink, and the position where the conductive part is electrically connected to the first pole is at least partially located within the first sink.

[0027] In the above technical solution, on the one hand, by setting a first groove on the first end wall, the conductive part can be pre-positioned using the first groove, which is conducive to accurately finding the position to realize electrical connection and improving production efficiency; on the other hand, by setting a first groove on the first end wall, the local wall thickness of the first end wall can be locally reduced, which is not only conducive to welding electrical connection, but also conducive to reducing the weight of the first electrode post and increasing the weight energy density of the battery cell.

[0028] In some embodiments, the first electrode post has a first groove, the side surface of the first electrode post away from the active material coating portion is the outer end face of the electrode post, and the groove opening of the first groove is formed on the outer end face of the electrode post.

[0029] In the above technical solution, on the one hand, the first groove on the first electrode post can further reduce the weight of the first electrode post, thereby improving the weight energy density of the battery cell and the battery. On the other hand, the first groove is located on the outside of the first electrode post, which can be used to accommodate or install structural components that electrically connect the various battery cells, so as to make full use of the space inside the first electrode post and improve the space utilization and volumetric energy density of the battery. In addition, since the first electrode post has both a first receiving groove and a first recess, and the first recess is located on the side of the first receiving groove away from the active material coating part, and the first recess is open in the direction away from the first receiving groove, it is convenient to make electrical connection between the conductive part and the groove wall of the first receiving groove from the outside of the first electrode post. For example, it is convenient to externally weld the first electrode post and the conductive part through the first recess, which facilitates the processing and manufacturing of the battery cell and can save processing and manufacturing costs.

[0030] In some embodiments, the battery cell further includes a slot cover, which is disposed on the first terminal post and covers the slot opening of the first groove.

[0031] In the above technical solution, the slot cover facilitates the electrical connection between adjacent battery cells within the battery. Furthermore, because the electrical connection points between battery cells are separated from the electrical connection points of the conductive parts and the first terminal post by the first groove, interference between them is reduced, further improving the stability and reliability of the battery cells. Simultaneously, the slot cover also prevents foreign objects from entering the first groove, reducing interference from external objects on the cell assembly and further improving the reliability and stability of the battery cells.

[0032] In some embodiments, the receiving portion has a second receiving groove, the surface of the first electrode post away from the active material coating portion is the outer end face of the electrode post, the groove opening of the second receiving groove is formed on the outer end face of the electrode post, the second receiving groove communicates with the interior of the housing through a first through hole, and the conductive portion passes through the first through hole and is at least partially received in the second receiving groove.

[0033] In the above technical solution, on the one hand, the first electrode post is provided with a second receiving groove, which can reduce the weight of the first electrode post to a certain extent, thereby improving the weight energy density of the battery cell and the battery. On the other hand, since the opening of the second receiving groove is formed on the outer end face of the electrode post, and the outer end face of the electrode post is the surface of the first electrode post away from the active material coating part, the second receiving groove can be opened in the direction away from the active material coating part. In this way, when at least part of the conductive part is accommodated in the second receiving groove, the conductive part can be easily stored and organized through the opening of the second receiving groove, or the operation of electrically connecting the conductive part to the first electrode post can be performed, thereby reducing the production difficulty of the battery cell and improving the production efficiency of the battery cell. Meanwhile, since the second receiving tank can communicate with the shell through the first perforation, it can also serve as a buffer and temporary storage structure for the electrolyte, allowing the shell to hold more electrolyte. Since the battery cell loses electrolyte during charging and discharging, more electrolyte can extend the battery cell's lifespan. Furthermore, because the second receiving tank can communicate with the shell through the first perforation, it can also serve as a receiving and buffering structure for gas generated inside the electrode assembly, reducing the expansion of the battery cell and improving its reliability and stability.

[0034] In some embodiments, the second receiving tank has a second sink, and the position where the conductive part is electrically connected to the first pole is at least partially located within the second sink.

[0035] In the above technical solution, by setting the second receiving tank with a second sink, the conductive part can be pre-positioned using the second sink, which is beneficial for accurately locating the electrical connection and improving production efficiency.

[0036] In some embodiments, the housing assembly further includes a first cover plate that engages with a first pole post and closes the opening of a second receiving groove, and the first cover plate is electrically connected to the first pole post.

[0037] In the above technical solution, by setting a first cover plate to close the opening of the second receiving tank, the electrolyte inside the casing can be prevented from leaking out of the opening of the second receiving tank. Moreover, since the first cover plate closes the opening of the second receiving tank and is electrically connected to the first electrode post, the first electrode post can be easily connected to the battery's current-carrying component by using the first cover plate. This also helps to increase the connection area at the electrical connection point, thereby helping to reduce the resistance at the electrical connection point.

[0038] In some embodiments, the housing assembly further includes a second cover plate that covers the first perforation and the conductive portion located within the second receiving groove.

[0039] In the above technical solution, when the electrolyte enters the second receiving tank from the first perforation, the second cover plate can improve the problem of electrolyte overflowing from the first electrode post, thereby improving the reliability of the battery cell.

[0040] In some embodiments, the battery cell further includes: a support, located within the housing and on the side of the active material coating portion near the first electrode post, the support having a clearance hole for avoiding a conductive portion, the conductive portion being adapted to extend through the clearance hole to the side of the support away from the active material coating portion.

[0041] In the above technical solution, by setting clearance holes on the bracket, the conductive part can be guided and constrained to cooperate with the first electrode post by passing through the clearance holes. This not only simplifies the arrangement of the conductive part, saves the material of the conductive part, and reduces the cost, but also reduces the risk of short circuit connection between the conductive part and the active material coating part by supporting and guiding the conductive part to cooperate with the first electrode post, thereby further improving the reliability of the battery cell.

[0042] In some embodiments, the bracket has a guide portion that surrounds at least a portion forming a clearance hole and extends at least partially into a receiving portion.

[0043] In the above technical solution, since the bracket has a guide portion that extends at least partially into the receiving portion, and at least part of the guide portion surrounds and forms an avoidance hole, at least part of the conductive portion can be easily housed into the receiving portion, thereby improving the assembly efficiency of the conductive portion. At the same time, the setting of the guide portion makes the fit between the bracket and the terminal post, and between the bracket and the conductive portion, tighter and more reliable, making the structure of the battery cell more compact and more conducive to improving the energy density of the battery cell.

[0044] In some embodiments, the clearance hole includes a first hole segment and a second hole segment. The second hole segment is located on the side of the first hole segment near the active material coating portion, and the cross-sectional area of the second hole segment gradually increases in the direction away from the first hole segment. The active material coating portion includes a current collector and an active material layer disposed on the current collector. The conductive portion includes an electrode portion electrically connected to the current collector. The electrode portion includes a plurality of electrode tabs. The plurality of electrode tabs converge near the current collector to form a first convergence portion. The plurality of electrode tabs converge and connect away from the current collector to form a second convergence portion. The first convergence portion connects the second convergence portion and the active material coating portion. At least a portion of the first convergence portion is accommodated in the second hole segment, and the second convergence portion passes through the first hole segment.

[0045] In the above technical solution, by setting the avoidance hole as a second hole segment that gradually expands in the direction towards the active material coating part, it is easier for the second hole segment to accommodate more of the first gathering part, thereby improving the compactness of the fit between the bracket and the cell assembly, so that the overall volume of the battery cell is smaller, and the battery can accommodate more battery cells, thereby improving the volumetric energy density of the battery.

[0046] In some embodiments, the bracket is an integral structure; or, the bracket is a split structure and includes a detachable first bracket and a second bracket, with a clearance hole defined between the first bracket and the second bracket.

[0047] In the above technical solutions, when the bracket is an integral structure, it is easy to process, has good reliability, and facilitates assembly with the housing assembly, improving assembly efficiency and fit stability. When the bracket is a split structure, the first and second brackets define a clearance hole. When assembling the bracket with the battery cell assembly, it is not necessary to pass the conductive part through one end of the clearance hole to the other. Instead, the first and second brackets can be joined together at the position of the conductive part to clamp the conductive part, so that the clearance hole surrounds the conductive part, thereby facilitating the assembly of the bracket with the battery cell assembly and improving assembly efficiency.

[0048] In some embodiments, the battery cell further includes an inner insulating member, which is located inside the housing and wrapped around the active material coating portion, and is connected to the support.

[0049] In the above technical solution, on the one hand, by wrapping the active material coating part with an inner insulating component, the insulation reliability between the active material coating part and the shell can be improved, reducing or preventing the shell from being corroded due to contact between the active material coating part and the shell, reducing the leakage of electrolyte caused by shell corrosion, thereby improving the reliability of the battery cell; on the other hand, connecting the inner insulating component with the bracket can reduce the difficulty of fixing the inner insulating component and improve the reliability of the inner insulating component wrapped around the active material coating part.

[0050] In some embodiments, the housing assembly includes a plurality of poles, at least one of which is a first pole.

[0051] In the above technical solution, at least one of the terminals of the housing assembly is a first terminal, so that the entire battery cell can be either partially composed of first terminals with a receiving portion or entirely composed of first terminals with a receiving portion. This allows for flexible selection and matching based on actual needs such as energy density and cost, thereby improving the applicability of the battery cell.

[0052] In some embodiments, the housing has a pressure relief section, which is located on the same side surface of the housing as the first pole post; or, the pressure relief section and the first pole post are located on two different sides of the housing.

[0053] In the above technical solution, when the pole and the pressure relief part are arranged on the same side, it is convenient to process and assemble. When the pole and the pressure relief part are arranged on opposite sides, it can save space, increase the volume of the pole, and reduce the adverse effects of the pressure relief part on the pole when it relieves pressure.

[0054] In some embodiments, the housing has a pressure relief section, the housing includes a body and a cover, one end of the body is open, the cover is located at the open end of the body, and the pressure relief section is located at the cover.

[0055] In the above technical solution, the pressure relief part is easy to process and has good pressure relief reliability.

[0056] In some embodiments, the ratio of the projected area of the welded portion on the projection plane to the projected area of the first wall on the projection plane is in the range of 0.1% to 1% along a direction perpendicular to the projection plane.

[0057] In the above technical solution, by setting the ratio of the projected area of the welded part between the conductive part and the first polarity post on the projection surface to the projected area of the first wall on the projection surface to be within the range of 0.1% to 1%, the equivalent resistance between the conductive part and the first polarity post can be reduced to a certain extent, the current-carrying area of the first polarity post can be increased, and the current-carrying capacity of the first polarity post can be improved, which is conducive to improving the charging speed of the battery cell and improving the fast charging performance of the battery cell.

[0058] In some embodiments, the projected area of the second welding surface on the projection surface is greater than or equal to 3% of the total area of the projected area of the first wall on the projection surface; and / or, the projected area of the first welding surface on the projection surface is greater than or equal to 25% of the total area of the projected area of the first wall on the projection surface.

[0059] In the above technical solution, by setting the ratio of the projected area of the second welding surface on the projection surface and the projected area of the first welding surface on the projection surface to the projected area of the first wall on the projection surface, the volume of the first electrode post is further increased, thereby increasing the current-passing area of the conductive part, the first electrode post and the busbar assembly, and further improving the charging speed of the battery cell.

[0060] In some embodiments, at least two first pole posts are provided on the first wall.

[0061] In the above technical solution, by setting at least two first poles on the first wall, the two first poles with opposite polarities facilitate the power supply connection of the battery cell; while the two first poles with the same polarity facilitate the welding and fixing of the cell assembly to the first poles.

[0062] In some embodiments, the housing has two opposing first walls, each of which is provided with a first pole post.

[0063] In the above technical solution, by setting a first pole on each of the two oppositely arranged first walls, it is easy to make the two first poles have a suitable distance and to simplify the power supply connection of the battery cell.

[0064] In some embodiments, the mounting hole includes a plurality of spaced-apart sub-holes, the first electrode post includes a plurality of sub-electrodes of the same polarity, and the plurality of sub-electrodes are disposed one-to-one in the plurality of sub-holes; the cell assembly includes a plurality of active material coated portions, and the conductive portion includes a plurality of conductive portions connected one-to-one with the plurality of active material coated portions, each conductive portion being electrically connected to an electrode post through a welding portion; with the cross-sectional surface of the mounting hole as the projection surface, along the direction perpendicular to the projection surface, the ratio of the sum of the projected areas of the plurality of welding portions on the projection surface to the projected area of the first wall on the projection surface is between 0.1% and 1%.

[0065] In the above technical solution, when the first electrode post includes multiple sub-electrodes of the same polarity and the welding part includes multiple welding segments, the ratio of the sum of the projected areas of the multiple welding segments on the projection surface to the projected area of the first wall on the projection surface is between 0.1% and 1%. This can also reduce the equivalent resistance between the conductive part and the first electrode post to a certain extent, increase the current-carrying area of the first electrode post, and improve the current-carrying capacity of the first electrode post. This is beneficial to improving the charging speed of the battery cell and enhancing the fast-charging performance of the battery cell.

[0066] In some embodiments, the outer contour of the projection of the first pole onto the projection plane is composed of straight lines, or is composed of a combination of straight lines and arcs.

[0067] In the above technical solution, by setting at least a portion of the outer contour of the projection of the first pole on the projection surface to be composed of straight lines, the portion of the first pole corresponding to the straight lines is subjected to less tension than the curved portion, making it less likely to crack after the first pole is installed, thus ensuring the strength of the first pole, improving the reliability and stability of the first pole, and further improving the reliability and stability of the battery cell.

[0068] In some embodiments, the dimension of the first pole post in the first direction is greater than or equal to the dimension of the first pole post in the second direction, and the first direction, the second direction and the axis of the mounting hole are perpendicular to each other.

[0069] In the above technical solution, by setting the size of the first electrode post in the first direction to be larger than the size of the first electrode post in the second direction, the first electrode post is formed into a long strip shape, which is beneficial to increase the length of the first electrode post and the housing, improve the installation reliability of the first electrode post, and enhance the stability and reliability of the battery cell; by setting the size of the first electrode post in the first direction to be equal to the size of the first electrode post in the second direction, it is beneficial to make room for the installation of other components (such as other first electrodes post, etc.) under the premise that the first electrode post is installed reliably.

[0070] In some embodiments, the dimension of the first pole post in the first direction is greater than or equal to three times the dimension of the first pole post in the second direction; and / or, the first direction is the length direction of the first wall and the second direction is the width direction of the first wall; and / or, the dimension of the first wall in the first direction is greater than the dimension of the first wall in the second direction.

[0071] In the above technical solution, by setting the dimension of the first electrode post in the first direction to be greater than or equal to three times the dimension of the first electrode post in the second direction, it is applicable to situations where the first wall is relatively long in the first direction. This fully utilizes the dimensions of the first wall, i.e., fully utilizes the area provided by the first wall where the first electrode post can be installed, thereby increasing the mating area between the first electrode post and the casing, improving the installation strength of the first electrode post, and thus further improving the stability and reliability of the battery cell. By setting the first direction to the length direction of the first wall and the second direction to the width direction of the first wall, it is convenient to ensure that the length direction of the first wall is consistent with the length direction of the cross-section of the first electrode post, and the width direction of the first wall is consistent with the width direction of the cross-section of the first electrode post. This effectively ensures a good match between the first wall and the first electrode post on the first wall in both the first and second directions, allowing the first electrode post on the first wall to further utilize the arrangement area provided by the first wall, thereby increasing the mating area between the first electrode post and the casing, improving the installation strength of the first electrode post, and thus improving the reliability and stability of the battery cell.

[0072] Secondly, embodiments of this application also provide a battery, including the aforementioned battery cell.

[0073] In the above technical solution, since the battery is equipped with the aforementioned battery cell, and the plane where the cross-section of the mounting hole is located is the projection plane, along the direction perpendicular to the projection plane, the outer contour of the projection of the second welding surface of the conductive part on the projection plane is within the range of the outer contour of the projection of the first welding surface of the first pole on the projection plane, which can improve the reliability and stability of the battery cell, thereby improving the reliability and stability of the battery.

[0074] Thirdly, embodiments of this application also provide an electrical device, including the battery described above.

[0075] In the above technical solution, since the electrical device is equipped with the aforementioned battery, and the stability and reliability of the battery can be improved, the working stability and reliability of the electrical device can be improved. Attached Figure Description

[0076] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0077] Figure 1 Schematic diagram of an electrical device provided for some embodiments of this application;

[0078] Figure 2 Exploded views of batteries provided for some embodiments of this application;

[0079] Figure 3 A schematic diagram of a battery cell provided in some embodiments of this application;

[0080] Figure 4 for Figure 3 A schematic diagram of a single battery cell is shown.

[0081] Figure 5 A schematic diagram of a battery cell provided in some embodiments of this application;

[0082] Figure 6 for Figure 5 A partial schematic diagram of a single battery cell shown;

[0083] Figure 7 for Figure 5 Another schematic diagram of the battery cell shown;

[0084] Figure 8 Cross-sectional views of a battery cell provided in some embodiments of this application;

[0085] Figure 9 A schematic diagram of a battery cell provided in some embodiments of this application;

[0086] Figure 10 for Figure 9 A schematic diagram of the first pole post and the first wall shown;

[0087] Figure 11 A schematic diagram of a battery cell provided in some embodiments of this application;

[0088] Figure 12 for Figure 11 A schematic diagram of the first pole and the first wall shown;

[0089] Figure 13 This is a schematic diagram of the assembly of a battery cell provided in some embodiments of this application;

[0090] Figure 14 for Figure 13 A schematic diagram of the first pole and the first wall shown;

[0091] Figure 15 A schematic diagram of a battery cell provided in some embodiments of this application;

[0092] Figure 16 A schematic diagram of a battery cell provided in some embodiments of this application;

[0093] Figure 17 For along Figure 16 A cross-sectional view of the VV line in the middle;

[0094] Figure 18 This is a schematic diagram of the assembly of the first pole post and the first wall provided for some embodiments of this application;

[0095] Figure 19 for Figure 18 Another assembly diagram of the first pole post and the first wall shown in the figure;

[0096] Figure 20 This application provides a schematic diagram of the welding of the first pole post and the conductive part in some embodiments;

[0097] Figure 21 Cross-sectional views of a battery cell provided in some embodiments of this application;

[0098] Figure 22 Cross-sectional views of a battery cell provided in some embodiments of this application;

[0099] Figure 23 Cross-sectional views of a battery cell provided in some embodiments of this application;

[0100] Figure 24 Cross-sectional views of a battery cell provided in some embodiments of this application;

[0101] Figure 25 for Figure 3 The above-projected view of the battery cell shown;

[0102] Figure 26 for Figure 25 Sectional view along line AA;

[0103] Figure 27 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0104] Figure 28 Assembly diagrams of the second pole post without a receiving portion, the battery cell assembly, and the housing provided in some embodiments of this application;

[0105] Figure 29 A partial cross-sectional schematic diagram of a battery cell provided in some embodiments of this application;

[0106] Figure 30 A partial cross-sectional schematic diagram of a battery cell assembly provided in some embodiments of this application;

[0107] Figure 31 Schematic diagrams of various tab-gathering schemes for battery cell assemblies provided in some embodiments of this application;

[0108] Figure 32 A partial cross-sectional schematic diagram of a battery cell provided in some embodiments of this application;

[0109] Figure 33 A partial cross-sectional schematic diagram of a battery cell provided in some embodiments of this application;

[0110] Figure 34 A partial cross-sectional schematic diagram of a battery cell provided in some embodiments of this application;

[0111] Figure 35 A partial cross-sectional schematic diagram of a battery cell provided in some embodiments of this application;

[0112] Figure 36 A partial cross-sectional schematic diagram of a battery cell provided in some embodiments of this application;

[0113] Figure 37 for Figure 3 A magnified view of a portion of point W;

[0114] Figure 38 Orthographic views of various first poles provided in some embodiments of this application;

[0115] Figure 39 A partial cross-sectional schematic diagram of a battery cell provided in some embodiments of this application;

[0116] Figure 40 A partial cross-sectional schematic diagram of a battery cell provided in some embodiments of this application;

[0117] Figure 41 A partial cross-sectional schematic diagram of a battery cell provided in some embodiments of this application;

[0118] Figure 42 Exploded views of the structure of a single battery cell provided in some embodiments of this application;

[0119] Figure 43 Partial cross-sectional schematic diagram of the housing assembly provided for some embodiments of this application;

[0120] Figure 44 for Figure 43 The exploded view of the housing assembly shown is shown.

[0121] Figure 45 for Figure 44 The exploded view of the first cover plate shown;

[0122] Figure 46 A partial cross-sectional schematic diagram of a battery cell provided in some embodiments of this application;

[0123] Figure 47 for Figure 46 The exploded view of the battery cell structure is shown below;

[0124] Figure 48A partial cross-sectional schematic diagram of a battery cell provided in some embodiments of this application;

[0125] Figure 49 A partial cross-sectional schematic diagram of a battery cell provided in some embodiments of this application;

[0126] Figure 50 A partial cross-sectional schematic diagram of a battery cell provided in some embodiments of this application;

[0127] Figure 51 A partial cross-sectional schematic diagram of a battery cell provided in some embodiments of this application;

[0128] Figure 52 A partial cross-sectional schematic diagram of a battery cell provided in some embodiments of this application;

[0129] Figure 53 This is a schematic diagram illustrating the interaction between the battery cell assembly and the support frame according to some embodiments of this application;

[0130] Figure 54 for Figure 53 A cross-sectional view along the CC line;

[0131] Figure 55 This is a schematic diagram of the structure of an integrated bracket provided in some embodiments of this application;

[0132] Figure 56 This is a schematic diagram of the structure of a split-type support provided in some embodiments of this application;

[0133] Figure 57 A partial cross-sectional schematic diagram of the cell assembly and bracket provided in some embodiments of this application;

[0134] Figure 58 Exploded views of the battery cell assembly, support frame, and housing assembly provided in some embodiments of this application;

[0135] Figure 59 Exploded views of the structure of the first pole post, housing, and sealing gasket provided in some embodiments of this application;

[0136] Figure 60 for Figure 59 The assembly diagram shown is of the first pole, housing, and sealing gasket.

[0137] Figure 61 This is a schematic diagram of the structure of the first pole post provided in some embodiments of this application;

[0138] Figure 62 A cross-sectional schematic diagram of a housing assembly provided for some embodiments of this application;

[0139] Figure 63A cross-sectional schematic diagram of a housing assembly provided for some embodiments of this application;

[0140] Figure 64 Orthographic projection views of a battery cell provided in some embodiments of this application;

[0141] Figure 65 for Figure 64 A sectional view along the EE line;

[0142] Figure 66 A partial cross-sectional schematic diagram of a battery cell provided in some embodiments of this application;

[0143] Figure 67 Orthographic projection views of a battery cell provided in some embodiments of this application;

[0144] Figure 68 for Figure 67 A cross-sectional view along the U-shaped line.

[0145] Figure 69 for Figure 68 A magnified view of the V-shaped section shown in the center circle;

[0146] Figure 70 This is a schematic diagram of the shell cover provided in some embodiments of this application;

[0147] Figure 71 A schematic diagram of a single battery cell provided in an embodiment of this application;

[0148] Figure 72 for Figure 71 The diagram shows the connection between the outer insulation component and the patch.

[0149] Figure label:

[0150] 1000 electrical devices; 100 batteries; 200 controllers; 300 motors;

[0151] First direction X; Second direction Y; Third direction Z;

[0152] Battery cell 10; housing 20; first housing section 201; second housing section 202;

[0153] Housing assembly 1;

[0154] Shell 11; First wall 110; Second wall 11b; Shell body 111; Shell cover 112; Mounting hole 113; Split hole 1131;

[0155] First pole post 12; First welding surface 120; First part 120a; Second part 102b;

[0156] The pole body 12a; the first limiting stage 12b; the second limiting stage 12c;

[0157] Reception section 121;

[0158] First receiving groove 12110; first end wall 12111; first settling groove 12112; first side wall 12113;

[0159] Second receiving groove 12120; second end wall 12121; second settling groove 12122; second side wall 12123;

[0160] First groove segment 12124; Second groove segment 12125; Guide slope 12126; Step surface 12127;

[0161] First perforation 12130;

[0162] Third receiving groove 12140; Fourth receiving groove 12150; Second perforation 12160; Third perforation 12170;

[0163] Inner end face of the pole post 122; Outer end face of the pole post 123;

[0164] First pole post 124; Second pole post 125;

[0165] First groove 126; spacer 127;

[0166] Stop part 1281; Through part 1282; Flanged part 1283;

[0167] Part 1, page 1291; Part 2, page 1292;

[0168] First cover plate 13; first conductive element 131; second groove 1311; second conductive element 132; stress relief groove 133;

[0169] Second cover plate 14; Second pole post 15; Pressure relief section 16; Injection hole 17; Reflux groove 18;

[0170] Cell assembly 2; Electrode assembly 2a;

[0171] Active material coating part 21; current collector 211; active material layer 212;

[0172] Conductive part 22; Second welding surface 220; Conductive portion 22A;

[0173] Electrode portion 221; Electrode plate 2211; First gathering portion 2212; Second gathering portion 2213; Adapter plate 222;

[0174] 3. Bracket; 31. Clearance hole; 311. First hole section; 312. Second hole section; 32. Guide part; 33. First bracket; 34. Second bracket; 35. Housing guide surface; 36. Body part; 37. Extension part;

[0175] Inner insulation component 4; First sealing component 6;

[0176] 5. External insulation component; 51. Connecting part; 52. Covering part; 5A. Patches; 7. Groove cover; 8. Insulating and sealing component; 81. Insulating component; 82. Second sealing component; 9. Welding part; 91. Detailed Implementation

[0177] 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 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.

[0178] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0179] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0180] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0181] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0182] In this application, "multiple" means two or more (including two).

[0183] In this application, the battery cell may include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, etc., and the embodiments of this application are not limited thereto. The battery cell may be cylindrical, flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited thereto. Battery cells are generally classified into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and the embodiments of this application are not limited thereto.

[0184] The battery mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application can be a battery module or a battery pack. When the battery is a battery module, the battery module is composed of multiple battery cells. When the battery is a battery pack, the battery pack can be directly composed of a housing and multiple battery cells disposed within the housing, or the battery cells can be first composed of battery modules, and then the battery modules can be disposed within the housing.

[0185] Specifically, a single battery cell typically includes a casing, a cell assembly, and an electrolyte. The casing houses the cell assembly and the electrolyte, and has at least one positive electrode post and at least one negative electrode post. The cell assembly includes one or more electrode assemblies, which are formed by stacking or winding positive electrode plates, negative electrode plates, and separators.

[0186] The positive electrode generally includes a positive current collector and a positive active material layer. The positive active material layer is directly or indirectly coated on the positive current collector, and the positive current collector without the positive active material layer protrudes from the positive current collector with the positive active material layer. The positive current collector without the positive active material layer serves as the positive electrode tab. Multiple positive electrode tabs are stacked together and form an electrical connection with the positive electrode post. For example, the multiple stacked positive electrode tabs can be directly soldered to the positive electrode post to form an electrical connection; or, the battery cell assembly can also include a positive electrode adapter piece, with the multiple stacked positive electrode tabs soldered to one end of the positive electrode adapter piece, and the other end of the positive electrode adapter piece soldered to the positive electrode post, so that the positive electrode tabs and the positive electrode post form an electrical connection.

[0187] The negative electrode generally includes a negative current collector and a negative active material layer. The negative active material layer is directly or indirectly coated on the negative current collector, and the negative current collector without the negative active material layer protrudes from the negative current collector with the negative active material layer. The negative current collector without the negative active material layer serves as the negative electrode tab. Multiple negative electrode tabs are stacked together and form an electrical connection with the negative electrode post. Exemplarily, the multiple stacked negative electrode tabs can be directly soldered to the negative electrode post to form an electrical connection; alternatively, the battery cell assembly can also include a negative electrode adapter piece, with the multiple stacked negative electrode tabs soldered to one end of the negative electrode adapter piece, and the other end of the negative electrode adapter piece soldered to the negative electrode post, so that the negative electrode tabs and the negative electrode post form an electrical connection.

[0188] The material of the separator is not limited; for example, it can be polypropylene or polyethylene. The shape of the casing is adjusted according to the type of battery cell. The type of battery cell in the embodiments of this application is not limited. For example, when the battery cell is a square battery, the casing is square; when the battery cell is a cylindrical battery, the casing is cylindrical.

[0189] Meanwhile, individual battery cells primarily function by the movement of metal ions between the positive and negative electrode plates. Taking lithium-ion batteries as an example, the positive electrode current collector can be made of aluminum, and the positive electrode active material layer can be made of lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode current collector can be made of copper, and the negative electrode active material layer can be made of carbon or silicon, etc. During charging and discharging, Li+ ions repeatedly insert and extract between the two electrodes: during charging, Li+ ions extract from the positive electrode, pass through the electrolyte, and insert into the negative electrode, leaving the negative electrode in a lithium-rich state; the reverse occurs during discharging.

[0190] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, batteries, as the power source, play an irreplaceable and crucial role. Among these, batteries, as core components of new energy vehicles, have high requirements in terms of both energy density and reliability.

[0191] In related technologies, the terminals of a battery cell are electrically connected to the cell assembly. The area in the terminal used for welding to the cell assembly is called the first welding area, and the area in the cell assembly used for welding to the terminal is called the second welding area. Typically, the second welding area extends beyond the first welding area to ensure the overcurrent capacity of the battery cell. However, this arrangement makes welding between the terminal and the cell assembly inconvenient and results in low welding reliability.

[0192] In view of this, this application provides a battery cell, which includes a housing assembly and a cell assembly. The housing assembly includes a housing and a first terminal post. The housing has a first wall with a mounting hole. The first terminal post is disposed in the mounting hole and includes a first welding surface. The cell assembly includes an active material coating portion and a conductive portion electrically connected to the active material coating portion. The active material coating portion is housed within the housing. The conductive portion includes a second welding surface that contacts the first welding surface. A portion of the second welding surface is partially welded to a portion of the first welding surface through the welding portion. Taking the plane containing the cross-section of the mounting hole as the projection plane, along a direction perpendicular to the projection plane, the outer contour of the projection of the second welding surface on the projection plane is within the range of the outer contour of the projection of the first welding surface on the projection plane.

[0193] In the battery cell with the above structure, by setting the projection plane of the cross-section of the mounting hole as the projection plane, and along the direction perpendicular to the projection plane, the outer contour of the projection of the second welding surface on the projection plane is located within the outer contour of the projection of the first welding surface on the projection plane. The area of the first electrode post that can be welded to the conductive part is larger than the area of the conductive part that can be welded to the first electrode post, so as to achieve the ultra-large setting of the first electrode post. On the one hand, while keeping the size of the conductive part unchanged, making the first electrode post larger can ensure the current-carrying area of the conductive part and increase the current-carrying area of the first electrode post. At the same time, the ultra-large setting of the first electrode post can make the busbar assembly electrically connected to the first electrode post relatively large, so that the area of the busbar assembly used for electrical connection (e.g., welding) with the first electrode post can be set larger, which can also increase the current-carrying area of the busbar assembly. Meanwhile, the increased current-carrying area of the conductive part, the first terminal, and the busbar assembly not only reduces resistance and improves temperature rise during charging and discharging to enhance the reliability of the battery cell, but also increases current to improve the fast-charging performance of the battery cell. On the other hand, the extra-large setting of the first terminal provides a larger welding space, which increases the welding space between the first terminal and the conductive part, and also increases the welding space between the first terminal and the busbar assembly. Therefore, the welding reliability and stability are higher, which can further improve the reliability and stability of the battery cell.

[0194] The battery cells disclosed in this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system for such an electrical device can be constructed using battery cells disclosed in this application, thus expanding the applicability of the battery cells.

[0195] This application provides an electrical device that uses a single battery cell as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0196] The following embodiments use a vehicle as an example to describe in detail the housing assembly, battery cell, battery, and electrical device provided in the embodiments of this application.

[0197] Please refer to Figure 1 , Figure 1 The electrical device 1000 provided in some embodiments of this application is a structural schematic diagram of a vehicle. The vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery 100 is installed inside the vehicle, and the battery 100 can be located at the bottom, front, or rear of the vehicle. The battery 100 can be used to supply power to the vehicle; for example, the battery 100 can serve as the vehicle's operating power source. The vehicle may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300, for example, to meet the power needs of starting, navigation, and driving the vehicle. In some embodiments of this application, the battery 100 can not only serve as the vehicle's operating power source but also as the vehicle's driving power source, replacing or partially replacing gasoline or natural gas to provide driving power to the vehicle.

[0198] Please refer to Figure 2 , Figure 2This is an exploded view of the structure of a battery 100 provided in some embodiments of this application. The battery 100 includes a housing 20 and a battery cell 10, with the battery cell 10 housed within the housing 20. The housing 20 provides assembly space for the battery cell 10, and the housing 20 can employ various structures. In some embodiments, the housing 20 may include a first housing portion 201 and a second housing portion 202, which overlap each other, and together define an assembly space for accommodating the battery cell 10. The second housing portion 202 can be a hollow structure with one end open, and the first housing portion 201 can be a plate-like structure. The first housing portion 201 covers the opening side of the second housing portion 202, so that the first housing portion 201 and the second housing portion 202 together define the assembly space; alternatively, the first housing portion 201 and the second housing portion 202 can both be hollow structures with one side open, and the opening side of the first housing portion 201 covers the opening side of the second housing portion 202. Of course, the housing 20 formed by the first housing portion 201 and the second housing portion 202 can be of various shapes, such as a cylinder, a cuboid, etc.

[0199] In battery 100, there are one or more battery cells 10. When there are multiple battery cells 10, they can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 10 are connected in both series and parallel. Multiple battery cells 10 can be directly connected in series, parallel, or in a mixed manner, and then the whole assembly of multiple battery cells 10 is housed in housing 20. Of course, battery 100 can also be composed of multiple battery cells 10 first connected in series, parallel, or in a mixed manner to form a battery pack, and then multiple battery packs are connected in series, parallel, or in a mixed manner to form a whole assembly, which is also housed in housing 20. Battery 100 may also include other structures. For example, battery 100 may also include a busbar component for realizing the electrical connection between multiple battery cells 10.

[0200] Please refer to Figure 3 and Figure 4 , Figure 3 This is a schematic diagram of a battery cell 10 provided in some embodiments of this application. Figure 4 for Figure 3 Another schematic diagram of the battery cell 10 shown. The battery cell 10 is cuboid, with its length direction being the first direction X, its thickness direction being the second direction Y, and its height direction being the third direction Z. The first direction X, the second direction Y, and the third direction Z are all perpendicular to each other. However, this is not a limitation; in other embodiments of this application, the battery cell 20 may also be cylindrical, flat, or other shapes.

[0201] Please refer to Figures 5-8 , Figure 5This is a schematic diagram of a battery cell 10 provided in some embodiments of this application. Figure 6 for Figure 5 A partial schematic diagram of the battery cell 10 shown. Figure 7 for Figure 5 Another schematic diagram of the battery cell 10 shown. Figure 8 This is a cross-sectional view of a battery cell 10 provided in some embodiments of this application. In the embodiments of this application, the battery cell 10 includes a housing assembly 1 and a cell assembly 2.

[0202] The housing assembly 1 includes a housing 11 and a first electrode post 12. The housing 11 has a first wall 110, and the first wall 110 forms a mounting hole 113. The first electrode post 12 is disposed in the mounting hole 113 so as to facilitate electrical connection between the first electrode post 12 and the cell assembly 2. The axial direction of the mounting hole 113 is the third direction Z.

[0203] The shape of the casing 11 is adjusted according to the type of battery cell 10. The type of battery cell 10 in the embodiments of this application is not limited. For example, when the battery cell 10 is a square battery, the casing 11 is square, and when the battery cell 10 is a cylindrical battery, the casing 11 is cylindrical. The embodiments of this application are all described with the casing 11 being square as an example.

[0204] The casing 11 is provided with terminals for electrical connection to the cell assembly 2 to ensure the normal charging and discharging operation of the battery cell 10. Generally, there are at least two terminals, specifically at least one positive terminal and at least one negative terminal. For example, when there are two terminals, one is the positive terminal and the other is the negative terminal, and they are electrically connected to the positive and negative output positions of the cell assembly 2, respectively. Another example is when there are four terminals, two of which can be positive terminals and the other two negative terminals. At least one of the terminals is the first terminal 12, which can serve as either a positive or negative terminal.

[0205] In the embodiments of this application, the cell assembly 2 includes an active material coating portion 21 and a conductive portion 22. The active material coating portion 21 is housed in the housing 11. The active material coating portion 21 is the part of the cell assembly 2 coated with active material, which can assist in the deintercalation and deintercalation of metal ions during the charging and discharging process of the battery cell 10. The conductive portion 22 is a metal structure that electrically connects the active material coating portion 21 and the first electrode post 12, and it is not coated with active material.

[0206] The active material coating section 21 is divided into a positive electrode active material coating section and a negative electrode active material coating section. The positive electrode active material coating section includes the portion of the positive electrode current collector coated with a positive electrode active material layer, and the negative electrode active material coating section includes the portion of the negative electrode current collector coated with a negative electrode active material layer. The conductive section 22 is divided into a positive electrode conductive section and a negative electrode conductive section. The positive electrode conductive section is electrically connected to the positive electrode active material coating section and the positive electrode post, and the negative electrode conductive section is electrically connected to the negative electrode active material coating section and the negative electrode post.

[0207] Please refer to this again. Figures 5 to 8 In the embodiments of this application, the first electrode post 12 includes a first welding surface 120, and the conductive part 22 includes a second welding surface 220. The second welding surface 220 is in contact with the first welding surface 120, and a portion of the second welding surface 220 is partially welded to the first welding surface 120 through a welding part 9, so as to achieve welding and fixing of the first electrode post 12 and the conductive part 22, and realize the electrical connection between the first electrode post 12 and the conductive part 2, thereby making the conductive part 22 used for electrical connection between the active material coating part 21 and the first electrode post 12.

[0208] The first welding surface 120 and the second welding surface 220 can be planar or curved, and the shapes of the first welding surface 120 and the second welding surface 220 are compatible; for example, both the first welding surface 120 and the second welding surface 220 are formed as planar surfaces, and the first welding surface 120 and the second welding surface 220 are arranged in parallel (e.g. Figure 8 (as shown); for example, both the first welding surface 120 and the second welding surface 220 are formed as curved surfaces.

[0209] The first welding surface 120 and the second welding surface 220 are in contact, which can be understood as at least a portion of the first welding surface 120 being in contact with at least a portion of the second welding surface 220, so that a portion of the second welding surface 220 is partially welded to a portion of the first welding surface 120 through the welding part 9. Then, taking the plane where the cross-section of the mounting hole 113 is located as the projection plane Ω, along the direction perpendicular to the projection plane Ω, the outer contour of the orthographic projection of the welding part 9 is within the range of the outer contour of the projection of the second welding surface 220 on the projection plane Ω, and the outer contour of the orthographic projection of the welding part 9 is within the range of the outer contour of the projection of the first welding surface 120 on the projection plane Ω, which facilitates the welding operation of the first pole post 12 and the conductive part 22.

[0210] Among them, such as Figures 5-8As shown, with the plane containing the cross-section of the mounting hole 113 as the projection plane Ω, along a direction perpendicular to the projection plane Ω, the outer contour of the projection of the second welding surface 220 onto the projection plane Ω is within the range of the outer contour of the projection of the first welding surface 120 onto the projection plane Ω. That is, along the axial direction Z of the mounting hole 113, the outer contour of the projection of the second welding surface 220 onto the projection plane Ω is within the range of the outer contour of the projection of the first welding surface 120 onto the projection plane Ω. The first welding surface 120 can correspond to the area on the first pole post 12 that can be welded to the conductive part 22, and the second welding surface 220 can correspond to the area on the conductive part 22 that can be welded to the first pole post 12.

[0211] For example, in Figure 6 In the example, the outer contour of the orthographic projection of the first welding surface 120 on the projection surface Ω is roughly formed as a racetrack shape (the racetrack shape is a closed ring structure formed by two straight lines and two arcs, with the two straight lines facing each other and spaced apart, and the two arcs connecting the two ends of the two straight lines respectively), and the outer contour of the orthographic projection of the second welding surface 220 on the projection surface Ω is roughly formed as a square, the square area being located within the aforementioned racetrack-shaped contour, and the orthographic projection of the welding part 9 on the projection surface Ω being located within the aforementioned square area.

[0212] In the above technical solution, the area of the first pole 12 that can be welded to the conductive part 22 is larger than the area of the conductive part 22 that can be welded to the first pole 12, so as to achieve an ultra-large setting of the first pole 12. On the one hand, while keeping the size of the conductive part 22 unchanged, making the first pole 12 larger can ensure the current-carrying area of the conductive part 22 and increase the current-carrying area of the first pole 12. At the same time, the ultra-large setting of the first pole 12 can make the busbar component electrically connected to the first pole 12 relatively large, so that the area of the busbar component used for electrical connection (e.g., welding) with the first pole 12 can be set to be larger, which can also increase the current-carrying area of the busbar component. Meanwhile, the increased current-carrying area of the conductive part 22, the first terminal 12, and the busbar assembly not only reduces resistance and improves temperature rise during charging and discharging to enhance the reliability of the battery cell 10, but also increases current to improve the fast-charging performance of the battery cell 10. On the other hand, the extra-large design of the first terminal 12 provides a larger welding space, increasing the welding space between the first terminal 12 and the conductive part 22, and also increasing the welding space between the first terminal 12 and the busbar assembly. Therefore, the welding reliability and stability are higher, which can further improve the reliability and stability of the battery cell 10.

[0213] Optionally, the conductive part 22 and the first pole post 12 are laser welded to form a welded part 9; but not limited thereto, for example, in other embodiments, the two can also be electrically connected by conductive structural adhesive.

[0214] In some embodiments, reference Figure 6 and Figure 8Along the direction perpendicular to the projection plane Ω, the projected area of the welded part 9 on the projection plane Ω is greater than or equal to 0.15% of the projected area of the first wall 110 on the projection plane Ω.

[0215] In the above technical solution, by setting the positive projection area of the welding part 9 on the projection plane Ω to be greater than or equal to 0.15% of the positive projection area of the first wall 110 on the projection plane Ω, the effective current flow area between the conductive part 22 and the first electrode post 12 can be further increased, thereby improving the fast charging performance of the battery cell 10.

[0216] In some embodiments, reference Figure 6 and Figure 8 The projected area of welded part 9 on the projection surface is greater than or equal to 5mm². 2 For example, the projected area of welded part 9 on the projection surface can be 5mm². 2 6mm 2 8mm 2 9mm 2 or 10mm 2 etc.

[0217] In the above technical solution, the projected area of the welding part 9 on the projection surface is greater than or equal to 5mm. 2 This is to effectively improve the current flow capacity and heat diffusion capacity of the first pole 12.

[0218] For example, in Figure 6 In the example, the projection of the welded part 9 onto the projection plane Ω extends into a long strip shape. Figure 20 This is a schematic diagram of the welding between the first electrode post and the conductive part provided in some embodiments of this application, and the corresponding weld is... Figure 20 As shown in the spiral elongated shape, taking the projection of the welded part 9 on the projection plane Ω as an example where the projection extends along a straight line, the length of the projection of the welded part 9 on the projection plane is greater than or equal to 10 mm, and the width of the projection of the welded part 9 on the projection plane Ω is greater than or equal to 5 mm; of course, the projection of the welded part 9 on the projection plane Ω can also extend along a curve (including but not limited to this smooth curve, broken line), for example, the projection of the welded part 9 on the projection plane Ω can extend into a closed ring (e.g., a circular ring, a polygonal ring, etc.). In addition, the shape of the projection of the welded part 9 on the projection plane Ω can also be a solid circle.

[0219] Furthermore, the projected area of the welded part 9 on the projection plane Ω is greater than or equal to 7 mm². 2 For example, the projected area of weld 9 on projection plane Ω can be 7 mm. 2 7.8mm 2 9.5mm 2 or 11mm 2 etc.

[0220] For example, taking the shape of the projection of the welding part 9 on the projection plane Ω as a solid circle, the diameter of the circle corresponding to the projection of the welding part 9 on the projection plane Ω is greater than or equal to 3mm.

[0221] In some embodiments, reference Figure 6 and Figure 8 If the projected area of the welding part 9 on the projection plane Ω is greater than or equal to 20% of the projected area of the second welding surface 220 on the projection plane Ω along the direction perpendicular to the projection plane Ω, then the projected area of the welding part 9 on the projection plane Ω has a suitable proportion, so as to facilitate the welding operation between the conductive part 22 and the first electrode 12 under the premise of appropriately improving the current flow capacity and heat diffusion capacity of the first electrode 12.

[0222] For example, the orthographic projection area of the welded part 9 on the projection plane Ω is 20%, 25%, 35%, 40%, 50%, or 60% of the projection area of the second welded surface 220 on the projection plane Ω, etc.

[0223] Please refer again to some embodiments of this application. Figure 8 The first electrode post 12 includes an electrode post body 12a, a first limiting platform 12b, and a second limiting platform 12c. The electrode post body 12a passes through the mounting hole 113. The first limiting platform 12b and the second limiting platform 12c are arranged at both ends of the electrode post body 12a in a direction perpendicular to the projection plane Ω. The first limiting platform 12b is fitted to the outer side of the housing 11, and the second limiting platform 12c is fitted to the inner side of the housing 11, so that the first electrode post 12 is riveted to the housing 11. The direction perpendicular to the projection plane Ω can be understood as the axial direction of the mounting hole 113, that is, the third direction Z. The end face of the second limiting platform 12c near the cell assembly 2 forms a first welding surface 120.

[0224] As can be seen, the first limiting platform 12b and the second limiting platform 12c extend radially along the mounting hole 113 to the radially outer side of the peripheral wall of the mounting hole 113. The first limiting platform 12b and the second limiting platform 12c can restrict the movement of the first pole post 12 relative to the housing 11 in the axial direction (third direction Z) of the mounting hole 113, thereby making it easy for the first pole post 12 to be reliably installed at the mounting hole 113 through the first limiting platform 12b and the second limiting platform 12c, realizing the fixed connection between the first pole post 12 and the housing 11, and facilitating the assembly of the first pole post 12 and the housing 11. At the same time, riveting the first pole post 12 to the housing 11 can easily achieve a reliable connection between the first pole post 12 and the housing 11 without the need for other connection methods, which helps to simplify the structure of the housing assembly 1 and simplify the assembly process of the housing assembly 1.

[0225] Furthermore, in the above technical solution, the end face of the second limiting stage 12c near the cell assembly 2 forms a first welding surface 120, which facilitates reducing the distance between the first welding surface 120 and the cell assembly 2, which is beneficial to shortening the length of the conductive part 22, saving the space occupied by the conductive part 22 in the internal space of the housing 11, and facilitating the improvement of the volumetric energy density of the battery cell 10.

[0226] In some embodiments, such as Figure 8 As shown, the pole body 12a, the first limiting platform 12b, and the second limiting platform 12c are integrally formed, that is, the pole body 12a, the first limiting platform 12b, and the second limiting platform 12c are integrally formed parts.

[0227] In the above technical solution, since the electrode body 12a, the first limiting platform 12b, and the second limiting platform 12c are integrally formed, it can save parts and reduce costs. At the same time, it is easy to ensure the strength of the first electrode 12, so that after the first electrode 12 is engaged with the housing 11, it is not easy for the first electrode 12 to detach from the housing 11 due to vibration or external pulling during the charging and discharging process of the battery cell 10, nor is it easy for it to crack or be damaged due to vibration or external pulling. This can improve the stability and reliability of the housing assembly 1, thereby improving the stability and reliability of the battery cell 10.

[0228] Of course, in other embodiments of this application, at least one of the first limiting stage 12b and the second limiting stage 12c is a separate component from the pole body 12a.

[0229] In some embodiments of this application, such as Figures 7-10As shown, the length L5 of the pole body 12a in the first direction X is greater than or equal to 1 / 3 of the length a0 of the first wall 110 in the first direction X. For example, L5 can be a0 / 3, 0.35*a0, or 0.42*a0, etc.; the width L6 of the pole body 12a in the second direction Y is greater than or equal to 1 / 2 of the width b0 of the first wall 110 in the second direction Y. For example, L6 can be b0 / 2, 0.55*b0, 0.6*b0, or 0.68*b0, etc.; the ratio of the circumference of the pole body 12a in the circumferential direction that mates with the mounting hole 113 to the circumference of the first wall 110 is within the range of 25% to 40%, that is, the circumference of the pole body 12a in the circumferential direction that mates with the mounting hole 113 is greater than or equal to 25% of the circumference of the first wall 110, and less than or equal to the circumference of the first wall 110. The length is 40%, for example, the circumference of the pole body 12a that mates with the mounting hole 113 can be 25%, 25.8%, 26%, 26.6%, 30%, 32%, 35%, 38%, or 40% of the circumference of the first wall 110; the cross-sectional area of the part of the pole body 12a that mates with the mounting hole 113 is greater than or equal to 10% of the area of the first wall 110, for example, the cross-sectional area of the part of the pole body 12a that mates with the mounting hole 113 can be 10%, 10.6%, 11%, 11.5%, or 12% of the area of the first wall 110; along the axial direction Z of the mounting hole 113, the ratio of the thickness dimension t of the pole body 12a to the thickness dimension t0 of the first wall 110 is greater than 1 and less than 1.5, for example, this ratio can be 1.1, 1.15, 1.2, 1.3, or 1.45. Of course, in other embodiments, only some of the above conditions may be satisfied, and this application embodiment does not limit this.

[0230] In the above technical solution, when at least one of the following ratios—the length ratio of the electrode body 12a to the length of the first wall 110, the width ratio of the electrode body 12a to the width of the first wall 110, and the ratio of the perimeter of the electrode body 12a mating with the mounting hole 113 to the perimeter of the first wall 110—satisfies the corresponding ranges, the electrode body 12a has a larger proportion in both the length and width directions of the first wall 110, and the mating portion of the electrode body 12a with the mounting hole 113 is larger. This improves the stability of the riveting between the first electrode 12 and the first wall 110, ensures the riveting strength of the first electrode 12, and thus improves the battery's single-cell performance. The reliability and stability of the body 10 are improved. When the ratio of the cross-sectional area of the electrode body 12a to the area of the first wall 110 is within the above-mentioned range, the current-passing area of the first electrode 12 is large, which can improve the current-passing and fast-charging capabilities of the first electrode 12. When the ratio of the thickness of the electrode body 12a to the thickness of the first wall 110 meets the above-mentioned corresponding range, it is convenient for the electrode body 12a to reliably fit into the mounting hole 113, so that the first limiting platform 12b and the second limiting platform 12c are located on the inner and outer sides of the housing 11 respectively, so as to achieve smooth riveting of the first electrode 12 and improve the riveting convenience and reliability. At the same time, when all parameters of the electrode body 12a are within the above-mentioned range, the number of first electrodes 12 on the first wall 110 can be one or more, especially two, and the two first electrodes 12 are spaced apart along the second direction Y. The polarities of the two first electrodes 12 can be the same or opposite. Of course, the number of first electrodes 12 on the first wall 110 can also be four.

[0231] It is understood that, in the embodiments of this application, the perimeter of the first wall 110 can be understood as the perimeter of the outer contour of the projection of the first wall 110 on the projection plane Ω. For example, the first wall 110 is roughly formed into a rectangular structure, and the outer contour of the projection of the first wall 110 on the projection plane Ω is also roughly a rectangular structure. The perimeter of the first wall 110 can be simply understood as (2*a0+2*b0).

[0232] Optionally, the circumferential circumference of the pole body 12a that mates with the mounting hole 113 is greater than or equal to 26.5% of the circumference of the first wall 110, and less than or equal to 40% of the circumference of the first wall 110. For example, the circumferential circumference of the pole body 12a that mates with the mounting hole 113 is 26.5%, 27%, 27.2%, 27.7%, or 28% of the circumference of the first wall 110, etc., which helps to further ensure the riveting fit length between the first pole 12 and the housing 11, improve the riveting reliability, and at the same time take into account the reliability of the first wall 110 in use.

[0233] Optionally, the cross-sectional area of the portion of the pole body 12a that mates with the mounting hole 113 is greater than or equal to 11.6% of the area of the first wall 110. For example, the cross-sectional area of the portion of the pole body 12a that mates with the mounting hole 113 is 11.6%, 12%, 12.4%, 12.7%, or 13.8% of the area of the first wall 110, etc., which helps to further ensure the riveting mating area between the first pole 12 and the housing 11 and improve the riveting reliability.

[0234] Optionally, the length L5 of the pole body 12a in the first direction X is greater than or equal to 40 mm, for example, L5 can be 40 mm, 43 mm, 46 mm, 50 mm, or 52 mm, etc.; the width L6 of the pole body 12a in the second direction Y is greater than or equal to 15 mm, for example, L5 can be 15 mm, 15.5 mm, 16 mm, 16.2 mm, or 17 mm, etc.; and / or, the cross-sectional area of the portion of the pole body 12a that mates with the mounting hole 113 is greater than or equal to 600 mm². 2 For example, the cross-sectional area of the part of the pole body 12a that mates with the mounting hole 113 is 600 mm². 2 630mm 2 680mm 2 or 700mm 2 wait.

[0235] For example, Figure 9 A schematic diagram of a battery cell provided in some embodiments of this application; Figure 10 For is Figure 9 The diagram shown depicts the first pole and the first wall. Figure 11 The above are schematic diagrams of individual battery cells provided in some embodiments of this application. Figure 12 For is Figure 11 A schematic diagram of the first pole and the first wall shown. Please refer to [link / reference]. Figures 7 to 12In the embodiments of this application, two mounting holes 113 are formed on the first wall 110, and each mounting hole 113 is respectively provided with a first pole post 12, the two first pole posts 12 having opposite polarities; wherein, each first pole post 12 satisfies at least one of the following conditions: the length L5 of the pole post body 12a in the first direction X is greater than or equal to 1 / 3 of the length a0 of the first wall 110 in the first direction X; the width L6 of the pole post body 12a in the second direction Y is greater than or equal to 1 / 3 of the length a0 of the first wall 110 in the second direction Y. The width dimension b0 in the Y direction is 1 / 2; the circumference of the pole body 12a that mates with the mounting hole 113 is greater than or equal to 25% of the circumference of the first wall 110; the cross-sectional area of the part of the pole body 12a that mates with the mounting hole 113 is greater than or equal to 10% of the area of the first wall 110; along the axial direction Z of the mounting hole 113, the thickness dimension t of the pole body 12a is greater than or equal to 0.6 of the thickness dimension t0 of the first wall 110, and t is less than or equal to 1.5 of the thickness dimension t0 of the first wall 110.

[0236] In some embodiments of this application, such as Figures 7-10As shown, the ratio of the length L1 of the first limiting platform 12b in the first direction X to the length a0 of the first wall 110 in the first direction X is within the range of 1 / 3 to 1 / 2, that is, a0 / 3 ≤ L1 ≤ a0 / 2. For example, L1 can be a0 / 3, 0.34*a0, 0.36*a0, 0.39*a0, 0.4*a0, 0.42*a0, 0.45*a0, 0.47*a0, 0.49*a0, or 0.5*a0, etc.; the ratio of the width L2 of the first limiting platform 12b in the second direction Y to the length a0 of the first wall 110 in the second direction Y is within the range of 1 / 3 to 1 / 2, that is, a0 / 3 ≤ L1 ≤ a0 / 2. The ratio of the width dimension b0 in the Y direction is within the range of 1 / 2 to 3 / 4, that is, b0 / 2 ≤ L2 ≤ 3*b0 / 4. For example, L2 can be 0.5*b0, 0.52*b0, 0.54*b0, 0.55*b0, 0.58*b0, 0.6*b0, 0.62*b0, 0.65*b0, 0.7*b0, 0.75*b0, etc.; the first limiting platform 12b is columnar, and the ratio of the perimeter of the first limiting platform 12b to the perimeter of the first wall 110 is within the range of 30% to 50%, that is, the ratio of the width dimension b0 in the Y direction is within the range of 1 / 2 to 3 / 4. The perimeter of the outer circumference of the first limiting platform 12b is greater than or equal to 30% of the perimeter of the first wall 110, and less than or equal to 50% of the perimeter of the first wall 110. For example, the perimeter of the outer circumference of the first limiting platform 12b is 30%, 35%, 38%, 40%, 42%, 46%, 48%, or 50% of the perimeter of the first wall 110, etc.; the ratio of the cross-sectional area S1 of the first limiting platform 12b to the area of the first wall 110 is within the range of 9% to 25%, that is, 9%*S0≤S1≤25%*S0. The cross-section of the first limiting platform 12b and the mounting hole 113... The axial direction Z is perpendicular to the first wall 110. For example, the cross-sectional area S1 of the first limiting platform 12b is equal to the area S0 of the first wall 110. For example, S1 can be 9.4%*S0, 10.4%*S0, 13.6%*S0, 15.2%*S0, 18%*S0, 21%*S0, 22%*S0, 23.2%*S0, 24%*S0, or 25%*S0, etc. Along the axial direction Z of the mounting hole 113, the ratio of the thickness t1 of the first limiting platform 12b to the thickness t0 of the first wall 110 is within the range of 0.6 to 1.5, that is, 0.6≤t1 / t0≤1.5. Of course, in other embodiments, only some of the above conditions may be satisfied, and this application embodiment does not limit this.

[0237] In the above technical solution, when at least one of the following ratios—the length ratio of the first limiting platform 12b to the length of the first wall 110, the width ratio of the first limiting platform 12b to the width of the first wall 110, and the perimeter ratio of the first limiting platform 12b to the perimeter of the first wall 110—satisfies the corresponding ranges described above, the proportion of the first limiting platform 12b in the length and width directions of the first wall 110 is large, and the size of the mating portion between the first limiting platform 12b and the mounting hole 113 is large. This improves the stability of the riveting between the first electrode post 12 and the first wall 110, ensures the riveting strength of the first electrode post 12, and thus improves the reliability of the battery cell 10. Stability; when the ratio of the cross-sectional area of the first limiting platform 12b to the area of the first wall 110 is within the above-mentioned range, the current-carrying area of the first electrode post 12 is large, which can improve the current-carrying and fast-charging capabilities of the first electrode post 12; when the ratio of the thickness of the first limiting platform 12b to the thickness of the first wall 110 meets the above-mentioned corresponding range, it is easier to avoid the first electrode post 12 easily separating from the first wall 110, further improving the riveting reliability, and also helping to reduce the thickness of the portion of the first limiting platform 12b protruding outside the housing 11, reducing the space occupied by the first electrode post 12 outside the housing 11, which is beneficial to improving the volumetric energy density of the battery 100. At the same time, when all parameters of the first limiting platform 12b are within the above-mentioned range, the number of first electrode posts 12 of the same polarity on the first wall 110 can be one or more, especially two, and the two first electrode posts 12 are spaced apart along the second direction Y. Of course, the number of first electrode posts 12 of the same polarity can also be four.

[0238] In the above technical solution, the first limiting platform 12b is columnar, which can refer to the first limiting platform 12b being a solid column or the first limiting platform 12b being a hollow column. In this case, the first limiting platform 12b has a through hole that passes through the first limiting platform 12b along the axial direction Z of the mounting hole 113 (for example, the receiving part 121 described later is formed in the first limiting platform 12b), which helps to reduce the weight of the first pole post 12.

[0239] In the above technical solution, by setting a0 / 3≤L1≤a0 / 2, it is possible to improve the riveting stability between the first pole post 12 and the housing 11, while also taking into account the reliability of the first wall 110 and the matching of the number of pole posts 12 required to be arranged in the first wall 110.

[0240] In the above technical solution, by setting b0 / 2≤L2≤3*b0 / 4, it is also convenient to improve the riveting stability of the first pole post 12 and the housing 11, while taking into account the reliability of the first wall 110 and the matching of the number of pole posts 12 required to be arranged in the first wall 110.

[0241] In the above technical solution, the first limiting platform 12b is set in the shape of a column, and the ratio of the perimeter of the first limiting platform 12b to the perimeter of the first wall 110 is in the range of 30% to 50%. This is so as to improve the reliability of the riveting between the first pole post 12 and the housing 11, while taking into account the reliability of the first wall 110 and the matching of the number of pole posts 12 required to be arranged in the first wall 110.

[0242] In the above technical solution, by setting 9%*S0≤S1≤25%*S0, the reliability of the first pole post 12 and the housing 11 can be improved while taking into account the reliability of the first wall 110.

[0243] As an example, in Figure 7 , Figure 9 and Figure 10 In the example, two mounting holes 113 are formed on the first wall 110, and each mounting hole 113 is respectively provided with a first pole post 12, the polarities of the two first pole posts 12 are opposite; wherein, each first pole post 12 satisfies at least one of the following conditions: the length dimension L1 of the first limiting platform 12b in the first direction X is greater than or equal to 1 / 3 of the length dimension a0 of the first wall 110 in the first direction X; the width dimension L2 of the first limiting platform 12b in the second direction Y is greater than or equal to the width dimension L2 of the first wall 110 in the second direction Y. The width dimension b0 is 1 / 2; the first limiting platform 12b is columnar, and the perimeter of the outer circumference of the first limiting platform 12b is greater than or equal to 30% of the perimeter of the first wall 110; the cross-sectional area S1 of the first limiting platform 12b is greater than or equal to 9% of the area S0 of the first wall 110; along the axial direction Z of the mounting hole 113, the thickness dimension t1 of the first limiting platform 12b is greater than or equal to 0.6 of the thickness dimension t0 of the first wall 110, and t1 is less than or equal to 1.5 of the thickness dimension t0 of the first wall 110.

[0244] In some embodiments of this application, such as Figures 7-10As shown, the ratio of the length L3 of the second limiting platform 12c in the first direction X to the dimension a0 of the first wall 110 in the first direction X is within the range of 1 / 3 to 1 / 2, that is, a0 / 3 ≤ L3 ≤ a0 / 2. For example, the length L3 of the second limiting platform 12c in the first direction X is a0 / 3, 0.35*a0, 0.4*a0, 0.42*a0, 0.47*a0, or 0.5*a0, etc.; the ratio of the width L4 of the second limiting platform 12c in the second direction Y to the width b0 of the first wall 110 in the second direction Y is within the range of 1 / 3 to 1 / 2. Within the range of b0 / 2 to 3 / 4, i.e., b0 / 2 ≤ L4 ≤ 3*b0 / 4, for example, the width dimension L4 of the second limiting platform 12c in the second direction Y is b0 / 2, 0.52*b0, 0.55*b0, 0.58*b0, 0.6*b0, 0.62*b0, 0.67*b0, 0.7*b0, etc.; the second limiting platform 12c is columnar, and the ratio of the perimeter of the second limiting platform 12c to the perimeter of the first wall 110 is within the range of 30% to 50%, i.e., the perimeter of the second limiting platform 12c is greater than or equal to the perimeter of the first wall 110. The perimeter of the second limiting platform 12c is 30% of the perimeter of the first wall 110, and less than or equal to 50% of the perimeter of the first wall 110. For example, the perimeter of the second limiting platform 12c is 30%, 32%, 35%, 38%, 40%, 42%, 45%, 47%, or 50% of the perimeter of the first wall 110. The ratio of the cross-sectional area S2 of the second limiting platform 12c to the area S0 of the first wall 110 is in the range of 9% to 25%, that is, 9%*S0≤S2≤25%*S0. For example, the cross-sectional area S2 of the second limiting platform 12c is 9%*S0 or 9.4%*S0. The thicknesses are 9.9%*S0, 10.3%*S0, 11%*S0, 11.4%*S0, 12%*S0, 13%*S0, 14%*S0, 14.5%*S0, 15.6%*S0, 16%*S0, 17%*S0, 18.6%*S0, 19.2%*S0, 20%*S0, or 25%*S0, etc. Along the axial direction Z of the mounting hole 113, the ratio of the thickness dimension t2 of the second limiting platform 12c to the thickness dimension t0 of the first wall 110 is within the range of 0.6 to 1.5, i.e., 0.6 ≤ t2 / t0 ≤ 1.5. Of course, in other embodiments, only some of the above conditions may be satisfied; this application does not limit this.

[0245] In the above technical solution, when at least one of the following ratios—the length ratio of the second limiting platform 12c to the length of the first wall 110, the width ratio of the second limiting platform 12c to the width of the first wall 110, and the circumference ratio of the second limiting platform 12c to the circumference of the first wall 110—satisfies the corresponding ranges described above, the second limiting platform 12c has a larger proportion in both the length and width directions of the first wall 110. This results in a larger size for the portion of the second limiting platform 12c that mates with the mounting hole 113. This improves the stability of the riveting between the first electrode post 12 and the first wall 110, ensuring the riveting strength of the first electrode post 12 and thus enhancing the reliability of the battery cell 10. Stability; when the ratio of the cross-sectional area of the second limiting platform 12c to the area of the first wall 110 is within the above-mentioned range, the current-carrying area of the first electrode post 12 is large, which can improve the current-carrying and fast-charging capabilities of the first electrode post 12; when the ratio of the thickness of the second limiting platform 12c to the thickness of the first wall 110 meets the above-mentioned corresponding range, it is easier to avoid the first electrode post 12 easily separating from the first wall 110, further improving the riveting reliability, and also helps to reduce the thickness of the part of the second limiting platform 122 protruding into the housing 11, reducing the space occupied by the first electrode post 12 in the housing 11, which is beneficial to improving the volumetric energy density of the battery cell 10. At the same time, when all parameters of the second limiting platform 12c are within the above-mentioned range, the number of first electrode posts 12 of the same polarity on the first wall 110 can be one or more, especially two, and the two first electrode posts 12 are spaced apart along the second direction Y. Of course, the number of first electrode posts 12 of the same polarity can also be four.

[0246] In the above technical solution, the second limiting platform 12c is columnar, which can refer to the second limiting platform 12c being a solid column or a hollow column. In this case, the second limiting platform 12c forms a through hole that penetrates the first limiting platform 12b along the axial direction Z of the mounting hole 113 (for example, the receiving part 121 described later is formed in the second limiting platform 12c), which is beneficial to reducing the weight of the first pole post 12.

[0247] In the above technical solution, by setting a0 / 3≤L3≤a0 / 2, it is possible to improve the riveting stability between the first pole post 12 and the housing 11, while also taking into account the reliability of the first wall 110 and the matching of the number of pole posts 12 required to be arranged in the first wall 110.

[0248] In the above technical solution, by setting b0 / 2≤L4≤3*b0 / 4, it is also convenient to improve the riveting stability of the first pole post 12 and the housing 11, while taking into account the reliability of the first wall 110 and the matching of the number of pole posts 12 required to be arranged in the first wall 110.

[0249] In the above technical solution, by setting 9%*S0≤S2≤25%*S0, the reliability of the first pole post 12 and the housing 11 can be improved while taking into account the reliability of the first wall 110.

[0250] For example, in Figure 7 , Figure 9 and Figure 10 In the example, two mounting holes 113 are formed on the first wall 110, and each mounting hole 113 is respectively provided with a first pole post 12. The polarities of the two first pole posts 12 are opposite, and each first pole post 12 satisfies at least one of the following conditions: the length dimension L3 of the second limiting stage 12c in the first direction X is greater than or equal to 1 / 3 of the length dimension a0 of the first wall 110 in the first direction X; the width dimension L4 of the second limiting stage 12c in the second direction Y is greater than or equal to the width dimension L4 of the first wall 110 in the second direction Y. The width dimension b0 is 1 / 2; the second limiting platform 12c is columnar, and the perimeter of the second limiting platform 12c is greater than or equal to 30% of the perimeter of the first wall 110; the cross-sectional area S2 of the second limiting platform 12c is greater than or equal to 9% of the area S0 of the first wall 110; along the axial direction Z of the mounting hole 113, the thickness dimension t2 of the second limiting platform 12c is greater than or equal to 0.6 of the thickness dimension t0 of the first wall 110, and t2 is less than or equal to 1.5 of the thickness dimension t0 of the first wall 110.

[0251] In some embodiments, such as Figure 8 As shown, a portion of the first pole post 12 is located inside the housing 11, and another portion of the first pole post 12 is located outside the housing 11. Taking the cross-section of the mounting hole 113 as the projection plane, along the direction perpendicular to the projection plane Ω, the projected area of the portion of the first pole post 12 located outside the housing 11 on the projection plane is greater than or equal to 2% of the projected area of the first wall 110 on the projection plane.

[0252] In the above technical solution, by setting the projected area of the portion of the first pole 12 located outside the housing 11 on the projection surface to be greater than or equal to 2% of the projected area of the first wall 110 on the projection surface, it is convenient to increase the area of the connectable region of the first pole 12 that can be connected to the busbar component, thereby increasing the connection area between the first pole 12 and the busbar component, increasing the effective current flow area between the first pole 12 and the busbar component, and improving the charging speed of the battery cell 10.

[0253] For example, the projected area of the portion of the first pole post 12 located outside the housing 11 on the projection surface is 2%, 3%, 4%, 5.5%, 6.8%, etc., of the projected area of the first wall 110 on the projection surface.

[0254] In some embodiments, such as Figure 8As shown, in the axial direction Z of the mounting hole 113, the thickness t1 of the first limiting platform 12b satisfies 2mm ≤ t1 ≤ 3.2mm. This balances the riveting strength between the first electrode post 12 and the housing 11, as well as the space occupied by the first electrode post 12 outside the housing 11. This avoids setting the thickness of the first limiting platform 12b too large to consider the riveting strength of the first electrode post 12, which would reduce the volumetric energy density of the battery cell 10. Conversely, it avoids setting the thickness of the first limiting platform 12b too small to consider the volumetric energy density of the battery cell 10, which would result in poor riveting strength of the first electrode post 12 at the first limiting platform 12b. For example, t1 can be 2mm, 2.3mm, 2.5mm, 2.8mm, 3mm, or 3.2mm, etc.

[0255] In some embodiments, such as Figure 8 As shown, in the axial direction Z of the mounting hole 113, the thickness t2 of the first limiting platform 12b satisfies t2≤2mm. This is to simultaneously consider the riveting strength between the first electrode post 12 and the housing 11, and the space occupied by the first electrode post 12 within the housing 11. This avoids setting the thickness of the second limiting platform 12c too large due to consideration of the riveting strength of the first electrode post 12, which would reduce the volumetric energy density of the battery cell 10. Conversely, it avoids setting the thickness of the second limiting platform 12c too small due to consideration of the volumetric energy density of the battery cell 10, which would result in poor riveting strength of the first electrode post 12 at the second limiting platform 12c. For example, t2 can be 2mm, 1.8mm, 1.7mm, or 1.6mm, etc.

[0256] In some embodiments, such as Figure 8 As shown, in the radial direction of the mounting hole 113, the width of the portion of the first limiting platform 12b extending beyond the outer peripheral wall of the pole body 12a is x, where x ≥ 1 mm, in order to further enhance the riveting strength between the first pole 12 and the housing 11. For example, x can be 1 mm, 1.5 mm, 1.8 mm, or 2 mm, etc.

[0257] It should be noted that the specific configuration of the battery cell assembly 2 in this application embodiment is not limited, and may include, but is not limited to, the following two implementation methods.

[0258] Combination Figure 8As shown, in the first embodiment, the conductive part 22 includes a plurality of tabs 2211 connected to the active material coating part 21. The ends of the plurality of tabs 2211 near the active material coating part 21 are gathered together (i.e., converged and gathered towards each other) to form a first gathered part 2212. The ends of the plurality of tabs 2211 away from the active material coating part 21 are gathered together and connected to form a second gathered part 2213. The first gathered part 2212 connects the second gathered part 2213 and the active material coating part 21. The second gathered part 2213 has a second welding surface 220 on its end face near the first electrode post 12. In this case, the second gathered part 2212 is welded and fixed to the first electrode post 12 by welding part 9.

[0259] In the above technical solution, when the multiple tabs 2211 form the first gathering portion 2212, they only converge (i.e., gather towards each other) but are not connected. However, when the multiple tabs 2211 form the second gathering portion 2213, they not only converge but are also connected into an integral structure. For example, the multiple tabs 2211 can be connected into an integral plate structure by welding (e.g., ultrasonic welding) to form the second gathering portion 2213. However, this application is not limited to this. For example, the multiple tabs 2211 can also be converged and connected to form the second gathering portion 2213 by means of conductive adhesive bonding, etc., which will not be elaborated here.

[0260] Furthermore, by setting the end face of the second gathering portion 2213 near the first electrode post 12 to form the second welding surface 220, it is beneficial to shorten the length of the conductive portion 22, save the space occupied by the conductive portion 22, and facilitate the improvement of the volumetric energy density of the battery cell 10.

[0261] It should be noted that, in the embodiments of this application, the tabs 2211 are divided into positive electrode tabs 2211 and negative electrode tabs 2211. The positive electrode tabs 2211 that need to be gathered together are stacked together and ultrasonically pre-welded to form the second gathered portion 2213 of the positive electrode. This reduces the interlayer gaps, allowing the loosely packed multiple positive electrode tabs 2211 to form a plate structure with a certain rigidity. Similarly, the negative electrode tabs 2211 that need to be gathered together are stacked together and ultrasonically pre-welded to form the second gathered portion 2213 of the negative electrode. This also reduces the interlayer gaps, allowing the loosely packed multiple negative electrode tabs 2211 to form a plate structure with a certain rigidity.

[0262] In the above technical solution, "the ends of multiple tabs 2211 close to the active material coating part 21 are gathered to form a first gathered part 2212, and the ends of multiple tabs 2211 away from the active material coating part 21 are gathered and connected to form a second gathered part 2213" is intended to illustrate that: along the extension direction of the tabs 2211, the first gathered part 2212 and the second gathered part 2213 are arranged sequentially along the direction away from the active material coating part 21, and the specific positions of the first gathered part 2212 and the second gathered part 2213 are not limited, that is, it is not required that the first gathered part 2212 is close to the active material coating part 21, nor is it required that the second gathered part 2213 is far from the active material coating part 21.

[0263] For example, the active material coating part 21 includes a current collector 211 and an active material layer 212 disposed on the current collector 211. The conductive part 22 includes a tab part 221 electrically connected to the current collector 211. The tab part 221 includes a plurality of tab pieces 2211. The tab pieces 2211 are electrically connected to the current collector 211 but are not coated with active material. They can be formed by direct die cutting from the current collector 211. The plurality of tab pieces 2211 converge at positions close to the current collector 211 (i.e., converge towards each other) to form a first convergence part 2212. The plurality of tab pieces 2211 converge at positions away from the current collector 211 and connect to form a second convergence part 2213. The first convergence part 2212 connects the second convergence part 2213 and the active material coating part 21.

[0264] In some alternative examples, the current collector 211 and the tab 2211 can be a single piece, for example, for the positive electrode, it can be a single piece of aluminum foil, and for the negative electrode, it can be a single piece of copper foil, and so on.

[0265] Combination Figure 8 In the first embodiment, as an optional solution, the plane where the cross-section of the mounting hole 113 is located is the projection plane Ω. Along the direction perpendicular to the projection plane Ω, at least a portion of the outer contour of the projection of the first gathering portion 2212 on the projection plane Ω is located within the range of the outer contour of the projection of the first welding surface 120 on the projection plane Ω.

[0266] For example, in Figure 8 In the example, along the direction perpendicular to the projection plane Ω, the projection of the first gathering portion 2212 on the projection plane Ω is located within the outer contour range of the projection of the first welding surface 120 on the projection plane Ω; in Figure 22 In the example, along the direction perpendicular to the projection plane Ω, a portion of the projection of the first gathering portion 2212 on the projection plane Ω is located within the outer contour range of the projection of the first welding surface 120 on the projection plane Ω, while another portion of the projection of the first gathering portion 2212 on the projection plane Ω is located outside the outer contour range of the projection of the first welding surface 120 on the projection plane Ω.

[0267] In the above technical solution, by setting at least a portion of the outer contour of the projection of the first gathering part 2212 on the projection plane Ω to be within the range of the outer contour of the projection of the first welding surface 120 on the projection plane Ω, it is beneficial to save the space occupied by the first gathering part 2212 in the axial direction of the vertical mounting hole 113, and to reduce the distance between the first pole post 12 and the cell assembly 2 in the axial direction of the mounting hole 113, so as to improve the energy density of the battery cell 10.

[0268] Combination Figure 8 In the first embodiment, as an optional solution, a portion of the end face of the second gathering portion 2213 near the first pole post 12 forms a second welding surface 220. Along the direction perpendicular to the projection plane Ω, the projected area of the second welding surface 220 on the projection plane Ω is greater than or equal to 40% of the projected area of the second gathering portion 2213 on the projection plane Ω, so that the second gathering portion 2213 can provide a sufficient welding area.

[0269] For example, the projected area of the second welding surface 220 on the projection surface Ω is 40%, 45%, 50%, 65%, or 70% of the projected area of the second gathering part 2213 on the projection surface Ω, etc.

[0270] Figure 21 This is a cross-sectional view of a battery cell provided in some embodiments of this application, in conjunction with... Figure 21 As shown, in the second embodiment, the conductive part 22 includes a plurality of tabs 2211 connected to the active material coating part 21 and an adapter piece 222. The ends of the plurality of tabs 2211 near the active material coating part 21 are gathered to form a first gathered part 2212, and the ends of the plurality of tabs 2211 away from the active material coating part 21 are gathered and connected to form a second gathered part 2213. The first gathered part 2212 connects the second gathered part 2213 and the active material coating part 21, and the adapter piece 222 connects the second gathered part 2213 and the first electrode post 12. A second welding surface 220 is formed on a portion of the end face of the adapter piece 222 near the first electrode post 12.

[0271] In the above technical solution, the second gathering part 2213 and the first pole post 12 are indirectly electrically connected by using an adapter piece 222. The adapter piece 222 can be welded to the first pole post 12 by avoiding the part of the second gathering part 2213, thereby making the welding between the adapter piece 222 and the first pole post 12 more reliable, reducing the risk of welding cracking, and further improving the reliability and stability of the battery cell 10. At the same time, the electrical connection between the first pole post 12 and the tab 2211 by the adapter piece 222 can also simplify the structure of the tab 2211.

[0272] For example, the active material coating part 21 includes a current collector 211 and an active material layer 212 disposed on the current collector 211. The conductive part 22 includes a tab part 221 and an adapter piece 222. The tab part 221 includes a plurality of tab pieces 2211 electrically connected to the current collector 211. The plurality of tab pieces 2211 converge near the current collector 211 to form a first gathering part 2212. The plurality of tab pieces 2211 converge and connect away from the current collector 211 to form a second gathering part 2213. The adapter piece 222 is electrically connected to the second gathering part 2213.

[0273] Figure 22 This is a cross-sectional view of a battery cell provided in some embodiments of this application, in conjunction with... Figure 21 and Figure 22 In the second embodiment, as an optional solution, taking the plane containing the cross-section of the mounting hole 113 as the projection plane Ω, at least a portion of the outer contour of the projection of the second gathering portion 2213 on the projection plane Ω is located within the range of the outer contour of the projection of the first welding surface 120 on the projection plane Ω along a direction perpendicular to the projection plane Ω; taking the plane containing the cross-section of the mounting hole 113 as the projection plane Ω, at least a portion of the outer contour of the projection of the first gathering portion 2212 on the projection plane Ω is located within the range of the outer contour of the projection of the first welding surface 120 on the projection plane Ω along a direction perpendicular to the projection plane Ω. Of course, in other embodiments, one of the second gathering portion 2213 and the first gathering portion 2212 satisfies the above-mentioned setting requirements, and this application embodiment does not limit this.

[0274] In the above technical solution, by setting at least a portion of the outer contour of the projection of the second gathering part 2213 on the projection plane Ω to be within the range of the outer contour of the projection of the first welding surface 120 on the projection plane Ω, and at least a portion of the outer contour of the projection of the first gathering part 2212 on the projection plane Ω to be within the range of the outer contour of the projection of the first welding surface 120 on the projection plane Ω, it is beneficial to save the space occupied by the first gathering part 2212 and the second gathering part 2213 in the axial direction of the vertical mounting hole 113, and to reduce the distance between the first pole post 12 and the cell assembly 2 in the axial direction of the mounting hole 113, so as to improve the energy density of the battery cell 10.

[0275] For example, in Figure 21 In the example, the first welding surface 120 is located on the side of the first electrode 12 facing the cell assembly 2; in Figure 22In the example, the first welding surface 120 is located on the side of the first electrode post 12 away from the cell assembly 2. At this time, a first through hole 12130 can be formed on the first electrode post 12 so that the conductive part 22 can pass through the first through hole 12130 to the side of the first electrode post 12 away from the cell assembly 2 to be welded to the first welding surface 120. At this time, the first welding surface 120 can include a first part 120a and a second part 120b, and the first part 120a and the second part 120b are respectively located on opposite sides of the first through hole 12130.

[0276] Combination Figure 21 In the second embodiment, as an optional solution, a second welding surface 220 is formed on a portion of the end face of the adapter piece 222 near the first pole post 12. Along the direction perpendicular to the projection plane Ω, the projected area of the second welding surface 220 on the projection plane Ω is greater than or equal to 1 / 12 of the projected area of the adapter piece 222 on the projection plane Ω, so that the adapter piece 222 can provide a sufficient welding area.

[0277] For example, the projected area of the second welding surface 220 on the projection surface Ω is 1 / 11, 1 / 10, 1 / 9, or 1 / 8 of the projected area of the adapter piece 222 on the projection surface Ω, etc.

[0278] Optionally, the adapter piece 222 is ultrasonically welded to the second gathering part 2213, and the adapter piece 222 is laser-welded to the first pole post 12.

[0279] In some embodiments of this application, Figure 23 This is a cross-sectional view of a battery cell provided in some embodiments of this application; Figure 24 This is a cross-sectional view of a battery cell provided in some embodiments of this application; Figure 25 for Figure 3 The above-projected view of the battery cell shown; Figure 26 for Figure 25 A cross-sectional view along line AA, as shown Figures 23 to 26 As shown, the first pole post 12 is provided with a receiving portion 121, and at least a portion of the conductive portion 22 is received in the receiving portion 121.

[0280] At least one of the multiple terminals of the battery cell 10 is a first terminal 12 with a receiving portion 121. The receiving portion 121 is a virtual structure with a receiving space, which can be a groove-shaped structure, a hole-shaped structure, or a composite structure of groove-shaped and hole-shaped structures. That is, all terminals on the housing 11 can be first terminals 12 with receiving portions 121, or only a portion of the terminals on the housing 11 can be first terminals 12 with receiving portions 121. When only a portion of the terminals on the housing 11 are first terminals 12 with receiving portions 121, the remaining terminals on the housing 11 are second terminals 15 without receiving portions 121. Figure 27 This is a schematic diagram of the structure of a battery cell 10 provided in some embodiments of this application; Figure 28 For some embodiments of this application, see the assembly diagram of the second pole post 12 without the receiving portion 121, the cell assembly 2, and the housing 11. Figure 27 and Figure 28 ).

[0281] Both the first terminal 12 and the second terminal 15 can be electrically connected to the active material coating portion 21 via the conductive portion 22, enabling the charging and discharging operation of the battery cell 10. Of course, in other embodiments of this application, the housing assembly 1 may have only one terminal, specifically the first terminal 12, which comprises two insulated parts that serve as the positive and negative terminals, respectively. For simplicity, the following description will primarily focus on the example where all terminals on the housing 11 are first terminals 12 with receiving portions 121.

[0282] In the above technical solutions, please refer to Figure 25 and Figure 26 At least a portion of the guide portion 22 is accommodated within the corresponding receiving portion 121. "At least a portion" means that the conductive portion 22 can be entirely accommodated within the receiving portion 121, or only a portion of the conductive portion 22 can be accommodated within the receiving portion 121. Because the first electrode post 12 is provided with the receiving portion 121, the hollow structure of the receiving portion 121 can reduce the weight of the electrode post 12 to a certain extent, thereby increasing the gravimetric energy density of the battery cell 10 and the battery 100.

[0283] Furthermore, by partially or entirely accommodating the conductive portion 22 within the receiving portion 121, the portion of the conductive portion 22 located within the receiving portion 121 can occupy space within the first electrode post 12. This reduces the space occupied by the conductive portion 22 within the housing 11. When the size of the housing 11 is fixed, some space can be saved within the housing 11 to accommodate a larger active material coating portion 21, thereby increasing the volumetric energy density of the battery cell 10. For example, when the conductive portion 22 is led out from the side of the active material coating portion 21 closest to the first electrode post 12, the space occupied by the conductive portion 22 between the active material coating portion 21 and the first electrode post 12 can be saved. This allows for an increase in the size of the active material coating portion 21 in the direction of conductive portion 22 lead-out, reducing the distance between the active material coating portion 21 and the first electrode post 12, thereby increasing the energy density of the battery cell 10.

[0284] Furthermore, by accommodating at least a portion of the conductive part 22 within the receiving portion 121, the space occupied by the battery cell 10 itself can be reduced, allowing a larger number of battery cells 10 to be accommodated in a battery 100 of the same volume, thereby increasing the volumetric energy density of the battery 100. Additionally, accommodating at least a portion of the conductive part 22 within the receiving portion 121 reduces the space occupied by the first electrode post 12, thereby reducing the redundancy of the conductive part 22 within the casing 11 to a certain extent, decreasing the probability of short circuits between the conductive part 22 and the active material coating portion 21, reducing the probability of short circuits in the battery cell 10, and improving the operational reliability and stability of the battery cell 10 and the battery 100. Moreover, accommodating at least a portion of the conductive part 22 within the receiving portion 121 also helps to secure and limit the conductive part 22, improving its stability and facilitating welding of the conductive part 22 to the first electrode post 12, thereby improving assembly efficiency and ultimately enhancing the reliability of the battery cell 10.

[0285] In some optional embodiments of this application, please refer again to Figure 3 , Figure 25 and Figure 26 Each of the multiple poles on the housing assembly 1 is a first pole 12 with a receiving portion 121. This allows more conductive portions 22 to be housed within all the first poles 12, thereby improving the volumetric energy density of the battery cell 10.

[0286] In some other optional embodiments of this application, please refer to Figure 27 and Figure 28 At least one of the multiple terminals on the housing assembly 1 is a first terminal 12 with a receiving portion 121 and at least one is a second terminal 15 without a receiving portion 121, so that the first terminal 12 and the second terminal 15 can be flexibly selected and matched according to actual needs such as energy density and cost, so as to improve the applicability of the battery cell 10.

[0287] It should be noted that, please refer to Figure 27 and Figure 28 When a second pole post 15 is provided on the housing 11, a clearance groove 18 is defined between the second pole post 15 and the housing 11, and at least a portion of the conductive part 22 is housed in the clearance groove 18. This can reduce the space occupied by the conductive part 22 within the housing 11 to a certain extent, which is beneficial to improving energy density and improving problems such as short circuits caused by the redundancy of the conductive part 22.

[0288] In some embodiments of this application, the receiving portion 121 can be located either on the side of the first electrode post 12 facing the active material coating portion 21, or on the side of the first electrode post 12 away from the active material coating portion 21. For example, Figure 29 For partial cross-sectional schematic diagrams of battery cells provided in some embodiments of this application, please refer to the following: Figure 8 and Figure 29 When the receiving portion 121 is located on the side of the first electrode post 12 facing the active material coating portion 21, the receiving portion 121 includes a first receiving groove 12110, the surface of the first electrode post 12 facing the active material coating portion 21 is the inner end face 122 of the electrode post, the groove opening of the first receiving groove 12110 is formed on the inner end face 122 of the electrode post, and at least a portion of the conductive portion 22 is received in the first receiving groove 12110.

[0289] For example, the first receiving groove 12110 is a groove body, which is a groove-shaped structure with a certain depth. For instance, when the first pole post 12 is disposed on the upper end wall of the housing 11, and the inner end face 122 of the pole post is the lower surface of the first pole post 12, the first receiving groove 12110 is formed as a receiving groove with the opening facing downward and the groove wall recessed upward. As another example, when the first pole post 12 is disposed on the lower end wall of the housing 11, and the inner end face 122 of the pole post is the upper surface of the first pole post 12, the first receiving groove 12110 is formed as a receiving groove with the opening facing upward and the groove wall recessed downward.

[0290] In the above technical solution, on the one hand, opening a first receiving groove 12110 on the first electrode post 12 can reduce the weight of the first electrode post 12 to a certain extent, thereby increasing the weight energy density of the battery cell 10 and the battery 100; on the other hand, since the opening of the first receiving groove 12110 is formed on the inner end face 122 of the electrode post, and the inner end face 122 of the electrode post is the surface of the first electrode post 12 near the active material coating part 21, the first receiving groove 12110 can be opened towards the active material coating part 21, thereby facilitating the insertion of the conductive part 22 into the first receiving groove 12110 and improving assembly efficiency. Moreover, this type of first receiving groove 12110 is easy to process and improves production efficiency.

[0291] Furthermore, the first receiving tank 12110 is easy to process into a larger volume, thereby accommodating more conductive parts 22. At the same time, since the first receiving tank 12110 is open towards the active material coating part 21, it can also serve as a buffer and temporary storage structure for the electrolyte, allowing the casing 11 to hold more electrolyte. Since the battery cell 10 loses electrolyte during charging and discharging, more electrolyte can extend the service life of the battery cell 10. Also, because the first receiving tank 12110 is open towards the active material coating part 21, it can also serve as a receiving and buffering structure for gas generated inside the cell assembly 2, reducing the expansion of the battery cell 10 and improving the reliability and stability of the battery cell 10.

[0292] Furthermore, since the first receiving groove 12110 is located inside the first electrode post 12, external foreign matter and impurities are less likely to enter the first receiving groove 12110, thereby reducing the impact of external foreign matter and impurities on the cell assembly 2, improving the stability and reliability of the cell assembly 2, and thus improving the stability and reliability of the battery cell 10 and the battery 100. At the same time, the first receiving groove 12110 can be set at the position corresponding to the mounting hole 113, or in other words, on the projection plane perpendicular to the axial direction R of the first electrode post 12, the orthographic projection of the first receiving groove 12110 is located within the orthographic projection range of the mounting hole 113, so that the first receiving groove 12110 can have a larger depth to accommodate more conductive parts 22, thereby further reducing the space occupied by the conductive parts 22 in the housing 11.

[0293] Please refer to Figure 28 and Figure 29 In the embodiments of this application, the connection method between the first pole 12 and the housing 11 is not limited. For example, it can be welding or riveting. For instance, when the two are joined by riveting, the housing 11 has a mounting hole 113, and the first pole 12 is riveted and installed in the mounting hole 113. Of course, it is understood that when the two are joined by welding or other methods, the housing 11 may also have a mounting hole 113, and the first pole 12 is installed in the mounting hole 113.

[0294] Specifically, when the housing 11 has a mounting hole 113 and the first pole post 12 is installed in the mounting hole 113, along the axial direction R of the first pole post 12, the depth H1 of the first receiving groove 12110 is greater than or equal to the minimum distance H2 from the inner end face 122 of the pole post to the mounting hole 113.

[0295] It should be noted that the specific shape of the first receiving groove 12110 is not limited. It can be a regular shape or an irregular shape, such as a cylindrical groove with a rectangular, elliptical, or racetrack-shaped cross-section (a structure formed by two arcs and two straight lines), a trapezoidal groove with a rectangular cross-section and gradually changing cross-sectional dimensions, a hemispherical groove with a circular cross-section and gradually changing cross-sectional dimensions, or a semi-ellipsoidal groove with an elliptical cross-section and gradually changing cross-sectional dimensions, etc. Therefore, the depth H1 of the first receiving groove 12110 refers to the maximum depth of the first receiving groove 12110 along the axial direction R of the first pole post 12.

[0296] Since the depth H1 of the first receiving groove 12110 along the axial direction R of the first electrode post 12 is greater than or equal to the minimum distance H2 from the inner end face 122 of the electrode post to the mounting hole 113, the volume of the first electrode post 12 can be fully utilized, resulting in a larger depth of the first receiving groove 12110. This facilitates the accommodating of more conductive parts 22, thereby reducing the space occupied by the conductive parts 22 within the housing 11 and further improving the energy density of the battery cell 10. It also further reduces the redundancy of the conductive parts 22 within the housing 11. At the same time, the larger depth of the first receiving groove 12110 can also accommodate the gas generated by the cell assembly 2, ensuring the reliability and stability of the battery cell 10. It can also accommodate more electrolyte to ensure the service life of the battery cell 10.

[0297] It should also be noted that the volume of the first receiving groove 12110 is not limited. For example, in some specific examples, the volume of the first receiving groove 12110 used to accommodate the conductive part 22 (denoted as the first volume V1) can be greater than or equal to 298 mm. 2 This allows the first receiving groove 12110 to have sufficient space to accommodate the conductive part 22, and facilitates the welding of the conductive part 22 to the first electrode post 12. However, when the first volume V1 of the first receiving groove 12110 is less than 298 mm²... 3 At this time, the capacity of the first receiving groove 12110 to accommodate the conductive part 22 is relatively weakened, and the welding difficulty between the conductive part 22 and the first pole post 12 is increased.

[0298] Furthermore, it is worth noting that the first volume V1 of the first receiving groove 12110 is the difference between the total volume V2 of the first receiving groove 12110 and the volume of the first receiving groove 12110 needed to accommodate components other than the conductive part 22 (denoted as the second volume V3), i.e., V1 = V2 - V3. It can be understood that when the first receiving groove 12110 does not need to accommodate components other than the conductive part 22, the second volume V3 can be 0 mm. 3 For example, the first volume V1 of the first receiving groove 12110 can be 300 mm. 3 -1500mm 3 For example, 300mm 3 400mm 3 500mm 3 600mm 3 700mm 3 800mm 3 1000mm 3 1200mm 3 1400mm 3 1500mm 3 etc.

[0299] Please refer to this again. Figure 8 and Figure 29 To ensure the stability and reliability of the electrical connection between the active material coating part 21 and the first electrode post 12, in embodiments of this application, the electrical connection position between the conductive part 22 and the first electrode post 12 can be located on the wall of the first receiving groove 12110. In this case, the wall of the first receiving groove 12110 forms a first welding surface 120, and the surface of the conductive part 22 opposite to the first welding surface 120 forms a second welding surface 220. Exemplarily, the conductive part 22 and the first electrode post 12 can be electrically connected by welding, with the connection position being the welding position of the conductive part 22 and the first electrode post 12. Furthermore, the welding method between the conductive part 22 and the first electrode post 12 is not limited; for example, it can be laser welding. Depending on the position, angle, or structure of the welding area, vertical welding, inclined welding, lap welding, or edge sealing welding can be selected. In other embodiments of this application, the conductive part 22 and the first electrode post 12 can also be electrically connected by other methods instead of welding, such as using conductive adhesive or conductive nails. To simplify the description, the following text will use the example of the conductive part 22 being welded to the first pole post 12 to form an electrical connection, with the welding position being the electrical connection position between the conductive part 22 and the first pole post 12.

[0300] Specifically, the first electrode post 12 includes a first end wall 12111 and a first side wall 12113. The first end wall 12111 is located on the side of the first side wall 12113 away from the active material coating portion 21. The first end wall 12111 and the first side wall 12113 form a first receiving groove 12110. The electrical connection position between the conductive portion 22 and the first electrode post 12 is located at the first end wall 12111 and / or the first side wall 12113. That is, the conductive portion 22 can be welded to at least one of the first end wall 12111 and the first side wall 12113. In this case, the wall surface of the first end wall 12111 and / or the first side wall 12113 forms a first welding surface 120, and the surface of the conductive portion 22 opposite to the first welding surface 120 forms a second welding surface 220.

[0301] In the above technical solution, by setting the electrical connection position between the conductive part 22 and the first electrode post 12 on at least one of the first end wall 12111 and the first side wall 12113, the first receiving groove 12110 not only serves to accommodate at least a portion of the conductive part 22, but the groove wall of the first receiving groove 12110 also serves to achieve electrical connection with the conductive part 22. This simplifies the structure of the first electrode post 12, facilitates its processing, and simplifies the structure of the conductive part 22, reducing redundancy and lowering its cost. Furthermore, by utilizing the groove wall of the first receiving groove 12110 to achieve electrical connection with the conductive part 22, the area where the conductive part 22 is electrically connected to the first electrode post 12 can be set relatively large. This not only reduces the difficulty of electrical connection but also improves the reliability and stability of the electrical connection, thereby enhancing the performance of the battery cell 10.

[0302] Furthermore, since the electrical connection between the conductive part 22 and the first pole post 12 is located within the first receiving groove 12110, it not only prevents the electrical connection from protruding outside the first pole post 12 and occupying space outside the first pole post 12, but also allows the electrical connection to be protected by the first pole post 12, thereby improving the reliability and stability of the electrical connection between the conductive part 22 and the first pole post 12.

[0303] In addition, in the embodiments of this application, the first end wall 12111 is constructed as a closed structure without perforations, so as to isolate the first receiving groove 12110 from the external space of the housing 11, thereby avoiding the problem of electrolyte leakage from the first receiving groove 12110 inside the housing 11.

[0304] Please refer to this again. Figure 8 and Figure 29 In the embodiments of this application, a partial shape of the conductive portion 22 matches a partial shape of the first end wall 12111, and they are fitted together to achieve an electrical connection, such that the position where the conductive portion 22 is electrically connected to the first end wall 12111 extends along the length or width direction of the first end wall 12111. For example, when the first end wall 12111 is planar, a portion of the conductive portion 22 can also be planar and fitted to the first end wall 12111, and an electrical connection, such as welding, is performed at the fitted position. This increases the area of the electrical connection and improves the reliability and stability of the electrical connection.

[0305] In addition, when the electrical connection between the conductive part 22 and the first end wall 12111 is welding, since the first end wall 12111 is located on the side of the first receiving groove 12110 away from the active material coating part 21, welding operation is convenient. For example, welding can be performed from the side of the first pole post 12 away from the active material coating part 21.

[0306] It is worth noting that the shape of the first end wall 12111 is not limited, for example, it can be a flat plate, an arc-shaped plate, etc. Among them, when the first end wall 12111 is a flat plate structure, the first end wall 12111 is arranged at an angle to the axial direction R of the first pole post 12. For example, it can be a flat plate structure perpendicular to the axial direction R of the first pole post 12, or it can be an inclined plate structure that is not perpendicular to the axial direction R of the first pole post 12, but the inclination direction is not limited.

[0307] Of course, in other embodiments of this application, the position where the conductive part 22 is electrically connected to the first end wall 12111 may not extend along the length or width direction of the first end wall 12111. For example, it may be a plurality of discretely arranged points. For example, the conductive part 22 has a plurality of spaced-apart portions that are welded to the first end wall 12111 respectively, which will not be elaborated here.

[0308] Figure 21 For a partial cross-sectional view of the battery cell 10 provided in some embodiments of this application, please refer to... Figure 21 In the embodiments of this application, when the conductive part 22 is electrically connected to the first end wall 12111, a first sinking groove 12112 can be provided on the wall of the first receiving groove 12110. The sinking direction of the first sinking groove 12112 is away from the direction of the active material coating part 21. At least part of the position where the guide part 22 is electrically connected to the first electrode post 12 is located in the first sinking groove 12112. At this time, the bottom of the first sinking groove 12112, that is, the wall surface of the first sinking groove 12112 away from the active material coating part 21, forms a first welding surface 120, and the surface of the conductive part 22 opposite to the first welding surface 120 forms a second welding surface 220.

[0309] For example, the first receiving groove 12110 has a first end wall 12111 and a first side wall 12113. A first recess 12112 is provided on the first end wall 12111. At least a portion of the conductive part 22 that is electrically connected to the first end wall 12111 is located in the first recess 12112. In this case, at least a portion of the conductive part 22 can be disposed in the first recess 12112 and connected to the portion of the first end wall 12111 of the first receiving groove 12110 used to define the first recess 12112.

[0310] In the above technical solution, on the one hand, the first sink 12112 can be used to pre-position and limit the electrical connection position of the conductive part 22, which is not only conducive to accurately finding the position to realize the electrical connection and improving production efficiency, but also conducive to improving the stability and reliability of the conductive part 22 and ensuring the stability and reliability of the charging and discharging process of the battery cell 10; on the other hand, by setting the first sink 12112 on the first end wall 12111, the local wall thickness of the first end wall 12111 can be locally reduced, which is not only conducive to welding, but also conducive to reducing the weight of the first electrode post 12 and increasing the weight energy density of the battery cell 10.

[0311] In some alternative embodiments, a portion of the conductive portion 22 is shaped and fitted to the first sidewall 12113. For example, when the first sidewall 12113 is curved, a portion of the conductive portion 22 can also be curved and fitted to the first sidewall 12113, and an electrical connection (e.g., welding) can be made at the fitted position so that the position where the conductive portion 22 is electrically connected to the first sidewall 12113 extends along the first sidewall 12113. This increases the area of the electrical connection, thereby improving the reliability and stability of the electrical connection.

[0312] Of course, in other embodiments of this application, the position where the conductive part 22 is electrically connected to the first sidewall 12113 may not extend along the first sidewall 12113. For example, it may be a plurality of discretely arranged points. For example, the conductive part 22 has a plurality of spaced portions that are welded to the first sidewall 12113 respectively. This will not be elaborated here.

[0313] It should be noted that the number of first sidewalls 12113 is not limited and can be determined according to the shape of the first receiving groove 12110, ensuring that the end of each first sidewall 12113 away from the opening of the first receiving groove 12110 is connected to the first end wall 12111. For example, when the cross-sectional shape of the first receiving groove 12110 is circular or elliptical, the first end wall 12111 is circular or elliptical, and the number of first sidewalls 12113 is one, arranged in a ring around the circumferential edge of the first end wall 12111. As another example, when the cross-sectional shape of the first receiving groove 12110 is rectangular or racetrack-shaped, the first end wall 12111 is rectangular or racetrack-shaped, and the number of first sidewalls 12113 is four, each connected to one of the four sides of the first end wall 12111.

[0314] It should also be noted that the first receiving groove 12110 is not limited to the form defined by the first end wall 12111 and the first side wall 12113. For example, in some embodiments, the first end wall 12111 may not exist. In this case, the ends of each first side wall 12113 that are away from the opening of the first receiving groove 12110 converge together, so that the first receiving groove 12110 is defined only by multiple first side walls 12113. In this case, the conductive part 22 can be electrically connected to the first side wall 12113 to ensure that the charging and discharging process of the battery cell 10 can proceed normally.

[0315] Furthermore, it is worth noting that in other embodiments of this application, the electrical connection between the conductive part 22 and the first electrode post 12 may not be located within the first receiving groove 12110. For example, the electrical connection between the conductive part 22 and the first electrode post 12 may also be located on the inner end face 122 of the electrode post. In this case, part of the conductive part 22 is accommodated within the first receiving groove 12110, which can also save space to a certain extent and improve the energy density of the battery cell 10.

[0316] In the embodiments of this application, please refer to Figure 21 The first electrode post 12 can also be provided with a first groove 126 as needed. The first groove 126 is located on the side of the first electrode post 12 away from the active material coating part 21. That is, the surface of the first electrode post 12 away from the active material coating part 21 is the outer end face 123 of the electrode post, and the groove opening of the first groove 126 is formed on the outer end face 123 of the electrode post.

[0317] It is understood that the first groove 126 is a groove body, which is a groove-shaped structure with a certain depth. Furthermore, when the first electrode post 12 is disposed on the upper end wall of the housing 11, and the outer end face 123 of the electrode post is the upper surface of the first electrode post 12, the first groove 126 is formed as a groove with its opening facing upwards and its wall recessed downwards (i.e., recessed towards the direction of the battery cell assembly 2). For example, when the first electrode post 12 is disposed on the lower end wall of the housing 11, and the outer end face 123 of the electrode post is the lower surface of the first electrode post 12, the first groove 126 is formed as a groove with its opening facing downwards and its wall recessed upwards (i.e., recessed towards the direction of the battery cell assembly 2).

[0318] In the above technical solution, on the one hand, since the first pole post 12 is provided with the first groove 126, the weight of the first pole post 12 can be further reduced, so as to improve the weight energy density of the battery cell 10 and the battery 100; on the other hand, the first groove 126 is located on the outside of the first pole post 12, that is, it is open on the side of the first pole post 12 facing away from the inside of the housing 11. The first groove 126 can be used to accommodate or install the structural components that electrically connect each battery cell 10 in the battery 100, so as to make full use of the space inside the first pole post 12 and improve the space utilization and volume energy density of the battery 100.

[0319] Furthermore, since the first electrode post 12 simultaneously has a first receiving groove 12110 and a first recess 126, and the first recess 126 is located on the side of the first receiving groove 12110 away from the active material coating portion 21, and the first recess 126 opens in the direction away from the first receiving groove 12110, it is convenient to perform laser welding of the conductive portion 22 to the first end wall 12111 from the outside of the first electrode post 12, that is, the side of the first electrode post 12 away from the active material coating portion 21, through the first recess 126. In other words, it is convenient to achieve electrical connection between the conductive portion 22 and the first electrode post 12 through external welding. That is to say, with the above structural arrangement, it is convenient to perform external welding of the first electrode post 12 and the conductive portion 22 through the first recess 126, which facilitates the processing and manufacturing of the battery cell 10 and can save processing and manufacturing costs.

[0320] Furthermore, in order to facilitate and effectively weld the conductive part 22 to the wall of the first receiving groove 12110 via the first groove 126, and to improve the welding reliability of the conductive part 22 to the wall of the first receiving groove 12110, in the embodiments of this application, the portion between the first groove 126 and the first receiving groove 12110 can be laser welded to the conductive part 22, that is... Figure 21 The spacer portion 127 shown is laser-welded to the conductive portion 22 to achieve electrical connection between the battery cell assembly 2 and the first terminal post 12. The spacer portion 127 of the first terminal post 12, located between the first groove 126 and the first receiving groove 12110, is relatively thin. The spacer portion 127 isolates the first groove 126 and the first receiving groove 12110. The side wall of the spacer portion 127 near the active material coating portion 21 can serve as the first end wall 12111. When the conductive portion 22 needs to be welded to the first end wall 12111, the relatively thin thickness of the spacer portion 127 facilitates the welding of the conductive portion 22 and the first end wall 12111 through the first groove 126, improving the convenience and reliability of the welding.

[0321] In some embodiments, the first receiving groove 12110 can be configured with a cross-sectional shape whose length is greater than its width, such as rectangular, elliptical, racetrack-shaped, etc. The weld mark formed by welding the conductive part 22 and the first electrode post 12 can be an elongated weld mark parallel to the length direction of the first receiving groove 12110 to improve welding reliability and increase current carrying capacity. For example, when the weld mark formed by welding the conductive part 22 and the first end wall 12111 is an elongated weld mark, the width of the weld mark can be greater than or equal to 6 mm, and the distance between the weld mark and the first side wall 12113 can be greater than or equal to 1 mm, so as to ensure the current carrying capacity of the battery cell 10 while ensuring welding convenience and reliability.

[0322] Please refer to this again. Figure 8Furthermore, the battery cell 10 may also include a slot cover 7, which is disposed on the first pole post 12 and covers the slot opening of the first groove 126.

[0323] In the above technical solution, by providing a groove cover 7 to seal the first groove 126, the first electrode post 12 can be indirectly electrically connected to the busbar component through the groove cover 7. By setting the position and structure of the groove cover 7, the electrical connection between the groove cover 7 and the busbar component is more convenient and the electrical connection area is larger. Therefore, by providing the groove cover 7, the electrical connection between adjacent battery cells 10 within the battery 100 can be facilitated. Furthermore, since the electrical connection between battery cells 10 is located at the groove cover 7, the electrical connection between the battery cells 10 and the conductive part 22 and the first electrode post 12 can be separated by the first groove 126, resulting in less interference between them and further improving the stability and reliability of the battery cells 10.

[0324] It should be noted that, based on the arrangement of the receiving portion 121 including the first receiving groove 12110, the specific configuration of the battery cell assembly 2 in this application embodiment is not limited, and may include, but is not limited to, the following two implementation methods.

[0325] Figure 30 For a partial cross-sectional view of the battery cell assembly 2 provided in some embodiments of this application, please refer to... Figure 8 , Figure 21 and Figure 30 In a first embodiment, the active material coating portion 21 includes a current collector 211 and an active material layer 212 disposed on the current collector 211. The conductive portion 22 includes a tab portion 221 electrically connected to the current collector 211. The tab portion 221 includes a plurality of tab pieces 2211. The tab pieces 2211 are electrically connected to the current collector 211 but are not coated with active material. They can be formed by direct die-cutting from the current collector 211. The plurality of tab pieces 2211 converge near the current collector 211 (i.e., converge toward each other) to form a first convergence portion 2212. The plurality of tab pieces 2211 converge away from the current collector 211 and connect to form a second convergence portion 2213. The first convergence portion 2212 connects the second convergence portion 2213 and the active material coating portion 21. When the receiving portion 121 has a first receiving groove 12110, at least a portion of the second convergence portion 2213 can be received within the first receiving groove 12110.

[0326] In the above technical solution, when the multiple tabs 2211 form the first gathering portion 2212, they only converge (i.e., gather towards each other) but are not connected. However, when the multiple tabs 2211 form the second gathering portion 2213, they not only converge but are also connected into an integral structure. For example, the multiple tabs 2211 can be connected into an integral plate structure by welding (e.g., ultrasonic welding) to form the second gathering portion 2213. Alternatively, the multiple tabs 2211 can be converged and connected to form the second gathering portion 2213 by means of conductive adhesive bonding, etc., which will not be elaborated here.

[0327] It should be noted that, in the embodiments of this application, the tabs 2211 are divided into positive electrode tabs 2211 and negative electrode tabs 2211. The positive electrode tabs 2211 that need to be gathered together are stacked together and ultrasonically pre-welded to form the second gathered portion 2213 of the positive electrode. This reduces the interlayer gaps, allowing the loosely packed multiple positive electrode tabs 2211 to form a plate structure with a certain rigidity. Similarly, the negative electrode tabs 2211 that need to be gathered together are stacked together and ultrasonically pre-welded to form the second gathered portion 2213 of the negative electrode. This also reduces the interlayer gaps, allowing the loosely packed multiple negative electrode tabs 2211 to form a plate structure with a certain rigidity.

[0328] In the above technical solution, the phrase "multiple tabs 2211 converge near the current collector 211 to form a first gathering portion 2212, and multiple tabs 2211 converge and connect away from the current collector 211 to form a second gathering portion 2213" aims to illustrate that: along the extending direction of the tabs 2211, the first gathering portion 2212 and the second gathering portion 2213 are arranged sequentially in the direction away from the current collector 211, and the specific positions of the first gathering portion 2212 and the second gathering portion 2213 are not limited; that is, it is not required that the first gathering portion 2212 be very close to the current collector 211, nor is it required that the second gathering portion 2213 be very far from the current collector 211. In some optional examples, the current collector 211 and the tabs 2211 can be a single piece; for example, for the positive electrode, it can be an integrally formed aluminum foil, and for the negative electrode, it can be an integrally formed copper foil, etc.

[0329] In the above technical solution, since the tab portion 221 includes a second gathering portion 2213 formed by the convergence and connection of multiple tab pieces 2211, at least a portion of the second gathering portion 2213 is accommodated in the first receiving groove 12110, which facilitates the connection between the conductive portion 22 and the first electrode post 12, and can make full use of the space of the first electrode post 12, thereby improving the volumetric energy density of the battery cell 10. At this time, the surface of the second gathering portion 2213 opposite to the first welding surface 120 forms the second welding surface 220.

[0330] Please refer to Figure 8, Figure 21 and Figure 30 In the first embodiment, at least a portion of the first gathering portion 2212 is accommodated within the first receiving groove 12110. In the above technical solution, at least a portion of the first gathering portion 2212 and at least a portion of the second gathering portion 2213 of the tab portion 221 are both accommodated within the first receiving groove 12110, thereby making fuller use of the space within the first electrode post 12, further reducing the space occupied by the tab portion 221 within the housing 11, so as to accommodate a larger active material coating portion 21, improve the volumetric energy density of the battery cell 10, and further reduce the redundancy of the tab portion 221 within the housing 11, thereby reducing the probability of short circuit between the tab portion 221 and the active material coating portion 21.

[0331] In this embodiment, the second retractable portion 2213 is directly or indirectly electrically connected to the first pole post 12. For example, please refer to... Figure 8 When the second gathering portion 2213 is directly electrically connected to the first electrode post 12, such as when the second gathering portion 2213 is welded (e.g., laser welded) to the first electrode post 12, the structure of the battery cell assembly 2 can be simplified, the number of parts reduced, the assembly process simplified, and the assembly efficiency improved. The method and location of the direct electrical connection between the second gathering portion 2213 and the first electrode post 12 are not limited. For example, the electrical connection position between the second gathering portion 2213 and the first electrode post 12 can be located at the first end wall 12111 and / or the first side wall 12113. Further, the electrical connection position between the second gathering portion 2213 and the first end wall 12111 can extend along the length or width direction of the first end wall 12111. Even further, the first end wall 12111 has a first recessed groove 12112, and the electrical connection position between the second gathering portion 2213 and the first end wall 12111 can be located within the first recessed groove 12112, etc. The corresponding technical effects can be referred to the description of the above embodiments, and will not be repeated here.

[0332] As an optional solution, the conductive part 22 can also be equipped with an adapter piece 222 as needed, in which case the second retractable part 2213 is electrically connected to the first pole post 12. For details, please refer to... Figure 21 When the conductive part 22 includes the adapter piece 222, the adapter piece 222 is connected to the second gathering part 2213, and the conductive part 22 is electrically connected to the first pole post 12 through the adapter piece 222. At this time, at least a portion of the adapter piece 222 is accommodated in the first receiving groove 12110. In this example, at least a portion of the second gathering part 2213 is also accommodated in the first receiving groove 12110, but the first gathering part 2212 may or may not be accommodated in the first receiving groove 12110.

[0333] In the above technical solution, the active material coating part 21 can be electrically connected to the first electrode post 12 through the first gathering part 2212, the second gathering part 2213, and the adapter piece 222 in sequence. The conductive part 22 is electrically connected to the first electrode post 12 at the position on the adapter piece 222. For example, the electrical connection can be achieved by welding the adapter piece 222 to the first electrode post 12 (e.g., laser welding). In addition, the adapter piece 222 and the tab piece 2211 are two separate components and are connected by welding (e.g., ultrasonic welding).

[0334] In the above technical solution, on the one hand, by accommodating at least a portion of the second gathering portion 2213 and at least a portion of the adapter piece 222 within the first receiving groove 12110, the space within the first electrode post 12 can be utilized more fully, further reducing the space occupied by the conductive portion 22 within the housing 11, thereby increasing the volumetric energy density of the battery cell 10. Furthermore, when at least a portion of the first gathering portion 2212, at least a portion of the second gathering portion 2213, and at least a portion of the adapter piece 222 are all accommodated within the first receiving groove 12110, the space within the first electrode post 12 can be utilized more fully, more effectively reducing the space occupied by the conductive portion 22 within the housing 11, thereby further increasing the volumetric energy density of the battery cell 10.

[0335] On the other hand, by using the adapter piece 222 to achieve the indirect electrical connection between the second gathering part 2213 and the first terminal 12, the adapter piece 222 can be welded to the first terminal 12 by avoiding the part of the second gathering part 2213, thereby making the welding between the adapter piece 222 and the first terminal 12 more reliable, reducing the risk of welding cracking, and further improving the reliability and stability of the battery cell 10; at the same time, by electrically connecting the first terminal 12 and the tab 2211 through the adapter piece 222, the structure of the tab 2211 can also be simplified.

[0336] The method and location of the direct electrical connection between the adapter piece 222 and the first pole piece 12 are not limited. For example, the adapter piece 222 and the first pole piece 12 can be electrically connected by welding. For example, the electrical connection position between the adapter piece 222 and the first pole piece 12 can be located at the first end wall 12111 and / or the first side wall 12113. Further, the electrical connection position between the adapter piece 222 and the first end wall 12111 can extend along the length or width direction of the first end wall 12111. Further still, the first end wall 12111 has a first recessed groove 12112, and the electrical connection position between the adapter piece 222 and the first end wall 12111 can be located within the first recessed groove 12112, etc. The corresponding technical effects can be referred to the description of the above embodiments, and will not be repeated here. When the electrical connection position between the adapter piece 222 and the first pole post 12 is located at the first end wall 12111 and / or the first side wall 12113, since at least a portion of the adapter piece 222 is accommodated in the first receiving groove 12110, the structure of the adapter piece 222 can be simplified, redundancy can be reduced, and costs can be lowered.

[0337] Please refer to Figure 21 and Figure 30 In the second embodiment, the active material coating portion 21 includes a current collector 211 and an active material layer 212 disposed on the current collector 211. The conductive portion 22 includes a tab portion 221 and an adapter piece 222. The tab portion 221 includes a plurality of tab pieces 2211 electrically connected to the current collector 211. The plurality of tab pieces 2211 converge near the current collector 211 to form a first gathering portion 2212, and the plurality of tab pieces 2211 converge and connect away from the current collector 211 to form a second gathering portion 2213. The adapter piece 222 is electrically connected to the second gathering portion 2213. When the receiving portion 121 has a first receiving groove 12110, at least a portion of the adapter piece 222 can be received in the first receiving groove 12110 and electrically connected to the first electrode post 12.

[0338] In the above technical solution, compared with the solution including the adapter piece 222 in the first embodiment, in the second embodiment, at least a portion of the adapter piece 222 is accommodated in the first receiving groove 12110, but the relative position of the electrode tab 221 and the first receiving groove 12110 is not limited. That is, at least a portion of the electrode tab 221 can be accommodated in the first receiving groove 12110, or the electrode tab 221 can be completely located outside the first receiving groove 12110, thereby satisfying different structural design requirements. At this time, the surface of the adapter piece 222 opposite to the first welding surface 120 forms the second welding surface 220.

[0339] In the above technical solution, by accommodating at least a portion of the adapter piece 222 in the first receiving groove 12110, the adapter piece 222 can occupy the space inside the first terminal post 12, thereby reducing the space occupied by the adapter piece 222 in the housing 11 to accommodate a larger active material coating part 21, increasing the volumetric energy density of the battery cell 10, and reducing the probability of short circuit between the adapter piece 222 and the active material coating part 21, reducing the risk of short circuit in the cell assembly 2, thereby improving the stability and reliability of the battery cell 10.

[0340] Furthermore, by using an adapter piece 222 to achieve an indirect electrical connection between the second gathering portion 2213 and the first terminal post 12, the adapter piece 222 can be welded to the first terminal post 12 using a portion that avoids the second gathering portion 2213, thereby making the weld between the adapter piece 222 and the first terminal post 12 more secure, reducing the risk of weld cracking, and further improving the reliability and stability of the battery cell 10; at the same time, by electrically connecting the first terminal post 12 and the tab 2211 through the adapter piece 222, the structure of the tab 2211 can also be simplified.

[0341] For example, in some optional embodiments, such as Embodiment 1 above or the third embodiment below, when the second gathering portion 2213 is directly electrically connected to the first pole post 12, the conductive portion 22 may consist only of the positive and negative electrodes in each electrode assembly 2a. For example, in other embodiments, such as Embodiment 1 or Embodiment 2 above, or the third or fourth embodiment below, when the second gathering portion 2213 is indirectly electrically connected to the first pole post 12 through the adapter piece 222, the conductive portion 22 may simultaneously consist of the positive and negative electrodes in each electrode assembly 2a and each adapter piece 222.

[0342] Figure 31 For various tab-gathering schemes of the battery cell assembly provided in some embodiments of this application, please refer to the following diagrams. Figure 30 and Figure 31 In some embodiments, when the cell assembly 2 includes two electrode assemblies 2a, the tabs 2211 of the two electrode assemblies 2a can be folded together, and the folded position is located at the center between the two electrode assemblies 2a, to form a symmetrical folded shape (e.g., Figure 30 and Figure 31 (a) shown). Alternatively, in some other embodiments, when the tabs 2211 of the two electrode assemblies 2a are brought together, the brought-up position can also be biased towards one of the electrode assemblies 2a to form an asymmetrical brought-up form (e.g., Figure 31 (b) and Figure 31 (c) shown). Furthermore, electrode assembly 2a can be in the form of a full-out tab (e.g., Figure 31 (a) shown), or it can be in the form of a semi-ejector lug (e.g., as shown in (a)). Figure 30, Figure 31 (b) and Figure 31 (c) is shown.

[0343] Of course, the tabs 2211 of the same polarity of the two electrode components 2a may not be folded together. For example, the tabs 2211 of each electrode component 2a may be folded together separately according to the positive and negative poles, that is, the positive tab of one electrode component 2a is folded together separately, and the positive tab of the other electrode component 2a is also folded together separately, which will not be elaborated here.

[0344] It should be noted that the receiving portion 121 in the embodiments of this application is not limited to having the form of a first receiving groove 12110. For example, some other optional embodiments will be given later.

[0345] For example, Figure 32 For a partial cross-sectional view of a battery cell provided in some embodiments of this application, please refer to... Figure 32 In embodiments of this application, the receiving portion 121 may also be configured to include a second receiving groove 12120. The surface of the first electrode post 12 away from the active material coating portion 21 is the outer end face 123 of the electrode post. The groove opening of the second receiving groove 12120 is formed on the outer end face 123 of the electrode post. The second receiving groove 12120 communicates with the interior of the housing 11 through a first through hole 12130. The conductive portion 22 passes through the first through hole 12130 and is at least partially received in the second receiving groove 12120. In this case, the groove wall surface of the second receiving groove 12120 forms a first welding surface 120, and the surface of the conductive portion 22 opposite to the first welding surface 120 forms a second welding surface 220.

[0346] It is understood that the second receiving groove 12120 is a groove body, which is a groove-shaped structure with a certain depth. For example, when the first pole post 12 is set on the upper end wall of the housing 11, and the outer end face 123 of the pole post is the upper surface of the first pole post 12, the second receiving groove 12120 is formed as a receiving groove with the groove opening facing upward and the groove wall concave downward. As another example, when the first pole post 12 is set on the lower end wall of the housing 11, and the outer end face 123 of the pole post is the lower surface of the first pole post 12, the second receiving groove 12120 is formed as a receiving groove with the groove opening facing downward and the groove wall concave upward.

[0347] In the above technical solutions, please refer to Figure 32On the one hand, the first electrode post 12 is provided with a second receiving groove 12120, which can reduce the weight of the first electrode post 12 to a certain extent, thereby increasing the weight energy density of the battery cell 10 and the battery 100. On the other hand, since the groove opening of the second receiving groove 12120 is formed on the outer end face 123 of the electrode post, and the outer end face 123 of the electrode post is the surface of the first electrode post 12 away from the active material coating part 21, the second receiving groove 12120 can be opened in the direction away from the active material coating part 21. In this way, when at least a part of the conductive part 22 is accommodated in the second receiving groove 12120, the conductive part 22 can be easily stored and organized through the groove opening of the second receiving groove 12120, and the electrical connection operation between the conductive part 22 and the first electrode post 12 can be easily achieved through the groove opening of the second receiving groove 12120, thereby reducing the production difficulty of the battery cell 10 and improving the production efficiency of the battery cell 10.

[0348] Meanwhile, since the second receiving groove 12120 can communicate with the interior of the housing 11 through the first perforation 12130, the second receiving groove 12120 can also serve as a buffer and temporary storage structure for the electrolyte, allowing the housing 11 to hold more electrolyte. Since the battery cell 10 loses electrolyte during charging and discharging, more electrolyte can extend the service life of the battery cell 10. Also, because the second receiving groove 12120 can communicate with the interior of the housing 11 through the first perforation 12130, the second receiving groove 12120 can also serve as a receiving and buffering structure for gas generated inside the cell assembly 2, reducing the expansion of the battery cell 10 and improving the reliability and stability of the battery cell 10.

[0349] It is worth noting that when the receiving part 121 has a second receiving groove 12120, and the conductive part 22 passes through the first through hole 12130 and is at least partially received in the second receiving groove 12120, the electrical connection position between the conductive part 22 and the first pole post 12 is not limited.

[0350] For example, when the conductive part 22 passes through the first through hole 12130 and is at least partially accommodated in the second receiving groove 12120, in some embodiments of this application, the electrical connection position between the conductive part 22 and the first pole post 12 is located on the hole wall of the first through hole 12130 formed by the first pole post 12.

[0351] In the above technical solution, by setting the electrical connection position between the conductive part 22 and the first electrode post 12 on the hole wall of the first through hole 12130, it is convenient to perform electrical connection operation between the conductive part 22 and the first electrode post 12 through the second receiving groove 12120. Moreover, when the electrical connection area between the conductive part 22 and the first electrode post 12 is large, the electrical connection between the conductive part 22 and the first electrode post 12 can be used to seal the first through hole 12130, thereby saving sealing costs, reducing electrolyte leakage, and saving sealing parts.

[0352] Specifically, the conductive part 22 can be welded to the hole wall of the first perforation 12130 at the position where the first perforation 12130 is connected to the second receiving groove 12120, which facilitates operation. Moreover, by controlling the solder stamp, the first perforation 12130 can be sealed by the solder stamp and the conductive part 22, thereby improving the problem of electrolyte leakage from the first perforation 12130 inside the housing 11.

[0353] As another example, when the conductive part 22 passes through the first through hole 12130 and is at least partially accommodated in the second receiving groove 12120, in some other embodiments of this application, the electrical connection position between the conductive part 22 and the first pole post 12 can also be located on the groove wall of the second receiving groove 12120 formed by the first pole post 12. This facilitates electrical connection operations; for example, when the conductive part 22 is welded to the groove wall of the second receiving groove 12120 formed by the first pole post 12, it can improve the situation where conductive particles generated during welding enter the housing 11, preventing problems such as short circuits.

[0354] Specifically, Figure 33 For a partial cross-sectional view of the battery cell 10 provided in some embodiments of this application, please refer to... Figure 32 and Figure 33 The first electrode post 12 includes a second end wall 12121 and a second side wall 12123. The second end wall 12121 is located on the side of the second side wall 12123 near the active material coating portion 21. The second end wall 12121 and the second side wall 12123 form a second receiving groove 12120. A first through hole 12130 is formed in the second end wall 12121. The electrical connection position between the conductive portion 22 and the first electrode post 12 is located in the second end wall 12121 and / or in the second side wall 12123. At this time, the wall surface of the second end wall 12121 and / or the second side wall 12123 forms a first welding surface 120, and the surface of the conductive portion 22 opposite to the first welding surface 120 forms a second welding surface 220.

[0355] More specifically, the conductive part 22 and the first electrode post 12 can be electrically connected by welding, so the welding position is the electrical connection position between the conductive part 22 and the first electrode post 12. In other embodiments of this application, the conductive part 22 and the first electrode post 12 can also be electrically connected by other means instead of welding, such as by using conductive adhesive or conductive nails, which will not be elaborated here.

[0356] For simplicity, the following description will use the example of the conductive part 22 being welded to the first electrode post 12 to form an electrical connection, with the welding position being the electrical connection position between the conductive part 22 and the first electrode post 12. For example, in some embodiments, the electrical connection position between the conductive part 22 and the first electrode post 12 is located at the second end wall 12121 and / or the second side wall 12123, which can be the welding of the conductive part 22 to at least one of the second end wall 12121 and the second side wall 12123.

[0357] In the above technical solution, by setting the electrical connection position between the conductive part 22 and the first pole post 12 on at least one of the second end wall 12121 and the second side wall 12123, the second receiving groove 12120 not only has the function of accommodating at least a portion of the conductive part 22, but the groove wall of the second receiving groove 12120 also has the function of electrically connecting with the conductive part 22, thereby simplifying the structure of the first pole post 12 and facilitating its processing. Moreover, since the first through hole 12130 is opened in the second end wall 12121, the conductive part 22 can easily extend into the second receiving groove 12120 through the first through hole 12130, which simplifies the structure of the conductive part 22, reduces redundancy in the conductive part 22, and lowers the cost of the conductive part 22. Furthermore, the open direction of the second receiving groove 12120 allows for easy electrical connection between the conductive part 22 and the groove wall of the second receiving groove 12120 through the groove opening, which reduces the difficulty of electrical connection. Moreover, by using the groove wall of the second receiving groove 12120 to achieve electrical connection with the conductive part 22, the area of electrical connection between the conductive part 22 and the first electrode post 12 can be relatively large, which can improve the reliability and stability of electrical connection, thereby improving the performance of the battery cell 10.

[0358] Furthermore, since the electrical connection between the conductive part 22 and the first pole post 12 is located within the second receiving groove 12120, it not only prevents the electrical connection from protruding outside the first pole post 12 and occupying space outside the first pole post 12, but also allows the electrical connection to be protected by the first pole post 12, thereby improving the reliability and stability of the electrical connection between the conductive part 22 and the first pole post 12.

[0359] Please refer to this again. Figure 32 and Figure 33 In some embodiments, the partial shape of the conductive portion 22 matches the partial shape of the second end wall 12121, and they are fitted together to achieve an electrical connection, such that the position where the conductive portion 22 is electrically connected to the second end wall 12121 extends along the length or width direction of the second end wall 12121. For example, when the second end wall 12121 is planar, a portion of the conductive portion 22 can also be planar and fitted to the second end wall 12121, and an electrical connection, such as welding, can be performed at the fitted position. This increases the area of the electrical connection and improves the reliability and stability of the electrical connection.

[0360] It is worth noting that the shape of the second end wall 12121 is not limited, for example, it can be a flat plate or an arc-shaped plate structure. When the second end wall 12121 is a flat plate structure, the second end wall 12121 is arranged at an angle to the axial direction R of the first pole post 12. For example, it can be a flat plate structure perpendicular to the axial direction R of the first pole post 12, or it can be an inclined flat plate structure that is not perpendicular to the axial direction R of the first pole post 12, but the inclination direction is not limited.

[0361] For example, please refer to Figure 32 and Figure 33 When the second end wall 12121 has a flat plate structure, the angle θ between the second end wall 12121 and the axial direction R of the first pole post 12 is equal to 90°. That is, along the direction from the first through hole 12130 to the second side wall 12123, the second end wall 12121 and the active material coating part 21 are equidistant. This facilitates the welding of the conductive part 22 to the second end wall 12121.

[0362] For example, Figure 34 For a partial cross-sectional view of the battery cell 10 provided in some embodiments of this application, please refer to... Figure 34 The angle θ between the second end wall 12121 and the axial direction R of the first pole post 12 is greater than 90°. That is, along the direction from the first through hole 12130 to the second side wall 12123, the second end wall 12121 extends obliquely towards the active material coating portion 21. Therefore, the extension distance of the conductive portion 22 along the second end wall 12121 can be increased, thereby increasing the reliability of the electrical connection. For example, the angle θ between the second end wall 12121 and the axial direction R of the first pole post 12 can be 90°-145°, such as 100°, 110°, 120°, 130°, 140°, etc., which on the one hand makes the second end wall 12121 easier to process and facilitates electrical connection with the conductive portion 22, and on the other hand allows for more efficient use of the space within the first pole post 12 to accommodate the conductive portion 22.

[0363] For example, Figure 35 This is a partial cross-sectional schematic diagram of a battery cell 10 provided in some embodiments of this application, in conjunction with... Figure 35The angle θ between the second end wall 12121 and the axial direction R of the first pole post 12 is less than 90°, that is, along the direction from the first through hole 12130 to the second side wall 12123, the second end wall 12121 extends obliquely away from the active material coating portion 21. Therefore, the extension distance of the conductive portion 22 along the second end wall 12121 can be increased, thereby increasing the reliability of the electrical connection. For example, the angle θ between the second end wall 12121 and the axial direction R of the first pole post 12 can be 45°-90°, such as 50°, 60°, 70°, 80°, etc., which on the one hand makes the second end wall 12121 easier to process and facilitates electrical connection with the conductive portion 22, and on the other hand allows for more efficient use of the space within the first pole post 12 to accommodate the conductive portion 22.

[0364] Of course, in other embodiments of this application, the position where the conductive part 22 is electrically connected to the second end wall 12121 may not extend along the length or width direction of the second end wall 12121. Instead, it may be a plurality of discretely arranged points. For example, the conductive part 22 may have a plurality of spaced-apart portions that are welded to the second end wall 12121 respectively. This will not be elaborated here.

[0365] Please refer to this again. Figure 33 Regardless of the specific value of the angle θ between the second end wall 12121 and the first pole post 12 along the axial direction R, in the embodiments of this application, when the conductive part 22 is electrically connected to the second end wall 12121, the second receiving groove 12120 can be provided with a second sinking groove 12122 as needed. The sinking direction of the second sinking groove 12122 is close to the direction of the active material coating part 21, and the position where the conductive part 22 is electrically connected to the first pole post 12 is at least partially located within the second sinking groove 12122.

[0366] For example, the second receiving groove 12120 has a second end wall 12121 and a second side wall 12123. A second sink groove 12122 is provided on the second end wall 12121. The position where the conductive part 22 is electrically connected to the second end wall 12121 is at least partially located in the second sink groove 12122. At this time, the second sink groove 12122 is a groove formed by a portion of the second end wall 12121 sinking towards the end near the active material coating part. At this time, the bottom of the second sink groove 12122, that is, the wall surface of the second sink groove 12122 near the active material coating part 21, forms a first welding surface 120, and the surface of the conductive part 22 opposite to the first welding surface 120 forms a second welding surface 220.

[0367] In the above technical solution, the portion of the conductive part 22 located in the second sink 12122 is configured to match the shape of the second sink 12122 and fit together to achieve electrical connection. This allows the second sink 12122 to be used to pre-position and limit the electrical connection position of the conductive part 22, which is beneficial for accurately finding the position to achieve electrical connection, improving production efficiency, and improving the stability and reliability of the electrical connection position, so as to ensure the reliability and stability of the charging and discharging operation of the battery cell 10.

[0368] It should be noted that, in the embodiments of this application, a portion of the conductive part 22 can also be configured to match and fit the shape of the second sidewall 12123. For example, when the second sidewall 12123 is curved, a portion of the conductive part 22 can also be curved and fit against the second sidewall 12123, and an electrical connection (e.g., welding) can be made at the fitting position so that the position where the conductive part 22 is electrically connected to the second sidewall 12123 extends along the second sidewall 12123. This increases the area of the electrical connection, thereby improving the reliability and stability of the electrical connection.

[0369] It should also be noted that in other embodiments of this application, the position where the conductive part 22 is electrically connected to the second sidewall 12123 may not extend along the second sidewall 12123. For example, it may be a plurality of discretely arranged points. For example, the conductive part 22 has a plurality of spaced portions that are welded to the second sidewall 12123 respectively, which will not be elaborated here.

[0370] It is understood that the number of second sidewalls 12123 is not limited and can be determined according to the shape of the second receiving groove 12120. However, the end of each second sidewall 12123 away from the opening of the second receiving groove 12120 should be connected to the second end wall 12121. For example, when the cross-sectional shape of the second receiving groove 12120 is circular or elliptical, the second end wall 12121 is circular or elliptical, and the number of second sidewalls 12123 is one, which is annular and surrounds the circumferential edge of the second end wall 12121. As another example, when the cross-sectional shape of the second receiving groove 12120 is rectangular or racetrack-shaped, the second end wall 12121 is rectangular or racetrack-shaped, and the number of second sidewalls 12123 is four, which are respectively connected to the four sides of the second end wall 12121.

[0371] It should also be noted that the second receiving groove 12120 is not limited to the form defined by the second end wall 12121 and the second side wall 12123. For example, in some embodiments, Figure 36 For a partial cross-sectional view of a battery cell provided in some embodiments of this application, please refer to... Figure 36Each second sidewall 12123 extends from the end of the slot away from the second receiving groove 12120 to the first through hole 12130, so that the second receiving groove 12120 is defined only by the multiple second sidewalls 12123. At this time, the conductive part 22 can be electrically connected to the second sidewall 12123.

[0372] In some embodiments, please refer to Figure 48 The receiving portion 121 may simultaneously have a third receiving groove 12140 and a second receiving groove 12120. The second receiving groove 12120 is located on the side of the third receiving groove 12140 away from the active material coating portion 21. The third receiving groove 12140 is a groove body with a certain depth. The groove opening of the third receiving groove 12140 is formed on the inner end face 122 of the first electrode post 12 on the side near the active material coating portion 21. The groove opening of the second receiving groove 12120 is formed on the inner end face 122 of the first electrode post 12. On the outer end face 123 of the pole post away from the active material coating part 21, the third receiving groove 12140 and the second receiving groove 12120 are connected through the first through hole 12130. At this time, a part of the conductive part 22 is located in the third receiving groove 12140, and the conductive part 22 is also inserted through the first through hole 12130. The remaining part of the conductive part 22 is located in the second receiving groove 12120. Thus, the space inside the first pole post 12 can be made more fully, and the space occupied by the conductive part 22 in the housing 11 can be reduced.

[0373] It is worth noting that when the conductive part 22 is connected to the second end wall 12121 or the second side wall 12123 by laser welding, please refer to [the relevant documentation] again. Figure 36 The angle β between the portion of the conductive part 22 used for welding and the axis of the first through hole 12130 can be set to be greater than 5° to reduce the problem of laser entering the housing 11 through the first through hole 12130 and to facilitate the welding operation. In addition, when the angle β between the portion of the conductive part 22 used for welding and the axis of the first through hole 12130 is close to 5°, edge welding can be used, and the rest can be done by lap welding.

[0374] Please refer to this again. Figure 32 In the embodiments of this application, the connection method between the first pole 12 and the housing 11 is not limited. For example, it can be welding or riveting. For instance, when the two are joined by riveting, the housing 11 has a mounting hole 113, and the first pole 12 is riveted and installed in the mounting hole 113. Of course, it is understood that when the two are joined by welding or other methods, the housing 11 may also have a mounting hole 113, and the first pole 12 is installed in the mounting hole 113.

[0375] Alternatively, please refer to Figure 32The second receiving groove 12120 can be set at the position corresponding to the mounting hole 113. In other words, on the projection plane perpendicular to the axial direction R of the first pole post 12, the orthographic projection of the second receiving groove 12120 is located within the orthographic projection range of the mounting hole 113, so that the second receiving groove 12120 can have a larger depth to accommodate more conductive parts 22, thereby reducing the space occupied by the conductive parts 22 in the housing 11 to a greater extent.

[0376] In some embodiments, please refer again Figure 32 Along the axial direction R of the first pole post 12, the depth H3 of the second receiving groove 12120 is greater than or equal to the minimum distance H4 from the outer end face 123 of the pole post to the mounting hole 113.

[0377] It should be noted that the specific shape of the second receiving groove 12120 is not limited; it can be a regular shape or an irregular shape. For example, it can be a cylindrical groove with a rectangular, elliptical, or racetrack-shaped cross-section; a trapezoidal groove with a rectangular cross-section and gradually changing dimensions; a hemispherical groove with a circular cross-section and gradually changing dimensions; or a semi-ellipsoidal groove with an elliptical cross-section and gradually changing dimensions, etc. It is worth noting that the racetrack shape mentioned in this article refers to a shape where the two shorter sides of a rectangle are replaced by outwardly convex curves. For example, please refer to... Figure 38 (b) shows the shape.

[0378] Therefore, the depth H3 of the second receiving groove 12120 refers to the maximum depth of the second receiving groove 12120 along the axial direction R of the first electrode post 12. Since the depth H3 of the second receiving groove 12120 along the axial direction R of the first electrode post 12 is greater than or equal to the minimum distance H4 from the outer end face 123 of the electrode post to the mounting hole 113, the volume of the first electrode post 12 can be fully utilized, resulting in a larger depth of the second receiving groove 12120. This is beneficial for accommodating more conductive parts 22, thereby reducing the space occupied by the conductive parts 22 in the housing 11 to a greater extent, further improving the energy density of the battery cell 10, and further reducing the redundancy of the conductive parts 22 in the housing 11. At the same time, since the second receiving groove 12120 has a larger depth, it can also accommodate the gas generated by the cell assembly 2, ensuring the reliability and stability of the battery cell 10, and can also accommodate more electrolyte to ensure the service life of the battery cell 10.

[0379] It should be noted that the volume of the second receiving groove 12120 is not limited. For example, in some specific examples, the volume of the second receiving groove 12120 used to accommodate the conductive part 22 (denoted as the third volume V4) can be greater than or equal to 298 mm. 3This allows the second receiving groove 12120 to have sufficient space to accommodate the conductive part 22, and facilitates the welding of the conductive part 22 to the first electrode post 12. However, when the third volume V4 of the second receiving groove 12120 is less than 298 mm²... 3 At this time, the second receiving groove 12120 has a relatively reduced capacity to accommodate the conductive part 22, and the welding difficulty between the conductive part 22 and the first pole post 12 is increased. For example, the third volume V4 of the second receiving groove 12120 can be 300 mm². 3 400mm 3 500mm 3 600mm 3 700mm 3 800mm 3 1000mm 3 etc.

[0380] It is worth noting that the third volume V4 of the second receiving groove 12120 is the difference between the total volume V5 of the second receiving groove 12120 and the volume (denoted as the fourth volume V6) of the second receiving groove 12120 needed to accommodate other components besides the conductive part 22 (such as the first cover plate 13 and the second cover plate 14 described herein), i.e., V4 = V5 - V6. For example, in some specific examples, the total volume V5 of the second receiving groove 12120 can be 1400 mm². 3 -1500mm 3 This allows the second receiving groove 12120 to have more space to accommodate the conductive part 22 and other components. For example, the total volume V5 of the second receiving groove 12120 can be 1420 mm². 3 1440mm 3 1460mm 3 1480mm 3 1490mm 3 etc.

[0381] In the embodiments of this application, the shape of the first perforation 12130, the number of the first perforations 12130, and the relative positional relationship between the first perforation 12130 and the second receiving groove 12120 are not limited.

[0382] For example, Figure 37 for Figure 3 A magnified view of a portion of point W; Figure 38 For orthographic views of various first pole posts 12 provided in some embodiments of this application, please refer to... Figure 37 and Figure 38In the embodiments of this application, the shape of the first through-hole 12130 can be elongated to match the sheet-like partial shape of the conductive part 22, thereby facilitating the passage of the sheet-like partial conductive part 22. Simultaneously, when the first through-hole 12130 is elongated, the second receiving groove 12120 can also be constructed with a cross-sectional length greater than its width, such as a rectangle, ellipse, racetrack shape, etc. In this case, the length direction of the first through-hole 12130 can be set to be consistent with the length direction of the cross-section of the second receiving groove 12120, thereby making full use of space. Furthermore, the solder mark formed by welding the conductive part 22 and the first electrode post 12 can be an elongated solder mark parallel to the length direction of the first through-hole 12130 to improve welding reliability and increase current carrying capacity. For example, when the conductive part 22 is welded to the second end wall 12121 to form a long strip-shaped weld mark, the width of the weld mark can be greater than or equal to 6 mm, and the distance between the weld mark and the second side wall 12123 can be greater than or equal to 1 mm, so as to ensure the overcurrent capacity of the battery cell 10 while ensuring the convenience and reliability of welding.

[0383] Regarding the size and number of the first through hole 12130, in the embodiments of this application, the size and specific location of the first through hole 12130 on the second receiving groove 12120 are not limited, and the design can be based on the number of first through holes 12130. For example, the width of the first through hole 12130 can be greater than or equal to 2mm, which is beneficial for the conductive part 22 to pass through. For example, when there is only one first through hole 12130 on the second receiving groove 12120, please refer to some examples. Figure 37 and Figure 38 The first perforation 12130 can be centered relative to the second receiving groove 12120. In other examples, Figure 39 For a partial cross-sectional view of the battery cell 10 provided in some embodiments of this application, please refer to... Figure 39 The first perforation 12130 can also be offset relative to the center of the second receiving groove 12120. For example, in some embodiments, please refer to Figure 39 The first through hole 12130 can be formed at the edge of the second end wall 12121 and set close to the second side wall 12123, thereby increasing the usable area of the second end wall 12121 and increasing the welding area between the conductive part 22 and the second end wall 12121.

[0384] Understandably, after the conductive part 22 passes through the first through hole 12130, it will fold over to fit against the second end wall 12121, but the direction of folding is not limited. For example, when the first through hole 12130 is centered relative to the second receiving groove 12120, the conductive part 22 can fold over towards either side of the first through hole 12130 after passing through it (see reference). Figure 37 This allows for a suitable reduction in the size of the second receiving groove 12120, enhancing structural compactness and strength; alternatively, after the conductive part 22 passes through the first through hole 12130, it can also be folded simultaneously towards opposite sides. Figure 40 For a partial cross-sectional view of the battery cell 10 provided in some embodiments of this application, please refer to... Figure 40 This reduces the thickness of the weld joint, lowers the heat input during welding, and thus reduces problems such as particle spatter.

[0385] For example, when there are multiple first through holes 12130 on the second receiving groove 12120, the multiple first through holes 12130 are arranged parallel or substantially parallel in their length directions to make full use of space. In this case, the folding direction of the conductive part 22 after passing through the first through hole 12130 can be set according to the relative positional relationship of the multiple first through holes 12130. For example, when there are two first through holes 12130 on the second receiving groove 12120 and they are far apart from each other ( Figure 41 This is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of this application, combined with... Figure 41 The two conductive parts 22 passing through the two first perforations 12130 can be folded toward each other; while when there are two first perforations 12130 on the second receiving groove 12120 and they are close to each other, the two conductive parts 22 passing through the two first perforations 12130 can be folded toward each other.

[0386] It is understandable that when there are multiple first perforations 12130 on the second receiving groove 12120, the number of first pole posts 12 can be appropriately reduced, thereby reducing costs and processes.

[0387] In addition, in some embodiments, please refer to Figure 39 and Figure 40 The first perforation 12130 can be centered relative to the active material coating part 21, but the position of the first perforation 12130 relative to the second receiving groove 12120 is not limited. It can be centered or offset. Since the first perforation 12130 is centered relative to the active material coating part 21, the conductive part 22 can be gathered to correspond to the center line position of the active material coating part 21.

[0388] In some embodiments, please refer to Figure 40A first sealing element 6 can be provided at the first perforation 12130 to improve the problem of electrolyte leakage from the housing 11 through the first perforation 12130. The material, shape, and connection method of the first sealing element 6 to the first perforation 12130 are not limited. For example, the sealing element 6 can be a metal part of the same material as the first electrode 12 or the conductive part 22, which can be welded to the wall surface of the first perforation 12130 of the first electrode 12 to seal the first perforation 12130. Alternatively, the sealing element 6 can be a plastic part that is inserted into the first perforation 12130 to seal the first perforation 12130. In the embodiments of this application, the design can be tailored to actual requirements and is not limited.

[0389] Figure 42 Exploded views of the structure of a battery cell 10 provided in some embodiments of this application; Figure 43 This is a partial cross-sectional schematic diagram of the housing assembly 1 provided in some embodiments of this application, in conjunction with... Figure 42 and Figure 43 In the embodiments of this application, when the receiving part 121 has the second receiving groove 12120 of any of the above embodiments, the housing assembly 1 may optionally further include a first cover plate 13, the first cover plate 13 cooperates with the first pole post 12 and closes the opening of the second receiving groove 12120, and the first cover plate 13 is electrically connected to the first pole post 12.

[0390] In the above technical solution, by setting the first cover plate 13 to close the opening of the second receiving tank 12120, the electrolyte in the housing 11 can be prevented from leaking out of the opening of the second receiving tank 12120. Moreover, since the first cover plate 13 closes the opening of the second receiving tank 12120 and is electrically connected to the first electrode 12, the first electrode 12 can be easily connected to the busbar component by using the first cover plate 13. This also helps to increase the connection area at the electrical connection point, thereby helping to reduce the resistance at the electrical connection point.

[0391] It is worth noting that the method and position of the engagement between the first cover plate 13 and the first pole post 12 are not limited, as long as the first cover plate 13 can close the opening of the second receiving groove 12120. For example, in some embodiments, please refer to... Figure 44 The first cover plate 13 can be welded to the first pole post 12. During processing, the conductive part 22 can be passed through the first through hole 12130 and welded to the groove wall of the second receiving groove 12120. Then the first cover plate 13 is welded to the first pole post 12 to seal the groove opening of the second receiving groove 12120.

[0392] It should also be noted that the specific configuration of the first cover plate 13 is not limited. For example, in some alternative embodiments, Figure 43 Partial cross-sectional schematic diagram of the housing assembly provided for some embodiments of this application; Figure 44 for Figure 43 The exploded view of the housing assembly shown is shown. Figure 45 for Figure 44 Please refer to the exploded view of the first cover plate 13 shown below. Figures 43-45 The first cover plate 13 includes a first conductive element 131 and a second conductive element 132 made of different materials. The first conductive element 131 is engaged with and electrically connected to the first pole post 12, and the second conductive element 132 is engaged with and electrically connected to the first conductive element 131.

[0393] In the above technical solution, the first cover plate 13 is configured as a composite form, and the first conductive element 131 is made of the same material as the first terminal 12, thereby facilitating the electrical connection between the first conductive element 131 and the first terminal 12. For example, the first conductive element 131 and the first terminal 12 can be reliably and stably connected by welding. Furthermore, since the second conductive element 132 is made of a different material than the first conductive element 131, it is convenient to use the second conductive element 132 to make electrical connections with busbar components made of a different material than the first terminal 12. For example, the second conductive element 132 can be reliably and stably connected with busbar components made of the same material as the second conductive element 132 by welding.

[0394] For example, when the first terminal 12 is the negative terminal, and the first terminal 12 is made of copper and the busbar is made of aluminum, the first conductive element 131 can be made of copper and the second conductive element 132 can be made of aluminum. In this case, the first terminal 12 and the first conductive element 131 are made of the same material and can be effectively welded, and the second conductive element 132 is made of the same material as the busbar and can also be effectively welded. This effectively achieves an indirect electrical connection between the first terminal 12 and the busbar through the first cover plate 13. Furthermore, the welding of the first terminal 12 and the first conductive element 131, which are made of copper, has good fluidity, is less prone to cracking, and helps improve the sealing effect at the weld.

[0395] Please refer to this again. Figures 43-45 In some alternative examples, the first conductive element 131 is located between the second receiving tank 12120 and the second conductive element 132. In the above technical solution, since the first conductive element 131 is located between the second receiving tank 12120 and the second conductive element 132, the second receiving tank 12120 and the second conductive element 132 can be separated. Thus, when the electrolyte in the housing 11 enters the second receiving tank 12120 through the first perforation 12130, the first conductive element 131 can be used to prevent this part of the electrolyte from contacting the second conductive element 132, thereby solving the problem of electrolyte corrosion of the second conductive element 132.

[0396] It is worth noting that the cooperation method between the first conductive element 131 and the second conductive element 132 is not limited. For example, in some embodiments, please refer to... Figures 43-45The first conductive element 131 has a second groove 1311, and the second conductive element 132 is embedded in the second groove 1311. The opening of the second groove 1311 is formed on the surface of the first conductive element 131 on the side away from the second receiving groove 12120, so that the second conductive element 132 is exposed through the opening of the second groove 1311. Alternatively, in other embodiments, the connection method of the first conductive element 131 and the second conductive element 132 can also be a fastening connection, snap-fit, etc.

[0397] It should also be noted that the "exposed" in the phrase "the second conductive element 132 is exposed by the groove opening of the second groove 1311" means that the first conductive element 131 does not obstruct the second conductive element 132 at the groove opening position of the second groove 1311. It is not required that the second conductive element 132 protrude from the groove opening of the second groove 1311. For example, the second conductive element 132 can be flush with the surface of the first conductive element 131 on the side away from the second receiving groove 12120, or the second conductive element 132 can protrude from the surface of the first conductive element 131 on the side away from the second receiving groove 12120.

[0398] In the above technical solution, on the one hand, by embedding the second conductive element 132 within the first conductive element 131, the assembly difficulty of the first conductive element 131 and the second conductive element 132 can be reduced, the stability and convenience of the cooperation between the first conductive element 131 and the second conductive element 132 can be improved, and the thickness of the first cover plate 13 can be reduced, thus reducing the space occupied by the first cover plate 13 and improving the space utilization rate of the battery cell 10. On the other hand, since the second conductive element 132 can be exposed from the surface of the first conductive element 131 away from the second receiving groove 12120 through the slot of the second groove 1311, it is beneficial to realize the electrical connection between the second conductive element 132 and the busbar component outside the first terminal post 12.

[0399] Furthermore, since the opening of the second groove 1311 is formed on the surface of the first conductive member 131 on the side away from the second receiving groove 12120, it means that the second groove 1311 is open in the direction away from the active material coating portion 21. As a result, the portion of the first conductive member 131 that defines the groove wall of the second groove 1311 is located between the second receiving groove 12120 and the second conductive member 132, thereby separating the second receiving groove 12120 and the second conductive member 132, thereby preventing the electrolyte entering the second groove 1311 from contacting the second conductive member 132 and reducing electrolyte leakage.

[0400] Of course, in other embodiments, the first cover plate 13 may not be a composite material made of multiple materials, as in other embodiments of this application. Figure 46 This is a partial cross-sectional schematic diagram of a battery cell 10 provided in some embodiments of this application. Figure 47 for Figure 46Please refer to the exploded view of the battery cell shown below. Figure 46 and Figure 47 Alternatively, the first cover plate 13 can be made entirely of the same material in a non-composite form, for example, to adapt to the positive electrode post, which will not be elaborated here.

[0401] Please refer to this again. Figures 43-45 In some embodiments, the first cover plate 13 is also embedded in the opening of the second receiving groove 12120. In the above technical solution, by embedding the first cover plate 13 within the second receiving groove 12120, the assembly difficulty of the first cover plate 13 and the first electrode post 12 can be reduced, the assembly stability of the first cover plate 13 and the first electrode post 12 can be improved, as well as the reliability and convenience of the connection. Furthermore, the space occupied by the first cover plate 13 outside the first electrode post 12 can be reduced. Moreover, since the first cover plate 13 is embedded in the opening of the second receiving groove 12120, the second receiving groove 12120 can have sufficient space to accommodate the conductive part 22.

[0402] Of course, in other embodiments of this application, the first cover plate 13 and the first pole post 12 are not limited to being embedded in the second receiving groove 12120. The first cover plate 13 can also be directly covered outside the first pole post 12, that is, directly covered at the opening of the second receiving groove 12120, so as to facilitate cooperation with the current collection component of the battery 100. This embodiment does not limit this.

[0403] Please refer to this again. Figures 43-46 Optionally, in an embodiment of this application, at least a portion of the wall surface at the opening of the second receiving groove 12120 formed by the first pole post 12 is a guide slope 12126, which guides the first cover plate 13 to engage with the opening of the second receiving groove 12120. In the above technical solution, by processing the wall surface at the opening of the second receiving groove 12120 into a guide slope, the assembly difficulty of the first cover plate 13 and the second receiving groove 12120 can be reduced, and the assembly efficiency of the first cover plate 13 and the second receiving groove 12120 can be improved. Furthermore, when the first cover plate 13 is welded to the guide slope 12126, the area of the weld joint can be increased, improving the reliability of the weld connection between the first cover plate 13 and the first pole post 12, and mitigating the problems of molten pool collapse or laser penetration into the first pole post 12 during welding.

[0404] Specifically, please refer to Figures 43-45The second receiving groove 12120 includes a first groove segment 12124 and a second groove segment 12125 located on the side of the first groove segment 12124 near the outer end face 123 of the pole post. The cross-sectional area of the second groove segment 12125 is larger than that of the first groove segment 12124, making the second receiving groove 12120 a stepped groove, and forming a stepped surface 12127 at the connection position of the first groove segment 12124 and the second groove segment 12125. This allows the first cover plate 13 to be specifically embedded in the second groove segment 12125 and supported on the stepped surface 12127 when it is embedded in the second receiving groove 12120.

[0405] In the above technical solution, by setting the second receiving groove 12120 as a stepped groove, the first cover plate 13 can be stably matched with the groove opening of the second receiving groove 12120, thereby improving the connection stability between the first cover plate 13 and the first pole post 12. Moreover, by limiting the groove depth of the first groove segment 12124, the second receiving groove 12120 can have sufficient space to accommodate the conductive part 22.

[0406] Furthermore, when the wall surface at the opening of the second receiving groove 12120 formed by the first pole post 12 is a guide slope 12126, the cross-sectional area of the second groove segment 12125 can be set to gradually increase along the direction close to the outer end face 123 of the pole post, so that the side wall of the second groove segment 12125 is formed as a guide slope 12126, which facilitates processing and can simply and effectively meet the guiding requirements.

[0407] Please refer to this again. Figures 43-45 In embodiments of this application, the first cover plate 13 may also have a stress relief groove 133 as needed. The stress relief groove 133 is located in the outer peripheral area of the first cover plate 13 to assist the first cover plate 13 in stress relief. In the above technical solution, by providing a stress relief groove 133 on the first cover plate 13, the stress generated by the first cover plate 13 during its own processing or during the electrical connection between the first cover plate 13 and the first pole post 12 can be released, thereby improving problems such as deformation or damage caused by stress on the first cover plate 13.

[0408] Specifically, when the first cover plate 13 is embedded and welded to the second receiving groove 12120, the stress relief groove 133 can be used to release the stress generated by welding, improve the lateral heat conduction, and reduce the probability of damage or deformation of the first cover plate 13. Simultaneously, when the first cover plate 13 is a composite form including the first conductive element 131 and the second conductive element 132, the stress relief groove 133 can be disposed on the first conductive element 131 and located in the outer peripheral area of the second conductive element 132. When the first conductive element 131 is embedded and welded to the second receiving groove 12120, the stress relief groove 133 can be used to release the stress generated by welding, improve the lateral heat conduction, and reduce the probability of damage or deformation of the second conductive element 132. Furthermore, when the second conductive element 132 is embedded and welded to the first conductive element 131, the stress relief groove 133 can be used to release the stress generated by welding, improve the lateral heat conduction, and reduce the probability of deformation of the first conductive element 131, which could prevent the first conductive element 131 from being embedded in the second receiving groove 12120.

[0409] Figure 47 for Figure 46 Please refer to the exploded view of the battery cell shown below. Figures 46-47 In the embodiments of this application, the housing assembly 1 may also be provided with a second cover plate 14 as needed. The second cover plate 14 covers the first through hole 12130 and the conductive part 22 located in the second receiving groove 12120.

[0410] It is worth noting that when the housing assembly 1 includes the second cover plate 14, the housing assembly 1 may also include the first cover plate 13, or may not include the first cover plate 13 at the same time. Furthermore, when the housing assembly 1 includes both the second cover plate 14 and the first cover plate 13, the first cover plate 13 may be a composite material made of multiple materials, or it may be a non-composite material made of the same material.

[0411] In the above technical solution, at least a portion of the conductive part 22 is located in the second receiving tank 12120, and the second cover plate 14 is provided on the conductive part 22. The second cover plate 14 also covers the first through hole 12130. So when the electrolyte enters the second receiving tank 12120 from the first through hole 12130, the second cover plate 14 can improve the problem of the electrolyte overflowing from the first electrode post 12, thereby improving the reliability of the battery cell 10.

[0412] For example Figures 46-47As shown, when a portion of the conductive part 22 is sandwiched between the second cover plate 14 and the second end wall 12121, laser welding can be used to weld the portion of the conductive part 22, the second cover plate 14, and the second end wall 12121 together, thereby improving the reliability of the connection between the first pole post 12 and the conductive part 22. Furthermore, since the second cover plate 14 can press the conductive part 22 firmly, the stability of the conductive part 22 within the second receiving groove 12120 can be improved.

[0413] In the embodiments of this application, the first electrode post 12 can be a one-piece molded electrode post or a composite electrode post formed in parts. Please refer again. Figures 46-47 For example, the first electrode post 12 may include a first electrode post portion 124 and a second electrode post portion 125 that are made of different materials and electrically connected. The second electrode post portion 125 is located on the side of the first electrode post portion 124 away from the active material coating portion 21. The receiving portion 121 is disposed in the first electrode post portion 124, or the receiving portion 121 is disposed in the first electrode post portion 124 and the second electrode post portion 125. The conductive portion 22 is electrically connected to the first electrode post portion 124.

[0414] In the above technical solution, by setting the first electrode post 12 as a composite form composed of different materials, the first electrode post 124 located on the inner side is housed and electrically connected to the conductive part 22, and the second electrode post 125 located on the outer side is electrically connected to the current-collecting component, which facilitates the assembly and electrical connection of the first electrode post 12 with related components, reduces the mutual interference between the electrical connection position of the first electrode post 12 and the conductive part 22 and the electrical connection position of the first electrode post 12 and the current-collecting component of the battery 100, and improves the reliability and stability of the battery cell 10.

[0415] For example, when the material of the conductive part 22 is different from that of the bus component, the first terminal 124 can be made of the same material as the conductive part 22, and the second terminal 125 can be made of the same material as the bus component. This facilitates the welding of the second terminal 125 to the bus component and the welding of the first terminal 124 to the conductive part 22, thereby improving the reliability and stability of the electrical connection between the conductive part 22 and the first terminal 12, as well as the reliability and stability of the electrical connection between the first terminal 12 and the bus component.

[0416] Furthermore, when the first pole post 12 is a composite form of the above embodiments and has the second receiving groove 12120 and the first through hole 12130 of any of the above embodiments, in some embodiments, the housing assembly 1 may also include the second cover plate 14 of any of the above embodiments. In this case, the material of the second cover plate 14 and the first pole post 124 can be set to be the same, and the first pole post 124 and the second cover plate 14 can be electrically connected, thereby improving the reliability and stability of the electrical connection between the first pole post 124 and the second cover plate 14. For example, the first pole post 124 and the second cover plate 14 can be connected by welding.

[0417] For example, please refer to Figures 46-47 When the first terminal 12 is the negative terminal, the first terminal part 124 is made of copper, the second terminal part 125 is made of aluminum, and the busbar component is made of aluminum sheet, the second cover plate 14 can be made of copper and the first cover plate 13 can be made of aluminum. In this case, the second cover plate 14 and the first terminal part 124 are made of the same material and can be effectively welded, the second terminal part 125 and the first cover plate 13 are made of the same material and can be effectively welded, and the first cover plate 13 and the busbar component are made of the same material and can be effectively welded.

[0418] In the embodiments of this application, when the receiving portion 121 has a second receiving groove 12120, the cooperation between the battery cell assembly 2 and the second receiving groove 12120 is not limited depending on the different configurations of the battery cell assembly 2. For example, it may include, but is not limited to, the following third and fourth embodiments.

[0419] Figure 48 For a partial cross-sectional view of a battery cell provided in some embodiments of this application, please refer to... Figure 48 In the third embodiment, the active material coating portion 21 includes a current collector 211 and an active material layer 212 disposed on the current collector 211. The conductive portion 22 includes a tab portion 221 electrically connected to the current collector 211. The tab portion 221 includes a plurality of tab pieces 2211. The plurality of tab pieces 2211 converge near the current collector 211 to form a first gathering portion 2212. The plurality of tab pieces 2211 converge away from the current collector 211 and connect to form a second gathering portion 2213. The first gathering portion 2212 connects the second gathering portion 2213 and the active material coating portion 21. When the receiving portion 121 has a second receiving groove 12120, at least a portion of the second gathering portion 2213 is received within the second receiving groove 12120. In this case, the groove wall of the second receiving groove 12120 forms a first welding surface 120, and the surface of the second gathering portion 2213 opposite to the first welding surface 120 forms a second welding surface 220.

[0420] It is worth noting that the specific configuration of the battery cell assembly 2 in this third embodiment is basically the same as that in the first embodiment described above, and can be referred to the description in the first embodiment, which will not be repeated here. In this third embodiment, since the tab portion 221 includes a second gathering portion 2213 formed by the convergence and connection of multiple tab pieces 2211, at least a portion of the second gathering portion 2213 can be easily accommodated in the second receiving groove 12120, which facilitates the assembly of the conductive portion 22 and the first electrode post 12.

[0421] In some optional examples, please refer to Figure 48 The connection position of the first gathering part 2212 and the second gathering part 2213 can be set to correspond to the first through hole 12130. That is, on the projection plane perpendicular to the axial direction R of the first pole post 12, the orthographic projection of the connection position of the first gathering part 2212 and the second gathering part 2213 is located within the orthographic projection range of the first through hole 12130. This makes it easier for the second gathering part 2213 to extend into the first through hole 12130 with a shorter distance and enter the second receiving groove 12120, reducing redundancy and lowering costs.

[0422] It is understood that the closing position of the tab 2211 can be designed according to the position of the first through hole 12130. For example, a symmetrical closing form or an asymmetrical closing form can be adopted, so that the connection position between the first closing part 2212 and the second closing part 2213 corresponds to the first through hole 12130. This will not be elaborated here. In addition, referring to the above, when the second closing part 2213 is formed into a plate structure by ultrasonic pre-welding, it is convenient for the second closing part 2213 to pass through the first through hole 12130.

[0423] Please refer to Figure 48 In this third embodiment, in addition to having a second receiving groove 12120, the receiving portion 121 may also have a third receiving groove 12140. The third receiving groove 12140 is located on the side of the second receiving groove 12120 that is close to the active material coating portion 21. The surface of the first pole post 12 facing the active material coating portion 21 is the inner end face 122 of the pole post, and the groove opening of the third receiving groove 12140 is formed on the inner end face 122 of the pole post. The third receiving groove 12140 and the second receiving groove 12120 are connected through a first through hole 12130. At this time, at least a portion of the first gathering portion 2212 can be accommodated in the third receiving groove 12140.

[0424] In the above technical solution, at least a portion of the first gathering portion 2212 of the tab 221 is accommodated in the third receiving groove 12140, and at least a portion of the second gathering portion 2213 is accommodated in the second receiving groove 12120. This allows for more efficient use of the space within the first electrode post 12, further reducing the space occupied by the tab 221 within the housing 11, in order to accommodate a larger active material coating portion 21, thereby increasing the energy density of the battery cell 10. Furthermore, it can better reduce the redundancy of the tab 221 within the housing 11, further reducing the probability of short circuit between the tab 221 and the active material coating portion 21, and further reducing the risk of the tab 221 being inserted upside down toward the active material coating portion 21.

[0425] It should be noted that the specific shape of the third receiving groove 12140 is not limited. It can be a regular shape or an irregular shape, such as a cylindrical groove with a rectangular, elliptical, or racetrack-shaped cross-section, a trapezoidal groove with a rectangular cross-section and gradually changing cross-sectional dimensions, a hemispherical groove with a circular cross-section and gradually changing cross-sectional dimensions, or a semi-ellipsoidal groove with an elliptical cross-section and gradually changing cross-sectional dimensions, etc. In the embodiments of this application, the third receiving groove 12140 can be constructed with a cross-sectional length greater than its width, such as a rectangle, ellipse, racetrack shape, etc., which is beneficial for accommodating the first gathering portion 2212.

[0426] In the third embodiment, the second gathering portion 2213 is directly or indirectly electrically connected to the first terminal 12. For example, when the second gathering portion 2213 is directly electrically connected to the first terminal 12, such as when the second gathering portion 2213 is welded to the first terminal 12, the structure of the battery cell assembly 2 can be simplified, the number of parts reduced, the assembly process simplified, and the assembly efficiency improved. The method and location of the direct electrical connection between the second gathering portion 2213 and the first terminal 12 are not limited. For example, the electrical connection position between the second gathering portion 2213 and the first pole post 12 can be located at the second end wall 12121 and / or the second side wall 12123. Further, the electrical connection position between the second gathering portion 2213 and the second end wall 12121 can extend along the length or width direction of the second end wall 12121. Further still, the second end wall 12121 has a second recess 12122, and the electrical connection position between the second gathering portion 2213 and the second end wall 12121 can be located within the second recess 12122, etc. The corresponding technical effects can be referred to the description of the above embodiments, and will not be repeated here.

[0427] As an optional solution, the conductive part 22 can also be equipped with an adapter piece 222 as needed, in which case the second retractable part 2213 is electrically connected to the first pole post 12. Specifically, Figure 49 For a partial cross-sectional view of the battery cell 10 provided in some embodiments of this application, please refer to... Figure 49When the conductive part 22 includes the adapter piece 222, the adapter piece 222 is connected to the second gathering part 2213, and the conductive part 22 is electrically connected to the first pole post 12 through the adapter piece 222. At this time, at least a portion of the adapter piece 222 is accommodated in the second receiving groove 12120. In this example, at least a portion of the second gathering part 2213 is also accommodated in the second receiving groove 12120.

[0428] In the above technical solution, the active material coating part 21 can be electrically connected to the first electrode post 12 through the first gathering part 2212, the second gathering part 2213, and the adapter piece 222 in sequence. The conductive part 22 is electrically connected to the first electrode post 12 at the position on the adapter piece 222. For example, the electrical connection can be achieved by welding the adapter piece 222 to the first electrode post 12 (e.g., laser welding). In addition, the adapter piece 222 and the tab piece 2211 are two separate components and are connected by welding (e.g., ultrasonic welding).

[0429] In the above technical solution, by accommodating at least a portion of the second gathering portion 2213 and at least a portion of the adapter piece 222 within the second receiving groove 12120, the space within the first electrode post 12 can be utilized more fully, further reducing the space occupied by the conductive portion 22 within the housing 11, thereby further improving the volumetric energy density of the battery cell 10. Furthermore, by providing the adapter piece 222 with a sheet structure, it is convenient for the adapter piece 222 to pass through the first through hole 12130 and extend into the second receiving groove 12120.

[0430] Furthermore, by using an adapter piece 222 to achieve an indirect electrical connection between the second gathering portion 2213 and the first terminal post 12, the adapter piece 222 can be welded to the first terminal post 12 using a portion that avoids the second gathering portion 2213, thereby making the weld between the adapter piece 222 and the first terminal post 12 more secure, reducing the risk of weld cracking, and further improving the reliability and stability of the battery cell 10; at the same time, by electrically connecting the first terminal post 12 and the tab 2211 through the adapter piece 222, the structure of the tab 2211 can also be simplified.

[0431] The method and location of the direct electrical connection between the adapter piece 222 and the first pole piece 12 are not limited. For example, the adapter piece 222 and the first pole piece 12 can be electrically connected by welding. For example, the electrical connection position between the adapter piece 222 and the first pole piece 12 can be located at the second end wall 12121 and / or the second side wall 12123. Further, the electrical connection position between the adapter piece 222 and the second end wall 12121 can extend along the length or width direction of the second end wall 12121. Further still, the second end wall 12121 has a second recess 12122, and the electrical connection position between the adapter piece 222 and the second end wall 12121 can be located within the second recess 12122, etc. The corresponding technical effects can be referred to the description of the above embodiments, and will not be repeated here. When the electrical connection position between the adapter piece 222 and the first pole post 12 is located at the second end wall 12121 and / or the second side wall 12123, since at least a portion of the adapter piece 222 is accommodated in the second receiving groove 12120, the structure of the adapter piece 222 can be simplified, redundancy can be reduced, and costs can be lowered.

[0432] Please refer to Figure 49 In the fourth embodiment, the active material coating portion 21 includes a current collector 211 and an active material layer 212 disposed on the current collector 211. The conductive portion 22 includes a tab portion 221 and an adapter piece 222. The tab portion 221 includes a plurality of tab pieces 2211 electrically connected to the current collector 211. The plurality of tab pieces 2211 converge near the current collector 211 to form a first gathering portion 2212, and the plurality of tab pieces 2211 converge and connect away from the current collector 211 to form a second gathering portion 2213. The adapter piece 222 is electrically connected to the second gathering portion 2213. When the receiving portion 121 has a second receiving groove 12120, at least a portion of the adapter piece 222 can be received in the second receiving groove 12120 and electrically connected to the first electrode post 12.

[0433] In the above technical solution, compared with the solution of the third embodiment that includes the adapter piece 222, in the fourth embodiment, at least a portion of the adapter piece 222 is accommodated in the second receiving groove 12120, but the relative position of the electrode tab 221 and the second receiving groove 12120 is not limited. That is, at least a portion of the electrode tab 221 can be accommodated in the second receiving groove 12120, or the electrode tab 221 can be completely located outside the second receiving groove 12120, thereby satisfying different structural design requirements.

[0434] In the above technical solution, by accommodating at least a portion of the adapter piece 222 in the second receiving groove 12120, the adapter piece 222 can occupy the space in the first electrode post 12, thereby reducing the space occupied by the adapter piece 222 in the housing 11 to accommodate a larger active material coating part 21, improving the energy density of the battery cell 10, and reducing the probability of short circuit between the adapter piece 222 and the active material coating part 21, reducing the risk of short circuit in the cell assembly 2, thereby improving the stability and reliability of the battery cell 10.

[0435] Furthermore, by using an adapter piece 222 to achieve an indirect electrical connection between the second gathering portion 2213 and the first terminal post 12, the adapter piece 222 can be welded to the first terminal post 12 using a portion that avoids the second gathering portion 2213, thereby making the weld between the adapter piece 222 and the first terminal post 12 more secure, reducing the risk of weld cracking, and further improving the reliability and stability of the battery cell 10; at the same time, by electrically connecting the first terminal post 12 and the tab 2211 through the adapter piece 222, the structure of the tab 2211 can also be simplified.

[0436] Figure 50 For a partial cross-sectional view of the battery cell 10 provided in some embodiments of this application, please refer to... Figure 50 In some other embodiments of this application, the receiving portion 121 has a fourth receiving groove 12150, which is a groove body with a certain depth. The surface of the first pole post 12 away from the active material coating portion 21 is the pole post outer end face 123. The groove opening of the fourth receiving groove 12150 is formed on the pole post outer end face 123. The fourth receiving groove 12150 is connected to the interior of the housing 11 through the second through hole 12160. The conductive portion 22 may not be contained in the fourth receiving groove 12150. For example, the conductive portion 22 may be inserted through the second through hole 12160, and the electrical connection position between the conductive portion 22 and the first pole post 12 is located on the hole wall of the second through hole 12160 formed by the first pole post 12.

[0437] In the above embodiments, by providing the fourth receiving groove 12150, the electrical connection between the conductive part 22 and the hole wall of the second perforation 12160 can be easily achieved. Furthermore, in some cases, the electrical connection between the conductive part 22 and the first electrode post 12 can be used to seal the second perforation 12160. For example, the conductive part 22 can be welded to the hole wall of the second perforation 12160 at the location where it connects to the fourth receiving groove 12150, which facilitates operation. Moreover, by controlling the solder joint, the solder joint and the conductive part 22 can be used to seal the second perforation 12160, thereby improving the problem of electrolyte leakage from the second perforation 12160 within the housing 11.

[0438] It should be noted that the specific shape of the fourth receiving groove 12150 is not limited. It can be a regular shape or an irregular shape, such as a cylindrical groove with a rectangular, elliptical, or racetrack-shaped cross section, or a trapezoidal groove with a rectangular cross section and gradually changing cross section size, or a hemispherical groove with a circular cross section and gradually changing cross section size, or a semi-ellipsoidal groove with an elliptical cross section and gradually changing cross section size, etc.

[0439] In the embodiments of this application, the second perforation 12160 can be elongated to match the sheet-like partial shape of the conductive part 22, thereby facilitating the passage of the sheet-like partial conductive part 22. Simultaneously, when the second perforation 12160 is elongated, the fourth receiving groove 12150 can also be constructed with a cross-sectional length greater than its width, such as a rectangle, ellipse, racetrack shape, etc. In this case, the length direction of the second perforation 12160 can be set to be consistent with the length direction of the cross-section of the fourth receiving groove 12150, thereby making full use of space.

[0440] It should be noted that the receiving portion 121 in this embodiment is not limited to the form described above, which requires at least one receiving groove. For example, in some other embodiments of this application, Figure 51 For a partial cross-sectional view of the battery cell 10 provided in some embodiments of this application, please refer to... Figure 51 The receiving portion 121 may only have a third through hole 12170. The surface of the first electrode 12 facing the active material coating portion 21 is the inner end face 122 of the electrode, and the surface of the first electrode 12 away from the active material coating portion 21 is the outer end face 123 of the electrode. The third through hole 12170 is a through hole and penetrates the inner end face 122 and the outer end face 123 of the electrode. At least a portion of the conductive portion 22 passes through the third through hole 12170. The electrical connection position between the conductive portion 22 and the first electrode 12 is not limited. For example, the electrical connection position may be located on the wall of the hole forming the third through hole 12170 of the first electrode 12, or the conductive portion 22 may also pass through the third through hole 12170 so that the electrical connection position is located on the outer end face 123 of the electrode outside the third through hole 12170, etc. Furthermore, the shape of the third through hole 12170 is not limited; it may be a regular shape hole with a uniform cross-section, or a variable cross-section hole, etc. Furthermore, the cross-sectional shape of the third perforation 12170 is not limited. For example, it can be a long strip shape, such as a rectangle, an ellipse, or a racetrack shape, etc., to match the sheet-like partial shape of the conductive part 22, thereby facilitating the sheet-like partial penetration of the conductive part 22 into the third perforation 12170. This will not be elaborated here.

[0441] That is, it should be noted that in the embodiments of this application, regardless of the structure of the conductive part 22, when the conductive part 22 only includes the tab structure, the second welding surface 220 is the upper surface of the second gathering part 2213 near the first pole post 22, and when the conductive part 22 includes the adapter piece 222, the second welding surface 220 is the upper surface of the adapter piece 222 near the pole post 22.

[0442] Figure 52 A partial cross-sectional schematic diagram of a battery cell provided in some embodiments of this application; Figure 53 This is a schematic diagram illustrating the interaction between the battery cell assembly and the support frame according to some embodiments of this application; Figure 54 for Figure 53 A sectional view along the CC line, combined with Figures 52-54 In the embodiments of this application, the battery cell 10 further includes a support 3, which is located inside the housing 11 and on the side of the active material coating portion 21 near the first electrode post 12. The support 3 has a clearance hole 31 for avoiding the conductive portion 22. The conductive portion 22 can pass through the clearance hole 31 and extend to the side of the support 3 away from the active material coating portion 21 to be welded to the first electrode post 12, thereby ensuring the normal operation of the charging and discharging of the battery cell 10.

[0443] In the above technical solution, by providing a support 3 on the side of the active material coating part 21 near the first electrode post 12, the active material coating part 21 can be separated from the housing 11 by the support 3, thereby improving the reliability of the battery cell 10. Furthermore, by providing a clearance hole 31 on the support 3, the conductive part 22 can be guided and constrained to cooperate with the first electrode post 12 by passing through the clearance hole 31, so that the conductive part 22 does not need to go around the edge of the support 3 to approach the first electrode post 12. This not only simplifies the arrangement of the conductive part 22, saves the material of the conductive part 22, and reduces costs, but also reduces the risk of short circuit between the conductive part 22 and the active material coating part 21 by supporting and guiding the conductive part 22 to cooperate with the first electrode post 12 through the support 3, thereby further improving the reliability of the battery cell 10.

[0444] Please refer to this again. Figures 52-54 Optionally, the bracket 3 is provided with a guide portion 32, which surrounds at least a portion forming the clearance hole 31, and the guide portion 32 extends at least partially into the receiving portion 121.

[0445] It is worth noting that the guide portion 32 protrudes from the bracket 3 and extends into the receiving portion 121. At least a portion of the clearance hole 31 is formed in the guide portion 32, so that when the conductive portion 22 passes through the clearance hole 31, at least a portion of the conductive portion 22 can be easily housed in the receiving portion 121, thereby improving the assembly efficiency of the conductive portion 22. At the same time, the arrangement of the guide portion 32 makes the fit between the bracket 3 and the first pole post 12, and between the bracket 3 and the conductive portion 22, tighter and more reliable, making the structure of the battery cell 10 more compact and more conducive to improving the energy density of the battery cell 10.

[0446] Please refer to this again. Figures 52-54 Optionally, the bracket 3 is provided with a third groove 38, and at least part of the first pole post 12 located in the housing 11 is accommodated in the third groove 38.

[0447] In the above technical solution, by setting a third groove 38 on the bracket 3, at least a portion of the first pole post 12 located inside the housing 11 is housed in the third groove 38 of the bracket 3, thereby improving the compactness of the structure, reducing the space occupied by the bracket 3 inside the housing 11, and improving the volumetric energy density of the battery cell 10.

[0448] Furthermore, in some embodiments, the guide portion 32 can be used to define the third groove 38, thereby simplifying the structure of the bracket 3, reducing the design and processing difficulty of the bracket 3, and facilitating an increase in the wall thickness of the guide portion 32, thus improving the guiding reliability of the conductive portion 32. It also helps to improve the stability and reliability of the first electrode post 12, ensuring the reliability and stability of the electrical connection between the first electrode post 12 and the cell assembly 2, thereby improving the reliability and stability of the charging and discharging operation of the battery cell 10.

[0449] Please refer to this again. Figures 52-54 Optionally, in an embodiment of this application, the clearance hole 31 includes a first hole segment 311 and a second hole segment 312. The second hole segment 312 is located on the side of the first hole segment 311 near the active material coating portion 21, and the cross-sectional area of the second hole segment 312 gradually increases along the direction away from the first hole segment 311. The active material coating portion 21 includes a current collector 211 and an active material layer 212 disposed on the current collector 211. The conductive portion 22 includes an electrode portion 221 electrically connected to the current collector 211. The ear portion 221 includes a plurality of tabs 2211. The plurality of tabs 2211 converge near the current collector 211 to form a first gathering portion 2212. The plurality of tabs 2211 converge away from the current collector 211 and connect to form a second gathering portion 2213. The first gathering portion 2212 connects the second gathering portion 2213 and the active material coating portion 21. At least a portion of the first gathering portion 2212 is accommodated in the second hole segment 312. The second gathering portion 2213 passes through the first hole segment 311.

[0450] In the above technical solution, by setting the clearance hole 31 to include a second hole segment 312 that gradually expands in the direction towards the active material coating portion 21, the second hole segment 312 can accommodate more of the first gathering portion 2212, improving the compactness of the fit between the bracket 3 and the cell assembly 2, so that the overall volume of the battery cell 10 is smaller, and the battery 100 can accommodate more battery cells 10, thereby improving the volumetric energy density of the battery 100. Furthermore, the specific explanations of the first gathering portion 2212 and the second gathering portion 2213 in the above technical solution have been described in the preceding embodiments and will not be repeated here.

[0451] In some embodiments of this application, the support 3 is an integral structure, or it can be a separate structure. Figure 55 For a schematic diagram of the integrated bracket 3 provided in some embodiments of this application, please refer to... Figure 55 When the bracket 3 is a one-piece structure, the clearance hole 31 is formed as a through hole penetrating the bracket 3. Therefore, the one-piece structure of the bracket 3 is easier to manufacture, has better reliability, and facilitates assembly between the bracket 3 and the housing assembly 1, improving assembly efficiency and fit stability. It is understandable that the manufacturing process of the bracket 3 can be selected based on its material. For example, when the bracket 3 is an insulating plastic part, an injection molding process can be used to obtain a one-piece structure.

[0452] Figure 56 For structural schematic diagrams of the split-type support 3 provided in some embodiments of this application, please refer to... Figure 56 When the bracket 3 is a split structure, it includes a detachable first bracket 33 and a second bracket 34. Both the first bracket 33 and the second bracket 34 are elongated plate-like structures that can be detachably connected, for example, by plugging or snapping them together for easy assembly. Simultaneously, the first bracket 33 has a semi-hole structure on the side near the second bracket 34, and the second bracket 34 also has a correspondingly shaped semi-hole structure near the first bracket 33. The semi-hole structures of the first bracket 33 and the second bracket 34 together form an annular clearance hole 31. That is, the clearance hole 31 defines a space between the first bracket 33 and the second bracket 34.

[0453] In the above technical solution, the clearance hole 31 is defined by the cooperation of the first bracket 33 and the second bracket 34. When the bracket 3 is assembled with the battery cell assembly 2, it is not necessary to pass the conductive part 22 from one end of the clearance hole 31 to the other end. Instead, the first bracket 33 and the second bracket 34 can be spliced together at the position of the conductive part 22 to clamp the conductive part 22, so that the clearance hole 31 surrounds the conductive part 22, thereby facilitating the assembly of the bracket 3 with the battery cell assembly 2 and improving the assembly efficiency.

[0454] As an optional solution, when the cross-section of the clearance hole 31 is elongated, the first bracket 33 and the second bracket 34 are placed on both sides of the width direction of the clearance hole 31. For example, if the width direction of the clearance hole 31 is left and right, the first bracket 33 and the second bracket 34 are located on the left and right sides of the clearance hole 31, which facilitates the cooperation between the first bracket 33, the second bracket 34 and the conductive part 22.

[0455] Figure 57 A partial cross-sectional schematic diagram of the cell assembly 2 and the bracket 3 provided in some embodiments of this application; Figure 58 For exploded views of the cell assembly 2, bracket 3, and housing assembly 1 provided in some embodiments of this application, please refer to... Figure 52 , Figure 57 and Figure 58 In the embodiments of this application, the structure of the bracket 3 is not limited to this. For example, the edge of the bracket 3 can also be provided with an insertion guide surface 35. The insertion guide surface 35 can be an inclined surface or a curved surface, and when projected orthogonally along the axial direction R of the first pole post 12, the orthogonal projection of the active material coating part 21 is entirely within the orthogonal projection range of the bracket 3, and the orthogonal projection range of the bracket 3 exceeds the orthogonal projection range of the active material coating part 21. During assembly, the bracket 3 can be pre-assembled with the cell assembly 2, and then this pre-assembled assembly can be installed into the housing 11. When installed, the bracket 3 is located at the front end of the active material coating part 21, that is, the bracket 3 enters the housing 11 before the active material coating part 21. Thus, the insertion guide surface 35 can be used to reduce the difficulty of the bracket 3 entering the housing 11, and the relatively large projection area of the bracket 3 can be used to protect the active material coating part 21, reduce the probability of scratch damage between the active material coating part 21 and the housing 11, and improve assembly efficiency and success rate. Moreover, the contact area between the bracket 3 and the active material coating part 21 can be increased, which can reduce stress concentration problems and eliminate the need for other structural components.

[0456] Please refer to Figure 57 In embodiments of this application, the battery cell 10 may further include an inner insulating member 4, which is located inside the housing 11 and wraps around the active material coating portion 21, and is connected to the support 3. In the above embodiments, on the one hand, by wrapping the active material coating portion 21 with the inner insulating member 4, the insulation reliability between the active material coating portion 21 and the housing 11 can be improved, reducing or preventing the contact between the active material coating portion 21 and the housing 11 from causing corrosion of the housing 11, reducing electrolyte leakage caused by corrosion of the housing 11, thereby improving the reliability of the battery cell 10; on the other hand, by connecting the inner insulating member 4 to the support 3, the difficulty of fixing the inner insulating member 4 can be reduced, and the reliability of the inner insulating member 4 wrapping around the active material coating portion 21 can be improved.

[0457] Please refer to Figure 57In the embodiments of this application, the support 3 includes a body portion 36 and an extension portion 37. The body portion 36 is located on the side of the active material coating portion 21 near the first pole post 12. The extension portion 37 is connected to the body portion 36 and located in the outer peripheral region of the active material coating portion 21. For example, the extension portion 37 can be connected to the circumferential edge of the body portion 36 to form an annular extension structure connected to the body portion 36, or it can be a partial circumferential extension of the body portion 36 to form a block structure protruding relative to the body portion 36. On the one hand, the extension portion 37 can limit the fit of the active material coating portion 21 to improve the problem of corrosion caused by the carbon powder falling off the edge of the active material coating portion 21 overlapping with the shell 11. On the other hand, the extension portion 37 can also fix the inner insulating member 4, improve the connection reliability between the inner insulating member 4 and the support 3, and has a better insulation effect.

[0458] For example, please refer to Figure 57 The main body 36 and the extension 37 can define a positioning groove 39 on the side of the extension 37 away from the active material coating part 21. The end of the inner insulating member 4 is embedded in the positioning groove 39 to prevent the inner insulating member 4 from protruding from the edge of the main body 36. In this way, when the inner insulating member 4 is inserted into the shell, the main body 36 can be used to protect the inner insulating member 4, reducing the chance of the inner insulating member 4 being scratched and damaged by the shell 11.

[0459] Specifically, please refer to Figure 28 The inner insulating member 4 can be an integral film, having a main body 41 located on both sides of the active material coating part 21 in the thickness direction and a connecting part 42 connecting the two main body parts 41. The connecting part 42 is located on the side of the active material coating part 21 away from the first pole post 12. The edge of the side of the main body part 41 away from the connecting part 42 extends to the extension part 37 and connects with the extension part 37, thereby having better insulation performance and being easy to connect.

[0460] In the embodiments of this application, the specific method of setting the first pole post 12 on the housing 11 is not limited, such as riveting or welding, which will be described below.

[0461] For example, in some embodiments Figure 59 Exploded views of the structure of the first pole post 12, housing 11, and insulating sealing component 8 provided in some embodiments of this application; Figure 60 for Figure 59 The assembly diagram shown is of the first pole post 12, the housing 11, and the insulating sealing component 8. Figure 61 This is a schematic diagram of the structure of the first pole post 12 provided in some embodiments of this application, combined with... Figures 59-61The first pole post 12 can be an integral structure and riveted to the housing 11, which can improve the assembly efficiency of the first pole post 12, reduce the height of the first pole post 12 protruding from the surface of the housing 11, which is beneficial to improving energy density and compactness.

[0462] Specifically, please refer to Figures 59-61 Before riveting, the first pole post 12 may include a stop portion 1281 and a through portion 1282. During assembly, the stop portion 1281 is stopped inside the housing 11, and the through portion 1282 passes through the mounting hole 113. Then, the portion of the through portion 1282 located outside the housing 11 is riveted to form a flange portion 1283. The flange portion 1283 stops outside the housing 11, thereby realizing the installation of the first pole post 12. At this time, the stop portion 1281 can be formed as a second limiting platform 12c, the portion of the through portion 1282 that cooperates with the mounting hole 113 can be formed as the pole post body 12a, and the flange portion 1283 can be formed with a first limiting platform 12b.

[0463] Alternatively, please refer to Figure 60 The length x of the flange 1283 can be greater than or equal to 1 mm, and the thickness t1 can be greater than or equal to 2 mm, in order to improve the riveting strength of the first pole post 12. When the length x of the flange 1283 is less than 1 mm and / or the thickness t1 is less than 2 mm, the reliability of the first pole post 12 and the housing 11 is reduced under relatively strong vibration.

[0464] In some alternative embodiments, please refer to Figures 9-19 The first pole post 12 with the receiving part 121 is multiple and all located on the same side surface of the housing 11, thereby facilitating installation and improving assembly efficiency.

[0465] It should be noted that the arrangement of the multiple first pole posts 12 on the same side surface is not limited. For example, when the cross-section of the first pole post 12 is a slender structure, such as a cross-sectional length greater than or equal to three times the cross-sectional width, such as an ellipse, racetrack shape, or rectangle, it has good adaptability to the thin and flat shell 11. For example, multiple first pole posts 12 are all provided on one side wall (denoted as the first wall 110) in the height direction of the shell 11, and the length direction of each first pole post 12 is consistent with the length direction of the first wall 110 of the shell 11, and the multiple first pole posts 12 are spaced apart along the length direction and / or width direction of the first wall 110.

[0466] For example in Figures 9-14In the example, when the first wall 110 has two first poles 12, the two first poles 12 are spaced apart along the length direction of the first wall 110. Optionally, the portion of the first pole 12 outside the housing 11 (denoted as the pole exterior, which includes the first limiting platform 12b, or the pole exterior includes the portion of the pole body 12a outside the housing 11 and the first limiting platform 12b) is annular. In the length direction of the first wall 110, the inner ring length a1 of the pole exterior is greater than or equal to 1 / 3 of the length a0 of the first wall 110, and in the width direction of the first wall 110, the inner ring width b1 of the pole exterior is greater than or equal to 3 / 4 of the width b0 of the first wall 110. This allows the first pole 12 to provide a larger area for electrical connection with the busbar component, thereby further improving the current carrying capacity of the first pole 12. For example, the inner ring length a1 of the pole exterior is greater than or equal to 50 mm, and the inner ring width b1 of the pole exterior is greater than or equal to 30 mm.

[0467] Additionally, please refer to Figures 9-14 When the first wall 110 has two first poles 12, and the two first poles 12 are spaced apart along the length direction of the first wall 110, in some optional embodiments, the first pole 12 includes a portion located inside the housing 11 (denoted as the pole interior, which includes a second limiting platform 12c, or the pole interior includes the portion of the pole body 12a located inside the housing 11 and the second limiting platform 12c). In the length direction of the first wall 110, the length of the pole interior is greater than or equal to 1 / 3 of the length of the first wall 110, and in the width direction of the first wall 110, the width of the pole interior is greater than or equal to 3 / 4 of the width of the first wall 110. This allows the first pole 12 to provide a larger area for electrical connection with the conductive part 22, thereby further improving the current-carrying capacity of the first pole 12. For example, the length of the pole interior is greater than or equal to 50 mm, and the width of the pole interior is greater than or equal to 30 mm.

[0468] For example, when the first wall 110 has four first poles 12, two first poles 12 are spaced apart along the width direction of the first wall 110 to form a group, and a total of two groups are spaced apart along the length direction of the first wall 110. Optionally, the portion of the first pole 12 outside the housing 11 (denoted as the pole exterior, which may include the first limiting platform 12b) is annular. In the length direction of the first wall 110, the inner ring length a2 of the pole exterior is greater than or equal to 1 / 3 of the length a0 of the first wall 110, and in the width direction of the first wall 110, the inner ring width b2 of the pole exterior is greater than or equal to 1 / 5 of the width b0 of the first wall 110. This allows the first pole 12 to provide a larger area for electrical connection with the busbar component, thereby further improving the current carrying capacity of the first pole 12. For example, the inner ring length a2 of the pole exterior is greater than or equal to 50 mm, and the inner ring width b2 of the pole exterior is greater than or equal to 8 mm.

[0469] Furthermore, when the first wall 110 has four first poles 12, wherein two first poles 12 are spaced apart along the width direction of the first wall 110 to form a group, and a total of two groups are spaced apart along the length direction of the first wall 110, in some optional embodiments, the first pole 12 includes a portion located inside the housing 11 (denoted as the pole interior). In the length direction of the first wall 110, the length of the pole interior is greater than or equal to 1 / 3 of the length of the first wall 110, and in the width direction of the first wall 110, the width of the pole interior is greater than or equal to 1 / 5 of the width of the first wall 110. This allows the first pole 12 to provide a larger area for electrical connection with the conductive part 22, thereby further improving the current-carrying capacity of the first pole 12. For example, the length of the pole interior is greater than or equal to 50 mm, and the width of the pole interior is greater than or equal to 8 mm.

[0470] In some embodiments, please refer to Figure 8 A portion of the first terminal 12 is located inside the housing 11, while another portion is located outside the housing 11. The projected area of the portion of the first terminal 12 outside the housing 11 on the first wall 110 is greater than or equal to 5% of the area of the first wall 110. For example, the projected area of the portion of the first terminal 12 outside the housing 11 on the first wall 110 is greater than or equal to 5%, 6%, 7%, 8%, 9%, 10%, etc., of the area of the first wall 110. This is beneficial for increasing the connection area between the first terminal 12 and the current collector, increasing the effective current flow area between the first terminal 12 and the current collector, and improving the charging speed of the battery cell 10.

[0471] Furthermore, in some embodiments... Figure 62 For cross-sectional schematic diagrams of the housing assembly provided in some embodiments of this application, please refer to... Figure 62 The vertical height T1 of the portion of the first electrode post 12 protruding from the outer surface of the first wall 110 (referred to as the electrode post exterior) from the first wall 110 can be less than or equal to 3.2 mm, and the vertical height T2 of the portion of the first electrode post 12 protruding from the inner surface of the first wall 110 (referred to as the electrode post interior) from the first wall 110 can be less than or equal to 2 mm, so as to improve the volumetric energy density of the battery cell 10.

[0472] Figure 63 A cross-sectional schematic diagram of a housing assembly provided for some embodiments of this application; Figure 64 Orthographic projection views of a battery cell provided in some embodiments of this application; Figure 65 for Figure 64 A sectional view along the EE line; Figure 66 Partial cross-sectional schematic diagrams of battery cells provided in some embodiments of this application; please refer to Figures 62 to 66In the embodiments of this application, the shell 11 specifically includes a shell body 111 and a shell cover 112. The shell body 111 is a square ring structure with one or both ends open. When one end is open, there is one shell cover 112, which is placed in the open position. When both ends are open, there are two shell covers 112, which are respectively placed in the open ends of the shell body 111.

[0473] In detail, when the housing 11 includes a body 111 and a cover 112, and one end of the body 111 is open, the body 111 is a one-piece molded part, specifically a square structure formed by stretching. In this case, the first pole post 12 can be disposed on at least one of the body 111 or the cover 112. For example, please refer to Figure 62 The first terminal 12 can be specifically located at the end of the housing 111 away from the cover 112. When the battery cell 10 is used in a vibration environment, the amplitude at the connection between the housing 111 and the cover 112 is small, and the connection between the housing 111 and the cover 112 is less prone to cracking. This can improve the reliability of the battery cell 10 and help reduce the wall thickness of the housing 111, thereby reducing costs and weight, and facilitating the miniaturization of the battery cell 10.

[0474] As an optional option, please refer to [the relevant documentation / reference]. Figure 62 When there are multiple first terminals 12, all first terminals 12 are located at the end of the housing 111 furthest from the cover 112. Therefore, when the battery cell 10 is used in a vibrating environment, the amplitude of vibration at the connection between the housing 111 and the cover 112 is smaller, and the connection is less prone to cracking, thus improving the reliability of the battery cell 10. Furthermore, the wall thickness e1 of the end wall of the housing 111 furthest from the cover 112 can be reduced to less than or equal to 2 mm, and the wall thickness e2 of the side wall connecting the end wall of the housing 111 to the cover 112 can be reduced to less than or equal to 0.8 mm, thereby reducing cost and weight, and facilitating the miniaturization of the battery cell 10.

[0475] When the first receiving groove 12110 corresponding to the mounting hole 113 is opened on the first electrode post 12, the wall thickness of the portion of the first electrode post 12 located in the first receiving groove 12110 away from the active material coating portion 21 is thinner, thereby enabling welding of the conductive portion 22 to the first electrode post 12 from the outside of the housing 11. Please refer to... Figure 62As shown, the housing 11 includes a body 111 and a cover 112. The cover 112 is located at the open end of the body 111. Even if the first electrode 12 is located at the closed end of the body 111, there is no need to worry about the difficulty of welding the conductive part 22 to the first electrode 12 from the inside of the housing 11. This is because the conductive part 22 can be welded to the first electrode 12 from the outside of the housing 11. Thus, by placing the first electrode 12 at the closed end of the body 111, the connection stability and reliability between the body 111 and the cover 112 can be improved.

[0476] When the second receiving groove 12120 is formed on the first electrode post 12, the conductive part 22 and the first electrode post 12 can be welded from the outside of the housing 11 through the opening of the second receiving groove 12120. Please refer to... Figure 62 As shown, the housing 11 includes a body 111 and a cover 112. The cover 112 is located at the open end of the body 111. Even if the first electrode 12 is located at the closed end of the body 111, there is no need to worry about the difficulty of welding the conductive part 22 to the first electrode 12 from the inside of the housing 11. This is because the conductive part 22 can be welded to the first electrode 12 from the outside of the housing 11. Thus, by placing the first electrode 12 at the closed end of the body 111, the connection stability and reliability between the body 111 and the cover 112 can be improved.

[0477] Of course, please refer to Figure 63 In other embodiments of this application, all the first pole posts 12 may be disposed on the housing cover 112 as needed. This facilitates the assembly of the first pole posts 12 with the housing cover 112, and this embodiment does not limit this.

[0478] Additionally, please refer to Figures 64-66 In the embodiments of this application, when there are multiple first pole posts 12 with receiving portions 121, the first pole posts 12 can also be placed on two surfaces of different sides of the housing 11. For example, there are multiple first pole posts 12 with receiving portions 121 and they are placed on adjacent two side surfaces of the housing 11, or, for example, there are multiple first pole posts 12 with receiving portions 121 and they are placed on opposite two side surfaces of the housing 11.

[0479] When the opposite two sides of the housing 11 are respectively provided with first electrode posts 12 having receiving portions 121, conductive portions 22 can extend from the active material coating portion 21 near the first electrode post 12 on each side. The conductive portions 22 cooperate and connect with the first electrode post 12 on the adjacent side, thereby improving the problem of the tab portion 221 being pulled by the first electrode post 12 on the same side, causing the connection between the tab portion 221 and the active material coating portion 21 to crack, thus improving the reliability of the battery cell 10. It is worth noting that the first electrode posts 12 on both sides can be the same or different, and the connection method between the first electrode posts 12 on both sides and the conductive portions 22 can be the same or different, which is not limited here.

[0480] Of course, in other embodiments of this application, the first electrode post 12 may also be disposed on the surface of the housing 11 with the largest area. For example, in some optional embodiments of this application, the first electrode post 12 may be located on the top surface of the housing 11. For yet another example, in some optional embodiments of this application, the first electrode post 12 may be located on the bottom surface of the housing 11, and so on. When the first electrode post 12 is located on the bottom surface of the housing 11, the receiving portion 121 can be used to contain the electrolyte, thereby improving the cycle life of the battery cell 10. Furthermore, when the first electrode post 12 is located on the bottom surface of the housing 11, and the support 3 is located at the bottom of the active material coating portion 21, the contact area between the support 3 and the active material coating portion 21 can be increased, thereby reducing stress concentration problems and eliminating the need for other supporting structural components.

[0481] Figure 70 This is a schematic diagram of the structure of the shell cover 112 provided in some embodiments of this application, combined with... Figure 27 and Figure 70 In the embodiments of this application, the housing 11 has a pressure relief section 16. The specific configuration of the pressure relief section 16 is not limited, for example, it can be an explosion-proof valve or a weak point, etc., and can be used to relieve pressure when the pressure inside the battery cell 10 is high, so as to improve the reliability of the battery cell 10.

[0482] Optionally, the pressure relief section 16 and the first pole post 12 are located on the same side surface of the housing 11. This facilitates processing and assembly. Alternatively, the pressure relief section 16 and the first pole post 12 can also be placed on opposite sides of the housing 11. This saves space, increases the volume of the first pole post 12, and reduces the adverse effects of the pressure relief section 16 on the first pole post 12 when it relieves pressure.

[0483] Please refer to this again. Figure 62 and Figure 70In the embodiments of this application, the pressure relief part 16 can also be provided on the cover 112 as needed. Since the cover 112 does not need to bear the function of installing the first terminal post 12, and the connection position between the cover 112 and the housing 11 is less affected by vibration during the charging and discharging of the battery cell 10, it is not easy to crack. Therefore, the thickness of the cover 112 can be set relatively thin, which makes it easier to process and manufacture the pressure relief part 16. For example, it is easy to form the pressure relief part 16 directly on the cover 112 by integral engraving, so as to fully improve the manufacturability of the battery cell 10. It is worth noting that in this embodiment, the first terminal post 12 can be provided on the housing 111 or the cover 112, which is not limited here. For example, the pressure relief part 16 can be integrally formed with the cover 112, thereby facilitating processing, simplifying assembly, improving production efficiency, and reducing costs.

[0484] Please refer to Figure 6 and Figure 8 Optionally, in the embodiments of this application, along the direction perpendicular to the projection plane Ω, the ratio of the projected area of the welded part 9 on the projection plane Ω to the projected area of the first wall 110 on the projection plane Ω is within the range of 0.1% to 1%. For example, the ratio of the projected area of the welded part 9 on the projection plane Ω to the projected area of the first wall 110 on the projection plane Ω is 0.1%, 0.2%, 0.4%, 0.5%, 0.8%, or 1%, etc.

[0485] If the projection direction in the above conditions is parallel to the axial direction of the mounting hole 113, then the projected area of the welded part 9 on the projection surface can be understood as the projected area of the connection area between the conductive part 22 and the first electrode 12 on the projection surface. Therefore, the projected area of the welded part 9 on the projection surface can reflect the size of the connection area between the conductive part 22 and the first electrode 12. If the projected area of the welded part 9 on the projection surface satisfies the above conditions, then to a certain extent, the equivalent resistance between the conductive part 22 and the first electrode 12 can be reduced, the current-carrying area of the first electrode 12 can be increased, and the current-carrying capacity of the first electrode 12 can be improved, which is conducive to improving the charging speed of the battery cell 10 and improving the fast charging performance of the battery cell 10.

[0486] Please refer to Figure 6 and Figure 8 In the embodiments of this application, the projected area of the second welding surface 220 on the projection surface Ω is greater than or equal to 3% of the total area of the projected area of the first wall 110 on the projection surface Ω; the projected area of the first welding surface 120 on the projection surface Ω is greater than or equal to 25% of the total area of the projected area of the first wall 110 on the projection surface Ω. Of course, only one of the above two conditions may be satisfied, and the embodiments of this application do not limit this.

[0487] For example, the projected area of the second welding surface 220 on the projection surface Ω accounts for 3%, 3.5%, 4%, 4.4%, 5% of the total projected area of the first wall 110 on the projection surface Ω; the projected area of the first welding surface 120 on the projection surface Ω accounts for 25%, 25.4%, 25.8%, 26%, 26.5% of the total projected area of the first wall 110 on the projection surface Ω.

[0488] In the above technical...

Claims

1. A battery cell, wherein, include: A housing assembly includes a housing and a first pole post, the housing having a first wall having a mounting hole formed therein, the first pole post being disposed in the mounting hole, the first pole post including a first welding surface; A battery cell assembly includes an active material coating portion and a conductive portion electrically connected to the active material coating portion. The active material coating portion is housed within a housing. The conductive portion includes a second welding surface that contacts a first welding surface. A portion of the second welding surface is welded to a portion of the first welding surface via the welding portion. Wherein, taking the plane where the cross-section of the mounting hole is located as the projection plane, along the direction perpendicular to the projection plane, the outer contour of the projection of the second welding surface on the projection plane is within the range of the outer contour of the projection of the first welding surface on the projection plane; Also includes: A support is located inside the housing and on the side of the active material coating portion closer to the first electrode post. The support has a clearance hole for avoiding the conductive portion, and the conductive portion is adapted to extend through the clearance hole to the side of the support away from the active material coating portion. An inner insulating component, which is located inside the housing and wraps around the active material coating portion, and is connected to the support; The support includes a body and an extension. The body is located on the side of the active material coating portion near the first pole post, and the extension is connected to the body and located in the outer peripheral region of the active material coating portion. The extension has a positioning groove on the side away from the active substance coating portion, and the end of the inner insulating member is embedded in the positioning groove. Along the thickness direction of the inner insulating member, the inner insulating member does not protrude from the body portion.

2. The battery cell according to claim 1, wherein, The first pole post includes a pole post body, a first limiting platform and a second limiting platform. The pole post body passes through the mounting hole. The first limiting platform and the second limiting platform are arranged at both ends of the pole post body in a direction perpendicular to the projection plane. The first limiting platform is limited and fitted to the outside of the housing, and the second limiting platform is limited and fitted to the inside of the housing. The second limiting platform forms the first welding surface near the end face of the battery cell assembly.

3. The battery cell according to claim 2, wherein, The length of the pole body in the first direction is greater than or equal to 1 / 3 of the length of the first wall in the first direction; and / or, The width of the pole body in the second direction is greater than or equal to half the width of the first wall in the second direction; and / or, The ratio of the circumference of the pole body that mates with the mounting hole to the circumference of the first wall is within the range of 25% to 40%; and / or, The cross-sectional area of the portion of the pole body that mates with the mounting hole is greater than or equal to 10% of the area of the first wall; and / or, Along the axial direction of the mounting hole, the ratio of the thickness of the pole body to the thickness of the first wall is greater than 1 and less than 1.

5.

4. The battery cell according to claim 2, wherein, The ratio of the length of the first limiting platform in the first direction to the length of the first wall in the first direction is within the range of 1 / 3 to 1 / 2; and / or, The ratio of the width of the first limiting platform in the second direction to the width of the first wall in the second direction is within the range of 1 / 2 to 3 / 4; and / or, The first limiting platform is columnar, and the ratio of the perimeter of the first limiting platform to the perimeter of the first wall is within the range of 30% to 50%; and / or, The ratio of the cross-sectional area of the first limiting platform to the area of the first wall is within the range of 9% to 25%; and / or, Along the axial direction of the mounting hole, the ratio of the thickness of the first limiting platform to the thickness of the first wall is in the range of 0.6 to 1.

5.

5. The battery cell according to claim 2, wherein, The ratio of the length of the second limiting platform in the first direction to the length of the first wall in the first direction is within the range of 1 / 3 to 1 / 2; and / or, The ratio of the width of the second limiting platform in the second direction to the width of the first wall in the second direction is within the range of 1 / 2 to 3 / 4; and / or, The second limiting platform is columnar, and the ratio of the perimeter of the second limiting platform to the perimeter of the first wall is within the range of 30% to 50%; and / or, The ratio of the cross-sectional area of the second limiting platform to the area of the first wall is within the range of 9% to 25%; and / or, Along the axial direction of the mounting hole, the ratio of the thickness of the second limiting platform to the thickness of the first wall is in the range of 0.6 to 1.

5.

6. The battery cell according to claim 1, wherein, The conductive part includes a plurality of tabs connected to the active material coating part. The ends of the plurality of tabs near the active material coating part are gathered together to form a first gathered part, and the ends of the plurality of tabs away from the active material coating part are gathered together and connected to form a second gathered part. The first gathered part connects the second gathered part and the active material coating part, and the end face of the second gathered part near the first electrode post forms a second welding surface.

7. The battery cell according to claim 6, wherein, Using the plane containing the cross-section of the mounting hole as the projection plane, at least a portion of the outer contour of the projection of the first gathering portion on the projection plane is located within the range of the outer contour of the projection of the first welding surface on the projection plane along a direction perpendicular to the projection plane.

8. The battery cell according to claim 1, wherein, The conductive part includes a plurality of tabs connected to the active material coating part, and an adapter piece; the plurality of tabs are gathered together at one end near the active material coating part to form a first gathered part, the plurality of tabs are gathered together at the other end away from the active material coating part and connected to form a second gathered part, the first gathered part connects the second gathered part and the active material coating part, the adapter piece connects the second gathered part and the first electrode post, and a portion of the end face of the adapter piece near the first electrode post forms a second welding surface.

9. The battery cell according to claim 8, wherein, With the plane containing the cross-section of the mounting hole as the projection plane, at least a portion of the outer contour of the projection of the second gathering part on the projection plane is located within the range of the outer contour of the projection of the first welding surface on the projection plane along a direction perpendicular to the projection plane. And / or, Using the plane containing the cross-section of the mounting hole as the projection plane, at least a portion of the outer contour of the projection of the first gathering portion on the projection plane is located within the range of the outer contour of the projection of the first welding surface on the projection plane along a direction perpendicular to the projection plane.

10. The battery cell according to any one of claims 1-9, wherein, The first electrode post is provided with a receiving portion, and at least a portion of the conductive portion is received within the receiving portion.

11. The battery cell according to claim 10, wherein, The receiving portion has a first receiving groove, the surface of the first electrode post facing the active material coating portion is the inner end face of the electrode post, the groove opening of the first receiving groove is formed on the inner end face of the electrode post, and at least a portion of the conductive portion is received in the first receiving groove.

12. The battery cell according to claim 11, wherein, The first receiving tank has a first sink groove in its wall, and the conductive part is electrically connected to the first pole at least partially within the first sink groove.

13. The battery cell according to claim 11, wherein, The first electrode post has a first groove, and the side surface of the first electrode post away from the active material coating part is the outer end face of the electrode post, and the groove opening of the first groove is formed on the outer end face of the electrode post.

14. The battery cell according to claim 13, wherein, The battery cell also includes a slot cover, which is disposed on the first electrode post and seals the opening of the first groove.

15. The battery cell according to claim 10, wherein, The receiving portion has a second receiving groove. The surface of the first electrode post away from the active material coating portion is the outer end face of the electrode post. The opening of the second receiving groove is formed on the outer end face of the electrode post. The second receiving groove communicates with the interior of the housing through a first through hole. The conductive portion passes through the first through hole and is at least partially received in the second receiving groove.

16. The battery cell according to claim 15, wherein, The second receiving tank has a second sink, and the position where the conductive part is electrically connected to the first pole is at least partially located within the second sink.

17. The battery cell according to claim 15, wherein, The housing assembly further includes a first cover plate, which cooperates with the first pole post and closes the opening of the second receiving groove. The first cover plate is electrically connected to the first pole post.

18. The battery cell according to claim 15, wherein, The housing assembly further includes a second cover plate that covers the first perforation and the conductive portion located within the second receiving groove.

19. The battery cell according to claim 10, wherein, The bracket is provided with a guide portion that surrounds at least a portion forming the clearance hole and extends at least partially into the receiving portion.

20. The battery cell according to claim 10, wherein, The clearance hole includes a first hole segment and a second hole segment. The second hole segment is located on the side of the first hole segment near the active material coating portion, and the cross-sectional area of the second hole segment gradually increases in the direction away from the first hole segment. The active material coating portion includes a current collector and an active material layer disposed on the current collector. The conductive portion includes an electrode portion electrically connected to the current collector. The electrode portion includes a plurality of electrode tabs. The plurality of electrode tabs converge near the current collector to form a first convergence portion. The plurality of electrode tabs converge and connect away from the current collector to form a second convergence portion. The first convergence portion connects the second convergence portion and the active material coating portion. At least a portion of the first convergence portion is accommodated within the second hole segment, and the second convergence portion passes through the first hole segment.

21. The battery cell according to claim 10, wherein, The bracket is an integral structure; or the bracket is a split structure and includes a detachable first bracket and a second bracket, with the clearance hole defined between the first bracket and the second bracket.

22. The battery cell according to claim 19, wherein, The housing assembly includes a plurality of poles, at least one of which is the first pole.

23. The battery cell according to claim 22, wherein, The housing has a pressure relief section, which is located on the same side surface of the housing as the first pole post; or, the pressure relief section and the first pole post are located on two different sides of the housing.

24. The battery cell according to any one of claims 1-9, wherein, The housing has a pressure relief section. The housing includes a body and a cover. One end of the body is open. The cover is located at the open end of the body. The pressure relief section is located at the cover.

25. The battery cell according to any one of claims 1-9, wherein, Along a direction perpendicular to the projection plane, the ratio of the projected area of the welded part on the projection plane to the projected area of the first wall on the projection plane is within the range of 0.1% to 1%.

26. The battery cell according to any one of claims 1-9, wherein, The projected area of the second welding surface on the projection surface is greater than or equal to 3% of the total projected area of the first wall on the projection surface; And / or, The projected area of the first welding surface on the projection surface is greater than or equal to 25% of the total area of the projected area of the first wall on the projection surface.

27. The battery cell according to any one of claims 1-9, wherein, At least two first pole posts are provided on the first wall.

28. The battery cell according to any one of claims 1-9, wherein, The housing has two opposing first walls, each of which is provided with a first pole post.

29. The battery cell according to any one of claims 1-9, wherein, The mounting holes include a plurality of spaced-apart holes, the first electrode post includes a plurality of sub-electrodes of the same polarity, and the plurality of sub-electrodes are disposed one-to-one in the plurality of the plurality of the partition holes; the battery cell assembly includes a plurality of the active material coating portions, and the conductive portion includes a plurality of conductive portions connected one-to-one with the plurality of the active material coating portions, and each conductive portion is electrically connected to a sub-electrode post through a welding portion. Using the plane containing the cross-section of the mounting hole as the projection plane, along a direction perpendicular to the projection plane, the ratio of the sum of the projected areas of the plurality of welding portions on the projection plane to the projected area of the first wall on the projection plane is between 0.1% and 1%.

30. The battery cell according to any one of claims 1-9, wherein, The outer contour of the projection of the first pole on the projection plane is composed of straight lines, or a combination of straight lines and arcs.

31. The battery cell according to any one of claims 1-9, wherein, The dimension of the first pole post in the first direction is greater than or equal to the dimension of the first pole post in the second direction, and the first direction, the second direction and the axis of the mounting hole are perpendicular to each other.

32. The battery cell according to claim 31, wherein, The dimension of the first pole post in the first direction is greater than or equal to three times the dimension of the first pole post in the second direction; And / or, The first direction is the length direction of the first wall, and the second direction is the width direction of the first wall.

33. A battery, wherein, Includes the battery cell according to any one of claims 1-32.

34. An electrical appliance, wherein, Includes the battery according to claim 33.

Citation Information

Patent Citations

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Patent Information

AI Technical Summary

Abstract

Description

Patent Citations

Battery manufacturing method and battery

Battery cell, battery and electric device

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Pole, single battery and battery pack