Casing assembly, battery cell, battery and electrical device

Abstract

This application discloses a casing assembly, a battery cell, a battery, and an electrical device, the casing assembly including a casing and a first pole, the casing having a mounting hole, the first pole including an integrally molded pole body, a first position limiting block, and a second position limiting block, the pole body being drilled into the mounting hole, the first position limiting block and the second position limiting block being installed on both ends of the pole body along the axial direction of the mounting hole, the first position limiting block being fitted in a position limiting manner to the outside of the casing and the second position limiting block being fitted in a position limiting manner to the inside of the casing so that the first pole is riveted to the casing. The casing assembly of this application is easy to assemble and can improve the reliability and stability of the connection between the first pole and the casing.

Description

[Technical Field]

[0001] The present application relates to the field of battery technology, and in particular to casing assemblies, battery cells, batteries and electrical devices. [Background technology]

[0002] In recent years, new energy vehicles have made great strides in development, and in the field of electric vehicles, batteries play an irreplaceable and important role as the power source for electric vehicles. Typically, batteries contain multiple battery cells, and the battery cells are charged and discharged via poles. Currently, poles are usually attached to the battery cell casing by welding, which makes the pole attachment process relatively complicated and is detrimental to improving product production efficiency. Summary of the Invention

[0003] The present application aims to solve at least one of the technical problems existing in the related art, and to this end, the present application proposes a casing assembly, a battery cell, a battery, and an electric device that are easy to assemble.

[0004] In a first aspect, an embodiment of the present application provides a casing assembly including a casing having a mounting hole formed therein, and a first pole including an integrally molded pole body, a first position limiting block, and a second position limiting block, wherein the pole body is drilled into the mounting hole, and the first position limiting block and the second position limiting block are installed on both ends of the pole body along the axial direction of the mounting hole, and the first position limiting block is fitted in a position-limiting manner to the outside of the casing, and the second position limiting block is fitted in a position-limiting manner to the inside of the casing, so that the first pole is riveted to the casing.

[0005] In the above technical solution, the structure of the first pole includes a pole body, a first position limiting base, and a second position limiting base, so that the first pole can be riveted to the casing, which facilitates assembly of the first pole and the casing, simplifies the manufacturing process, and improves the reliability and stability of the connection between the first pole and the casing. Meanwhile, the pole body, first position limiting base, and second position limiting base of the first pole are integrally formed, which not only saves materials and costs but also ensures the strength of the first pole. As a result, once the first pole is fitted into the casing, it will not easily come off the casing due to vibration or external pulling during the charging and discharging of the battery cell, and is less likely to crack or be damaged by vibration or external pulling, thereby improving the stability and reliability of the battery cell.

[0006] In some embodiments, the cross section of the mounting hole is the projection plane, the axial direction of the mounting hole is the projection direction, and at least a portion of the circumferential profile of the projection of the first position limiting platform on the projection plane is a straight line, and / or at least a portion of the circumferential profile of the projection of the second position limiting platform on the projection plane is a straight line.

[0007] In the above technical solution, the first and second limiting supports are riveted to the casing after the flange of the post is formed. When the flange is riveted, if at least a portion of the first and second limiting supports is straight, the straight support is subjected to a smaller tensile force than the curved support, making it less likely to crack after the flange is riveted. This ensures the strength of the first post, improving its reliability and stability, and further improving the reliability and stability of the battery cell. At the same time, if at least a portion of the first and second limiting supports is straight, it can be fitted to the conductive part of the sheet structure, allowing the conductive part to fully utilize the space of the first post. This significantly improves the space utilization rate of the first post and ensures the energy density and fast charging performance of the battery cell.

[0008] In some embodiments, the cross section of the mounting hole is the projection plane, the axial direction of the mounting hole is the projection direction, and the circumferential profile of the projection of the first position limiting table on the projection plane is composed of straight lines and arc lines, and / or the circumferential profile of the projection of the second position limiting table on the projection plane is composed of straight lines and arc lines.

[0009] In the above technical solution, when the flanges are riveted, the straight portions of the first and second position limiting supports are subjected to a smaller tensile force than the arcuate portions, making them less likely to crack after the flanges are riveted, ensuring the strength of the terminal post and improving the reliability and stability of the terminal post, as well as the reliability and stability of the battery cell. The arcuate portions of the first and second position limiting supports are used to ensure that the first or second position limiting supports are smoothly riveted to the casing and formed, and also function as a connecting portion between the straight portions, ensuring the overall strength of the terminal post and the reliability and stability of the battery cell.

[0010] In some embodiments, the cross section of the mounting hole is the projection plane, the axial direction of the mounting hole is the projection direction, and the circumferential profile of the projection of the first position limiting platform on the projection plane includes two straight lines and two arc lines, the two straight lines are oppositely spaced apart, and the opposite ends of the two straight lines are each connected by an arc line; and / or the circumferential profile of the projection of the second position limiting platform on the projection plane includes two straight lines and two arc lines, the two straight lines are oppositely spaced apart, and the opposite ends of the two straight lines are each connected by an arc line.

[0011] In the above technical solution, the circumferential profile of the projection of the first position limiting base on the projection surface is configured to include two straight lines and two arc lines, and / or the circumferential profile of the projection of the second position limiting base on the projection surface is configured to include two straight lines and two arc lines, so that there is an appropriate ratio between the parts corresponding to the straight lines in the projection profile of the first position limiting base and the parts corresponding to the curves in the projection profile of the first position limiting base, and / or there is an appropriate ratio between the parts corresponding to the straight lines in the projection profile of the second position limiting base and the parts corresponding to the curves in the projection profile of the second position limiting base, thereby further achieving a balance between the strength of the first pole and the smoothness of the rivet joint, and improving the reliability and stability of the battery cell.

[0012] In some embodiments, the cross section of the mounting hole is the projection plane, the axial direction of the mounting hole is the projection direction, and the dimension of the projection of the first position limiting platform on the projection plane in the first direction is larger than the dimension of the projection of the first position limiting platform on the projection plane in the second direction, and / or the dimension of the projection of the second position limiting platform on the projection plane in the first direction is larger than the dimension of the projection of the second position limiting platform on the projection plane in the second direction, wherein the first direction, the second direction, and the axial direction are respectively perpendicular to each other.

[0013] In the above technical solution, by installing the first position limiting block and the second position limiting block in a long shape, the length of the mating portion between the first pole and the casing can be increased, improving the stability and reliability of the rivet joint and further improving the stability and reliability of the battery cell.

[0014] In some embodiments, the dimension in the first direction of the projection of the first position limiting table on the projection surface is more than three times the dimension in the second direction of the projection of the first position limiting table on the projection surface, and / or the dimension in the first direction of the projection of the second position limiting table on the projection surface is more than three times the dimension in the second direction of the projection of the second position limiting table on the projection surface.

[0015] In the above technical solution, by installing the first position limiting table and / or the second position limiting table so that the dimension in the first direction of the projection on the projection surface is at least three times the dimension in the second direction of the projection on the projection surface, it can be applied when the length in the first direction of the wall on which the first pole of the casing is installed is relatively long, and the dimension of the wall on which the first pole of the casing is installed can be fully utilized, the rivet joint area between the first pole and the casing can be increased, and the rivet joint strength with the first pole and the casing can be improved, thereby improving the reliability and stability of the battery cell.

[0016] In some embodiments, the casing has a first wall, the mounting holes are formed in the first wall, the first direction is a length direction of the first wall, and the second direction is a width direction of the first wall.

[0017] In the above technical solution, the first direction is set to the length direction of the first wall, and the second direction is set to the width direction of the first wall, so that the length direction of the first wall 1st The length direction of the cross section of the first pole can be aligned with the length direction of the cross section of the first pole, and the width direction of the first wall can be aligned with the width direction of the cross section of the first pole, thereby effectively achieving good matching between the first wall and the first pole at the first wall in both the first direction and the second direction, and the first pole at the first wall can further make full use of the placement area provided by the first wall, thereby increasing the rivet joint area between the first pole and the casing and improving the rivet joint strength between the first pole and the casing, thereby improving the reliability and stability of the battery cell.

[0018] In some embodiments, the length dimension of the pole body in the first direction is at least 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 at least 1 / 4 of the width dimension of the first wall in the second direction, and / or the cross-sectional area of ​​the fitting portion between the pole body and the mounting hole is at least 4% of the area of ​​the first wall, and / or the ratio of the thickness dimension of the pole body to the thickness dimension of the first wall along the axial direction of the mounting hole is greater than 1 and less than 1.5.

[0019] In the above technical solution, when at least one of the length ratio and width ratio of the post body to the first wall satisfies the corresponding range, the post body occupies a large proportion of the first wall in the length and width directions, and the dimensions of the fitting portion between the post body and the mounting hole are also large, thereby improving the stability of the riveting connection between the first post and the first wall, ensuring the strength of the riveting connection of the first post, and improving the reliability and stability of the battery cell. When the ratio of the cross-sectional area of ​​the post body to the area of ​​the first wall is within the above range, the current passing area of ​​the first post is large, improving the current passing capacity and fast charging capacity of the first post. When the ratio of the thickness of the post body to the thickness of the first wall satisfies the above corresponding range, the post body can be easily fitted securely into the mounting hole. The first and second position limiting blocks are disposed on the inside and outside of the casing, respectively, enabling smooth riveting of the first post, improving the convenience and reliability of riveting. At the same time, when all the parameters of the pole body are within the above ranges, the number of poles of the same polarity in the first wall can be one or more, particularly two, and the two poles are spaced apart along the second direction.

[0020] In some embodiments, the length dimension of the pole body in the first direction is at least 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 at least 1 / 2 of the width dimension of the first wall in the second direction, and / or the circumferential length of the fitting portion between the pole body and the mounting hole is at least 25% of the circumferential length of the first wall, and / or the cross-sectional area of ​​the fitting portion between the pole body and the mounting hole is at least 10% of the area of ​​the first wall, and / or the ratio of the thickness dimension of the pole body to the thickness dimension of the first wall along the axial direction of the mounting hole is greater than 1 and less than 1.5.

[0021] In the above technical solution, when at least one of the ratio of the length of the pole body to the length of the first wall, the ratio of the width of the pole body to the width of the first wall, and the ratio of the perimeter of the fitting between the pole body and the mounting hole to the perimeter of the first wall satisfies the above corresponding range, the proportion of the pole body in the length and width directions of the first wall is large, and the dimensions of the fitting portion between the pole body and the mounting hole are also large, thereby improving the stability of the rivet joint between the first pole and the first wall, ensuring the rivet joint strength of the first pole and improving the reliability and stability of the battery cell. When the ratio of the cross-sectional area of ​​the pole body to the area of ​​the first wall is within the above range, the current passing area of ​​the first pole is large, improving the current passing capacity and fast charging capability of the first pole. When the ratio of the thickness of the pole body to the thickness of the first wall is within the above corresponding range, the pole body can be easily fitted into the mounting hole. The first and second position limiting blocks are respectively installed inside and outside the casing, realizing smooth riveting of the first pole, improving the convenience and reliability of riveting. At the same time, when all the parameters of the pole body are within the above range, the number of first poles of the same polarity on the first wall can be one or more, especially two, and the two first poles are installed at an interval along the second direction. Of course, the number of first poles of the same polarity can also be four.

[0022] In some embodiments, the length dimension of the first position limiting base in the first direction is at least 1 / 3 of the length dimension of the first wall in the first direction, and / or the width dimension of the first position limiting base in the second direction is at least 1 / 4 of the width dimension of the first wall in the second direction, and / or the cross-sectional area of ​​the first position limiting base is at least 4.5% of the area of ​​the first wall, and / or the thickness dimension of the first position limiting base along the axial direction of the mounting hole is at least 0.6 of the thickness dimension of the first wall and at most 1.5 of the thickness dimension of the first wall.

[0023] In the above technical solution, when at least one of the ratio between the length of the first position limiting base and the length of the first wall and the ratio between the width of the first position limiting base and the width of the first wall satisfies the above corresponding range, the first position limiting base occupies a large proportion of the first wall in the length and width directions, and the dimensions of the fitting portion between the first position limiting base and the mounting hole are also large, thereby improving the stability of the riveting joint between the first pole and the first wall, ensuring the riveting strength of the first pole, and improving the reliability and stability of the battery cell. When the ratio of the cross-sectional area of ​​the first limiting block to the area of ​​the first wall is within the above range, the current passing area of ​​the first pole is large, improving the current passing capacity and fast charging capability of the first pole. When the ratio of the thickness of the first limiting block to the thickness of the first wall is within the above corresponding range, the first pole is prevented from easily separating from the first wall, further improving the reliability of the rivet joint. It is also advantageous to reduce the thickness of the part of the first limiting block that protrudes outside the casing, reducing the space occupied by the first pole outside the casing, and improving the volumetric energy density of the battery. At the same time, when all the parameters of the first limiting block are within the above range, the number of first poles of the same polarity on the first wall can be one or more, especially two, and the two first poles are spaced apart along the second direction. Of course, the number of first poles of the same polarity can also be four.

[0024] In some embodiments, the length dimension of the first position limiting base in the first direction is at least 1 / 3 of the length dimension of the first wall in the first direction, and / or the width dimension of the first position limiting base in the second direction is at least 1 / 2 of the width dimension of the first wall in the second direction, and / or the first position limiting base is columnar, and the circumferential dimension of the outer periphery of the first position limiting base is at least 30% of the circumferential dimension of the first wall, and / or the cross-sectional area of ​​the first position limiting base is at least 9% of the area of ​​the first wall, and / or the thickness dimension of the first position limiting base along the axial direction of the mounting hole is at least 0.6 of the thickness dimension of the first wall and at most 1.5 of the thickness dimension of the first wall.

[0025] In the above technical solution, when at least one of the ratio between the length of the first position limiting base and the length of the first wall, the ratio between the width of the first position limiting base and the width of the first wall, and the ratio between the perimeter of the first position limiting base and the perimeter of the first wall satisfies the above corresponding range, the first position limiting base occupies a large proportion of the first wall in the length and width directions, and the dimensions of the fitting portion between the first position limiting base and the mounting hole are also large, thereby improving the stability of the riveting joint between the first pole and the first wall, ensuring the riveting strength of the first pole, and improving the reliability and stability of the battery cell. When the ratio of the cross-sectional area of ​​the first limiting block to the area of ​​the first wall is within the above range, the current passing area of ​​the first pole is large, improving the current passing capacity and fast charging capability of the first pole. When the ratio of the thickness of the first limiting block to the thickness of the first wall is within the above corresponding range, the first pole is prevented from easily separating from the first wall, further improving the reliability of the rivet joint. It is also advantageous to reduce the thickness of the part of the first limiting block that protrudes outside the casing, reducing the space occupied by the first pole outside the casing, and improving the volumetric energy density of the battery. At the same time, when all the parameters of the first limiting block are within the above range, the number of first poles of the same polarity on the first wall can be one or more, especially two, and the two first poles are spaced apart along the second direction. Of course, the number of first poles of the same polarity can also be four.

[0026] In some embodiments, the length dimension of the second position limiting base in the first direction is at least 1 / 3 of the length dimension of the first wall in the first direction, and / or the width dimension of the second position limiting base in the second direction is at least 1 / 4 of the width dimension of the first wall in the second direction, and / or the cross-sectional area of ​​the second position limiting base is at least 4.5% of the area of ​​the first wall, and / or the thickness of the second position limiting base along the axial direction of the mounting hole is at least 0.6 of the thickness dimension of the first wall and at most 1.5 of the thickness dimension of the first wall.

[0027] In the above technical solution, when at least one of the ratio between the length of the second position limiting base and the length of the first wall and the ratio between the width of the second position limiting base and the width of the first wall satisfies the above corresponding range, the proportion of the second position limiting base in the length and width directions of the first wall is large, and the dimensions of the fitting portion between the second position limiting base and the mounting hole are also large, thereby improving the stability of the riveting joint between the first pole and the first wall, ensuring the riveting strength of the first pole, and improving the reliability and stability of the battery cell. When the ratio of the cross-sectional area of ​​the second limiting block to the area of ​​the first wall is within the above range, the current passing area of ​​the first pole is large, improving the current passing capacity and fast charging capability of the first pole. When the ratio of the thickness of the second limiting block to the thickness of the first wall is within the above corresponding range, the first pole is prevented from easily separating from the first wall, further improving the reliability of the rivet joint. This is advantageous in that the thickness of the second limiting block protruding into the casing is reduced, reducing the space occupied by the first pole in the casing and improving the volumetric energy density of the battery cell. At the same time, when all the parameters of the second limiting block are within the above range, the number of first poles of the same polarity on the first wall can be one or more, particularly two, and the two first poles are spaced apart along the second direction. Of course, the number of first poles of the same polarity can also be four.

[0028] In some embodiments, the length dimension of the second position limiting base in the first direction is at least 1 / 3 of the length dimension of the first wall in the first direction, and / or the width dimension of the second position limiting base in the second direction is at least 1 / 2 of the width dimension of the first wall in the second direction, and / or the second position limiting base is columnar, and the circumferential dimension of the outer periphery of the second position limiting base is at least 30% of the circumferential dimension of the first wall, and / or the cross-sectional area of ​​the second position limiting base is at least 9% of the area of ​​the first wall, and / or the thickness dimension of the second position limiting base along the axial direction of the mounting hole is at least 0.6 of the thickness dimension of the first wall and at most 1.5 of the thickness dimension of the first wall.

[0029] In the above technical solution, when at least one of the ratio between the length of the second position limiting base and the length of the first wall, the ratio between the width of the second position limiting base and the width of the first wall, and the ratio between the perimeter of the outer periphery of the second position limiting base and the perimeter of the first wall satisfies the above corresponding range, the proportion of the second position limiting base in the length and width directions of the first wall is large, and the dimensions of the fitting portion between the second position limiting base and the mounting hole are also large, thereby improving the stability of the riveting joint between the first pole and the first wall, ensuring the riveting strength of the first pole, and improving the reliability and stability of the battery cell. When the ratio of the cross-sectional area of ​​the second limiting block to the area of ​​the first wall is within the above range, the current passing area of ​​the first pole is large, improving the current passing capacity and fast charging capability of the first pole. When the ratio of the thickness of the second limiting block to the thickness of the first wall is within the above corresponding range, the first pole is prevented from easily separating from the first wall, further improving the reliability of the rivet joint. This is advantageous in that the thickness of the second limiting block protruding into the casing is reduced, reducing the space occupied by the first pole in the casing and improving the volumetric energy density of the battery cell. At the same time, when all the parameters of the second limiting block are within the above range, the number of first poles of the same polarity on the first wall can be one or more, particularly two, and the two first poles are spaced apart along the second direction. Of course, the number of first poles of the same polarity can also be four.

[0030] In some embodiments, the casing has a first wall, two mounting holes formed in the first wall, two first poles installed in each of the two mounting holes, and the two first poles have opposite polarities; or the casing has a first wall, four mounting holes formed in the first wall, four first poles installed in each of the four mounting holes, and two of the four first poles have the same polarity; or the casing has a first wall and a second wall, the second wall is angled or opposed to the first wall and spaced apart, and the first wall and the second wall each have a mounting hole formed in the first wall. One first pole is installed in each of the mounting holes and the mounting holes in the second wall, and the polarities of the two first poles are opposite; alternatively, the casing has a first wall, two mounting holes formed in the first wall, and two first poles of the same polarity are installed in each of the two mounting holes; the casing has a second wall that is angled with the first wall or spaced apart opposite to the first wall, and two mounting holes formed in the second wall, and one first pole is installed in each of the two mounting holes in the second wall, and the polarities of the two first poles in the second wall are the same and opposite to the polarity of the first poles in the first wall.

[0031] In the above technical solution, the poles are installed on the corresponding walls of the casing, which allows for flexible arrangement of the poles, which is advantageous for meeting different arrangement needs of the battery cells and for simplifying the power supply connection of the battery cells.

[0032] In some embodiments, the casing assembly further includes an insulating seal member disposed between the first pole and the casing.

[0033] In the above technical solution, an insulating seal member is installed between the electrode post and the casing, thereby improving the insulation and sealing performance between the electrode post and the casing, and increasing the reliability of the battery cell when the casing assembly is used in the battery cell.

[0034] In some embodiments, the insulating seal member includes an insulating member arranged between the first position limiting base and the casing, and a seal member arranged between the second position limiting base and the casing, and a portion of the insulating member and / or a portion of the seal member is fitted between the pole body and the peripheral wall of the mounting hole.

[0035] In the above technical solution, the insulating sealing member is installed to include an insulating member and a sealing member, which facilitates the insulating installation between the pole and the casing and improves the sealing performance between the pole body and the mounting hole.

[0036] In some embodiments, a first fitting groove is formed on the outer wall of the casing, and the first fitting groove is used to accommodate the insulating member.

[0037] In the above technical solution, the first fitting groove is provided on the outer wall of the casing to accommodate the insulating member, which facilitates positioning and installation of the insulating member and prevents, to a certain extent, misalignment of the insulating member during the riveting process between the terminal post and the casing. At the same time, provided that the casing can be used reliably, the provision of the first fitting groove is advantageous in reducing the height at which the insulating member protrudes from the outer wall of the casing, thereby also reducing the height at which the terminal post protrudes from the outer wall of the casing, thereby improving the volumetric energy density of the battery cell.

[0038] In some embodiments, the inner wall of the casing is formed with a mating projection that abuts and fits onto the seal member.

[0039] In the above technical solution, a fitting protrusion is provided on the inner wall of the casing, and abuts against and fits with the sealing member, thereby improving the sealing reliability of the sealing member.

[0040] In a second aspect, an embodiment of the present application provides a battery cell including a battery core assembly and the above-mentioned casing assembly, wherein the battery core assembly is disposed within the casing and electrically connected to a first pole.

[0041] In the above technical solution, the adoption of the above casing assembly simplifies the assembly of the first pole and the casing, improves the reliability and stability of the connection between the first pole and the casing, not only saving materials and costs but also ensuring the strength of the first pole. As a result, when the first pole is fitted into the casing, it will not easily come off the casing due to vibration or external pulling during the charging and discharging process of the battery cell, and will be less likely to crack or be damaged by vibration or external pulling, thereby improving the stability and reliability of the battery cell.

[0042] In some embodiments, the battery core assembly includes an active material application portion and a conductive portion, the active material application portion is housed in the casing, the conductive portion is used to electrically connect the active material application portion and the first pole, a housing portion is provided on the first pole, and at least a portion of the conductive portion is housed in the housing portion.

[0043] In the above technical solution, by providing a receiving section on the first pole, the weight of the first pole can be reduced to some extent, improving the weight energy density of the battery cell and the battery. Meanwhile, by accommodating at least a portion of the conductive section within the receiving section, the conductive section occupies less space within the first pole, reducing the space occupied by the conductive section within the casing. For a given casing size, this saves space for a larger active material coated section within the casing, thereby improving the volumetric energy density of the battery cell. At the same time, by accommodating at least a portion of the conductive section within the receiving section, the space occupied by the battery cells themselves can be reduced, allowing more battery cells to be accommodated in a given battery volume, further improving the volumetric energy density of the battery. Additionally, by accommodating at least a portion of the conductive section within the receiving section, the redundancy of the conductive section within the casing can be reduced to some extent, reducing the probability of short-circuiting between the conductive section and the active material coated section and thus reducing the probability of short-circuiting of the electrode assembly, thereby improving the operational reliability and stability of the battery cell and the battery.

[0044] In some embodiments, the accommodating portion has a first accommodating groove, the surface of the first pole facing the active material coated portion is the pole inner end face, the groove opening of the first accommodating groove is formed in the pole inner end face, and at least a portion of the conductive portion is accommodated in the first accommodating groove.

[0045] In the above technical solution, the first receiving groove in the first pole can reduce the weight of the first pole to some extent, thereby improving the weight-to-energy density of the battery cell and battery. Meanwhile, the opening of the first receiving groove is formed on the inner end surface of the pole, which is the surface of the first pole facing the active material coating portion. Therefore, the first receiving groove is open toward the active material coating portion, making it easier to insert the conductive portion into the first receiving groove and improving assembly efficiency. At the same time, because the first receiving groove faces the active material coating portion, it also functions as a buffer and temporary storage structure for the electrolyte, allowing more electrolyte to be accommodated in the casing. This allows the battery cell to extend its lifespan when there is a large amount of electrolyte, as electrolyte is consumed during the charging and discharging process of the battery cell. Furthermore, because the first receiving groove faces the active material coating portion, it also functions as a buffer and storage structure for gas generated inside the electrode assembly, reducing battery cell expansion and improving the reliability and stability of the battery cell. Furthermore, since the first receiving groove is located inside the pole, it is difficult for external foreign matter or impurities to enter the first receiving groove. impurities This reduces the influence of the heat generated by the electrode assembly on the electrode assembly, thereby ensuring the operational stability and reliability of the electrode assembly, thereby improving the stability and reliability of the battery cell and battery.

[0046] In some embodiments, the groove wall of the first receiving groove has a first sunken groove, and the position where the conductive portion and the first pole are electrically connected is at least partially located within the first sunken groove.

[0047] In the above technical proposal, by installing a first sunken groove in the first end wall, the first sunken groove can be used to realize pre-positioning of the conductive part, allowing for accurate alignment and electrical connection, thereby improving production efficiency; meanwhile, by installing a first sunken groove in the first end wall, the wall thickness of part of the first end wall can be locally thinned, which not only makes it easier to make electrical connection by welding, but also reduces the weight of the first pole and improves the weight-energy density of the battery cell.

[0048] In some embodiments, the first electrode post has a first groove, the surface of the first electrode post away from the active material application portion is the outer end face of the electrode post, and the groove opening of the first groove is formed in the outer end face of the electrode post.

[0049] In the above technical solution, by providing the first recess in the first pole, the weight of the first pole can be further reduced and the weight energy density of the battery cells and the battery can be improved. Meanwhile, the first recess is located on the outside of the first pole and can be used to accommodate or mount structural components that electrically connect the battery cells within the battery, thereby making full use of the space within the first pole and improving the space utilization rate and volumetric energy density of the battery. Furthermore, the first pole has an active material application portion that is simultaneously shared by the first accommodating groove and the first recessed groove, the first recessed groove is located on the side away from the first accommodating groove, and the first recessed groove is open in the direction away from the first accommodating groove. This is advantageous in that the conductive portion can be electrically connected to the groove wall of the first accommodating groove from the outside of the first pole via the first recessed groove, for example, making it easy to externally weld the first pole and the conductive portion via the first recessed groove, which also facilitates processing and manufacturing of the battery cell and reduces processing and manufacturing costs.

[0050] In some embodiments, the battery cell further includes a groove cover, which is attached to the first pole and seals the opening of the first groove.

[0051] In the above technical solution, the installation of the groove cover facilitates the electrical connection between adjacent battery cells in the battery, and the first groove separates the electrical connection between the battery cells from the electrical connection between the conductive part and the first pole, reducing interference between the two and further improving the stability and reliability of the battery cell. At the same time, the groove cover prevents foreign objects from entering the first groove, reducing interference between external foreign objects and the battery core assembly, further improving the reliability and stability of the battery cell.

[0052] In some embodiments, the accommodating portion has a second accommodating groove, the surface of the first pole facing away from the active material application portion is the pole outer end face, the groove opening of the second accommodating groove is formed on the pole outer end face, the second accommodating groove communicates with the inside of the casing via the first through hole, and the conductive portion is drilled in the first through hole and at least a portion of the conductive portion is accommodated in the second accommodating groove.

[0053] In the above technical solution, the second accommodating groove is provided in the first pole, thereby reducing the weight of the first pole to some extent and improving the weight-to-weight energy density of the battery cell and battery. Meanwhile, the second accommodating groove has a groove opening on the outer end surface of the pole, which is the surface facing away from the active material-coated portion of the first pole. Therefore, when at least a portion of the conductive portion is accommodated in the second accommodating groove, the groove opening of the second accommodating groove facilitates operations such as storing and arranging the conductive portion or electrically connecting the conductive portion to the first pole. This reduces the difficulty of battery cell production and improves battery cell production efficiency. At the same time, the second accommodating groove is connected to the casing via the first through-hole. Therefore, the second accommodating groove also functions as a buffer and temporary storage structure for the electrolyte, allowing more electrolyte to be accommodated in the casing. Because electrolyte is consumed during the charging and discharging process of the battery cell, a larger amount of electrolyte can extend the battery cell's lifespan. Furthermore, since the second accommodating groove is connected to the casing through the first through-hole, the second accommodating groove also functions as a structure for accommodating and buffering gas generated inside the electrode assembly, reducing the expansion of the battery cell and improving the reliability and stability of the battery cell.

[0054] In some embodiments, the second accommodating groove has a second sunken groove, and the position where the conductive portion and the first pole are electrically connected is at least partially located within the second sunken groove.

[0055] In the above technical solution, by installing a second sinking groove in the second accommodating groove, the second sinking groove can be used to realize pre-positioning of the conductive part, allowing for accurate alignment and electrical connection, thereby improving production efficiency.

[0056] In some embodiments, the casing assembly further includes a first cover plate, which is fitted with the first pole and seals the groove opening of the second receiving groove, and the first cover plate is electrically connected to the first pole.

[0057] In the above technical solution, by installing the first cover plate to seal the opening of the second accommodating groove, it is possible to prevent the electrolyte in the casing from leaking from the opening of the second accommodating groove. Furthermore, since the first cover plate seals the opening of the second accommodating groove and is electrically connected to the first pole, it is possible to easily realize an indirect electrical connection between the first pole and the bus member of the battery using the first cover plate, which is advantageous for increasing the connection area of ​​the electrical connection and further reducing the resistance of the electrical connection.

[0058] In some embodiments, the casing assembly further includes a second cover plate, which covers the outside of the conductive portion disposed in the first through hole and the second receiving groove.

[0059] In the above technical solution, when the electrolyte enters the second receiving groove through the first through-hole, the second cover plate can alleviate the problem of the electrolyte overflowing from the first pole, thereby improving the reliability of the battery cell.

[0060] In some embodiments, the battery cell further includes a support disposed within the casing and located on a side of the active material application portion that is close to the first pole, the support having an escape hole for avoiding the conductive portion, and the conductive portion extending through the escape hole on a side of the support that is away from the active material application portion.

[0061] In the above technical solution, by providing an escape hole in the support, the conductive part can be guided and restrained so that it passes through the escape hole and fits into the first pole, which not only simplifies the arrangement of the conductive part and saves on the material used for the conductive part, reducing costs, but also allows the support to guide and support the fitting between the conductive part and the first pole, reducing the risk of short-circuiting between the conductive part and the active material coated part, and further improving the reliability of the battery cell.

[0062] In some embodiments, the support is provided with a guide portion, the guide portion surrounding at least a portion that forms the relief hole, and the guide portion extending at least partially into the receiving portion.

[0063] In the above technical solution, the support has a guide portion at least a portion of which extends into the receiving portion, and the guide portion surrounds at least a portion of the escape hole, so that at least a portion of the conductive portion can be easily received in the receiving portion, improving the assembly efficiency of the conductive portion. At the same time, the installation of the guide portion makes the fit between the support and the pole, and between the support and the conductive portion, both tighter and more reliable, making the battery cell structure more compact and favorable for improving the energy density of the battery cell.

[0064] In some embodiments, the relief hole includes a first hole section and a second hole section, the second hole section being located on a side of the first hole section that is closer to the active material-coated portion, and the cross-sectional area of ​​the second hole section gradually increases in a direction away from the first hole section. The active material-coated portion includes a current collector and an active material layer disposed on the current collector. The conductive portion is electrically connected to the current collector and includes a tab portion, the tab portion including a plurality of tab sheets, the plurality of tab sheets coming together at a position closer to the current collector to form a first converging portion, and the plurality of tab sheets coming together at a position away from the current collector to form a second converging portion. The first converging portion connects the second converging portion and the active material-coated portion, at least a portion of the first converging portion being received within the second hole section, and the second converging portion being drilled through the first hole section.

[0065] In the above technical solution, the escape hole is configured to include a second hole section that gradually widens toward the active material application section, so that the second hole section can accommodate more of the first converging section, improving the compactness of the fit between the support and the battery core assembly, making the overall volume of the battery cell smaller, allowing the battery to accommodate more battery cells, and improving the volumetric energy density of the battery.

[0066] In some embodiments, the support is a unitary structure, or the support is a separate structure including a removable first support and a second support, and the relief hole is defined between the first support and the second support.

[0067] In the above technical solution, if the support has an integral structure, the support is easy to process and has relatively good reliability, and the support and casing assembly are easily assembled, improving assembly efficiency and fitting stability. If the support has a separate structure, an escape hole is defined by the engagement of the first support and the second support, and when assembling the support and the battery core assembly, there is no need to pass the conductive part from one end to the other through the escape hole. Instead, the first support and the second support can be combined at the position of the conductive part to sandwich the conductive part, so that the escape hole surrounds the conductive part, making it easy to assemble the support and the battery core assembly and improving assembly efficiency.

[0068] In some embodiments, the battery cell further includes an inner insulating member disposed within the casing, enveloping the outside of the active material coating portion, and connected to the support.

[0069] In the above technical solution, by wrapping the inner insulating member around the outside of the active material application portion, the reliability of the insulation between the active material application portion and the casing is improved, corrosion of the casing due to contact between the active material application portion and the casing is reduced or prevented, and the problem of electrolyte leakage due to casing corrosion is reduced, thereby improving the reliability of the battery cell. Meanwhile, by connecting the inner insulating member to the support, the difficulty of fixing the inner insulating member is reduced, and the reliability of the inner insulating member wrapping around the outside of the active material application portion is improved.

[0070] In some embodiments, the casing assembly includes a plurality of pole posts, and at least one pole post is a first pole post.

[0071] In the above technical solution, at least one of all the poles of the casing assembly is a first pole, so that the entire battery cell can be made up of first poles with some or all of the poles having receiving portions, which allows for flexible selection and combination according to actual needs such as energy density and cost, thereby improving the applicability of the battery cell.

[0072] In some embodiments, the casing has a pressure relief portion, the pressure relief portion being located on the same surface as the first pole, or the pressure relief portions being located on two surfaces on different sides of the casing from the first pole.

[0073] In the above technical solution, if the electrode post and the pressure relief part are installed on the same side, processing and assembly are easy, while if the electrode post and the pressure relief part are installed on different sides, space can be saved, the volume of the electrode post can be increased, and the adverse effect on the electrode post when the pressure relief part releases pressure can be reduced.

[0074] In some embodiments, the casing has a pressure relief portion, the casing includes a casing body and a casing cover, one end of the casing body is open, the casing cover is provided at the open end of the casing body, and the pressure relief portion is provided at the casing cover.

[0075] In the above technical solution, the pressure relief part is easy to process and has high pressure relief reliability.

[0076] In a third aspect, embodiments of the present application provide a battery including the battery cell described above.

[0077] In the above technical solution, the battery is equipped with the above battery cell, and the structure of the first pole of the battery cell includes a pole body, a first position limiting base, and a second position limiting base. Therefore, the first pole can be riveted to the casing, which facilitates assembly of the first pole and the casing, simplifies the manufacturing process, and ensures a reliable and stable connection between the first pole and the casing. Meanwhile, the pole body, first position limiting base, and second position limiting base of the first pole are integrally formed, which not only saves materials and costs but also ensures the strength of the first pole. Therefore, once the first pole is fitted into the casing, it will not easily come off the casing due to vibration or external pulling during the charging and discharging of the battery cell, and is less likely to crack or be damaged by vibration or external pulling. This improves the stability and reliability of the battery cell, and further improves the stability and reliability of the battery.

[0078] In a fourth aspect, embodiments of the present application further provide an electrical device comprising the battery described above.

[0079] In the above technical solution, the battery is installed in the electrical device, which improves the stability and reliability of the battery, thereby improving the operational stability and reliability of the electrical device.

[0080] The above and / or additional aspects and advantages of the present application will become more apparent and understandable from the following detailed description of the embodiments with reference to the accompanying drawings. [Brief explanation of the drawings]

[0081] [Figure 1] 1 is a schematic diagram of an electrical device provided in accordance with some embodiments of the present application. [Figure 2] FIG. 1 is an exploded view of a battery provided in accordance with some embodiments of the present application. [Figure 3] 1 is a schematic diagram of a battery cell provided in accordance with some embodiments of the present application. [Figure 4] FIG. 4 is a schematic diagram of the battery cell shown in FIG. 3. [Figure 5] FIG. 4 is an orthographic view of the battery cell shown in FIG. 3. [Figure 6] FIG. 6 is a cross-sectional view taken along line A-A in FIG. 5. [Figure 7] 1 is a cross-sectional view of a casing assembly provided in accordance with some embodiments of the present application. [Figure 8] 1 is a schematic assembly diagram of a first pole post and a first wall provided by some embodiments of the present application; [Figure 9] FIG. 7 is another assembly schematic diagram of the first pole and the first wall shown in FIG. 6. [Figure 10] 1 is a schematic assembly diagram of a first pole post and a first wall provided by some embodiments of the present application; [Figure 11] FIG. 9 is another assembly schematic diagram of the first pole pillar and the first wall shown in FIG. 8. [Figure 12] 1 is a schematic assembly diagram of a first pole post and a first wall provided by some embodiments of the present application; [Figure 13] FIG. 11 is another assembly schematic diagram of the first pole and the first wall shown in FIG. 10. [Figure 14] 1 is a schematic assembly diagram of a first pole post and a first wall provided by some embodiments of the present application; [Figure 15] 1 is a schematic assembly diagram of a first pole post and a first wall provided by some embodiments of the present application; [Figure 16] FIG. 14 is a cross-sectional view taken along line VV in FIG. [Figure 17]1 is a schematic assembly diagram of a first pole post and a first wall provided by some embodiments of the present application; [Figure 18] FIG. 16 is another assembly schematic diagram of the first pole and the first wall shown in FIG. 15. [Figure 19] 2 is a cross-sectional view of a first pole post and a first wall provided in accordance with some embodiments of the present application. [Figure 20] 2 is a cross-sectional view of a first pole post and a first wall provided in accordance with some embodiments of the present application. [Figure 21] 1A-1C are schematic diagrams illustrating an assembly process of a first pole post and a first wall provided according to some embodiments of the present application. [Figure 22] 2 is a cross-sectional view of a first pole post and a first wall provided in accordance with some embodiments of the present application. [Figure 23] 2 is a cross-sectional view of a first pole post and a first wall provided in accordance with some embodiments of the present application. [Figure 24] 2 is a cross-sectional view of a first pole and casing provided in accordance with some embodiments of the present application. [Figure 25] 2 is a cross-sectional view of a first pole and casing provided in accordance with some embodiments of the present application. [Figure 26] 1 is a schematic diagram of a first pole provided in accordance with some embodiments of the present application; [Figure 27] 1 is a structural schematic diagram of a battery cell provided by some embodiments of the present application; [Figure 28] 1 is an assembly diagram of a second pole provided in accordance with some embodiments of the present application, a battery core assembly, and a casing. [Figure 29] 1 is a schematic cross-sectional view of a battery cell provided in accordance with some embodiments of the present application. [Figure 30] 1 is a schematic cross-sectional view of a battery cell provided in accordance with some embodiments of the present application. [Figure 31] 1 is a schematic cross-sectional view of a battery cell provided in accordance with some embodiments of the present application. [Figure 32] 1 is a schematic cross-sectional view of a battery core assembly provided in accordance with some embodiments of the present application. [Figure 33]1 is a diagram illustrating a convergence scheme for multiple tabs of a battery core assembly provided by some embodiments of the present application. [Figure 34] 1 is a schematic cross-sectional view of a battery cell provided in accordance with some embodiments of the present application. [Figure 35] 1 is a schematic cross-sectional view of a battery cell provided in accordance with some embodiments of the present application. [Figure 36] 1 is a schematic cross-sectional view of a battery cell provided in accordance with some embodiments of the present application. [Figure 37] 1 is a schematic cross-sectional view of a battery cell provided in accordance with some embodiments of the present application. [Figure 38] 1 is a schematic cross-sectional view of a battery cell provided in accordance with some embodiments of the present application. [Figure 39] FIG. 4 is an enlarged view of a portion W in FIG. 3. [Figure 40] 1A-1C are orthographic views of a plurality of first polar pillars provided by some embodiments of the present application. [Figure 41] 1 is a schematic cross-sectional view of a battery cell provided in accordance with some embodiments of the present application. [Figure 42] 1 is a schematic cross-sectional view of a battery cell provided in accordance with some embodiments of the present application. [Figure 43] 1 is a schematic cross-sectional view of a battery cell provided in accordance with some embodiments of the present application. [Figure 44] 1 is an exploded view of a battery cell structure provided in accordance with some embodiments of the present application. [Figure 45] 1 is a schematic cross-sectional view of a casing assembly provided in accordance with some embodiments of the present application. [Figure 46] FIG. 46 is an exploded structural view of the casing assembly shown in FIG. 45. [Figure 47] FIG. 47 is an exploded view of the first cover plate shown in FIG. 46. [Figure 48] 1 is a schematic cross-sectional view of a battery cell provided in accordance with some embodiments of the present application. [Figure 49] FIG. 49 is an exploded view of the structure of the battery cell shown in FIG. 48. [Figure 50]1 is a schematic cross-sectional view of a battery cell provided in accordance with some embodiments of the present application. [Figure 51] 1 is a schematic cross-sectional view of a battery cell provided in accordance with some embodiments of the present application. [Figure 52] 1 is a schematic cross-sectional view of a battery cell provided in accordance with some embodiments of the present application. [Figure 53] 1 is a schematic cross-sectional view of a battery cell provided in accordance with some embodiments of the present application. [Figure 54] 1 is a schematic cross-sectional view of a battery cell provided in accordance with some embodiments of the present application. [Figure 55] 1 is a schematic diagram of a battery core assembly and a support mating provided by some embodiments of the present application. [Figure 56] FIG. 56 is a cross-sectional view taken along line CC in FIG. 55. [Figure 57] 1 is a structural schematic diagram of an integral support provided by some embodiments of the present application. [Figure 58] 1 is a structural schematic diagram of a separate support provided by some embodiments of the present application. [Figure 59] 1 is a schematic cross-sectional view of a battery core assembly and support provided by some embodiments of the present application. [Figure 60] 1 is an exploded structural view of a battery core assembly, a support, and a casing assembly provided in accordance with some embodiments of the present application. [Figure 61] 2 is an exploded view of the structure of a first pole post, a casing, and a seal pad provided in accordance with some embodiments of the present application. FIG. [Figure 62] FIG. 62 is an assembly diagram of the first pole, casing, and seal pad shown in FIG. 61. [Figure 63] 1 is a structural schematic diagram of a first pole pillar provided by some embodiments of the present application; [Figure 64] 1 is a cross-sectional view of a battery cell according to some embodiments of the present application. [Figure 65] 1 is a cross-sectional schematic view of a casing assembly provided in accordance with some embodiments of the present application. [Figure 66]1 is a cross-sectional schematic view of a casing assembly provided in accordance with some embodiments of the present application. [Figure 67] FIG. 1 is an orthographic view of a battery cell provided in accordance with some embodiments of the present application. [Figure 68] FIG. 68 is a cross-sectional view taken along line EE in FIG. 67. [Figure 69] 1 is a schematic cross-sectional view of a battery cell provided in accordance with some embodiments of the present application. [Figure 70] FIG. 1 is an orthographic view of a battery cell provided in accordance with some embodiments of the present application. [Figure 71] FIG. 71 is a cross-sectional view taken along line UU in FIG. [Figure 72] FIG. 72 is an enlarged view of the circled V portion in FIG. 71. [Figure 73] 1 is a structural schematic diagram of a casing cover provided by some embodiments of the present application; DETAILED DESCRIPTION OF THE INVENTION

[0082] [Explanation of symbols] Electric device 1000, battery 100, controller 200, motor 300, First direction X, second direction Y, third direction Z, Battery cell 10, case 20, first case part 201, second case part 202, Casing assembly 1, Casing 11, first wall 110, second wall 11b, First fitting groove 11c, fitting protrusion 11d, second fitting groove 11e, casing body 111, casing cover 112, mounting hole 113, First pole 12, pole body 12a, first position limiting base 12b, second position limiting base 12c, Receiving section 121, a first receiving groove 12110, a first end wall 12111, a first recessed groove 12112, a first side wall 12113, a second receiving groove 12120, a second end wall 12121, a second recessed groove 12122, a second side wall 12123, a first groove step 12124, a second groove step 12125, a guide slope 12126, a step surface 12127, a first through hole 12130; A third receiving groove 12140, a fourth receiving groove 12150, a second through hole 12160, a third through hole 12170, Pole column inner end surface 122, pole column outer end surface 123, First pole portion 124, second pole portion 125, First groove 126, spacing portion 127, Stopper portion 1281, perforation portion 1282, flange portion 1283, First part 1291, second part 1292, a first cover plate 13, a first conductive member 131, a second recessed groove 1311, a second conductive member 132, a stress relief groove 133, A second cover plate 14, a second pole 15, a pressure release portion 16, a liquid injection hole 17, a relief groove 18, Battery core assembly 2, electrode assembly 2a, Active material coating portion 21, conductive portion 22, current collector 211, active material layer 212, Tab portion 221, tab sheet 2211, first converging portion 2212, second converging portion 2213, adapter sheet 222, Support 3, relief hole 31, first hole section 311, second hole section 312, Guide portion 32, first support 33, second support 34, casing-encased guide surface 35, main body portion 36, extension portion 37, an inner insulating member 4, a second sealing member 6, a groove cover 7, An insulating seal member 8, an insulating member 81, and a first seal member 82.

[0083] In order to clarify the objectives, technical solutions and advantages of the embodiments of the present application, the technical solutions of the embodiments of the present application will be clearly described below in conjunction with the drawings of the embodiments of the present application, but it is obvious that the described embodiments are only some of the embodiments of the present application, and do not represent all of the embodiments of the present application. All other embodiments that can be obtained by those skilled in the art based on the embodiments of the present application without any creative work also belong to the scope of the claims of the present application.

[0084] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art, and the terms used in the specification of the present application are only for describing specific embodiments and are not intended to limit the present application. The terms "comprise" and "have" and any variations thereof in the specification, claims, and drawings of the present application are intended to cover a non-exclusive inclusion. Terms such as "first," "second," etc. in the specification, claims, and drawings of the present application are used to distinguish between different objects and are not used to describe a particular order or priority.

[0085] In this application, reference to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. The appearances of the phrase in various places in the specification do not necessarily refer to the same embodiment, nor are they mutually exclusive, separate, or alternative embodiments of other embodiments.

[0086] The term "and / or" in this application is merely a relation that describes related objects and indicates that three types of relations can exist. For example, A and / or B can indicate three cases: the presence of only A, the simultaneous presence of A and B, and the presence of only B. In addition, the symbol " / " in this application generally indicates that the related objects before and after it are in an "or" relationship.

[0087] In the embodiments of the present application, the same drawing symbols represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments will be omitted. It should be understood that the dimensions such as thickness, length, and width of various components in the embodiments of the present application shown in the drawings, and the overall dimensions such as thickness, length, and width of the integrated device, are merely illustrative and do not constitute any limitations on the present application.

[0088] The term "plurality" as used herein refers to two or more (including two).

[0089] In this application, battery cells may include lithium-ion secondary battery cells, lithium-ion primary battery cells, lithium-sulfur battery cells, sodium-lithium ion battery cells, sodium ion battery cells, magnesium ion battery cells, etc., but the embodiments of this application are not limited thereto. Battery cells may be cylindrical, flat, rectangular, or have other shapes, but the embodiments of this application are not limited thereto. Battery cells are generally classified into three types depending on the encapsulation method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, but the embodiments of this application are not limited thereto.

[0090] The battery referred to in the examples of this application refers to a single physical module containing one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may be a battery module or a battery pack. The battery If the battery is a battery module, the battery module is composed of multiple battery cells, and if the battery is a battery pack, the battery pack can be directly composed of a case and multiple battery cells installed in the case, or it can be composed by first configuring a battery module with battery cells and then installing the battery module in a case.

[0091] Specifically, a battery cell typically includes a casing, a battery core assembly, and an electrolyte, the casing being used to house the battery core assembly and the electrolyte, and at least one positive electrode post and at least one negative electrode post being provided in the casing, the battery core assembly including one or more electrode assemblies, the electrode assemblies being formed by stacking or winding positive electrode pieces, negative electrode pieces, and separator films.

[0092] The positive electrode piece generally includes a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer is directly or indirectly coated on the positive electrode current collector. The positive electrode current collector without the positive electrode active material layer protrudes from the positive electrode current collector with the positive electrode active material layer coated thereon, and the positive electrode current collector without the positive electrode active material layer is used as a positive electrode tab sheet. Multiple positive electrode tab sheets are stacked and electrically connected to the positive electrode pole. For example, multiple stacked positive electrode tab sheets can be directly welded to the positive electrode pole to form an electrical connection. Alternatively, the battery core assembly can include a positive electrode adapter sheet. Multiple stacked positive electrode tab sheets are welded to one end of the positive electrode adapter sheet and the other end of the positive electrode adapter sheet is welded to the positive electrode pole to electrically connect the positive electrode tab sheet and the positive electrode pole.

[0093] The negative electrode piece generally includes a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer being directly or indirectly coated on the negative electrode current collector, the negative electrode current collector not coated with the negative electrode active material layer protruding from the negative electrode current collector coated with the negative electrode active material layer, and the positive electrode current collector not coated with the negative electrode active material layer being used as a negative electrode tab sheet, and multiple negative electrode tab sheets are stacked together and electrically connected to the negative electrode post. For example, the multiple stacked negative electrode tab sheets can be directly welded to the negative electrode post to form the electrical connection, or the battery core assembly can include a negative electrode adapter sheet, and the multiple stacked negative electrode tab sheets can be welded to one end of the negative electrode adapter sheet and the other end of the negative electrode adapter sheet to electrically connect the negative electrode tab sheet and the negative electrode post.

[0094] The material of the separator film is not particularly limited and may be, for example, polypropylene or polyethylene. The shape of the casing can be adjusted according to the type of battery cell. The type of battery cell in the embodiments of this application is not particularly limited. For example, if the battery cell is a prismatic battery, the casing is prismatic, and if the battery cell is a cylindrical battery, the casing is cylindrical. At the same time, the battery cell functions mainly by the movement of metal ions between the positive and negative electrode pieces. Taking a lithium-ion battery as an example, the positive electrode current collector may be made of aluminum, the positive electrode active material layer may be made of lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc., the negative electrode current collector may be made of copper, and the negative electrode active material layer may be made of carbon or silicon. During the charge and discharge process, Li+ ions repeatedly intercalate and deintercalate between the two electrodes. During charging, Li+ ions are deintercalated from the positive electrode and intercalated into the negative electrode via the electrolyte, leaving the negative electrode in a lithium-rich state, and vice versa during discharge.

[0095] In recent years, new energy vehicles have made great strides, and in the field of electric vehicles, batteries play an irreplaceable and important role as the power source for electric vehicles. As a core component of new energy vehicles, batteries must meet high requirements in terms of both energy density and reliability.

[0096] In the related art, the battery core assembly of the battery cell is electrically connected to the poles, and charging and discharging of the battery cell is realized through the poles. However, due to constraints such as pole design, the poles are usually attached to the casing of the battery cell by welding, which makes the pole attachment process relatively complicated. Furthermore, due to the existence of welding defects, there is a risk that the poles will easily separate from the casing during use of the battery cell, which may affect the reliability of the battery cell.

[0097] In view of this, the present application provides a casing assembly including a casing having a mounting hole formed therein, and a first pole including an integrally molded pole body, a first position limiting base, and a second position limiting base, wherein the pole body is drilled into the mounting hole, the first position limiting base and the second position limiting base are installed on both ends of the pole body along the axial direction of the mounting hole, and the first position limiting base is fitted to the outside of the casing in a position-limiting manner, and the second position limiting base is fitted to the inside of the casing in a position-limiting manner, so that the first pole is riveted to the casing.

[0098] In the casing assembly configured as described above, the first pole structure is configured to include the pole body, the first position limiting block, and the second position limiting block. This allows the first pole to be riveted to the casing, facilitating assembly of the first pole and the casing, simplifying the manufacturing process, and improving the reliability and stability of the connection between the first pole and the casing. Meanwhile, the pole body, the first position limiting block, and the second position limiting block are integrally formed, which not only saves materials and costs but also ensures the strength of the first pole. As a result, when the first pole is fitted into the casing, it will not easily come off the casing due to vibration or external pulling during the charging and discharging of the battery cell, and is less likely to crack or be damaged by vibration or external pulling, thereby improving the stability and reliability of the battery cell.

[0099] The battery cells disclosed in the embodiments of the present application employ the above-described casing assembly, and the battery cells can be used in, but are not limited to, electric devices such as vehicles, ships, and spacecraft. The battery cells disclosed in the present application can be used to configure the power supply systems of the electric devices, thereby contributing to expanding the range of applications of the battery cells.

[0100] An embodiment of the present application provides an electric device that uses a battery cell as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, an electric scooter, an electric vehicle, a boat, a spacecraft, etc. Among them, the electric toy may include a stationary or mobile electric toy, such as a game console, an electric toy vehicle, an electric toy boat, and an electric toy airplane, and the spacecraft may include an airplane, a rocket, a space shuttle, a spaceship, etc.

[0101] In the following examples, the electric device is a vehicle, and the casing assembly, battery cell, battery, and electric device provided in the examples of the present application will be described in detail.

[0102] Referring to FIG. 1, FIG. 1 is a structural schematic diagram of an electric device 1000, which is a vehicle provided by some embodiments of the present application. The vehicle may be a fuel-powered vehicle, a gas-powered vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, a range-extended vehicle, etc. A battery 100 is installed inside the vehicle, and the battery 100 may be installed at the bottom, head, or tail of the vehicle. The battery 100 is used to supply power to the vehicle. For example, the battery 100 may function as an operating power source for the vehicle. The vehicle may further include a controller 200 and a motor 300. The controller 200 controls the battery 100 to supply power to the motor 300, for example, to meet the operating power needs during starting, navigation, and driving of the vehicle. In some embodiments of the present application, the battery 100 can be used not only as an operating power source for the vehicle but also as a driving power source for the vehicle, thereby providing driving power to the vehicle in place of or partially replacing fuel or natural gas.

[0103] Referring to Figure 2, Figure 2 is an exploded view of a battery 100 according to some embodiments of the present application. The battery 100 includes a case 20 and battery cells 10, which are housed within the case 20. The case 20 provides an assembly space for the battery cells 10, and the case 20 may have various structures. In some embodiments, the case 20 may include a first case part 201 and a second case part 202, which cover each other and jointly define an assembly space for housing the battery cells 10. The second case part 202 may have a hollow structure with one end open, and the first case part 201 may have a plate-like structure, with the first case part 201 covering the open side of the second case part 202, so that the first case part 201 and the second case part 202 jointly define an assembly space, or the first case part 201 and the second case part 202 may both have a hollow structure with one end open, with the open side of the first case part 201 covering the open side of the second case part 202. Of course, the case 20 formed by the first case part 201 and the second case part 202 may have various shapes, such as a cylindrical shape or a rectangular parallelepiped shape.

[0104] The battery 100 may include one or more battery cells 10. When the battery 10 includes multiple battery cells 10, the multiple battery cells 10 may be connected in series, parallel, or series-parallel. A series-parallel connection refers to multiple battery cells 10 being connected in both series and parallel. The multiple battery cells 10 are connected in direct series, parallel, or series-parallel, and the entire battery cell set is housed within a case 20. Of course, the battery 100 may also be formed by first connecting multiple battery cells 10 in series, parallel, or series-parallel to form a battery module pack, and then connecting multiple battery packs in series, parallel, or series-parallel to form the entire battery pack housed within the case 20. The battery 100 may also include other structures, such as a bus member for electrically connecting the multiple battery cells 10.

[0105] Referring to FIG. 3, FIG. 3 is a schematic diagram of a battery cell 10 employing a casing assembly 1 provided by some embodiments of the present application. The battery cell 10 is a rectangular parallelepiped, and the length direction of the battery cell is defined as a first direction X, the thickness direction of the battery cell 10 is defined as a second direction Y, and the height direction of the battery cell 10 is defined as a third direction Z. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other. However, the present application is not limited thereto, and in other embodiments of the present application, the battery cell 10 The battery cell 10 may be cylindrical, flat, or have other shapes. In detail, referring again to Figures 3 to 8, Figure 3 is a schematic diagram of a battery cell 10 provided according to some embodiments of the present application, Figure 4 is a schematic diagram of the battery cell shown in Figure 3, Figure 7 is an orthographic view of the battery cell shown in Figure 3, and Figure 8 is a cross-sectional view taken along line A-A in Figure 7, and in the embodiment of the present application, the battery cell 10 includes a battery core assembly 2 and a casing assembly 1.

[0106] The casing assembly 1 includes a casing 11 and a first pole 12, the casing 11 having a mounting hole 113 formed therein, the first pole 12 being installed in the mounting hole 113 so as to be electrically connected to the battery core assembly 2, the casing 11 having a first wall 110 having a mounting hole 113 formed therein, and the first wall 110 having the first pole 12 mounted therein, the axial direction of the mounting hole 113 being the third direction Z.

[0107] The shape of the casing 11 can be adjusted according to the type of battery cell 10, and the type of battery cell 10 in the embodiments of the present application is not particularly limited. For example, if the battery cell 10 is a prismatic battery, the casing 11 will be prismatic, and if the battery cell 10 is a cylindrical battery, the casing 11 will be cylindrical. In the embodiments of the present application, the casing 11 will be prismatic. The casing 11 is provided with poles, which are used for electrical connection with the battery core assembly 2 to ensure normal charging and discharging of the battery cell 10. Generally, there are at least two poles, specifically, at least one positive pole and at least one negative pole. For example, if there are two poles, one is a positive pole and the other is a negative pole, which are electrically connected to the positive and negative output positions of the battery core assembly 2, respectively. Also, if there are four poles, two may be positive poles and the remaining two may be negative poles, with the two positive poles both electrically connected to the positive output position of the battery core assembly 2 and the two negative poles both electrically connected to the negative output position of the battery core assembly 2.

[0108] The battery core assembly 2 includes an active material application portion 21 and a conductive portion 22. The active material application portion 21 is accommodated in the casing 11. The active material application portion 21 is a portion of the battery core assembly 2 to which an active material is applied, and can assist in the insertion and desorption of metal ions during the charge and discharge process of the battery cell 10. The conductive portion 22 is a metal structure that electrically connects the active material application portion 21 and the electrode post, which is not coated with an active material. The conductive portion 22 is used to electrically connect the active material application portion 21 and the first electrode post 12.

[0109] The active material coated portion 21 is divided into a positive electrode active material coated portion and a negative electrode active material coated portion, the positive electrode active material coated portion includes a portion where a positive electrode active material layer is coated on a positive electrode current collector, and the negative electrode active material coated portion includes a portion where a negative electrode active material layer is coated on a negative electrode current collector. The conductive portion 22 is divided into a positive electrode conductive portion and a negative electrode conductive portion, the positive electrode conductive portion electrically connects the positive electrode active material coated portion and the positive electrode pole, and the negative electrode conductive portion electrically connects the negative electrode active material coated portion and the negative electrode pole.

[0110] Referring to Figure 7, Figure 7 is a cross-sectional view of a casing assembly 1 provided in some embodiments of the present application. In the embodiment of the present application, the casing assembly 1 includes a casing 11 and a first pole 12, and a mounting hole 113 is formed in the casing 11. The first pole 12 is installed in the mounting hole 113 so as to be electrically connected to the conductive portion 22 of the battery core assembly 2. At the same time, the first pole 12 includes a pole body 12a, a first position limiting base 12b, and a second position limiting base 12c, and the pole body 12a, the first position limiting base 12b, and the second position limiting base 12c are integrally molded, that is, the pole body 12a, the first position limiting base 12b, and the second position limiting base 12c are integrally molded, and the pole body 12a is drilled into the mounting hole 113, and the first position limiting base 12b and the second position limiting base 12c are installed at both ends of the pole body 12a along the axial direction of the mounting hole 113, and the first position limiting base 12b is positionally limited and fitted to the outside of the casing 11, and the second position limiting base 12c is positionally limited and fitted to the inside of the casing 11, so that the first pole 12 is riveted to the casing 11.

[0111] Therefore, the first position limiting base 12b and the second position limiting base 12c extend radially outward from the peripheral wall of the mounting hole 113 along the radial direction of the mounting hole 113, and the first position limiting base 12b and the second position limiting base 12c are arranged such that the first pole post 12 is aligned along the axial direction (third direction Z) of the mounting hole 113 relative to the casing 11. Luck This limits the movement of the first terminal post 12, making it easy to securely attach the first terminal post 12 to the attachment hole 113 via the first position limiting base 12b and the second position limiting base 12c, achieving a fixed connection between the first terminal post 12 and the casing 11, and facilitating the assembly of the first terminal post 12 and the casing 11. At the same time, by riveting the first terminal post 12 to the casing 11, a highly reliable connection between the first terminal post 12 and the casing 11 can be easily achieved without using any other connection method, which is advantageous in simplifying the structure of the casing assembly 1 and the assembly process of the casing assembly 1.

[0112] Furthermore, because the pole body 12a, the first position limiting base 12b, and the second position limiting base 12c are integrally molded, not only do they save on materials and costs, but they also ensure the strength of the first pole 12. As a result, when the first pole 12 is fitted into the casing 11, the first pole 12 will not easily come off the casing 11 due to vibration or external pulling during the charging and discharging process of the battery cell 10, and is less likely to crack or be damaged by vibration or external pulling. This improves the stability and reliability of the casing assembly 1, and therefore the stability and reliability of the battery cell 10.

[0113] In the above technical solution, the casing assembly 1 may have one or more poles, at least one of which includes an integrally formed first pole 12. That is, all of the poles on the casing 11 may be integrally formed and include the first pole 12 riveted to the casing 11, or some of the poles on the casing 11 may be integrally formed and include the first pole 12 riveted to the casing 11, and the other poles may have a different non-integrally formed structure.

[0114] In some embodiments of the present application, reference is made to Figures 7 and 8. Figure 8 is a schematic assembly diagram of a first pole post and a first wall provided by some embodiments of the present application. When the cross section of the mounting hole 113 is defined as a projection plane Ω and the axial direction Z of the mounting hole 113 is defined as the projection direction, at least a portion of the circumferential profile R1 of the projection of the first position limiting base 12b on the projection plane Ω is a straight line (also called a straight line portion), and at least a portion of the circumferential profile R2 of the projection of the second position limiting base 12c on the projection plane Ω is a straight line (also called a straight line portion).

[0115] Specifically, referring to Figures 7 and 8, the plane indicated by the dashed line in Figure 7 is the projection plane Ω, which is perpendicular to the axial direction Z of the mounting hole 113. The first and second position limiting stages 12b and 12c can be located on opposite sides of the projection plane Ω in the axial direction Z. In this case, at least a portion of the circumferential profile R1 of the first position limiting stage 12b projected along the direction Z1 on the projection plane Ω is linear, and at least a portion of the circumferential profile R2 of the second position limiting stage 12c projected along the direction Z2 on the projection plane Ω is linear. The directions Z1 and Z2 are both parallel to the axial direction Z and opposite to each other. Of course, in other embodiments of the present application, at least a portion of the circumferential profile of either the first or second position limiting stage 12b or 12c projected along the axial direction Z can be linear, but this embodiment is not limited to this.

[0116] It is understood that the circumferential profile R1 of the projection of the first limiting stage 12b on the projection plane Ω can be understood as the circumferential profile of the projection of the first limiting stage 12b on the projection plane Ω, and this circumferential profile is a closed contour profile. The circumferential profile R2 of the projection of the second limiting stage 12c on the projection plane Ω can be understood as the circumferential profile of the projection of the second limiting stage 12c on the projection plane Ω, and this circumferential profile is also a closed profile line. The term "closed profile line" should be interpreted broadly and can refer to a curve whose start point and end point are connected.

[0117] If at least a portion of the circumferential profile R1 of the projection of the first position limiter 12b on the projection plane Ω is straight, the circumferential profile R1 may be composed of multiple straight lines, or the circumferential profile R1 may be composed of a combination of straight lines and curved lines. The number of straight lines included in the circumferential profile R1 of the projection of the first position limiter 12b on the projection plane Ω may be one or more. Similarly, if at least a portion of the circumferential profile R2 of the projection of the second position limiter 12c on the projection plane Ω is straight, the circumferential profile R2 may be composed of multiple straight lines (e.g., a polygon), or the circumferential profile R2 may be composed of a combination of straight lines and curved lines (the curved lines may include at least one of a circular arc, an elliptical arc, a hyperbola, a parabola, etc.). The number of straight lines included in the circumferential profile R2 of the projection of the second position limiter 12c on the projection plane Ω may be one or more.

[0118] Optionally, in the examples of Figures 7 to 11 and 15 to 18, the outer peripheral wall of the first position limiting table 12b is formed as a cylindrical surface, at least a part of which is flat, and / or the outer peripheral wall of the second position limiting table 12c is formed as a cylindrical surface, at least a part of which is flat. Of course, the shapes of the outer peripheral walls of the first position limiting table 12b and the second position limiting table 12c are not limited to these.

[0119] In the above technical proposal, the first position limiting base 12b and the second position limiting base 12c are parts that are riveted to the casing 11 after flanges are formed on both axial ends of the first pole post 12, so the first pole post 12 is riveted to the casing 11 by the first position limiting base 12b and the second position limiting base 12c. By setting at least a portion of the circumferential profile R1 of the projection of the first position limiter 12b on the projection plane Ω as a straight line, and by setting at least a portion of the circumferential profile R2 of the projection of the second position limiter 12c on the projection plane Ω as a straight line, the portions of the projection profile of the first position limiter 12b corresponding to the straight lines and the portions of the projection profile of the second position limiter 12c corresponding to the straight lines are subjected to a relatively smaller tensile force than the curved portions. As a result, the first position limiter 12b and / or the second position limiter 12c are less likely to crack after the first pole 12 is riveted, the strength of the first pole 12 is guaranteed, and the reliability and stability of the first pole 12 are improved, which in turn improves the reliability and stability of the battery cell 10. At the same time, if at least a portion of the first position limiting block 12b and the second position limiting block 12c is straight, they can fit into the conductive portion 22 of the sheet structure, allowing the conductive portion 22 to fully utilize the space of the first pole 12, thereby fully improving the space utilization rate of the first pole 12 and ensuring the energy density and fast charging performance of the battery cell 10. Furthermore, the outer peripheral profile of the first position limiting block 12b and the second position limiting block 12c can be easily simplified, reducing the difficulty of processing the first position limiting block 12b and the second position limiting block 12c.

[0120] In some embodiments of the present application, referring to Figures 12 to 14, when the cross section of the mounting hole 113 is the projection plane Ω and the axial direction Z of the mounting hole 113 is the projection direction, the circumferential profile R1 of the projection of the first position limiting base 12b on the projection plane Ω is composed of one or a combination of multiple curves.

[0121] 7 and 12 to 14, the axial direction Z of the mounting hole 113 is defined as the third direction Z, the plane on which the cross section of the mounting hole 113 is located is defined as the projection plane Ω, the projection plane Ω is perpendicular to the third direction Z, and the first position limiting base 12b is projected onto the projection plane Ω along the third direction Z. In this case, the circumferential profile R1 of the projection of the first position limiting base 12b onto the projection plane Ω is formed only by curves, and the circumferential profile R1 may be, for example, an ellipse. The dimension L1 in the first direction X may be greater than the dimension L2 in the second direction Y, and / or the dimension L3 in the first direction X of the circumferential profile R2 may be greater than the dimension L4 in the second direction Y, so that when the second position limiting table 12c is projected along the third direction Z onto the projection plane Ω, the circumferential profile R2 of the projection of the second position limiting table 12c on the projection plane Ω consists only of curves and may be, for example, elliptical.

[0122] In some embodiments of the present application, with reference to Figures 7 to 11 and Figures 15 to 18, the cross section of the mounting hole 113 is defined as the projection plane Ω, the axial direction Z of the mounting hole 113 is defined as the projection direction, and the circumferential profile R1 of the projection of the first position limiting base 12b on the projection plane Ω is composed of straight lines and arc lines, and / or the circumferential profile R2 of the projection of the second position limiting base 12c on the projection plane Ω is composed of straight lines and arc lines.

[0123] As will be understood, the circumferential profile R1 of the projection on the projection plane Ω of the first position limiter 12b may include one or more straight lines and one or more arc lines, which may be equal to or different from the number of straight lines and arc lines, while the circumferential profile R2 of the projection on the projection plane Ω of the second position limiter 12c may include one or more straight lines and one or more arc lines, which may be equal to or different from the number of straight lines and arc lines. Among them, adjacent straight lines and arc lines in the circumferential profile R1 and the circumferential profile R2 may be tangent or intersect.

[0124] For example, taking the circumferential profile R1 of the first position limiter 12b on the projection plane Ω as an example, the circumferential profile R1 may be formed by a combination of one straight line and one arc line so that the figure enclosed by the circumferential profile R1 is an arch, or may be formed by a combination of two straight lines and one arc line so that the figure enclosed by the circumferential profile R1 is a sector, or may be formed by a combination of three straight lines and one arc line so that the figure enclosed by the circumferential profile R1 is a figure combining a semicircle and a rectangle. The circumferential profile R2 of the second position limiter 12c on the projection plane Ω will not be described here.

[0125] In the above technical proposal, the first position limiting base 12b and the second position limiting base 12c are parts that are riveted to the casing 11 after flanges are formed on both axial ends of the first pole post 12, so the first pole post 12 is riveted to the casing 11 by the first position limiting base 12b and the second position limiting base 12c. By arranging the circumferential profile R1 of the projection of the first position limiter 12b on the projection plane Ω to be a combination of straight lines and arc lines, and / or by arranging the circumferential profile R2 of the projection of the second position limiter 12c on the projection plane Ω to be a combination of straight lines and arc lines, the portions of the projection profile of the first position limiter 12b corresponding to the straight lines and / or the portions of the projection profile of the second position limiter 12c corresponding to the straight lines are subjected to a relatively smaller tensile force than the curved portions. As a result, the first position limiter 12b and / or the second position limiter 12c are less likely to crack after the first pole 12 is riveted, the strength of the first pole 12 is guaranteed, and the reliability and stability of the first pole 12 are improved, which in turn improves the reliability and stability of the battery cell 10. Furthermore, the portion of the first position limiting base 12b that corresponds to the arc of the projected profile and / or the portion of the second position limiting base 12c that corresponds to the arc of the projected profile can improve the smoothness of riveting the first pole 12 to the casing 11, and also function as a connection between the straight portion and the arc portion, further ensuring the strength of the first pole 12 and further improving the reliability and stability of the battery cell 10.

[0126] 7, 10, 11, and 15, the cross section of the mounting hole 113 is defined as the projection plane Ω, and the axial direction Z of the mounting hole 113 is defined as the projection direction. The circumferential profile R1 of the projection of the first position limiting table 12b on the projection plane Ω includes two straight lines and two arc lines, the two straight lines being spaced apart and opposite ends of the two straight lines connected by an arc line. The circumferential profile R2 of the projection of the second position limiting table 12c on the projection plane Ω includes two straight lines and two arc lines, the two straight lines being spaced apart and opposite ends of the two straight lines connected by an arc line. Of course, in other embodiments, the circumferential profile of only one of the first position limiting table 12b or the second position limiting table 12c projected on the projection plane Ω may include two straight lines and two arc lines, but this is not a limitation of the present embodiments.

[0127] 11 , for example, the circumferential profile R1 of the projection of the first position limiting table 12b on the projection plane Ω can be represented as follows: The circumferential profile R1 is composed of two straight lines and two arc lines. The two straight lines are parallel and spaced apart, and the ends of the two straight lines are aligned. That is, the lengths of the two straight lines are equal. One end of one straight line is connected to one end of the other straight line via an arc line, and the other end of the first straight line is connected to the other end of the other straight line via another arc line. Thus, the circumferential profile R1 forms a racetrack-shaped closed curve. Alternatively, the radii of the two arc lines are equal, and each straight line is tangent to each arc line, forming the racetrack-shaped circumferential profile R1. Of course, the two straight lines can be non-parallel, the lengths of the two straight lines can be unequal, the radii of the two arc lines can be unequal, and each straight line can intersect with the arc lines.

[0128] As can be understood, the circumferential profile R2 of the projection of the second position limiting table 12c on the projection plane Ω can also be formed into the above-mentioned shape, and the explanation thereof will be omitted here.

[0129] In the above technical solution, the circumferential profiles of the projections of the first position limiting base 12b and the second position limiting base 12c on the projection plane Ω are set so that they each include two straight lines and two arcs. This ensures that the portions of the projection profile of the first position limiting base 12b that correspond to the straight lines and the portions of the projection profile of the first position limiting base 12b that correspond to the curved lines have an appropriate ratio, and that the portions of the projection profile of the second position limiting base 12c that correspond to the straight lines and the portions of the projection profile of the second position limiting base 12c that correspond to the curved lines have an appropriate ratio. This further improves the strength of the first pole 12 and the smoothness of the rivet joint, thereby improving the reliability and stability of the battery cell 10.

[0130] Therefore, in the embodiment of the present application, as shown in Figures 8 to 18, the circumferential profile R1 of the projection of the first position limiting base 12b on the projection surface Ω can have a shape that is polygonal, circular, elliptical, or a combination of straight lines and arc lines, the circumferential profile of the projection of the polar pillar main body 12a on the projection surface Ω can also have a shape that is polygonal, circular, elliptical, or a combination of straight lines and arc lines, and the circumferential profile R2 of the projection of the second position limiting base 12c on the projection surface Ω can also have a shape that is polygonal, circular, elliptical, or a combination of straight lines and arc lines.

[0131] As will be understood, the shapes of the circumferential profile R1 of the projection of the first position limiting table 12b on the projection plane Ω, the circumferential profile R2 of the projection of the pole pillar body 12a on the projection plane Ω, and the circumferential profile R2 of the projection of the second position limiting table 12c on the projection plane Ω may be homologous or different.

[0132] In the above technical solutions, the polygon can be broadly interpreted, and the side angles of the polygon may be acute angles or rounded angles.

[0133] In some embodiments of the present application, as shown in Figures 8 to 18, the cross section of the mounting hole 113 is defined as a projection plane Ω, and the axial direction Z of the mounting hole 113 is defined as the projection direction. The dimension L1 of the first position limiting base 12b projected on the projection plane Ω in the first direction X is greater than the dimension L2 of the first position limiting base 12b projected on the projection plane Ω in the second direction Y. The dimension L3 of the second position limiting base 12c projected on the projection plane Ω in the first direction X is greater than the dimension L4 of the second position limiting base 12c projected on the projection plane Ω in the second direction Y. The first direction X, the second direction Y, and the axial direction are all perpendicular to each other. Of course, in other embodiments, it is possible to satisfy only one of the conditions L1 > L2 and L3 > L4, and this embodiment is not limited to this.

[0134] Among these, the dimension L1 in the first direction X of the projection of the first position limiting table 12b on the projection surface Ω can be understood to be the maximum dimension in the first direction X of the projection of the first position limiting table 12b on the projection surface Ω, the dimension L2 in the second direction Y of the projection of the first position limiting table 12b on the projection surface Ω can be understood to be the maximum dimension in the second direction Y of the projection of the first position limiting table 12b on the projection surface Ω, the dimension L3 in the first direction X of the projection of the second position limiting table 12c on the projection surface Ω can be understood to be the maximum dimension in the first direction X of the projection of the second position limiting table 12c on the projection surface Ω, and the dimension L4 in the second direction Y of the projection of the second position limiting table 12c on the projection surface Ω can be understood to be the maximum dimension in the second direction Y of the projection of the second position limiting table 12c on the projection surface Ω.

[0135] In the above technical solution, the dimension L1 of the first position limiting base 12b in the first direction X of the projection on the projection plane Ω is set larger than the dimension L' of the first pole 12 in the second direction Y, and the dimension L3 of the second position limiting base 12c in the first direction X of the projection on the projection plane Ω is set larger than the dimension L' of the first pole 12 in the second direction Y. This allows the first position limiting base 12b and the second position limiting base 12c to be formed elongated, which increases the fitting length between the first pole 12 and the casing 11 and also increases the length of the riveted joint between the first pole 12 and the casing 11, thereby improving the stability and reliability of the riveted joint between the first pole 12 and the casing 11 and further improving the stability and reliability of the battery cell 10.

[0136] As can be understood, in the above technical solution of the present application, the cross section of the mounting hole 113 is the projection plane Ω, the axial direction Z of the mounting hole 113 is the projection direction, and the projection shape of the first position limiting base 12b on the projection plane Ω and the projection shape of the second position limiting base 12c on the projection plane Ω may be identical or different.

[0137] In some embodiments of the present application, as shown in Figures 8 to 18, the dimension L1 in the first direction of the projection of the first position limiting base 12b on the projection surface Ω is greater than three times the dimension L2 in the second direction of the projection of the first position limiting base 12b on the projection surface Ω, and the dimension L3 in the first direction of the projection of the second position limiting base 12c on the projection surface Ω is greater than three times the dimension L4 in the second direction of the projection of the second position limiting base 12c on the projection surface Ω. In particular, when the cross section of the first pole 12 is parallel to the cross section of the mounting hole 113, the projection surface Ω can be used as the cross section of the first pole 12. Of course, in other embodiments, it is possible to satisfy only one of the conditions L1 > 3 × L2 and L3 > 3 × L4, and this embodiment is not limited to this.

[0138] Alternatively, L1 may be 3×L2, 3.3×L2, 3.5×L2, 3.8×L2, or 4×L2, etc., and L3 may be 3×L3, 3.2×L3, 3.5×L3, 3.9×L3, or 4×L3, etc.

[0139] In the above technical solution, the dimension in the first direction X of the projection of the first position limiting block 12b and / or the second position limiting block 12c on the projection plane Ω is at least three times the dimension in the second direction Y of the projection of that block on the projection plane Ω. This is applicable when the length in the first direction X of the wall on the casing 11 on which the first pole 12 is installed is relatively long, and the dimension of the wall on the casing on which the first pole 12 is installed can be fully utilized, i.e., the area of ​​the wall on which the first pole 12 can be installed can be fully utilized, the riveting area between the first pole 12 and the casing 11 can be increased, and the riveting strength between the first pole 12 and the casing 11 can be improved, thereby further improving the reliability and stability of the battery cell 10.

[0140] Furthermore, the above-described installation of the first pole 12 allows the cross-sectional area of ​​the first pole 12 to be enlarged within the limited placement area of ​​the corresponding wall of the casing 11, making it easy for the first pole 12 to form a "super large pole structure", which further increases the current passing area, current passing capacity, and heat diffusion capacity of the first pole 12, and ensures the rapid charging performance of the battery cell 10.

[0141] Obviously, in the above technical solution, the first pole 12 has an elongated dimension, which is particularly suitable for a battery cell 10 with a thin structure, and is advantageous for improving the compactness of the battery cell 10 structure.

[0142] In some embodiments of the present application, as shown in FIGS. 3 and 4, the first direction X is the length direction of the first wall 110, the second direction Y is the width direction of the first wall 110, and the length a0 of the first wall 110 is greater than the width b0 of the first wall 110.

[0143] In the above technical solution, the first direction X is set as the length direction of the first wall 110, and the second direction Y is set as the width direction of the first wall 110, so that the length direction of the first wall 110 coincides with the length direction of the cross section of the first position limiting table 12b, the width direction of the first wall 110 coincides with the width direction of the cross section of the first position limiting table 12b, and / or the length direction of the first wall 110 coincides with the length direction of the cross section of the second position limiting table 12c, and the width direction of the first wall 110 coincides with the width direction of the cross section of the second position limiting table 12c. This effectively achieves good matching between the first wall 110 and the first pole 12 on the first wall 110 in both the first direction X and the second direction Y, and allows the first pole 12 on the first wall 110 to further make full use of the arrangement area provided by the first wall 110, increasing the rivet joint area between the first pole 12 and the casing 11 and improving the rivet joint strength between the first pole 12 and the casing 11, thereby improving the reliability and stability of the battery cell.

[0144] For example, by installing a plurality of first poles 12 on the first wall 110 and arranging the plurality of first poles 12 at intervals along the first direction X, the arrangement direction of the plurality of first poles 12 matches the length direction of the first wall 110, and by setting the length and width of the first wall 110, the requirement that "the dimension required for the plurality of first poles 12 in the first direction X exceeds the dimension required for the second direction Y" can be satisfied, and an appropriate interval can be provided between two adjacent first poles 12. Further, for example, the plurality of first pole poles 12 on the first wall 110 can be installed at intervals along the first direction X and the second direction Y. In this case, the plurality of first pole poles 12 installed at intervals along the first direction X constitute one pole pole group, and there are a plurality of pole pole groups, and the plurality of pole pole groups are installed at intervals along the second direction Y, so that the arrangement of the plurality of first pole poles 12 can also match the first direction X and the second direction Y of the first wall 110. Of course, one first pole pole 12 can also be installed on the first wall 110.

[0145] In some embodiments of the present application, as shown in FIGS. 7 to 9 , the length dimension L5 of the pole body 12a in the first direction X is equal to or greater than 1 / 3 of the length dimension a0 of the first wall 110 in the first direction X, for example, L5 may be a0 / 3, 2×a0 / 5, or 9×a0 / 20, and the width dimension L6 of the pole body 12a in the second direction Y is equal to or greater than 1 / 4 of the width dimension b0 of the first wall 110 in the second direction Y, for example, L6 may be b0 / 4, b0 / 3, or 2×b0 / 5. The cross-sectional area of ​​the portion where the body 12a and the mounting hole 113 are fitted is 4% or more of the area of ​​the first wall 110, for example, the cross-sectional area of ​​the portion where the pole body 12a and the mounting hole 113 are fitted may be 4%, 4.5%, 5%, or 5.4% of the area of ​​the first wall 110, and the ratio of the thickness dimension t of the pole body 12a to the thickness dimension t0 of the first wall 110 along the axial direction Z of the mounting hole 113 is greater than 1 and less than 1.5, for example, the ratio may be 1.1, 1.15, 1.2, 1.3, 1.35, or 1.4. It should be understood that in other embodiments, only some of the above conditions may be satisfied, and this embodiment is not limited thereto.

[0146] In the above technical solution, when at least one of the ratio of the length of the post body 12a to the length of the first wall 110 or the ratio of the width of the post body 12a to the width of the first wall 110 satisfies the corresponding range, the post body 12a takes up a large proportion of the first wall 110 in the length and width directions, and the dimensions of the fitting portion between the post body 12a and the mounting hole 113 are also large, thereby improving the stability of the riveted joint between the first post 12 and the first wall 110, ensuring the riveted joint strength of the first post 12, and improving the reliability and stability of the battery cell 10. When the ratio of the cross-sectional area of ​​the post body 12a to the area of ​​the first wall 110 is within the above range, the current passing area of ​​the first post 12 is large, which improves the current passing capacity and fast charging capacity of the first post 12 and is advantageous to improving the heat diffusion capacity of the first post 12. When the ratio of the thickness of the terminal post body 12a to the thickness of the first wall 110 satisfies the above corresponding range, the terminal post body 12a can be easily fitted securely into the mounting hole 113, the first position limiting block 12b and the second position limiting block 12c are respectively arranged inside and outside the casing 11, the first terminal post 12 can be smoothly riveted, and the convenience and reliability of riveting can be improved. At the same time, when all the parameters of the terminal post body 12a are within the above range, the number of first terminal posts 12 of the same polarity on the first wall 110 can be one or more, in particular two, and the two first terminal posts 12 are spaced apart along the second direction Y, and of course the number of first terminal posts 12 of the same polarity can be four.

[0147] As will be understood, in the embodiments of the present application, the area S0 of the first wall 110 can be understood as the projected area of ​​the first wall 110 on the projection plane Ω, for example, when the first wall 110 forms a substantially rectangular structure, the area S0 of the first wall 110 can be simply understood as (a0 × b0 - the opening area of ​​all mounting holes 113 in the first wall 110), and the thickness dimension t0 of the first wall 110 can be understood as the thickness of the edge portion of the first wall 110 that surrounds the mounting holes 113.

[0148] Alternatively, the cross-sectional area of ​​the portion where the pole body 12a and the mounting hole 113 are fitted together may be 5.8% or more of the area of ​​the first wall 110. For example, the cross-sectional area of ​​the portion where the pole body 12a and the mounting hole 113 are fitted together may be 5.8%, 6%, 6.6%, 7%, or 8.6% of the area of ​​the first wall 110, thereby further ensuring the rivet joint strength between the first pole 12 and the casing 11.

[0149] Optionally, the length dimension L5 of the pole body 12a in the first direction X is 40 mm or more, for example, L5 can be 45 mm, 48 mm, 50 mm, or 55 mm, and the width dimension L6 of the pole body 12a in the second direction Y is 7.5 mm or more, for example, L6 The cross-sectional area of ​​the portion where the pole body 12a and the mounting hole 113 are fitted is 600 mm. 2 For example, the cross-sectional area of ​​the portion where the pole body 12a and the mounting hole 113 fit together is 600 mm 2 , 640mm 2 , 660mm 2 , or 700mm 2 etc.

[0150] 14 to 18, four mounting holes 113 are formed on the first wall 110, and four first poles 12 are installed in the four mounting holes 113, respectively. That is, one first pole 12 can be installed in each mounting hole 113, and the four first poles 12 have the same polarity, two of which are positive poles, and the other two are negative poles. Among them, each first pole 12 satisfies at least one of the following conditions: the length dimension L5 of the pole body 12a in the first direction X is equal to or greater than 1 / 3 of the length dimension a0 of the first wall 110 in the first direction X; the width dimension L6 of the pole body 12a in the second direction Y is equal to or greater than 1 / 4 of the width dimension b0 of the first wall 110 in the second direction Y; the cross-sectional area of ​​the portion where the pole body 12a and the mounting hole 113 fit together is 4% or greater of the area of ​​the first wall 110; and the thickness dimension t of the pole body 12a along the axial direction Z of the mounting hole 113 is equal to or greater than 0.6 of the thickness dimension t0 of the first wall 110 and equal to or less than 1.5 of the thickness dimension t0 of the first wall.

[0151] In some embodiments of the present application, as shown in FIGS. 7 to 9 , a length dimension L5 of the pole body 12a in the first direction X is equal to or greater than 1 / 3 of a length dimension a0 of the first wall 110 in the first direction X, and for example, L5 may be a0 / 3, 0.35×a0, or 0.42×a0, etc.; a width dimension L6 of the pole body 12a in the second direction Y is equal to or greater than 1 / 2 of a width dimension b0 of the first wall 110 in the second direction Y, and for example, L6 may be b0 / 2, 0.55×b0, 0.6×b0, or 0.68×b0, etc.; and a circumferential length in the circumferential direction in which the pole body 12a and the mounting hole 113 are fitted together is equal to or greater than 25% of a circumferential length of the first wall 110, and for example, The circumferential length of the portion into which the mounting hole 113 fits may be 25%, 25.8%, 26%, or 26.6% of the circumferential length of the first wall 110, for example; the cross-sectional area of ​​the portion where the pole body 12a and the mounting hole 113 fit may be 10% or more of the area of ​​the first wall 110, for example, the cross-sectional area of ​​the portion where the pole body 12a and the mounting hole 113 fit may be 10%, 10.6%, 11%, 11.5%, or 12% of the area of ​​the first wall 110, for example; and the ratio of the thickness dimension t of the pole body 12a to the thickness dimension t0 of the first wall 110 along the axial direction Z of the mounting hole 113 may be greater than 1 and less than 1.5, for example, the ratio may be 1.1, 1.15, 1.2, 1.3, 1.35, or 1.4, for example. It is understood that in other embodiments, only some of the above conditions may be met, and this embodiment is not limited thereto.

[0152] In the above technical solution, when at least one of the ratio between the length of the pole body 12a and the length of the first wall 110, the ratio between the width of the pole body 12a and the width of the first wall 110, and the ratio between the perimeter of the fitting between the pole body 12a and the mounting hole 113 and the perimeter of the first wall 110 satisfies the above corresponding range, the pole body 12a occupies a large proportion of the first wall 110 in the length and width directions and the dimensions of the fitting portion between the pole body 12a and the mounting hole 113 are large, thereby improving the stability of the riveting joint between the first pole 12 and the first wall 110, ensuring the riveting strength of the first pole 12, and improving the reliability and stability of the battery cell 10. When the ratio of the cross-sectional area of ​​the pole body 12a to the area of ​​the first wall 110 is within the above range, the current passing area of ​​the first pole 12 is large, and the current passing capacity and rapid charging capacity of the first pole 12 can be improved. When the ratio of the thickness of the pole body 12a to the thickness of the first wall 110 satisfies the above corresponding range, the pole body 12a can be securely fitted into the mounting hole 113, so that the first position limiting base 12b and the second position limiting base 12c are located inside and outside the casing 11, respectively, and the first pole 12 can be riveted smoothly, improving the convenience and reliability of the riveting. At the same time, when all the parameters of the pole body 12a are within the above ranges, the number of the first pole poles 12 of the same polarity in the first wall 110 can be one or more, particularly two, and the two first pole poles 12 are spaced apart along the second direction Y, and of course, the number of the first pole poles 12 of the same polarity can also be four.

[0153] As will be understood, in the present embodiment, the perimeter of the first wall 110 can be understood as the perimeter of the peripheral profile of the projection of the first wall 110 on the projection plane Ω, for example, if the first wall 110 forms an approximately rectangular structure, and the peripheral profile of the projection of the first wall 110 on the projection plane Ω is also an approximately rectangular structure, the perimeter of the first wall 110 can be simply understood as (2×a0+2×b0).

[0154] Alternatively, the circumferential length of the fitting between the pole body 12a and the mounting hole 113 may be 26.5% or more of the circumferential length of the first wall 110. For example, the circumferential length of the fitting between the pole body 12a and the mounting hole 113 may be 26.5%, 27%, 27.2%, 27.7%, or 28% of the circumferential length of the first wall 110, which can further ensure the length of the rivet joint between the first pole 12 and the casing 11 and improve the reliability of the rivet joint.

[0155] Optionally, the circumferential length of the pole body 12a and the mounting hole 113 fitted together is 40% or less of the circumferential length of the first wall 110, thereby achieving both the reliability of use of the first wall 110 and the reliability of the rivet joint between the first pole body 12a and the casing 11, on the premise that this improves the reliability.

[0156] Alternatively, the cross-sectional area of ​​the portion where the pole body 12a and the mounting hole 113 are fitted together may be 11.6% or more of the area of ​​the first wall 110. For example, the cross-sectional area of ​​the portion where the pole body 12a and the mounting hole 113 are fitted together may be 11.6%, 12%, 12.4%, 12.7%, or 13.8% of the area of ​​the first wall 110, which can further ensure the fitting area of ​​the rivet joint between the first pole 12 and the casing 11 and improve the reliability of the rivet joint.

[0157] Alternatively, the length dimension L5 of the pole body 12a in the first direction X is 40 mm or more, for example, L5 may be 40 mm, 43 mm, 46 mm, 50 mm, or 52 mm, etc., and the width dimension L6 of the pole body 12a in the second direction Y is 15 mm or more, for example, L6 The cross-sectional area of ​​the portion where the pole body 12a and the mounting hole 113 are fitted together is 600 mm. 2 For example, the cross-sectional area of ​​the portion where the pole body 12a and the mounting hole 113 fit together is 600 mm 2 , 630mm 2 , 680mm 2 , or 700mm 2 And so on.

[0158] 8 to 13, two mounting holes 113 are formed on the first wall 110, and one first pole 12 is installed in each mounting hole 113. The polarities of the two first poles 12 are opposite to each other, and each first pole 12 satisfies the following conditions: the length dimension L5 of the pole body 12a in the first direction X is 1 / 3 or more of the length dimension a0 of the first wall 110 in the first direction X; the width dimension L6 of the pole body 12a in the second direction Y is 1 / 3 or more of the length dimension a0 of the first wall 110 in the first direction X; At least one of the following is satisfied: the width dimension b0 in the second direction Y is equal to or greater than 1 / 2; the circumferential length in the circumferential direction where the pole body 12a and the mounting hole 113 fit together is equal to or greater than 25% of the circumferential length of the first wall 110; the cross-sectional area of ​​the portion where the pole body 12a and the mounting hole 113 fit together is equal to or greater than 10% of the area of ​​the first wall 110; and the ratio of the thickness dimension t of the pole body 12a to the thickness dimension t0 of the first wall 110 along the axial direction Z of the mounting hole 113 is greater than 1 and less than 1.5.

[0159] In some embodiments of the present application, as shown in FIGS. 7 to 9 , the length dimension L1 of the first position limiting table 12b in the first direction X is equal to or greater than 1 / 3 of the length dimension a0 of the first wall 110 in the first direction X. For example, L1 may be a0 / 3, 0.36×a0, 0.41×a0, or 0.44×a0, and the width dimension L2 of the first position limiting table 12b in the second direction Y is equal to or greater than 1 / 4 of the width dimension b0 of the first wall 110 in the second direction Y. For example, L2 may be 0.25×b0, 0.3×b0, 0.34×b0, or 0.4×b0, and the cross-sectional area of ​​the first position limiting table 12b ... is 4.5% or more of the area of ​​the first wall 110, for example, the cross-sectional area S1 of the first position limiting base 12b may be 4.5%, 4.8%, 5%, 6%, or 8%, etc., of the area S0 of the first wall 110, the cross-sectional area of ​​the first position limiting base 12b is perpendicular to the axial direction Z of the mounting hole 113, and along the axial direction Z of the mounting hole 113, the thickness dimension t1 of the first position limiting base 12b is 0.6 or more times the thickness dimension t0 of the first wall 110 and 1.5 or less times the thickness dimension t0 of the first wall 110, for example, t1 may be 0.6 × t0, 0.7 × t0, 0.8 × t0, 1 × t0, 1.3 × t0, or 1.5 × t0, etc. It will be understood that in other embodiments, only some of the above conditions may be satisfied, and this embodiment is not limited thereto.

[0160] In the above technical solution, when at least one of the ratio between the length of the first position limiting base 12b and the length of the first wall 110 and the ratio between the width of the first position limiting base 12b and the width of the first wall 110 satisfies the above corresponding range, the proportion of the first position limiting base 12b in the length and width directions of the first wall 110 is large, and the dimensions of the fitting portion between the first position limiting base 12b and the mounting hole 113 are large, thereby improving the stability of the rivet joint between the first pole 12 and the first wall 110, ensuring the rivet joint strength of the first pole 12, and improving the reliability and stability of the battery cell 10. When the ratio of the cross-sectional area of ​​the first position limiting base 12b to the area of ​​the first wall 110 is within the above range, the current passing area of ​​the first pole 12 is large, and the current passing capacity and fast charging capacity of the first pole 12 can be improved. When the ratio of the thickness of the first position limiting base 12b to the thickness of the first wall 110 satisfies the above corresponding range, the first pole 12 is prevented from easily separating from the first wall 110, and the reliability of the rivet joint can be further improved. In addition, it is advantageous to reduce the thickness of the part of the first position limiting base 12b that protrudes outside the casing 11, which reduces the space occupied by the first pole 12 outside the casing 11 and is advantageous to improve the volumetric energy density of the battery 100. At the same time, when all the parameters of the first position limiting base 12b are within the above ranges, the number of first pole pillars 12 of the same polarity on the first wall 110 may be one or more, particularly may be two, and the two first pole pillars 12 are installed at intervals along the second direction Y, and of course, the number of first pole pillars 12 of the same polarity may be four.

[0161] Optionally, the length L1 of the first position limiting base 12b in the first direction X is equal to or less than half the length a0 of the first wall 110 in the first direction X, i.e., a0 / 3≦L1≦a0 / 2, thereby improving the stability of the riveted joint between the first terminal post 12 and the casing 11 and achieving both reliability in use of the first wall 110 and consistency in the number of terminal posts 12 to be arranged on the first wall 110. For example, L1 may be 0.35×a0, 0.4×a0, 0.46×a0, 0.5×a0, etc.

[0162] Alternatively, the width L2 of the first position limiting base 12b in the second direction Y is 3 / 8 or less of the width b0 of the first wall 110 in the second direction Y, i.e., b0 / 4≦L2≦3×b0 / 8, which similarly improves the stability of the riveted joint between the first terminal posts 12 and the casing 11, thereby achieving both reliability in use of the first wall 110 and consistency in the number of terminal posts 12 to be arranged on the first wall 110. For example, L2 may be 0.28×b0, 0.32×b0, 0.35×b0, or 0.375×b0.

[0163] Alternatively, the cross-sectional area S1 of the first position limiting block 12b is 12.5% ​​or less of the area S0 of the first wall 110, i.e., 4.5%×S0≦S1≦12.5%×S0, thereby improving the reliability of the riveted joint between the first terminal post 12 and the casing 11 and simultaneously achieving the reliability of use of the first wall 110. For example, S1 may be 4.7%×S0, 5.2%×S0, 6.8%×S0, 7.6%×S0, 9%×S0, 10.5%×S0, 11%×S0, 11.6%×S0, 12%×S0, or 12.5%×S0.

[0164] 14 to 18, four mounting holes 113 are formed on the first wall 110, and four first poles 12 are installed in each of the four mounting holes 113, i.e., one first pole 12 can be installed in each mounting hole 113, and the four first poles 12 have the same polarity, two of which are positive poles and the other two are negative poles. Among them, each first pole post 12 satisfies at least one of the following conditions: the length dimension L1 of the first position limiting base 12b in the first direction X is 1 / 3 or more of the length dimension a0 of the first wall 110 in the first direction X; the width dimension L2 of the first position limiting base 12b in the second direction Y is 1 / 4 or more of the width dimension b0 of the first wall 110 in the second direction Y; the cross-sectional area of ​​the first position limiting base 12b is 4.5% or more of the area of ​​the first wall 110; and the thickness dimension t1 of the first position limiting base 12b along the axial direction Z of the mounting hole 113 is 0.6 or more of the thickness dimension t0 of the first wall 110 and 1.5 or less of the thickness dimension t0 of the first wall 110.

[0165] In some embodiments of the present application, as shown in FIGS. 7 to 9 , the length dimension L1 of the first position limiting table 12b in the first direction X is equal to or greater than 1 / 3 of the length dimension a0 of the first wall 110 in the first direction X. For example, L1 may be a0 / 3, 0.34×a0, 0.4×a0, or 0.45×a0. The width dimension L2 of the first position limiting table 12b in the second direction Y is equal to or greater than 1 / 2 of the width dimension b0 of the first wall 110 in the second direction Y. For example, L2 may be 0.5×b0, 0.52×b0, or 0.55×b0. , or 0.58×b0, the first position limiting stand 12b is columnar, and the circumferential dimension of the outer periphery of the first position limiting stand 12b is 30% or more of the circumferential dimension of the first wall 110, for example, 30%, 35%, 38%, 40%, 42%, 46%, 48%, or 52% of the circumferential dimension of the first wall 110, the cross-sectional area S1 of the first position limiting stand 12b is 9% or more of the area S0 of the first wall 110, and the cross-sectional area of ​​the first position limiting stand 12b is perpendicular to the axial direction Z of the mounting hole 113, , takeAlong the axial direction Z of the attachment hole 113, the thickness dimension t1 of the first position limiting base 12b is 0.6 or more times the thickness dimension t0 of the first wall 110, and t1 is 1.5 or less times the thickness dimension t0 of the first wall 110. For example, t1 may be 0.6 x t0, 0.7 x t0, 0.8 x t0, 1 x t0, 1.3 x t0, or 1.5 x t0, etc. It should be understood that in other embodiments, only some of the above conditions may be satisfied, and this embodiment is not limited thereto.

[0166] In the above technical solution, when at least one of the ratio of the length of the first position limiting base 12b to the length of the first wall 110, the ratio of the width of the first position limiting base 12b to the width of the first wall 110, and the ratio of the perimeter of the first position limiting base 12b to the perimeter of the first wall 110 satisfies the above corresponding range, the proportion of the first position limiting base 12b in the length and width directions of the first wall 110 is large, and the dimensions of the fitting portion between the first position limiting base 12b and the mounting hole 113 are large, thereby improving the stability of the riveting joint between the first pole 12 and the first wall 110, ensuring the riveting strength of the first pole 12, and improving the reliability and stability of the battery cell 10. When the ratio of the cross-sectional area of ​​the first position limiting base 12b to the area of ​​the first wall 110 is within the above range, the current passing area of ​​the first pole 12 is large, and the current passing capacity and fast charging capacity of the first pole 12 can be improved. When the ratio of the thickness of the first position limiting base 12b to the thickness of the first wall 110 satisfies the above corresponding range, the first pole 12 is prevented from easily separating from the first wall 110, and the reliability of the rivet joint can be further improved. In addition, it is advantageous to reduce the thickness of the part of the first position limiting base 12b that protrudes outside the casing 11, which reduces the space occupied by the first pole 12 outside the casing 11, and is advantageous to improve the volumetric energy density of the battery 100. At the same time, when all the parameters of the first position limiting base 12b are within the above ranges, the number of first pole pillars 12 of the same polarity on the first wall 110 may be one or more, particularly may be two, and the two first pole pillars 12 are installed at intervals along the second direction Y, and of course, the number of first pole pillars 12 of the same polarity may be four.

[0167] In the above technical solution, the first position limiting base 12b is columnar, which may refer to the first position limiting base 12b being a solid columnar shape, or may refer to the first position limiting base 12b being a solid columnar shape. In this case, the first position limiting base 12b has a through-hole penetrating along the axial direction Z of the mounting hole 113 (for example, as described later, the receiving portion 121 is formed in the first position limiting base 12b), which is advantageous in reducing the weight of the first pole post 12.

[0168] Optionally, the length L1 of the first position limiting base 12b in the first direction X is equal to or less than half the length a0 of the first wall 110 in the first direction X, i.e., a0 / 3≦L1≦a0 / 2, thereby improving the stability of the riveted joint between the first terminal post 12 and the casing 11 and achieving both reliability in use of the first wall 110 and consistency in the number of terminal posts 12 to be arranged on the first wall 110. For example, L1 may be 0.36×a0, 0.43×a0, 0.44×a0, 0.49×a0, etc.

[0169] Alternatively, the width dimension L2 in the second direction Y of the first position limiting base 12b is 3 / 4 or less of the width dimension b0 in the second direction Y of the first wall 110, i.e., b0 / 2≦L2≦3*b0 / 4, which similarly improves the stability of the riveted joint between the first terminal posts 12 and the casing 11, thereby achieving both the reliability of use of the first wall 110 and the consistency of the number of terminal posts 12 to be arranged on the first wall 110. For example, L2 may be 0.54×b0, 0.56×b0, 0.6×b0, 0.62×b0, 0.65×b0, 0.7×b0, 0.75×b0, etc.

[0170] Optionally, the first position limiting base 12b is columnar, and the circumferential length of the outer periphery of the first position limiting base 12b is 50% or less of the circumferential length of the first wall 110, thereby achieving both the reliability of use of the first wall 110 and the consistency of the number of terminal posts 12 to be arranged on the first wall 110, on the premise that the reliability of the riveting between the first terminal post 12 and the casing 11 is improved. For example, the circumferential length of the outer periphery of the first position limiting base 12b may be 32%, 37%, 40%, 45%, 49%, or 50% of the circumferential length of the first wall 110.

[0171] Alternatively, the cross-sectional area S1 of the first position limiting block 12b is 25% or less of the area S0 of the first wall 110, i.e., 9%×S0≦S1≦25%×S0, thereby improving the reliability of the riveted joint between the first terminal post 12 and the casing 11 and simultaneously achieving the reliability of use of the first wall 110. For example, S1 may 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.

[0172] 8 to 13, two mounting holes 113 are formed in the first wall 110, and one first pole 12 is installed in each mounting hole 113. The two first poles 12 have opposite polarities, and each first pole 12 satisfies the following conditions: the length dimension L1 of the first position limiting base 12b in the first direction X is 1 / 3 or more of the length dimension a0 of the first wall 110 in the first direction X; the width dimension L2 of the first position limiting base 12b in the second direction Y is 1 / 3 or more of the length dimension a0 of the first wall 110 in the second direction Y; the first position limiting base 12b is columnar and the circumferential dimension of the outer periphery of the first position limiting base 12b is 30% or more of the circumferential dimension of the first wall 110; the cross-sectional area S1 of the first position limiting base 12b is 9% or more of the area S0 of the first wall 110; and the thickness dimension t1 of the first position limiting base 12b along the axial direction Z of the mounting hole 113 is 0.6 or more times the thickness dimension t0 of the first wall 110 and is 1.5 or less times the thickness dimension t0 of the first wall 110.

[0173] In some embodiments of the present application, as shown in Figures 7 to 9, the length dimension L3 of the second position limiting table 12c in the first direction X is equal to or greater than 1 / 3 of the length dimension a0 of the first wall 110 in the first direction X. For example, the length dimension L3 of the second position limiting table 12c in the first direction X may be a0 / 3, 0.35*a0, 0.36*a0, 0.4×a0, 0.46×a0, or 0.52×a0, and the width dimension L4 of the second position limiting table 12c in the second direction Y is equal to or greater than 1 / 4 of the width dimension b0 of the first wall 110 in the second direction Y. For example, the width dimension L4 of the second position limiting table 12c in the second direction Y may be b0 / 4, 0.3×b0, 0.33×b0, 0.4×b0, 0.48×b0, etc. The cross-sectional area S2 of the second position limiter 12c is 4.5% or more of the area S0 of the first wall 110, for example, the cross-sectional area S2 of the second position limiter 12c is 4.5% × S0, 5% × S0, 5.4% × S0, 6% × S0, 7% × S0, etc., and the thickness dimension t2 of the second position limiter 12c along the axial direction Z of the mounting hole 113 is 0.6 or more times the thickness dimension t0 of the first wall 110 and 1.5 or less times the thickness dimension t0 of the first wall 110, for example, t2 may be 0.6 × t0, 0.7 × t0, 0.9 × t0, 1 × t0, 1.1 × t0, or 1.5 × t0, etc. It will be understood that in other embodiments, only some of the above conditions may be satisfied, and this embodiment is not limited thereto.

[0174] In the above technical solution, when at least one of the ratio of the length of the second position limiting block 12c to the length of the first wall 110 and the ratio of the width of the second position limiting block 12c to the width of the first wall 110 satisfies the corresponding range, the proportion of the second position limiting block 12c in the length and width directions of the first wall 110 is large, and the dimension of the fitting portion between the second position limiting block 12c and the mounting hole 113 is large, thereby improving the stability of the riveted connection between the first electrode post 12 and the first wall 110, ensuring the riveted connection strength of the first electrode post 12, and improving the reliability and stability of the battery cell 10. When the ratio of the cross-sectional area of ​​the second position limiting block 12c to the area of ​​the first wall 110 is within the above range, the current passing area of ​​the first electrode post 12 is large, thereby improving the current passing capacity and fast charging capability of the first electrode post 12. When the ratio of the thickness of the second position limiting block 12c to the thickness of the first wall 110 satisfies the above-mentioned corresponding range, the first pole 12 is prevented from being easily separated from the first wall 110, and the reliability of the rivet joint is further improved. 12c This is advantageous for reducing the thickness of the portion of the first electrode posts 12 protruding into the casing 11, reducing the space occupied by the first electrode posts 12 in the casing 11, and improving the volumetric energy density of the battery cell 10. At the same time, when all the parameters of the second position limiting base 12c are within the above ranges, the number of first electrode posts 12 of the same polarity on the first wall 110 may be one or more, in particular may be 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 may also be four.

[0175] Optionally, the length L3 of the second position limiting block 12c in the first direction X is equal to or less than half the length a0 of the first wall 110 in the first direction X, i.e., a0 / 3≦L3≦a0 / 2, thereby improving the stability of the riveted joint between the first terminal post 12 and the casing 11 and achieving both reliability in use of the first wall 110 and consistency in the number of terminal posts 12 to be arranged on the first wall 110. For example, L3 may be 0.35×a0, 0.4×a0, 0.46×a0, or 0.5×a0.

[0176] Optionally, the width dimension L4 in the second direction Y of the second position limiting base 12c is 3 / 8 or less of the width dimension b0 in the second direction Y of the first wall 110, i.e., b0 / 4≦L4≦3*b0 / 8, which similarly improves the stability of the riveted joint between the first terminal post 12 and the casing 11, thereby achieving both the reliability of use of the first wall 110 and the consistency of the number of terminal posts 12 to be arranged on the first wall 110. For example, L4 may be 0.28×b0, 0.32×b0, 0.35×b0, or 0.375×b0.

[0177] Alternatively, the cross-sectional area S2 of the second position limiting block 12c is 12.5% ​​or less of the circumferential area S0 of the first wall 110, i.e., 4.5%×S0≦S2≦12.5%×S0, thereby improving the reliability of the riveted joint between the first terminal post 12 and the casing 11 and simultaneously achieving the reliability of use of the first wall 110. For example, S2 may be 4.7%×S0, 5.2%×S0, 6.8%×S0, 7.6%×S0, 9%×S0, 10.5%×S0, 11%×S0, 11.6%×S0, 12%×S0, or 12.5%×S0.

[0178] 14 to 18, four mounting holes 113 are formed on the first wall 110, and four first poles 12 are installed in each of the four mounting holes 113, i.e., one first pole 12 can be installed in each mounting hole 113, and the four first poles 12 have the same polarity, two of which are positive poles and the other two are negative poles. Among them, each first pole post 12 satisfies at least one of the following conditions: the length dimension L3 in the first direction X of the second position limiting base 12c is 1 / 3 or more of the length dimension a0 in the first direction X of the first wall 110; the width dimension L4 in the second direction Y of the second position limiting base 12c is 1 / 4 or more of the width dimension b0 in the second direction Y of the first wall 110; the cross-sectional area of ​​the second position limiting base 12c is 4.5% or more of the area of ​​the first wall 110; and the thickness dimension t2 of the second position limiting base 12c along the axial direction Z of the mounting hole 113 is 0.6 or more of the thickness dimension t0 of the first wall 110 and 1.5 or less of the thickness dimension t0 of the first wall 110.

[0179] In some embodiments of the present application, as shown in FIGS. 7 to 9, the length dimension L3 of the second position limiting table 12c in the first direction X is 1 / 3 or more of the length dimension a0 of the first wall 110 in the first direction X. For example, the length dimension L3 of the second position limiting table 12c in the first direction X is a0 / 3, 0.35×a0, 0.4×a0, 0.42×a0, 0.47×a0, or 0.51×a0, etc. The width dimension L4 in the second direction Y is at least half of the width dimension b0 in the second direction Y of the first wall 110. For example, the width dimension L4 in the second direction Y of the second position limiting table 12c 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., and the second position limiting table 12c is columnar and the circumferential dimension of the outer periphery of the second position limiting table 12c is at least half of the width dimension b0 in the second direction Y of the first wall 110. The circumferential dimension of the outer periphery of the second position limiter 12c is 30% or more of the circumferential dimension of the first wall 110, for example, the circumferential dimension of the outer periphery of the second position limiter 12c is 0.3, 0.32, 0.35, 0.37, 0.4, 0.45, or 0.52 of the circumferential dimension of the first wall 110, and the cross-sectional area S2 of the second position limiter 12c is 9% or more of the area S0 of the first wall 110, for example, the cross-sectional area S2 of the second position limiter 12c is 9%×S0, 9.4%×S0, 9.9%×S0, 10.3%×S0, The thickness dimension t2 of the second position limiter 12c along the axial direction Z of the mounting hole 113 is 0.6 or more times the thickness dimension t0 of the first wall 110, and t2 is 1.5 or less times the thickness dimension t0 of the first wall 110, for example, t2 may be 0.6×t0, 0.72×t0, 0.8×t0, 1×t0, 1.2×t0, or 1.5×t0, etc. It will be understood that in other embodiments, only some of the above conditions may be satisfied, and this embodiment is not limited thereto.

[0180] In the above technical solution, when at least one of the ratio between the length of the second position limiting base 12c and the length of the first wall 110, the ratio between the width of the second position limiting base 12c and the width of the first wall 110, and the ratio between the perimeter of the outer periphery of the second position limiting base 12c and the perimeter of the first wall 110 satisfies the above corresponding range, the proportion of the second position limiting base 12c in the length and width directions of the first wall 110 is large, and the dimensions of the fitting portion between the second position limiting base 12c and the mounting hole 113 are large, thereby improving the stability of the rivet joint between the first pole 12 and the first wall 110, ensuring the rivet joint strength of the first pole 12, and improving the reliability and stability of the battery cell 10. When the ratio of the cross-sectional area of ​​the second position limiting block 12c to the area of ​​the first wall 110 is within the above range, the current passing area of ​​the first pole 12 is large, thereby improving the current passing capacity and fast charging capacity of the first pole 12; when the ratio of the thickness of the second position limiting block 12c to the thickness of the first wall 110 is within the above corresponding range, separation of the first pole 12 from the first wall 110 is easily avoided, further improving the reliability of the rivet joint; and 12c This is advantageous for reducing the thickness of the portion of the first electrode posts 12 protruding into the casing 11, reducing the space occupied by the first electrode posts 12 in the casing 11, and improving the volumetric energy density of the battery cell 10. At the same time, when all the parameters of the second position limiting base 12c are within the above ranges, the number of first electrode posts 12 of the same polarity on the first wall 110 may be one or more, in particular may be 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 may also be four.

[0181] In the above technical solution, the second position limiting table 12c is columnar, which may refer to a solid columnar shape or a hollow columnar shape. In this case, the second position limiting table 12c is oriented along the axial direction Z of the mounting hole 113. Second position limiter 12c The first pole 12 has a through-hole (for example, as described later, the receiving portion 121 is formed in the second position limiting base 12c), which is advantageous in reducing the weight of the first pole 12. do.

[0182] Optionally, the length L3 of the second position limiting block 12c in the first direction X is equal to or less than half the length a0 of the first wall 110 in the first direction X, i.e., a0 / 3≦L3≦a0 / 2, thereby improving the reliability of the first wall 110 and the consistency of the number of terminal posts 12 to be arranged on the first wall 110, on the premise that the stability of the riveted joint between the first terminal post 12 and the casing 11 is improved. For example, L3 may be 0.34×a0, 0.39×a0, 0.43×a0, 0.47×a0, or 0.5×a0.

[0183] Optionally, the width dimension L4 in the second direction Y of the second position limiting base 12c is 3 / 4 or less of the width dimension b0 in the second direction Y of the first wall 110, i.e., b0 / 2≦L4≦3*b0 / 4, which similarly improves the stability of the riveted joint between the first terminal posts 12 and the casing 11, thereby achieving both the reliability of use of the first wall 110 and the consistency of the number of terminal posts 12 to be arranged on the first wall 110. For example, L4 may be 0.52×b0, 0.6×b0, 0.65×b0, 0.72×b0, or 0.75×b0.

[0184] Alternatively, the cross-sectional area S2 of the second position limiting block 12c is 12.5% ​​or less of the circumferential area S0 of the first wall 110, i.e., 9%×S0≦S2≦25%×S0, thereby improving the reliability of the riveted joint between the first pole 12 and the casing 11 and simultaneously achieving the reliability of use of the first wall 110. For example, S2 may be 9%×S0, 9.6%×S0, 10%×S0, 11.6%×S0, 12.8%×S0, 13.2%×S0, 14.5%×S0, 15.6%×S0, 16%×S0, 17%×S0, 18.6%×S0, 19.2%×S0, 20%×S0, 25%×S0, 26%×S0, 27%×S0, 28%×S0, 29%×S0, 30%×S0, 31%×S0, 32%×S0, 33%×S0, 34%×S0, 35%×S0, 36%×S0, 37%×S0, 38%×S0, 39%×S0, 40%×S0, 41%×S0, 42%×S0, 43%×S0, 44%×S0, 45%×S0, 46%×S0, 47%×S0, 48%×S0, 49%×S0, 50%×S0, 51%×S0, 52%×S0, 53%×S0, 54%×S0, 55%×S0, 56%×S0, 57%×S0, 58%×S0, 5 × It may be S0 or the like.

[0185] 8 to 13, two mounting holes 113 are formed in the first wall 110, and one first pole 12 is installed in each mounting hole 113. The two first poles 12 have opposite polarities, and each first pole 12 satisfies the following conditions: the length dimension L3 of the second position limiting base 12c in the first direction X is 1 / 3 or more of the length dimension a0 of the first wall 110 in the first direction X; the width dimension L4 of the second position limiting base 12c in the second direction Y is 1 / 3 or more of the width dimension a0 of the first wall 110 in the second direction Y; At least one of the following conditions is satisfied: the second position limiting base 12c is more than half the dimension b0; the second position limiting base 12c is columnar and the circumferential dimension of the outer periphery of the second position limiting base 12c is more than 30% of the circumferential dimension of the first wall 110; the cross-sectional area S2 of the second position limiting base 12c is more than 9% of the area S0 of the first wall 110; and along the axial direction Z of the mounting hole 113, the thickness dimension t2 of the second position limiting base 12c is more than 0.6 of the thickness dimension t0 of the first wall 110 and is less than 1.5 of the thickness dimension t0 of the first wall 110.

[0186] 7, in some embodiments, the thickness dimension t1 of the first position limiting base 12b in the axial direction Z of the mounting hole 113 satisfies 2 mm≦t1≦3.2 mm, thereby simultaneously achieving a balance between the rivet joint strength between the first terminal post 12 and the casing 11 and the size of the space that the first terminal post 12 occupies outside the casing 11. For example, t1 may be 2 mm, 2.3 mm, 2.5 mm, 2.8 mm, 3 mm, or 3.2 mm.

[0187] 7, in the axial direction Z of the mounting hole 113, the thickness dimension t2 of the first position limiting base 12b satisfies t2≦2 mm, thereby simultaneously achieving a balance between the rivet joint strength between the first terminal post 12 and the casing 11 and the size of the space occupied by the first terminal post 12 within the casing 11. For example, t2 may be 2 mm, 1.8 mm, 1.7 mm, or 1.6 mm.

[0188] 7, the width of the portion of the first position limiting base 12b that extends beyond the outer peripheral wall of the pole body 12a in the radial direction of the mounting hole 113 is defined as x, where x≧1 mm, thereby further improving the rivet joint strength between the first pole 12 and the casing 11. For example, x may be 1 mm, 1.5 mm, 1.8 mm, or 2 mm.

[0189] In some embodiments of the present application, as shown in Figures 8 to 13, the casing 11 has a first wall 110, and two mounting holes 113 are formed in the first wall 110. Two first poles 12 are installed in each of the two mounting holes 113, i.e., one first pole 12 is installed in each mounting hole 113, and the polarities of the two first poles 12 are opposite, with one first pole 12 being a positive pole and the other first pole 12 being a negative pole.

[0190] Illustratively, all of the first poles 12 of the casing assembly 1 are provided on the first wall 110, and two first poles 12 of opposite polarity are provided on the first wall 110, and these two first poles 12 are installed at an interval along the first direction X.

[0191] In the above technical solution, the two first poles 12 of different polarities are both provided on the first wall 110, which makes it easy to assemble the casing 11 and the first poles 12. Furthermore, the two first poles 12 on the first wall 110 can be used for power supply connections to the battery cells 10, which is advantageous in simplifying the power supply connections to the battery cells 10.

[0192] Of course, the arrangement of the first poles 12 is not limited to this, and in some embodiments, as shown in Figures 14 to 18, the casing 11 has a first wall 110, four mounting holes 113 are formed on the first wall 110, and four first poles 12 are installed in each of the four mounting holes 113, that is, one first pole 12 is installed in each mounting hole 113, and two of the four first poles 12 have the same polarity, two of which are positive poles and the remaining two of which are negative poles.

[0193] Illustratively, all of the first poles 12 of the casing assembly 1 are provided on the first wall 110, and four first poles 12 are provided on the first wall 110, of which two positive poles are spaced apart along the second direction Y, two negative poles are spaced apart along the second direction Y, and a pole group consisting of two positive poles and a pole group consisting of two negative poles are spaced apart along the first direction X.

[0194] In the above technical solution, the four first poles 12 are all mounted on the first wall 110, and two of the four first poles 12 are the same. polarity This facilitates assembly of the casing 11 and the plurality of first poles 12, and also allows the four first poles 12 of the first wall 110 to be used for power supply connections to the battery cells 10, which is also advantageous in simplifying the power supply connections to the battery cells 10.

[0195] Of course, the arrangement of the first poles 12 is not limited to this. In some embodiments, the casing 11 has a first wall 110 and a second wall 11b, the second wall 11b is disposed at an angle to the first wall 110 or opposite to the first wall 110 with a gap therebetween, the first wall 110 and the second wall 11b each have a mounting hole 113, one first pole 12 is disposed in the mounting hole 113 of the first wall 110 and the mounting hole 113 of the second wall 11b, and the polarities of the two first poles 12 are opposite.

[0196] 70, the second wall 11b is disposed opposite the first wall 110 at a distance, and the second wall 11b and the first wall 110 are each provided with one first pole post 12, so that the two first pole posts 12 of the casing assembly 1 are disposed opposite each other, i.e., the first pole posts 12 of the casing assembly 1 are respectively provided on two opposing walls of the casing 1. In this case, the second wall 11b and the first wall 110 may be disposed parallel to each other or at a non-zero angle. Of course, the second wall 11b may also be adjacent to the first wall 110, and in this case, the second wall 11b and the first wall 110 form a non-zero angle, as shown in FIGS. 3 and 4.

[0197] In the above technical solution, two first poles 12 of opposite polarity are provided on the first wall 110 and the second wall 11b, respectively, and the second wall 11b and the first wall 110 are arranged at an angle or opposite to each other with a gap between them. This allows the two first poles 12 of opposite polarity to be arranged opposite to each other or at an angle, while these two first poles 12 can be used to connect the power supply to the battery cell 10. This allows the battery cell 10 to be applied to different power supply connection scenarios, which is advantageous in improving the applicability of the battery cell 10.

[0198] Of course, the arrangement of the first poles 12 is not limited to this, and further, in some embodiments, the casing 11 has a first wall 110, two mounting holes 113 formed on the first wall 110, and two first poles 12 of the same polarity are installed in each of the two mounting holes 113; the casing 11 has a second wall 11b that is angled with the first wall 110 or installed opposite and spaced apart from the first wall 110, and two mounting holes 113 formed in the second wall 11b, and one first pole 12 is installed in each of the two mounting holes 113 in the second wall 11b; the polarities of the two first poles 12 on the second wall 11b are the same, and the polarities of the two first poles 12 on the second wall 11b are opposite to those of the first poles 12 on the first wall 110.

[0199] For example, the second wall 11b is disposed opposite the first wall 110 at a distance, and two first electrode posts 12 are provided on each of the second wall 11b and the first wall 110, and the first electrode posts 12 on the first wall 110 are positive electrode posts, and the first electrode posts 12 on the second wall 11b are negative electrode posts, so that the positive and negative electrode posts of the casing assembly 1 are disposed opposite each other, and the first electrode posts 12 of the casing assembly 1 are disposed on two opposing walls of the casing 1, respectively. In this case, the second wall 11b and the first wall 110 may be parallel or may form a non-zero angle. Of course, the second wall 11b may also be adjacent to the first wall 110, so that the second wall 11b and the first wall 110 form a non-zero angle.

[0200] In the above technical solution, two first poles 12 with the same polarity are installed on the first wall 110, and two first poles 12 with the same polarity are installed on the second wall 11b. The polarity of the first poles 12 installed on the first wall 110 is opposite to that of the first poles 12 installed on the second wall 11b. Similarly, the two first poles 12 with opposite polarity can be installed opposite to each other or at an angle, and these four first poles 12 can be used to connect the power supply to the battery cell 10. This allows the battery cell 10 to be applied to different power supply connection scenarios, which is advantageous in improving the applicability of the battery cell 10.

[0201] 3 and 4, in some embodiments, there are a plurality of first poles 12, and all of the first poles 12 are provided on the same wall of the casing 11. Therefore, the casing 11 includes a plurality of walls, with all of the first poles 12 provided on one wall and no first poles 12 on the remaining walls. When the casing assembly 1 is used in a battery cell 10, the electrical connections between the battery core assembly 2 of the battery cell 10 and the corresponding first poles 12 can all be made on the same side of the casing 11, thereby improving the convenience of assembling the battery cell 10.

[0202] For example, the casing 11 has a first wall 110, and the mounting holes 113 are formed on the first wall 110. In this case, all of the first pole posts 12 are provided on the first wall 110, and the first wall 110 may be the wall with the largest area of ​​the casing 11, or the area of ​​the first wall 110 may be smaller than the wall with the largest area of ​​the casing 11.

[0203] In some embodiments, as shown in FIG. 3, the casing 11 includes a casing body 111 and a casing cover 112, one end of the casing body 111 is open, the casing cover 112 is fitted to the open end of the casing 11, and the first poles 12 are both provided at one end of the casing body 111 away from the casing cover 112.

[0204] As will be understood, when the battery cells 10 are used to form a battery pack, the first poles 12 of the two battery cells 10 are electrically connected to each other. Because the first poles 12 are provided on the casing body 111, when the two battery cells 10 are pulled (for example, when the battery cells 10 are deformed and the two battery cells 10 move relative to each other), the tensile force between the two battery cells 10 acts on the casing body 111, not on the casing cover 112. In this situation, the tensile force is less likely to be applied between the casing cover 112 and the casing body 111, which effectively reduces the probability of cracks occurring between the casing cover 112 and the casing body 111 and improves the reliability of the battery cells 10 in use.

[0205] For example, the bottom of the casing body 111 is open, and the casing cover 112 is installed on the bottom of the casing body 111. When the plurality of battery cells 10 are assembled into a battery pack, the bottom of the casing 11 is fixed to a support, i.e., at least the casing cover 11 2 is When the battery pack is vibrated during use, the amplitude of vibrations experienced by the casing cover 112 is relatively small, which further reduces the probability of cracks occurring between the casing cover 112 and the casing body 111 and improves the reliability of the battery cells 10 during use.

[0206] Alternatively, the casing cover 112 may have a flat structure or a housing structure with one end facing the casing body 111 being open.

[0207] In some embodiments, there are multiple first poles 12, and all of the first poles 12 are respectively provided on different walls of the casing 11, so that the casing 11 includes multiple walls, and at least two of the multiple walls are respectively provided with first poles 12, which makes it possible to flexibly arrange the battery cells 10 and other electrical connecting components. At the same time, it is possible to realize distributed installation of all the first poles 12, and the first poles 12 can fully utilize the arrangement area provided by the corresponding walls, which is advantageous in increasing the cross-sectional area of ​​the first poles 12, thereby improving the current-passing capacity of the first poles 12 to a certain extent.

[0208] For example, all of the first poles 12 are respectively installed on two opposing walls of the casing 11 (as shown in Figures 7 to 9), or all of the first poles 12 are respectively installed on two adjacent walls of the casing 11. Of course, all of the first poles 12 can also be distributed on three or more walls of the casing 11.

[0209] In some embodiments, as shown in Figures 67 and 70, all the first poles 12 are respectively installed on two opposite walls of the casing 11, which further facilitates the distributed arrangement of all the first poles 12, allows the first poles 12 to fully utilize the arrangement area provided by the corresponding walls, and advantageously increases the cross-sectional area of ​​the first poles 12, thereby further improving the current-passing capacity of the first poles 12 to a certain extent.

[0210] For example, the casing 11 has a first wall 110 and a second wall 11b arranged opposite each other, and the first wall 110 and the second wall 11b each have a mounting hole 113, whereby the first wall 110 and the second wall 11b each have a first pole 12, and the first poles 12 on the first wall 110 are first polarity poles, and the first poles 12 on the second wall 11b are second polarity poles. This allows for an appropriate spacing between the first polarity poles and the second polarity poles, which is advantageous in improving the insulation performance between the first polarity poles and the second polarity poles. The first wall 110 and the second wall 11b may be the wall with the largest area of ​​the casing 11, or the areas of the first wall 110 and the second wall 11b may both be smaller than the wall with the largest area of ​​the casing 11.

[0211] In some embodiments, as shown in FIG. 7 , the casing assembly 1 further includes an insulating seal member 8, which is disposed between the first pole 12 and the casing 11 to enhance the insulation and sealing properties between the first pole 12 and the casing 11, improve the rivet joint sealing properties between the first pole 12 and the casing 11, and improve the usage reliability of the battery cell 10 when the casing assembly 1 is used with the battery cell 10.

[0212] In some embodiments, FIG. 7 17, the insulating seal member 8 includes an insulating member 81 and a first seal member 82, the insulating member 81 being provided between the first position limiting base 12b and the casing 11, and the first seal member 82 being provided between the second position limiting base 12c and the casing 11. A portion of the insulating member 81 and / or a portion of the first seal member 82 is fitted between the pole body 12a and the peripheral wall of the mounting hole 113 to separate the pole body 12a from the peripheral wall of the mounting hole 113, facilitating the insulating installation between the first pole 12 and the casing 11, and at the same time improving the sealing performance between the pole body 12a and the mounting hole 113.

[0213] Therefore, since the first pole 12 is riveted to the casing 11, a tight fit can be achieved between the insulating member 81, the first position limiting base 12b, and the casing 11, and a tight fit can be achieved between the first sealing member 82, the first position limiting base 12b, and the casing 11, which is advantageous in improving the installation reliability of the first pole 12.

[0214] 7, a first groove 11c formed in the outer wall of the casing 11 accommodates the insulating member 81, facilitating positioning and installation of the insulating member 81 and preventing misalignment of the insulating member 81 during the riveting process between the first terminal post 12 and the casing 11. At the same time, providing the first groove 11c reduces the height at which the insulating member 81 protrudes from the outer wall of the casing 11, thereby reducing the height at which the first terminal post 12 protrudes from the outer wall of the casing 11, which is beneficial to improving the volumetric energy density (VED) of the battery cell 10. Of course, the first groove 11c need not be formed in the outer wall of the casing 11 (as shown in FIGS. 9, 16, and 17).

[0215] Alternatively, the insulating member 81 and the first sealing member 82 may be made of a plastic member, a silicone member, or the like.

[0216] 7, an assembly protrusion 11d is formed on the inner wall of the casing 11, and the fitting protrusion 11d abuts against and fits into the first seal member 82, thereby improving the sealing reliability of the first seal member 82. Of course, the fitting protrusion 11d does not have to be formed on the inner wall of the casing 11 (as shown in FIGS. 19, 24, and 25).

[0217] For example, in the examples of Figures 7, 19, and 21, a first fitting groove 11c is formed on the outer wall of the casing 11 to accommodate the insulating member 81, and a fitting protrusion 11d is formed on the inner wall of the casing 11, and the fitting protrusion 11d abuts against and fits into the first sealing member 82.

[0218] In some other embodiments, as shown in FIG. 19 , a second mating groove 11e may be further formed on the inner wall of the casing 11, and the second mating groove 11e may be used to accommodate a first sealing member 82. This reduces the height of the first sealing member 82 protruding from the inner wall of the casing 11, providing reliable use of the casing 11. This ensures a certain amount of space for other components inside the casing 11, such as the active material application portion 21, and improves the volumetric energy density of the battery cell 10.

[0219] Alternatively, the insulating seal member 8 may be an integral member, for example, the insulating member 81 and the first seal member 82 are an integral member, in which case the insulating member 81 and the first seal member 82 may be made of the same or different materials. Of course, the insulating member 81 and the first seal member 82 may also be separate members.

[0220] 21 is a schematic diagram of the assembly process of the first terminal post 12 and the first wall 110 provided by some embodiments of the present application. In the embodiment of the present application, the first position limiting block 12b, the second position limiting block 12c, and the terminal post body 12a are an integral member. Before the first terminal post 12 is riveted to the casing 11, one of the first position limiting block 12b and the second position limiting block 12c can extend along the axial direction of the mounting hole 113, and the other can extend along the radial direction of the mounting hole 113. After the terminal post body 12a is drilled into the mounting hole 113, a tool or the like is used to pier-rivet one of the first position limiting block 12b and the second position limiting block 12c so that it extends along the radial direction of the mounting hole 113, thereby realizing the riveting of the first terminal post 12 and the casing 11.

[0221] In the following description of the present application, a rectangular casing 11 is taken as an example, but those skilled in the art will easily understand the embodiments in which the casing 11 has other shapes after reading the following technical solutions.

[0222] In some embodiments of the present application, as shown in FIGS. 5 and 6, a receiving portion 121 is provided on the first pole 12, and at least a part of the conductive portion 22 is received in the receiving portion 121.

[0223] At least one of the poles of the battery cell 10 is a first pole 12 having a receiving portion 121. The first pole 12 can be used as either a positive pole or a negative pole. The receiving portion 121 is a virtual structure having a receiving space, and may be a slot-like structure, a hole-like structure, or a combination of a slot-like structure and a hole-like structure. In other words, all of the poles in the casing 11 may be first poles 12 having a receiving portion 121, or some of the poles in the casing 11 may be first poles 12 having a receiving portion 121. When some of the poles in the casing 11 are first poles 12 having a receiving portion 121, the remaining poles in the casing 11 are second poles 15 having no receiving portion 121 (see FIGS. 27 and 28).

[0224] Both the first pole 12 and the second pole 15 can be electrically connected to the active material-coated portion 21 via the conductive portion 22, thereby enabling charging and discharging of the battery cell 10. Of course, in other embodiments of the present application, only one pole may be installed on the casing assembly 1, and this pole may be the first pole 12, which may include two portions that are insulated and connected and used as a positive pole and a negative pole, respectively. For simplicity of explanation, the following description will mainly focus on an embodiment in which all poles in the casing 11 are first poles 12 each having a receiving portion 121 formed therein.

[0225] 5 and 6, in the embodiment of the present application, at least a portion of the conductive portion 22 is accommodated in the corresponding accommodating portion 121. Here, "at least a portion" means that the conductive portion 22 is completely accommodated in the accommodating portion 121, or that only a portion of the conductive portion 22 is accommodated in the accommodating portion 121. Because the accommodating portion 121 is provided in the first pole 12, the hollow structure of the accommodating portion 121 reduces the weight of the pole 12 to some extent, thereby improving the weight-energy density of the battery cell 10 and the battery 100.

[0226] Furthermore, by accommodating a part or all of the conductive portion 22 in the accommodating portion 121, the portion of the conductive portion 22 accommodated in the accommodating portion 121 occupies space within the first electrode post 12, thereby reducing the space occupied by the conductive portion 22 within the casing 11. If the dimensions of the casing 11 are fixed, a larger active material-coated portion 21 can be accommodated within the casing 11 to save space and improve the volumetric energy density of the battery cell 10. For example, if the conductive portion 22 is pulled out from the side of the active material-coated portion 21 closest to the first electrode post 12, the space occupied by the conductive portion 22 between the active material-coated portion 21 and the first electrode post 12 can be saved. This increases the dimension of the active material-coated portion 21 in the direction in which the conductive portion 22 is pulled out, reducing the distance between the active material-coated portion 21 and the first electrode post 12, improving the energy density of the battery cell 10.

[0227] Furthermore, by accommodating at least a portion of the conductive portion 22 within the accommodating portion 121, the space occupied by the battery cell 10 itself is reduced, allowing more battery cells 10 to be accommodated in a battery 100 of the same volume, thereby improving the volumetric energy density of the battery 100. Furthermore, by accommodating at least a portion of the conductive portion 22 within the accommodating portion 121, the conductive portion 22 occupies space within the first electrode post 12, thereby reducing at least some of the redundancy of the conductive portion 22 within the casing 11, reducing the probability of a short circuit between the conductive portion 22 and the active material-coated portion 21, and reducing the risk of a short circuit in the battery cell 10, thereby improving the operational reliability and stability of the battery cell 10 and the battery 100. Furthermore, accommodating at least a portion of the conductive portion 22 within the accommodating portion 121 is advantageous for stabilizing and positioning the conductive portion 22, improving the stability of the conductive portion 22, facilitating welding of the conductive portion 22 to the first electrode post 12, and improving assembly efficiency.

[0228] In some optional embodiments of the present application, referring again to Figures 3, 5, and 6, each of the multiple poles in the casing assembly 1 is a first pole 12 having an accommodating portion 121, in which case more conductive portions 22 can be accommodated in all of the first poles 12, thereby further improving the volumetric energy density of the battery cell 10.

[0229] In some other optional embodiments of the present application, referring to Figures 27 and 28, at least one of the multiple poles in the casing assembly 1 is a first pole 12 having an accommodating portion 121, and at least one is a second pole 15 not having an accommodating portion 121, so that the first pole 12 and the second pole 15 can be flexibly selected and combined according to actual needs such as energy density and cost, thereby improving the applicability of the battery cell 10.

[0230] 27 and 28, when the second electrode post 15 is installed in the casing 11, a clearance groove 18 is defined between the second electrode post 15 and the casing 11, and at least a portion of the conductive part 22 is accommodated in the clearance groove 18. This reduces the space occupied by the conductive part 22 in the casing 11 to some extent, which is advantageous for improving the energy density and alleviating the short-circuit problem caused by the redundancy of the conductive part 22.

[0231] In some embodiments of the present application, the receiving portion 121 may be located on the side of the first electrode post 12 facing the active material-coated portion 21, or on the side of the first electrode post 12 away from the active material-coated portion 21. For example, FIG. 29 is a schematic local cross-sectional view of a battery cell 10 provided according to some embodiments of the present application, and FIG. 30 is a schematic local cross-sectional view of a battery cell 10 provided according to some embodiments of the present application. Referring to FIGS. 29 and 30 , when the receiving portion 121 is located on the side facing the active material-coated portion 21 of the first electrode post 12, the receiving portion 121 includes a first receiving groove 12110, the surface of the first electrode post 12 facing the active material-coated portion 21 is the electrode post inner end surface 122, the groove opening of the first receiving groove 12110 is formed on the electrode post inner end surface 122, and at least a portion of the conductive portion 22 is received in the first receiving groove 12110.

[0232] For example, the first accommodating groove 12110 is a groove body, and the groove body has a groove-like structure with a certain depth. For example, when the first electrode post 12 is installed on the upper end wall of the casing 11 and the electrode post inner end surface 122 is the lower surface of the first electrode post 12, the first accommodating groove 12110 is formed as an accommodating groove with a groove opening downward and groove walls recessed upward. Also, when the first electrode post 12 is installed on the lower end wall of the casing 11 and the electrode post inner end surface 122 is the upper surface of the first electrode post 12, the first accommodating groove 12110 is formed as an accommodating groove with a groove opening upward and groove walls recessed downward.

[0233] In the above technical solution, by forming the first accommodating groove 12110 in the first pole 12, the weight of the first pole 12 can be reduced to a certain extent, improving the weight-to-energy density of the battery cell 10 and the battery 100. Meanwhile, because the groove opening of the first accommodating groove 12110 is formed on the inner end surface 122 of the pole, which is the surface of the first pole 12 that is closest to the active material-coated portion 21, the first accommodating groove 12110 can be opened toward the active material-coated portion 21, and the conductive portion 22 can extend into the first accommodating groove 12110, improving assembly efficiency. Furthermore, such a first accommodating groove 12110 is easy to process, improving production efficiency.

[0234] In addition, the first accommodating groove 12110 is easy to process and has a relatively large volume, so it can accommodate a larger number of conductive parts 22. At the same time, because the first accommodating groove 12110 is open toward the active material application portion 21, the first accommodating groove 12110 also functions as a buffer and temporary storage structure for the electrolyte, so that a larger amount of electrolyte can be accommodated within the casing 11. Since the electrolyte is consumed during the charging and discharging process of the battery cell 10, the service life of the battery cell 10 can be extended when there is a larger amount of electrolyte. Furthermore, because the first accommodating groove 12110 is open toward the active material application portion 21, the first accommodating groove 12110 can also be used as a buffer and buffer structure for gas generated inside the battery core assembly 2, so as to reduce the expansion of the battery cell 10 and improve the reliability and stability of the battery cell 10.

[0235] Furthermore, because the first accommodating groove 12110 is located inside the first pole 12, external foreign objects and impurities are less likely to enter the first accommodating groove 12110, reducing the impact of external foreign objects and impurities on the battery core assembly 2 and improving the stability and reliability of the operation of the battery core assembly 2, thereby improving the stability and reliability of the battery cell 10 and the battery 100. Furthermore, the first accommodating groove 12110 may be located corresponding to the position of the mounting hole 113, in other words, it may be located corresponding to a projection plane perpendicular to the axial direction R of the first pole 12. Because the orthogonal projection of the first accommodating groove 12110 is located within the orthogonal projection range of the mounting hole 113, the first accommodating groove 12110 has a greater depth and can accommodate a larger number of conductive parts 22, thereby significantly reducing the space occupied by the conductive parts 22 within the casing 11.

[0236] Specifically, a mounting hole 113 is opened in the casing 11, the first pole 12 is mounted in the mounting hole 113, and the depth H1 of the first accommodating groove 12110 along the axial direction R of the first pole 12 is greater than or equal to the minimum distance H2 from the pole inner end face 122 to the mounting hole 113.

[0237] It should be noted that the specific shape of the first housing groove 12110 is not particularly limited, and may be a regular or irregular shape, such as a cylindrical groove having a cross section such as a rectangular, elliptical, or racetrack-shaped (a structure formed by two arc lines and two straight lines surrounding each other), a trapezoidal groove having a rectangular cross section with gradually varying cross-sectional dimensions, a hemispherical groove having a circular cross section with gradually varying cross-sectional dimensions, or a semi-elliptical groove having an elliptical cross section with gradually varying cross-sectional dimensions. Therefore, the depth H1 of the first housing groove 12110 refers to the maximum depth of the first housing groove 12110 along the axial direction R of the first pole post 12.

[0238] In the axial direction R of the first pole 12, the depth H1 of the first accommodating groove 12110 is equal to or greater than the minimum distance H2 from the pole inner end surface 122 to the mounting hole 113, making full use of the volume of the first pole 12. The first accommodating groove 12110 has a relatively large depth, which is advantageous for accommodating more conductive parts 22 and further reducing the space occupied by the conductive parts 22 within the casing 11, further improving the energy density of the battery cell 10 and further reducing the redundancy of the conductive parts 22 within the casing 11. At the same time, the relatively large depth of the first accommodating groove 12110 not only allows it to accommodate gas generated in the battery core assembly 2 and ensure the reliability and stability of the battery cell 10, but also allows it to accommodate more electrolyte and ensure the service life of the battery cell 10.

[0239] It should be further noted that the volume of the first receiving groove 12110 is not limited. For example, in some embodiments, the volume of the first receiving groove 12110 for receiving the conductive portion 22 (referred to as first volume V1) is 298 mm 3 This allows the first receiving groove 12110 to have a relatively sufficient space to receive the conductive portion 22, facilitating welding of the conductive portion 22 to the first pole 12. On the other hand, if the first volume V1 of the first receiving groove 12110 is 298 mm 3 If it is less than this, the ability of the first accommodating groove 12110 to accommodate the conductive portion 22 becomes relatively low, making it difficult to weld the conductive portion 22 and the first pole 12 together.

[0240] Furthermore, it should be explained that the first volume V1 of the first accommodating groove 12110 is the difference between the total volume V2 of the first accommodating groove 12110 and the volume (denoted as second volume V3) required for the first accommodating groove 12110 to accommodate components other than the conductive portion 22, i.e., V1 = V2 - V3. As can be understood, if the first accommodating groove 12110 does not need to accommodate components other than the conductive portion 22, the second volume V3 is 0 mm 3 For example, the first volume V1 of the first receiving groove 12110 can be 300 mm 3 ~1500mm 3 For example, 300 mm3 , 400mm 3 , 500mm 3 , 600mm 3 , 700mm 3 , 800mm 3 , 1000mm 3 , 1200mm 3 , 1400mm 3 , 1500mm 3 etc.

[0241] 29 and 30 , to ensure the stability and reliability of the electrical connection between the active material coating portion 21 and the first electrode post 12, in this embodiment, the electrical connection position between the conductive portion 22 and the first electrode post 12 may be located on the groove wall of the first receiving groove 12110. For example, the conductive portion 22 and the first electrode post 12 may be electrically connected by welding, and the electrical connection position is the welding position between the conductive portion 22 and the first electrode post 12. The welding method between the conductive portion 22 and the first electrode post 12 is not limited and may be, for example, laser welding. Depending on factors such as the position, angle, or structure of the welding portion, vertical welding, angle welding, lap welding, edge welding, etc. may be selected. In other embodiments, the electrical connection between the conductive portion 22 and the first electrode post 12 may be achieved by other methods instead of welding, such as using a conductive adhesive or a conductive pin. For the sake of simplicity, the following description will be given taking as an example the conductive portion 22 and the first pole 12 being electrically connected by welding, and the welding position being the electrical connection position between the conductive portion 22 and the first pole 12.

[0242] Specifically, the first electrode post 12 specifically includes a first end wall 12111 and a first side wall 12113, the first end wall 12111 being 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 surrounding each other forming a first accommodating groove 12110, and the electrical connection position between the conductive portion 22 and the first electrode post 12 being located on the first end wall 12111 and / or the first side wall 12113. In other words, the conductive portion 22 may be welded to at least one of the first end wall 12111 and the first side wall 12113.

[0243] In the above technical solution, the electrical connection position between the conductive portion 22 and the first pole 12 is located on at least one of the first end wall 12111 and the first side wall 12113. This allows the first receiving groove 12110 to receive at least a portion of the conductive portion 22, and the groove wall of the first receiving groove 12110 to establish electrical connection with the conductive portion 22. This simplifies the structure of the first pole 12, facilitates processing of the first pole 12, simplifies the structure of the conductive portion 22, reduces redundancy of the conductive portion 22, and reduces the cost of the structure of the conductive portion 22. Furthermore, using the groove wall of the first receiving groove 12110 to establish electrical connection with the conductive portion 22 allows for a relatively large electrical connection area between the conductive portion 22 and the first pole 12. This not only simplifies the electrical connection but also improves the reliability and stability of the electrical connection, thereby improving the performance of the battery cell 10.

[0244] Furthermore, by positioning the electrical connection position between the conductive portion 22 and the first pole 12 within the first accommodating groove 12110, not only can the electrical connection position be prevented from protruding outside the first pole 12 and occupying space other than the first pole 12, but the first pole 12 can be protected at the electrical connection position, thereby improving the reliability and stability of the electrical connection between the conductive portion 22 and the first pole 12.

[0245] Furthermore, in the embodiment of the present application, the first end wall 12111 has a sealed structure without any through holes so that the first accommodating groove 12110 is isolated from the external space of the casing 11, thereby avoiding the problem of the electrolyte in the casing 11 leaking from the first accommodating groove 12110.

[0246] 29 and 30, in the embodiment of the present application, the local shape of the conductive portion 22 matches the local shape of the first end wall 12111 and is closely arranged to achieve electrical connection, so that the electrical connection position between the conductive portion 22 and the first end wall 12111 extends along the length or width direction of the first end wall 12111. For example, if the first end wall 12111 is flat, the local portion of the conductive portion 22 may also be flat and be closely arranged to the first end wall 12111, and the closely arranged portion may be electrically connected by, for example, welding. This increases the electrical connection area and improves the reliability and stability of the electrical connection.

[0247] Furthermore, when the electrical connection between the conductive portion 22 and the first end wall 12111 is made by welding, the first end wall 12111 is located on the side of the first accommodating groove 12110 away from the active material application portion 21, making it easy to perform the welding operation, for example, by allowing welding to be performed from the side of the first pole 12 away from the active material application portion 21.

[0248] It should be noted that the shape of the first end wall 12111 is not limited, and may be, for example, a flat plate or an arcuate plate. Here, when the first end wall 12111 has a flat structure, the first end wall 12111 is disposed at an angle with the axial direction R of the first pole post 12, and may be, for example, a flat plate structure perpendicular to the axial direction R of the first pole post 12, or may be, for example, an inclined plate structure not perpendicular to the axial direction R of the first pole post 12, but the inclination direction is not limited.

[0249] Of course, in other embodiments of the present application, the electrical connection position between the conductive portion 22 and the first end wall 12111 does not necessarily extend along the length or width of the first end wall 12111, but may be, for example, a plurality of discretely located points, for example, the conductive portion 22 has a plurality of spaced apart portions that are each welded to the first end wall 12111, and the description of these will be omitted here.

[0250] 31 is a schematic cross-sectional view of a battery cell 10 provided by some embodiments of the present application. Referring to FIG. 31, in this embodiment, when the conductive portion 22 is electrically connected to the first end wall 12111, a first sunken groove 12112 can be provided in the groove wall of the first receiving groove 12110, and the sunken direction of the first sunken groove 12112 is a direction away from the active material coated portion 21. The position where the guide portion 22 and the first pole 12 are electrically connected is at least partially located within the first sunken groove 12112.

[0251] Illustratively, the first accommodating groove 12110 has a first end wall 12111 and a first side wall 12113, a first sunken groove 12112 is provided in the first end wall 12111, and at least a portion of the electrical connection position between the conductive portion 22 and the first end wall 12111 is located within the first sunken groove 12112. In this case, at least a portion of the conductive portion 22 is disposed within the first sunken groove 12112 and is connected to a portion of the first end wall 12111 of the first accommodating groove 12110 that defines the first sunken groove 12112.

[0252] In the above technical solution, on the one hand, the first sunken groove 12112 can realize pre-positioning and position restriction of the electrical connection position of the conductive part 22, which is advantageous not only for achieving accurate positioning and electrical connection and improving production efficiency, but also for improving the stability and reliability of the conductive part 22 and ensuring the stability and reliability of the charge and discharge processes of the battery cell 10. On the other hand, by providing the first sunken groove 12112 in the first end wall 12111, the wall thickness of a local part of the first end wall 12111 can be locally thinned, which is not only advantageous for welding, but also for reducing the weight of the first pole 12 and improving the weight-energy density of the battery cell 10.

[0253] In some alternative embodiments, a portion of the conductive portion 22 is fitted to the shape of the first side wall 12113 and closely attached to it, for example, if the first side wall 12113 is curved, a portion of the conductive portion 22 may also be curved and closely attached to the first side wall 12113, and an electrical connection (e.g., welding) may be made at the closely attached position so that the electrical connection position between the conductive portion 22 and the first side wall 12113 extends along the first side wall 12113. This increases the electrical connection area and improves the reliability and stability of the electrical connection.

[0254] Of course, in other embodiments of the present application, the electrical connection position between the conductive portion 22 and the first side wall 12113 does not necessarily extend along the first side wall 12113, but may be, for example, a plurality of discretely located points, for example, the conductive portion 22 has a plurality of spaced apart portions that are each welded to the first side wall 12113, and the description of these will be omitted here.

[0255] It should be noted that the number of first side walls 12113 is not limited and may be determined according to the shape of the first receiving groove 12110, as long as one end of each first side wall 12113 remote from the groove opening of the first receiving groove 12110 is connected to the first end wall 12111. For example, if the cross-sectional shape of the first receiving groove 12110 is circular or elliptical, the first end wall 12111 is also circular or elliptical, and there is one first side wall 12113 formed in an annular shape and installed around the periphery of the first end wall 12111. For further example, if the cross-sectional shape of the first receiving groove 12110 is rectangular or racetrack-shaped, the first end wall 12111 is also rectangular or racetrack-shaped, and there are four first side walls 12113 connected to the four sides of the first end wall 12111, respectively.

[0256] It should be further explained that the first accommodating 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 be present. In this case, the first accommodating groove 12110 can be defined only by the plurality of first side walls 12113 by gathering one end of each first side wall 12113 away from the groove mouth of the first accommodating groove 12110. In this case, the conductive portion 22 is electrically connected to the first side wall 12113, and it is only necessary to ensure that the charging and discharging process of the battery cell 10 is carried out normally.

[0257] It should also be noted that in other embodiments of the present application, the electrical connection position between the conductive portion 22 and the first pole 12 does not have to be located within the first accommodating groove 12110. For example, the electrical connection position between the conductive portion 22 and the first pole 12 can be located on the pole inner end surface 122, in which case a portion of the conductive portion 22 is accommodated in the first accommodating groove 12110, saving some space and improving the energy density of the battery cell 10.

[0258] In the embodiment of the present application, referring again to Figures 30 and 31, the first electrode post 12 can further have a first groove 126 installed therein if necessary, and the first groove 126 is located on the side of the first electrode post 12 that is away from the active material application portion 21. That is, the surface of the first electrode post 12 that is away from the active material application portion 21 is the electrode post outer end surface 123, and the groove opening of the first groove 126 is formed on the electrode post outer end surface 123.

[0259] As can be understood, the first groove 126 is a groove body, and the groove body has a groove-like structure with a certain depth. When the first electrode post 12 is installed on the upper end wall of the casing 11 and the electrode post outer end surface 123 is the upper surface of the first electrode post 12, the first groove 126 is formed as a groove with an opening facing upward and groove walls recessed downward (i.e., recessed in the direction approaching the battery core assembly 2). Also, when the first electrode post 12 is installed on the lower end wall of the casing 11 and the electrode post outer end surface 123 is the lower surface of the first electrode post 12, the first groove 126 is formed as a groove with an opening facing downward and groove walls recessed upward (i.e., recessed in the direction approaching the battery core assembly 2).

[0260] In the above technical solution, the first recess 126 is installed in the first pole 12, which further reduces the weight of the first pole 12 and improves the weight-energy density of the battery cells 10 and the battery 100. Meanwhile, the first recess 126 is located on the outside of the first pole 12, i.e., it is open toward the side of the first pole 12 that is away from the inside of the casing 11. Therefore, the first recess 126 can accommodate or mount structural components that are electrically connected to each battery cell 10 in the battery 100, which makes full use of the space within the first pole 12 and improves the space utilization rate and volumetric energy density of the battery 100.

[0261] Furthermore, because the first electrode post 12 has both the first accommodating groove 12110 and the first groove 126, and the first groove 126 is located on the side of the first accommodating groove 12110 that is away from the active material coated portion 21 and is open in the direction away from the first accommodating groove 12110, it is easy to laser-weld the conductive portion 22 and the first end wall 12111 through the first groove 126 from the outside of the first electrode post 12, i.e., the side of the first electrode post 12 that is away from the active material coated portion 21, and it is also easy to achieve an electrical connection between the conductive portion 22 and the first electrode post 12 by external welding. In other words, the above structure and installation makes it easy to externally weld the first electrode post 12 and the conductive portion 22 through the first groove 126, facilitating the processing and manufacturing of the battery cell 10 and reducing processing and manufacturing costs.

[0262] Furthermore, in order to simply and effectively weld the conductive portion 22 to the groove wall of the first accommodating groove 12110 through the first groove 126 and improve the reliability of the welding between the conductive portion 22 and the groove wall of the first accommodating groove 12110, in the embodiment of the present application, the portion between the first groove 126 and the first accommodating groove 12110 can be laser welded to the conductive portion 22, that is, the spacing portion 127 shown in Figure 31 is laser welded to the conductive portion 22 to realize the electrical connection between the battery core assembly 2 and the first pole 12. The gap 127 between the first groove 126 and the first accommodating groove 12110 of the first pole 12 has a small thickness, and the gap 127 separates the first groove 126 from the first accommodating groove 12110. The wall surface of the gap 127 on the side closest to the active material application portion 21 can be the first end wall 12111. When the conductive portion 22 needs to be welded to the first end wall 12111, the relatively small thickness of the gap 127 is advantageous for welding the conductive portion 22 to the first end wall 12111 via the first groove 126, improving the convenience and reliability of the welding.

[0263] In some embodiments, the first accommodating groove 12110 may be configured with a cross-sectional shape in which the length is greater than the width, such as a rectangle, oval, or racetrack shape, and the weld mark formed by welding the conductive portion 22 to the first electrode post 12 may be an elongated weld mark parallel to the length direction of the first accommodating groove 12110 to improve the reliability of the weld and increase the current passing capacity. For example, when an elongated weld mark is formed by welding the conductive portion 22 to the first end wall 12111, the width of the weld mark may be 6 mm or more, and the distance between the weld mark and the first side wall 12113 may be 1 mm or more to ensure the convenience and reliability of the weld and maintain the current passing capacity of the battery cell 10.

[0264] Referring again to FIG. 30, the battery cell 10 further includes a groove cover 7, which is attached to the first pole 12 and seals the opening of the first recessed groove 126.

[0265] In the above technical solution, by installing a groove cover 7 to seal the first groove 126, the first pole 12 can achieve an indirect electrical connection with the bus member via the groove cover 7. The position and structure of the groove cover 7 make the electrical connection between the groove cover 7 and the bus member more convenient and increase the electrical connection area. Therefore, installing the groove cover 7 facilitates the electrical connection between adjacent battery cells 10 in the battery 100. Furthermore, because the electrical connection positions between the battery cells 10 are located on the groove cover 7, the electrical connection positions between the conductive part 22 and the first pole 12 can be separated by the first groove 126, reducing interference between them and further improving the stability and reliability of the battery cells 10.

[0266] It should be noted that based on the technical proposal that the accommodating portion 121 includes the first accommodating groove 12110, the specific configuration of the battery core assembly 2 in the examples of the present application is not limited, and can include, for example, but is not limited to, the following two embodiments:

[0267] FIG. 32 is a schematic cross-sectional view of a battery core assembly 2 provided in some examples of the present application. Referring to FIGS. 30 to 32, in the first embodiment, the active material application portion 21 includes a current collector 211 and an active material layer 212 provided 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 sheets 2211, and the tab sheets 2211 are electrically connected to the current collector 211, This is a structure in which no active material is applied, and can be formed by directly stamping the current collector 211, and the multiple tab sheets 2211 gather at a position close to the current collector 211 (i.e., converge in a direction toward each other) to form a first converging portion 2212, and the multiple tab sheets 2211 gather at a position away from the current collector 211 and connect to form a second converging portion 2213, and the first converging portion 2212 connects the second converging portion 2213 to the active material-applied portion 21. When the accommodating portion 121 has a first accommodating groove 12110, at least a portion of the second converging portion 2213 can be accommodated in the first accommodating groove 12110.

[0268] In the above technical solution, the multiple tab sheets 2211 simply converge (i.e., converge toward each other) but are not connected when forming the first converging portion 2212, but when forming the second converging portion 2213, the multiple tab sheets 2211 not only converge but also connect to form an integral structure. For example, the multiple tab sheets 2211 can be connected to an integral plate-like structure by welding (e.g., ultrasonic welding) to form the second converging portion 2213, or the multiple tab sheets 2211 can be gathered and connected by a method such as bonding with a conductive adhesive to form the second converging portion 2213, and the description thereof will be omitted here.

[0269] For illustrative purposes, in the present embodiment, the tab sheet 2211 is divided into a positive electrode tab sheet 2211 and a negative electrode tab sheet 2211. The positive electrode tab sheets 2211 that need to converge are stacked and ultrasonically tack-welded to form a positive electrode second convergence portion 2213, thereby reducing the interlayer gap and forming a plate-like structure with a certain rigidity from the plurality of puffed positive electrode tab sheets 2211. Similarly, the negative electrode tab sheets 2211 that need to converge are stacked and ultrasonically tack-welded to form a negative electrode second convergence portion 2213, thereby reducing the interlayer gap and forming a plate-like structure with a certain rigidity from the plurality of puffed negative electrode tab sheets 2211.

[0270] In the above technical solution, "a plurality of tab sheets 2211 gather at a position close to the current collector 211 to form a first converging portion 2212, and a plurality of tab sheets 2211 gather at a position away from the current collector 211 to connect to form a second converging portion 2213" means that the first converging portion 2212 and the second converging portion 2213 are sequentially arranged along the extending direction of the tab sheets 2211 in a direction away from the current collector 211, and the specific positions of the first converging portion 2212 and the second converging portion 2213 are not limited, that is, it is not required how close the first converging portion 2212 is to the current collector 211 or how far the second converging portion 2213 is from the current collector 211. In some alternative embodiments, the current collector 211 and tab sheet 2211 may be a unitary member, such as an aluminum foil integrally molded with the positive electrode piece, or a copper foil integrally molded with the negative electrode piece.

[0271] In the above technical solution, the tab portion 221 includes a second converging portion 2213 formed by gathering and connecting multiple tab sheets 2211, so that at least a portion of the second converging portion 2213 is accommodated in the first accommodating groove 12110, which facilitates the connection between the conductive portion 22 and the first pole 12, makes full use of the space in the first pole 12, and improves the volumetric energy density of the battery cell 10.

[0272] 30 to 32 , in the first embodiment, at least a portion of the first converging portion 2212 is accommodated in the first accommodating groove 12110. In the above technical solution, at least a portion of the first converging portion 2212 and at least a portion of the second converging portion 2213 of the tab portion 221 are both accommodated in the first accommodating groove 12110, which makes better use of the space within the first pole 12, further reduces the space occupied by the tab portion 221 within the casing 11, allows a larger active material applied portion 21 to be accommodated, improves the volumetric energy density of the battery cell 10, and better reduces the redundancy of the tab portion 221 within the casing 11, thereby further reducing the probability of a short circuit between the tab portion 221 and the active material applied portion 21.

[0273] In this embodiment, the second converging portion 2213 and the first electrode post 12 are electrically connected directly or indirectly. For example, referring to Fig. 30, when the second converging portion 2213 is directly electrically connected to the first electrode post 12, for example, when the second converging portion 2213 is welded (e.g., laser welded) to the first electrode post 12, the structure of the battery core assembly 2 can be simplified, the number of parts can be reduced, the assembly flow can be simplified, and assembly efficiency can be improved. Here, the method and position of the direct electrical connection between the second converging portion 2213 and the first electrode post 12 are not limited. For example, the electrical connection position between the second converging portion 2213 and the first pole pillar 12 may be located on the first end wall 12111 and / or the first side wall 12113, and further, the electrical connection position between the second converging portion 2213 and the first end wall 12111 may extend along the length or width direction of the first end wall 12111, and further, the first end wall 12111 may have a first sunken groove 12112, and the electrical connection position between the second converging portion 2213 and the first end wall 12111 may be located within the first sunken groove 12112, etc. For corresponding technical effects, please refer to the descriptions of the above embodiments, and the description thereof will be omitted here.

[0274] In an optional technical solution, the conductive part 22 can further include an adapter sheet 222 if necessary, in which case the second converging part 2213 is indirectly electrically connected to the first pole 12. Specifically, referring to FIG. 31 , when the conductive part 22 includes the adapter sheet 222, the adapter sheet 222 is connected to the second converging part 2213, and the conductive part 22 is electrically connected to the first pole 12 via the adapter sheet 222. In this case, at least a portion of the adapter sheet 222 is accommodated in the first accommodating groove 12110, and in this example, at least a portion of the second converging part 2213 is also accommodated in the first accommodating groove 12110, but the first converging part 2212 may or may not be accommodated in the first accommodating groove 12110.

[0275] In the above technical solution, the active material coating portion 21 can be electrically connected to the first pole 12 via the first converging portion 2212, the second converging portion 2213, and the adapter sheet 222, in that order, and the electrical connection position between the conductive portion 22 and the first pole 12 is located on the adapter sheet 222. For example, the electrical connection can be achieved by welding (e.g., laser welding) the adapter sheet 222 to the first pole 12. Furthermore, the adapter sheet 222 and the tab sheet 2211 are two separate members that are connected by a method such as welding (e.g., ultrasonic welding).

[0276] In the above technical solution, at least a portion of the second converging portion 2213 and at least a portion of the adapter sheet 222 are all accommodated in the first accommodating groove 12110, thereby more fully utilizing the space within the first pole 12, further reducing the space occupied by the conductive part 22 within the casing 11, and improving the volumetric energy density of the battery cell 10. On the other hand, when at least a portion of the first converging portion 2212, at least a portion of the second converging portion 2213, and at least a portion of the adapter sheet 222 are all accommodated in the first accommodating groove 12110, more fully utilizing the space within the first pole 12, more effectively reducing the space occupied by the conductive part 22 within the casing 11, and further improving the volumetric energy density of the battery cell 10.

[0277] On the other hand, by using the adapter sheet 222 to achieve an indirect electrical connection between the second converging portion 2213 and the first electrode post 12, the adapter sheet 222 can be welded to the first electrode post 12 using the portion that avoids the second converging portion 2213, thereby firmly welding the adapter sheet 222 to the first electrode post 12, reducing the risk of weld cracks and further improving the reliability and stability of the battery cell 10. At the same time, by electrically connecting the first electrode post 12 and the tab sheet 2211 using the adapter sheet 222, the structure of the tab sheet 2211 can also be simplified.

[0278] Here, the method and location of direct electrical connection between the adapter sheet 222 and the first electrode post 12 are not limited. For example, the adapter sheet 222 and the first electrode post 12 are electrically connected by welding. For example, the electrical connection position between the adapter sheet 222 and the first electrode post 12 may be located on the first end wall 12111 and / or the first side wall 12113. Furthermore, the electrical connection position between the adapter sheet 222 and the first end wall 12111 may extend along the length or width direction of the first end wall 12111. Furthermore, the first end wall 12111 may have a first recessed groove 12112, and the electrical connection position between the adapter sheet 222 and the first end wall 12111 may be located within the first recessed groove 12112. For corresponding technical effects, please refer to the descriptions of the above embodiments, and further description thereof will be omitted here. When the electrical connection position between the adapter sheet 222 and the first pole 12 is located on the first end wall 12111 and / or the first side wall 12113, at least a portion of the adapter sheet 222 is accommodated in the first accommodating groove 12110, thereby simplifying the structure of the adapter sheet 222, reducing redundancy and reducing costs.

[0279] 31 and 32 , in the second embodiment, the active material application portion 21 includes a current collector 211 and an active material layer 212 provided on the current collector 211, the conductive portion 22 includes a tab portion 221 and an adapter sheet 222, the tab portion 221 includes a plurality of tab sheets 2211 electrically connected to the current collector 211, the plurality of tab sheets 2211 gather at a position close to the current collector 211 to form a first converging portion 2212, the plurality of tab sheets 2211 gather at a position away from the current collector 211 to connect to form a second converging portion 2213, and the adapter sheet 222 is electrically connected to the second converging portion 2213. When the accommodating portion 121 has a first accommodating groove 12110, at least a portion of the adapter sheet 222 can be accommodated in the first accommodating groove 12110 and is electrically connected to the first electrode post 12.

[0280] In the above technical solution, the second embodiment differs from the technical solution including the adapter sheet 222 of the first embodiment in that in the second embodiment, at least a portion of the adapter sheet 222 is accommodated in the first accommodating groove 12110, but the relative position of the tab portion 221 and the first accommodating groove 12110 is not limited, that is, at least a portion of the tab portion 221 can be accommodated in the first accommodating groove 12110, or the tab portion 221 can be located completely outside the first accommodating groove 12110, thereby meeting different structural design requirements.

[0281] In the above technical solution, at least a portion of the adapter sheet 222 is accommodated in the first accommodating groove 12110, allowing the adapter sheet 222 to occupy space within the first pole 12, thereby reducing the space occupied by the adapter sheet 222 within the casing 11, accommodating a larger-sized active material application portion 21, improving the volumetric energy density of the battery cell 10, and reducing the probability of a short circuit between the adapter sheet 222 and the active material application portion 21, thereby reducing the risk of a short circuit in the battery core assembly 2, and improving the stability and reliability of the battery cell 10.

[0282] Furthermore, by using the adapter sheet 222 to achieve an indirect electrical connection between the second converging portion 2213 and the first electrode post 12, the adapter sheet 222 can be welded to the first electrode post 12 using the portion that avoids the second converging portion 2213, thereby firmly welding the adapter sheet 222 to the first electrode post 12, reducing the risk of weld cracks and further improving the reliability and stability of the battery cell 10. At the same time, by electrically connecting the first electrode post 12 and the tab sheet 2211 using the adapter sheet 222, the structure of the tab sheet 2211 can also be simplified.

[0283] For example, in some optional examples, for example, in the above Example 1 or the following third embodiment, when the second converging portion 2213 is directly electrically connected to the first electrode pole 12, the conductive portion 22 may be composed of only the positive electrode tab and the negative electrode tab of each electrode assembly 2 a. For example, in some other examples, for example, in the above Example 1 or Example 2, or the following third or fourth embodiment, when the second converging portion 2213 is indirectly electrically connected to the first electrode pole 12 via the adapter sheet 222, the conductive portion 22 may be composed of the positive electrode tab, the negative electrode tab, and the adapter sheet 222 of each electrode assembly 2 a.

[0284] FIG. 33 is a diagram illustrating a converging design for multiple tabs of a battery core assembly 2 provided according to some embodiments of the present application. See FIGS. 32 and 33. In some embodiments, when the battery core assembly 2 includes two electrode assemblies 2a, the tab sheets 2211 of the two electrode assemblies 2a can converge together, and the convergence position is located at a central position between the two electrode assemblies 2a, forming a symmetrically converged shape (e.g., as shown in FIGS. 32 and 33(a)). In other embodiments, when the tab sheets 2211 of the two electrode assemblies 2a converge together, the convergence position may be located adjacent to one electrode assembly 2a, forming an asymmetrically converged shape (e.g., as shown in FIGS. 33(b) and 33(c)). Furthermore, the electrode assemblies 2a may have a fully extended tab shape (e.g., as shown in FIG. 33(a)) or a half-extended tab shape (e.g., as shown in FIGS. 32, 33(b), and 33(c)).

[0285] Of course, the tab sheets 2211 of the same polarity of the two electrode assemblies 2a do not have to converge together. For example, the tab sheets 2211 of each electrode assembly 2a may converge independently for the positive and negative electrodes, i.e., the positive electrode tabs of one electrode assembly 2a may converge independently, and the positive electrode tabs of the other electrode assembly 2a may converge independently, but this will not be described here.

[0286] It should be noted that the receiving portion 121 in the embodiment of the present application does not necessarily have to have the first receiving groove 12110, and for example, some other alternative embodiments are shown below.

[0287] For example, Figure 34 is a schematic local cross-sectional view of a battery cell 10 provided by some embodiments of the present application. Referring to Figure 34, in the embodiment of the present application, the accommodating portion 121 may be configured to include a second accommodating groove 12120, the surface of the first pole 12 facing away from the active material application portion 21 is the pole outer end surface 123, the groove opening of the second accommodating groove 12120 is formed in the pole outer end surface 123, the second accommodating groove 12120 communicates with the inside of the casing 11 through the first through hole 12130, and the conductive portion 22 is drilled in the first through hole 12130 and at least a portion of it is accommodated in the second accommodating groove 12120.

[0288] As can be understood, the second accommodating groove 12120 is a groove body, which has a groove-like structure with a certain depth. For example, when the first electrode pole 12 is installed on the upper end wall of the casing 11 and the electrode pole outer end surface 123 is the upper surface of the first electrode pole 12, the second accommodating groove 12120 is formed as an accommodating groove with an opening facing upward and groove walls recessed downward. Also, when the first electrode pole 12 is installed on the lower end wall of the casing 11 and the electrode pole outer end surface 123 is the lower surface of the first electrode pole 12, the second accommodating groove 12120 is formed as an accommodating groove with an opening facing downward and groove walls recessed upward.

[0289] In the above technical solution, referring to FIG. 34, by providing the second receiving groove 12120 on the first pole 12, the weight of the first pole 12 can be reduced to some extent, and the weight energy density of the battery cell 10 and the battery 100 can be improved. Meanwhile, the groove opening of the second receiving groove 12120 is formed on the pole outer end surface 123, and the pole outer end surface 123 is the surface of the first pole 12 away from the active material coated portion 21. Therefore, the second receiving groove 12120 can be used to It can be opened in a direction away from the application portion 21, and by accommodating at least a portion of the conductive portion 22 in the second accommodating groove 12120, the conductive portion 22 can be easily accommodated and organized through the groove opening of the second accommodating groove 12120, and electrical connection operations between the conductive portion 22 and the first pole 12 can be easily performed through the groove opening of the second accommodating groove 12120, thereby reducing the difficulty of producing the battery cell 10 and improving the production efficiency of the battery cell 10.

[0290] At the same time, because the second accommodating groove 12120 is connected to the inside of the casing 11 through the first through-hole 12130, the second accommodating groove 12120 can also be used as a buffering and temporary storage structure for the electrolyte, allowing more electrolyte to be accommodated in the casing 11. Since the electrolyte is consumed during the charging and discharging process of the battery cell 10, the service life of the battery cell 10 can be extended when there is more electrolyte. Furthermore, because the second accommodating groove 12120 is connected to the inside of the casing 11 through the first through-hole 12130, the second accommodating groove 12120 can also be used as a buffering structure for the gas generated inside the battery core assembly 2, reducing the expansion of the battery cell 10 and improving the reliability and stability of the battery cell 10.

[0291] It should be noted that when the accommodating portion 121 has a second accommodating groove 12120, the conductive portion 22 is drilled in the first through hole 12130, and at least a portion of the conductive portion 22 is accommodated in the second accommodating groove 12120, the electrical connection position between the conductive portion 22 and the first pole 12 is not limited.

[0292] For example, when the conductive portion 22 is drilled in the first through hole 12130 and at least a portion of it is accommodated in the second accommodating groove 12120, in some embodiments of the present application, the electrical connection position between the conductive portion 22 and the first pole 12 is located on the hole wall of the first through hole 12130 formed in the first pole 12.

[0293] In the above technical solution, the electrical connection position between the conductive part 22 and the first electrode post 12 is located on the hole wall of the first through hole 12130, so that the electrical connection operation between the conductive part 22 and the first electrode post 12 can be easily performed through the second accommodating groove 12120. Furthermore, when the electrical connection area between the conductive part 22 and the first electrode post 12 is relatively large, the electrical connection between the conductive part 22 and the first electrode post 12 can be used to realize sealing of the first through hole 12130, thereby saving sealing costs and reducing electrolyte leakage and saving sealing materials.

[0294] Specifically, by welding the conductive part 22 to the wall of the first through hole 12130 at the position where the first through hole 12130 and the second accommodating groove 12120 are connected, operation is made easier, and by controlling the welding marks, the welding marks and the conductive part 22 can be used to seal the first through hole 12130, thereby improving the problem of the electrolyte in the casing 11 leaking from the first through hole 12130.

[0295] Further, for example, when the conductive portion 22 is drilled in the first through-hole 12130 and at least a portion thereof is accommodated in the second accommodating groove 12120, in some other embodiments of the present application, the electrical connection position between the conductive portion 22 and the first electrode post 12 may also be located on the groove wall of the second accommodating groove 12120 formed by the first electrode post 12. This facilitates the electrical connection operation and, for example, can prevent conductive particles produced by welding from entering the casing 11 and causing problems such as short circuits when the conductive portion 22 is welded to the groove wall of the second accommodating groove 12120 formed by the first electrode post 12.

[0296] Specifically, Figure 35 is a local cross-sectional schematic diagram of a battery cell 10 provided by some embodiments of the present application. Referring to Figures 34 and 35, the first pole 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 close to the active material application portion 21, the second end wall 12121 and the second side wall 12123 surround each other to form a second accommodating groove 12120, a first through hole 12130 is opened in the second end wall 12121, and the electrical connection position between the conductive portion 22 and the first pole 12 is located on the second end wall 12121 and / or the second side wall 12123.

[0297] More specifically, the conductive portion 22 and the first electrode post 12 can be electrically connected by welding, and therefore the welding position is the electrical connection position between the conductive portion 22 and the first electrode post 12. In other embodiments of the present application, the conductive portion 22 and the first electrode post 12 can be electrically connected by other methods instead of welding, such as by using a conductive adhesive or installing a conductive pin, and the description thereof will be omitted here.

[0298] For the sake of simplicity, the following description will be given taking as an example that the conductive portion 22 and the first pole 12 are electrically connected by welding, and the welding position is the electrical connection position between the conductive portion 22 and the first pole 12. For example, in some embodiments, the electrical connection position between the conductive portion 22 and the first pole 12 may be located on the second end wall 12121 and / or the second side wall 12123, and the conductive portion 22 may be welded to at least one of the second end wall 12121 and the second side wall 12123.

[0299] In the above technical solution, the electrical connection position between the conductive portion 22 and the first electrode post 12 is located on at least one of the second end wall 12121 and the second side wall 12123. This allows the second receiving groove 12120 to not only receive at least a portion of the conductive portion 22, but also allows the groove wall of the second receiving groove 12120 to establish electrical connection with the conductive portion 22, thereby simplifying the structure of the first electrode post 12 and facilitating processing of the first electrode post 12. Furthermore, the first through-hole 12130 is formed in the second end wall 12121, allowing the conductive portion 22 to extend into the second receiving groove 12120 through the first through-hole 12130. This simplifies the structure of the conductive portion 22, reduces redundancy of the conductive portion 22, and reduces the cost of the conductive portion 22. In addition, the opening direction of the groove opening of the second accommodating groove 12120 can facilitate the electrical connection operation between the conductive part 22 and the groove wall of the second accommodating groove 12120 through the groove opening of the second accommodating groove 12120, reducing the difficulty of the electrical connection. Furthermore, by realizing the electrical connection with the conductive part 22 using the groove wall of the second accommodating groove 12120, the electrical connection area between the conductive part 22 and the first pole 12 can be set relatively large, improving the reliability and stability of the electrical connection and further improving the performance of the battery cell 10.

[0300] Furthermore, by positioning the electrical connection position between the conductive portion 22 and the first pole 12 within the second accommodating groove 12120, not only is it possible to prevent the electrical connection position from protruding outside the first pole 12 and occupying space other than the first pole 12, but the first pole 12 is protected at the electrical connection position, thereby improving the reliability and stability of the electrical connection between the conductive portion 22 and the first pole 12.

[0301] 34 and 35 , in some embodiments, the local shape of the conductive portion 22 matches the local shape of the second end wall 12121 and is closely positioned to achieve electrical connection, such that the electrical connection position between the conductive portion 22 and the second end wall 12121 extends along the length or width of the second end wall 12121. For example, if the second end wall 12121 is flat, the local portion of the conductive portion 22 may also be flat and be closely positioned to the second end wall 12121, and the closely positioned portion may be electrically connected by, for example, welding. This increases the electrical connection area and improves the reliability and stability of the electrical connection.

[0302] It should be noted that the shape of the second end wall 12121 is not limited, and may be, for example, a flat plate-like structure, an arc-shaped plate-like structure, etc. Here, when the second end wall 12121 has a flat plate-like structure, the second end wall 12121 is disposed at an angle with the axial direction R of the first electrode post 12, and may be, for example, a flat plate-like structure perpendicular to the axial direction R of the first electrode post 12, or may be, for example, an inclined flat plate-like structure not perpendicular to the axial direction R of the first electrode post 12, but the inclination direction is not limited.

[0303] 34 and 35, when the second end wall 12121 has a flat plate-like structure, the angle θ between the second end wall 12121 and the axial direction R of the first electrode post 12 is equal to 90°, that is, the second end wall 12121 and the active material coating portion 21 are equidistant from each other along the direction from the first through-hole 12130 to the second side wall 12123. This facilitates welding of the conductive portion 22 and the second end wall 12121.

[0304] 36 is a schematic local cross-sectional view of a battery cell 10 provided according to some embodiments of the present application. Referring to Fig. 36, the angle θ between the second end wall 12121 and the axial direction R of the first electrode post 12 is greater than 90°. That is, the second end wall 12121 extends at an angle from the first through-hole 12130 to the second side wall 12123 toward the active material-coated portion 21. This allows the conductive portion 22 to extend a longer distance along the second end wall 12121, improving 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 12 is 90° to 145°, and may be, for example, 100°, 110°, 120°, 130°, 140°, etc., which makes it easier to process the second end wall 12121 and to easily make electrical connection with the conductive portion 22, while also making relatively full use of the space within the first pole 12 to accommodate the conductive portion 22.

[0305] 37 is a schematic local cross-sectional view of a battery cell 10 provided according to some embodiments of the present application. Referring to FIG. 37, the angle θ between the second end wall 12121 and the axial direction R of the first electrode post 12 is smaller than 90°. That is, the second end wall 12121 extends at an angle away from the active material-coated portion 21 along the direction from the first through-hole 12130 to the second side wall 12123. This allows the conductive portion 22 to extend a longer distance along the second end wall 12121, improving 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 12 is 45° to 90°, and may be, for example, 50°, 60°, 70°, 80°, etc., which makes it easier to process the second end wall 12121 and to easily make electrical connection with the conductive portion 22, while also making relatively full use of the space within the first pole 12 to accommodate the conductive portion 22.

[0306] Of course, in other embodiments of the present application, the electrical connection position between the conductive portion 22 and the second end wall 12121 does not necessarily extend along the length or width of the second end wall 12121, but may be a plurality of discretely arranged points, for example, the conductive portion 22 may have a plurality of spaced apart portions that are respectively welded to the second end wall 12121, and the description of these will be omitted here.

[0307] Referring again to Figure 35, regardless of the specific value of the angle θ between the second end wall 12121 and the axial direction R of the first pole pillar 12, in any embodiment of the present application, when the conductive portion 22 is electrically connected to the second end wall 12121, a second sinking groove 12122 can be installed in the second accommodating groove 12120 as necessary, the sinking direction of the second sinking groove 12122 is a direction approaching the active material application portion 21, and at least a portion of the electrical connection position between the conductive portion 22 and the first pole pillar 12 is located within the second sinking groove 12122.

[0308] For example, the second accommodating groove 12120 has a second end wall 12121 and a second side wall 12123, a second sinking groove 12122 is provided in the second end wall 12121, and at least a portion of the electrical connection position between the conductive portion 22 and the second end wall 12121 is located within the second sinking groove 12122. In this case, the second sinking groove 12122 is a concave groove formed by a local portion of the second end wall 12121 sinking toward the end adjacent to the active material application portion.

[0309] In the above technical solution, the portion of the conductive part 22 located within the second sunken groove 12122 is installed to fit the shape of the second sunken groove 12122, is installed closely, and is electrically connected, so that the second sunken groove 12122 can be used to realize pre-positioning and position restriction of the electrical connection position of the conductive part 22, and the electrical connection can be performed with accurate positioning, which is beneficial to improving production efficiency and can improve the stability and reliability of the electrical connection position, thereby ensuring the reliability and stability of the charging and discharging operation of the battery cell 10.

[0310] It should be noted that in the embodiments of the present application, a portion of the conductive portion 22 can be fitted to the shape of the second side wall 12123 and be closely fitted to it, for example, if the second side wall 12123 is curved, a portion of the conductive portion 22 can also be curved and be closely fitted to the second side wall 12123, and the electrical connection (e.g., welding) can be performed at the closely fitted position so that the electrical connection position between the conductive portion 22 and the second side wall 12123 extends along the second side wall 12123. This can increase the electrical connection area and improve the reliability and stability of the electrical connection.

[0311] It should be noted that in other embodiments of the present application, the electrical connection position between the conductive portion 22 and the second side wall 12123 does not necessarily extend along the second side wall 12123, but may be, for example, a plurality of discretely arranged points, for example, the conductive portion 22 has a plurality of spaced apart portions that are each welded to the second side wall 12123, and the description of which will be omitted here.

[0312] As can be understood, the number of second side walls 12123 is not limited and may be determined according to the shape of the second receiving groove 12120, as long as one end of each second side wall 12123 remote from the groove opening of the second receiving groove 12120 is connected to the second end wall 12121. For example, if the cross-sectional shape of the second receiving groove 12120 is circular or elliptical, the second end wall 12121 is also circular or elliptical, and there is one second side wall 12123 formed in an annular shape and installed around the periphery of the second end wall 12121. For further example, if the cross-sectional shape of the second receiving groove 12120 is rectangular or racetrack-shaped, the second end wall 12121 is also rectangular or racetrack-shaped, and there are four second side walls 12123 connected to the four sides of the second end wall 12121, respectively.

[0313] It should also be noted that the second accommodating groove 12120 is not limited to a shape defined by the second end wall 12121 and the second side wall 12123. For example, in some embodiments, Figure 38 is a schematic local cross-sectional view of a battery cell 10 provided by some embodiments of the present application. Referring to Figure 38, one end of each second side wall 12123 away from the groove mouth of the second accommodating groove 12120 all extends to the first through hole 12130, so that the second accommodating groove 12120 is defined only by a plurality of second side walls 12123. In this case, the conductive portion 22 can be electrically connected to the second side wall 12123.

[0314] In some embodiments, referring to FIG. 50 , the receiving portion 121 may have a third receiving groove 12140 and a second receiving groove 12120 at the same time, the second receiving groove 12120 is located on the side of the third receiving groove 12140 away from the active material coated portion 21, the third receiving groove 12140 is a groove body, and the groove body has a groove-like structure with a certain depth, the groove opening of the third receiving groove 12140 is formed on the electrode post inner end surface 122 on the side close to the active material coated portion 21 of the first electrode post 12, and the groove opening of the second receiving groove 12120 is formed on the side of the first electrode post 12 close to the active material coated portion 21 of the first electrode post 12. The third accommodating groove 12140 is formed on the outer end surface 123 of the pole away from the adhesive application portion 21, and the third accommodating groove 12140 and the second accommodating groove 12120 are connected via the first through hole 12130. In this case, a part of the conductive portion 22 is located in the third accommodating groove 12140, and at the same time, the conductive portion 22 is further drilled into the first through hole 12130, and another part of the conductive portion 22 is located in the second accommodating groove 12120. This makes it possible to make relatively full use of the space within the first pole 12 and reduce the space occupied by the conductive portion 22 within the casing 11.

[0315] It should be noted that when the conductive portion 22 is connected to the second end wall 12121 or the second side wall 12123 by laser welding, referring again to Figure 38, the angle β between the portion of the conductive portion 22 used for welding and the axis of the first through hole 12130 should be set to be greater than 5°, which will reduce the problem of the laser entering the casing 11 through the first through hole 12130 and is advantageous for the welding operation. Furthermore, when the angle β between the portion of the conductive portion 22 used for welding and the axis of the first through hole 12130 is close to 5°, edge welding can be used, and the other portions can be used overlap welding.

[0316] Optionally, referring to FIG. 34, the second accommodating groove 12120 may be installed corresponding to the position of the mounting hole 113. In other words, on a projection plane perpendicular to the axial direction R of the first pole 12, the orthogonal projection of the second accommodating groove 12120 is located within the orthogonal projection range of the mounting hole 113. The second accommodating groove 12120 has a relatively large depth and can accommodate more conductive parts 22. As a result, the space occupied by the conductive parts 22 in the casing 11 can be significantly reduced.

[0317] In some embodiments, referring again to FIG. 34, the depth H3 of the second receiving groove 12120 along the axial direction R of the first pole 12 is equal to or greater than the minimum distance H4 from the pole outer end surface 123 to the mounting hole 113.

[0318] It should be noted that the specific shape of the second storage groove 12120 is not particularly limited and may be a regular or irregular shape, such as a cylindrical groove with a uniform cross section, such as a rectangular, elliptical, or racetrack-shaped cross section, a trapezoidal groove with a rectangular cross section and gradually varying cross-sectional dimensions, a hemispherical groove with a circular cross section and gradually varying cross-sectional dimensions, or a semi-elliptical groove with an elliptical cross section and gradually varying cross-sectional dimensions, etc. It should be noted that the racetrack shape described herein refers to, for example, the shape shown in Figure 40(b), where the two short sides of the rectangle are replaced with convex curves.

[0319] Therefore, the depth H3 of the second accommodating groove 12120 refers to the maximum depth of the second accommodating groove 12120 along the axial direction R of the first electrode post 12. In the axial direction R of the first electrode post 12, the depth H3 of the second accommodating groove 12120 is equal to or greater than the minimum distance H4 from the electrode post outer end surface 123 to the mounting hole 113. This allows full utilization of the volume of the first electrode post 12, and the second accommodating groove 12120 has a relatively large depth, which is advantageous for accommodating more conductive parts 22 and further reduces the space occupied by the conductive parts 22 within the casing 11, further improving the energy density of the battery cell 10 and further reducing the redundancy of the conductive parts 22 within the casing 11. At the same time, the relatively large depth of the second accommodating groove 12120 not only allows it to accommodate gas generated in the battery core assembly 2 and ensure the reliability and stability of the battery cell 10, but also allows it to accommodate more electrolyte and ensure the service life of the battery cell 10.

[0320] It should be noted that the volume of the second receiving groove 12120 is not limited, and for example, in some specific examples, the volume of the second receiving groove 12120 (referred to as a third volume V4) for receiving the conductive portion 22 is 298 mm 3 or more, so that the second accommodating groove 12120 can have a relatively sufficient space to accommodate the conductive portion 22 and facilitate welding of the conductive portion 22 to the first terminal post 12. On the other hand, when the third volume V4 of the second accommodating groove 12120 is 298 mm 3 If the third volume V4 of the second accommodating groove 12120 is less than 300 mm, the capacity of the second accommodating groove 12120 to accommodate the conductive portion 22 becomes relatively low, making it difficult to weld the conductive portion 22 to the first terminal post 12. For example, if the third volume V4 of the second accommodating groove 12120 is 300 mm 3 , 400mm 3 , 500mm 3 , 600mm 3 , 700mm 3 , 800mm 3 , 1000mm 3 etc. may also be used.

[0321] It should be noted 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 (referred to as a fourth volume V6) required for the second receiving groove 12120 to receive other components (e.g., the first cover plate 13 and the second cover plate 14 described in this specification) other than the conductive portion 22, i.e., V4 = V5 - V6. For example, in some specific examples, the total volume V5 of the second receiving groove 12120 is 1400 mm 3 ~1500mm 3 This allows the second accommodating groove 12120 to have more sufficient space to accommodate the conductive portion 22 and other components. For example, the total volume V5 of the second accommodating groove 12120 is 1420 mm 3 , 1440mm 3 , 1460mm 3 , 1480mm 3 , 1490mm 3 etc. may also be used.

[0322] In the embodiments of the present application, there are no limitations on the shape of the first through holes 12130, the number of the first through holes 12130, and the relative positional relationship between the first through holes 12130 and the second receiving grooves 12120.

[0323] For example, Figure 39 is a local enlarged view of the W portion in Figure 3, and Figure 40 is an orthographic view of several types of first pole posts 12 provided by some embodiments of the present application. Referring to Figures 39 and 40, in the embodiments of the present application, with regard to the shape of the first through hole 12130, the shape of the first through hole 12130 may be elongated so as to fit the sheet-like local shape of the conductive portion 22, thereby being advantageous for penetrating the sheet-like local portion of the conductive portion 22. At the same time, when the first through hole 12130 is elongated, the second accommodating groove 12120 may be configured with a shape in which the cross-sectional length is greater than the width, such as a rectangle, oval, or racetrack shape. In this case, the length of the first through hole 12130 can be aligned with the cross-sectional length of the second accommodating groove 12120, thereby making full use of the space. Furthermore, the weld mark formed by welding the conductive portion 22 to the first pole 12 may be an elongated weld mark parallel to the length of the first through hole 12130, so as to improve the reliability of the weld and increase the current-passing capacity. For example, when an elongated weld mark is formed by welding the conductive portion 22 to the second end wall 12121, the width of the weld mark may be 6 mm or more, and the distance between the weld mark and the second side wall 12123 may be 1 mm or more, in order to ensure the convenience and reliability of the weld and maintain the current-passing capacity of the battery cell 10.

[0324] Regarding the size and number of the first through holes 12130, in the embodiments of the present application, the opening size and specific position of the first through holes 12130 in the second accommodating groove 12120 are not limited, and related designs can be made according to the number of first through holes 12130. For example, the width of the first through hole 12130 may be 2 mm or more, which is advantageous for the passage of the conductive part 22. For example, when only one first through hole 12130 is opened in the second accommodating groove 12120, in some examples, as shown in FIGS. 39 and 40, the first through hole 12130 may be disposed centrally relative to the second accommodating groove 12120. In other examples, as shown in FIG. 41, which is a schematic local cross-sectional view of a battery cell 10 provided according to some embodiments of the present application, the first through hole 12130 may be disposed off-center relative to the second accommodating groove 12120. For example, in some embodiments, referring to FIG. 41, the first through hole 12130 can be opened at the edge of the second end wall 12121 so as to be located close to the second side wall 12123, thereby increasing the available area of ​​the second end wall 12121 and increasing the welding area between the conductive portion 22 and the second end wall 12121.

[0325] As will be understood, after the conductive portion 22 passes through the first through hole 12130, it is folded back so as to fit closely to the second end wall 12121, but the folding direction is not limited. For example, if the first through hole 12130 is centrally located relative to the second accommodating groove 12120, the conductive portion 22 can be folded back toward any side of the first through hole 12130 after passing through the first through hole 12130 (see FIG. 39 ), thereby appropriately reducing the size of the second accommodating groove 12120 and improving the compactness and structural strength of the structure. Alternatively, FIG. 42 is a schematic cross-sectional view of a battery cell 10 provided according to some embodiments of the present application. Referring to FIG. 42 , after the conductive portion 22 passes through the first through hole 12130, it can be folded back toward opposite sides at the same time, thereby reducing the thickness of the welding point, reducing heat input during welding, and reducing problems such as particle scattering.

[0326] For example, when the second accommodating groove 12120 has a plurality of first through holes 12130, the plurality of first through holes 12130 are arranged so that their length directions are parallel or nearly parallel to each other so as to fully utilize the space. In this case, the folding direction of the conductive portion 22 after passing through the first through holes 12130 can be set based on the relative positional relationship of the plurality of first through holes 12130. For example, when the second accommodating groove 12120 has two first through holes 12130 that are spaced apart from each other (see FIG. 43 ), the two conductive portions 22 that pass through the two first through holes 12130 can be folded back in directions that approach each other, and when the second accommodating groove 12120 has two first through holes 12130 that are spaced apart from each other, the two conductive portions 22 that pass through the two first through holes 12130 can be folded back in directions that move away from each other.

[0327] As can be understood, when there are multiple first through holes 12130 opened in the second accommodating groove 12120, the number of first pole posts 12 can be appropriately reduced, thereby reducing costs and processes.

[0328] Also, in some embodiments, referring to Figures 41 and 42, the first through hole 12130 can be positioned centrally relative to the active material application portion 21, but the position of the first through hole 12130 relative to the second accommodating groove 12120 is not limited and may be positioned centrally or off-center, and since the first through hole 12130 is positioned centrally relative to the active material application portion 21, the conductive portion 22 can converge in accordance with the center line position of the active material application portion 21.

[0329] 42 , in some embodiments, a second seal 6 may be installed in the first through-hole 12130 to alleviate the problem of electrolyte in the casing 11 leaking from the first through-hole 12130. The material, shape, and connection method of the second seal 6 with the first through-hole 12130 are not limited. For example, the seal 6 may be a metal member made of the same material as the first electrode post 12 and the conductive part 22, and may be welded and fitted to the wall surface of the first through-hole 12130 of the first electrode post 12 to seal the first through-hole 12130. For example, the seal 6 may be a plastic member that is inserted and fitted into the first through-hole 12130 to seal the first through-hole 12130. In the embodiments of the present application, any of these may be designed according to actual requirements without any limitation.

[0330] Figure 44 is a structural exploded view of a battery cell provided by some embodiments of the present application, Figure 45 is a local cross-sectional schematic view of a casing assembly provided by some embodiments of the present application, and Figure 46 is a structural exploded view of the casing assembly shown in Figure 45. Referring to Figures 44 to 46, in the embodiments of the present application, when the accommodating portion 121 has the second accommodating groove 12120 of any of the above embodiments, optionally, the casing assembly 1 may further include a first cover plate 13, the first cover 13 being fitted with the first pole 12 and sealing the groove opening of the second accommodating groove 12120, and the first cover plate 13 is electrically connected to the first pole 12.

[0331] In the above technical proposal, by installing the first cover plate 13 so as to seal the groove opening of the second accommodating groove 12120, it is possible to prevent the electrolyte in the casing 11 from leaking from the groove opening of the second accommodating groove 12120. Furthermore, by sealing the groove opening of the second accommodating groove 12120 and electrically connecting the first electrode post 12 with the first cover plate 13, it is possible to easily realize an indirect electrical connection between the first electrode post 12 and the bus member using the first cover plate 13, which is advantageous for increasing the connection area of ​​the electrical connection point and further reducing the resistance of the electrical connection point.

[0332] It should be noted that the method and position of fitting the first cover plate 13 and the first pole 12 are not limited as long as the groove opening of the second accommodating groove 12120 of the first cover plate 13 can be sealed. For example, in some embodiments, referring to Fig. 24, the first cover plate 13 may be welded to the first pole 12, and during processing, the conductive portion 22 may first be passed through the first through-hole 12130 and welded to the groove wall of the second accommodating groove 12120, and then the first cover plate 13 and the first pole 12 may be welded to seal the groove opening of the second accommodating groove 12120.

[0333] It should be further explained that the specific configuration of the first cover plate 13 is not limited. For example, in some optional embodiments, Fig. 47 is a structural exploded view of the first cover plate shown in Fig. 46. Referring to Figs. 45 to 47, the first cover plate 13 includes a first conductive member 131 and a second conductive member 132 made of different materials, the first conductive member 131 is fitted with and electrically connected to the first pole 12, and the second conductive member 132 is electrically connected to the first conductive member 131.

[0334] In the above technical solution, the first cover plate 13 is installed in a composite form, and the first conductive member 131 is installed so that it is made of the same material as the first pole 12, which facilitates electrical connection between the first conductive member 131 and the first pole 12. For example, the first conductive member 131 and the first pole 12 can be reliably and stably connected by welding. Furthermore, because the second conductive member 132 and the first conductive member 131 are made of a different material, the second conductive member 132 can be used to easily electrically connect to bus members made of a different material from the first pole 12. For example, the second conductive member 132 can be reliably and stably connected to bus members made of the same material as the second conductive member 132 by welding.

[0335] For example, if the first electrode post 12 is a negative electrode post, the first electrode post 12 is a copper post, and the bus member is an aluminum sheet, the first conductive member 131 can be made of copper and the second conductive member 132 can be made of aluminum. In this case, the first electrode post 12 and the first conductive member 131 can be made of the same material and effectively welded together, and the second conductive member 132 and the bus member can be made of the same material and effectively welded together, thereby effectively realizing an indirect electrical connection between the first electrode post 12 and the bus member via the first cover plate 13. Furthermore, the first electrode post 12 and the first conductive member 131 are welded together from copper, which has excellent fluidity, is less likely to crack, and improves the sealing effect of the welded joints.

[0336] 45 to 47 again, in some optional examples, the first conductive member 131 is located between the second accommodating groove 12120 and the second conductive member 132. In the above technical solution, the first conductive member 131 is located between the second accommodating groove 12120 and the second conductive member 132, so that the second accommodating groove 12120 and the second conductive member 132 are separated from each other. As a result, when the electrolyte in the casing 11 enters the second accommodating groove 12120 through the first through-hole 12130, the first conductive member 131 can be used to prevent that portion of the electrolyte from coming into contact with the second conductive member 132, thereby solving the problem of the electrolyte corroding the second conductive member 132.

[0337] It should be noted that the method of fitting the first conductive member 131 and the second conductive member 132 is not limited. For example, in some embodiments, referring to FIGS. 45 to 47, the first conductive member 131 has a second groove 1311, the second conductive member 132 is fitted into the second groove 1311, and the groove opening of the second groove 1311 is formed on the surface of the first conductive member 131 away from the second receiving groove 12120 so that the second conductive member 132 is exposed from the groove opening of the second groove 1311. Alternatively, in other embodiments, the method of connecting the first conductive member 131 and the second conductive member 132 may be a fastening connection, an engagement, or the like.

[0338] It should be further explained that the second conductive member 132 being "exposed" from the groove opening of the second groove 1311 means that the first conductive member 131 does not block the second conductive member 132 at the groove opening position of the second groove 1311, and the second conductive member 132 does not need to protrude from the groove opening of the second groove 1311; for example, the second conductive member 132 may be positioned flush with the surface of the first conductive member 131 facing away from the second accommodating groove 12120, or the second conductive member 132 may protrude from the surface of the first conductive member 131 facing away from the second accommodating groove 12120.

[0339] In the above technical solution, the second conductive member 132 is fitted into the first conductive member 131, which reduces the difficulty of assembling the first conductive member 131 and the second conductive member 132 and improves the fitting stability and convenience of the first conductive member 131 and the second conductive member 132. It also reduces the thickness of the first cover plate 13, which reduces the space occupied by the first cover plate 13 and improves the space utilization rate of the battery cell 10. On the other hand, the second conductive member 132 can be exposed through the opening of the second groove 1311 on the surface of the first conductive member 131 facing away from the second receiving groove 12120, which is advantageous for achieving electrical connection between the second conductive member 132 and the bus member on the outer side of the first pole 12.

[0340] Furthermore, since the groove opening of the second groove 1311 is formed on the surface of the first conductive member 131 that is away from the second accommodating groove 12120, it is suggested that the second groove 1311 opens in the direction away from the active material application portion 21. As a result, a portion of the groove wall of the second groove 1311 of the first conductive member 131 is located between the second accommodating groove 12120 and the second conductive member 132, thereby separating the second accommodating groove 12120 and the second conductive member 132 and preventing contact between the electrolyte that has entered the second groove 1311 and the second conductive member 132, thereby reducing leakage of the electrolyte.

[0341] Of course, in other embodiments, the first cover plate 13 does not have to be a composite type made of multiple materials. For example, in other embodiments of the present application, Fig. 48 is a schematic cross-sectional view of a battery cell provided by some embodiments of the present application, and Fig. 49 is an exploded view of the battery cell shown in Fig. 48. By combining Fig. 48 and Fig. 49, the entire first cover plate 13 can be installed in a non-composite type made of the same material, for example, to fit the positive pole, and the description thereof will be omitted here.

[0342] 45 to 47 again, in some embodiments, the first cover plate 13 is further fitted into the groove opening of the second accommodating groove 12120. In the above technical solution, fitting the first cover plate 13 into the second accommodating groove 12120 reduces the difficulty of assembling the first cover plate 13 and the first pole 12, improves the assembly stability and connection reliability and convenience between the first cover plate 13 and the first pole 12, and reduces the space occupied by the first cover plate 13 other than the first pole 12. In addition, because the first cover plate 13 is fitted into the groove opening of the second accommodating groove 12120, the second accommodating groove 12120 has a relatively sufficient space for accommodating the conductive part 22.

[0343] Of course, in other embodiments of the present application, the method of fitting the first cover plate 13 and the first pole 12 is not limited to being fitted into the second accommodating groove 12120, and the first cover plate 13 may also be fitted over the outside of the first pole 12, that is, directly covering the groove opening of the second accommodating groove 12120 to facilitate fitting with the bus member of the battery 100, and is not limited in this embodiment.

[0344] 45 and 46 again, optionally, in an embodiment of the present application, at least a part of the wall surface where the groove opening of the second accommodating groove 12120 of the first pole 12 is formed is a guide slope 12126, and the guide slope 12126 is used to guide the fitting of the first cover plate 13 with the groove opening of the second accommodating groove 12120. In the above technical solution, by processing the wall surface of the groove opening of the second accommodating groove 12120 into a slope having a guide function, it is possible to reduce the difficulty of assembling the first cover plate 13 and the second accommodating groove 12120 and improve the assembly efficiency of the first cover plate 13 and the second accommodating groove 12120. Furthermore, when the first cover plate 13 is welded to the guide slope 12126, the area of ​​the welding point is increased, which improves the reliability of the welding connection between the first cover plate 13 and the first pole 12 and reduces the problem of the molten pool collapsing or the laser entering the first pole 12 during welding.

[0345] 45 to 47, the second accommodating groove 12120 includes a first groove section 12124 and a second groove section 12125 located on the side of the first groove section 12124 that is closer to the pole outer end surface 123. The cross-sectional area of ​​the second groove section 12125 is larger than that of the first groove section 12124, so the second accommodating groove 12120 is formed in a stepped groove shape, and the connection position between the first groove section 12124 and the second groove section 12125 forms a stepped surface 12127. Therefore, when the first cover plate 13 is fitted into the second accommodating groove 12120, it is fitted into the second groove section 12125 and is supported by the stepped surface 12127.

[0346] In the above technical solution, by configuring the second accommodating groove 12120 in a stepped groove format, the first cover plate 13 can be stably fitted into the groove opening position of the second accommodating groove 12120, thereby improving the connection stability between the first cover plate 13 and the first pole 12; and by limiting the groove depth of the first groove step 12124, a relatively sufficient space can be provided in the second accommodating groove 12120 to accommodate the conductive part 22.

[0347] Furthermore, when the wall surface on which the groove mouth of the second accommodating groove 12120 of the first pole post 12 is formed is the guide slope 12126, the cross-sectional area of ​​the second groove step 12125 is set to gradually increase along the direction approaching the pole post outer end surface 123, so that the side wall of the second groove step 12125 forms the guide slope 12126, thereby facilitating processing and meeting the guide requirements simply and effectively.

[0348] 45 to 47 again, in the embodiments of the present application, the first cover plate 13 may be provided with stress relief grooves 133 if necessary, and the stress relief grooves 133 are located in the outer circumferential region of the first cover plate 13 to help relieve stress on the first cover plate 13. In the above technical solution, the provision of the stress relief grooves 133 on the first cover plate 13 relieves stress generated during the processing of the first cover plate 13 itself or during the electrical connection between the first cover plate 13 and the first pole 12, so as to alleviate problems such as deformation and damage caused by stress on the first cover plate 13.

[0349] Specifically, when the first cover plate 13 is fitted into the second receiving groove 12120 and welded, the stress relief groove 133 relieves stress generated during welding, improves lateral heat conduction, and reduces the possibility of damage or deformation of the first cover plate 13. At the same time, if the first cover plate 13 is a composite type including the first conductive member 131 and the second conductive member 132, the stress relief groove 133 is provided in the first conductive member 131 and located at the outer circumferential region of the second conductive member 132. Therefore, when the first conductive member 131 is fitted into the second receiving groove 12120 and welded, the stress relief groove 133 relieves stress generated during welding, improves lateral heat conduction, and reduces the possibility of damage or deformation of the second conductive member 132. In addition, when the second conductive member 132 and the first conductive member 131 are fitted and welded, the stress relief groove 133 releases the stress generated by the welding, improves the lateral conduction of heat, and reduces the probability of deformation of the first conductive member 131 or the first conductive member 131 being unable to be fitted into the second accommodating groove 12120.

[0350] Referring to Figures 48 and 49, in the embodiment of the present application, the casing assembly 1 may further be provided with a second cover plate 14 as needed, which covers the outside of the first through hole 12130 and is simultaneously positioned outside the conductive portion 22 in the second accommodating groove 12120.

[0351] It should be noted that when the casing assembly 1 includes the second cover plate 14, the casing assembly 1 may also include the first cover plate 13, or may not also include the first cover plate 13. Furthermore, when the casing assembly 1 includes both the second cover plate 14 and the first cover plate 13, the first cover plate 13 may be a composite type using multiple types of materials, or a non-composite type using the same material.

[0352] In the above technical solution, at least a portion of the conductive portion 22 is located in the second accommodating groove 12120, and the second cover plate 14 covers that portion of the conductive portion 22, and the second cover plate 14 is further configured to cover the first through hole 12130. This alleviates the problem of the electrolyte in that portion overflowing from the first pole 12 when the electrolyte enters the second accommodating groove 12120 through the first through hole 12130, thereby improving the reliability of the battery cell 10.

[0353] 48 and 49, when a portion of the conductive portion 22 is sandwiched between the second cover plate 14 and the second end wall 12121, laser welding can be used to weld together the three components of the portion of the conductive portion 22, the second cover plate 14, and the second end wall 12121, in order to improve the reliability of the connection between the first pole 12 and the conductive portion 22. Furthermore, because the second cover plate 14 can press the conductive portion 22, the second cover plate 14 can improve the stability with which the conductive portion 22 is accommodated in the second accommodating groove 12120.

[0354] In the present embodiment, the first electrode post 12 may be an integrally molded electrode post or a separately molded composite electrode post. Referring again to Figures 48 and 49, for example, the first electrode post 12 may include a first electrode post portion 124 and a second electrode post portion 125 made of different materials and electrically connected to each other, the second electrode post portion 125 being located on the side of the first electrode post portion 124 away from the active material coated portion 21, the receiving portion 121 being attached to the first electrode post portion 124, or the receiving portion 121 being attached to the first electrode post portion 124 and the second electrode post portion 125, and the conductive portion 22 being electrically connected to the first electrode post portion 124.

[0355] In the above technical solution, the first pole 12 is configured in a composite form using a combination of different materials, and the first pole portion 124 located on the inside is used to fit and electrically connect with the conductive portion 22, and the second pole portion 125 located on the outside is used to electrically connect with bus members, etc. This is advantageous for assembling and electrically connecting the first pole 12 and related members, reduces mutual interference between the electrical connection position between the first pole 12 and the conductive portion 22 and the electrical connection position between the first pole 12 and the bus members of the battery 100, and improves the reliability and stability of the battery cell 10.

[0356] For example, if the material of the conductive part 22 is different from the material of the bus member, the first electrode post part 124 can be installed so that it is made of the same material as the conductive part 22, and the second electrode post part 125 can be installed so that it is made of the same material as the bus member. This allows welding between the second electrode post part 125 and the bus member, and welding between the first electrode post part 124 and the conductive part 22, which is advantageous in improving the reliability and stability of the electrical connection between the conductive part 22 and the first electrode post 12, and between the first electrode post 12 and the bus member.

[0357] Furthermore, when the first pole 12 is of the composite type as described above and has the second receiving groove 12120 and the first through-hole 12130 as described above, in some embodiments, the casing assembly 1 can also include the second cover plate 14 as described above. In this case, the second cover plate 14 and the first pole portion 124 can be made of the same material, and the first pole portion 124 can be electrically connected to the second cover plate 14, thereby improving the reliability and stability of the electrical connection between the first pole portion 124 and the second cover plate 14. For example, the first pole portion 124 and the second cover plate 14 can be connected by welding.

[0358] For example, referring to Figures 48 and 49, if the first electrode pole 12 is a negative electrode pole, the first electrode pole portion 124 is made of copper material, the second electrode pole portion 125 is made of aluminum material, and the bus member is an aluminum sheet, the second cover plate 14 can be installed on the copper material and the first cover plate 13 can be installed on the aluminum material. In this case, the second cover plate 14 and the first electrode pole portion 124 may be made of the same material and effectively welded, the second electrode pole portion 125 and the first cover plate 13 may be made of the same material and effectively welded, and the first cover plate 13 and the bus member may be made of the same material and effectively welded.

[0359] In the examples of the present application, when the accommodating portion 121 has a second accommodating groove 12120, the engagement between the battery core assembly 2 and the second accommodating groove 12120 is not limited depending on the configuration of the battery core assembly 2, and includes, for example, the following two examples of the third and fourth embodiments, but is not limited thereto.

[0360] 50 is a schematic cross-sectional view of a battery cell 10 according to some embodiments of the present application. Referring to FIG. 50 , in a third embodiment, the active material applied portion 21 includes a current collector 211 and an active material layer 212 provided on the current collector 211. The conductive portion 22 is electrically connected to the current collector 211 and includes a tab portion 221 including a plurality of tab sheets 2211. The plurality of tab sheets 2211 gather at a position close to the current collector 211 to form a first converging portion 2212. The plurality of tab sheets 2211 gather at a position away from the current collector 211 to connect to form a second converging portion 2213. The first converging portion 2212 connects the second converging portion 2213 to the active material applied portion 21. When the accommodating portion 121 has a second accommodating groove 12120, at least a portion of the second converging portion 2213 is accommodated in the second accommodating groove 12120.

[0361] It should be noted that the specific configuration of the battery core assembly 2 in the third embodiment is basically the same as the specific configuration of the battery core assembly 2 in the above-mentioned Example 1, and the description of Example 1 can be referred to, so the description thereof will be omitted here. In the third embodiment, the tab portion 221 includes a second converging portion 2213 formed by gathering and connecting a plurality of tab sheets 2211, so that at least a portion of the second converging portion 2213 can be accommodated in the second accommodating groove 12120, facilitating the assembly of the conductive portion 22 and the first pole 12.

[0362] In some optional examples, referring to FIG. 50, the position where the first convergent portion 2212 and the second convergent portion 2213 are connected can be set corresponding to the first through hole 12130. In other words, on the projection plane perpendicular to the axial direction R of the first pole pillar 12, the orthogonal projection of the connection position between the first convergent portion 2212 and the second convergent portion 2213 is located within the orthogonal projection range of the first through hole 12130, so that the second convergent portion 2213 can be easily extended to the first through hole 12130 in a short distance and enter the second accommodating groove 12120, thereby reducing redundancy and saving costs.

[0363] It should be understood that the converging position of the tab sheet 2211 can be designed based on the position of the first through-hole 12130, for example, by adopting the above-mentioned symmetrical converging form or asymmetrical converging form, and the connection position between the first converging portion 2212 and the second converging portion 2213 can be set corresponding to the first through-hole 12130, but the description thereof will be omitted here. Also, as mentioned above, when the second converging portion 2213 forms a plate-like structure by ultrasonic tack welding, it is easy for the second converging portion 2213 to pass through the first through-hole 12130.

[0364] Referring to Figure 50, in the third embodiment, the accommodating portion 121, in addition to having the second accommodating groove 12120, may also have a third accommodating groove 12140 located on the side of the second accommodating groove 12120 that is close to the active material application portion 21, the surface of the first pole 12 facing the active material application portion 21 is the pole inner end face 122, and the groove opening of the third accommodating groove 12140 is formed in the pole inner end face 122, and the third accommodating groove 12140 and the second accommodating groove 12120 are connected via the first through hole 12130, and in this case, at least a portion of the first converging portion 2212 may be accommodated in the third accommodating groove 12140.

[0365] In the above technical solution, at least a portion of the first converging portion 2212 of the tab portion 221 is accommodated in the third accommodating groove 12140, and at least a portion of the second converging portion 2213 is accommodated in the second accommodating groove 12120, thereby making better use of the space within the first pole 12 to accommodate a larger-sized active material applied portion 21, further reducing the space occupied by the tab portion 221 within the casing 11, improving the energy density of the battery cell 10, and better reducing the redundancy of the tab portion 221 within the casing 11, further reducing the probability of a short circuit between the tab portion 221 and the active material applied portion 21, and further reducing the risk of the tab portion 221 being inserted backwards into the active material applied portion 21.

[0366] It should be noted that the specific shape of the third receiving groove 12140 is not limited, and may be a regular or irregular shape, such as a cylindrical groove with a uniform cross-section, such as a rectangular, elliptical, or racetrack-shaped cross-section, a trapezoidal groove with a rectangular cross-section and gradually varying cross-sectional dimensions, a hemispherical groove with a circular cross-section and gradually varying cross-sectional dimensions, or a semi-elliptical groove with an elliptical cross-section and gradually varying cross-sectional dimensions, etc. In the embodiments of the present application, the third receiving groove 12140 may be configured with a cross-sectional shape in which the length is greater than the width, such as a rectangular, elliptical, or racetrack-shaped shape, which is advantageous for receiving the first converging portion 2212.

[0367] In the third embodiment, the second converging portion 2213 is electrically connected directly or indirectly to the first electrode post 12. For example, when the second converging portion 2213 is electrically connected directly to the first electrode post 12, for example, when the second converging portion 2213 is welded to the first electrode post 12, the structure of the battery core assembly 2 can be simplified, the number of components can be reduced, the assembly flow can be simplified, and assembly efficiency can be improved. Here, the method and position of the direct electrical connection between the second converging portion 2213 and the first electrode post 12 are not limited. For example, the electrical connection position between the second converging portion 2213 and the first pole 12 may be located on the second end wall 12121 and / or the second side wall 12123, and further, the electrical connection position between the second converging portion 2213 and the second end wall 12121 may extend along the length or width direction of the second end wall 12121, and further, the second end wall 12121 may have a second sunken groove 12122, and the electrical connection position between the second converging portion 2213 and the second end wall 12121 may be located within the second sunken groove 12122, etc. For corresponding technical effects, please refer to the descriptions of the above embodiments, and the description thereof will be omitted here.

[0368] In an optional technical solution, the conductive portion 22 can further include an adapter sheet 222 if necessary, in which case the second converging portion 2213 is indirectly electrically connected to the first electrode post 12. Specifically, FIG. 51 is a schematic local cross-sectional view of a battery cell 10 provided according to some embodiments of the present application. Referring to FIG. 51, when the conductive portion 22 includes an adapter sheet 222, the adapter sheet 222 is connected to the second converging portion 2213, and the conductive portion 22 is electrically connected to the first electrode post 12 through the adapter sheet 222. In this case, at least a portion of the adapter sheet 222 is accommodated in the second accommodating groove 12120, and in this example, at least a portion of the second converging portion 2213 is also accommodated in the second accommodating groove 12120.

[0369] In the above technical solution, the active material coating portion 21 can be electrically connected to the first pole 12 via the first converging portion 2212, the second converging portion 2213, and the adapter sheet 222, in that order, and the electrical connection position between the conductive portion 22 and the first pole 12 is located on the adapter sheet 222. For example, the electrical connection can be achieved by welding (e.g., laser welding) the adapter sheet 222 to the first pole 12. Furthermore, the adapter sheet 222 and the tab sheet 2211 are two separate members that are connected by a method such as welding (e.g., ultrasonic welding).

[0370] In the above technical solution, at least a portion of the second converging portion 2213 and at least a portion of the adapter sheet 222 are accommodated in the second accommodating groove 12120, thereby making better use of the space within the first pole 12 and further reducing the space occupied by the conductive portion 22 within the casing 11, thereby further improving the volumetric energy density of the battery cell 10. In addition, installing the adapter sheet 222 with a sheet structure makes it easy for the adapter sheet 222 to pass through the first through-hole 12130 and extend into the second accommodating groove 12120.

[0371] Furthermore, by using the adapter sheet 222 to achieve an indirect electrical connection between the second converging portion 2213 and the first electrode post 12, the adapter sheet 222 can be welded to the first electrode post 12 using the portion that avoids the second converging portion 2213, thereby firmly welding the adapter sheet 222 to the first electrode post 12, reducing the risk of weld cracks and further improving the reliability and stability of the battery cell 10. At the same time, by electrically connecting the first electrode post 12 and the tab sheet 2211 using the adapter sheet 222, the structure of the tab sheet 2211 can also be simplified.

[0372] Here, the method and location of direct electrical connection between the adapter sheet 222 and the first electrode post 12 are not limited. For example, the adapter sheet 222 and the first electrode post 12 are electrically connected by welding. For example, the electrical connection position between the adapter sheet 222 and the first electrode post 12 may be located on the second end wall 12121 and / or the second side wall 12123. Furthermore, the electrical connection position between the adapter sheet 222 and the second end wall 12121 may extend along the length or width direction of the second end wall 12121. Furthermore, the second end wall 12121 may have a second recessed groove 12122, and the electrical connection position between the adapter sheet 222 and the second end wall 12121 may be located within the second recessed groove 12122. For corresponding technical effects, refer to the descriptions of the above embodiments, and further description thereof will be omitted here. When the electrical connection position between the adapter sheet 222 and the first pole 12 is located on the second end wall 12121 and / or the second side wall 12123, at least a portion of the adapter sheet 222 is accommodated in the second accommodating groove 12120, thereby simplifying the structure of the adapter sheet 222, reducing redundancy and reducing costs.

[0373] 51 , in the fourth embodiment, the active material application portion 21 includes a current collector 211 and an active material layer 212 provided on the current collector 211, and the conductive portion 22 includes a tab portion 221 including a plurality of tab sheets 2211 electrically connected to the current collector 211, and an adapter sheet 222, where the plurality of tab sheets 2211 gather at a position close to the current collector 211 to form a first converging portion 2212, and the plurality of tab sheets 2211 gather at a position away from the current collector 211 to connect to form a second converging portion 2213, and the adapter sheet 222 is electrically connected to the second converging portion 2213. When the accommodating portion 121 has a second accommodating groove 12120, at least a portion of the adapter sheet 222 can be accommodated in the second accommodating groove 12120 and is electrically connected to the first electrode post 12.

[0374] In the above technical solution, the fourth embodiment differs from the technical solution including the adapter sheet 222 of the third embodiment in that in the fourth embodiment, at least a portion of the adapter sheet 222 is accommodated in the second accommodating groove 12120, but the relative position of the tab portion 221 and the second accommodating groove 12120 is not limited, that is, at least a portion of the tab portion 221 can be accommodated in the second accommodating groove 12120, or the tab portion 221 can be located completely outside the second accommodating groove 12120, thereby meeting different structural design requirements.

[0375] In the above technical solution, by accommodating at least a portion of the adapter sheet 222 in the second accommodating groove 12120, the adapter sheet 222 can occupy space within the first pole 12, thereby reducing the space occupied by the adapter sheet 222 within the casing 11 to accommodate a larger-sized active material application portion 21, improving the energy density of the battery cell 10, and reducing the probability of a short circuit between the adapter sheet 222 and the active material application portion 21, thereby reducing the risk of a short circuit in the battery core assembly 2, so as to improve the stability and reliability of the battery cell 10.

[0376] Furthermore, by using the adapter sheet 222 to achieve an indirect electrical connection between the second converging portion 2213 and the first electrode post 12, the adapter sheet 222 can be welded to the first electrode post 12 using the portion that avoids the second converging portion 2213, thereby firmly welding the adapter sheet 222 to the first electrode post 12, reducing the risk of weld cracks and further improving the reliability and stability of the battery cell 10. At the same time, by electrically connecting the first electrode post 12 and the tab sheet 2211 using the adapter sheet 222, the structure of the tab sheet 2211 can also be simplified.

[0377] FIG. 52 is a schematic cross-sectional view of a battery cell 10 according to some embodiments of the pr...

Claims

1. A casing assembly (1), a casing (11) having a mounting hole (113); a first pole (12) including an integrally molded pole body (12a), a first position limiting block (12b), and a second position limiting block (12c), wherein the pole body (12a) is drilled into the mounting hole (113), the first position limiting block (12b) and the second position limiting block (12c) are installed on both ends of the pole body (12a) along the axial direction (Z) of the mounting hole (113), and the first position limiting block (12b) is fitted to the outside of the casing (11) in a position-limiting manner, and the second position limiting block (12c) is fitted to the inside of the casing (11) in a position-limiting manner so that the first pole (12) is riveted to the casing (11); Casing assembly (1).

2. The cross section of the mounting hole (113) is defined as a projection plane (Ω), and the axial direction (Z) of the mounting hole (113) is defined as a projection direction. At least a portion of the circumferential profile (R1) of the projection of the first position limiting table (12b) on the projection plane (Ω) is a straight line, and / or at least a portion of the circumferential profile (R2) of the projection of the second position limiting table (12c) on the projection plane (Ω) is a straight line. A casing assembly (1) according to claim 1.

3. The cross section of the mounting hole (113) is defined as a projection plane (Ω), and the axial direction (Z) of the mounting hole (113) is defined as a projection direction. a circumferential profile (R1) of the projection of the first position limiting table (12b) on the projection plane (Ω) is formed by a combination of straight lines and arc lines, and / or a circumferential profile (R2) of the projection of the second position limiting table (12c) on the projection plane (Ω) is formed by a combination of straight lines and arc lines; A casing assembly (1) according to claim 1.

4. The cross section of the mounting hole (113) is defined as a projection plane (Ω), and the axial direction (Z) of the mounting hole (113) is defined as a projection direction. the circumferential profile (R1) of the projection of the first position limiting table (12b) on the projection plane (Ω) includes two straight lines and two arc lines, the two straight lines are arranged opposite to each other with a gap between them, and the opposite ends of the two straight lines are connected by an arc line, and / or the circumferential profile (R2) of the projection of the second position limiting table (12c) on the projection plane (Ω) includes two straight lines and two arc lines, the two straight lines are arranged opposite to each other with a gap between them, and the opposite ends of the two straight lines are connected by an arc line, A casing assembly (1) according to claim 3.

5. The cross section of the mounting hole (113) is defined as a projection plane (Ω), and the axial direction (Z) of the mounting hole (113) is defined as a projection direction. a dimension (L1) in a first direction of the projection of the first position limiting table (12b) on the projection plane (Ω) is greater than a dimension (L2) in a second direction of the projection of the first position limiting table (12b) on the projection plane (Ω), and / or a dimension (L3) in a first direction of the projection of the second position limiting table (12c) on the projection plane (Ω) is greater than a dimension (L4) in a second direction of the projection of the second position limiting table (12c) on the projection plane (Ω); wherein the first direction (X), the second direction (Y), and the axial direction (Z) are perpendicular to each other; A casing assembly (1) according to claim 1.

6. a dimension (L1) in a first direction of the projection of the first position limiting table (12b) on the projection plane (Ω) is greater than three times a dimension (L2) in a second direction of the first position limiting table (12b), and / or a dimension (L3) in a first direction of the projection of the second position limiting table (12c) on the projection plane (Ω) is greater than three times a dimension (L4) in a second direction of the second position limiting table (12c); A casing assembly (1) according to claim 5.

7. The casing (11) has a first wall (110), the mounting hole (113) is formed in the first wall (110), the first direction is the length direction of the first wall (110), and the second direction is the width direction of the first wall (110). A casing assembly (1) according to claim 5.

8. The length dimension (L5) of the pole body (12a) in the first direction is equal to or greater than 1 / 3 of the length dimension (a0) of the first wall (110) in the first direction, and / or The width dimension (L6) of the pole body (12a) in the second direction is equal to or greater than 1 / 4 of the width dimension (b0) of the first wall (110) in the second direction, and / or The cross-sectional area of ​​the portion where the pole body (12a) and the mounting hole (113) fit together is 4% or more of the area of ​​the first wall (110), and / or a ratio of a thickness dimension (t) of the pole body (12a) to a thickness dimension (t0) of the first wall (110) along an axial direction (Z) of the mounting hole (113) is greater than 1 and less than 1.5; A casing assembly (1) according to claim 7.

9. The length dimension (L5) of the pole body (12a) in the first direction is equal to or greater than 1 / 3 of the length dimension (a0) of the first wall (110) in the first direction, and / or The width dimension (L6) of the pole body (12a) in the second direction is equal to or greater than half the width dimension (b0) of the first wall (110) in the second direction, and / or The circumferential length of the pole body (12a) and the mounting hole (113) in the circumferential direction where they fit together is 25% or more of the circumferential length of the first wall (110), and / or The cross-sectional area of ​​the portion where the pole body (12a) and the mounting hole (113) fit together is 10% or more of the area of ​​the first wall (110), and / or a ratio of a thickness dimension (t) of the pole body (12a) to a thickness dimension (t0) of the first wall (110) along an axial direction (Z) of the mounting hole (113) is greater than 1 and less than 1.5; A casing assembly (1) according to claim 7.

10. The length dimension (L1) of the first position limiting table (12b) in the first direction is equal to or greater than 1 / 3 of the length dimension (a0) of the first wall (110) in the first direction, and / or The width dimension (L2) of the first position limiting table (12b) in the second direction is equal to or greater than 1 / 4 of the width dimension (b0) of the first wall (110) in the second direction, and / or The cross-sectional area of ​​the first position limiting platform (12b) is 4.5% or more of the area of ​​the first wall (110), and / or Along the axial direction of the mounting hole (113), the thickness dimension (t1) of the first position limiting base (12b) is 0.6 or more times the thickness dimension (t0) of the first wall (110) and 1.5 or less times the thickness dimension (t0) of the first wall (110). A casing assembly (1) according to claim 7.

11. The length dimension (L1) of the first position limiting table (12b) in the first direction is equal to or greater than 1 / 3 of the length dimension (a0) of the first wall (110) in the first direction, and / or The width dimension (L2) of the first position limiting table (12b) in the second direction is equal to or greater than half the width dimension (b0) of the first wall (110) in the second direction, and / or The first position limiting base (12b) is columnar, and the circumferential dimension of the outer periphery of the first position limiting base (12b) is 30% or more of the circumferential dimension of the first wall (110), and / or The cross-sectional area of ​​the first position limiting platform (12b) is 9% or more of the area of ​​the first wall (110), and / or Along the axial direction of the mounting hole (113), the thickness dimension (t1) of the first position limiting base (12b) is 0.6 or more times the thickness dimension (t0) of the first wall (110) and 1.5 or less times the thickness dimension (t0) of the first wall (110). A casing assembly (1) according to claim 7.

12. The length dimension (L3) of the second position limiting table (12c) in the first direction is equal to or greater than 1 / 3 of the length dimension (a0) of the first wall (110) in the first direction, and / or The width dimension (L4) of the second position limiting table (12c) in the second direction is equal to or greater than 1 / 4 of the width dimension (b0) of the first wall (110) in the second direction, and / or The cross-sectional area of ​​the second position limiting platform (12c) is 4.5% or more of the area of ​​the first wall (110), and / or Along the axial direction of the mounting hole (113), the thickness dimension (t2) of the second position limiting base (12c) is 0.6 or more times the thickness dimension (t0) of the first wall (110) and 1.5 or less times the thickness dimension (t0) of the first wall (110). A casing assembly (1) according to claim 7.

13. The length dimension (L3) of the second position limiting table (12c) in the first direction is equal to or greater than 1 / 3 of the length dimension (a0) of the first wall (110) in the first direction, and / or The width dimension (L4) of the second position limiting table (12c) in the second direction is equal to or greater than half the width dimension (b0) of the first wall (110) in the second direction, and / or The second position limiting base (12c) is columnar, and the circumferential dimension of the outer periphery of the second position limiting base (12c) is 30% or more of the circumferential dimension of the first wall (110), and / or The cross-sectional area of ​​the second position limiting platform (12c) is 9% or more of the area of ​​the first wall (110), and / or Along the axial direction of the mounting hole (113), the thickness dimension (t2) of the second position limiting base (12c) is 0.6 or more times the thickness dimension (t0) of the first wall (110) and 1.5 or less times the thickness dimension (t0) of the first wall (110). A casing assembly (1) according to claim 7.

14. The casing (11) has a first wall (110), and two mounting holes (113) are formed in the first wall (110), and two first pole posts (12) of opposite polarity are installed in the two mounting holes (113), respectively; or The casing (11) has a first wall (110), and four mounting holes (113) are formed in the first wall (110), and four first poles (12) having two of the same polarity are installed in each of the four mounting holes (113); or The casing (11) has a first wall (110) and a second wall (11b), the second wall (11b) is disposed at an angle to the first wall (110) or oppositely spaced apart, the first wall (110) and the second wall (11b) are formed with the mounting holes (113), one first pole (12) is disposed in the mounting hole (113) of the first wall (110) and the mounting hole (113) of the second wall (11b), and the polarities of the two first poles (12) are opposite to each other; or The casing (11) has a first wall (110), two mounting holes (113) are formed in the first wall (110), and two first poles (12) of the same polarity are installed in each of the two mounting holes (113). The casing (11) has a second wall (11b) that is angled with the first wall (110) or installed opposite to the first wall (110) with a gap therebetween, two mounting holes (113) are formed in the second wall (11b), and one first pole (12) is installed in each of the two mounting holes (113) in the second wall (11b), and the polarity of the two first poles (12) in the second wall (11b) is the same and opposite to the polarity of the first poles (12) in the first wall (110). A casing assembly (1) according to any one of claims 1 to 13.

15. The power supply further includes an insulating seal member (8) provided between the first pole (12) and the casing (11). A casing assembly (1) according to any one of the preceding claims.

16. The insulating seal member (8) is an insulating member (81) provided between the first position limiting base (12b) and the casing (11); and a first seal member (82) provided between the second position limiting base (12c) and the casing (11), and a part of the insulating member (81) and / or a part of the first seal member (82) is fitted between the pole body (12a) and a peripheral wall of the mounting hole (113). A casing assembly (1) according to claim 15.

17. 17. The casing assembly (1) according to claim 16, wherein a first fitting groove (11c) is formed in the outer wall of the casing (11), and the first fitting groove (11c) is used to accommodate the insulating member (81).

18. The casing assembly (1) according to claim 16, wherein an engaging protrusion (11d) is formed on an inner wall of the casing (11), and the engaging protrusion (11d) abuts against and engages with the first seal member (82).

19. A battery cell (10) comprising a battery core assembly (2) and a casing assembly (1) according to any one of claims 1 to 18, wherein the battery core assembly (2) is disposed within the casing (11) and is electrically connected to the first pole (12). Battery cell (10).

20. The battery core assembly (2) includes an active material application portion (21) and a conductive portion (22), the active material application portion (21) is housed in the casing (11), and the conductive portion (22) is used to electrically connect the active material application portion (21) to the first pole (12); A receiving portion (121) is provided on the first pole (12), and at least a portion of the conductive portion (22) is received in the receiving portion (121).

20. The battery cell (10) of claim 19.

21. The accommodating portion (121) has a first accommodating groove (12110), the surface of the first pole (12) facing the active material coated portion (21) is the pole inner end face (122), the groove opening of the first accommodating groove (12110) is formed in the pole inner end face (122), and at least a part of the conductive portion (22) is accommodated in the first accommodating groove (12110). The battery cell (10) of claim 20.

22. A first recessed groove (12112) is formed in the groove wall of the first accommodating groove (12110), and at least a part of the electrical connection position between the conductive portion (22) and the first pole post (12) is located within the first recessed groove (12112).

22. The battery cell (10) of claim 21.

23. The first electrode post (12) has a first recessed groove (126), and the surface of the first electrode post (12) away from the active material coated portion (21) is an outer end face (123) of the electrode post, and the groove opening of the first recessed groove (126) is formed in the outer end face (123) of the electrode post.

23. A battery cell (10) according to claim 21 or 22.

24. The battery cell (10) further includes a groove cover (7) attached to the first pole (12) and sealingly capping the opening of the first groove (126).

24. The battery cell (10) of claim 23.

25. The accommodating portion (121) has a second accommodating groove (12120), the surface of the first pole (12) away from the active material coated portion (21) is the pole outer end face (123), the groove opening of the second accommodating groove (12120) is formed in the pole outer end face (123), the second accommodating groove (12120) communicates with the inside of the casing (11) via a first through hole (12130), the conductive portion (22) is drilled in the first through hole (12130), and at least a portion of the conductive portion (22) is accommodated in the second accommodating groove (12120). The battery cell (10) of claim 20.

26. The second accommodating groove has a second recessed groove (12122), and at least a part of the electrical connection position between the conductive portion (22) and the first pole (12) is located within the second recessed groove (12122).

26. The battery cell (10) of claim 25.

27. The casing assembly (1) further includes a first cover plate (13) fitted to the first pole (12) and sealing the opening of the second receiving groove (12120), and the first cover plate (13) is electrically connected to the first pole (12).

27. A battery cell (10) according to claim 25 or 26.

28. The casing assembly (1) further includes a second cover plate (14) that covers the outside of the conductive portion (22) located in the first through hole (12130) and the second accommodating groove (12120). The battery cell (10) according to any one of claims 25 to 27.

29. The battery further includes a support (3) located within the casing (11) and on a side of the active material coated portion (21) that is close to the first pole (12), the support (3) having an escape hole (31) for avoiding the conductive portion (22), and the conductive portion (22) is adapted to extend through the escape hole (31) to a side of the support (3) that is away from the active material coated portion (21). The battery cell (10) according to any one of claims 20 to 28.

30. The support (3) is provided with a guide portion (32) that surrounds and forms at least a part of the relief hole (31), and at least a part of the guide portion (32) extends into the storage portion (121).

30. The battery cell (10) of claim 29.

31. The relief hole (31) includes a first hole section (311) and a second hole section (312), the second hole section (312) is located on the side of the first hole section (311) that is close to the active material application section (21), and the cross-sectional area of ​​the second hole section (312) gradually increases in a direction away from the first hole section (311), the active material application section (21) includes a current collector (211) and an active material layer (212) provided on the current collector (211), the conductive section (22) includes a tab section (221) electrically connected to the current collector (211), and the tab section (221) is made up of a plurality of tab sheets ( a plurality of tab sheets (2211) gathering at a position close to the current collector (211) to form a first converging portion (2212), a plurality of tab sheets (2211) gathering at a position away from the current collector (211) to connect to form a second converging portion (2213), the first converging portion (2212) connecting the second converging portion (2213) and the active material coating portion (21), at least a portion of the first converging portion (2212) being accommodated in the second perforation step (312), and the second converging portion (2213) being drilled in the first perforation step (311); 31. A battery cell (10) according to claim 29 or 30.

32. The support (3) is of a unitary structure, or the support (3) comprises a first support (33) and a second support (34) which are separate and removable structures, and the relief hole (31) is defined between the first support (33) and the second support (34). A battery cell (10) according to any one of claims 29 to 31.

33. The battery further includes an inner insulating member (4) located within the casing (11), surrounding the outside of the active material application portion (21), and connected to a support (3). A battery cell (10) according to any one of claims 29 to 32.

34. The casing assembly (1) includes a plurality of poles, at least one of which is the first pole (12). A battery cell (10) according to any one of claims 19 to 33.

35. The casing (11) has a pressure release part (16), and the pressure release part (16) and the first pole (12) are located on the same surface of the casing (11), or the pressure release part (16) and the pole are respectively located on two surfaces on different sides of the casing (11).

35. The battery cell (10) of claim 34.

36. The casing (11) has a pressure release section (16), the casing (11) includes a casing body (111) and a casing cover (112), one end of the casing body (111) is open, the casing cover (112) is provided at the open end of the casing body (111), and the pressure release section (16) is provided at the casing cover (112). A battery cell (10) according to any one of claims 19 to 35.

37. A battery cell (10) according to any one of claims 19 to 36, Battery (100).

38. 38. The battery (100) of claim 37, Electrical device (1000).

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