Battery cell, battery device, and electric device

Abstract

A battery cell, a battery device, and an electric device, relating to the technical field of batteries. The battery cell comprises a casing, an electrode component, and a pole component. The electrode component is arranged in the casing. The casing comprises a first casing wall. The pole component is arranged on the first casing wall and comprises a pole and a clamping structure; the pole is connected to the electrode component, and the clamping structure is connected to the first casing structure; the clamping structure surrounds the pole and is insulated from and in sealing fit with the pole by means of an insulating sealing structure; the clamping structure comprises a first clamping member and a second clamping member connected to each other; the first clamping member is bent toward the pole, and forms, together with the second clamping member, a clamping slot for clamping the pole; the first clamping member comprises first clamping portions bent toward the pole; the number of first clamping portions is greater than one and the first clamping portions are arranged circumferentially along the pole; and a gap is formed between at least two adjacent first clamping portions.

Description

Battery cells, battery packs and electrical devices Technical Field

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

[0002] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, the power battery, as the power source, plays an irreplaceable and crucial role. The power battery comprises several individual battery cells; however, the reliability of these individual cells needs improvement.

[0003] Application content

[0004] This application provides a battery cell, a battery device, and an electrical device, which helps to improve the reliability of the battery cell.

[0005] In a first aspect, embodiments of this application provide a battery cell, including a housing, an electrode component, and a terminal component. The electrode component is disposed within the housing, and the housing includes a first housing wall. The terminal component is disposed on the first housing wall and includes a terminal and a clamping structure. The terminal is connected to the electrode component, and the clamping structure is connected to the first housing wall. The clamping structure surrounds the terminal and is insulated from and sealed to the terminal through an insulating and sealing structure. The clamping structure includes a first clamping member and a second clamping member connected together. The first clamping member is bent toward the terminal and forms a clamping groove with the second clamping member to clamp the terminal. The first clamping member includes a first clamping portion bent toward the terminal. There are multiple first clamping portions arranged circumferentially along the terminal, and at least two adjacent first clamping portions form an interruption.

[0006] In the above technical solution, since an interruption is formed between at least two adjacent first clamping parts, it means that during the bending process, the at least two adjacent first clamping parts can extend into the pre-formed groove used to transform into an interruption. This allows the two first clamping parts to avoid stacking and wrinkling after bending, instead jointly defining the interruption, thereby improving the redundancy problems such as material accumulation and wrinkles that exist after bending the first clamping part. Because the redundancy problems such as material accumulation and wrinkles caused by bending of the clamping structure are improved, the reliability of the electrode being clamped by the clamping structure is enhanced, increasing the electrode's resistance to internal and external pressure, thus improving the reliability of the battery cell. Furthermore, it makes it less likely for gaps to appear at the electrical connection points between the electrode and the electrode components and / or the busbar components, thereby improving the problems of increased contact resistance, temperature rise, and reduced conductive area caused by gaps. This further improves the operational reliability of the battery cell and helps ensure power supply efficiency and power supply requirements. Furthermore, when the first clamping member is located outside the housing and needs to be covered with insulating material, the redundant problems such as material accumulation and wrinkles caused by bending of the first clamping member are improved. This can improve the comprehensiveness of the first clamping member being covered by insulating material, thereby reducing the probability of short circuit connection between the housing and the busbar component, and thus improving the reliability of the battery cell.

[0007] In some embodiments, a plurality of first clamping portions are arranged at intervals along the circumference of the pole post, such that an interruption is formed between each pair of adjacent first clamping portions, and the interruption is a plurality of portions arranged at intervals along the circumference of the pole post.

[0008] In the above technical solution, by setting multiple interruptions and spacing them along the direction of the clamping structure around the pole, more space is reserved to allow the bent first clamping part to stretch out, thereby better solving the redundant problems such as material accumulation and wrinkles caused by the bending of the clamping structure.

[0009] In some embodiments, the pole post is a circular structure, and multiple discontinuities are evenly spaced along the circumference of the pole post.

[0010] In the above technical solution, because multiple discontinuities are evenly spaced along the circumference of the pole post, multiple first clamping parts can also be evenly spaced along the circumference of the pole post. This ensures that the multiple first clamping parts are subjected to uniform force, thereby more reliably clamping the pole post and improving the reliability of the pole post clamping. Furthermore, the multiple first clamping parts also ensure that the seal between the clamping structure and the pole post is uniformly compressed, thus helping to guarantee the sealing performance between the clamping structure and the pole post.

[0011] In some embodiments, the pole post is a long strip structure, with first clamping portions distributed at both ends of the pole post's length and on both sides of its width.

[0012] In the above technical solution, both ends of the elongated pole in the length direction and both sides in the width direction can be clamped by the first clamping parts, so that the multiple first clamping parts can clamp the pole more stably and improve the reliability of the pole being clamped. Moreover, the multiple first clamping parts can also make the seal between the clamping structure and the pole more uniformly compressed, thereby helping to ensure the sealing between the clamping structure and the pole.

[0013] In some embodiments, the pole post is a racetrack-shaped structure, which consists of a rectangle and two arcs located at both ends of the rectangle's length, with the discontinuity corresponding to the connection position of the rectangle and the arcs.

[0014] In the above technical solution, for the racetrack-shaped pole, when the first clamping member of the transition structure surrounding it is bent, the rectangular and arc-shaped connection positions of the pole are prone to redundant problems such as material accumulation and wrinkles. Setting the discontinuity at this position can more directly improve the redundant problems such as material accumulation and wrinkles of the first clamping member, and also enable the first clamping part to be distributed at both ends of the pole's length and both sides of its width, thereby improving the clamping reliability of the pole.

[0015] In some embodiments, the end of the interruption near the connection between the first clamp and the second clamp is a closed end, and the end of the interruption that passes through the first clamp and is away from the connection is an open end. The width of the interruption at the open end is greater than the width of the interruption at the closed end.

[0016] In the above technical solution, since the first clamping member bends towards the pole post, the circumference of the first clamping member is shorter the further away from the connection position between the first clamping member and the second clamping member. The shorter the circumference, the more likely it is to cause redundant problems such as material accumulation and wrinkles. Setting the discontinuity to have a relatively large width at the opening end indicates that more width space is reserved in the inner circle with a shorter circumference to absorb the extension of the first clamping part, thereby more reliably improving the redundant problems such as material accumulation and wrinkles caused by the bending of the first clamping member.

[0017] In some embodiments, the width of the interruption gradually increases along the direction from the closed end to the open end.

[0018] In the above technical solution, since the first clamping member bends toward the pole post, the circumference of the first clamping member gradually shortens along the direction away from the connection position between the first clamping member and the second clamping member. The discontinuity is set to have a width that gradually increases along the direction from the closed end to the open end, so as to match the trend of the circumference of the first clamping member shortening, so as to more effectively absorb the extension of the first clamping part, thereby more reliably improving the redundant problems such as material accumulation and wrinkles caused by the bending of the first clamping member.

[0019] In some embodiments, the first clamping member includes a surrounding portion connected between the first clamping portion and the second clamping member. The surrounding portion extends in the inward and outward directions of the first shell wall and extends around the entire circumference of the pole post. The first clamping portion and the surrounding portion are integral, and the surrounding portion bends and extends relative to the surrounding portion toward the central axis of the pole post. The interruption extends from the connection between the surrounding portion and the first clamping portion toward the direction away from the surrounding portion to penetrate the first clamping member.

[0020] In the above technical solution, the first clamping member includes a non-bending surrounding portion, and the non-bending surrounding portion does not have any discontinuities, which helps to improve the overall structural strength of the clamping structure and improve the clamping reliability of the clamping structure for the pole.

[0021] In some embodiments, the first clamping portion has reinforcing ribs that protrude toward the direction away from the pole post.

[0022] In the above technical solution, by providing reinforcing ribs on the first clamping part, the deformation problem of the first clamping part can be improved, the clamping reliability of the pole post can be enhanced, and the pressing reliability of the sealing element between the clamping structure and the pole post can be improved, thereby helping to ensure the sealing performance between the clamping structure and the pole post.

[0023] In some embodiments, along the direction of the first clamping member surrounding the pole post, the reinforcing rib is located at the center of the first clamping portion, and the reinforcing rib extends along the bending trajectory of the first clamping portion.

[0024] In the above technical solution, by setting the reinforcing rib at the center of the first clamping part and by setting the reinforcing rib to extend along the bending trajectory of the first clamping part, the deformation problem of the first clamping part can be effectively improved with a relatively small number of reinforcing ribs, thereby helping to reduce material costs and product weight.

[0025] In some embodiments, the first clamping member and the second clamping member are integral parts.

[0026] In the above technical solution, by making the first clamping member and the second clamping member an integral piece, the assembly steps of the battery cell can be reduced, and the assembly efficiency of the battery cell can be improved. Furthermore, it is beneficial to simultaneously improve the connection reliability of the first and second clamping members, as well as the connection reliability between the clamping structure and the first shell wall. It also helps to simultaneously improve the sealing and insulation between the clamping structure and the terminal post.

[0027] In some embodiments, the second clamping member is a preformed part and connected to the first shell wall, and the first clamping member is a riveted part.

[0028] In the above technical solution, since the second clamping component is a pre-formed component, the bending process during the assembly of the second clamping component and the pole post is eliminated, reducing the assembly difficulty of the clamping structure and the pole post.

[0029] In some embodiments, the second clamping member includes a second clamping portion that cooperates with the first clamping portion to define a clamping groove, and the second clamping portion has a stepped structure that protrudes in a direction away from the first clamping portion.

[0030] In the above technical solution, since the second clamping part has a stepped structure protruding in a direction away from the first clamping part, the structural strength of the second clamping part can be strengthened, which is beneficial to improving the support strength of the second clamping part for the pole post. In this way, when the first clamping part is riveted, the second clamping part and the first clamping part can cooperate to reliably clamp the pole post and clamp the sealing element located between the clamping structure and the pole post, thereby improving the sealing performance of the clamping structure and the pole post mating position. It also improves the problem of decreased sealing performance caused by the deformation of the second clamping part due to the elastic force of the sealing element, further improving the sealing performance of the clamping structure and the pole post mating position.

[0031] In some embodiments, the clamping structure includes a transition body, which is integral with at least one of the first clamping member and the second clamping member, and the transition body is integral with the first shell wall.

[0032] In the above technical solution, the step of assembling the clamping structure with the first shell wall can be eliminated, thereby improving production efficiency.

[0033] In some embodiments, the clamping structure includes an adapter body, which is integral with at least one of the first clamping member and the second clamping member, and the adapter body is assembled and connected to the first shell wall.

[0034] In the above technical solution, the clamping structure and the first shell wall can be processed separately, which is conducive to the processing and manufacturing of battery cells and to meeting the sealing requirements. When the clamping structure is assembled with the first shell wall, the pressure on the first shell wall is reduced, thereby protecting the first shell wall.

[0035] In some embodiments, the first clamping member is disposed on the side of the second clamping member away from the electrode component; the insulating sealing structure includes a seal, at least a portion of which is clamped between the electrode post and the second clamping member.

[0036] In the above technical solution, the sealing element can be positioned closer to the electrolyte inside the housing, which helps to better prevent the electrolyte from seeping into the mating area between the electrode and the clamping structure, reducing the problem of electrolyte leakage to the outside of the housing through the mating area. Furthermore, when the electrode is a composite electrode, it can mitigate the corrosion problem caused by the electrolyte at the composite electrode location.

[0037] In some embodiments, the second clamping member includes a second clamping portion that cooperates with the first clamping portion to form a clamping groove. The second clamping portion includes an end portion and a root portion. The end portion is disposed away from the first housing wall relative to the root portion. At least a portion of the seal is clamped between the root portion and the pole post.

[0038] In the above technical solution, since the second clamping part is cantilevered, the end is more likely to deform than the root. At least part of the seal is clamped between the less deformable root of the second clamping part and the pole, which helps to improve the reliability of the seal being clamped, so that the sealing compression of the seal can be guaranteed and the sealing reliability can be improved.

[0039] In some embodiments, the seal is also clamped between the end and the pole.

[0040] In the above technical solution, the sealing area of ​​the seal is larger, which can get closer to the electrolyte inside the shell. This helps to better prevent the electrolyte from seeping into the mating position between the electrode post and the clamping structure, and reduces the problem of electrolyte leaking out of the shell through the mating position between the electrode post and the clamping structure.

[0041] In some embodiments, the seal is also clamped between the first clamp and the pole, such that at least a portion of the seal is located between the connection point of the first clamp and the second clamp and the pole.

[0042] In the above technical solution, the sealing area of ​​the seal is larger, which can reduce the risk of electrolyte seeping out of the housing along the mating position between the electrode and the clamping structure. Furthermore, when the electrode is a composite electrode, the seal can be positioned more easily close to the composite material surface of the electrode, thereby more effectively improving the problem of electrode corrosion.

[0043] In some embodiments, the seal is a single piece and also includes a portion clamped between the first clamping portion and the pole post.

[0044] In the above technical solution, the sealing area of ​​the seal is larger and the seal is easier to process, which can improve the sealing effect.

[0045] In some embodiments, one of the first clamping member and the second clamping member is a preformed member and the other is a riveted member, the preformed member being connected to the first shell wall; the insulating sealing structure includes: a seal, at least a portion of which is clamped between the pole post and the preformed member.

[0046] In the above technical solution, since the shape of the preformed part does not change much before and after riveting, at least part of the seal can be clamped between the pole and the preformed part, making it easier to control the compression of the seal and thus enabling the seal to achieve a more reliable sealing effect.

[0047] In some embodiments, the insulating sealing structure includes an insulating support, at least a portion of which is disposed on the side of the second clamping member away from the first clamping member.

[0048] In the above technical solution, by setting an insulating support, the battery cell can prevent short-circuit electrical connection between the clamping structure and the electrode components under operating environments such as vibration, thereby improving the reliability of the battery cell.

[0049] In some embodiments, the clamping structure is integral with the first shell wall, the insulating support is integral with the first shell wall and also includes a first extension extending to the inner side of the first shell wall.

[0050] In the above technical solution, the insulating bracket can also prevent short-circuit electrical connection between the first shell wall and the electrode components, thereby further improving the reliability of the battery cell. Moreover, it can eliminate the need to set other insulating material brackets between the first shell wall and the electrode components, thereby simplifying the structure of the battery cell, reducing costs, and improving assembly efficiency.

[0051] In some embodiments, the clamping structure and the first shell wall are separate components, the insulating support is an integral component, and it also includes a second extension extending between the second clamping member and the pole post.

[0052] In the above technical solution, the insulating bracket can also prevent short-circuit electrical connection between the second clamping member and the terminal post, thereby further improving the reliability of the battery cell, simplifying the structure, reducing parts, and lowering costs.

[0053] In some embodiments, the insulating sealing structure includes an insulating support, which is an integral piece and includes a portion disposed on the side of the second clamping member away from the first clamping member, and a second extension extending between the second clamping member and the pole post, the second extension being clamped between the end and the pole post, and having a gap between the second extension and the portion of the sealing member clamped between the root and the pole post.

[0054] In the above technical solution, the insulating bracket can also simultaneously prevent short-circuit electrical connections between the second clamping member and the terminal post, thereby further improving the reliability of the battery cell, simplifying the structure, reducing parts, and lowering costs. Furthermore, the second extension provides space for compression deformation of the seal, ensuring that the compression amount of the seal meets requirements.

[0055] In some embodiments, the first clamping member may be disposed on the side of the second clamping member away from the electrode component; the insulating sealing structure includes: an insulating member, the insulating member including an inner insulating portion, at least a portion of the inner insulating portion being clamped between the electrode post and the first clamping member.

[0056] In the above technical solution, by setting an inner insulating part, a relatively reliable insulating effect can be achieved between the pole and the first clamping member.

[0057] In some embodiments, the insulating sealing structure further includes a sealing element, at least a portion of which is clamped between the pole and the second clamping element, wherein the hardness of the insulating element is greater than the hardness of the sealing element.

[0058] In the above technical solution, when the first clamping member is bent, since the sealing member is clamped between the pole and the second clamping member, and the inner insulation part is clamped between the pole and the first clamping member, the bending position can be far away from the sealing member, thereby making it easier to control the compression of the sealing member and improve the sealing effect.

[0059] In some embodiments, the seal and the inner insulation are separate parts, and there is a gap between the seal and the inner insulation.

[0060] In the above technical solution, the inner insulation part is designed to provide space for compression deformation of the seal, so that the compression amount of the seal can meet the requirements. Moreover, since the seal and the insulation part are separate parts and not integrated, they can be flexibly set according to the actual situation when assembling the pole and the clamping structure, which reduces the assembly difficulty and improves the assembly efficiency.

[0061] In some embodiments, the inner insulation portion is injection molded onto the pole post.

[0062] In the above technical solution, the inner insulation part is not easily separated from the pole, which can improve the insulation effect and simplify the assembly steps. In addition, the inner insulation part, which is injection molded onto the pole, can also play a shaping and restraining role in the bending deformation of the first clamping part.

[0063] In some embodiments, the insulating member further includes an outer insulating portion, at least a portion of which is externally wrapped around the first clamping member.

[0064] In the above technical solution, the outer insulation part can be used to isolate the short-circuit electrical connection between the current collector and the clamping structure, thereby achieving the insulation effect between the current collector and the clamping structure and improving the reliability of the battery device.

[0065] In some embodiments, the inner insulating portion is connected to the outer insulating portion.

[0066] In the above technical solution, by connecting the inner insulation part and the outer insulation part, the risk of the outer insulation part detaching from the clamping structure can be reduced, and the reliability of the insulation between the outer insulation part and the clamping structure can be improved.

[0067] In some embodiments, the inner insulating portion and the outer insulating portion are connected by a break; and / or, the first clamping member has a through hole, through which the inner insulating portion is connected to the outer insulating portion.

[0068] In the above technical solution, while satisfying the connection between the inner insulation part and the outer insulation part, no new structural components are generated due to the connection, and no new parts protrude from the clamping structure. This simplifies the structural design and processing, reduces costs, and helps maintain the first clamping member with relatively stable structural strength, thereby improving clamping reliability and sealing reliability.

[0069] In some embodiments, the inner insulation portion and the outer insulation portion are integral parts, or the inner insulation portion and the outer insulation portion are separately formed and assembled.

[0070] In the above technical solution, the insulating components can be flexibly processed according to different needs.

[0071] In some embodiments, the first clamping member is disposed on the side of the second clamping member away from the electrode component; the insulating sealing structure includes an insulating member, the insulating member including an outer insulating portion, at least a portion of the outer insulating portion being externally wrapped around the first clamping member.

[0072] In the above technical solution, the outer insulation portion can be used to isolate the short-circuit electrical connection between the current collector and the clamping structure, thereby achieving an insulation effect between the current collector and the clamping structure and improving the reliability of the battery device. Furthermore, the outer insulation portion can also have a leveling effect, filling in any wrinkles or stacking areas of the first clamping member to achieve a more reliable insulation effect between the clamping structure and the current collector.

[0073] In some embodiments, the side surface of the outer insulation portion away from the electrode component is lower than or flush with the side surface of the pole away from the electrode component.

[0074] In the above technical solution, the outer insulating part wrapped around the first clamping member will not lift the current-carrying component connected to the pole, thereby improving the connection reliability and connection stability between the current-carrying component and the pole.

[0075] In some embodiments, the outer insulation portion includes an inset portion sandwiched between the outer peripheral surface of the pole post and the inner peripheral surface of the first clamping member.

[0076] In the above technical solution, the gripping force can be improved by setting the embedded part, the reliability and stability of the cooperation between the outer insulation part and the clamping structure can be improved, and the reliability of the insulation between the clamping structure and the busbar component can be improved.

[0077] In some embodiments, the outer insulation portion also fills the gap.

[0078] In the above technical solution, the outer insulation part can play a more effective filling effect, which can not only fill the wrinkles or stacked positions of the first clamping member, but also fill the missing pit positions of the first clamping member.

[0079] In some embodiments, the pole piece further includes a reinforcing piece disposed between the first clamping member and the portion of the insulating sealing structure sandwiched between the first clamping member and the pole piece, and bent into a shape that matches the first clamping member.

[0080] In the above technical solution, by setting a reinforcing plate, the reinforcing plate can play a role in structural reinforcement, improve the strength of the first clamping member, enable the clamping structure to clamp the pole more reliably, and improve the sealing and insulation between the clamping structure and the pole.

[0081] In some embodiments, the electrode post includes a first metal part and a second metal part made of different materials. The first metal part is located on the side of the second metal part away from the electrode component. The second metal part is connected to the electrode component. The outer periphery of the first metal part and the outer periphery of the second metal part adjacent to the first metal part are covered with a protective metal layer.

[0082] In the above technical solution, by setting a protective metal layer, it is beneficial to solve the problem of electrode corrosion caused by accidental seepage of electrolyte into the interface between the first metal part and the second metal part.

[0083] In some embodiments, the insulating sealing structure includes: an insulating support, at least a portion of which is disposed on the side of the clamping structure near the electrode component, the pole post including an inner protrusion located in the inner ring region of the insulating support, the inner protrusion protruding relative to the clamping structure toward the electrode component, and the side surface of the inner protrusion near the electrode component being flush with the side surface of the insulating support near the electrode component.

[0084] In the above technical solution, the pole post can be relatively close to the electrode component, which facilitates the connection operation between the electrode component and the pole post.

[0085] In some embodiments, the electrode post member defines a receiving groove recessed in a direction away from the electrode member, the electrode post defining a groove end wall on the side of the receiving groove away from the electrode member, the electrode member being electrically connected to the electrode post via a conductive portion, at least a portion of the conductive portion being received in the receiving groove and connected to the groove end wall.

[0086] In the above technical solution, since at least part of the conductive part is housed in the receiving groove defined by the electrode post component, the space occupied by the conductive part in the housing can be reduced, so that more space can be saved in the housing to accommodate electrode components, electrolyte or gas generation, etc., thereby improving the energy density or reliability of the battery cell.

[0087] In some embodiments, the battery cell further includes a pressure relief device located in the housing and on the same side or opposite side as the terminal post component.

[0088] In the above technical solution, by setting a pressure relief device, when the pressure inside the casing exceeds a preset value, the pressure can be directionally released through the pressure relief device, thereby improving the reliability of the battery cell.

[0089] Secondly, embodiments of this application also provide a battery device, including a battery cell of any of the above-described solutions.

[0090] In the above technical solution, the reliability of the battery cell according to the embodiment of this application is improved, which is beneficial to improving the performance of the battery device.

[0091] In some embodiments, the battery device includes a housing, multiple battery cells housed within the housing, a bottom plate at the bottom of the housing, and terminal posts located on either the side of the housing near the bottom plate or the side of the housing away from the bottom plate.

[0092] In the above technical solution, the relative position of the terminal post component and the bottom plate of the casing is not limited, allowing for flexible arrangement of the battery cell and casing orientation. Specifically, when the terminal post component of the battery cell is located on the side of the casing facing the bottom plate, the battery cell is inverted, and the depressurized products are ejected in the direction away from the passenger compartment, which is safer. When the terminal post component of the battery cell is located on the side of the casing away from the bottom plate, the battery cell is upright, and electrolyte leakage is less likely.

[0093] Thirdly, embodiments of this application also provide an electrical device, including a battery device according to any of the above-described solutions.

[0094] In the above technical solution, the improved performance of the battery device is beneficial to improving the power consumption performance of the electrical device. Attached Figure Description

[0095] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0096] Figure 1 is a structural schematic diagram of a vehicle provided in some embodiments of this application;

[0097] Figure 2 is an exploded view of a battery device provided in some embodiments of this application;

[0098] Figure 3 is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0099] Figure 4 is a partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0100] Figure 5 is a cross-sectional view of the pole post component provided in some embodiments of this application;

[0101] Figure 6 is a partial enlarged view of part A shown in Figure 5;

[0102] Figure 7 is a perspective view of the pole post component provided in some embodiments of this application;

[0103] Figure 8 is a schematic diagram of the clamping structure shown in Figure 7;

[0104] Figure 9 is a schematic diagram of the clamping structure provided in some embodiments of this application before assembly;

[0105] Figure 10 is a frontal projection view of the clamping structure shown in Figure 9;

[0106] Figure 11 is a schematic diagram of the pole body provided in some embodiments of this application;

[0107] Figure 12 is an exploded view of the pole body shown in Figure 11 participating in the assembly of pole components;

[0108] Figure 13 is a schematic diagram of the completed assembly state of the pole post component shown in Figure 12;

[0109] Figure 14 is a partial enlarged view of part B shown in Figure 13;

[0110] Figure 15 is a frontal projection view of the pole post component provided in some embodiments of this application;

[0111] Figure 16 is a perspective view of the pole post component provided in some embodiments of this application;

[0112] Figure 17 is a schematic diagram of the clamping structure shown in Figure 16;

[0113] Figure 18 is a partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0114] Figure 19 is a partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0115] Figure 20 is an intermediate assembly state diagram of a battery cell provided in some embodiments of this application;

[0116] Figure 21 is a partial cross-sectional view of the battery cell shown in Figure 20 after assembly;

[0117] Figure 22 is a partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0118] Figure 23 is a partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0119] Figure 24 is a partial enlarged view of part C shown in Figure 23;

[0120] Figure 25 is a partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0121] Figure 26 is a cross-sectional view of the pole post component provided in some embodiments of this application;

[0122] Figure 27 is a cross-sectional view of the pole post component provided in some embodiments of this application;

[0123] Figure 28 is an orthographic projection view of the pole post component provided in some embodiments of this application, viewed from the outside;

[0124] Figure 29 is a partial cross-sectional view of a pole post component provided in some embodiments of this application;

[0125] Figure 30 is a schematic diagram of the mating of the pole post component and the press-fitting fixture provided in some embodiments of this application;

[0126] Figure 31 is a schematic diagram of the tab provided in some embodiments of this application.

[0127] Figure label:

[0128] 1000 vehicles;

[0129] Battery device 100; controller 200; motor 300;

[0130] Box body 101; First box section 1011; Second box section 1012; Box bottom plate 1013;

[0131] Battery cell 102; First direction F1; Second direction F2; Third direction F3;

[0132] 1. Housing; 111. First housing wall; 112. Mounting hole; 13. Receiving cavity;

[0133] pole piece 2;

[0134] pole post 21; first metal part 211; second metal part 212;

[0135] 213 protective metal layer; 214 inner protrusion; 215 groove end wall;

[0136] Clamping structure 22;

[0137] First clamping member 221; First clamping part 2211; Reinforcing rib 22111;

[0138] 2212; Interruption 2213; Closed end a1; Open end a2;

[0139] Precast groove 2214; Through hole 2215;

[0140] Second clamping element 222;

[0141] Second clamping part 2221; End part 22211; Root part 22212;

[0142] Adapter body 2222; clamping slot 223;

[0143] Insulating and sealing structure 23;

[0144] Seal 231; First sealing part 2311; Second sealing part 2312; Third sealing part 2313;

[0145] Insulating bracket 232; First extension 2324; Second extension 2325;

[0146] Insulating component 233; Inner insulating part 2331; Outer insulating part 2332; Embedded part 23321;

[0147] Reinforcing sheet 24; Receiving groove 25;

[0148] Electrode component 3; Active material coating part 32; Tab part 33;

[0149] 4. Conductive part; 41. Conductive component; 5. Pressure relief device; 6. Press-fit fixture;

[0150] The central axis of the pole; the ultrasonic weld mark; the laser weld seam;

[0151] The inner convex part near the electrode component, surface S1;

[0152] The surface S2 of the insulating support near the electrode component. Detailed Implementation

[0153] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0154] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0155] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0156] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to direct connection or indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0157] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0158] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0159] In this application, "multiple" means two or more, including two.

[0160] In this application, the battery cell may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, magnesium-ion batteries, or solid-state batteries, etc., and the embodiments of this application are not limited thereto. The battery cell may be cylindrical, cuboid, or other shapes, etc., and the embodiments of this application are not limited thereto.

[0161] The battery device mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. Exemplarily, the battery device may include a housing for encapsulating one or more battery cells, or one or more battery modules, the housing preventing liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0162] A single battery cell includes a casing, electrode components, and an electrolyte (which may be a solid electrolyte layer located between the positive and negative electrodes in a solid-state battery). The electrode components include at least one electrode assembly, and both the electrode assembly and the electrolyte are housed within the casing. The electrode assembly includes a positive electrode, a negative electrode, and a separator (this structure can be omitted in solid-state batteries). The battery cell primarily functions by the movement of metal ions between the positive and negative electrodes.

[0163] The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector, and the positive current collector without the positive active material layer protrudes from the positive current collector with the positive active material layer. The positive current collector without the positive active material layer serves as the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc.

[0164] The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector, and the negative current collector without the negative active material layer protrudes from the negative current collector with the negative active material layer. The negative current collector without the negative active material layer serves as the negative electrode tab. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc.

[0165] The separator can be made of PP, polypropylene, PE, polyethylene, etc. The electrode assembly mentioned in the embodiments of this application has a wound or stacked structure.

[0166] In related technologies, battery cells have terminals on their casings. These terminals are electrically connected to electrode components inside the casing and to a busbar outside the casing. This allows the busbar to connect multiple battery cells within the battery assembly, fulfilling the electrical connection requirements between multiple cells. To secure the terminals, a ring-shaped clamping structure can be provided on the casing to hold them. This ring-shaped clamping structure exposes a portion of the terminal's inner surface to meet the electrical connection requirements between the terminal and the electrode components inside the casing, and also exposes a portion of the terminal's outer surface to meet the electrical connection requirements between the terminal and the busbar outside the casing.

[0167] The clamping structure can clamp and fix the pole post by riveting. However, since the circumference of the riveted flange formed after the clamping structure is bent by riveting is smaller than the circumference of the flange before riveting, the formed riveted flange has redundant problems such as material accumulation and wrinkles.

[0168] On the one hand, due to redundancy issues such as material accumulation and wrinkles in the riveted flanges of the clamping structure, some parts of the terminal post cannot be reliably clamped by the riveted flanges, thus affecting the reliability of the terminal post's fixation. Once the reliability of the terminal post's fixation is compromised, gaps will appear at the electrical connection points between the terminal post and the electrode components and / or the busbar components. This will lead to increased contact resistance, causing additional heat to be generated when current flows through, resulting not only in energy loss but also potentially in localized temperature increases, affecting the normal operating efficiency of the battery cell. Furthermore, prolonged exposure to poor contact will exacerbate the heating phenomenon in the battery cell, impacting its reliability. In addition, gaps at the electrical connection points between the terminal post and the electrode components and / or the busbar components will reduce the conductive area, lowering conductivity and limiting current flow. For high-current loads, this may not be sufficient to meet normal power supply requirements.

[0169] On the other hand, to prevent the casing from short-circuiting with the busbar via the clamping structure, insulating adhesive can be wrapped around the outside of the clamping structure. However, due to redundancy issues such as material accumulation and wrinkles in the riveted flanges of the clamping structure, the protruding areas may not be completely covered by the insulating adhesive, resulting in exposed parts of the clamping structure that could become conductive in contact with the busbar. Since the busbar typically carries a large current, it is prone to short-circuiting upon contact with the casing. A short circuit instantly generates a large amount of heat, causing the temperature and pressure inside the battery cell to rise rapidly, thus affecting the reliability of the battery cell.

[0170] In view of this, this application proposes a battery cell, which includes a housing, an electrode component, and a terminal component. The electrode component is disposed inside the housing, and the housing includes a first housing wall. The terminal component is disposed on the first housing wall. The terminal component includes a terminal and a clamping structure. The terminal is connected to the electrode component, and the clamping structure is connected to the first housing wall. The clamping structure surrounds the terminal and is insulated from and sealed to the terminal through an insulating and sealing structure. The clamping structure includes a first clamping member and a second clamping member connected together. The first clamping member is bent toward the terminal and forms a clamping groove with the second clamping member to clamp the terminal. The first clamping member includes a first clamping portion bent toward the terminal. There are multiple first clamping portions arranged circumferentially along the terminal, and at least two adjacent first clamping portions form an interruption, that is, two adjacent first clamping portions are disconnected and not connected at the interruption.

[0171] This intermittent design helps mitigate the redundancy issues such as material buildup and wrinkles that arise after the clamping structure is bent. This improves the reliability of the terminal post by addressing the problem of unreliable clamping in certain areas due to localized stacking and wrinkling of the clamping structure. Furthermore, by addressing the redundancy issues of material buildup and wrinkles after bending, when the bent portion of the clamping structure is on the outside of the casing and requires insulation, it ensures complete coverage of the bent portion. This improves the insulation between the current collector and the clamping structure, reducing the probability of a short circuit between the current collector and the casing, and thus enhancing the reliability of the individual battery cells.

[0172] The technical solutions described in the embodiments of this application are applicable to battery cells, battery devices containing battery cells, and electrical devices using battery devices.

[0173] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical devices.

[0174] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0175] Please refer to Figure 1, which is a structural schematic diagram of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 is equipped with a battery device 100, which can be located at the bottom, head, or tail of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000.

[0176] The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, for the power needs of the vehicle 1000 during startup, navigation and driving.

[0177] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0178] Please refer to Figure 2, which is an exploded view of a battery device 100 provided in some embodiments of this application. The battery device 100 includes a battery cell 102 and a housing 101 for housing the battery cell 102. The housing 101 can have various structural forms.

[0179] In some embodiments, the housing 101 may include a first housing portion 1011 and a second housing portion 1012, which overlap each other, and together define a receiving space for accommodating the battery cell 102. A sealing element may also be provided at the connection point between the first housing portion 1011 and the second housing portion 1012 to achieve a sealed connection between them.

[0180] For example, referring to Figure 2, both the first box section 1011 and the second box section 1012 can be hollow structures with an opening on one side. The opening side of the first box section 1011 covers the opening side of the second box section 1012, thus forming a box 101 with a accommodating space. Alternatively, the second box section 1012 can be a hollow structure with an opening on one side, and the first box section 1011 can be a lid that covers the opening side of the second box section 1012. The box 101 can have various shapes, such as a cylindrical box or a cuboid box.

[0181] In the battery device 100, there can be one or more battery cells 102. If there are multiple battery cells 102, they can be connected in series, in parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 102 are connected in both series and parallel configurations. Multiple battery cells 102 can be directly connected in series, in parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 102 is housed in the housing 101. Alternatively, multiple battery cells 102 can first be connected in series, in parallel, or in a mixed configuration to form a battery module, and then multiple battery modules can be connected in series, in parallel, or in a mixed configuration to form an entire assembly, which is then housed in the housing 101. In some embodiments, multiple battery cells 102 can be electrically connected through a busbar component to achieve parallel, series, or mixed configurations of the multiple battery cells 102.

[0182] Please refer to Figure 3, which is a schematic diagram of the structure of a battery cell 102 provided in some embodiments of this application. The battery cell 102 is in the form of a cuboid. The height direction of the battery cell 102 is a first direction F1, the thickness direction of the battery cell 102 is a second direction F2, and the width direction of the battery cell 102 is a third direction F3. The first direction F1, the second direction F2, and the third direction F3 are all perpendicular to each other. However, this is not a limitation; the battery cell 102 in the embodiments of this application may also be cylindrical or other shapes, and the battery cell 102 may be a hard-shell battery or a soft-pack battery, etc.

[0183] Please refer to Figures 3 and 4. Figure 4 is a partial cross-sectional view of a battery cell 102 provided in some embodiments of this application. In some embodiments of this application, the battery cell 102 includes a housing 1, an electrode component 3, and a terminal component 2. The electrode component 3 is disposed within the housing 1. The housing 1 includes a first housing wall 111, and the terminal component 2 is disposed within the first housing wall 111. The terminal component 2 includes a terminal 21, a clamping structure 22, and an insulating and sealing structure 23. The terminal 21 is connected to the electrode component 3, and the clamping structure 22 is connected to the first housing wall 111. The clamping structure 22 clamps the terminal 21, and the clamping structure 22 and the terminal 21 are insulated and sealed together by the insulating and sealing structure 23.

[0184] For example, referring to Figures 3 and 4, the housing 1 has a receiving cavity 13. The electrode component 3 includes an active material coating portion 32 and an electrode tab portion 33. The active material coating portion 32 is received in the receiving cavity 13, and the electrode tab portion 33 is connected to the active material coating portion 32. The electrode component 3 includes one or more electrode assemblies (the electrode assemblies can be in the form of a wound or stacked sheet). The portion of the electrode assembly with the current collector coated with the active material layer constitutes the active material coating portion 32, and the portion without the active material layer formed the electrode tab portion 33. The electrode tab portion 33 includes multiple layers of electrode tabs.

[0185] For example, referring to Figures 3 and 4, the electrode post 2 and the first shell wall 111 are located on the same side of the electrode post 3. That is, the electrode post 2 is located on the side where the first shell wall 111 is located, so that the electrode post 2 is located on the first shell wall 111. For example, when the first shell wall 111 is above the electrode post 3, the electrode post 2 is also above the electrode post 3; when the first shell wall 111 is below the electrode post 3, the electrode post 2 is also below the electrode post 3; when the first shell wall 111 is on the side of the electrode post 3, the electrode post 2 is also on the same side of the electrode post 3.

[0186] The pole component 2 is connected to the first shell wall 111 through the clamping structure 22. The connection method between the clamping structure 22 and the first shell wall 111 is not limited. For example, the two can be an integral part (i.e., integrally formed), or they can be separate parts and assembled together, such as by welding, riveting, etc.

[0187] For example, referring to Figures 3 and 4, to achieve the connection between the electrode post 21 and the electrode component 3, the active material coating portion 32 can be connected to the electrode post 21 through the conductive portion 4, forming an electrical connection. The connection method between the conductive portion 4 and the electrode post 21 is not limited, and may include, but is not limited to, ultrasonic welding, a combination of ultrasonic pre-welding and laser welding, resistance welding, pressure welding, brazing, bonding, etc. In this application, the electrode post 21 can be used as a positive electrode post to connect to the positive electrode component 3, or as a negative electrode post to connect to the negative electrode component 3.

[0188] For example, referring to Figure 4, the conductive part 4 may include both a tab 33 and a conductive element 41 connected to the tab 33. The tab 33 is indirectly connected to the terminal post 21 through the conductive element 41. Therefore, by indirectly connecting the tab 33 and the terminal post 21 through the conductive element 41, the length of the tab 33 can be shortened, improving issues such as wrinkling, bending, and breakage of the tab. Furthermore, the shape and material of the conductive element 41 can be flexibly designed to reduce the difficulty of connecting it to the terminal post 21 and improve the ease of connection between the conductive element 41 and the terminal post 21. Alternatively, in other embodiments, the conductive part 4 may only include the tab 33, which is directly connected to the terminal post 21, thus eliminating the need for the conductive element 41 and the connection process between the conductive element 41 and the tab 33.

[0189] For example, referring to Figures 3 and 4, at least a portion of the insulating sealing structure 23 is disposed between the portion of the clamping structure 22 used to clamp the electrode post 21 and the portion of the electrode post 21 clamped by the clamping structure 22. This satisfies the insulation requirements between the electrode post 21 and the housing 1 when the clamping structure 22 is connected to the first housing wall 111, and also satisfies the sealing requirements at the location where the electrode post 21 is installed. The material of the insulating sealing structure 23 can be flexibly selected, as long as it meets the required insulation and / or sealing functions at the desired location. Examples of such embodiments will be described later.

[0190] Please refer to Figures 5-8. Figure 5 is a cross-sectional view of the pole post component provided in some embodiments of this application; Figure 6 is a partial enlarged view of part A shown in Figure 5; Figure 7 is a perspective view of the pole post component provided in some embodiments of this application; and Figure 8 is a schematic diagram of the clamping structure shown in Figure 7. In some embodiments of this application, to achieve clamping of the pole post 21 by the clamping structure 22, the clamping structure 22 is arranged around the pole post 21, and the clamping structure 22 includes a first clamping member 221 and a second clamping member 222 connected together. The clamping structure 22 clamps the pole post 21 through the first clamping member 221 and the second clamping member 222.

[0191] The clamping structure 22 is arranged around the pole post 21, which can be understood as the clamping structure 22 surrounding the pole post 21 along the extension direction of its cross-sectional outline. The cross-section of the pole post 21 refers to the cross-section obtained by cutting the pole post 21 with a plane perpendicular to its central axis L. For example, when the cross-section of the pole post 21 is circular, the pole post 21 is a circular pole post, and the cross-sectional outline of the pole post 21 is circular; as another example, when the cross-section of the pole post 21 is racetrack-shaped, the pole post 21 is a racetrack-shaped pole post, and the cross-sectional outline of the pole post 21 is racetrack-shaped. Of course, the cross-section of the pole post 21 is not limited to circular or racetrack-shaped; the cross-section of the pole post 21 can also be other shapes, such as rectangular, elliptical, etc.

[0192] Therefore, by setting the clamping structure 22 to surround the electrode post 21, the clamping structure 22 can clamp the electrode post 21 only at the edge of the electrode post 21 without obstructing the surface of the electrode post 21 for connection with the electrode component 3, or the surface of the electrode post 21 for connection with the busbar component, thereby enabling the electrode post 21 to be connected to the electrode component 3 and the busbar component respectively.

[0193] The connection method of the first clamping member 221 and the second clamping member 222 is not limited. For example, the first clamping member 221 and the second clamping member 222 can be directly connected or indirectly connected. For example, the first clamping member 221 and the second clamping member 222 can be separate parts and assembled (such as welding, bonding, riveting, etc.), or the first clamping member 221 and the second clamping member 222 can be processed into a single part by integral molding to achieve a natural connection between the two.

[0194] Referring again to Figures 5-8, in the embodiments of this application, the first clamping member 221 is bent toward the pole post 21 and forms a clamping groove 223 with the second clamping member 222 to clamp the pole post 21. The first clamping member 221 includes a first clamping portion 2211 bent toward the pole post 21. There are multiple first clamping portions 2211 arranged circumferentially along the pole post 21, and at least two adjacent first clamping portions 2211 form a discontinuity 2213. That is, two adjacent first clamping portions 2211 can be separated at the discontinuity 2213 after bending, with a gap between them.

[0195] The size of the interruption 2213 is not limited. For example, it can be a slit, so that there is no obvious gap between two adjacent first clamping parts 2211 at the interruption 2213. Alternatively, the interruption 2213 can be a notch with a certain width, so that there is an obvious gap between two adjacent first clamping parts 2211 at the interruption 2213.

[0196] In this way, the first clamping member 221 can define the clamping groove 223 together with the second clamping member 222 through the first clamping part 2211 bent toward the pole post 21. The edge part of the pole post 21 is clamped in the clamping groove 223, thereby realizing the clamping and fixing of the pole post 21 by the clamping structure 22.

[0197] The first clamping portion 2211 bends toward the pole post 21, which can be understood as the first clamping portion 2211 extending in a direction close to the central axis L of the pole post 21. The multiple first clamping portions 2211 are arranged circumferentially along the pole post 21, which can be understood as the multiple first clamping portions 2211 being arranged sequentially along the direction of the clamping structure 22 surrounding the pole post 21. For example, when the pole post 21 is circular, the multiple first clamping portions 2211 are arranged sequentially along a circular trajectory; or, for example, when the pole post 21 is racetrack-shaped, the multiple first clamping portions 2211 are arranged sequentially along a racetrack-shaped trajectory. The shape of the pole post 21 refers to the cross-sectional shape of the pole post 21.

[0198] The first clamping part 2211 may be at least two, but the number is not limited. Except for the location forming the discontinuity 2213, the ends of two adjacent first clamping parts 2211 that are close to each other may be spaced apart or not spaced apart, and may be connected at the non-spaced positions. For example, when the first clamping member 221 includes only two first clamping parts 2211, the ends of the two first clamping parts 2211 that are close to each other are connected, and a discontinuity 2213 is formed between the other ends of the two first clamping parts 2211 that are close to each other. In this case, only one discontinuity 2213 is formed on the first clamping part 2211. As another example, when the first clamping member 221 includes only two first clamping parts 2211, a discontinuity 2213 is formed between the ends of the two first clamping parts 2211 that are close to each other, and a discontinuity 2213 is also formed between the other ends of the two first clamping parts 2211 that are close to each other. In this case, two discontinuities 2213 are formed on the first clamping part 2211.

[0199] Referring to Figures 9-14, Figure 9 is a schematic diagram of the clamping structure 22 before assembly according to some embodiments of this application; Figure 10 is a frontal projection view of the clamping structure 22 shown in Figure 9; Figures 11-13 are assembly process diagrams of the pole post component 2 according to some embodiments of this application; and Figure 14 is a partial enlarged view of part B shown in Figure 13. Exemplarily, before the first clamping member 221 is bent, it can be in a straight state (e.g., as shown in Figure 9), and several pre-made grooves 2214 are provided on the first clamping member 221. The pre-made grooves 2214 are formed by a recess in the first clamping member 221 from the end away from the second clamping member 222 towards the second clamping member 222. Referring to Figures 7 and 8, after the first clamping member 221 is bent, the first clamping portion 2211 extends towards the pole post 21, and a clamping groove 223 is formed between the first clamping member 221 and the second clamping member 222, thereby clamping the pole post 21.

[0200] After the first clamping member 221 is bent, due to the deformation of the first clamping part 2211, the pre-made groove 2214 is transformed into an interruption 2213 between two adjacent first clamping parts 2211. The interruption 2213 penetrates the end of the first clamping member 221 away from the connection position of the first clamping member 221 and the second clamping member 222, and the interruption 2213 penetrates the wall thickness of the first clamping member 221.

[0201] Before the first clamping member 221 is bent, the perimeter of all positions of the first clamping member 221 is the same. However, after bending towards the pole post 21, the perimeter of the first clamping member 221 becomes smaller closer to the central axis L of the pole post 21. That is, after bending, the multiple first clamping parts 2211 need to be closer together. By setting a pre-formed groove 2214, the mutual proximity of the first clamping parts 2211 is absorbed, so that the two first clamping parts 2211 on both sides of the pre-formed groove 2214 do not stack or arch. In other words, during the bending process, the two first clamping parts 2211 on both sides of the pre-formed groove 2214 can extend and move closer towards the pre-formed groove 2214, so that the pre-formed groove 2214 shrinks and eventually becomes an intermittent opening 2213. This can effectively adapt to the phenomenon of the perimeter shortening caused by the bending of the first clamping member 221, without forming material accumulation, wrinkles, or redundancy. Here, the perimeter of the first clamping member 221 refers to the length of the first clamping member 221 along the direction surrounding the pole post 21.

[0202] The size of the interruption 2213 varies depending on the width of the prefabricated groove 2214. This means the gap between two adjacent first clamping parts 2211 can be specifically set according to the actual situation. For example, the interruption 2213 can be a slit, so there is no obvious gap between two adjacent first clamping parts 2211 at the interruption 2213. Alternatively, the interruption 2213 can be a notch with a certain width, so there is a clear gap between two adjacent first clamping parts 2211 at the interruption 2213.

[0203] In the above technical solution, since an interruption 2213 is formed between at least two adjacent first clamping parts 2211, it means that during the bending process, at least two adjacent first clamping parts 2211 can extend into the prefabricated groove 2214 used to transform into the interruption 2213, so that the two first clamping parts 2211 can separate at the opening of the interruption 2213 after bending (i.e., have a gap), without stacking or wrinkling each other, thereby improving the redundant problems such as material accumulation and wrinkles that exist after the first clamping part 221 is bent.

[0204] In this way, the redundant problems such as material accumulation and wrinkles caused by the bending of the clamping structure 22 are improved, which helps to improve the reliability of the terminal 21 being clamped by the clamping structure 22, and enhances the terminal 21's ability to resist internal and external pressure, thereby improving the reliability of the battery cell 102. Moreover, it makes it less likely for gaps to appear at the electrical connection positions between the terminal 21 and the electrode component 3 and / or the bus component, thereby improving the problems of increased contact resistance, temperature rise, and reduced conductive area caused by gaps, which in turn helps to improve the operational reliability of the battery cell 102 and ensure power supply efficiency and power supply requirements.

[0205] Furthermore, when the first clamping member 221 is located outside the housing 1 and needs to be covered with insulating material, the redundancy problems such as material accumulation and wrinkles caused by bending of the first clamping member 221 are improved. This improves the overall coverage of the first clamping member 221 with insulating material, thereby reducing the probability of short circuit between the housing 1 and the busbar component, and thus improving the reliability of the battery cell 102. Of course, this application is not limited to this. In other embodiments of this application, the first clamping member 221 may be located inside the housing 1, and the second clamping member 222 may be located outside the housing 1 as needed.

[0206] Please refer again to Figures 7 and 8. In some embodiments of this application, multiple first clamping portions 2211 are spaced apart circumferentially along the pole post 21, such that an interruption 2213 is formed between each pair of adjacent first clamping portions 2211, and each pair of adjacent interruptions 2213 constitutes one first clamping portion 2211. Multiple interruptions 2213 are spaced apart circumferentially along the pole post 21. Therefore, by setting multiple interruptions 2213 spaced apart along the direction surrounding the pole post 21 with the clamping structure 22, more space is reserved to allow the bent first clamping portions 2211 to extend, thereby better solving the redundancy problems such as material accumulation and wrinkles caused by the bending of the clamping structure 22.

[0207] The location of the interruption 2213 can be specifically designed according to the shape of the pole post 21. On the one hand, it can be selected at a location where material accumulation and wrinkling are likely to occur after the first clamping member 221 is bent. On the other hand, it should also meet the requirement that the distribution of multiple first clamping parts 2211 can reliably clamp the pole post 21. Furthermore, the insulating sealing structure 23 may include a sealing member 231 disposed between the clamping structure 22 and the pole post 21. When selecting the location of the interruption 2213, it should also meet the requirement that the multiple first clamping parts 2211 can maintain uniform pressure on the sealing member 231 to ensure the sealing performance between the clamping structure 22 and the pole post 21.

[0208] In some embodiments of this application, please refer to FIG15, which is a frontal projection view of the pole post component provided in some embodiments of this application. The pole post 21 is a circular structure (i.e., the cross-section of the pole post 21 is circular), and multiple interruptions 2213 are evenly spaced along the circumference (i.e., circular trajectory) of the pole post 21. That is, the circumferential spacing between any two adjacent interruptions 2213 is equal, so that multiple first clamping parts 2211 can be evenly spaced along the circumference of the pole post 21. In this way, the multiple first clamping parts 2211 can be subjected to uniform force to more reliably clamp the pole post 21, improve the reliability of the pole post 21 being clamped, and help ensure the pressure resistance of the pole post 21. Moreover, the multiple first clamping parts 2211 can also make the sealing element 231 between the clamping structure 22 and the pole post 21 uniformly pressed, thereby helping to ensure the sealing between the clamping structure 22 and the pole post 21.

[0209] In other embodiments of this application, referring to Figures 7 and 8, the pole post 21 is an elongated structure (i.e., the cross-section of the pole post 21 is elongated, such as rectangular, elliptical, or racetrack-shaped). First clamping portions 2211 are distributed at both ends of the pole post 21 (i.e., at both ends along the length direction F4) and on both sides of the pole post 21 (i.e., on both sides along the width direction F5). It is worth noting that one or more first clamping portions 2211 can be distributed on any side of the pole post 21 in the width direction, and one or more first clamping portions 2211 can be distributed at any end of the pole post 21 in the length direction, or at intervals along the width direction of the pole post 21.

[0210] Therefore, both ends of the elongated pole 21 along its length and both sides along its width can be clamped by the first clamping parts 2211. This allows the multiple first clamping parts 2211 to clamp the pole 21 more stably, improving the reliability of the clamping and ensuring the pressure resistance of the pole 21. Furthermore, the multiple first clamping parts 2211 also ensure that the sealing element 231 between the clamping structure 22 and the pole 21 is pressed more evenly, thus guaranteeing the seal between the clamping structure 22 and the pole 21.

[0211] Referring to Figures 7 and 8, in some embodiments of this application, the pole post 21 has a racetrack-shaped structure, which consists of a rectangle and two arcs located at both ends of the rectangle's length. Discontinuities 2213 are arranged corresponding to the connection points between the rectangle and the arcs. It is worth noting that there are four connection points between the rectangle and the arcs in the racetrack shape, and at least one of these four points may have a discontinuity 2213. For example, two diagonally opposite points in these four locations may have discontinuities 2213. Even more exemplarily, each of these four locations may have a discontinuity 2213 (as shown in Figure 7).

[0212] Therefore, for the racetrack-shaped pole post 21, when the first clamping member 221 of the transition structure 22 surrounding it is bent, the rectangular and arc-shaped connection positions of the pole post 21 are prone to redundant problems such as material accumulation and wrinkles. Setting the discontinuity 2213 here can more directly improve the redundant problems such as material accumulation and wrinkles that occur in the first clamping member 221, and also enable the first clamping part 2211 to be distributed at both ends of the length and both sides of the width of the pole post 21, thereby improving the clamping reliability of the pole post 21.

[0213] For example, referring to Figures 6-8, the pole post 21 has a racetrack-shaped structure. The first clamping member 221 includes four interruptions 2213 and four first clamping portions 2211. An interruption 2213 is provided at each of the four vertices of the racetrack-shaped rectangle, so that a first clamping portion 2211 is provided at each of the two ends of the pole post 21's length (i.e., the two ends in the length direction F4) and each of the two sides of the pole post 21's width (i.e., the two sides in the width direction F5). Thus, the four first clamping portions 2211 can clamp the pole post 21 more stably, improving the reliability of the clamping of the pole post 21 and helping to ensure the pressure resistance of the pole post 21. Furthermore, the four first clamping portions 2211 can also ensure that the sealing member 231 between the clamping structure 22 and the pole post 21 is pressed more evenly, thereby helping to ensure the sealing performance between the clamping structure 22 and the pole post 21.

[0214] Please refer to Figure 8. In some embodiments of this application, the end of the interruption 2213 near the connection position between the first clamping member 221 and the second clamping member 222 is a closed end a1, and the end of the interruption 2213 that passes through the first clamping member 221 and is away from the connection position between the first clamping member 221 and the second clamping member 222 is an open end a2. The width W2 of the interruption 2213 at the open end a2 is greater than the width W1 of the interruption 2213 at the closed end a1.

[0215] Referring to Figures 7-9, since the first clamping member 221 bends towards the pole post 21, the circumference of the position of the first clamping member 221 further away from the connection position between the first clamping member 221 and the second clamping member 222 is shorter. The shorter the circumference, the more likely it is to cause redundant problems such as material accumulation and wrinkles. Setting the interruption 2213 to have a relatively large width W2 at the opening end a2 indicates that more width space is reserved in the inner circle position with a shorter circumference to absorb the extension of the first clamping part 2211, thereby more reliably improving the redundant problems such as material accumulation and wrinkles caused by the bending of the first clamping member 221.

[0216] Please refer to Figure 8. In some embodiments of this application, the width W of the interruption 2213 gradually increases along the direction from the closed end a1 to the open end a2. Referring to Figures 7-9, since the first clamping member 221 bends toward the pole post 21, the circumference of the first clamping member 221 gradually shortens along the direction away from the connection position between the first clamping member 221 and the second clamping member 222. Setting the interruption 2213 to have a width that gradually increases along the direction from the closed end a1 to the open end a2 can match the trend of the shortening circumference of the first clamping member 221, so as to more effectively absorb the extension of the first clamping part 2211, thereby more reliably improving the redundancy problems such as material accumulation and wrinkles caused by the bending of the first clamping member 221.

[0217] Please refer to Figures 4 and 7-13. In some embodiments of this application, the first clamping member 221 includes a surrounding portion 2212 (for example, the portion below the dashed line shown in Figure 10 is the surrounding portion 2212, and the portion above the dashed line is the first clamping portion 2211). The surrounding portion 2212 connects the first clamping portion 2211 and the second clamping member 222. The surrounding portion 2212 extends along the inner and outer directions (e.g., the first direction F1) of the first shell wall 111 and extends around the entire circumference of the pole post 21. The first clamping portion 2211 and the surrounding portion 2212 are integral parts, and the surrounding portion 2212 bends and extends towards the central axis L of the pole post 21 relative to the surrounding portion 2212. The interruption 2213 extends from the connection between the surrounding portion 2212 and the first clamping portion 2211 in a direction away from the surrounding portion 2212 to penetrate the first clamping member 221. The surrounding portion 2212 is a continuous and uninterrupted annular part that surrounds the entire circumference of the pole post 21. The first clamping part 2211 and the surrounding part 2212 are an integral part (i.e., an integrally molded part), which means that the surrounding part 2212 and the first clamping part 2211 are not assembled and connected, but are two parts of a single structural component.

[0218] Therefore, the first clamping member 221 includes a non-bending surrounding portion 2212, and the non-bending surrounding portion 2212 does not have an interruption 2213, which helps to improve the overall structural strength of the clamping structure 22 and improve the clamping reliability of the clamping structure 22 for the pole post 21. Moreover, only a part of the first clamping member 221 bends (i.e., the first clamping portion 2211 bends, while the surrounding portion 2212 does not bend), which helps to reduce the bending difficulty of the first clamping member 221. In addition, since the first clamping portion 2211 and the surrounding portion 2212 are integral parts, it is easier to process the first clamping member 221.

[0219] Of course, this application is not limited to this. For example, in other embodiments of this application, the first clamping member 221 may be configured to include only the first clamping portion 2211, without including the circumferential portion 2212 that extends around the entire circumference of the pole post 21. In this case, the closed end a1 of the break 2213 is sealed by the second clamping member 222.

[0220] Please refer to Figures 16 and 17. Figure 16 is a perspective view of the pole member provided in some embodiments of this application; Figure 17 is a schematic diagram of the clamping structure shown in Figure 16. In some embodiments of this application, the first clamping part 2211 has reinforcing ribs 22111 protruding in a direction away from the pole 21. Therefore, by providing reinforcing ribs 22111 on the first clamping part 2211, the deformation problem of the first clamping part 2211 can be improved, the clamping reliability of the pole 21 can be enhanced, and the pressing reliability of the seal 231 between the clamping structure 22 and the pole 21 can be improved, thereby helping to ensure the sealing between the clamping structure 22 and the pole 21.

[0221] Referring to Figures 16 and 17, in some embodiments of this application, along the direction of the first clamping member 221 surrounding the pole post 21, the reinforcing rib 22111 is located at the center of the first clamping portion 2211, and the reinforcing rib 22111 extends along the bending trajectory of the first clamping portion 2211. Therefore, by placing the reinforcing rib 22111 at the center of the first clamping portion 2211, and by setting the reinforcing rib 22111 to extend along the bending trajectory of the first clamping portion 2211, the deformation problem of the first clamping portion 2211 can be effectively improved with a relatively small number of reinforcing ribs 22111, thereby helping to reduce material costs and product weight. Of course, this application is not limited to this; for example, in other embodiments of this application, multiple reinforcing ribs 22111 may be provided at intervals on the first clamping portion 2211.

[0222] Please refer to Figures 5-8. In some embodiments of this application, the first clamping member 221 and the second clamping member 222 are integral parts (i.e., integrally formed parts). That is, the first clamping member 221 and the second clamping member 222 are not assembled together, but are two parts of a single structural component. For example, they can be integrally stamped or integrally extruded. Therefore, by making the first clamping member 221 and the second clamping member 222 an integral part, the assembly steps of the battery cell 102 as a whole can be reduced, and the assembly efficiency of the battery cell 102 can be improved.

[0223] When the first clamping member 221 and the second clamping member 222 are connected by welding, and one of the first clamping member 221 and the second clamping member 222 is connected to the first shell wall 111 by welding, the problem of cracking at the first welded part caused by welding one part first and the other part later can be avoided. Therefore, by making the first clamping member 221 and the second clamping member 222 into a single piece, it is beneficial to improve the connection reliability of the first clamping member 221 and the second clamping member 222, as well as the connection reliability between the clamping structure 22 and the first shell wall 111.

[0224] When the first clamping member 221 and the second clamping member 222 are assembled and connected, the assembly accuracy of the first clamping member 221 and the second clamping member 222 needs to be strictly limited to avoid problems caused by the first clamping member 221 and the second clamping member 222 being too loose, which would result in high requirements for assembly accuracy and reduce assembly efficiency. For example, if the first clamping member 221 and the second clamping member 222 are assembled too loosely, the sealing member 231 between the clamping structure 22 and the pole post 21 may not be able to be pressed tightly, affecting the sealing performance between the clamping structure 22 and the pole post 21. When the insulating sealing structure 23 includes an insulating member 233 (such as insulating plastic) located between the clamping structure 22 and the pole post 21, if the first clamping member 221 and the second clamping member 222 are assembled too tightly, the insulating member 233 may be damaged, causing the insulating member 233 to crack and affecting the insulation performance between the clamping structure 22 and the pole post 21. Therefore, by making the first clamping member 221 and the second clamping member 222 into one piece, it is beneficial to improve the sealing and insulation between the clamping structure 22 and the pole post 21, reduce the assembly accuracy requirements, and improve the assembly efficiency.

[0225] Please refer to Figures 11-14. In some embodiments of this application, when the first clamping member 221 and the second clamping member 222 are integral parts, the second clamping member 222 can be a pre-formed part connected to the first shell wall 111, and the first clamping member 221 is a riveted part. That is, when the clamping structure 22 is assembled with the pole post 21, the shape of the second clamping member 222 does not change significantly. Instead, at least a portion of the first clamping member 221 is bent by riveting to form a clamping groove 223 with the second clamping member 222, thereby clamping the pole post 21. This eliminates the bending process during the assembly of the second clamping member 222 and the pole post 21, thus reducing the assembly difficulty of the clamping structure 22 and the pole post 21.

[0226] The form of the first clamping member 221 is not limited. For example, it can be a form that includes both the above-mentioned surrounding part 2212 and the first clamping part 2211, or it can be a form that does not include the above-mentioned surrounding part 2212 and only includes the first clamping part 2211.

[0227] The connection method between the second clamping member 222 and the first shell wall 111 is not limited; it can be a separate part that is assembled and connected, or it can be a single part.

[0228] Please refer to Figures 11-14. In some embodiments of this application, the second clamping member 222 includes a second clamping portion 2221. The second clamping portion 2221 cooperates with the first clamping portion 2211 to define a clamping groove 223. The second clamping portion 2221 has a stepped structure 22211 that protrudes in a direction away from the first clamping portion 2211.

[0229] Therefore, since the second clamping part 2221 has a stepped structure 22211 protruding away from the first clamping part 2211, the structural strength of the second clamping part 2221 can be strengthened, which is beneficial to improving the support strength of the second clamping part 2221 for the pole post 21. Thus, when riveting the first clamping member 221, the second clamping part 2221 and the first clamping part 2211 can cooperate to reliably clamp the pole post 21 and clamp the sealing member 231 located between the clamping structure 22 and the pole post 21, thereby improving the sealing performance of the mating position between the clamping structure 22 and the pole post 21. It also improves the problem of decreased sealing performance caused by the deformation of the second clamping part 2221 due to the elastic force of the sealing member 231, further improving the sealing performance of the mating position between the clamping structure 22 and the pole post 21.

[0230] In some embodiments, the second clamping portion 2221 can be processed into a shape that gradually tilts towards the first clamping portion 2211 along the direction close to the central axis L of the pole post 21 before engaging with the pole post 21, thereby providing a certain amount of anti-deformation. After riveting the first clamping member 221, the second clamping portion 2221 no longer tilts under the elastic force of the seal 231, so as to provide a more reliable clamping capability, so that the compression of the seal 231 between the clamping structure 22 and the pole post 21 can be reliably satisfied, thereby improving the sealing performance of the engagement position between the clamping structure 22 and the pole post 21.

[0231] In some embodiments of this application, referring to FIG18, FIG18 is a partial cross-sectional view of a battery cell provided in some embodiments of this application; the clamping structure 22 includes a transfer body 2222, and the transfer body 2222 is integrally formed with at least one of the first clamping member 221 and the second clamping member 222. The transfer body 2222 is integrally formed with the first shell wall 111 (i.e., integrally molded), for example, it can be integrally stamped or integrally extruded. Therefore, by processing at least a portion of the clamping structure 22 and the first shell wall 111 as integral parts, the step of assembling the transfer body 2222 and the first shell wall 111 can be eliminated, improving production efficiency and reducing costs.

[0232] For example, when the first clamping member 221 and the second clamping member 222 are integrated, the adapter body 2222, the first clamping member 221, the second clamping member 222 and the first shell wall 111 are integrated.

[0233] For example, when the second clamping member 222 is a pre-formed part, the adapter body 2222 can be a part of the second clamping member 222. The adapter body 2222 is a pre-formed structure. Before and after the clamping structure 22 is assembled with the pole post 21, the shape of the adapter body 2222 remains almost unchanged.

[0234] Alternatively, in some other embodiments of this application, the clamping structure 22 includes a transition body 2222, which is integral with at least one of the first clamping member 221 and the second clamping member 222. The transition body 2222 is assembled and connected to the first shell wall 111. That is, the clamping structure 22 and the first shell wall 111 are processed and formed separately, and the two are fixedly connected by an assembly process (such as welding, riveting, bonding, etc.).

[0235] Therefore, by setting the clamping structure 22 to be assembled and connected to the first shell wall 111 via the adapter body 2222, it is convenient to process the clamping structure 22 and the first shell wall 111 separately, which is beneficial to the processing and manufacturing of the battery cell 102. Moreover, it is beneficial to meet the sealing requirements. When the clamping structure 22 is assembled with the first shell wall 111, the pressure on the first shell wall 111 can be reduced, thereby protecting the first shell wall 111.

[0236] For example, referring to FIG19, FIG19 is a partial cross-sectional view of a battery cell provided in some embodiments of the present application; when the first clamping member 221 and the second clamping member 222 are integrated, the adapter body 2222, the first clamping member 221 and the second clamping member 222 are integrated, and the clamping structure 22 is integrated as a whole. Then the clamping structure 22 is assembled with the first shell wall 111 using the adapter body 2222.

[0237] For example, when the second clamping member 222 is a pre-formed part, the adapter body 2222 can be a part of the second clamping member 222. The adapter body 2222 is a pre-formed structure. Before and after the clamping structure 22 is assembled with the pole post 21, the shape of the adapter body 2222 remains almost unchanged.

[0238] The electrode post 21 in the electrode post component 2 needs to meet insulation requirements with the first shell wall 111 to prevent the first shell wall 111 from becoming charged. Since the clamping structure 22 surrounds the electrode post 21, the insulating sealing structure 23 insulates the clamping structure 22 from the electrode post 21, thereby insulating the electrode post 21 from the first shell wall 111. Furthermore, the insulating sealing structure 23 makes the mating position of the clamping structure 22 and the electrode post 21 sealed, so as to isolate the inside and outside of the shell 1 after the clamping structure 22 and the first shell wall 111 are assembled and connected. This reduces the risk of electrolyte inside the shell 1 leaking out of the shell 1 from the mating position of the clamping structure 22 and the electrode post 21, and also reduces the risk of liquids or dust outside the shell 1 entering the shell 1 from the mating position of the clamping structure 22 and the electrode post 21, thereby improving the reliability of the battery cell 102.

[0239] In other words, since the electrode component 2 includes not only the electrode 21 connected to the electrode component 3, but also a clamping structure 22 assembled and connected to the first shell wall 111, and at least part of an insulating sealing structure 23 is provided between the clamping structure 22 and the electrode 21, the insulating sealing structure 23 plays an insulating and sealing role at the connection between the electrode 21 and the clamping structure 22, so that the electrode component 2 itself has self-sealing properties. When installing the electrode component 2 onto the first shell wall 111, there is no need to consider the sealing problem between the clamping structure 22 and the first shell wall 111. Therefore, it is not necessary to apply a large force to the electrode component 2 in order to meet the sealing of the connection between the clamping structure 22 and the first shell wall 111, thereby improving the stress deformation problem of the first shell wall 111, which is conducive to reducing the wall thickness of the first shell wall 111, reducing material costs, and reducing the weight of the battery cell 102, realizing lightweight production and improving energy density.

[0240] The structure of the housing 1 is not limited. For example, the housing 1 includes a shell body that helps to form the receiving cavity 13, one end of the shell body has an opening, and the end of the shell body opposite the opening is a first shell wall 111. Or, for example, the housing 1 includes a shell cover that helps to form the receiving cavity 13, and the shell cover is the first shell wall 111. Thus, the structural design of the housing 1 is flexible, and the placement of the pole post component 2 is flexible.

[0241] When the end of the shell body opposite to the opening is the first shell wall 111, the shell body can be a single piece and includes the first shell wall 111 and the second shell wall. The second shell wall surrounds the edge of the first shell wall 111 and extends from the edge of the first shell wall 111 toward one side in the thickness direction of the first shell wall 111. The end of the second shell wall opposite to the first shell wall 111 defines the opening. A cavity is defined between the first shell wall 111 and the second shell wall. The cavity constitutes at least a portion of the receiving cavity 13.

[0242] In the above technical solution, since the electrode component 3 housed in the housing 1 is connected to the terminal component 2 installed on the first housing wall 111, when the battery device 100 vibrates or deforms, the terminal components 2 connected by the busbar component will pull on each other. Since the terminal component 2 is set on the end wall of the housing 11 opposite to the opening, the force on the terminal component 2 will be preferentially transmitted to the housing 11 instead of directly acting on the housing cover 12. This not only extends the distance of force transmission to the connection between the housing 11 and the housing cover 12, but also causes the housing 11 to deform preferentially when subjected to force, thereby reducing the force at the connection between the housing 11 and the housing cover 12. This can effectively reduce the probability of cracking at the connection between the housing 11 and the housing cover 12 during the use of the battery device 100 and improve the reliability of the battery cell 102.

[0243] Furthermore, since the connection between the casing 11 and the cover 12 is less prone to cracking, there is no need to increase their wall thickness to improve the reliability of the connection. This helps reduce weight and material costs, and facilitates the miniaturization of the battery cell 102 or the improvement of its energy density. The connection method between the casing 11 and the cover 12 is not limited; for example, it can be bonding, welding, etc.

[0244] For example, when the end wall of the housing 11 opposite to the opening 113 serves as the first housing wall 111 for mounting the terminal post component 2, if the terminal post component 2 is first assembled to the mounting hole 112 on the first housing wall 111 and then the electrode component 3 is installed into the housing 11, it is difficult to connect the electrode component 3 and the terminal post component 2. In some embodiments of this application, referring to Figures 20 and 21, Figure 20 is an intermediate assembly state diagram of a battery cell provided in some embodiments of this application; Figure 21 is a partial cross-sectional view of the battery cell after assembly shown in Figure 20; the electrode component 3 can be connected to the terminal post component 2 first, and then the terminal post component 2 can be assembled and connected to the first housing wall 111, thereby satisfying the connection requirements of the electrode component 3 and the terminal post component 2, as well as the connection requirements of the terminal post component 2 and the first housing wall 111, thereby improving the reliability and manufacturability of the battery cell 102.

[0245] Moreover, this processing sequence allows for an effective reduction in the length of the conductive portion 4. For example, as long as the electrode component 3 is connected to the terminal component 2 first, and the terminal component 2 is then connected to the first shell wall 111, the material and cost of the conductive portion 4 can be saved, the redundancy of the conductive portion 4 can be reduced, the risk of short circuit can be reduced, and the space occupied by the conductive portion 4 within the shell 1 can be reduced, which is beneficial to improving the energy density of the battery cell 102. The material of the shell 1 is not limited, and includes, but is not limited to, aluminum shell, steel shell, aluminum-plastic film, plastic, or other electrolyte-resistant materials.

[0246] In some embodiments of this application, the first clamping member 221 is disposed on the side of the second clamping member 222 away from the electrode component 3, thereby allowing the first clamping member 221 to be bent from the outside of the electrode post 21, reducing the assembly difficulty of the clamping structure 22. Of course, this application is not limited to this. For example, in other embodiments of this application, the second clamping member 222 may also be disposed on the side of the first clamping member 221 away from the electrode component 3, in which case the first clamping member 221 may be bent from the inside of the electrode post 21.

[0247] Please refer to Figures 21 and 22. Figure 22 is a partial cross-sectional view of a battery cell provided in some embodiments of this application. In some embodiments of this application, the first clamping member 221 is disposed on the side of the second clamping member 222 away from the electrode component 3, and the insulating sealing structure 23 includes a sealing member 231, at least a portion of which is clamped between the electrode post 21 and the second clamping member 222.

[0248] Therefore, the sealing element 231 can be positioned closer to the electrolyte inside the housing 1, which helps to better prevent the electrolyte from seeping into the mating area between the electrode post 21 and the clamping structure 22, reducing the problem of electrolyte leakage to the outside of the housing 1 through the mating area between the electrode post 21 and the clamping structure 22. The material of the sealing element 231 is not limited; for example, it can be a sealing material with good elasticity such as rubber.

[0249] In some embodiments of this application, as shown in FIG21, the electrode post 21 can be a composite electrode post, for example, it may include a first metal part 211 and a second metal part 212 made of different materials. The first metal part 211 is located on the side of the second metal part 212 away from the electrode component 3, and the second metal part 212 is connected to the electrode component 3. In this case, at least a portion of the sealing member 231 can be disposed on the side of the mating surface of the first metal part 211 and the second metal part 212 closer to the electrode component 3. In this way, the sealing member 231 can be used to prevent the electrolyte in the housing 1 from seeping into the mating surface of the first metal part 211 and the second metal part 212 and causing corrosion of the electrode post 21, thereby improving the reliability of the electrode post 21.

[0250] Please refer to Figures 23 and 24. Figure 23 is a partial cross-sectional view of a battery cell provided in some embodiments of this application; Figure 24 is a partial enlarged view of part C shown in Figure 23. In some embodiments of this application, the electrode post 21 can be a composite electrode post, for example, it can include a first metal part 211 and a second metal part 212 made of different materials. The first metal part 211 is located on the side of the second metal part 212 away from the electrode component 3, and the second metal part 212 is connected to the electrode component 3. In this case, a protective metal layer 213 can also be applied to the outer periphery of the first metal part 211 and the outer periphery of the second metal part 212 adjacent to the first metal part 211, thereby solving the problem of corrosion of the electrode post 21 caused by accidental infiltration of electrolyte into the interface between the first metal part 211 and the second metal part 212, and playing a role in corrosion prevention.

[0251] It is worth noting that when the electrode post 21 includes the aforementioned protective metal layer 213, the location of the seal 231 is not limited. For example, at least a portion of the seal 231 can be clamped between the electrode post 21 and the second clamping member 222. Specifically, at least a portion of the seal 231 can be located on the side of the mating surface of the first metal part 211 and the second metal part 212 near the electrode component 3. Alternatively, the seal 231 can be located in other positions, i.e., excluding the portion clamped between the electrode post 21 and the second clamping member 222, thereby achieving flexible placement of the seal 231.

[0252] In the embodiments of this application, the electrode post 21 can be used as either a negative electrode post or a positive electrode post. Exemplarily, when the electrode post 21 is used as a negative electrode post, it can be a copper-aluminum composite electrode post. Copper material is disposed on the side closest to the electrode component 3, matching the material of the electrode component 3, facilitating electrical connection between the two. Aluminum material is disposed on the side furthest from the electrode component 3, matching the material of the aluminum busbar component, facilitating electrical connection between the two. Since the copper-aluminum composite part is prone to corrosion when in contact with the electrolyte, a protective metal layer 213, such as a copper plating layer, is applied near the copper-aluminum interface to reduce the probability of corrosion. Exemplarily, when the electrode post 21 is used as a positive electrode post, it can be a pure aluminum electrode post. In this case, the electrode post 21 may or may not include the protective metal layer 213.

[0253] It is worth noting that the above description of materials is for illustrative purposes only. The material selection of the pole 21, the protective metal layer 213, and the busbar components can be specifically set according to actual requirements, and no restrictions are imposed here.

[0254] In some embodiments of this application, please refer to Figures 19 and 22. The second clamping member 222 includes a second clamping portion 2221 that cooperates with the first clamping portion 2211 to form a clamping groove 223. The second clamping portion 2221 includes an end portion 22211 and a root portion 22212. The end portion 22211 is disposed away from the first shell wall 111 relative to the root portion 22212 (i.e., disposed close to the central axis L of the pole post 21). At least a portion of the sealing member 231 is clamped between the root portion 22212 and the pole post 21.

[0255] Therefore, since the second clamping part 2221 is cantilevered, the end part 22211 is more likely to deform than the root part 22212, clamping at least a portion of the seal 231 between the less deformable root part 22212 of the second clamping part 2221 and the pole post 21, thereby improving the reliability of the seal 231 being clamped, ensuring the sealing compression of the seal 231, and improving the sealing reliability.

[0256] Please refer to Figure 25, which is a partial cross-sectional view of a battery cell provided in some embodiments of this application; when at least a portion of the seal 231 is clamped between the root 22212 and the terminal post 21, in some embodiments of this application, the seal 231 may also be clamped between the end 22211 and the terminal post 21.

[0257] Therefore, the sealing area of ​​the seal 231 is larger, which can get closer to the electrolyte inside the housing 1. This helps to better prevent the electrolyte from seeping into the mating position of the electrode post 21 and the clamping structure 22, and reduces the problem of electrolyte leaking out of the housing 1 through the mating position of the electrode post 21 and the clamping structure 22.

[0258] Referring to Figure 22, when at least a portion of the seal 231 is clamped between the root 22212 and the pole post 21, in some embodiments of this application, the seal 231 may also be clamped simultaneously between the first clamping member 221 and the pole post 21, so that at least a portion of the seal 231 is located between the connection position of the first clamping member 221 and the second clamping member 222 and the pole post 21. In this case, the seal 231 may also include a portion clamped between the end 22211 and the pole post 21 (e.g., as shown in Figure 25), or it may not include a portion clamped between the end 22211 and the pole post 21 (e.g., as shown in Figure 24).

[0259] Therefore, the sealing area of ​​the seal 231 is larger, which reduces the risk of electrolyte leakage from the mating position of the electrode 21 and the clamping structure 22 to the outside of the housing 1. In addition, when the electrode 21 is a composite electrode, the location of the seal 231 can more easily approach the composite material surface of the electrode, thereby more effectively improving the corrosion problem of the electrode 21.

[0260] In some embodiments of this application, referring to Figures 23 and 24, the seal 231 is a single piece, and also includes a portion clamped between the first clamping portion 2211 and the pole post 21. That is, the seal 231 is a single-piece molded part comprising multiple indivisible parts. As shown in Figure 24, the seal 231 may include a first sealing portion 2311, a second sealing portion 2312, and a third sealing portion 2313; the first sealing portion 2311 is clamped between the first clamping portion 2211 and the pole post 21, the second sealing portion 2312 is clamped between the second clamping portion 2211 and the pole post 21, and the third sealing portion 2313 is connected between the first sealing portion 2311 and the second sealing portion 2312, and is also clamped between the clamping structure 22 and the pole post 21. Therefore, the sealing area of ​​the seal 231 is larger, and the seal 231 is easier to process, thus improving the sealing effect.

[0261] In some embodiments of this application, please refer to Figures 11-14. One of the first clamping member 221 and the second clamping member 222 is a preformed member and the other is a riveted member. The preformed member is connected to the first shell wall 111. The insulating sealing structure 23 includes a sealing member 231, at least a portion of which is clamped between the pole post 21 and the preformed member.

[0262] That is, the first clamping member 221 is a preformed part, and the second clamping member 222 is a riveted part; or, the first clamping member 221 is a riveted part, and the second clamping member 222 is a preformed part. When the clamping structure 22 is assembled with the pole post 21, the shape of the preformed part remains basically unchanged. Instead, at least a portion of the riveted part in its initial form is bent by riveting to cooperate with the preformed part to form a clamping groove 223, thereby clamping the pole post 21. The connection method between the preformed part and the first shell wall 111 is not limited; it can be a separate part that is assembled together, or it can be a single piece.

[0263] In the above technical solution, since the shape of the preformed part does not change much before and after riveting, at least part of the seal 231 is clamped between the pole post 21 and the preformed part, so that the compression of the seal 231 can be controlled more easily, and the seal 231 can play a more reliable sealing role.

[0264] For example, when the seal 231 is a single piece, and the seal 231 includes a portion clamped between the riveted part and the pole post 21, and a portion clamped between the preform and the pole post 21, the seal 231 can be processed into a shape that matches the clamping structure 22. As the riveted part is riveted and bent, the seal 231 bends synchronously, thereby simplifying assembly and processing.

[0265] In some embodiments of this application, referring to FIG21, when the first clamping member 221 is disposed on the side of the second clamping member 222 away from the electrode component 3, the insulating sealing structure 23 may include an insulating support 232, at least a portion of which is disposed on the side of the second clamping member 222 away from the first clamping member 221. Thus, by providing the insulating support 232, the battery cell 102 can prevent short-circuit electrical connection between the clamping structure 22 and the electrode component 3 under operating environments such as vibration, thereby improving the reliability of the battery cell 102.

[0266] For example, referring to Figure 18, when the clamping structure 22 and the first shell wall 111 are integral, the insulating support 232 can also be integral (i.e., integrally formed, making the insulating support 232 an inseparable whole structural component) and also includes a first extension 2324 extending to the inner side of the first shell wall 111. Thus, the insulating support 232 can also simultaneously prevent short-circuit electrical connection between the first shell wall 111 and the electrode component 3, thereby further improving the reliability of the battery cell 102. Moreover, it can eliminate the need to set other insulating material supports between the first shell wall 111 and the electrode component 3, thereby simplifying the structure of the battery cell 102, reducing costs, and improving assembly efficiency.

[0267] For example, referring to FIG22, when the clamping structure 22 and the first shell wall 111 are separate parts, the insulating bracket 232 can be an integral part (i.e., integrally formed, so that the insulating bracket 232 is an integral structural part that cannot be separated) and also includes a second extension 2325 extending between the second clamping member 222 and the terminal post 21. Thus, the insulating bracket 232 can also simultaneously prevent short-circuit electrical connection between the second clamping member 222 and the terminal post 21, thereby further improving the reliability of the battery cell 102, simplifying the structure, reducing parts, and reducing costs.

[0268] In some embodiments of this application, referring to FIG22, when the insulating support 232 includes a second extension 2325 and the seal 231 includes a portion clamped between the root 22212 and the pole post 21, the second extension 2325 can be clamped between the end 22211 and the pole post 21, and a gap is maintained between it and the portion of the seal 231 clamped between the root 22212 and the pole post 21. This provides space for the compression deformation of the seal 231, ensuring that the compression amount of the seal 231 meets the requirements.

[0269] In some embodiments of this application, as shown in Figures 11-14, the first clamping member 221 is disposed on the side of the second clamping member 222 away from the electrode component 3; the insulating sealing structure 23 includes an insulating member 233, which includes an inner insulating portion 2331, at least a portion of which is clamped between the electrode post 21 and the first clamping member 221. Thus, by providing the inner insulating portion 2331, a relatively reliable insulating effect can be achieved between the electrode post 21 and the first clamping member 221.

[0270] In some embodiments of this application, as shown in Figures 11-14, when the insulating sealing structure 23 includes an insulating member 233, the insulating sealing structure 23 also includes a sealing member 231. At least a portion of the sealing member 231 is clamped between the pole post 21 and the second clamping member 222. The hardness of the insulating member 233 is greater than the hardness of the sealing member 231.

[0271] Therefore, when the first clamping member 221 is bent, since the sealing member 231 is clamped between the pole post 21 and the second clamping member 222, and the inner insulating part 2331 is clamped between the pole post 21 and the first clamping member 221, the bending position can be far away from the sealing member 231, thereby making it easier to control the compression of the sealing member 231 and improve the sealing effect.

[0272] For example, as shown in FIG14, the sealing element 231 and the inner insulating part 2331 are separate parts, and there is a gap between the sealing element 231 and the inner insulating part 2331. Therefore, the inner insulating part 2331 is designed to allow space for compression deformation of the sealing element 231, so that the compression amount of the sealing element 231 can meet the requirements. Moreover, since the sealing element 231 and the insulating part 233 are separate parts and not integrated, they can be flexibly configured according to actual conditions when assembling the pole post 21 and the clamping structure 22, reducing assembly difficulty and improving assembly efficiency.

[0273] Of course, this application is not limited to this. For example, in other embodiments of this application, the sealing element 231 and the insulating element 233 can be connected as an inseparable whole.

[0274] In some embodiments of this application, as shown in Figures 11-13, the inner insulating portion 2331 can be injection molded onto the pole post 21. Therefore, the inner insulating portion 2331 is not easily separated from the pole post 21, which improves the insulation effect and simplifies the assembly process. Of course, this application is not limited to this; for example, the inner insulating portion 2331 can also be configured to be assembled and connected to the pole post 21. Furthermore, the inner insulating portion 2331, injection molded onto the pole post 21, can play a shaping and restraining role against bending deformation of the first clamping member 221.

[0275] In some embodiments of this application, as shown in Figures 11-14, while the insulating member 233 includes an inner insulating portion 2331, the insulating member 233 may also include an outer insulating portion 2332, at least a portion of which is wrapped around the first clamping member 221 (i.e., wrapped around the side of the first clamping member 221 away from the clamping groove 223). Thus, the outer insulating portion 2332 can be used to isolate short-circuit electrical connections between the busbar component and the clamping structure 22, achieving an insulating effect between the busbar component and the clamping structure 22, thereby improving the reliability of the battery device 100.

[0276] In some embodiments of this application, as shown in FIG14, the inner insulating portion 2331 is connected to the outer insulating portion 2332. This reduces the risk of the outer insulating portion 2332 detaching from the clamping structure 22 and improves the reliability of the insulation between the outer insulating portion 2332 and the busbar component and the clamping structure 22.

[0277] The connection position between the inner insulating part 2331 and the outer insulating part 2332 is not limited. For example, in some embodiments, the inner insulating part 2331 and the outer insulating part 2332 are connected through a break 2213. In other embodiments, as shown in FIG19, the first clamping member 221 has a through hole 2215, through which the inner insulating part 2331 is connected to the outer insulating part 2332. In yet another embodiment, the inner insulating part 2331 and the outer insulating part 2332 are connected both through the break 2213 and through the through hole 2215 on the first clamping member 221.

[0278] Therefore, while ensuring the connection between the inner insulation part 2331 and the outer insulation part 2332, no new structural components are generated due to the connection, and no new parts protrude from the clamping structure 22. This simplifies the structural design and processing, reduces costs, and helps maintain the first clamping member 221 with relatively stable structural strength, thereby improving clamping reliability and sealing reliability.

[0279] When the inner insulating part 2331 is connected to the outer insulating part 2332, the connection method between the inner insulating part 2331 and the outer insulating part 2332 is not limited. For example, in some embodiments, the inner insulating part 2331 and the outer insulating part 2332 can be an integral part to achieve a natural connection, or in other embodiments, the inner insulating part 2331 and the outer insulating part 2332 can be formed separately and connected by assembly processes such as bonding or welding.

[0280] For example, when the inner insulation part 2331 and the outer insulation part 2332 are integral parts, and the inner insulation part 2331 and the outer insulation part 2332 are connected through the interruption 2213 or the through hole 2215, the insulation part can be obtained by integral injection molding. For example, insulating material is injected on the outside of the clamping structure 22. A portion of the insulating material can enter between the clamping structure 22 and the pole post 21 through the interruption 2213 or the through hole 2215 to form the inner insulation part 2331, and the rest remains outside the clamping structure 22 to form the outer insulation part 2332.

[0281] In some embodiments of this application, when the first clamping member 221 is disposed on the side of the second clamping member 222 away from the electrode component 3, as shown in FIG21, the insulating sealing structure 23 may include an insulating member 233, the insulating member 233 including an outer insulating portion 2332, at least a portion of the outer insulating portion 2332 being externally wrapped around the first clamping member 221, that is, externally wrapped around the side of the first clamping member 221 away from the clamping groove 223. In this case, the insulating member 233 may include the aforementioned inner insulating portion 2331, or may not include the aforementioned inner insulating portion 2331.

[0282] Therefore, by providing an outer insulating portion 2332 surrounding the clamping structure 22, short-circuit electrical connections between the current collector and the clamping structure 22 can be isolated, achieving an insulation effect between the current collector and the clamping structure 22, thereby improving the reliability of the battery device 100. Furthermore, the outer insulating portion 2332 can also have a leveling effect, filling in any wrinkles or stacking areas of the first clamping member 221, thus providing a more reliable insulation effect between the clamping structure 22 and the current collector.

[0283] In some embodiments of this application, as shown in Figures 22 and 24, the surface of the outer insulating portion 2332 away from the electrode component 3 (i.e., the outer surface of the outer insulating portion 2332) is lower than or flush with the surface of the pole post 21 away from the electrode component 3 (i.e., the outer surface of the pole post 21). That is, the outer surface of the outer insulating portion 2332 does not protrude from the outer surface of the pole post 21 in a direction away from the electrode component 3. For example, the outer surface of the outer insulating portion 2332 may be flush with the outer surface of the pole post 21; or, for example, at least a portion of the outer surface of the outer insulating portion 2332 protrudes from the outer surface of the pole post 21 in a direction away from the electrode component 3.

[0284] Therefore, although at least a portion of the outer insulation portion 2332 is wrapped around the first clamping member 221, the side surface of the outer insulation portion 2332 away from the electrode component 3 (i.e., the outer surface of the outer insulation portion 2332) does not protrude from the side surface of the pole post 21 away from the electrode component 3 (i.e., the outer surface of the pole post 21) in the direction away from the electrode component 3. As a result, the outer insulation portion 2332 wrapped around the first clamping member 221 will not partially lift the busbar component connected to the pole post 21, thereby improving the connection reliability and connection stability between the busbar component and the pole post 21.

[0285] For example, when the busbar and the terminal 21 are connected by welding, if the outer surface of the outer insulation portion 2332 is flush with the outer surface of the terminal 21, the outer insulation portion 2332 can support the welding nozzle, which is beneficial for the welding operation between the busbar and the terminal 21. That is, by controlling the thickness of the outer insulation portion 2332, the outer surface of the outer insulation portion 2332 can be made close to or flush with the outer surface of the terminal 21, so as to support the welding nozzle and facilitate the welding between the terminal 21 and the busbar.

[0286] In some embodiments of this application, as shown in FIG24, the outer insulation portion 2332 includes an embedded portion 23321 sandwiched between the outer peripheral surface of the pole post 21 and the inner peripheral surface of the first clamping member 221. Therefore, by providing the embedded portion 23321, the gripping force can be improved, the problem of the outer insulation portion 2332 being peeled off can be mitigated, the reliability and stability of the fit between the outer insulation portion 2332 and the clamping structure 22 can be enhanced, and the reliability of the insulation between the clamping structure 22 and the busbar component can be improved.

[0287] In some embodiments of this application, the outer insulation portion 2332 can fill the gap 2213. Thus, the outer insulation portion 2332 can achieve a more effective filling effect, not only filling the folds or stacked positions of the first clamping member 221, but also filling the missing pit positions of the first clamping member 221.

[0288] In some embodiments of this application, as shown in FIG25, the pole post component 2 further includes a reinforcing sheet 24. The reinforcing sheet 24 is disposed between the first clamping member 221 and the portion of the insulating sealing structure 23 clamped between the first clamping member 221 and the pole post 21, and is bent into a shape that matches the first clamping member 221. That is, the reinforcing sheet 24 can be processed into a shape that matches the clamping structure 22. As the first clamping member 221 bends, the first clamping member 221 bends synchronously, thereby simplifying assembly and processing. Here, the reinforcing sheet 24 refers to a sheet with a hardness greater than that of the insulating sealing structure 23, for example, the reinforcing sheet 24 can be a copper sheet, etc.

[0289] Therefore, by setting the reinforcing piece 24, the reinforcing piece 24 can play a role in structural reinforcement, improve the strength of the first clamping member 221, enable the clamping structure 22 to clamp the pole post 21 more reliably, and improve the sealing and insulation of the fit between the clamping structure 22 and the pole post 21.

[0290] In some embodiments of this application, referring to Figures 11-14, the first clamping member 221 is disposed on the side of the second clamping member 222 away from the electrode component 3. The first clamping member 221 and the second clamping member 222 are integrally formed parts. The first clamping member 221 is a riveted part, and the second clamping member 222 is a pre-formed part. The insulating sealing structure 23 includes a sealing member 231 and an insulating member 233. The sealing member 231 is a rubber part, and the insulating member 233 is a plastic part. The insulating member 233 includes an inner insulating part 2331 and an outer insulating part 2332. The sealing member 231 is clamped between the second clamping member 222 and the electrode post 21. The inner insulating part 2331 is clamped between the first clamping member 221 and the electrode post 21 and is injection molded on the electrode post 21. The outer insulating part 2332 is wrapped around the first clamping member 221.

[0291] When assembling the pole piece 2, first place the sealing member 231 between the pole piece 21 and the second clamping member 222, then press the pole piece down to a certain extent, and then rivet the first clamping member 221 inward and press it onto the inner insulating part 2331 that is injection molded on the pole piece 21. Then wrap the outer insulating part 2332 around the outside of the first clamping member 221 to form a complete seal.

[0292] Therefore, using the above-mentioned pole piece 2 is beneficial to improve the overall structural strength, eliminate the problems caused by insufficient strength, cracking of insulation 233, and small usable area on the outer surface of pole piece 21 when connecting the busbar component and pole piece 21 due to welding assembly of the first clamping member 221 and the second clamping member 222. Furthermore, by eliminating the laser welding of the first clamping member 221 and the second clamping member 222, the process can be simplified and process defects can be reduced.

[0293] In some embodiments of this application, as shown in Figures 22 and 26, Figure 26 is a cross-sectional view of the electrode post component provided in some embodiments of this application. The insulating sealing structure 23 includes an insulating support 232, at least a portion of which is disposed on the side of the clamping structure 22 near the electrode component 3. The electrode post 21 includes an inner protrusion 214 located in the inner ring region of the insulating support 232. The inner protrusion 214 protrudes relative to the clamping structure 22 toward the electrode component 3, and the surface S1 of the inner protrusion 214 near the electrode component 3 is flush with the surface S2 of the insulating support 232 near the electrode component 3. Thus, the electrode post 21 can be relatively close to the electrode component 3, facilitating the connection operation between the electrode component 3 and the electrode post 21.

[0294] In some embodiments of this application, as shown in Figures 21 and 27, Figure 27 is a cross-sectional view of an electrode post component provided in some embodiments of this application. The electrode post component 2 defines a receiving groove 25 recessed in a direction away from the electrode component 3. The electrode post 21 defines a groove end wall 215 on the side of the receiving groove 25 away from the electrode component 3. The electrode component 3 is electrically connected to the electrode post 21 via a conductive part 4. At least a portion of the conductive part 4 is received in the receiving groove 25 and connected to the groove end wall 215.

[0295] Therefore, since at least part of the conductive part 4 is housed in the receiving groove 25 defined by the electrode post 2, the space occupied by the conductive part 4 in the housing 1 can be reduced, so that more space can be saved in the housing 1 to accommodate the electrode component 3, electrolyte or gas generation, etc., thereby improving the energy density or reliability of the battery cell 102.

[0296] In some embodiments of this application, referring to Figures 11-14, 20, and 21, when assembling the battery cell 102, the electrode components 2 are assembled first. As shown in Figure 11, after the composite material electrode post 21 is fabricated, as shown in Figure 12, the edge of the electrode post 21 is coated with adhesive (i.e., the inner insulating part 2331 is injection molded). Then, the coated electrode post 21, together with the sealing member 231 and the insulating bracket 232, is mounted onto the clamping structure 22. After that, the first clamping member 221 is riveted. Then, as shown in Figure 13, the clamping structure 22 is coated with adhesive (i.e., the outer insulating part 233 is injection molded). 2); On the other hand, the tabs of the electrode component 3 are ultrasonically welded into a plate-shaped tab 33. Then, the tab 33 is passed from the inside to the outside through the mounting hole 112 on the first shell wall 111 and inserted into the receiving groove 25 of the pole component 2 on the outside of the first shell wall 111. The tab 33 is then laser welded to the groove end wall 215. After that, the pole component 2 is rotated 90° from the outside of the shell 1 and placed on the mounting hole 112. Then, the pole component 2 is welded to the first shell wall 111 to seal the mounting hole 112. After that, helium testing can be performed to detect defective products.

[0297] Of course, this application is not limited to this. Alternatively, the electrode ear 33 can be welded to the electrode post 21 first, and then the electrode post component 2 can be passed through the mounting hole 112 to the outside of the housing 1. Then, the electrode post component 2 can be rotated 90° from the outside of the housing 1 to cover the mounting hole 112, and then the electrode post component 2 can be welded to the first housing wall 111 to achieve the sealing of the mounting hole 112.

[0298] To avoid wrinkles and material buildup after the first clamping member 221 is riveted, a pre-formed groove 2214 can be pre-formed on the first clamping member 221 before it bends. The pre-formed groove 2214 can be milled and is formed by a recess in the end of the first clamping member 221 away from the second clamping member 222 towards the second clamping member 222 (for example, referring to Figures 9 and 10). After the first clamping member 221 bends, the first clamping portion 2211 extends towards the central axis of the pole post 21, forming a clamping groove 223 between the first clamping member 221 and the second clamping member 222, thus clamping the pole post 21. After the first clamping member 221 bends, due to the deformation of the first clamping portion 2211, the pre-formed groove 2214 transforms into an intermittent opening 2213 between two adjacent first clamping portions 2211 (for example, as shown in Figures 7 and 8).

[0299] Referring to Figure 10, the first clamping member 221 is divided into two parts: a surrounding part 2212 and a first clamping part 2211. The surrounding part 2212 is a closed ring. The first clamping part 2211 is connected to the side of the surrounding part 2212 away from the second clamping member 222. There are multiple first clamping parts 2211 and they are arranged at intervals along the circumference of the surrounding part 2212. A pre-made groove 2214 is formed between each two adjacent first clamping parts 2211. The pre-made groove 2214 extends from the end of the surrounding part 2212 away from the second clamping member 222 and passes through in the direction away from the second clamping member 222.

[0300] Referring to Figures 10 and 28, before the first clamping member 221 is bent, the maximum height of the first clamping member 221 in the axial direction (i.e. the extension direction of the central axis L) of the pole post 21 is H4. After the first clamping member 221 is bent, the radius of the arc corresponding to that point of the first clamping member 221 is R1.

[0301] Referring to Figures 10, 28, and 29, before the first clamping member 221 is bent, the height of the surrounding portion 2212 in the axial direction of the pole post 21 (i.e., the extension direction of the central axis L) is H3 (that is, H3 is the minimum distance between the pre-made groove 2214 and the second clamping member 222 in the axial direction of the pole post 21). After the first clamping member 221 is bent, the radius of the arc corresponding to that point of the surrounding portion 2212 is R0.

[0302] Referring to Figures 10 and 28, before the first clamping member 221 bends, the width of the pre-formed groove 2214 at a distance H from the second clamping member 222 along the axial direction of the pole post 21 is W. After the first clamping member 221 bends, the radius of the arc corresponding to that point in the pre-formed groove 2214 is R. H3≤H≤H4, R0≤R≤R1.

[0303] For the racetrack-shaped pole post 21, after the first clamping member 221 is bent, the redundancy E is: E=(2πR0+2L)-(2πR+2L)=2π(R0-R)≈2π(H-H3);

[0304] If there are n precast slots 2214, then the width W of a single precast slot 2214 is: W=E / n=2π(H-H3) / n.

[0305] For example, referring to Figures 30 and 31, the area S of the laser weld N formed by welding the electrode post 21 and the electrode lug 33 is greater than or equal to 60 mm². 2 S = U2 × L1, that is, U2 × L1 ≥ 60 mm 2 Where L1 is the length of laser weld N, and U2 is the width of laser weld N.

[0306] The length of the inner contour of the press-fit fixture 6 used for welding the pole post 21 and the pole lug 33 is L2, and the width of the inner contour of the press-fit fixture 6 is U3. Based on the operation requirements, 3mm≤L2-L1≤5mm, 3mm≤U3-U2≤5mm.

[0307] The ultrasonic weld mark M obtained by ultrasonic welding of the multi-layer electrode tabs in electrode tab 33 has a length greater than or equal to L2 and a width greater than or equal to U3. A standard welding head is used, with a length of 22mm and a width of 8mm, and weld marks are spliced ​​together.

[0308] Therefore, 22Y / 8X≈L2 / U3, where X and Y are both positive integers.

[0309] The length L of the straight edge of the exposed part of the inner surface of the racetrack-shaped pole post 21 is similar to the length L2 of the inner contour of the press-fit fixture 6, for example, it can differ by about 2mm; the arc diameter 2R2 of the exposed part of the inner surface of the racetrack-shaped pole post 21 is greater than or equal to the width U3 of the inner contour of the press-fit fixture 6, and a margin of 0.5mm can be reserved on one side.

[0310] Therefore, 22Y / 8X≈(L±2mm) / (2R2-1mm).

[0311] In addition, the length (22Y) of the ultrasonic weld mark M is less than or equal to the width of the tab L3 minus the misalignment amount 2e, where e is the misalignment amount on one side.

[0312] Therefore, 22Y≤L3-2e, where e is generally taken as 8mm.

[0313] To meet the requirement that the tab 33 passes through the mounting hole 112, the length of the mounting hole 112 is greater than or equal to the tab width L3 plus the misalignment 2e. The length of the mounting hole 112 is close to the total length (2R3+L) of the clamping structure 22. The outer contour of the clamping structure 22 is racetrack-shaped, where L is the length of the straight side of the racetrack-shaped outer contour of the clamping structure 22, and R3 is the radius of the arc at both ends of the racetrack-shaped outer contour of the clamping structure 22.

[0314] Therefore, 2R³ + L ≥ L³ + 2e, where e is generally taken as 8 mm.

[0315] Based on the above formula, the range of values ​​for the radius R3 of the arcs at both ends of the racetrack-shaped clamping structure 22 can be obtained.

[0316] In the embodiments of this application, the length of the adapter body 2222 can be limited to 1mm≤R3-R0≤2mm, so that the length of the adapter body 2222 will not be too long, which can improve the structural reliability of the clamping structure 22 and the connection reliability between the clamping structure 22 and the housing 1, and also ensure that the length of the adapter body 2222 is not too short, thereby facilitating the connection operation between the clamping structure 22 and the housing 1.

[0317] Therefore, based on the above-mentioned related design, the dimensions of the prefabricated groove 2214 can be designed to ensure that after the first clamping member 221 is bent, an interruption 2213 can be formed between two adjacent first clamping parts 2211.

[0318] In some embodiments of this application, as shown in FIG3, the battery cell 102 further includes a pressure relief device 5, which is disposed on the housing 1 and located on the same side as the terminal post component 2. Alternatively, in other embodiments of this application, the pressure relief device 5 and the terminal post component 2 may be located on opposite sides.

[0319] For example, the housing 1 can be surrounded by multiple walls facing different directions, one of which is a first housing wall 111, on which one or more pole members 2 can be disposed. When the pressure relief device 5 is also disposed on the first housing wall 111, the pressure relief device 5 and the pole member 2 are located on the same side; while when the pressure relief device 5 is disposed on other walls besides the first housing wall 111, the pressure relief device 5 and the pole member 2 are located on opposite sides.

[0320] For example, the pressure relief device 5 can be an explosion-proof valve installed on the housing 1, or it can be integrally formed on the thinned area of ​​the housing 1. Thus, by providing the pressure relief device 5, when the pressure inside the housing 1 exceeds a preset value, the pressure can be directionally released through the pressure relief device 5, thereby improving the reliability of the battery cell 102.

[0321] For example, the pressure relief device 5 and the terminal component 2 are located on the same side. Since the terminal component 2 is located on the first shell wall 111, when the pressure relief device 5 is also located on the first shell wall 111, the pressure relief device 5 and the terminal component 2 are located on the same side, for example, both can be located on the top of the battery cell 102, or both can be located on the bottom of the battery cell 102, or both can be located on the same side of the battery cell 102. This simplifies the design of the other shell walls besides the first shell wall 111, and simplifies the structure and processing of the battery cell 102. The shell 1 can be formed by multiple non-coplanar walls. For example, a cuboid shell 1 is formed by six walls, one of which is the first shell wall 111. By placing the pressure relief device 5 and the terminal component 2 on the same wall, they are located on the same side.

[0322] For example, the pressure relief device 5 and the pole member 2 are located on opposite sides. Since the pole member 2 is located on the first shell wall 111, when the pressure relief device 5 is located on a wall of the housing 1 other than the first shell wall 111, for example, the end of the shell body opposite the opening is the first shell wall 111, and the side wall of the shell body adjacent to the opening is the second shell wall, the pressure relief device 5 is located on the second shell wall, or the pressure relief device 5 is located on the shell cover, then the pressure relief device 5 and the pole member 2 are located on opposite sides. Therefore, there is no need to consider the space occupied by the pressure relief device 5 in the first shell wall 111, thus reducing the volume of the pole member 2, and the shape and area of ​​the pole member 2 can be flexibly designed as needed. The housing 1 can be surrounded by multiple non-coplanar walls. For example, a cuboid housing 1 is surrounded by six walls, one of which is the first shell wall 111. The pressure relief device 5 is located on any other wall other than the first shell wall 111, and the pole member 2 is located on the first shell wall 111, then the two are located on opposite sides.

[0323] According to a second aspect of this application, this application also provides a battery device 100, including a battery cell 102 from any of the above-described embodiments. It is worth noting that the battery device 100 according to this application may or may not include a housing 101. Therefore, since the reliability of the battery cell 102 according to this application is improved, it is beneficial to improve the performance of the battery device 100.

[0324] For example, the battery device 100 further includes a busbar, and at least two of the battery cells 102 are electrically connected through the busbar. This allows for the series and / or parallel connection of multiple battery cells 102. For instance, when multiple battery cells 102 are connected in series, the negative terminal 2 of one battery cell 102 is connected to the positive terminal 2 of the next battery cell 102 through a busbar, while the positive terminal 2 of the same battery cell 102 is connected to the negative terminal 2 of the previous battery cell 102 through another busbar.

[0325] For example, referring to FIG2, the battery device 100 includes a housing 101, multiple battery cells 102 are housed in the housing 101, and the bottom of the housing 101 is a housing bottom plate 1013. The terminal post 2 is disposed on the side of the housing 1 near the housing bottom plate 1013, or on the side of the housing 1 away from the housing bottom plate 1013.

[0326] During the use of the battery device 100, such as in vehicle use, the bottom plate 1013 of the housing is located at the bottom of the housing 101 in the direction of gravity. Thus, when the terminal post 2 is located on the side of the housing 1 near the bottom plate 1013, it means that the terminal post 2 is located at the bottom of the housing 1 in the direction of gravity; and when the terminal post 2 is located on the side of the housing 1 away from the bottom plate 1013, it means that the terminal post 2 is located at the top of the housing 1 in the direction of gravity. Therefore, the relative position of the terminal post 2 and the bottom plate 1013 is not limited, and the orientation of the battery cell 102 and the housing 101 can be flexibly arranged.

[0327] Specifically, when the terminal component 2 of the battery cell 102 is located on the side of the housing 1 facing the bottom plate 1013 of the box, the battery cell 102 is in an inverted state, and the depressurized products are ejected in the direction away from the passenger compartment, which is safer; when the terminal component 2 of the battery cell 102 is located on the side of the housing 1 away from the bottom plate 1013 of the box, the battery cell 102 is in an upright state, and the electrolyte is not easy to leak.

[0328] According to a third aspect of this application, this application also provides an electrical device including a battery device 100 of any of the above-described embodiments, the battery device 100 being used to provide electrical energy to the electrical device. The electrical device can be any of the aforementioned devices or systems using the battery device 100. Because the performance of the battery device 100 is improved, it is beneficial to improve the power consumption performance of the electrical device.

[0329] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0330] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell, wherein, The system includes a housing, an electrode component, and a terminal post component. The electrode component is disposed within the housing. The housing includes a first housing wall. The terminal post component is disposed within the first housing wall and includes: The electrode post is connected to the electrode component; A clamping structure is connected to the first shell wall. The clamping structure surrounds the pole post and is insulated from and sealed to the pole post through an insulating and sealing structure. The clamping structure includes a first clamping member and a second clamping member connected together. The first clamping member is bent toward the pole post and forms a clamping groove with the second clamping member to clamp the pole post together. The first clamping member includes a first clamping portion that bends toward the pole post. There are multiple first clamping portions arranged circumferentially along the pole post, and at least two adjacent first clamping portions form an interruption.

2. The battery cell according to claim 1, wherein, A plurality of first clamping portions are arranged at circumferential intervals along the pole post, such that a discontinuity is formed between each pair of adjacent first clamping portions, the discontinuities being a plurality of such discontinuities arranged at circumferential intervals along the pole post.

3. The battery cell according to claim 2, wherein, The pole post has a circular structure, and multiple discontinuities are evenly spaced along the circumference of the pole post.

4. The battery cell according to claim 2, wherein, The pole post has a long strip-shaped structure, and the first clamping part is distributed at both ends of the length and both sides of the width of the pole post.

5. The battery cell according to claim 4, wherein, The pole is a racetrack-shaped structure, which consists of a rectangle and two arcs located at both ends of the length of the rectangle. The discontinuity is arranged corresponding to the connection position of the rectangle and the arcs.

6. The battery cell according to any one of claims 1 to 5, wherein, The end of the discontinuity near the connection between the first clamping member and the second clamping member is a closed end, and the end of the discontinuity that passes through the first clamping member and is away from the connection position is an open end. The width of the discontinuity at the open end is greater than the width of the discontinuity at the closed end.

7. The battery cell according to claim 6, wherein, The width of the interruption gradually increases along the direction from the closed end to the open end.

8. The battery cell according to any one of claims 1 to 5, wherein, The first clamping member includes a surrounding portion connected between the first clamping portion and the second clamping member. The surrounding portion extends along the inner and outer directions of the first shell wall and extends around the entire circumference of the pole post. The first clamping portion and the surrounding portion are integral parts, and the first clamping portion bends and extends relative to the surrounding portion toward the central axis of the pole post. The discontinuity extends from the connection point of the surrounding portion and the first clamping portion toward the direction away from the surrounding portion to penetrate the first clamping member.

9. The battery cell according to any one of claims 1 to 5, wherein, The first clamping part has reinforcing ribs that protrude in a direction away from the pole post.

10. The battery cell according to claim 9, wherein, Along the direction of the first clamping member surrounding the pole post, the reinforcing rib is located at the center of the first clamping portion, and the reinforcing rib extends along the bending trajectory of the first clamping portion.

11. The battery cell according to any one of claims 1 to 10, wherein, The first clamping member and the second clamping member are a single piece.

12. The battery cell according to claim 11, wherein, The second clamping member is a pre-formed part and is connected to the first shell wall, while the first clamping member is a riveted part.

13. The battery cell according to claim 12, wherein, The second clamping member includes a second clamping portion, which cooperates with the first clamping portion to define the clamping groove. The second clamping portion has a stepped structure that protrudes in a direction away from the first clamping portion.

14. The battery cell according to any one of claims 1 to 13, wherein, The clamping structure includes a transition body, which is integral with at least one of the first clamping member and the second clamping member, and the transition body is integral with the first shell wall.

15. The battery cell according to any one of claims 1 to 13, wherein, The clamping structure includes a transfer body, which is integral with at least one of the first clamping member and the second clamping member, and the transfer body is assembled and connected to the first shell wall.

16. The battery cell according to any one of claims 1 to 15, wherein, The first clamping member is disposed on the side of the second clamping member away from the electrode component; The insulating and sealing structure includes: A seal, at least a portion of which is clamped between the pole and the second clamping member.

17. The battery cell according to claim 16, wherein, The second clamping member includes a second clamping portion that cooperates with the first clamping portion to form the clamping groove. The second clamping portion includes an end portion and a root portion. The end portion is disposed away from the first shell wall relative to the root portion. At least a portion of the seal is clamped between the root portion and the pole post.

18. The battery cell according to claim 17, wherein, The seal is also held between the end and the pole.

19. The battery cell according to claim 17 or 18, wherein, The seal is also clamped between the first clamp and the pole post, such that at least a portion of the seal is located between the connection point of the first clamp and the second clamp and the pole post.

20. The battery cell according to any one of claims 16 to 19, wherein, The sealing element is a single piece and also includes a portion clamped between the first clamping part and the pole post.

21. The battery cell according to claim 1, wherein, One of the first clamping member and the second clamping member is a preformed part, and the other is a riveted preformed part. The preformed part is connected to the first shell wall. The insulating and sealing structure includes: A seal, at least a portion of which is clamped between the pole and the preform.

22. The battery cell according to any one of claims 1 to 21, wherein, The first clamping member is disposed on the side of the second clamping member away from the electrode component; The insulating and sealing structure includes: An insulating support, at least a portion of which is disposed on the side of the second clamping member away from the first clamping member.

23. The battery cell according to claim 22, wherein, The clamping structure is integral with the first shell wall, and the insulating support is integral and also includes a first extension extending to the inner side of the first shell wall.

24. The battery cell according to claim 22, wherein, The clamping structure and the first shell wall are separate parts, while the insulating support is an integral part and also includes a second extension that extends between the second clamping member and the pole post.

25. The battery cell according to claim 17, wherein, The insulating sealing structure includes an insulating support, which is an integral piece and includes a portion disposed on the side of the second clamping member away from the first clamping member, and a second extension extending between the second clamping member and the pole post. The second extension is clamped between the end and the pole post, and has a gap between it and the portion of the sealing member clamped between the root and the pole post.

26. The battery cell according to any one of claims 1 to 15, wherein, The first clamping member is disposed on the side of the second clamping member away from the electrode component; The insulating and sealing structure includes: An insulating element, the insulating element including an inner insulating portion, at least a portion of the inner insulating portion being clamped between the pole and the first clamping element.

27. The battery cell according to claim 26, wherein, The insulating sealing structure further includes a sealing element, at least a portion of which is clamped between the pole post and the second clamping element, wherein the hardness of the insulating element is greater than the hardness of the sealing element.

28. The battery cell according to claim 27, wherein, The sealing element and the inner insulation part are separate parts, and there is a gap between the sealing element and the inner insulation part.

29. The battery cell according to any one of claims 26 to 28, wherein, The inner insulation portion is injection molded onto the pole post.

30. The battery cell according to claim 26, wherein, The insulating component also includes: An outer insulating portion, at least a portion of which is wrapped around the first clamping member.

31. The battery cell according to claim 30, wherein, The inner insulating part is connected to the outer insulating part.

32. The battery cell according to claim 31, wherein, The inner insulation portion and the outer insulation portion are connected through the break; And / or, the first clamping member has a through hole, and the inner insulating part is connected to the outer insulating part through the through hole.

33. The battery cell according to claim 31 or 32, wherein, The inner insulation part and the outer insulation part are integral parts, or the inner insulation part and the outer insulation part are separately formed and assembled.

34. The battery cell according to any one of claims 1 to 25, wherein, The first clamping member is disposed on the side of the second clamping member away from the electrode component; The insulating and sealing structure includes: An insulating component, the insulating component including an outer insulating portion, at least a portion of the outer insulating portion being externally wrapped around the first clamping component.

35. The battery cell according to claim 34, wherein, The surface of the outer insulation portion away from the electrode component is lower than or flush with the surface of the pole away from the electrode component.

36. The battery cell according to claim 34 or 35, wherein, The outer insulation portion includes an embedded portion sandwiched between the outer peripheral surface of the pole post and the inner peripheral surface of the first clamping member.

37. The battery cell according to any one of claims 34 to 36, wherein, The outer insulation portion also fills the gap.

38. The battery cell according to any one of claims 1 to 37, wherein, The pole component further includes a reinforcing plate, which is disposed between the first clamping member and the portion of the insulating sealing structure sandwiched between the first clamping member and the pole, and is bent into a shape that matches the first clamping member.

39. The battery cell according to any one of claims 1 to 38, wherein, The electrode post includes a first metal part and a second metal part made of different materials. The first metal part is located on the side of the second metal part away from the electrode component. The second metal part is connected to the electrode component. The outer periphery of the first metal part and the outer periphery of the second metal part adjacent to the first metal part are covered with a protective metal layer.

40. The battery cell according to any one of claims 1 to 38, wherein, The insulating and sealing structure includes: An insulating support, at least a portion of which is disposed on the side of the clamping structure near the electrode component, the pole post including an inner protrusion located in the inner ring region of the insulating support, the inner protrusion protruding relative to the clamping structure toward the electrode component, the surface of the inner protrusion near the electrode component being flush with the surface of the insulating support near the electrode component.

41. The battery cell according to any one of claims 1 to 38, wherein, The electrode post defines a recessed receiving groove in a direction away from the electrode post, the electrode post defining a groove end wall on the side of the receiving groove away from the electrode post, the electrode post being electrically connected to the electrode post via a conductive portion, at least a portion of the conductive portion being received in the receiving groove and connected to the groove end wall.

42. The battery cell according to any one of claims 1-41, wherein, It also includes a pressure relief device, which is located on the housing and on the same side or opposite side as the pole member.

43. A battery device, wherein, Includes the battery cell according to any one of claims 1-42.

44. The battery device according to claim 43, wherein, The battery device includes a housing, and multiple battery cells are housed within the housing. The bottom of the housing is a bottom plate, and the terminal post is located on the side of the housing near the bottom plate or on the side of the housing away from the bottom plate.

45. An electrical appliance, wherein, Includes the battery device according to claim 43 or 44.

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