Battery cell and processing method therefor, battery, and electric device

Abstract

A battery cell (102) and a processing method therefor, a battery (100), and an electric device (1000), relating to the technical field of batteries. The battery cell (102) comprises a casing component (1), a pole component (2), and a cell component (3). The casing component (1) is provided with an accommodating cavity (13) and comprises a first casing wall (111) which participates in defining the accommodating cavity (13). The pole component (2) is mounted on the first casing wall (111), and the pole component (2) comprises a pole body (21). The cell component (3) comprises cell bodies (32) and an adapter (35). The cell bodies (32) are arranged in the accommodating cavity (13), and the ends of the cell bodies (3) are connected to a tab group (33). The tab group (33) is electrically connected to the pole body (21) by means of the adapter (35). The adapter (35) supports a free end (331) of the tab group (33).

Description

Battery cells and their processing methods, batteries and electrical devices Technical Field

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

[0002] In recent years, new energy vehicles have made leaps and bounds in development. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role.

[0003] In related technologies, power batteries include battery cells, which, as the core of new energy vehicles, have high requirements in terms of reliability.

[0004] Summary of the Invention

[0005] This application provides a battery cell and its processing method, a battery, and an electrical device, which can improve the reliability of the battery cell.

[0006] In a first aspect, embodiments of this application provide a battery cell, comprising: a housing component having a receiving cavity and including a first housing wall that participates in defining the receiving cavity; a terminal component mounted on the first housing wall and including a terminal body; and a cell component including a cell body and an adapter, wherein the cell body is disposed within the receiving cavity and has a tab assembly connected to its end, the tab assembly being electrically connected to the terminal body via the adapter, and the adapter supporting the free end of the tab assembly.

[0007] In the above technical solution, by setting the tab assembly to be electrically connected to the electrode post body through an adapter, and making the adapter support the free end of the tab assembly, the length of the tab assembly can be shortened and the redundancy of the tab assembly can be improved. This is beneficial to improving problems such as wrinkling, bending and breakage of the tab pieces. At the same time, the adapter's support for the free end helps to reduce the risk of short circuits caused by the free end of the tab assembly being inserted into the cell body or into the root position of the adjacent cell body, thereby improving the reliability of the battery cell.

[0008] In some embodiments, the electrode assembly includes a plurality of electrode tabs, which converge and connect at a position away from the cell body to form a first fold at the free end. At least a portion of the first fold is connected to a part of the adapter on a side away from the cell body.

[0009] In the above technical solution, by setting a first gathering part to connect with the adapter, and the first gathering part having a certain rigidity, it is easy to improve the connection reliability between the first gathering part and the adapter; and at least part of the first gathering part is connected to a part of the adapter on the side away from the main body of the battery cell, so that the above part of the adapter can support at least part of the first gathering part, and the multi-layer electrode tabs of the first gathering part are not easy to loosen, which can improve the support reliability of the adapter for the free end.

[0010] In some embodiments, the adapter includes a first connecting portion and a second connecting portion. The first connecting portion is connected to the pole post component, and the second connecting portion is connected to the first folding portion and supports the first folding portion. At least a portion of the orthographic projection of the first folding portion on the first shell wall is located within the orthographic projection range of the second connecting portion on the first shell wall, and the thickness of the second connecting portion is greater than or equal to the thickness of the first folding portion.

[0011] In the above technical solution, by setting the orthographic projection of the supported part of the first gathering part on the first shell wall to be within the orthographic projection range of the second connecting part, and the thickness of the second connecting part being greater than or equal to the thickness of the first gathering part, the cross-sectional area of ​​the second connecting part can be greater than or equal to the cross-sectional area of ​​the first gathering part. This is beneficial to reduce the resistance at the connection position between the second connecting part and the first gathering part, and improve the overcurrent capacity at the connection position between the second connecting part and the first gathering part, thereby facilitating the reduction of the internal resistance of the battery cell and the improvement of the overcurrent capacity of the battery cell.

[0012] In some embodiments, multiple tabs of the tab assembly converge near the cell body to form a second folded portion. One end of the second folded portion is bent and connected to the first folded portion, and the other end is connected to the cell body. The end face of the portion of the adapter connected to the first folded portion extends to the bent position near the second folded portion.

[0013] In the above technical solution, by setting one end of the second gathering part to be bent and connected to the first gathering part, the end face of the part of the adapter connected to the first gathering part extends to the bending position near the second gathering part, which makes it easier for the adapter to support the entire first gathering part and improve the reliability of the support for the free end; at the same time, since the multiple tabs of the tab group only converge and approach but do not connect when forming the second gathering part, the adapter can have a certain indirect pressure effect on the bending position of the second gathering part, which makes it easier to improve the tightness of the second gathering part, so that the second gathering part maintains the preset converged shape and cannot be dispersed, which helps to reduce the risk of the second gathering part being inserted upside down into the battery cell body.

[0014] In some embodiments, the tab assembly is bent to form a first opening groove, the free end defining at least a portion of the groove wall on one side of the first opening groove near the pole body, and the adapter extends into the first opening groove and abuts against the free end.

[0015] In the above technical solution, by setting the adapter to extend into the first opening groove formed by the bending of the tab assembly and abut against the free end, the reliability of the adapter in supporting the free end can be improved. At the same time, the bent tab assembly can play a buffering role. When using the battery cell in a vibration environment, it can reduce the impact of the cell body towards the first shell wall, thus protecting the cell components and improving the reliability of the battery cell.

[0016] In some embodiments, the adapter is bent to form a second opening slot adjacent to the first opening slot and located on the side of the first opening slot facing the pole body, and the opening orientations of the second opening slot and the first opening slot are arranged at an angle.

[0017] In the above technical solution, the conductive part composed of the tab assembly and the adapter can exhibit a serpentine, reciprocating bending shape. This conductive part acts as a buffer, reducing the impact of the active material coating on the first casing wall when the battery cell is used in a vibration environment, thus protecting the cell components and improving the reliability of the battery cell. Furthermore, because the conductive part does not extend irregularly, it reduces interference and friction between the tabs within the conductive part, as well as the risk of the tabs being inserted backwards into the cell body, further enhancing the reliability of the battery cell.

[0018] In some embodiments, the end of the adapter furthest from the pole body has a clamping structure that supports the free end and includes two opposing clamping portions. The free end is clamped between the two clamping portions and connected to each clamping portion.

[0019] In the above technical solution, by clamping the free end between two clamping parts, the two clamping parts can limit the free end of the electrode assembly, which helps to improve the connection reliability of the multiple electrode tabs at the free end. Simultaneously, one of the clamping parts, located adjacent to the cell body, can support the free end of the electrode assembly on the side of the free end facing away from the electrode post body, preventing the free end of the electrode assembly from moving towards the cell body and reducing the risk of reverse insertion. Furthermore, the two clamping parts can protect the free end, reducing the risk of cracking due to the thinness of the electrode tabs at the free end, which helps to improve the welding quality between the electrode assembly and the adapter plate, and enhances the connection reliability between the electrode assembly and the adapter plate.

[0020] In some embodiments, the adapter includes a first connecting portion, a bending portion, and a second connecting portion, the first connecting portion and the second connecting portion being opposite to each other, the bending portion being bent between the first connecting portion and the second connecting portion, the first connecting portion being connected to the pole body, and the second connecting portion supporting the free end.

[0021] In the above technical solution, the second connecting part supports the free end of the electrode assembly, which can improve the redundancy of the electrode assembly and reduce the risk of short circuit caused by the electrode assembly being inserted into the main body of the battery cell. Moreover, the bent adapter can play a buffer support role while ensuring reliable support for the free end of the electrode assembly, which helps to reduce the risk of the battery cell component hitting the casing component and improve the reliability of the battery cell.

[0022] In some embodiments, the thickness of the bent portion is less than the thickness of at least one of the first connecting portion and the second connecting portion; and / or, in the extending direction of the central axis of the bent portion, the width of the bent portion is less than the width of at least one of the first connecting portion and the second connecting portion.

[0023] In the above technical solution, by setting the thickness of the bending portion to be less than the thickness of at least one of the first connecting portion and the second connecting portion, and the width of the bending portion to be less than the width of at least one of the first connecting portion and the second connecting portion, the material reduction in thickness and width of the bending portion is achieved, so that the first connecting portion and the second connecting portion have a certain rigidity, thus realizing a reliable connection between the adapter and the electrode body, and a reliable connection between the adapter and the electrode lug. At the same time, the bending portion is weakened, making it easier for the adapter to bend at the bending position. Especially for cases where the adapter's structure is roughly plate-shaped before assembly and has a bending position after assembly, the adapter can achieve a soft connection between the electrode body and the cell body, making it easier for the adapter to bend smoothly at the bending position during assembly, thus improving assembly convenience.

[0024] In some embodiments, the adapter includes a plurality of adapter foils, which are stacked and connected in a manner that forms a first connecting portion and a second connecting portion spaced apart. The first connecting portion is connected to the pole body, and the second connecting portion is connected to the free end.

[0025] In the above technical solution, by setting the adapter to include multiple stacked adapter foils, the number of adapter foils and the structure and size of each adapter foil can be flexibly set, so that the adapter has a flexible structure and size design, which improves the applicability and practicality of the adapter, helps to reduce the difficulty of connecting with the pole body and the pole lug assembly, and improves the ease of assembly. Furthermore, since multiple overlapping transition foils are connected to form spaced first and second connecting portions, the opposing surfaces of adjacent transition foils are connected, but not completely connected, which helps reduce the processing steps of the transition piece. Moreover, since the thickness of a single transition foil is relatively small compared to the thickness of the transition piece, multiple transition foils are equivalent to multiple thin plates. The transition piece formed by multiple transition foils is easier to bend than a one-piece molded transition piece. At the same time, the rigidity of some areas of the transition piece is relatively small, which makes it easier for the transition piece to bend in the areas with lower rigidity during the assembly of the battery cell. Thus, the above-mentioned transition piece setting facilitates the soft connection between the tab assembly and the terminal block body, so that the transition piece can be bent into a certain shape during the assembly of the battery cell, thereby meeting the design requirements.

[0026] In some embodiments, the portion of the adapter between the first connecting portion and the second connecting portion forms a third connecting portion, which is bent to connect the first connecting portion and the second connecting portion.

[0027] In the above technical solution, in the portion corresponding to the third connecting part of the multiple connecting foils of the adapter, two adjacent connecting foils may not be connected. Therefore, the stiffness of the third connecting part is less than that of the first and second connecting parts, facilitating bending at the third connecting part. This improves assembly convenience when the structural shape of the adapter changes during assembly, for example, the third connecting part is not bent before assembly but is bent after assembly. Furthermore, the bent adapter can provide buffer support while reliably supporting the free end of the electrode assembly, reducing the risk of cell components impacting the casing components and improving the reliability of the battery cells.

[0028] In some embodiments, the plurality of adapter foils include at least one first adapter foil and at least one second adapter foil, wherein the first adapter foil and the second adapter foil are respectively connected to both sides of the thickness of the free end.

[0029] In the above technical solution, by setting the first and second adapter foils to be connected to both sides of the thickness of the free end, the free end can be separated from the pressurizing device by the first and second adapter foils, so as to protect the free end, reduce the risk of the tabs of the tab assembly cracking due to their thinness, and improve the welding quality between the tab assembly and the adapter, thereby improving the connection reliability between the tab assembly and the adapter.

[0030] In some embodiments, a plurality of battery cell bodies arranged sequentially along a second direction constitute a battery cell group. All free ends of the battery cell group extend toward the middle position of the battery cell group in the second direction and are connected to form a first folded portion, and the adapter supports the first folded portion.

[0031] In the above technical solution, by setting multiple cell bodies to form a cell group, it is beneficial to improve the voltage and capacity of the battery cells. All the free ends of the cell group extend towards the middle position of the cell group in the second direction, which can reduce the offset of the closing position of the electrode group of the cell group relative to the center of the cell group A in the first direction shown in the figure. Since the larger the offset, the longer the required length of the electrode group, the above arrangement can reduce the length of the electrode group, improve the redundancy of the electrode group, and reduce the risk of reverse insertion. Moreover, the adapter can support the first closing part formed by connecting all the free ends of the cell group, which facilitates the electrical connection between all the cell bodies of the cell group and the electrode body, and helps to reduce the number of adapters and simplify the structure of the battery cells.

[0032] In some embodiments, in the second direction, the midpoint of the cell assembly in the second direction is taken as the midpoint of the central position, and the size of the central position is less than or equal to 1 / 2 of the size of a cell body.

[0033] In the above technical solution, the middle position is not the absolute midpoint. The middle position is a small area formed around the midpoint. This setting can reduce the length of the tab assembly while taking into account different assembly and usage requirements. It is beneficial to reduce assembly requirements and improve the applicability and practicality of the battery cell.

[0034] In some embodiments, the battery cells are multiple groups arranged sequentially along a second direction, and the adapter supports all the first retractable portions.

[0035] In the above technical solution, by setting up multiple sets of battery cells, it is beneficial to further improve the voltage and capacity of the battery cells. The adapter supports the first convergence part of all battery cells, which facilitates the electrical connection between all the main bodies of the battery cells and the terminal body. It also helps to further reduce the number of adapters and simplify the structure of the battery cells.

[0036] In some embodiments, the adapter includes a main structure and a plurality of branch structures. The main structure is connected to the pole body, and each branch structure is connected to the end of the main structure away from the pole body and includes at least one level of branch segment to construct the adapter into a fractal tree structure. Each last level of branch segment of the branch structure supports a first convergence portion.

[0037] In the above technical solution, by setting the adapter to construct a branched tree structure, it is easy for the adapter to realize the electrical connection between all the main body of the battery cell and the main body of the terminal post, and the adapter can connect a larger number of main bodies of the battery cell, while the space occupied by the adapter is relatively small.

[0038] In some embodiments, the adapter includes a first connecting portion, a bent portion, and a second connecting portion, the first connecting portion and the second connecting portion being opposite to each other, the bent portion being bent and connected between the first connecting portion and the second connecting portion, and at least a portion of the second connecting portion being configured as a plurality of branch structures.

[0039] In the above technical solution, by setting a bending part to bend between the first connecting part and the second connecting part, and constructing at least part of the second connecting part into multiple branch structures, the second connecting part supports all the tab groups, realizes the electrical connection between all the tab groups and the electrode post body, and the bent adapter can play a buffer support role while reliably supporting the free end of the tab group, which helps to reduce the risk of the cell component hitting the shell component and improve the reliability of the battery cell.

[0040] In some embodiments, the connection point between the main structure and the branch structure is located at the center of all cell groups in the first direction.

[0041] In the above technical solution, by setting the connection position between the main structure and the branch structure to be located in the middle of all cell groups in the first direction, it is convenient to shorten the length of the branch structure while ensuring that the branch structure can reliably support the electrode group, which helps to reduce the space occupied by the adapter.

[0042] In some embodiments, the number of battery cells in a battery cell group is an odd or even number; and / or, the number of battery cells in multiple battery cell groups is equal or unequal.

[0043] In the above technical solution, the design of the battery cell pack is flexible, which makes it easier to improve the applicability and practicality of the battery cells.

[0044] In some embodiments, the battery cell further includes: an insulating member disposed within a receiving cavity and having a perforation formed therein, the insulating member blocking the portion of the tab assembly and / or adapter that passes through the perforation to the side of the insulating member opposite to the cell body from the cell body.

[0045] In the above technical solution, the insulating component can be used to isolate the cell body from the first shell wall of the casing component, reducing the probability of contact between the cell body and the first shell wall of the casing component. This reduces the risk of corrosion of the first shell wall of the casing component due to leakage of the cell body, reduces the risk of cell body failure, and reduces the risk of leakage, thereby improving the reliability and stability of the battery cell. Moreover, the insulating component blocks the portion of the conductive part that passes through the insulating component to the side opposite to the cell body from the cell body, thus separating the portion of the conductive part that passes through the insulating component to the side opposite to the cell body from the cell body. This reduces the probability of the conductive part being inserted backwards into the cell body due to redundancy, thereby reducing the risk of short circuit in the battery cell and improving the reliability of the battery cell.

[0046] In some embodiments, the insulating component includes: an insulating film that fully covers the cell body, a perforation formed at a position of the insulating film opposite to the first shell wall, and a portion of the insulating film surrounding the perforation blocking the portion of the tab assembly that passes through the perforation to the side of the insulating film facing the electrode body and the cell body.

[0047] In the above technical solution, since the portion of the insulating film surrounding the perforation blocks the portion of the tab assembly that passes through the perforation to the side of the insulating film facing the electrode body and the cell body, it facilitates the adaptation of the size of the perforation on the insulating film to the size of the tab assembly. For example, the size of the first clearance hole is adapted to the thickness of the portion of the tab assembly located at the first clearance hole. On the one hand, the perforation allows the tab assembly to pass through smoothly to make electrical connection with the electrode body. On the other hand, it allows the insulating film to still cover the position of multiple tabs of the tab assembly near the root of the cell body when the tab assembly is inserted through the perforation, further providing insulation protection for the cell body and reducing the risk of the cell body being exposed. At the same time, it can separate the portion of the tab assembly that passes through the perforation from the cell body, reducing the probability of the tab assembly and / or adapter being redundant and thus inserted upside down into the cell body or near the root of the cell body, which is beneficial to further reduce the risk of short circuit in the battery cell.

[0048] In some embodiments, the insulating component includes: an insulating support disposed on the side of the cell body facing the first housing wall, a perforation being formed at the position of the insulating support opposite to the electrode component, and a portion of the insulating support surrounding the perforation blocking the connection between the adapter and the cell body.

[0049] In the above technical solution, since the part of the insulating bracket surrounding the perforation is blocked between the adapter and the cell body, the insulating bracket can provide a certain support for the adapter. The adapter supports the free end of the tab assembly, and the insulating bracket can insulate the free end of the tab assembly from the cell body, reducing the probability of the free end of the tab assembly being inserted into the cell body or into the root of the adjacent cell body, reducing the risk of short circuit and improving the reliability of the battery cell.

[0050] In some embodiments, the pole piece further includes a transition structure and an insulating structure, the transition structure surrounding the pole piece body and connected to the first shell wall, and the insulating structure insulatingly fitting between the transition structure and the pole piece body.

[0051] In the above technical solution, the pole component has a simple structure and is easy to process. Since it includes two parts, the pole body and the adapter structure, the shape and size of the pole body and the adapter structure can be designed separately based on different factors to flexibly adapt to the connection requirements of different types of housing components and battery cell components, thereby increasing the applicability of the pole component.

[0052] In some embodiments, the insulating structure includes a sealing structure member that is circumferentially disposed on the side of the transition structure facing the pole body and is at least partially sandwiched between the transition structure and the pole body in the inward and outward directions of the first housing wall.

[0053] In the above-mentioned technical solutions, at least a portion of the sealing structure is clamped between the transition structure and the pole body in the inner and outer directions of the first shell wall, thereby achieving an axial seal between the transition structure and the pole body. This axial seal provides a relatively reliable sealing effect and improves the leakage problem at the mating position of the transition structure and the pole body. Furthermore, the embodiments of this application integrate the axial seal into the pole component, reducing the axial force on the first shell wall. Moreover, by placing the sealing structure ring around the inner ring of the transition structure, the sealing structure can be close to the mating position of the transition structure and the pole body, facilitating a shorter path for sealing the mating position, improving sealing reliability, reducing the size of the sealing structure, decreasing the sealing area, making compression sealing easier, reducing seal failure, and improving the sealing effect.

[0054] In some embodiments, the electrode body includes a peripheral portion, the adapter structure is clamped on both sides of the peripheral portion in the inward and outward directions of the first shell wall by an insulating structure, and at least a portion of the sealing structure is clamped between the side of the peripheral portion facing the cell component and the adapter structure.

[0055] In the above technical solution, the electrode post component has a simple structure and is easy to process, enabling simple and effective fixation and insulating fit between the electrode post body and the adapter structure. The sealing structure is clamped between the peripheral portion of the electrode post body and the adapter structure, allowing the sealing structure to be positioned at the mating point between the adapter structure and the electrode post body. This facilitates sealing at the mating point via a shorter path, improving sealing reliability. Furthermore, it allows for a smaller sealing structure and a smaller sealing area, making compression sealing easier and reducing the likelihood of seal failure, thus enhancing the sealing effect. Moreover, since at least a portion of the sealing structure is clamped between the peripheral portion facing the cell component and the adapter structure, the sealing structure can seal from the peripheral portion facing the receiving cavity, more effectively suppressing electrolyte leakage from the mating point between the electrode post body and the adapter structure, thereby improving the sealing effect.

[0056] In some embodiments, the adapter structure includes a mating ring portion, the pole body includes a through portion passing through the mating ring portion, and an inner limiting portion and an outer limiting portion connected to the through portion and clamped on both sides of the mating ring portion, and at least a portion of the sealing structure is clamped between the mating ring portion and the inner limiting portion.

[0057] In the above technical solution, the electrode post component has a simple structure and is easy to process, enabling simple and effective fixation and insulating fit between the electrode post body and the adapter structure. The sealing structure is clamped at the mating position between the electrode post body and the mating ring, allowing the sealing structure to be positioned at the mating position between the adapter structure and the electrode post body. This facilitates sealing at the mating position of the adapter structure and the electrode post body via a shorter path, improving sealing reliability. Furthermore, it allows for a smaller size and sealing area of ​​the sealing structure, facilitating compression sealing, reducing the likelihood of seal failure, and enhancing the sealing effect. Moreover, since at least a portion of the sealing structure is clamped between the mating ring and the inner limiting part, the sealing structure can seal from the side of the mating ring facing the receiving cavity, more effectively suppressing electrolyte leakage from the mating position between the electrode post body and the adapter structure, thereby improving the sealing effect.

[0058] In some embodiments, the terminal member forms a receiving groove that is recessed relative to the first housing wall in a direction away from the cell member and open in a direction towards the cell member, and at least a portion of the adapter is received in the receiving groove.

[0059] In the above technical solution, by setting up a receiving groove to accommodate the adapter, the space occupied by the adapter in the receiving cavity can be reduced, allowing the receiving cavity to have a larger space to accommodate the main body of the battery cell. This is beneficial for increasing the volume of the main body of the battery cell, thereby increasing the energy density of the battery cell. Moreover, since the receiving groove is open towards the direction of the battery cell component, the adapter can be easily inserted into the receiving groove, reducing the difficulty of operation.

[0060] In some embodiments, the housing component includes a housing body and a housing cover. The housing body is an integral piece with one end open, and the housing cover is located at the open end of the housing body. The end of the housing body opposite to the housing cover is a first housing wall; or, the housing cover is the first housing wall.

[0061] In the above technical solution, the structural design of the housing component is flexible, and the setting position of the pole component is flexible.

[0062] In some embodiments, the battery cell further includes a pressure relief component disposed on the housing component and located on the same side or opposite side to the terminal component.

[0063] In the above technical solutions, when the pressure relief component and the terminal post component are located on the same side, the design of other shell walls besides the first shell wall can be simplified, thus simplifying the structure and processing of the battery cell. When the pressure relief component and the terminal post component are located on opposite sides, there is no need to consider the space occupied by the pressure relief component in the first shell wall, thereby reducing the volume of the terminal post component and allowing for flexible design of the shape and volume of the terminal post component as needed.

[0064] Secondly, this application provides a processing method for processing the aforementioned battery cell. The processing method includes: installing a cell component into a receiving cavity, and setting one end of the cell component with a tab assembly opposite to the first housing wall on the inner side of the first housing wall; installing a terminal post component on the first housing wall, and connecting the tab assembly to the terminal post body through an adapter, and having the adapter support the free end of the tab assembly.

[0065] In the above technical solution, by having the adapter support the free end of the tab assembly during the assembly process, the free end can be prevented from moving toward the main body of the cell, thereby reducing the risk of short circuit caused by the tab assembly moving toward the main body of the cell and being inserted into the main body of the cell in reverse, which is beneficial to improving the reliability of the battery cell.

[0066] In some embodiments, a mounting hole is formed in the first housing wall; the step of mounting the electrode post component to the first housing wall and connecting the electrode tab assembly to the electrode post body via an adapter, and having the adapter support the free end of the electrode tab assembly includes: connecting one end of the adapter to the electrode tab assembly and the other end passing through the mounting hole to the outside of the first housing wall and connecting to the electrode post body; covering the mounting hole from the inside or outside of the first housing wall with the electrode post component connected to the adapter; or, the step of mounting the electrode post component to the first housing wall and connecting the electrode tab assembly to the electrode post body via an adapter, and having the adapter support the free end of the electrode tab assembly to prevent the free end from moving toward the cell body includes: placing the cell component inside the first housing wall, connecting one end of the adapter to the electrode tab assembly and the other end to the electrode post body; and covering the mounting hole from the inside or outside of the first housing wall with the electrode post component connected to the adapter after passing through the mounting hole.

[0067] In the above technical solution, one end of the adapter is first connected to the tab assembly, and then the other end of the adapter is passed through the mounting hole to the outside of the first shell wall and connected to the terminal body. Since the adapter is not yet connected to the terminal component when it passes through the mounting hole, it is convenient for the adapter to pass through the mounting hole, improving operational convenience. Moreover, since the welding position between the terminal component and the adapter is located on the outside of the first shell wall, the problem of conductive debris formed during welding entering the interior of the shell and damaging the cell component can be mitigated. The adapter is connected to the terminal component first, and then the terminal component is installed on the first shell wall. Since the cell component and the terminal component are connected first, and then the terminal component is passed through the mounting hole, there is no need to consider avoiding the first shell wall when connecting the cell component 3 and the terminal component. In other words, when connecting the cell component and the terminal component, the terminal component and the cell component are not located on opposite sides of the first shell wall, which helps to further shorten the length of the conductive part, reduce the redundancy of the conductive part after assembly, reduce the risk of reverse insertion, and improve the reliability of the battery cell. Furthermore, since the welding points of the terminal post and the cell component are located on the outside of the housing, the problem of conductive debris generated during welding entering the housing and damaging the cell component can be mitigated. Additionally, because the terminal post is fitted over the mounting hole from the outside of the first housing wall, allowing the adapter structure to abut against the outside of the first housing wall and connect to it from the outside, the assembly and connection of the terminal post and the first housing wall are facilitated, thus improving the reliability of the connection between the terminal post and the first housing wall.

[0068] In some embodiments, the electrode assembly includes a plurality of electrode tabs; before connecting the electrode assembly to the adapter, the plurality of electrode tabs are brought together to form a stacked portion at the free end; the step of connecting one end of the adapter to the electrode assembly includes: connecting the plurality of electrode tabs of the electrode assembly at the stacked portion location to form a first folded portion, and connecting at least a portion of the first folded portion to the adapter; or, connecting at least a portion of the stacked portion to the adapter.

[0069] In the above technical solution, the laminated portion is pre-connected to form a first gathered portion with a certain rigidity, rather than a loose, multi-layered foil shape. This facilitates the connection between the first gathered portion and the adapter, and makes the welding of the electrode tab and the adapter more reliable. It also reduces the likelihood of voids forming in the weld, improving the connection reliability and conductivity at the weld joint, resulting in more stable and reliable conductivity between the cell component and the electrode component. Alternatively, the laminated portion can be directly connected to the adapter without pre-connection, simplifying the processing steps and improving efficiency. Connecting the laminated portion to the adapter simultaneously forms the first gathered portion, achieving a reliable connection between the laminated portion and the adapter.

[0070] In some embodiments, the end of the adapter away from the pole body has a clamping structure and includes two opposing clamping portions; the step of connecting one end of the adapter to the tab assembly includes: clamping the free end from both sides of the free end with the two clamping portions; and connecting both clamping portions to the free end.

[0071] In the above technical solution, the two clamping parts can protect the free end, thereby improving the problem of the free end being prone to cracking during the connection with the clamping structure and enhancing the connection reliability between the adapter and the tab assembly.

[0072] In some embodiments, the adapter includes a plurality of adapter foils; before connecting one end of the adapter to the tab assembly, the method further includes: stacking the plurality of adapter foils; connecting the stacked portions to form a first connection portion; the step of connecting one end of the adapter to the tab assembly and the other end to the pole body includes: connecting the stacked portions of the plurality of adapter foils to the free end, so that the stacked portions form a second connection portion spaced apart from the first connection portion; and connecting the first connection portion to the pole body.

[0073] In the above technical solution, the stacked portions are connected to form a first connecting part, so as to connect multiple adapter foils, improve the compaction of the adapter foils in the first connecting part, and facilitate the connection between the adapter and the pole component. "Connecting multiple adapter foils to the free end" and "connecting the stacked portions of multiple adapter foils to form a second connecting part" can be performed simultaneously, which helps to simplify the processing steps.

[0074] In some embodiments, in the step of covering the mounting hole from the inside or outside of the first housing wall with the pole member connected to the adapter, or covering the mounting hole from the inside or outside of the first housing wall after passing the pole member connected to the adapter through the mounting hole: when the pole member is installed on the first housing wall, the portion located between the first housing wall and the battery cell body after the tab assembly and the adapter are connected is bent.

[0075] In the above technical solution, the conductive part composed of the tab assembly and the adapter can play a buffering role. When the battery cell is used in a vibration environment, it can reduce the impact of the cell body towards the first shell wall, thus protecting the cell components and improving the reliability of the battery cell. In addition, the terminal component is installed before the first shell wall. After the tab assembly and the adapter are connected, the part located between the first shell wall and the cell body can be basically in an unfolded state. This facilitates the connection between the tab assembly and the adapter, and / or the connection between the adapter and the terminal body, and provides sufficient operating space. For example, it is convenient to lay the part of the adapter that connects to the terminal body on the terminal body for connection.

[0076] In some embodiments, the battery cell includes an insulating support located inside the first housing wall; the step of bending the portion between the first housing wall and the cell body after the tab assembly and the adapter are connected when the terminal post component is installed on the first housing wall includes: bending the portion between the first housing wall and the cell body after the tab assembly and the adapter are connected to form a first opening groove when the terminal post component is installed on the first housing wall, the free end defining at least a portion of the groove wall on the side of the first opening groove near the terminal post body; and inserting a portion of the insulating support into the first opening groove.

[0077] In the above technical solution, the insulating bracket can prevent the free end from moving toward the main body of the cell, which helps to further reduce the risk of short circuit caused by the tab group moving toward the main body of the cell and being inserted into the main body of the cell inverted, and helps to improve the reliability of the battery cell.

[0078] In some embodiments, the battery cell includes an insulating support located inside the first housing wall; the step of bending the portion between the first housing wall and the cell body after the tab assembly and the adapter are connected when the terminal post component is installed on the first housing wall includes: bending the portion between the first housing wall and the cell body after the tab assembly and the adapter are connected to form a first opening groove, and a second opening groove adjacent to the first opening groove and located on the side of the first opening groove facing the terminal post body, the opening orientations of the second opening groove and the first opening groove are arranged at an angle; a portion of the insulating support is inserted into the first opening groove and the second opening groove.

[0079] In the above technical solution, the insulating bracket can prevent the free end from moving toward the main body of the battery cell, and at the same time, the insulating bracket can also prevent the adapter from moving toward the main body of the battery cell, which helps to further reduce the risk of reverse insertion and improve reliability.

[0080] In some embodiments, the step of connecting the other end of the adapter to the electrode body includes: adjusting the angle of the electrode component so that the normal of the inner end face of the electrode body is close to the stacking direction of the multiple battery cells; and the step of covering the mounting hole with the electrode component connected to the adapter includes: adjusting the angle of the electrode component on the outside of the first shell wall so that the normal of the inner end face of the electrode body is close to the stacking direction perpendicular to the multiple battery cells, and the tab assembly is bent and deformed to form a first opening groove, the adapter is bent and deformed to form a second opening groove, and the openings of the first opening groove and the second opening groove are arranged at an angle.

[0081] In the above technical solution, by first adjusting the position and angle of the electrode component so that the normal of the inner end face of the electrode body is close to the stacking direction of multiple battery cell components, and then laying the part of the adapter that connects to the electrode body on the inner end face of the electrode body, there is no need to adjust the angle of the electrode body. This allows sufficient space near the mating position of the part of the adapter that connects to the electrode body and the inner end face of the electrode body for welding operations, thus simplifying the operation. Moreover, this allows for a shorter electrode tab length. When adjusting the angle of the electrode component to connect with the first shell wall, the conductive part can be bent to form the first opening groove and the second opening groove.

[0082] In some embodiments, the housing component includes a housing body and a housing cover, the housing body having an opening; when the end wall of the housing body opposite the opening is a first housing wall, the step of installing the battery cell component into the receiving cavity and disposing the battery cell component inside the first housing wall and opposite to the first housing wall includes: installing the battery cell component into the receiving cavity through the opening; extending the tab assembly from the mounting hole so that one end of the battery cell component with the tab assembly is disposed inside the first housing wall and opposite to the first housing wall; closing the housing cover to the opening; when the housing cover is the first housing wall, the step of installing the battery cell component into the receiving cavity and disposing one end of the battery cell component with the tab assembly is disposed inside the first housing wall and opposite to the first housing wall includes: supporting the battery cell component on the inside of the housing cover; extending the tab assembly from the mounting hole so that one end of the battery cell component with the tab assembly is disposed inside the first housing wall and opposite to the first housing wall; and fitting the housing body onto the outside of the battery cell component and connecting it to the housing cover.

[0083] In the above technical solution, by placing the terminal post component at the end opposite to the opening of the casing, it is beneficial to improve the cracking problem at the connection between the casing and the cover, and improve the reliability of the battery cell. By completing the connection between the casing and the cover first, and then connecting the terminal post component to the cover, the casing can be used to house the battery cell component and support the cover. This facilitates the positioning and support of the cover, making it easier to connect the cover to the adapter structure and improving the connection reliability between the cover and the terminal post component.

[0084] In some embodiments, when the end wall opposite the opening of the housing is the first housing wall, before inserting the cell component into the receiving cavity from the opening, the insulating film is wrapped around the outside of the cell body; when the housing cover is the first housing wall, before fitting the housing body onto the outside of the cell component, the insulating film is wrapped around the outside of the cell body.

[0085] In the above technical solution, the battery cell components and the insulating film are installed together in the casing, which facilitates the installation of the insulating film and makes it easier to achieve insulation between the battery cell components and the casing components.

[0086] Thirdly, embodiments of this application provide a battery comprising the aforementioned battery cell.

[0087] In the above technical solution, the performance of the battery can be improved by using the aforementioned battery cells.

[0088] In some embodiments, the battery includes a housing, multiple battery cells are housed in the housing, the bottom of the housing is a housing bottom plate, and the terminals are located on the side of the housing component facing the housing bottom plate, or on the side of the housing component away from the housing bottom plate.

[0089] In the above technical solution, when the terminal component of the battery cell is located on the side of the housing component facing the bottom plate of the box, the battery cell 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 of the battery cell is located on the side of the housing component away from the bottom plate of the box, the battery cell is in an upright state, and the electrolyte is not easy to leak; therefore, the orientation of the battery cell and the box can be flexibly set.

[0090] Fourthly, embodiments of this application provide an electrical device including the battery described above.

[0091] In the above technical solution, the improved battery performance is beneficial to enhancing the power consumption performance of the electrical device. Attached Figure Description

[0092] 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.

[0093] Figure 1 is a structural schematic diagram of a vehicle provided in some embodiments of this application;

[0094] Figure 2 is an exploded view of a battery provided in some embodiments of this application;

[0095] Figure 3 is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0096] Figure 4 is an exploded view of the battery cell shown in Figure 3;

[0097] Figure 5 is an exploded view of a single battery cell provided in some embodiments of this application;

[0098] Figure 6 is a cross-sectional view of a battery cell provided in some embodiments of this application;

[0099] Figure 7 is a partial schematic diagram of the battery cell shown in Figure 6;

[0100] Figure 8 is a schematic diagram of an adapter provided in some embodiments of this application;

[0101] Figure 9 is a schematic diagram of an adapter provided in some embodiments of this application;

[0102] Figure 10 is a cross-sectional view of a battery cell provided in some embodiments of this application;

[0103] Figure 11 is a cross-sectional view of a battery cell provided in some embodiments of this application;

[0104] Figure 12 is a cross-sectional view of a battery cell provided in some embodiments of this application, in which the terminal component is in a state before being covered by the first shell wall;

[0105] Figure 13 is a cross-sectional view of a battery cell provided in some embodiments of this application, in which the terminal component is in a state before being covered by the first shell wall;

[0106] Figure 14 is a cross-sectional view of a battery cell provided in some embodiments of this application, in which the terminal component is in a state before being covered by the first shell wall;

[0107] Figure 15 is a schematic diagram of the insulating film covering provided in some embodiments of this application;

[0108] Figure 16 is a schematic diagram of the insulating film covering provided in some embodiments of this application;

[0109] Figure 17 is a schematic diagram of an insulating bracket provided in some embodiments of this application;

[0110] Figure 18 is a schematic diagram of the assembly of the insulating bracket shown in Figure 17;

[0111] Figure 19 is a schematic diagram of an insulating bracket provided in some embodiments of this application;

[0112] Figure 20 is a schematic diagram of the assembly of the insulating bracket shown in Figure 19;

[0113] Figure 21 is a schematic diagram of the pole post component provided in some embodiments of this application;

[0114] Figure 22 is another schematic diagram of the pole post component shown in Figure 21;

[0115] Figure 23 is a view along direction B shown in Figure 22;

[0116] Figure 24 is a cross-sectional view of CC in Figure 22;

[0117] Figure 25 is a partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0118] Figure 26 is a partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0119] Figure 27 is a partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0120] Figure 28 is a partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0121] Figure 29 is a partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0122] Figure 30 is a partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0123] Figure 31 is a partial cross-sectional view of a battery cell provided in some embodiments of this application, in which the terminal component is in a state before being covered by the first shell wall;

[0124] Figure 32 is a partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0125] Figure 33 is a partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0126] Figure 34 is a partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0127] Figure 35 is a flowchart of a battery cell processing method according to some embodiments of this application;

[0128] Figure 36 is a flowchart of a battery cell processing method according to some embodiments of this application;

[0129] Figures 37A-37E are schematic diagrams showing the process breakdown of some embodiments of this application;

[0130] Figure 38 is a flowchart of a battery cell processing method according to some embodiments of this application;

[0131] Figures 39A-39D are schematic diagrams showing the process breakdown of some embodiments of this application;

[0132] Figure 40 is a flowchart of a battery cell processing method according to some embodiments of this application;

[0133] Figure 41 is a flowchart of a battery cell processing method according to some embodiments of this application;

[0134] Figure 42 is a flowchart of the processing method of a battery cell according to some embodiments of this application;

[0135] Figure 43 is a flowchart of the processing method of a battery cell according to some embodiments of this application;

[0136] Figure 44 is a flowchart of a battery cell processing method according to some embodiments of this application;

[0137] Figure 45 is a flowchart of the processing method of a battery cell according to some embodiments of this application;

[0138] Figure 46 is a flowchart of the processing method of a battery cell according to some embodiments of this application;

[0139] Figure 47 is a flowchart of a battery cell processing method according to some embodiments of this application;

[0140] Figure 48 is a flowchart of a battery cell processing method according to some embodiments of this application;

[0141] Figure 49 is a flowchart of a battery cell processing method according to some embodiments of this application;

[0142] Figures 50A-50F are schematic diagrams showing the process breakdown of some embodiments of this application.

[0143] Reference numerals: Electrical device 1000; Battery 100; Controller 200; Motor 300; Housing 101; First housing section 1011; Second housing section 1012; Battery cell 102; First direction F1; Second direction F2; Third direction F3; Fifth direction F5; Sixth direction F6; Housing component 1; Housing body 11; First housing wall 111; First recess 1111; Overlapping part 1112; Mounting hole 112; Opening 113; Second housing wall 114; Housing cover 12; Receiving cavity 13; Sealing ring 14; Terminal component 2; Terminal body 21; Inner end face 211; Outer end face 213; Through part 214; Riveting part 2141; Inner limiting part 215; Outer limiting part 216; First pole piece 21a; Second pole piece 21b; Mating hole 21b1; Adapter structure 22; Inner end face 220 of adapter structure; Surrounding area 2201; Flange portion 22a; Second recess 22b; First adapter ring 221; Second adapter ring 222; Stop ring portion 2221; First insulating frame 224; Third adapter ring 223; Inner extension portion 2231; Outer extension portion 2232; Second insulating frame 225; Fourth adapter ring 227; Mating ring portion 2271; Third insulating frame 228; Insulating structure 23; sealing structure 231; axial side portion 231a; first insulating component 232; second insulating component 234; insulating sealing component 24; cell component 3; cell assembly 31; electrode tab 311; stacked portion 312; cell body 32; cell group 32A; electrode tab group 33; free end 331; first gathering portion 332; second gathering portion 333; first opening slot 334; axial section of cell component 34; adapter 35; adapter foil 350; first adapter foil 3501; Second adapter foil 3502; First connecting part 351; Second connecting part 352; Bending part 353; Second groove 3531; Third connecting part 354; Second opening groove 355; Clamping structure 356; Clamping part 3561; Main structure 357; Branch structure 358; Branch segment 3581; Insulating component 4; Perforation 40; Insulating film 41; Tear-opening structure 411; Insulating bracket 42; Bracket body 421; First separator 422; Receiving groove 5; Pressure relief component 6; Binding component 8. Detailed Implementation

[0144] 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.

[0145] 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.

[0146] 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.

[0147] 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.

[0148] 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.

[0149] 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.

[0150] In this application, "multiple" means two or more (including two).

[0151] 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 to these. The battery cell may be cylindrical, flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited to these. Battery cells are generally divided into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and the embodiments of this application are not limited to these.

[0152] The battery mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application can be a battery module or a battery pack. A battery module generally includes multiple battery cells. A battery generally includes a housing for encapsulating one or more battery cells, or one or more battery modules, which can prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells; of course, the battery may also not include a housing.

[0153] For example, a single battery cell typically includes a casing, a cell assembly, and an electrolyte (which may be a solid electrolyte layer located between the positive and negative electrodes in a solid-state battery). The casing houses the cell assembly and the electrolyte, and has at least one positive electrode post and at least one negative electrode post. The cell assembly includes one or more cell assemblies, which are formed by stacking or winding positive electrode plates, negative electrode plates, and a separator (this structure may be omitted in solid-state batteries). The material of the casing is not limited, and includes, but is not limited to, aluminum casings, steel casings, aluminum-plastic composite films, plastics, or other materials resistant to electrolyte corrosion.

[0154] The positive electrode generally includes a positive current collector and a positive active material layer. The positive active material layer is directly or indirectly coated on the positive current collector. 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 a positive electrode tab. Multiple positive electrode tabs are stacked together and form an electrical connection with the positive electrode post. For example, the multiple stacked positive electrode tabs can be directly soldered to the positive electrode post to form an electrical connection; or, the battery cell assembly can also include a positive electrode adapter. The multiple stacked positive electrode tabs are soldered to one end of the positive electrode adapter, and the other end of the positive electrode adapter is soldered to the positive electrode post, so that the positive electrode tabs and the positive electrode post form an electrical connection.

[0155] The negative electrode generally includes a negative current collector and a negative active material layer. The negative active material layer is directly or indirectly coated on the negative current collector. 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 a negative electrode tab. Multiple negative electrode tabs are stacked together and form an electrical connection with the negative electrode post. For example, the stacked negative electrode tabs can be directly welded to the negative electrode post to form an electrical connection; alternatively, the battery cell assembly may also include a negative electrode adapter. The stacked negative electrode tabs are welded to one end of the negative electrode adapter, and the other end of the negative electrode adapter is welded to the negative electrode post, so that the negative electrode tabs and the negative electrode post form an electrical connection. The material of the separator is not limited; for example, it can be polypropylene or polyethylene.

[0156] The pressure relief component on the battery cell mentioned in this application is used to release internal gases when the internal pressure of the battery cell is too high (e.g., due to overcharging), thereby reducing the internal pressure of the battery cell and preventing it from exploding due to excessively rapid pressurization. For example, the pressure relief component can be an explosion-proof valve, an explosion-proof plate, etc.

[0157] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, batteries, as the power source, play an irreplaceable and crucial role. Among these, batteries, as the core component of new energy vehicles, have high requirements in terms of reliability.

[0158] In related technologies, the tabs of battery cells are easily inserted upside down into the cell body, which can easily cause short circuits in the battery cells. The reliability of the battery cells needs to be improved, which hinders the further improvement of battery reliability.

[0159] Based on the above considerations, a battery cell is proposed. The battery cell includes a housing component, a terminal component, and a cell component. The housing component has a receiving cavity and includes a first housing wall that helps to define the receiving cavity. The terminal component is mounted on the first housing wall and includes a terminal body. The cell component includes a cell body and an adapter. The cell body is disposed in the receiving cavity and has a tab assembly connected to its end. The tab assembly is electrically connected to the terminal body through the adapter, and the adapter supports the free end of the tab assembly.

[0160] In the above technical solution, by setting the tab assembly to be electrically connected to the electrode post body through an adapter, and making the adapter support the free end of the tab assembly, the length of the tab assembly can be shortened and the redundancy of the tab assembly can be improved. This is beneficial to improving problems such as wrinkling, bending and breakage of the tab pieces. At the same time, the adapter's support for the free end helps to reduce the risk of short circuits caused by the free end of the tab assembly being inserted into the cell body or into the root position of the adjacent cell body, thereby improving the reliability of the battery cell.

[0161] The technical solutions described in the embodiments of this application are applicable to battery cells, batteries containing battery cells, and electrical devices using batteries.

[0162] Electrical devices can include, but are not limited to, vehicles, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft. 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.

[0163] For ease of explanation, the following embodiments will use a vehicle as an example to illustrate the electrical device 1000.

[0164] Please refer to Figure 1, which is a schematic diagram of the structure of an electrical device 1000 provided in some embodiments of this application as a vehicle. The vehicle can be a gasoline vehicle, a natural gas vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. The vehicle is equipped with a battery 100, which can be located at the bottom, front, or rear of the vehicle. The battery 100 can be used to power the vehicle; for example, the battery 100 can serve as the vehicle's operating power source. The vehicle may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle during starting, navigation, and driving. In some embodiments of this application, the battery 100 can not only serve as the vehicle's operating power source but also as the vehicle's driving power source, replacing or partially replacing gasoline or natural gas to provide driving power for the vehicle.

[0165] Please refer to Figure 2, which is an exploded view of the structure of a battery 100 provided in some embodiments of this application. The battery 100 includes a housing 101 and a plurality of battery cells 102, with the battery cells 102 housed within the housing 101. The housing 101 provides assembly space for the battery cells 102, and can employ various structures. In some embodiments, the housing 101 may include a first housing portion 1011 and a second housing portion 1012, which overlap each other, together defining a receiving cavity for accommodating the battery cells 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.

[0166] For example, referring to Figure 2, the first box portion 1011 and the second box portion 1012 can both be hollow structures with an opening on one side, with the opening side of the first box portion 1011 covering the opening side of the second box portion 1012 to form a box 101 with a receiving space. Alternatively, the second box portion 1012 can be a hollow structure with an opening at one end, and the first box portion 1011 can be a plate-like structure, with the first box portion 1011 covering the opening side of the second box portion 1012, so that the first box portion 1011 and the second box portion 1012 together define a receiving cavity. Of course, the box 101 formed by the first box portion 1011 and the second box portion 1012 can be of various shapes, such as a cylinder or a cuboid.

[0167] In battery 100, there can be one or more battery cells 102. When there are multiple battery cells 102, they can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 102 are connected in both series and parallel. Multiple battery cells 102 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 102 is housed within housing 101. Alternatively, battery 100 can also be composed of multiple battery cells 102 first connected in series, parallel, or in a mixed configuration to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is then housed within housing 101. Battery 100 may also include other structures; for example, battery 100 may also include a busbar component for realizing the electrical connection between multiple battery cells 102.

[0168] Please refer to Figures 3-5. Figure 3 is a structural schematic diagram of the battery cell 102 provided in some embodiments of this application. Figure 4 is an exploded view of the battery cell shown in Figure 3. Figure 5 is an exploded view of the battery cell provided in some embodiments of this application. The battery cell 102 is a cuboid. The height direction of the battery cell 102 is the first direction F1, the thickness direction of the battery cell 102 is the second direction F2, and the width direction of the battery cell 102 is the 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. In other embodiments of this application, the battery cell 102 can also be a polygonal prism, a flat body, or other shapes. The fourth direction F4 mentioned below can be parallel to the second direction, and the fifth direction F5 can be parallel to the first direction.

[0169] Please refer to Figures 6 and 7. Figure 6 is a cross-sectional view of a battery cell 102 provided in some embodiments of this application, and Figure 7 is a partial schematic diagram along the battery cell 102 shown in Figure 6. In the embodiments of this application, the battery cell 102 includes a housing component 1, a terminal component 2, and a cell component 3.

[0170] The terminal post 2 is mounted on the housing component 1. The housing component 1 has a receiving cavity 13 and includes a first housing wall 111, which defines the receiving cavity 13. The terminal post 2 is mounted on the first housing wall 111. Exemplarily, the first housing wall 111 has a mounting hole 112, and the terminal post 2 is disposed at the mounting hole. "The terminal post 2 is mounted on the first housing wall 111" means that the terminal post 2 and the first housing wall 111 have an assembly connection relationship, such as welding or riveting. Therefore, the housing component 1 and the terminal post 2 are separate components, assembled together. This allows for separate processing of the housing component 1 and the terminal post 2, facilitating their processing and also aiding in the manufacturing of the battery cell 102.

[0171] The battery cell component 3 includes a battery cell body 32, which is disposed within the receiving cavity 13. A tab assembly 33 is connected to the end of the battery cell body 32, and the tab assembly 33 is electrically connected to the terminal body 21. Exemplarily, the battery cell component 3 includes one or more battery cell assemblies 31. Each battery cell assembly 31 includes a battery cell body 32 and a tab assembly 33. The portion of the current collector in the battery cell assembly 31 coated with an active material layer constitutes the battery cell body 32, and the portion not coated with an active material layer constitutes the tab assembly 33. Each tab assembly 33 corresponds one-to-one with a battery cell body 32, and the tab assembly 33 may include multiple layers of tab sheets 311.

[0172] The cell component 3 also includes an adapter 35, through which the tab assembly 33 is electrically connected to the terminal body 21. Exemplarily, the battery 100 also includes a busbar component located outside the battery cell 102, which is connected to the terminal body 21 to form electrical conductivity, so as to achieve electrical connection of multiple battery cells 102 through the busbar component. Therefore, by indirectly connecting the tab group 33 and the terminal body 21 through the adapter 35 to form electrical conduction, the length of the tab group 33 can be shortened and the redundancy of the tab group 33 can be improved. This is beneficial to improving the problems of wrinkling, bending and breakage of the tab pieces 311 of the tab group 33. At the same time, since the length of the tab group 33 is relatively short, and the adapter 35 has certain restrictions on the tab group 33 due to its connection with the tab group 33, it is beneficial to reduce the risk of short circuit caused by the tab group 33 being inserted backward into the cell body 32. Moreover, by flexibly designing the shape and material of the adapter 35, it is easy to reduce the connection difficulty between the adapter 35 and the terminal body 21 and the tab group 33, which is beneficial to improving the assembly convenience of the battery cell 102.

[0173] In addition, the perforation 40 operation of the adapter 35, the connection operation between the adapter 35 and the terminal component 2 (which may be omitted), and the connection operation between the terminal component 2 and the housing component 1 are all less likely to cause cracking at the connection position between the cell body 32 and the tab assembly 33, thereby improving the reliability of the battery cell 102.

[0174] For example, when the terminal component 2 is the negative electrode, the terminal body 21 can be an aluminum-copper composite component, wherein the copper-aluminum composite component can include an aluminum part and a copper part, the two parts are connected by a physical connection, the aluminum part is located on the side of the copper part away from the cell body 32, and it is easy to form a reliable connection with the aluminum busbar component, and the copper part is easy to connect with the copper foil tab 311 of the negative electrode or the negative electrode adapter 35; when the terminal component 2 is the positive electrode, the terminal body 21 can be an aluminum component, the aluminum component is easy to form a reliable connection with the aluminum busbar component, and the aluminum component is also easy to connect with the aluminum foil tab 311 of the positive electrode or the positive electrode adapter 35.

[0175] There are no specific restrictions on the connection method between the adapter 35 and the electrode assembly 33, nor are there any specific restrictions on the connection method between the adapter 35 and the electrode body 21. For example, the adapter 35 and the electrode body 21 can be connected by methods including but not limited to ultrasonic welding, a combination of ultrasonic pre-welding and laser welding, resistance welding, pressure welding, brazing, riveting, drilling, gluing, etc.

[0176] Referring to Figure 7, the adapter 35 supports the free end 331 of the tab assembly 33. For example, a portion of the adapter 35 can support the side of the free end 331 of the tab assembly 33 facing the cell body 32, or a portion of the adapter 35 can support the side of the free end 331 of the tab assembly 33 away from the terminal body 21, such that the free end 331 of the tab assembly 33 is located between the portion of the adapter 35 supporting the free end 331 of the tab assembly 33 and the inner end face 211 of the terminal body 21. Therefore, the upper part of the adapter 35... The aforementioned support configuration can prevent the free end 331 of the tab assembly 33 from moving toward the cell body 32. For example, when the tab assembly 33 is subjected to an external force that causes the tab assembly 33 to tend to move toward the cell body 32, the adapter 35 can apply a reaction force to the free end 331 of the tab assembly 33 to hinder the tendency of the tab assembly 33 to move toward the cell body 32, thereby reducing the risk of the tab assembly 33 moving toward the cell body 32 and causing a short circuit due to inverted insertion into the cell body 32, which is beneficial to improving the reliability of the battery cell 102.

[0177] The term "free end 331 of tab assembly 33" can be understood as the end of tab assembly 33 furthest from cell component 3 in its extension direction. Tab assembly 33 has a first end and a second end in its extension direction. The first end is connected to cell component 3, and the second end is the free end 331 of tab assembly 33. "Inner end face 211 of pole body 21" is the surface of pole body 21 facing cell component 3. In some examples, the inner end face 211 of pole body 21 is electrically connected to adapter 35, which can reduce the assembly and connection difficulty between adapter 35 and pole body 21, improve processing efficiency, and shorten the length of adapter 35 compared to connecting adapter 35 to other parts of pole body 21, thus saving materials and costs. Of course, in other examples, adapter 35 can also be electrically connected to other parts of pole body 21.

[0178] In the above technical solution, by setting the tab group 33 to be electrically connected to the electrode post body 21 through the adapter 35, and making the adapter 35 support the free end 331 of the tab group 33, the length of the tab group 33 can be shortened and the redundancy of the tab group 33 can be improved. This is beneficial to improving the problems of wrinkling, bending and breaking of the tab piece 311 of the tab group 33. At the same time, the support of the adapter 35 on the free end 331 helps to reduce the risk of short circuit caused by the free end 331 of the tab group 33 being inserted into the cell body 32 or into the root position of the adjacent cell body 32, thereby improving the reliability of the battery cell 102.

[0179] Please refer to Figure 7. In some embodiments of this application, the tab assembly 33 includes a plurality of tab pieces 311. The plurality of tab pieces 311 of the tab assembly 33 converge (i.e., converge toward each other) and connect at a position away from the cell body 32 to form a first convergence portion 332 at the free end 331. At least a portion of the first convergence portion 332 is connected to a part of the adapter 35 on the side away from the cell body 32.

[0180] In the above technical solution, by setting the first gathering part 332 to be connected to the adapter 35, and the first gathering part 332 having a certain rigidity, it is easy to improve the connection reliability between the first gathering part 332 and the adapter 35; and at least a part of the first gathering part 332 is connected to a part of the adapter 35 on the side away from the main body 32 of the battery cell, so that the above part of the adapter 35 can support at least a part of the first gathering part 332, and the multi-layer tabs 311 of the first gathering part 332 are not easy to loosen, which can improve the support reliability of the adapter 35 for the free end 331.

[0181] In the above technical solution, the multiple tabs 311 of the tab assembly 33 not only converge and move closer together when forming the first gathering portion 332, but also connect into an integral structure. For example, the multiple tabs 311 of the tab assembly 33 can be connected into an integral plate structure by welding (e.g., ultrasonic welding) to form the first gathering portion 332. Alternatively, the multiple tabs 311 of the tab assembly 33 can be converged and connected to form the first gathering portion 332 by means of conductive adhesive bonding, etc., which will not be elaborated here.

[0182] It should be noted that, in the embodiments of this application, the tabs 311 are divided into positive electrode tabs 311 and negative electrode tabs 311. The positive electrode tabs 311 that need to be gathered together are stacked together and connected (e.g., ultrasonic pre-welding) to form the first gathered portion 332 of the positive electrode. This reduces the interlayer gap at the free end 331 of the tab assembly 33, allowing the multiple loose positive electrode tabs 311 to form a plate structure with a certain rigidity at the free end 331. Similarly, the negative electrode tabs 311 that need to be gathered together are stacked together and connected (e.g., ultrasonic pre-welding) to form the first gathered portion 332 of the negative electrode. This reduces the interlayer gap at the free end 331 of the tab assembly 33, allowing the multiple loose negative electrode tabs 311 to form a plate structure with a certain rigidity at the free end 331.

[0183] Please refer to Figure 7. In some embodiments of this application, the adapter 35 includes a first connecting part 351 and a second connecting part 352. The first connecting part 351 is connected to the pole post component 2, and the second connecting part 352 is connected to the first gathering part 332. The second connecting part 352 supports the first gathering part 332. Thus, the second connecting part 352 can both connect the adapter 35 to the tab assembly 33 and support the free end 331 of the tab assembly 33.

[0184] Wherein, the orthographic projection of at least part of the first gathering portion 332 on the first shell wall 111 is located within the orthographic projection range of the second connecting portion 352 on the first shell wall 111, and the thickness t2 of the second connecting portion 352 is greater than or equal to the thickness t4 of the first gathering portion 332.

[0185] In the above technical solution, by setting the orthographic projection of the supported part of the first gathering part 332 on the first shell wall 111 to be within the orthographic projection range of the second connecting part 352, and the thickness of the second connecting part 352 being greater than or equal to the thickness of the first gathering part 332, the cross-sectional area of ​​the second connecting part 352 can be greater than or equal to the cross-sectional area of ​​the first gathering part 332. This is beneficial to reduce the resistance at the connection position between the second connecting part 352 and the first gathering part 332, and improve the overcurrent capacity at the connection position between the second connecting part 352 and the first gathering part 332, thereby facilitating the reduction of the internal resistance of the battery cell 102 and improving the overcurrent capacity of the battery cell 102.

[0186] For example, the first direction is perpendicular to the first shell wall 111. Taking the surface where the first shell wall 111 is located as the projection plane and the first direction as the projection direction, the orthographic projection of the portion of the first retractable part 332 supported by the adapter 35 is located within the orthographic projection range of the first connecting part 352. Then, the size of the first retractable part 332 in the second direction is less than or equal to the size of the second connecting part 352 in the second direction, and the size of the first retractable part 332 in the third direction is less than or equal to the size of the second connecting part 352 in the third direction.

[0187] Please refer to Figure 7. In some embodiments of this application, multiple tabs 311 of the tab assembly 33 converge near the cell body 32 to form a second gathering portion 333. One end of the second gathering portion 333 is bent and connected to the first gathering portion 332, and the other end of the second gathering portion 333 is connected to the cell body 32. The end face of the part of the adapter 35 connected to the first gathering portion 332 extends to the bending position near the second gathering portion 333.

[0188] In the above technical solution, the second gathering part 333 is bent and connected to the first gathering part 332, which allows the tab assembly 33 to be bent to form the first opening groove 334. The first gathering part 332 and the second gathering part 333 are the two opposite groove walls of the first opening groove 334. The end face of the part of the adapter 35 that supports the free end 331 extends to the bending position near the second gathering part 333, so that the end face of the part of the adapter 35 that supports the free end 331 extends beyond the first gathering part 332, so that the adapter 35 supports the entire first gathering part 332.

[0189] In the above technical solution, by setting one end of the second gathering part 333 to be bent and connected to the first gathering part 332, the end face of the part of the adapter 35 connected to the first gathering part 332 extends to the bending position near the second gathering part 333, which makes it easier for the adapter 35 to support the entire first gathering part 332 and improve the support reliability of the free end 331; at the same time, since the multiple tabs 311 of the tab group 33 only converge and do not connect when forming the second gathering part 333, the adapter 35 can have a certain indirect pressure effect on the bending position of the second gathering part 333, which makes it easier to improve the tightness of the second gathering part 33, so that the second gathering part 333 maintains the preset converged shape and cannot be dispersed, which helps to reduce the risk of the second gathering part 333 being inserted upside down into the battery cell body 31.

[0190] In the embodiments of this application, the statement that "the plurality of tabs 311 of the tab group 33 converge and connect near the cell body 32 to form a first gathering portion 332, and the plurality of tabs 311 of the tab group 33 converge away from the cell body 32 to form a second gathering portion 333" aims to illustrate that: along the extension direction of the tabs 311, the second gathering portion 333 and the first gathering portion 332 are arranged sequentially in a direction away from the cell body 32, and the specific positions of the first gathering portion 332 and the second gathering portion 333 are not limited, that is, it is not required that the second gathering portion 333 be very close to the cell body 32, nor is it required that the first gathering portion 332 be very far from the cell body 32. In some optional examples, the current collector of the cell body 32 and the tabs 311 can be an integral part, for example, for the positive electrode, it can be an integrally formed aluminum foil, and for the negative electrode, it can be an integrally formed copper foil, etc.

[0191] Please refer to Figure 7. In some embodiments of this application, the tab assembly 33 is bent to form a first opening groove 334. At least a portion of the tab assembly 33 is generally formed in a C-shape. The free end 331 defines at least a portion of the groove wall of the first opening groove 334 near the pole body 21. The adapter 35 extends into the first opening groove 334 and abuts against the free end 331.

[0192] In the above technical solution, by setting the adapter 35 to extend into the first opening groove 334 formed by bending the tab assembly 33 and abutting against the free end 331, the reliability of the adapter 35 supporting the free end 331 can be improved. At the same time, the bent tab assembly 33 can play a buffering role. When the battery cell 102 is used in a vibration environment, the impact of the cell body 32 toward the first shell wall 111 can be reduced, thus protecting the cell component 3 and improving the reliability of the battery cell 102.

[0193] As can be seen, in the embodiments of this application, the tab assembly 33 can be bent to form one or more opening slots. When the tab assembly 33 is bent to form one opening slot, the opening slot is the first opening slot 334; when the tab assembly 33 is bent to form multiple opening slots, the multiple opening slots include the first opening slot 334 and the third opening slot. At this time, the opening orientations of two adjacent opening slots can be arranged at an angle, for example, the opening orientations of two adjacent opening slots are at an obtuse angle, or the opening orientations of two adjacent opening slots are at a 180° angle, etc.

[0194] Please refer to Figure 7. In some embodiments of this application, the adapter 35 is bent to form a second opening groove 355. The second opening groove 355 is adjacent to the first opening groove 334, and the second opening groove 355 is located on the side of the first opening groove 334 facing the pole body 21. The opening orientations of the second opening groove 355 and the first opening groove 334 are arranged at an angle.

[0195] As can be seen, in the direction from the electrode body 21 to the cell body 32, the first opening groove 334 and the second opening groove 355 are arranged adjacent to each other (for example, as shown in Figure 7, the first opening groove 334 and the second opening groove 355 are adjacent vertically, the opening of the first opening groove 334 is roughly facing to the left, and the opening of the second opening groove 355 is roughly facing to the right).

[0196] Therefore, the conductive portion 4, formed by the tab assembly 33 and the adapter 35, can exhibit a reciprocating, serpentine shape. The conductive portion 4 acts as a buffer, reducing the impact of the cell body 32 against the first shell wall 111 when the battery cell 102 is used in a vibration environment, thus protecting the cell component 3 and improving the reliability of the battery cell 102. Furthermore, since the conductive portion 4 does not extend irregularly, it reduces the mutual interference and friction between the tabs 311 and the risk of the tabs 311 being inserted backwards into the cell body 32, further enhancing the reliability of the battery cell 102.

[0197] For example, referring again to Figure 7, the tab assembly 33 includes a first gathered portion 332 and a second gathered portion 333 bent and connected, which respectively form opposite side walls of the first opening groove 334; the adapter 35 includes a first connecting portion 351 and a second connecting portion 352 bent and connected, which respectively form opposite side walls of the second opening groove 355. Thus, the conductive portion 4 can exhibit a reciprocating S-shape, thereby shortening the length of the conductive portion 4, simplifying its structure, and facilitating its processing.

[0198] Please refer to Figures 7-9. In some embodiments of this application, the end of the adapter 35 away from the pole body 21 has a clamping structure 356. The clamping structure 356 supports the free end 331 and includes two clamping parts 3561 arranged opposite to each other. The free end 331 is clamped between the two clamping parts 3561 and connected to each clamping part 3561. The two clamping parts 3561 are respectively located on both sides of the thickness of the free end 331.

[0199] For example, one end of the adapter 35 with the clamping structure 356 can be approximately Y-shaped, and the two branches of the Y-shaped structure can respectively form two clamping parts 3561. The free end 331 is clamped between the two branches and is electrically connected to each branch.

[0200] In the above technical solution, by clamping the free end 331 between the two clamping parts 3561, the two clamping parts 3561 can limit the free end 331 of the tab assembly 33, which is beneficial to improve the connection reliability of the multiple tabs 311 of the tab assembly 33 at the free end 331. At the same time, one of the clamping parts 3561, which is located near the cell body 32, can support the free end 331 of the tab assembly 33, and support it on the side of the free end 331 of the tab assembly 33 away from the pole body 21, so as to prevent the free end 331 of the tab assembly 33 from moving toward the cell body 32 and reduce the risk of reverse insertion.

[0201] Furthermore, when the free end 331 is fixed (e.g., welded) to each clamping part 3561, the free end 331 can be first fitted between the two clamping parts 3561, and then pressure can be applied to the opposite sides of the two clamping parts 3561 to achieve connection. This allows the two clamping parts 3561 to separate the free end 331 of the tab assembly 33 from the pressure-applying device, thus protecting the free end 331 of the tab assembly 33. The pressure-applying device will not contact the free end 331 of the tab assembly 33, reducing the risk of cracking of the tab pieces 311 due to their thinness. This improves the welding quality between the tab assembly 33 and the adapter 35, enhancing the connection reliability between the tab assembly 33 and the adapter 35. Especially when the thickness of the clamping part 3561 is greater than the thickness of a single tab piece 311, the clamping part 3561 can effectively protect the tab piece 311, reducing the risk of cracking during connection.

[0202] In some examples, for a structure where the free end 331 of the tab assembly 33 is clamped between two clamping portions 3561: during the processing of the battery cell 102, the free end 331 of the tab assembly 33 can first form a first gathered portion 332, and then at least a portion of the first gathered portion 332 is disposed between the two clamping portions 3561, and the first gathered portion 332 is connected to both clamping portions 3561. In short, the multiple tabs 311 of the tab assembly 33 are pre-connected (e.g., pre-welded) at the free end 331 to form the first gathered portion 332, and then the first gathered portion 332 is connected to the clamping structure 356; or, the free end 331 of the tab assembly 33 can be gathered first to form a first gathered portion 332. A stacked portion is formed, with at least a portion of the stacked portion disposed between two clamping portions 3561, and the stacked portion is connected to both clamping portions 3561. Thus, while connecting the stacked portion to the two clamping portions 3561, the multiple tabs 311 of the stacked portion are connected, so that the free end 331 of the tab assembly 33 simultaneously forms a first gathering portion 332. In short, the multiple tabs 311 of the tab assembly 33 only gather at the free end 331 to form the stacked portion. While connecting the stacked portion to the clamping structure 356, the multiple tabs 311 of the stacked portion connect to form the first gathering portion 332. This method can save the pre-connection process of the multiple tabs 311 at the free end 331. Specifically, when the multiple tabs 311 of the tab assembly 33 form the stacked portion at the free end 331, they only converge but are not connected.

[0203] Of course, in other embodiments of this application, the end of the adapter 35 away from the electrode body 21 may not be provided with the clamping structure 356. For example, the end of the adapter 35 away from the electrode body 21 may be formed as a flat plate structure. The flat plate structure can support the end of the free end 331 of the tab assembly 33 away from the electrode body 21. This can also achieve the purpose of the adapter 35 supporting the free end 331 of the tab assembly 33, thereby preventing the free end 331 of the tab assembly 33 from moving toward the cell body 32.

[0204] Please refer to Figures 7-9. In some embodiments of this application, the adapter 35 includes a first connecting portion 351, a bending portion 353, and a second connecting portion 352. The first connecting portion 351 and the second connecting portion 352 are opposite to each other. The bending portion 353 is bent and connected between the first connecting portion 351 and the second connecting portion 352. The first connecting portion 351 is connected to the pole body 21, and the second connecting portion 352 supports the free end 331 of the tab assembly 33.

[0205] Therefore, by supporting the free end 331 of the tab assembly 33 through the second connecting part 352, the redundancy of the tab assembly 33 can be improved, and the risk of short circuit caused by the tab assembly 33 being inserted into the cell body 32 can be reduced. Moreover, the bent adapter 35 can play a buffer support role while reliably supporting the free end 331 of the tab assembly 33, which helps to reduce the risk of the cell component 3 hitting the casing component 1 and improve the reliability of the battery cell 102.

[0206] In some examples, referring to Figure 7, the adapter 35 is generally C-shaped or U-shaped, the first connecting portion 351 is generally flat, and the first connecting portion 351 is laid on the inner end face 211 of the pole body 21. The thick side surface of the first connecting portion 351 is connected to the inner end face 211 of the pole body 21. The area of ​​the inner end face 211 of the pole body 21 is greater than or equal to the area of ​​the aforementioned thick side surface of the first connecting portion 351. The first connecting portion 351 can completely rest on the inner end face 211 of the pole body 21, thereby increasing the connection area between the inner end face 211 of the pole body 21 and the first connecting portion 351, and improving the current carrying efficiency. In other examples, the adapter 35 is generally L-shaped, the first connecting portion 351 is generally flat, and the end face of the first connecting portion 351 away from the second connecting portion 352 is connected to the inner end face 211 of the pole body 21.

[0207] It should be noted that, in the embodiments of this application, the adapter 35 supports the free end 331 of the tab assembly 33, such that the free end 331 of the tab assembly 33 is located between the portion of the adapter 35 used to support the free end 331 and the inner end face 211 of the pole body 21. The free end 331 of the tab assembly 33 and the inner end face 211 of the pole body 21 can be in contact or spaced apart. Specifically, when the free end 331 of the tab assembly 33 is spaced apart from the inner end face 211 of the pole body 21, a portion of the adapter 35 (e.g., the first connecting portion 351 mentioned above) can be located between the free end 331 of the tab assembly 33 and the inner end face 211 of the pole body 21, or, no portion of the adapter 35 may be located between the free end 331 of the tab assembly 33 and the inner end face 211 of the pole body 21.

[0208] In some examples, referring to Figures 7-9, the second connecting portion 352 is configured as a clamping structure 356, and the second connecting portion 352 includes two opposing clamping portions 3561. The thickness of the second connecting portion 352 is the thickness of the clamping structure 356, which is the sum of the thicknesses t5 of the two clamping portions 3561. The free end 331 is clamped between the two clamping portions 3561 and is connected to each clamping portion 3561. Of course, in some examples, the second connecting portion 352 can also be configured as a flat plate structure, with the second connecting portion 352 supporting the side of the free end 331 of the tab assembly 33 facing away from the pole post body 21, so that the free end 331 of the tab assembly 33 is located between the second connecting portion 352 and the pole post body 21.

[0209] Please refer to Figures 7 and 8. In some embodiments of this application, the thickness of the bent portion 353 is less than the thickness of at least one of the first connecting portion 351 and the second connecting portion 352; and / or, in the extending direction of the central axis of the bent portion 353, the width of the bent portion 353 is less than the width of at least one of the first connecting portion 351 and the second connecting portion 352.

[0210] For example, referring to Figure 8, the thickness of the bent portion 353 is t3, the thickness of the first connecting portion 351 is t1, the thickness of the second connecting portion 352 is t2, t3 < t1 and / or t3 < t2; and / or, the width of the bent portion 353 is d3, the width of the first connecting portion 351 is d1, the width of the second connecting portion 352 is d2, d3 < d1 and / or d3 < d2.

[0211] In the above technical solution, by setting the thickness of the bending portion 353 to be less than the thickness of at least one of the first connecting portion 351 and the second connecting portion 352, and the width of the bending portion 353 to be less than the width of at least one of the first connecting portion 351 and the second connecting portion 352, the material reduction in the thickness and width of the bending portion 353 is achieved, so that the first connecting portion 351 and the second connecting portion 352 have a certain rigidity, thus realizing a reliable connection between the adapter 35 and the electrode body 21, and a reliable connection between the adapter 35 and the electrode assembly 33. At the same time, the bending portion 353 is weakened, making it easier for the adapter 35 to bend at the bending portion 353 position. Especially for the case where the adapter 35 is roughly plate-shaped before assembly and has a bending position after assembly, the adapter 35 can achieve a soft connection between the electrode body 21 and the cell body 32, making it easier for the adapter 35 to bend smoothly at the bending portion 353 position during the assembly process, thus improving the ease of assembly.

[0212] Of course, the shape of the adapter 35 before and after assembly can be the same. For example, the adapter 35 can be constructed with a bent portion 353 before and after assembly to bend and connect the first connecting portion 351 and the second connecting portion 352. In this case, the adapter 35 can realize a hard connection between the electrode body 21 and the cell body 32. It can be seen that in the embodiments of this application, regardless of whether the adapter 35 is used to realize a soft connection or a hard connection, it can support the free end 331 of the electrode assembly 33.

[0213] In some examples, the thickness of both the first connecting portion 351 and the second connecting portion 352 is greater than the thickness of the bent portion 353. In this case, at least one side of the thickness of the bent portion 353 can be formed with a first groove to reduce the thickness of the bent portion 353. In other examples, the width of both the first connecting portion 351 and the second connecting portion 352 is greater than the width of the bent portion 353. In this case, at least one side of the width of the bent portion 353 can be formed with a second groove to reduce the width of the bent portion 353.

[0214] Please refer to Figures 8 and 9. In some embodiments of this application, the adapter 35 includes a plurality of adapter foils 350, which are stacked and connected to form a first connecting portion 351 and a second connecting portion 352. The first connecting portion 351 and the second connecting portion 352 are spaced apart. The first connecting portion 351 is connected to the pole body 21, and the second connecting portion 352 is connected to the free end 331.

[0215] It should be noted that, for the first connecting part 351, any two adjacent connecting foils 350 among the plurality of connecting foils 350 are directly connected or indirectly connected; for the second connecting part 352, any two adjacent connecting foils 350 among the plurality of connecting foils 350 are directly connected or indirectly connected, for example, two adjacent connecting foils 350 are indirectly connected through the free end 331 of the tab assembly 33.

[0216] For example, a portion of the stacked multiple adapter foils 350 is directly connected to form a first connecting portion 351, and another portion of the stacked multiple adapter foils 350 is directly connected to a second connecting portion 352. The second connecting portion 352 is connected to the free end 331 of the tab assembly 33. In this case, portions of the multiple adapter foils 350 corresponding to the second connecting portion 352 are all located on the same side of the free end 331 of the tab assembly 33. Alternatively, the adapter 35 includes two adapter foils 350. A portion of the stacked two adapter foils 350 is directly connected to form the first connecting portion 351, and another portion of the stacked two adapter foils 350 is indirectly connected through the free end 331 of the tab assembly 33, so that the adapter 35 forms a second connecting portion 352. In this case, the two adapter foils 350 corresponding to the second connecting portion 352 are respectively located at the free end of the tab assembly 33. The two sides of 331; or, the adapter 35 includes four adapter foils 350, a portion of which are connected to form a second connection portion 352. In this case, two of the adapter foils 350 corresponding to the second connection portion 352 are located on the thickness side of the free end 331 of the tab assembly 33, and the other two adapter foils 350 corresponding to the second connection portion 352 are located on the other side of the thickness of the free end 331 of the tab assembly 33. Then, the two adapter foils 350 on the same side of the free end 331 of the tab assembly 33 in the second connection portion 352 are directly connected, and the adapter foils 350 on the opposite side of the free end 331 of the tab assembly 33 in the second connection portion 352 are indirectly connected through the free end 331 of the tab assembly 33. Of course, the number of adapter foils 350 in the adapter 35 is not limited to two or four, but can also be three, five or more.

[0217] In the above technical solution, by setting the adapter 35 to include multiple stacked adapter foils 350, the number of adapter foils 350 and the structure and size of each adapter foil 350 can be flexibly set, so that the adapter 35 has a flexible structure and size design, which improves the applicability and practicality of the adapter 35, helps to reduce the difficulty of connecting with the pole body 21 and the pole tab assembly 33, and improves the ease of assembly.

[0218] Furthermore, since the overlapping areas of multiple adapter foils 350 are connected to form spaced first connecting portions 351 and second connecting portions 352, the opposing surfaces of two adjacent adapter foils 350 are connected, but not completely connected, which helps to reduce the processing steps of the adapter 35. Moreover, since the thickness of a single adapter foil 350 is smaller than the thickness of the adapter 35, multiple adapter foils 350 are equivalent to multiple thin plates. The adapter 35 formed by multiple adapter foils 350 is easier to bend than a one-piece adapter. At the same time, the rigidity of some areas of the adapter 35 is relatively small, which makes it easier for the adapter 35 to bend in the areas with lower rigidity during the assembly of the battery cell 102. Thus, the adapter 35 facilitates the soft connection between the tab assembly 33 and the terminal body 21, and the adapter 35 is bent into a certain shape during the assembly of the battery cell 102 to meet the design requirements. For example, multiple adapter foils 350 can be welded together at several key locations using methods such as ultrasonic welding to connect the multiple adapter foils 350 together.

[0219] Please refer to Figures 7 and 8. In some embodiments of this application, the adapter 35 forms a third connecting portion between the first connecting portion 351 and the second connecting portion 352, and the third connecting portion 354 is bent to connect the first connecting portion 351 and the second connecting portion 352.

[0220] It is understandable that in the portion of the third connecting part 354 corresponding to the multiple connecting foils 350 of the adapter 35, if two adjacent connecting foils 350 are not connected, the rigidity of the third connecting part 354 is less than that of the first connecting part 351 and the second connecting part 352. This facilitates bending at the third connecting part 354, so that when the structural shape of the adapter 35 changes during assembly, for example, if the third connecting part 354 is not bent before assembly but is bent after assembly to form a bent part 353, it improves the ease of assembly. In addition, the bent adapter 35 can play a buffer support role while reliably supporting the free end 331 of the electrode assembly 33, which helps to reduce the risk of the cell component 3 impacting the casing component 1 and improves the reliability of the battery cell 102.

[0221] Please refer to Figure 8. In some embodiments of this application, the plurality of adapter foils 350 include at least one first adapter foil 3501 and at least one second adapter foil 3502, wherein the first adapter foil 3501 and the second adapter foil 3502 are respectively connected to both sides of the thickness of the free end 331.

[0222] In the above technical solution, by setting the first adapter foil 3501 and the second adapter foil 3502 to be connected to both sides of the thickness of the free end 331 respectively, the free end 331 can be separated from the pressurizing device by the first adapter foil 3501 and the second adapter foil 3502, so as to protect the free end 331, reduce the risk of the tab 311 of the tab assembly 33 being prone to cracking due to its thinness, and improve the welding quality between the tab assembly 33 and the adapter 35, thereby improving the connection reliability between the tab assembly 33 and the adapter 35.

[0223] It is understandable that the number of the first adapter foil 3501 and the number of the second adapter foil 3502 may be equal or unequal, and the number of all adapter foils 350 of the adapter 35 may be odd or even.

[0224] For example, the plurality of adapter foils 350 include at least one first adapter foil 3501 and at least one second adapter foil 3502. The first adapter foil 3501 and the second adapter foil 3502 are respectively connected to both sides of the thickness of the free end 331. All the first adapter foils 3501 located on the same side of the thickness of the free end 331 can be configured into a clamping part 3561, and all the second adapter foils 3502 located on the same side of the thickness of the free end 331 can be configured into a clamping part 3561, which facilitates the forming of the clamping structure 356.

[0225] Please refer to Figures 10-14. In some embodiments, a plurality of battery cell bodies 32 arranged sequentially along the second direction constitute a battery cell group 32A. All free ends 331 of the battery cell group 32A extend toward the middle position of the battery cell group 32A in the second direction, and all free ends 331 of the battery cell group 32A are connected to form a first gathering part 332. The adapter 35 supports the first gathering part 332.

[0226] In this configuration, the middle position of the battery cell assembly 32A in the second direction can correspond to the convergence region R. In the second direction, the center of the convergence region R can be the center of the battery cell assembly 32A. All free ends 331 of the battery cell assembly 32A extend to the convergence region R. In the second direction, at least a portion of the first convergence portion 332 is located within the convergence region R.

[0227] It is understandable that for a single battery cell 102, its cell pack 32A can have one or more packs.

[0228] In the above technical solution, by setting multiple cell bodies 32 to form a cell group 32A, it is beneficial to improve the voltage and capacity of the battery cell 102. All free ends 331 of the cell group 32A extend towards the middle position of the cell group 32A in the second direction, which can reduce the offset of the closing position of the tab group 33 of the cell group 32A relative to the center of the cell group 32A in the second direction. Since the larger the offset, the longer the required length of the tab group 33, the above arrangement can reduce the length of the tab group 33, improve the redundancy of the tab group 33, and reduce the risk of reverse insertion. Moreover, the adapter 35 can support the first closing part 332 formed by connecting all the free ends 331 of the cell group 32A, which facilitates the electrical connection between all the cell bodies 32 of the cell group 32A and the terminal body 21, and helps to reduce the number of adapters 35 and simplify the structure of the battery cell 102.

[0229] Referring to Figures 10 and 11, in some embodiments, in the second direction, the midpoint of the cell assembly 32A in the second direction is taken as the midpoint of the central position, that is, the midpoint of the cell assembly 32A in the second direction is taken as the midpoint of the converging region R. The size of the central position is less than or equal to half the size of a single cell body 32. Therefore, the size of the converging region R in the second direction is less than or equal to half the size of a single cell body 32 in the second direction. Thus, while shortening the length of the tab assembly 33, it is easier to accommodate different assembly and usage requirements, which helps to reduce assembly requirements and improve the applicability and practicality of the battery cell 102.

[0230] For example, the size of the gathered area R in the second direction is 1 / 5, 1 / 4, 1 / 3 or 1 / 2 of the size of the cell body 32 in the second direction.

[0231] Please refer to Figures 11 and 14. In some embodiments, there are multiple sets of battery cells 32A, and the multiple sets of battery cells 32A are arranged sequentially along the second direction. The adapter 35 supports all the first gathering parts 332.

[0232] In the above technical solution, by setting up multiple sets of cell groups 32A, it is beneficial to further improve the voltage and capacity of the battery cell 102. The adapter 35 supports the first gathering part 332 of all cell groups 32A, which facilitates the electrical connection between all cell bodies 32 of cell group 32A and the terminal body 21, and also helps to further reduce the number of adapters 35 and simplify the structure of the battery cell 102.

[0233] Referring to Figures 11 and 14, in some embodiments, the adapter 35 includes a main structure 357 and a plurality of branch structures 358. The main structure 357 is connected to the pole body 21. Each branch structure 358 is connected to the end of the main structure 357 away from the pole body 21, and each branch structure 358 includes at least one first-level branch segment 3581, so that the adapter 35 is constructed into a fractal tree structure. Each last-level branch segment 3581 of the branch structure 358 supports a first gathering portion 332.

[0234] For example, each branch structure 358 includes a first-level branch segment 3581 to a p-th-level branch segment 3581 arranged sequentially from the portion of the adapter 35 connected to the pole body 21 toward the portion of the adapter 35 connected to the tab assembly 33. Each p-th-level branch segment 3581 supports a first gathering portion 332. The main body structure 357 is connected to multiple first-level branch segments 3581. Each upper-level branch segment 3581 is connected to multiple lower-level branch segments 3581. For example, each first-level branch segment 3581 is connected to multiple second-level branch segments 3581. Each (q-1)-th-level branch segment 3581 is connected to multiple q-th-level branch segments 3581, where p and q are positive integers. For example, referring to Figure 11, each branch structure 358 includes a first-level branch segment 3581, which supports the first gathering part 332; or, for another example, each branch structure 358 includes two-level branch segments 3581, namely a first-level branch segment 3581 and a second-level branch segment 3581, each first-level branch segment 3581 connecting multiple second-level branch segments 3581, and each second-level branch segment 3581 of the branch structure 358 supporting the first gathering part 332.

[0235] In the above technical solution, by setting the adapter 35 to construct a fractal tree structure, it is easy for the adapter 35 to realize the electrical connection between all the battery cell bodies 32 and the terminal body 21, and the adapter 35 can connect a larger number of battery cell bodies 32, while the space occupied by the adapter 35 is relatively small.

[0236] For example, the adapter 35 is constructed in a shaped tree structure, and the number of the battery cell body 32 of the battery cell 102 can be two, three, four, five, six, seven or eight, etc., and the thickness of the cell component 3 can be extended to a maximum of 120mm.

[0237] Please refer to Figure 11. In some embodiments, the adapter 35 includes a first connecting portion 351, a bending portion 353, and a second connecting portion 352. The first connecting portion 351 and the second connecting portion 352 are opposite to each other. The bending portion 353 is bent and connected between the first connecting portion 351 and the second connecting portion 352. At least a portion of the second connecting portion 352 is configured as a plurality of branch structures 358.

[0238] In the above technical solution, by setting a bending portion 353 to bend and connect between the first connecting portion 351 and the second connecting portion 352, and constructing at least a portion of the second connecting portion 352 into multiple branch structures 358, the second connecting portion 352 supports all the tab groups 33, realizing the electrical connection between all the tab groups 33 and the electrode post body 21. Moreover, the bent adapter 35 can play a buffer support role while reliably supporting the free end 331 of the tab group 33, which helps to reduce the risk of the cell component 3 hitting the shell component 1 and improve the reliability of the battery cell 102.

[0239] In the above technical solution, if a portion of the second connecting part 352 is configured as multiple branch structures 358, the boundary line between the main structure 357 and the branch structures 358 (or the connection position between the main structure 357 and the branch structures 358) is located on the second connecting part 352; if the second connecting part 352 is configured as multiple branch structures 358, the boundary line between the main structure 357 and the branch structures 358 can be located at the connection position between the second connecting part 352 and the bending part 353.

[0240] Please refer to Figure 11. In some embodiments, the connection position between the main structure 357 and the branch structure 358 is located at the middle position of all cell groups 32A in the second direction. The middle position of all cell groups 32A in the second direction may correspond to region R'. In the second direction, the center of region R' may be the center of all cell groups 32A. In the second direction, the connection position between the main structure 357 and the branch structure 358 is located within region R'.

[0241] In the above technical solution, by setting the connection position of the main structure 357 and the branch structure 358 to be located in the middle of all the battery cell groups 32A in the first direction, it is convenient to shorten the length of the branch structure 358 while ensuring that the branch structure 358 can reliably support the electrode group 33, which is beneficial to reduce the space occupied by the adapter 35.

[0242] Optionally, the dimension of region R' in the second direction is less than or equal to half the dimension of a cell body 32 in the second direction; but not limited thereto.

[0243] Please refer to Figures 10-14. In some embodiments, the number of cell bodies 32 in the cell assembly 32A is an odd or even number; and / or, the number of cell bodies 32 in multiple cell assemblies 32A may be equal or unequal. Therefore, the design of the cell assembly 32A is flexible, facilitating improvements in the applicability and practicality of the battery cell 102.

[0244] For example, referring to Figures 10 and 12, the cell group 32A is a group, and the cell group 32A includes two cell bodies 32 arranged along the first direction; for another example, the cell group 32A is a group, and the cell group 32A includes three cell bodies 32 arranged along the first direction; for yet another example, referring to Figure 13, the cell group 32A is a group, and the cell group 32A includes four cell bodies 32 arranged along the first direction; for yet another example, referring to Figures 11 and 14, the cell group 32A is two groups, and each group of cell group 32A includes four cell bodies 32 arranged along the first direction; for yet another example, the cell group 32A is two groups, one group includes three cell bodies 32, and the other group includes five cell bodies 32; for yet another example, the cell group 32A is two groups, one group includes one cell body 32, and the other group includes two cell bodies 32.

[0245] Please refer to Figures 15 and 16. In some embodiments of this application, the battery cell 102 further includes an insulating component 4. The insulating component 4 is disposed in the receiving cavity 13 and has a perforation 40. The insulating component 4 blocks the portion of the electrode assembly 33 and / or the adapter 35 that passes through the perforation 40 to the side of the insulating component 4 opposite to the cell body 32 from the cell body 32. The insulating component 4 blocks the portion of the electrode assembly 33 that passes through the perforation 40 to the side of the insulating component 4 opposite to the cell body 32 from the cell body 32, and / or the insulating component 4 blocks the portion of the adapter 35 that passes through the perforation 40 to the side of the insulating component 4 opposite to the cell body 32 from the cell body 32.

[0246] As can be seen, at least a portion of the insulating component 4 is disposed between the end of the connecting tab assembly 33 of the cell body 32 and the terminal body 21. The through hole 40 allows the tab assembly 33 and / or the adapter 35 to pass through, so that the tab assembly 33 and / or the adapter 35 can pass through to the side of the insulating component 4 away from the cell body 32 to electrically connect with the terminal body 21. Therefore, the insulating component 4 can be used to isolate the cell body 32 from the first shell wall 111 of the housing component 1, reducing the probability of the cell body 32 contacting the first shell wall 111 of the housing component 1. This reduces the risk of corrosion of the first shell wall 111 of the housing component 1 due to the cell body 32 being exposed, reduces the risk of cell body 32 failing, and reduces the risk of leakage, thereby improving the reliability and stability of the battery cell 102.

[0247] Furthermore, if a conductive part 4 is connected to the end of the cell body 32, and the conductive part 4 is electrically connected to the electrode body 21, the conductive part 4 includes a tab assembly 33 and an adapter 35. Since the insulating member 4 blocks the portion of the tab assembly 33 and / or the adapter 35 that passes through the perforation 40 to the side of the insulating member 4 opposite to the cell body 32 and the cell body 32, the insulating member 4 blocks the portion of the conductive part that passes through the perforation 40 to the side of the insulating member 4 opposite to the cell body 32 and the cell body 32. This separates the portion of the conductive part that passes through the insulating member 4 to the side of the insulating member 4 opposite to the cell body 32 from the cell body 32, reducing the probability that the conductive part will be inserted backwards into the cell body 32 due to redundancy, thereby reducing the risk of short circuit in the battery cell 102 and improving the reliability of the battery cell 102.

[0248] For example, if the tab assembly 33 passes through the through hole 40, and a portion of the tab assembly 33 passes through the through hole 40 to the side of the insulating member 4 away from the cell body 32, the adapter 35 can be entirely located on the side of the insulating member 4 away from the cell body 32 through the through hole 40. In this case, the insulating member 4 can block the portion of the tab assembly 33 passing through the insulating member 4 away from the cell body 32 from the cell body 32 and / or block the adapter 35 from the cell body 32. If the adapter 35 passes through the through hole 40, and a portion of the adapter 35 and the tab assembly 33 are located on the side of the insulating member 4 facing the cell body 32, and another portion of the adapter 35 is located on the side of the insulating member 4 away from the cell body 32, the insulating member 4 can block the other portion of the adapter 35 from the cell body 32.

[0249] Please refer to Figures 15 and 16. In some embodiments of this application, the insulating component 4 includes an insulating film 41. The insulating film 41 fully covers the cell body 32. The insulating film 41 covers all surfaces of the cell body 32, so that the insulating film 41 can isolate the outer surface of the cell body 32 from the housing component 1, reduce the risk of corrosion of the housing component 1 due to the cell body 32 being exposed, reduce the risk of failure of the cell body 32 itself, and reduce the risk of leakage, thereby improving the reliability and stability of the battery cell 102.

[0250] In this case, a perforation 40 is formed on the insulating film 41 at a position opposite to the first shell wall 111. The portion of the insulating film 41 surrounding the perforation 40 blocks the portion of the electrode assembly 33 that passes through the perforation 40 to the side of the insulating film 41 facing the electrode post body 21 and the cell body 32. The portion of the insulating film 41 surrounding the perforation 40 blocks the portion of the electrode assembly 33 that passes through the perforation 40 to the side of the insulating film 41 facing away from the cell body 32 and the cell body 32.

[0251] In the above technical solution, since the portion of the insulating film 41 surrounding the perforation 40 blocks the portion of the tab assembly 33 that passes through the perforation 40 to the side of the insulating film 41 facing the electrode post body 21 and the cell body 32, it facilitates the adaptation of the size of the perforation 40 on the insulating film 41 to the size of the tab assembly 33. For example, the size of the first clearance hole is adapted to the thickness of the portion of the tab assembly 33 located at the first clearance hole. On the one hand, this allows the tab assembly 33 to pass smoothly through the perforation 40 to make electrical connection with the electrode post body 21. On the other hand, it allows the tab assembly 33 to pass through smoothly to make electrical connection with the electrode post body 21. With the perforation 40 in place, the insulating film 41 can still cover the position of the multiple tabs 311 of the tab assembly 33 near the root of the cell body 32, further providing insulation protection for the cell body 32 and reducing the risk of the cell body 32 being exposed. At the same time, it can separate the part of the tab assembly 33 that passes through the perforation 40 from the cell body 32, reducing the probability of the tab assembly 33 and / or the adapter 35 being redundant and thus inserted upside down into the cell body 32, as well as the probability of the tab assembly 33 near the root of the cell body 32, which is conducive to further reducing the risk of short circuit in the battery cell 102.

[0252] In some examples, the perforations 40 on the insulating film 41 are normally open holes adapted to the size of the tab assembly 33. That is, when the insulating film 41 is in its natural state (the state where the insulating film 41 is not squeezed by the tab assembly 33), the size of the perforations 40 is greater than zero. This allows the tab assembly 33 to pass through the insulating film 41 quickly, which helps to improve the efficiency of the insulating film 41 in wrapping the cell body 32, thereby improving the assembly efficiency of the battery cell 102. Furthermore, during the process of the tab assembly 33 passing through the insulating film 41, it can avoid the insulating film 41, thereby reducing the probability of deformation of the tab assembly 33, reducing the number of shaping steps for the tab assembly 33, and further improving the assembly efficiency of the battery cell 102.

[0253] In some examples, the insulating film 41 is provided with a tearing structure 411 at the position opposite to the first shell wall 111. The tearing structure 411 is adapted to be torn by the tab assembly 33 to form a perforation 40. For example, during the process of covering the outer side of the battery cell body 32 with the insulating film 41, when the tab assembly 33 pushes open the tearing structure 411 on the insulating film 41, an openable perforation 40 can be formed on the insulating film 41, so that the tab assembly 33 can be smoothly inserted through the perforation 40. Since the perforation 40 has a self-closing characteristic, after the tab assembly 33 is inserted into place, the perforation 40 can gradually close, so that the insulating film 41 can cover at least a portion of the multiple tabs 311 of the tab assembly 33 near the root of the battery cell body 32.

[0254] Therefore, by setting the tearing structure 411, insulation protection can be formed on the roots of the multiple tabs 311 of the tab assembly 33 adjacent to the cell body 32, so that the part of the tab assembly 33 passing through the perforation 40 is separated from the roots of the multiple tabs 311 of the tab assembly 33 adjacent to the cell body 32. This reduces the probability of the tab assembly 33 being inserted into the cell body 32 due to redundancy, and the probability of the multiple tabs 311 of the tab assembly 33 being inserted into the roots of the cell body 32 adjacent to the cell body 32, thereby reducing the risk of short circuit in the battery cell 102.

[0255] Please refer to Figures 17-20. In some embodiments of this application, the insulating component 4 includes an insulating support 42. The insulating support 42 is disposed on the side of the cell body 32 facing the first shell wall 111. The insulating support 42 facilitates the support of the cell body 32 and separates the cell body 32 from the first shell wall 111, reducing the probability of the cell body 32 contacting the first shell wall 111. This helps to reduce the risk of corrosion of the first shell wall 111 due to leakage of the cell body 32, reduce the risk of leakage, and improve the reliability and stability of the battery cell 102.

[0256] In this case, the insulating bracket 42 has a perforation 40 at the position opposite to the pole piece 2. The part of the insulating bracket 42 surrounding the perforation 40 is blocked between the adapter 35 and the cell body 32. At this time, the adapter 35 can be located on the side of the insulating bracket 42 away from the cell body 32. The tab assembly 33 passes through the perforation 40 on the insulating bracket 42.

[0257] In the above technical solution, since the portion of the insulating bracket 42 surrounding the perforation 40 is blocked between the adapter 35 and the cell body 32, the insulating bracket 42 can provide a certain support for the adapter 35. Since the adapter 35 supports the free end 331 of the tab assembly 33, the insulating bracket 42 can insulate and separate the free end 331 of the tab assembly 33 from the cell body 32, reducing the probability of the free end 331 of the tab assembly 33 being inserted into the cell body 32 or into the root of the adjacent cell body 32, reducing the risk of short circuit and improving the reliability of the battery cell 102.

[0258] Furthermore, since the end of the insulating bracket 42 and the adapter 35 facing the cell body 32 abuts against each other, the insulating bracket 42 can indirectly support the free end 331 of the tab assembly 33 through the adapter 35. This can improve the reliability of supporting the free end 331 of the tab assembly 33, further reduce the probability of the tab assembly 33 being inserted into the cell body 32 or into the root of the adjacent cell body 32, reduce the risk of short circuit, and improve the reliability of the battery cell 102.

[0259] Please refer to Figures 17 and 18. In some embodiments of this application, the insulating component 4 includes an insulating support 42. The perforation 40 on the insulating support 42 has a first hole wall and a second hole wall disposed opposite to each other in the width direction of the electrode body 21. The insulating support 42 includes a support body 421 and a first partition plate 422. The support body 421 is disposed at one end of the cell body 32 facing the first shell wall 111. The first partition plate 422 is disposed at the first hole wall and is connected to the support body 421. The first partition plate 422 extends toward the center of the perforation 40 and blocks the connection between the adapter 35 and the cell body 32. In this case, the insulating support 42 does not include the second partition plate 423 described below.

[0260] It is understood that the first separator 422 may be parallel to the width direction of the pole body 21 or inclined relative to the width direction of the pole body 21.

[0261] Referring to Figures 19 and 20, in some embodiments of this application, the insulating component 4 includes an insulating support 42. The perforation 40 on the insulating support 42 has a first hole wall and a second hole wall disposed opposite each other in the width direction of the electrode body 21. The insulating support 42 includes a support body 421, a first partition plate 422, and a second partition plate 423. The support body 421 is located at one end of the cell body 32 facing the first shell wall 111. The first partition plate 422 is located at the first hole wall and is connected to the support body 421. The first partition plate 422 extends towards the center of the perforation 40 and blocks the connection between the adapter 35 and the cell body 32. The second partition plate 423 is located at the second hole wall and is connected to the support body 421. The second partition plate 423 extends towards the center of the perforation 40. It can be seen that the first partition plate 422 and the second partition plate 423 are spaced apart to form the perforation 40 between them.

[0262] It is understood that the second separator 423 may be parallel to the width direction of the pole body 21 or inclined relative to the width direction of the pole body 21.

[0263] In some embodiments of this application, the insulating component 4 includes an insulating film 41 and an insulating support 42. The insulating film 41 fully covers the battery cell body 32. A perforation 40 is formed on the insulating film 41 at a position opposite to the first shell wall 111. The portion of the insulating film 41 surrounding the perforation 40 blocks the portion of the electrode assembly 33 that passes through the perforation 40 to the side of the insulating film 41 facing the electrode post body 21 and the battery cell body 32. The insulating support 42 is disposed on the side of the battery cell body 32 facing the first shell wall 111. A perforation 40 is formed on the insulating support 42 at a position opposite to the electrode post component 2. The portion of the insulating support 42 surrounding the perforation 40 blocks the connection member 35 and the battery cell body 32. The perforation 40 on the insulating support 42 and the perforation 40 on the insulating film 41 can be arranged opposite each other. The insulating support 42 can cover at least a portion of the insulating film 41 on the end of the battery cell body 32 facing the first shell wall 111.

[0264] An insulating material is provided between the pole body 21 and the first shell wall 111 to achieve insulation between the first shell wall 111 and the pole body 21. For example, the insulating material can be part of the pole component 2 (e.g., insulating structure 23), or the insulating material can be provided between the pole component 2 and the shell component 1.

[0265] Please refer to Figures 21-24. In some embodiments of this application, the pole piece 2 further includes a transition structure 22 and an insulating structure 23. The transition structure 22 surrounds the pole piece body 21 and is connected to the first shell wall 111. The insulating structure 23 is insulated between the transition structure 22 and the pole piece body 21.

[0266] The adapter structure 22 surrounds the entire circumference of the pole body 21 along the mounting hole 112, thereby connecting the pole body 21 and the first shell wall 111 in the outer peripheral area of ​​the pole body 21. The insulating structure 23 insulates the mating position between the adapter structure 22 and the pole body 21, preventing short circuits between the pole body 21 and the adapter structure 22. The connection method between the adapter structure 22 and the first shell wall 111 is not limited; for example, it can be welded, riveted, drilled, or glued.

[0267] In the above technical solution, the pole piece 2 has a simple structure and is easy to process. Since it includes two parts, the pole piece body 21 and the adapter structure 22, the shape and size of the pole piece body 21 and the adapter structure 22 can be designed separately based on different factors to flexibly adapt to the connection requirements of different types of housing parts 1 and battery cell parts 3, thereby increasing the applicability of the pole piece 2.

[0268] For example, the adapter structure 22 can be configured to match the shape of the mounting hole 112. The shape of the mounting hole 112 can be designed as an elongated shape that facilitates the passage of the pole piece 2 and minimizes the rotation angle of the pole piece 2. At the same time, the pole piece body 21 can be designed as an elongated shape that matches the shape of the adapter structure 22, so that the pole piece body 21 has a larger area to connect with the adapter 35. Alternatively, the pole piece body 21 can be designed as a circle that does not match the shape of the adapter structure 22, thereby reducing the connection area between the pole piece body 21 and the adapter structure 22, improving the uniformity of force at the connection between the pole piece body 21 and the adapter structure 22, and thus improving the connection reliability between the pole piece body 21 and the adapter structure 22.

[0269] For example, the adapter structure 22 is formed as an elongated strip (such as a rectangle or racetrack shape) extending along the length direction of the first shell wall 111, and the outline shape of the electrode body 21 matches the outline shape of the adapter structure 22 (such as a rectangle or racetrack shape). As mentioned above, the cell component 3 is connected to the electrode component 2 through the conductive part 4. When the outline shape of the electrode body 21 is formed as an elongated strip that matches the outline shape of the adapter structure 22, the area of ​​the electrode body 21 is larger, which is beneficial to increasing the connection area between the adapter 35 and the electrode body 21, thereby improving the conductivity.

[0270] For example, when the terminal component 2 includes the aforementioned terminal body 21, adapter structure 22 and insulation structure 23, during the assembly of the battery cell 102, "connecting the cell component 3 to the terminal component 2" may specifically include: connecting the cell component 3 to the terminal body 21; setting the terminal component 2 connected to the cell component 3 at the mounting hole 112; and connecting the adapter structure 22 to the first shell wall 111.

[0271] Please refer to Figures 21-24. In some embodiments of this application, the insulating structure 23 is also sealed between the adapter structure 22 and the terminal body 21. Therefore, the insulating structure 23 not only insulates the adapter structure 22 from the terminal body 21, but also seals the mating position between the adapter structure 22 and the terminal body 21. This isolates the inside and outside of the housing component 1 after the adapter structure 22 is connected to the first housing wall 111, reducing the risk of electrolyte leakage from the mating position between the adapter structure 22 and the terminal body 21 to the outside of the housing component 1, and reducing the risk of liquids or dust from outside the housing component 1 entering the housing component 1 from the mating position between the adapter structure 22 and the terminal body 21, thereby improving the reliability of the battery cell 102.

[0272] In the above technical solution, since the insulating structure 23 is also sealed between the transition structure 22 and the pole body 21, when installing the pole component 2 onto the first shell wall 111 and connecting the transition structure 22 and the first shell wall 111, there is no need to install a seal between the transition structure 22 and the first shell wall 111. This eliminates the need to apply a large sealing pressure to meet the compression requirements of the seal, thereby reducing the stress on the first shell wall 111 and protecting the shell component 1. This helps to reduce the wall thickness of the shell component 1 and lower material costs. Furthermore, since the first shell wall 111 is the end opposite the shell body 11 and the opening 113, the stress at the connection between the first shell wall 111 and the second shell wall 114, as well as the stress on the second shell wall 114, can be reduced. This helps to ensure the reliability of the shell body 11 and lower the wall thickness and cost of the shell body 11.

[0273] Please refer again to Figures 21-24. In some embodiments of this application, the insulating structure 23 includes a sealing structure 231. In the embodiments of this application, the sealing structure 231 is made of a material that has both sealing and insulating properties, such as an elastic rubber component.

[0274] Please refer again to Figures 21-24. By way of example, at least a portion of the sealing structure 231 is clamped between the transition structure 22 and the pole body 21 in the inward and outward directions (e.g., the fifth direction) of the first shell wall 111.

[0275] In the embodiments of this application, the directions from the inner side to the outer side of the first shell wall 111, and the directions from the outer side to the inner side of the first shell wall 111, are collectively referred to as the "inner and outer directions of the first shell wall 111 (e.g., the fifth direction)". The "inner side of the first shell wall 111" refers to the side of the first shell wall 111 facing the cell component 3, and the "outer side of the first shell wall 111" refers to the side of the first shell wall 111 away from the cell component 3.

[0276] The sealing structure 231 includes at least a axial side portion 231a. The side of the axial side portion 231a facing the receiving cavity 13 is the inner side of the axial side portion 231a, and the side of the axial side portion 231a away from the cell component 3 is the outer side of the axial side portion 231a. One of the transition structure 22 and the electrode body 21 is partially clamped on the outer side of the axial side portion 231a, and the other is partially clamped on the inner side of the axial side portion 231a. Thus, the axial side portion 231a is clamped between the transition structure 22 and the electrode body 21 in the inward and outward directions (e.g., the fifth direction F5) of the first shell wall 111 to achieve an axial seal between the transition structure 22 and the electrode body 21.

[0277] Therefore, by providing at least a portion of the sealing structure 231 sandwiched between the transition structure 22 and the pole body 21 in the inward and outward directions (e.g., the fifth direction F5) of the first shell wall 111, an axial seal is achieved between the transition structure 22 and the pole body 21. This axial seal provides a more reliable sealing effect and improves the leakage problem at the mating position of the transition structure 22 and the pole body 21. Furthermore, by integrating the axial seal (such as the axial side portion 231a) into the pole component, the axial force on the first shell wall 111 can be reduced in the embodiments of this application.

[0278] Please refer again to Figures 21-24. Exemplarily, the sealing structure 231 is circumferentially disposed on the side of the transition structure 22 facing the pole body 21 (i.e., the inner ring of the transition structure 22). In the embodiments of this application, since the transition structure 22 is arranged around the pole body 21 and connected to the first shell wall 111, the side of the transition structure 22 facing the pole body 21 is the "inner ring 2211 of the transition structure 22," and the side of the transition structure 22 facing the first shell wall 111 is the "outer ring 2212 of the transition structure 22." In the above technical solution, by circumferentially disposing the sealing structure 231 on the inner ring of the transition structure 22, the sealing structure 231 can approach the mating position between the transition structure 22 and the pole body 21. This facilitates sealing the mating position between the transition structure 22 and the pole body 21 via a shorter path, improving the reliability of the seal. Furthermore, it helps to reduce the size of the sealing structure 231, reduce the sealing area, and easily achieve compression sealing, making the seal less prone to failure and improving the sealing effect.

[0279] Furthermore, when the insulating structure 23 includes a sealing structure 231, which is sandwiched between the transition structure 22 and the pole body 21 to achieve a sealed fit between the transition structure 22 and the pole body 21, and the transition structure 22 is formed as an elongated strip extending along the length direction of the first shell wall 111, and the pole body 21 is located at the center of the length of the transition structure 22 and is circular, the force at the connection position between the transition structure 22 and the pole body 21 is uniform, making it easy to control the compression of the sealing structure 231, thereby improving the reliability of the sealed fit between the transition structure 22 and the pole body 21. Moreover, the sealing area is relatively small, making it less prone to failure.

[0280] Please refer again to Figures 21-24. In some embodiments of this application, the pole body 21 includes a peripheral portion 212. The adapter structure 22 is clamped on both sides of the peripheral portion 212 in the inward and outward directions of the first shell wall 111 by the insulating structure 23. At least a portion of the sealing structure 231 is clamped between the side of the peripheral portion 212 facing the cell component 3 and the adapter structure 22.

[0281] In this embodiment, the peripheral portion 212 can be the outer peripheral structure of the pole body 21. Since the sealing structure 231 is arranged around the periphery of the transition structure 22 facing the pole body 21, the sealing structure 231 can be clamped between the peripheral portion 212 and the transition structure 22.

[0282] In this embodiment, the side of the peripheral portion 212 facing away from the cell component 3 is the outer side of the peripheral portion 212, and the side of the peripheral portion 212 facing the receiving cavity 13 is the inner side of the peripheral portion 212. The transition structure 22 is limited to the outer side of the peripheral portion 212 by the insulating structure 23 to restrict the movement of the electrode body 21 relative to the transition structure 22 in the direction away from the cell component 3. The transition structure 22 is also limited to the inner side of the peripheral portion 212 by the insulating structure 23 to restrict the movement of the electrode body 21 relative to the transition structure 22 in the direction towards the receiving cavity 13. Thus, the transition structure 22 is clamped on both sides of the peripheral portion 212 by the insulating structure 23 in the inner and outer directions (e.g., the fifth direction F5) of the first shell wall 111.

[0283] In the above technical solution, the electrode post component 2 has a simple structure and is easy to process, which can easily and effectively achieve the relative fixation and insulating fit between the electrode post body 21 and the adapter structure 22. The sealing structure component 231 is clamped between the peripheral portion 212 of the electrode post body 21 and the adapter structure 22, so that the sealing structure component 231 can be positioned at the mating position between the adapter structure 22 and the electrode post body 21. This facilitates sealing at the mating position of the adapter structure 22 and the electrode post body 21 with a shorter path, improving the reliability of the seal. It also helps to reduce the size of the sealing structure component 231, reduce the sealing area, and facilitate compression sealing, making the seal less prone to failure and improving the sealing effect. Furthermore, since at least a portion of the sealing structure component 231 is clamped between the peripheral portion 212 facing the cell component 3 and the adapter structure 22, the sealing structure component 231 can seal from the peripheral portion 212 facing the receiving cavity 13, which can more effectively suppress electrolyte leakage from the mating position between the electrode post body 21 and the adapter structure 22, thereby improving the sealing effect.

[0284] Referring again to Figure 24, exemplarily, the insulating structure 23 further includes a first insulating member 232. The transition structure 22 is clamped to both sides of the peripheral portion 212 along the inward and outward directions (e.g., the fifth direction F5) of the first shell wall 111 via the first insulating member 232 and the sealing structure member 231. In this embodiment, the configuration of the transition structure 22 is not limited; it can be a single component or a combination of multiple components (e.g., two or more).

[0285] Since at least a portion of the sealing structure 231 (such as the axial portion 231a) is located on the side of the peripheral portion 212 facing the cell component 3, at least a portion of the first insulating member 232 is located on the side of the peripheral portion 212 away from the cell component 3. The transition structure 22 can be clamped on both sides of the peripheral portion 212 along the inner and outer directions (e.g., the fifth direction F5) of the first shell wall 111 by the first insulating member 232 and the sealing structure 231 respectively.

[0286] In the above technical solution, since the insulation structure 23 includes a first insulating component 232 and a sealing structure component 231 that are not integrated into a single piece, the design and processing of the insulation structure 23 can be simplified. Furthermore, depending on the specific requirements for cooperation with the pole body 21 and the adapter structure 22, the first insulating component 232 can be set as a basically incompressible insulating component without sealing effect (e.g., a plastic component), or it can be set as a compressible sealing component with sealing effect (e.g., an elastic rubber component), thereby meeting different practical requirements. In addition, when the first insulating component 232 is a basically incompressible insulating component without sealing effect (e.g., a plastic component), the compression amount of the sealing structure component 231 is easily controlled, improving the sealing effect.

[0287] Alternatively, in some other embodiments of this application, the sealing structure 231 can also be an integral structure with an outer periphery 212, located on the side of the periphery 212 facing the battery cell component 3 and the side facing away from the battery cell component 3, respectively. The transition structure 22 can be clamped on both sides of the periphery 212 by the sealing structure 231 along the inner and outer directions (e.g., the fifth direction F5) of the first shell wall 111. That is, the sealing structure 231 is an integral annular structure, which has both insulation and sealing properties. The sealing structure 231 includes axial side portions 231a located on the inner and outer sides of the periphery 212, respectively. In this way, the transition structure 22 can be clamped on both sides of the periphery 212 along the inner and outer directions (e.g., the fifth direction F5) of the first shell wall 111 by the two axial side portions 231a of the sealing structure 231. In the above technical solution, since the sealing structure 231 is an integral structure with an outer periphery 212, the number of parts can be reduced and the assembly process can be reduced.

[0288] Please refer again to Figures 21-24. In some embodiments of this application, the adapter structure 22 includes a first adapter ring 221 and a second adapter ring 222. The second adapter ring 222 is disposed on the side of the first adapter ring 221 away from the battery cell component 3. The second adapter ring 222 is connected to the first adapter ring 221, and the first adapter ring 221 is connected to the first shell wall 111. The sealing structure 231 is clamped between the first adapter ring 221 and the peripheral portion 212. The second adapter ring 222 is insulated from and fixedly fitted to the peripheral portion 212 by the first insulating member 232.

[0289] For example, the first adapter ring 221 and the second adapter ring 222 can be welded, riveted, drilled, or bonded together. For instance, the outer ring of one of the first adapter rings 221 and 222 can be welded, riveted, drilled, or bonded to the first shell wall 111. Exemplarily, both the first adapter ring 221 and the second adapter ring 222 are made of aluminum and welded together, and both the first adapter ring 221 and the first shell wall 111 are made of aluminum and welded together, which helps to improve the welding yield.

[0290] Therefore, the adapter structure 22 includes a first adapter ring 221 and a second adapter ring 222 that are arranged internally and externally and assembled together, which facilitates the assembly and connection of the adapter structure 22 with the insulation structure 23 and the pole body 21, making the pole component 2 easy to process and manufacture, and making it easy to control the compression of the sealing structure 231, thereby improving the sealing reliability.

[0291] The method by which the second adapter ring 222 is insulated from and fixedly fitted to the peripheral portion 212 by the first insulating member 232 is not limited. For example, referring again to Figures 21-24, the first insulating member 232 and the second adapter ring 222 can be injection molded separately. As another example, referring to Figure 25, which is a cross-sectional view of the pole post component provided in some embodiments of this application, the second adapter ring 222 may include a stop ring portion 2221, and at least a portion of the first insulating member 232 is clamped between the stop ring portion 2221 and the peripheral portion 212 along the inward and outward directions (e.g., the fifth direction F5) of the first shell wall 111. The material of the first insulating member 232 is not limited, and it can be, for example, a plastic part or an elastic rubber part.

[0292] Referring again to Figure 24, the adapter structure 22, by way of example, further includes a first insulating frame 224, which is connected to the side of the first adapter ring 221 facing the cell component 3. Thus, the first insulating frame 224 can serve as insulation between the cell component 3 and the first adapter ring 221, reducing the difficulty of setting up the insulation structure here. By way of example, the first insulating frame 224 has a pin, and the first adapter ring 221 has a hole; the pin is interference-fitted into the hole to achieve the connection between the first insulating frame 224 and the first adapter ring 221.

[0293] Please refer to Figure 26, which is a cross-sectional view of the pole member provided in some embodiments of this application. In some embodiments of this application, the adapter structure 22 includes a third adapter ring 223, which includes an integrally formed inner extension 2231 and an outer extension 2232. That is, the inner extension 2231 and the outer extension 2232 are different parts of a single integral piece, rather than two separate parts that are assembled together.

[0294] The inner extension 2231, facing the pole body 21 (i.e., the inner ring of the inner extension 2231), and the outer extension 2232, facing the pole body 21 (i.e., the inner ring of the outer extension 2232), are spaced apart in the inner and outer directions, respectively, by the insulating structure 23 along the inner and outer directions (e.g., the fifth direction F5) of the first shell wall 111, and clamped on both sides of the peripheral portion 212. The sealing structure 231 is clamped between the inner extension 2231 and the peripheral portion 212, and the outer extension 2232 is insulated from and fixedly fitted to the peripheral portion 212 by the first insulating member 232.

[0295] The connection method between the third adapter ring 223 and the first shell wall 111 is not limited; for example, it can be welded, riveted, drilled, or bonded. For example, both the third adapter ring 223 and the first shell wall 111 are made of aluminum and are welded together, which helps to improve the welding yield.

[0296] The method by which the outer extension 2232 is insulated from and fixedly engaged with the peripheral portion 212 by the first insulating member 232 is not limited. For example, referring again to FIG26, the outer extension 2232 rivets the first insulating member 232 against the peripheral portion 212. As another example, referring to FIG27, FIG27 is a cross-sectional view of the pole post component provided in some embodiments of this application; the first insulating member 232 and the pole post body 21, as well as the first insulating member 232 and the outer extension 2232 are respectively injection molded, and the inner extension 2231 rivets the sealing structure member 231 against the peripheral portion 212.

[0297] Referring again to Figure 27, the adapter structure 22 further includes a second insulating frame 225, which is connected to the side of the third adapter ring 223 facing the cell component 3. Thus, the second insulating frame 225 can serve as insulation between the cell component 3 and the third adapter ring 223, eliminating the need for a separate insulation structure. Exemplarily, the second insulating frame 225 has a pin, and the third adapter ring 223 has a socket; the pin is interference-fitted into the socket to connect the second insulating frame 225 and the third adapter ring 223.

[0298] Please refer to Figures 28-29. In some embodiments of this application, the adapter structure 22 includes a mating ring portion 2271, the pole body 21 includes a through portion 214 passing through the mating ring portion 2271, and an inner limiting portion 215 and an outer limiting portion 216 connected to the through portion 214 and clamped on the inner and outer sides of the mating ring portion 2271. At least a portion of the sealing structure 231 is clamped between the mating ring portion 2271 and the inner limiting portion 215.

[0299] For example, the adapter structure 22 includes a fourth adapter ring 227, which includes a mating ring portion 2271 and is connected to the first shell wall 111, for example, the outer ring of the fourth adapter ring 227 is connected to the first shell wall 111. The connection method between the fourth adapter ring 227 and the first shell wall 111 is not limited; for example, it can be welded, riveted, drilled, glued, etc. For example, both the fourth adapter ring 227 and the first shell wall 111 are made of aluminum and are welded together, which helps to improve the welding yield.

[0300] In the above technical solution, the electrode post component 2 has a simple structure and is easy to process, which can easily and effectively achieve the relative fixation and insulating fit between the electrode post body 21 and the adapter structure 22. The sealing structure 231 is clamped by the mating position between the electrode post body 21 and the mating ring 2271, so that the sealing structure 231 can be positioned at the mating position between the adapter structure 22 and the electrode post body 21. This facilitates sealing at the mating position between the adapter structure 22 and the electrode post body 21 with a shorter path, improving the reliability of the seal. It also helps to reduce the size of the sealing structure 231, reduce the sealing area, and facilitate compression sealing, making the seal less prone to failure and improving the sealing effect. Furthermore, since at least a portion of the sealing structure 231 is clamped between the mating ring 2271 and the inner limiting part 215, the sealing structure 231 can seal from the side of the mating ring 2271 facing the receiving cavity 13, which can more effectively suppress electrolyte leakage from the mating position between the electrode post body 21 and the adapter structure 22, thereby improving the sealing effect.

[0301] Please refer again to Figure 28. The insulating structure 23 may also include a second insulating member 234, wherein at least a portion of the sealing structure 231 is clamped between the inner limiting portion 215 and the mating ring portion 2271, and at least a portion of the second insulating member 234 is clamped between the outer limiting portion 216 and the mating ring portion 2271.

[0302] In the above technical solution, since the insulation structure 23 includes a second insulating component 234 and a sealing structure component 231 that are not integrated into a single piece, the design and processing of the insulation structure 23 can be simplified. Furthermore, depending on the specific requirements for cooperation with the pole body 21 and the adapter structure 22, the second insulating component 234 can be set as a basically incompressible insulating component without sealing effect (e.g., a plastic component), or it can be set as a compressible sealing component with sealing effect (e.g., an elastic rubber component), thereby meeting different practical requirements. In addition, when the second insulating component 234 is a basically incompressible insulating component without sealing effect (e.g., a plastic component), the compression amount of the sealing structure component 231 is easily controlled, improving the sealing effect.

[0303] Alternatively, referring to Figure 29; in some other embodiments of this application, the sealing structure 231 can also be an integral structure with a mating ring 2271 surrounding it, located on the side of the mating ring 2271 facing the battery cell component 3 and the side facing away from the battery cell component 3, respectively. The electrode body 21 is clamped on both sides of the mating ring 2271 by the sealing structure 231 along the inner and outer directions (e.g., the fifth direction F5) of the first shell wall 111. That is, the sealing structure 231 is an integral ring structure, which has both insulation and sealing properties. The sealing structure 231 includes axial side portions 231a located on the inner and outer sides of the mating ring 2271, respectively. In this way, the transition structure 22 can be clamped on both sides of the mating ring 2271 along the inner and outer directions (e.g., the fifth direction F5) of the first shell wall 111 by the two axial side portions 231a of the sealing structure 231. In the above technical solution, since the sealing structure 231 is an integral structure and surrounds the mating ring 2271, the number of parts and assembly steps can be reduced.

[0304] In the embodiments of this application, when the pole body 21 includes a through portion 214, and an inner limiting portion 215 and an outer limiting portion 216 connected to the through portion 214 and clamped on both sides of the mating ring portion 2271, the configuration of the pole body 21 is not limited. It can be a single part or a combination of multiple parts (such as two or more).

[0305] For example, referring again to Figure 28, the outer limiting part 216 and the through part 214 are assembled and connected on the side of the mating ring 2271 opposite to the inner limiting part 215. The assembly and connection method of the outer limiting part 216 and the through part 214 is not limited; for example, welding, drilling, adhesive bonding, etc., are all acceptable. Assembly connection refers to the connection of two parts together through a connection process. Therefore, by setting the outer limiting part 216 and the through part 214 as separate parts and assembling them, the structure of the pole body 21 is simple and easy to assemble and connect with the transition structure 22. Furthermore, when the outer limiting part 216 and the through part 214 are welded, the thermal impact on the sealing structure 231 clamped between the inner limiting part 215 and the mating ring 227 can be reduced, improving the sealing reliability of the sealing structure 231.

[0306] In the above embodiments, the connection method between the through-hole portion 214 and the inner limiting portion 215 is not limited; they can be an integral part or separate parts pre-connected together. For example, the end of the through-hole portion 214 facing away from the inner limiting portion 215 may include a riveting portion 2141. During assembly, the through-hole portion 214 can be inserted through the mating ring portion 2271 fitted with the insulating structure 23 along the direction from the inner limiting portion 215 to the outer limiting portion 216. Then, the riveting portion 2141 is riveted to restrict the through-hole portion 214 from disengaging along the direction from the outer limiting portion 216 to the inner limiting portion 215. Afterward, the riveting portion 2141 and the outer limiting portion 216 can be connected, facilitating the connection between the through-hole portion 214 and the outer limiting portion 216, for example, by welding. Alternatively, the riveting portion 2141 can be omitted, eliminating the riveting process after the through-hole portion 214 is inserted.

[0307] For example, please refer again to Figure 29; in some other embodiments of this application, the outer limiting part 216 and the through part 214 are integral parts, and the outer limiting part 216 rivets the second insulating member 234 against the mating ring part 2271. In the above technical solution, the assembly connection between the outer limiting part 216 and the insulating structure 23 and the transition structure 22 is achieved by riveting, which reduces the thermal impact of the heat generated when the outer limiting part 216 is connected to the insulating structure 23 and the transition structure 22 on the sealing structure member 231, and improves the sealing reliability of the sealing structure member 231. In addition, by riveting the outer limiting part 216 to press the second insulating member 234 against the mating ring part 2271, the compression amount of the sealing structure member 231 can be easily controlled, achieving a better compression effect.

[0308] In the above embodiments, the connection method between the through-hole portion 214 and the inner limiting portion 215 is not limited; they can be an integral part or separate parts pre-connected together. For example, during assembly, the through-hole portion 214 can be threaded through the mating ring portion 2271 fitted with the insulating structure 23 along the direction from the inner limiting portion 215 to the outer limiting portion 216, and then the outer limiting portion 216 can be riveted to restrict the relative movement between the pole member 21 and the transition structure 22.

[0309] The pole body 21 can be a solid structure or a hollow structure. For example, when the pole body 21 is a hollow structure, please refer to Figure 29; the pole body 21 includes a first pole member 21a and a second pole member 21b. The second pole member 21b is composed of a through part 214, an inner limiting part 215 and an outer limiting part 216, and is installed on the first shell wall 111. The through-hole 214 surrounds the first shell wall 111 and extends through the inner and outer directions of the mating hole 21b1. The first electrode 21a is assembled on the side of the second electrode 21b away from the cell component 3 and covers the mating hole 21b1, so as to form an open receiving space between the first electrode 21a and the second electrode 21b in the direction of the cell component 3. A portion of the conductive part 4 can extend into the receiving space and connect to the first electrode 21a, so that the electrode body 21 can play the role of storing the conductive part 4, thereby reducing the space occupied by the conductive part 4 in the receiving cavity 13 and improving the energy density of the battery cell 102.

[0310] Referring again to Figure 28, in some embodiments of this application, the adapter structure 22 further includes a third insulating frame 228, which is connected to the side of the fourth adapter ring 227 facing the cell component 3. Thus, the third insulating frame 228 can serve as insulation between the cell component 3 and the fourth adapter ring 227, eliminating the need for a separate insulating structure. Exemplarily, the third insulating frame 228 has a pin, and the fourth adapter ring 227 has a socket; the pin is interference-fitted into the socket to connect the third insulating frame 228 and the fourth adapter ring 227.

[0311] Please refer to Figure 30. In some embodiments of this application, the first shell wall 111 has a mounting hole 112, and a sealing ring 14 is provided around the mounting hole 112. The sealing ring 14 is clamped between the pole post component 2 and the first shell wall 111. Thus, the pole post component 2 has a simple structure, is easy to process, and is easy to assemble and connect with the first shell wall 111.

[0312] In some embodiments of this application, the first shell wall 111 has a mounting hole 112, the pole post component 2 is covered by the mounting hole 112, and the edge of the transition structure 22 overlaps with one side of the wall thickness direction of the first shell wall 111. In this way, by covering one side of the wall thickness direction of the first shell wall 111, that is, covering the outside of the first shell wall 111, or covering the inside of the first shell wall 111, the assembly of the transition structure 22 and the first shell wall 111 is facilitated.

[0313] Exemplarily, the adapter structure 22 is welded to the first shell wall 111. For example, after the adapter structure 22 is placed on the first shell wall 111, the adapter structure 22 and the first shell wall 111 can be connected by welding, which facilitates processing and can better ensure the reliability of the connection between the adapter structure 22 and the first shell wall 111. For example, welding can be performed from the outside of the first shell wall 111 so that the weld formed by the connection is exposed on the side of the first shell wall 111 away from the cell component 3 (i.e., the side away from the cell body 32), which facilitates welding operations and increases the welding space. This application is not limited to this. For example, in some other embodiments of this application, the adapter structure 22 can also be configured to pass through the mounting hole 112 and be riveted to the first shell wall 111, etc.

[0314] Please refer to Figures 31 and 32. In Figure 31, the pole post component 2 is in the state before it is covered by the first shell wall 111; Figure 32 is a diagram showing the state after the pole post component 2 shown in Figure 31 is covered by the first shell wall 111.

[0315] Referring to Figures 31 and 32, in some embodiments, when the cell component 3 is connected to the terminal component 2 first, and then the terminal component 2 is assembled and connected to the first housing wall 111, the terminal component 2 can be placed on the mounting hole 112 of the first housing wall 111 from the outside of the first housing wall 111 (i.e., the side away from the cell body 32) after the cell component 3 and the terminal component 2 are connected (for example, the terminal component 2 and the cell component 3 can be connected first, then installed together into the housing 11, and then the terminal component 2 can be extended from the mounting hole 112 to the outside of the first housing wall 111; or, for example, the cell component 3 is installed into the housing 11, the conductive part 4 passes through the mounting hole 112, and is connected to the terminal component 2 that is pre-set on the outside of the first housing wall 111). At this time, the edge of the adapter structure 22 overlaps the side of the first housing wall 111 away from the cell component 3. Therefore, since the pole post 2 is covered by the first housing wall 111 from the outside, it is convenient to assemble and connect the pole post 2 with the first housing wall 111, which helps to improve the connection reliability between the pole post 2 and the first housing wall 111.

[0316] Referring to Figures 31 and 32, in some embodiments of this application, when the edge of the adapter structure 22 overlaps with the side of the first shell wall 111 facing away from the battery cell component 3, a first recess 1111 surrounding the mounting hole 112 can be provided on the first shell wall 111. The first recess 1111 is open in the direction facing away from the battery cell component 3 (that is, the first recess 1111 is open in the direction facing away from the battery cell body 32). The edge of the adapter structure 22 is embedded in the first recess 1111, wherein the edge of the adapter structure 22 has a flange portion 22a surrounding the adapter structure 22, and the flange portion 22a is embedded in the first recess 1111. This facilitates the support and positioning of the connection between the adapter structure 22 and the first shell wall 111, and is beneficial for the two to be welded together from the outside of the first shell wall 111 (that is, the side facing away from the battery cell body 32).

[0317] Referring again to Figures 31 and 32, exemplarily, the thickness of the flange portion 22a matches the groove depth T1 of the first groove 1111. Here, "matching" means that the thickness of the flange portion 22a and the groove depth of the first groove 1111 are substantially the same. This facilitates welding the flange portion 22a to the first shell wall 111. The thickness of the flange portion 22a relative to the groove depth of the first groove 1111 is not too large, reducing unnecessary space occupation; nor is the thickness of the flange portion 22a relative to the groove depth of the first groove 1111 too small, thus meeting welding strength requirements.

[0318] Referring to Figures 31-33, in some embodiments of this application, the mounting hole 112 is an elongated hole (e.g., rectangular, elliptical, or racetrack-shaped), and the terminal component 2 is formed as an elongated structure (e.g., rectangular, elliptical, or racetrack-shaped) that matches the shape of the mounting hole 112. When the cell component 3 is first connected to the terminal component 2, and then the terminal component 2 and the cell component 3 are installed together into the housing 11, and then the terminal component 2 extends from the mounting hole 112 to the outside of the first housing wall 111, and then the terminal component 2 is flipped over from the outside of the first housing wall 111 to cover the mounting hole 112, and then the terminal component 2 is connected to the first housing wall 111, if the terminal component 2 is set as an elongated structure that matches the shape of the mounting hole 112, the terminal component 2 can be adjusted so that its thickness direction is parallel to the width direction of the mounting hole 112 (e.g., as shown in Figure 33). The second direction F2) approaches the mounting hole 112 at an angle. After the pole piece 2 passes through the mounting hole 112, the thickness direction of the pole piece 2 is rotated to approach the thickness direction of the first shell wall 111 (for example, the first direction F1 shown in Figure 33). In this way, the space required for the flipping movement of the pole piece 2 is smaller, which can reduce the space required for the flipping of the pole piece 2, thereby helping to shorten the length of the conductive part 4, save materials, reduce costs, and reduce the redundancy of the conductive part 4, reduce the space occupied by the conductive part 4 in the receiving cavity 13, which is beneficial to improving the energy density of the battery cell 102.

[0319] Referring to Figures 33 and 34, in some embodiments, when the cell component 3 and the terminal component 2 are connected first, and then the terminal component 2 is assembled and connected to the first housing wall 111, the cell component 3 and the terminal component 2 can be installed together into the housing 11 after the cell component 3 and the terminal component 2 are connected. This allows the terminal component 2 to be placed over the mounting hole 112 of the first housing wall 111 from the inside (i.e., the side facing the cell body 32). At this time, the edge of the adapter structure 22 overlaps the side of the first housing wall 111 facing the cell component 3. Therefore, since the terminal component 2 is located from the inside of the first housing wall 111 in the mounting hole 112, the cell component 3 and the terminal component 2 can be installed together into the housing 11 without the terminal component 2 needing to pass through the mounting hole 112, thus reducing the number of steps and simplifying the operation.

[0320] Referring to Figures 33 and 34, in some embodiments of this application, when the edge of the adapter structure 22 overlaps with the side of the first shell wall 111 facing the cell component 3, the edge of the adapter structure 22 has a second recess 22b that opens in the direction away from the cell component 3 (i.e., the second recess 22b opens in the direction away from the cell body 32). The first shell wall 111 includes an overlapping portion 1112 protruding from the mounting hole 112, and the overlapping portion 1112 is embedded in the second recess 22b. This facilitates the support and positioning of the connection between the electrode component 2 and the first shell wall 111, and is beneficial for welding the two together from the outside of the first shell wall 111 (i.e., the side away from the cell body 32).

[0321] Referring again to Figures 33 and 34, exemplarily, the thickness of the overlapping portion 1112 matches the groove depth T2 of the second sinker 22b. Here, "matching" means that the thickness of the overlapping portion 1112 is substantially the same as the groove depth of the second sinker 22b. This facilitates welding the overlapping portion 1112 to the first shell wall 111. The thickness of the overlapping portion 1112 relative to the groove depth of the second sinker 22b is not too large, reducing unnecessary space occupation; nor is the thickness of the overlapping portion 1112 relative to the groove depth of the second sinker 22b too small, thus meeting welding strength requirements.

[0322] In some embodiments of this application, referring again to FIG7, the electrode post 2 forms a receiving groove 5 that is recessed relative to the first shell wall 111 in a direction away from the cell component 3 and open in the direction towards the cell component 3. At least a portion of the adapter 35 is received in the electrode post body of the receiving groove 5. That is, the electrode post 2 forms the receiving groove 5, the groove wall of the receiving groove 5 is formed by the electrode post 2, the receiving groove 5 is recessed in a direction away from the cell body 32, and the receiving groove 5 is open in the direction towards the cell body 32, so that the receiving groove 5 communicates with the receiving cavity 13.

[0323] Therefore, by providing a receiving groove 5 to accommodate the adapter 35, the space occupied by the adapter 35 in the receiving cavity 13 can be reduced, allowing the receiving cavity 13 to have more space to accommodate the battery cell body 32. This is beneficial for increasing the volume of the battery cell body 32, thereby increasing the energy density of the battery cell 102. Moreover, since the receiving groove 5 is open towards the battery cell component 3, the adapter 35 can be easily inserted into the receiving groove 5, reducing the difficulty of operation.

[0324] For example, referring again to FIG7, the receiving groove 5 is formed on the side of the electrode body 21 and the adapter structure 22 facing the cell component 3 (i.e. the side facing the cell body 32). The adapter structure 22 protrudes relative to the first shell wall 111 in the direction away from the cell component 3 (i.e. the direction away from the cell body 32), so that the receiving groove 5 is recessed relative to the first shell wall 111 in the direction away from the cell component 3.

[0325] Therefore, by processing the adapter structure 22 into an outwardly protruding shape, a portion of the receiving groove 5 is formed on the side of the pole body 21 facing the cell component 3, and another portion of the receiving groove 5 is formed on the side of the adapter structure 22 facing the cell component 3. The receiving groove 5 has a shape that is recessed relative to the first shell wall 111 in the direction away from the cell component 3. Thus, both the side of the pole body 21 facing the cell component 3 and the side of the adapter structure 22 facing the cell component 3 have a space receiving groove conductive part 4. This not only facilitates the storage of the conductive part 4 to a greater extent, but also facilitates the design of diverse forms of the conductive part 4.

[0326] In other embodiments of this application, referring to FIG27, when the adapter structure 22 does not bulge relative to the first shell wall 111 in the direction away from the cell component 3 (i.e., the direction away from the cell body 32), the receiving groove 5 can be defined by the height difference between the adapter structure 22 and the electrode body 21 in the direction away from the cell component 3 relative to the first shell wall 111.

[0327] In some embodiments of this application, referring again to FIG7, the surface of the end of the electrode body 21 facing the cell component 3 is the inner end face 211 of the electrode body 21. The inner end face 211 of the electrode body 21 participates in forming the receiving groove 5, and the conductive part 4 is connected to the inner end face 211 of the electrode body 21. That is, at least a portion of the inner end face 211 of the electrode body 21 participates in defining the groove wall of the receiving groove 5, and the conductive part 4 is connected to the portion of the inner end face 211 of the electrode body 21 that serves as the groove wall of the receiving groove 5. In the above technical solution, at least a portion of the receiving groove 5 is formed by the side surface of the electrode body 21 facing the cell component 3, and the conductive part 4 housed in the receiving groove 5 can easily contact and connect to the electrode body 21, improving connection convenience and simplifying the structure.

[0328] For example, when at least a portion of the conductive part 4 is accommodated in the receiving groove 5, the pole connection portion of the conductive part 4 (e.g., the closing portion 313 of the pole assembly 33 as described herein, or the second connecting segment 412 or the first conductive segment 415 of the conductive element 41) can be laid on the inner end face 211 of the pole body 21 and connected to the inner end face 211 of the pole body 21. During processing, the pole connection portion of the conductive part 4 can be first inserted into the receiving groove 5, and then the pole connection portion can be laid on the inner end face 211 of the pole body 21 and connected to the inner end face 211 of the pole body 21.

[0329] For example, the conductive part 4 may include a pole connection part, which may be a relatively rigid plate shape, such as one that will not bend or deform downward under the action of gravity, such as the folding part 313 of the tab assembly 33 described herein (e.g., ultrasonic welding), or the second connecting section 412 (e.g., metal sheet) or the first conductive section 415 (e.g., metal sheet) of the conductive member 41.

[0330] For example, referring to FIG7, regardless of whether the adapter structure 22 protrudes relative to the first shell wall 111 in a direction away from the cell component 3, the position of the inner end face 220 of the adapter structure 22 adjacent to the electrode body 21 is a surrounding region 2201 that surrounds the electrode body 21, and the surrounding region 2201 is flush with the inner end face 211 of the electrode body 21. The inner end face 220 of the adapter structure 22 can be a planar structure or a non-planar structure, such as a protruding shape, and the outermost ring of the inner end face 220 of the adapter structure 22 facing the electrode body 21 is the surrounding region 2201.

[0331] For example, when the inner end face 211 of the pole body 21 is set to be large (for example, the transition structure 22 is formed as an elongated strip extending along the length direction of the first shell wall 111, and the outline shape of the pole body 21 matches the outline shape of the transition structure 22), and when the surrounding area 2201 is flush with the inner end face 211 of the pole body 21, the pole connecting portion of the conductive part 4 (for example, the folding portion 313 of the tab assembly 33 described herein, or the second connecting segment 412 of the conductive member 41) can be completely laid flat on the inner end face 211 of the pole body 21.

[0332] For example, referring to FIG25, when the inner end face 211 of the pole body 21 is small (for example, the transition structure 22 is set as an elongated strip extending along the length direction of the first shell wall 111, the pole body 21 is located in the center of the transition structure 22 and has a circular outline), and when the surrounding area 2201 is flush with the inner end face 211 of the pole body 21, a part of the pole connection part of the conductive part 4 (for example, the folding part 313 of the tab assembly 33 described herein, or the second connecting section 412 of the conductive member 41) can be laid flat on the inner end face 211 of the pole body 21, and the rest can be laid flat on the surrounding area 2201, so that the pole connection part of the conductive part 4 (for example, the pole connection part is also elongated) can be supported as a whole, which facilitates the clamping of the welding nozzle, so that the conductive part 4 can be reliably connected to the pole body 21.

[0333] For example, the conductive part 4 may include a pole connection part, which may be a relatively rigid plate shape, such as one that will not bend or deform downward under the action of gravity, such as the folding part 313 of the tab assembly 33 described herein (e.g., ultrasonic welding), or the second connecting section 412 (e.g., metal sheet) or the first conductive section 415 (e.g., metal sheet) of the conductive member 41.

[0334] For example, referring to FIG26, regardless of whether the adapter structure 22 protrudes relative to the first shell wall 111 in a direction away from the cell component 3, the position of the inner end face 220 of the adapter structure 22 adjacent to the electrode body 21 is a surrounding region 2201 surrounding the electrode body 21, and the inner end face 211 of the electrode body 21 protrudes from the surrounding region 2201 in a direction towards the cell component 3. The inner end face 220 of the adapter structure 22 can be a planar structure or a non-planar structure, such as a protruding shape, and the outermost ring of the inner end face 220 of the adapter structure 22 facing the electrode body 21 is the surrounding region 2201.

[0335] Therefore, by setting the inner end face 211 of the electrode body 21 to protrude out of the surrounding area 2201 in the direction of the cell component 3, the electrode body 21 can be retracted inward in the direction of the receiving cavity 13 when the height of the electrode body 21 is constant, so as to reduce the space occupied by the electrode component 2 on the outside of the housing component 1 and reduce the size of the battery cell 102 in the direction of setting the electrode component 2 (for example, the first direction F1 shown in FIG3).

[0336] For example, when the inner end face 211 of the pole body 21 is set to be large (for example, the adapter structure 22 is formed as an elongated strip extending along the length direction of the first shell wall 111, and the outline shape of the pole body 21 matches the outline shape of the adapter structure 22), and when the inner end face 211 of the pole body 21 protrudes from the surrounding area 2201 in the direction of the cell component 3, the pole connection portion of the conductive part 4 (for example, the folding portion 313 of the tab assembly 33 described herein, or the second connection segment 412 of the conductive member 41) can be completely laid flat on the inner end face 211 of the pole body 21.

[0337] For example, referring to FIG26, when the inner end face 211 of the electrode body 21 is small (for example, the transition structure 22 is set as an elongated strip extending along the length direction of the first shell wall 111, the electrode body 21 is located in the center of the transition structure 22 and has a circular outline), and when the inner end face 211 of the electrode body 21 protrudes from the surrounding area 2201 in the direction of the cell component 3, the conductive part 4 can be set to include the tab assembly 33 and the conductive member 41 connected to the tab assembly 33. The conductive member 41 includes a first conductive segment 415 laid on the inner end face 211 of the electrode body 21 and a second conductive segment 416 offset from the inner end face 211 of the electrode body 21. The second conductive segment 416 protrudes relative to the first conductive segment 415 in the direction away from the cell component 3 (i.e., towards the outside, or towards the direction away from the cell body 32). The tab assembly 33 is connected to the second conductive segment 416. Therefore, the height difference between the inner end face 211 of the electrode body 21 and the surrounding area 2201 can be used to accommodate the second conductive segment 416 of the conductive element 41 and the tab assembly 33, thereby making full use of space, reducing the space occupied by the conductive part 4 in the receiving cavity 13, and improving the energy density of the battery cell 102. For example, if the part connecting the tab assembly 33 and the second conductive segment 416 (such as the folding part 313 described herein) is elongated, the second conductive segment 416 can also be set as elongated, while the first conductive segment 415 can be set as a circle that matches the electrode body 21, which can meet the connection requirements. In addition, when the conductive element 41 includes the first conductive segment 415 and the second conductive segment 416, in order to ensure that the second conductive segment 416 protrudes relative to the first conductive segment 415 in a direction away from the cell component 3, the conductive element 41 can be processed from a material with a certain hardness and thickness, for example, the conductive element 41 can be a metal sheet.

[0338] For example, referring to FIG27, regardless of whether the adapter structure 22 protrudes relative to the first shell wall 111 in a direction away from the cell component 3, the position of the inner end face 220 of the adapter structure 22 adjacent to the electrode body 21 is a surrounding region 2201 surrounding the electrode body 21. The surrounding region 2201 protrudes from the inner end face 211 of the electrode body 21 in the direction towards the cell component 3. The inner end face 220 of the adapter structure 22 can be a planar structure or a non-planar structure, such as a protruding shape. The outermost ring of the inner end face 220 of the adapter structure 22 facing the electrode body 21 is the surrounding region 2201.

[0339] For example, referring to FIG29, when the inner end face 211 of the pole body 21 is set to be large (for example, the adapter structure 22 is formed as an elongated strip extending along the length direction of the first shell wall 111, and the outline shape of the pole body 21 matches the outline shape of the adapter structure 22), and when the surrounding area 2201 protrudes from the inner end face 211 of the pole body 21 in the direction of the cell component 3, the pole connection portion of the conductive part 4 (for example, the folding portion 313 of the tab assembly 33 described herein, or the second connecting segment 412 of the conductive member 41) can be completely laid flat on the inner end face 211 of the pole body 21.

[0340] For example, referring to FIG27, when the inner end face 211 of the electrode body 21 is small (for example, the adapter structure 22 is configured as an elongated strip extending along the length direction of the first shell wall 111, and the electrode body 21 is located in the center of the adapter structure 22 with a circular outline), and when the surrounding area 2201 protrudes from the inner end face 211 of the electrode body 21 in the direction toward the cell component 3, the conductive element 41 can be configured to include a first conductive segment 415 laid on the inner end face 211 of the electrode body 21, and a third conductive segment 417 offset from the inner end face 211 of the electrode body 21. The third conductive segment 417 protrudes relative to the first conductive segment 415 in the direction toward the cell component 3, and the tab assembly 33 is connected to the third conductive segment 417. Thus, the adapter 41 can satisfy both the connection requirements with the inner end face 211 of the electrode body 21 and the connection requirements with the tab assembly 33. Furthermore, when the conductive element 41 includes a first conductive segment 415 and a third conductive segment 417, in order to ensure that the third conductive segment 417 protrudes relative to the first conductive segment 415 towards the battery cell component 3, a material with a certain hardness and thickness can be selected to process the conductive element 41. For example, the conductive element 41 can be a metal sheet. For example, if the part of the tab assembly 33 connected to the third conductive segment 417 (such as the retracted part 313 described herein) is elongated, the third conductive segment 417 can also be set to be elongated, while the first conductive segment 415 can be set to a shape that matches the mating area 211a (e.g., circular), which can meet the connection requirements.

[0341] Referring to Figures 4 and 5, in some embodiments, the housing component 1 includes a housing body 11 and a housing cover 12. The housing body 11 is a single piece, with one end open, and the housing cover 12 is disposed at the open end of the housing body 11. Exemplarily, the open end of the housing body 11 has an opening 113, and the housing cover 12 covers the opening 113. The housing body 11 and the housing cover 12 together form a receiving cavity 13. Referring to Figure 4, the first housing wall 111 is located at the end of the housing body 11 away from the housing cover 12; that is, the housing wall at the end of the housing body 11 opposite to the opening 113 is the first housing wall 111. Alternatively, referring to Figure 5, the first housing wall 111 is formed on the housing cover 12, then the housing cover 12 serves as the first housing wall 111.

[0342] Of course, in other examples, the housing component 1 may also include two housing bodies 11, each housing body 11 having one end open to form an opening 113, the openings 113 of the two housing bodies 11 facing each other and overlapping each other, the two housing bodies 11 together forming a receiving cavity 13, and the end of one housing body 11 opposite to the opening 113 being the first housing wall 111.

[0343] In some embodiments, referring to FIG4, the housing component 1 includes a housing body 11 that participates in forming a receiving cavity 13. One end of the housing body 11 is open to form an opening 113, and the end wall of the housing body 11 opposite to the opening 113 is a first housing wall 111. It is understood that the housing body 11 is a one-piece molded part and includes a first housing wall 111 and a second housing wall 114. The second housing wall 114 surrounds the edge of the first housing wall 111 and extends from the edge of the first housing wall 111 toward one side in the thickness direction of the first housing wall 111. The end of the second housing wall 114 away from the first housing wall 111 defines the opening 113, and a cavity is defined between the first housing wall 111 and the second housing wall 114, which constitutes at least a portion of the receiving cavity 13.

[0344] When the housing component 1 includes a shell body 11 with an opening 113 at one end, the housing component 1 also includes a shell body fitting structure. The shell body fitting structure fits with the shell body 11 to cover the opening 113 and together with the shell body 11, forms a receiving cavity 13. For example, the shell body 11 is semi-closed cylindrical, and the shell body fitting structure is flat, that is, the shell body fitting structure can be a shell cover 12. In this case, the housing component 1 can be a combination of the shell body 11 and the shell cover 12. Another example is that the shell body 11 is semi-closed cylindrical, and the shell body fitting structure can be semi-closed cylindrical, that is, the shell body fitting structure can be the other half of the shell body 11. In this case, the housing component 1 can be a combination of two shell bodies 11, etc. Yet another example is that the shell body fitting structure can be a shell assembly, which is assembled from multiple parts. Thus, the housing component has various forms and can adapt to various application scenarios.

[0345] For example, referring to FIG4, the housing component 1 may include a housing body 11 and a housing cover 12. One end of the housing body 11 has an opening 113, and the housing cover 12 covers the opening 113. The housing body 11 and the housing cover 12 together form a receiving cavity 13, and the end of the housing body 11 opposite to the opening 113 serves as a first housing wall 111. Alternatively, for example, the housing component 1 may include two housing bodies 11, each housing body 11 having an opening 113 at one end. The openings 113 of the two housing bodies 11 are opposite to each other and cover each other. The two housing bodies 11 together form a receiving cavity 13, and the end of one housing body 11 opposite to the opening 113 serves as a first housing wall 111.

[0346] In the above technical solution, when the end wall of the shell 11 opposite to the opening is the first shell wall 111, since the cell component 3 housed in the shell component 1 is connected to the terminal component 2 installed on the first shell wall 111, when the battery 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 shell 11 opposite to the opening 113, the force on the terminal component 2 will be preferentially transmitted to the shell 11, and will not directly act on the shell mating structure (e.g., the shell cover 12). This not only extends the distance of force transmission to the connection between the shell 11 and the shell mating structure (e.g., the shell cover 12), but also causes the shell 11 to deform preferentially when subjected to force, thereby reducing the force on the connection between the shell 11 and the shell mating structure (e.g., the shell cover 12). This can effectively reduce the probability of cracking at the connection between the shell 11 and the shell mating structure (e.g., the shell cover 12) during the use of the battery 100, and improve the reliability of the battery cell 102. Furthermore, since the connection between the casing 11 and the casing mating structure (e.g., the cover 12) is less prone to cracking, there is no need to increase the wall thickness of either component to improve the reliability of the connection. This helps reduce weight and material costs, and facilitates the miniaturization of the battery cell 102 or increases its energy density. The connection method between the casing 11 and the casing mating structure is not limited; for example, it can be bonding, welding, etc.

[0347] 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 component 2, if the terminal component 2 is first installed at the mounting hole 112 of the first housing wall 111, and then the cell component 3 is installed into the housing 11, it is difficult to connect the cell component 3 and the terminal component 2. In some embodiments of this application, the cell component 3 and the terminal component 2 can be connected first, and then the terminal component 2 can be assembled and connected to the housing component 1. This satisfies the connection requirements between the cell component 3 and the terminal component 2, as well as the connection requirements between the terminal component 2 and the housing component 1, thereby improving the reliability and manufacturability of the battery cell 102.

[0348] Moreover, this processing sequence allows the length of the conductive part 4 to be effectively shortened. For example, as long as the cell component 3 and the terminal component 2 are connected first, and the terminal component 2 is connected to the housing component 1 later, the material and cost of the conductive part 4 can be saved, the redundancy of the conductive part 4 can be reduced, the risk of short circuit can be reduced, and the space occupied by the conductive part 4 in the housing component 1 can be reduced, which is conducive to improving the energy density of the battery cell 102.

[0349] Referring to Figure 3, in some embodiments of this application, the battery cell 102 further includes a pressure relief component 6, which is disposed on the housing component 1. Exemplarily, the pressure relief component 6 may be an explosion-proof valve installed on the housing component 1, or it may be integrally formed on a thinned area of ​​the housing component 1. Thus, by providing the pressure relief component 6, when the pressure inside the housing component 1 exceeds a preset value, the pressure can be directionally released through the pressure relief component 6, thereby improving the reliability of the battery cell 102. The pressure relief component 6 may be disposed on the first housing wall 111, or on other housing walls besides the first housing wall 111, where the first housing wall 111 may be one or more.

[0350] For example, referring to Figure 3, the pressure relief component 6 and the terminal post component 2 are located on the same side. Since the terminal post component 2 is located on the first housing wall 111, when the pressure relief component 6 is also located on the first housing wall 111, the pressure relief component 6 and the terminal post component 2 are located on the same side. As a result, the design of the other housing walls besides the first housing wall 111 can be simplified, and the structure and processing of the battery cell 102 can be simplified.

[0351] For example, the pressure relief component 6 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 component 6 is located on another wall of the housing component 1 other than the first shell wall 111, for example, the pressure relief device 6 is located on the second shell wall 114, or the pressure relief device 6 is located on the shell cover 12, the pressure relief device 6 and the pole member 2 are located on opposite sides. Therefore, there is no need to consider reducing the volume of the pole member 2 by occupying the space of the first shell wall 111, so that the shape and volume of the pole member 2 can be flexibly designed as needed.

[0352] For example, the shell component 1 can be surrounded by multiple non-coplanar shell walls. For example, the cuboid shell wall component is surrounded by six shell walls, one of which is the first shell wall 111. The pressure relief component 6 is placed on any other shell wall other than the first shell wall 111, and the pole component 2 is placed on the first shell wall 111, so that the two are located on opposite sides.

[0353] Secondly, embodiments of this application provide a processing method for processing the aforementioned battery cell 102. Referring to Figure 35, the processing method includes:

[0354] Step S20: Install the battery cell component 3 into the receiving cavity 13, and set one end of the battery cell component 3 with the tab group 33 on the inner side of the first shell wall 111 opposite to the first shell wall 111.

[0355] Step S30: Install the pole piece 2 on the first housing wall 111, and connect the tab assembly 33 to the pole body 21 through the adapter 35, and make the adapter 35 support the free end 331 of the tab assembly 33 so that the adapter 35 can prevent the free end 331 from moving toward the cell body 32.

[0356] "Inner side of the first shell wall 111" refers to the side of the first shell wall 111 facing the cell body 32 in the thickness direction; similarly, "outer side of the first shell wall 111" refers to the side of the first shell wall 111 away from the cell body 32 in the thickness direction.

[0357] The order of "installing the pole piece 2 on the first housing wall 111" and "connecting the tab assembly 33 to the pole piece body 21 via the adapter 35" is not limited in this application. The pole piece 2 can be installed on the first housing wall 111 first, and then the tab assembly 33 can be connected to the pole piece body 21 via the adapter 35. Alternatively, the tab assembly 33 can be connected to the pole piece body 21 via the adapter 35 first, and then the pole piece 2 can be installed on the first housing wall 111. Regardless of the order, the adapter 35 can support the free end 331 of the tab assembly 33.

[0358] Therefore, by indirectly connecting the tab group 33 and the terminal body 21 through the adapter 35 to form electrical conduction, the length of the tab group 33 can be shortened and the redundancy of the tab group 33 can be improved. This is beneficial to improving the problems of wrinkling, bending and breakage of the tab pieces 311 of the tab group 33. At the same time, since the length of the tab group 33 is relatively short, and the adapter 35 has certain restrictions on the tab group 33 due to its connection with the tab group 33, it is beneficial to reduce the risk of short circuit caused by the tab group 33 being inserted backward into the cell body 32. Moreover, by flexibly designing the shape and material of the adapter 35, it is easy to reduce the connection difficulty between the adapter 35 and the terminal body 21 and the tab group 33, which is beneficial to improving the assembly convenience of the battery cell 102.

[0359] Furthermore, the adapter 35 supports the free end 331 of the tab assembly 33. For example, a portion of the adapter 35 can support the side of the free end 331 of the tab assembly 33 facing the cell body 32, or a portion of the adapter 35 can support the side of the free end 331 of the tab assembly 33 away from the terminal body 21, such that the free end 331 of the tab assembly 33 is located between the portion of the adapter 35 supporting the free end 331 of the tab assembly 33 and the inner end face 211 of the terminal body 21. Therefore, the aforementioned... The support structure can prevent the free end 331 of the tab assembly 33 from moving toward the cell body 32. For example, when the tab assembly 33 is subjected to an external force that causes the tab assembly 33 to tend to move toward the cell body 32, the adapter 35 can apply a reaction force to the free end 331 of the tab assembly 33 to hinder the tendency of the tab assembly 33 to move toward the cell body 32, thereby reducing the risk of the tab assembly 33 moving toward the cell body 32 and causing a short circuit due to inverted insertion into the cell body 32, which is beneficial to improving the reliability of the battery cell 102.

[0360] It is understandable that in the step of "installing the electrode post 2 on the first housing wall 111, and connecting the electrode tab assembly 33 to the electrode post body 21 through the adapter 35, and making the adapter 35 support the free end 331 of the electrode tab assembly 33", the electrode tab assembly 33 is first connected to the electrode post body 21 through the adapter 35, and then the electrode post 2 is installed on the first housing wall 111. Therefore, the battery cell 3 is first connected to the electrode post 2, and then the electrode post 3 connected to the battery cell 3 is installed on the first housing wall 111. Since the electrode post 2 has various forms, it can be a whole that cannot be separated from the incoming material, or it can be a multi-part material that is assembled later. In this case, "installing the electrode post 2 connected to the battery cell 3 on the first housing wall 111" can be interpreted in a broad sense, that is, assembling the part of the electrode post 2 that is connected to the battery cell 3 onto the first housing wall 111.

[0361] For example, when the terminal component 2 does not need to be assembled, "connecting the cell component 3 to the terminal component 2; installing the terminal component 2 connected to the cell component 3 to the first housing wall 111" can specifically be: "first connecting the terminal component 2 to the cell component 3, and then installing the terminal component 2 to the first housing wall 111 (for example, covering the mounting hole 112 on the first housing wall 111 with the terminal component 2, and then connecting the terminal component 2 to the first housing wall 111 by welding, riveting, or bonding, etc.)".

[0362] For example, when the terminal component 2 needs to be assembled, "connecting the cell component 3 to the terminal component 2; installing the terminal component 2 connected to the cell component 3 to the first housing wall 111" can also be: "first completing the connection of a part of the terminal component 2 (e.g., the first terminal component) to the cell component 3, and the connection of the remaining part of the terminal component 2 (e.g., the second terminal component) to the first housing wall 111, and then combining and connecting the above two parts of the terminal component 2."

[0363] Because the connection between the cell component 3 and the terminal component 2 is completed first, followed by the assembly connection between the terminal component 2 and the housing component 1, rather than pre-assembling the terminal component and the housing component first and then connecting the cell component and the terminal component, this method helps to shorten the length of the conductive part 4 connecting the terminal component 2 and the cell component 3, reduces the redundancy of the conductive part 4 within the housing component 1, reduces the space occupied by the conductive part 4 within the housing component 1, improves the energy density of the battery cell 102, and reduces the risk of short circuits caused by the conductive part 4 being inserted backwards into the cell body 32 of the cell component 3, thus improving the reliability of the battery cell 102. Furthermore, this assembly method allows for the assembly of the battery cell 102 regardless of whether the terminal component 2 is placed on the housing body 11 or the housing cover 12, allowing for flexible selection of the installation position of the terminal component 2 on the housing component 1. When the terminal component 2 is placed on the housing body 11, it helps to reduce cracking at the connection between the housing body 11 and the housing cover 12, improving the reliability of the battery cell 102.

[0364] In the embodiments of this application, the order in which the various steps of the processing method are executed is not based on the step number, unless there is a conflict. That is, the step number does not constitute a restriction on the order in which the steps are executed.

[0365] Please refer to Figures 36-37E. In some embodiments, the first shell wall 111 has a mounting hole 112. Step S20, "installing the pole member 2 on the first shell wall 111, and connecting the tab assembly 33 to the pole body 21 through the adapter 35, and making the adapter 35 support the free end 331 of the tab assembly 33", includes: Step S31, connecting one end of the adapter 35 to the tab assembly 33, and the other end passing through the mounting hole 112 to the outside of the first shell wall 111 and connecting to the pole body 21; Step S32, covering the mounting hole 112 from the inside or outside of the first shell wall 111 with the pole member 2 connected to the adapter 35.

[0366] As can be seen, the above scheme can be understood as follows: the adapter 35 first passes through the mounting hole 112, the adapter 35 is welded to the pole member 2 outside the mounting hole 112, and the pole member 2 then covers the mounting hole 112 from the outside or inside of the first shell wall 111. It can be understood that in the above scheme, when the pole member 2 covers the mounting hole 11 from the inside of the first shell wall 111, the pole member 2 can pass through the mounting hole 112 again so that the pole member 2 is located on the inside of the first shell wall 111, so as to connect the pole member 2 to the first shell wall 111.

[0367] For example, in step S31, "connecting one end of the adapter 35 to the tab assembly 33, and the other end through the mounting hole 112 to the outside of the first housing wall 111 and connecting it to the electrode body 21," one end of the adapter 35 is first connected to the tab assembly 33, and then the other end of the adapter 35 is passed through the mounting hole 112 to the outside of the first housing wall 111. Then, the adapter 35, now outside the first housing wall 111, is connected to the electrode body 21 of the electrode component 2 located on the outside of the first housing wall 111. Thus, since the adapter 35 is not yet connected to the electrode component 2 when it passes through the mounting hole 112, it is convenient for the adapter 35 to pass through the mounting hole 112, improving operational convenience. Furthermore, since the welding position between the electrode component 2 and the adapter 35 is located on the outside of the first housing wall 111, the problem of conductive debris formed during welding entering the interior of the housing 11 and damaging the battery cell component 3 can be mitigated.

[0368] For example, the mounting hole 112 is an elongated hole (e.g., rectangular, elliptical, racetrack-shaped, etc.), and the portion of the adapter 35 that needs to pass through the mounting hole 112 is an elongated shape matching the shape of the mounting hole 112. In this case, the thickness direction of this portion of the adapter 35 can be adjusted to match the width direction of the mounting hole 112, and the length direction of this portion of the conductive part 4 forms an angle with the length direction of the mounting hole 112. This allows this portion of the adapter 35 to pass smoothly through the mounting hole 112, improving assembly efficiency and reducing the risk of collision and scratches between the adapter 35 and the housing component 1. However, this application is not limited to this; the mounting hole 112 and the portion of the adapter 35 that needs to pass through the mounting hole 112 can also be processed into other shapes, such as circles, polygons, etc.

[0369] In the above scheme, the adapter 35 first passes through the mounting hole 112 and connects the adapter 35 to the pole member 2 outside the mounting hole 112. Then, the pole member 2 connected with the adapter 35 covers the mounting hole 112. This scheme is applicable to scenarios where the shell cover 12 serves as the first shell wall 111, scenarios where the shell body 11 includes the first shell wall 111, and scenarios where the free end 331 is connected to the adapter 35 in the form of a stacked portion 312 or a first gathered portion 332, as described below.

[0370] Please refer to Figures 38-39D. In some embodiments, the first housing wall 111 has a mounting hole 112. Step S30, "installing the electrode component 2 on the first housing wall 111, and connecting the electrode tab assembly 33 to the electrode body 21 through the adapter 35, and making the adapter 35 support the free end 331 of the electrode tab assembly 33", includes: Step S33, placing the battery cell component 3 on the inner side of the first housing wall 111, connecting one end of the adapter 35 to the electrode tab assembly 33, and connecting the other end to the electrode body 21; Step S34, passing the electrode component 2 connected with the adapter 35 through the mounting hole 112 and covering the mounting hole 112 from the inner or outer side of the first housing wall 111.

[0371] As can be seen, the above scheme can be understood as follows: the adapter 35 is first connected to the terminal component 2, that is, the cell component 3 is first connected to the terminal component 2. Then, the terminal component 2 is passed through the mounting hole 112 and the mounting hole 11 is covered from the outside or inside of the first shell wall 111. This also achieves the assembly of the cell component 3 and the terminal component 2, and the terminal component 2 and the first shell wall 111. It can be understood that in the above scheme, when the terminal component 2 connected to the adapter 35 covers the mounting hole 11 from the inside of the first shell wall 111, the terminal component 2 connected to the adapter 35 does not need to pass through the mounting hole 112 and can cover the mounting hole 112 from the inside of the first shell wall 111; or, the terminal component 2 connected to the adapter 35 passes through the mounting hole 112 again so that the terminal component 2 is located on the inside of the first shell wall 111, so as to connect the terminal component 2 connected to the adapter 35 to the first shell wall 111.

[0372] In the above scheme, the adapter 35 is first connected to the pole component 2, and then the pole component 2 is installed on the first shell wall 111. This scheme is applicable to scenarios where the shell cover 12 serves as the first shell wall 111, scenarios where the shell body 11 includes the first shell wall 111, and scenarios where the free end 331 is connected to the adapter 35 in the form of a stacked portion 312 or a first gathering portion 332, as described below.

[0373] For example, the electrode component 2 includes an electrode body 21 and a transition structure 22. "Installing the electrode component 2 on the first shell wall 111" can be understood as installing the electrode component 2 connected to the cell component 3 onto the first shell wall 111. Specifically, it may include: setting the electrode component 2 connected to the cell component 3 at the mounting hole 112 and connecting the transition structure 22 to the first shell wall 111.

[0374] Specifically, "the electrode post 2 connected to the battery cell component 3 is disposed at the mounting hole 112, and the adapter structure 22 is connected to the first housing wall 111" can include: the electrode post 2 connected to the battery cell component 3 extends from the inside of the first housing wall 111 through the mounting hole 112 to the outside of the first housing wall 111; the electrode post 2 extending to the outside of the first housing wall 111 covers the mounting hole 112 from the outside of the first housing wall 111, so that the adapter structure 22 abuts against the outside of the first housing wall 111; and the adapter structure 22 is connected to the first housing wall 111 from the outside of the first housing wall 111. The adapter structure 22 abutting against the outside of the first housing wall 111 means that the adapter structure 22 is partially supported on a side of the first housing wall 111 away from the battery cell body 32.

[0375] Therefore, since the cell component 3 is connected to the terminal component 2 first, and then the terminal component 2 is passed through the mounting hole 112, there is no need to consider avoiding the first shell wall 111 when connecting the cell component 3 and the terminal component 2. In other words, when connecting the cell component 3 and the terminal component 2, the terminal component 2 and the cell component 3 are not located on opposite sides of the first shell wall 111. This helps to further shorten the length of the conductive part 4, reduce the redundancy of the conductive part 4 after assembly, reduce the risk of reverse insertion, and improve the reliability of the battery cell 102. Moreover, since the welding position of the terminal component 2 and the cell component 3 is located on the outside of the shell 11, the problem of conductive debris formed during the welding process entering the interior of the shell 11 and damaging the cell component 3 can be improved. Furthermore, since the pole piece 2 is installed on the mounting hole 112 from the outside of the first housing wall 111, the adapter structure 22 abuts against the outside of the first housing wall 111, and the adapter structure 22 is connected to the first housing wall 111 from the outside of the first housing wall 111, so as to facilitate the assembly and connection of the pole piece 2 and the first housing wall 111, which helps to improve the connection reliability of the pole piece 2 and the first housing wall 111.

[0376] Please refer to Figures 40 and 41. In some embodiments, the tab assembly 33 includes a plurality of tab pieces 311. Before connecting the tab assembly 33 to the adapter 35 in step S31, step S10a is also included, which involves bringing together the plurality of tab pieces 311 to form a stacked portion 312 at the free end 331. The stacked portion 312 means that the plurality of tab pieces 311 are only gathered together at the free end 331 without being connected, so as to achieve the shaping of the tab assembly 33 and facilitate subsequent connection with the adapter 35.

[0377] For example, the step of connecting one end of the adapter 35 to the tab assembly 33 in step S31 includes: step S311, connecting multiple tabs 311 of the tab assembly 33 at the stacked portion 312 to form a first gathering portion 332; step S312, connecting at least a portion of the first gathering portion 332 to the adapter 35. It can be seen that the stacked portion 312 is pre-connected to form a first gathering portion 332 with a certain rigidity, rather than a loose, multi-layered foil shape. This facilitates the connection between the first gathering portion 332 and the adapter 35, and makes the welding between the tab 33 and the adapter 35 more reliable. It also prevents the formation of pores in the weld, improving the connection reliability and conductivity at the weld, and making the conductivity between the cell component 3 and the terminal component 2 more stable and reliable. Among them, the multi-layered tabs 311 in the first gathering part 332 are electrically conductive, that is, the multi-layered tabs 311 in the first gathering part 332 not only have a stacked arrangement, but also have a connected and conductive relationship.

[0378] For example, the step of connecting one end of the adapter 35 to the tab assembly 33 in step S31 includes: step S313, connecting at least a portion of the stacked portion 312 to the adapter 35. It can be seen that the stacked portion 312 can also be directly connected to the adapter 35 without pre-connection, which simplifies the processing steps and improves processing efficiency. While connecting the stacked portion 312 to the adapter 35, the stacked portion 312 forms a first gathering portion 332, thus achieving a reliable connection between the stacked portion 312 and the adapter 35.

[0379] It is understandable that in the above scheme, whether the first gathering part 332 is connected to the adapter 35 or the stacked part 312 is connected to the adapter 35, the connection position is such that after the pole member 2 is installed on the first shell wall 111, at least a part of the first gathering part 332 is connected to a part of the adapter 35 on the side away from the cell body 32, so that the adapter 35 can prevent the free end 331 from moving toward the cell body 32.

[0380] Furthermore, in the above scheme, when there is only one battery cell body 32, all the tabs 311 of the battery cell body 32 are brought together to form a stacked portion 312 at the free end 331; when multiple battery cell bodies 32 constitute a battery cell group 32A, and the battery cell group 32A is a group, the tabs 311 of the battery cell group 32A are brought together to form a stacked portion 312 at the free end 331; and when there are multiple battery cell groups 32A, the tabs 311 of each battery cell group 32A are brought together to form a stacked portion 312 at the free end 331. At this time, there can be multiple stacked portions 312, and each stacked portion 312 is connected to the adapter 35, or each stacked portion 312 forms a first gathering portion 332 and then is connected to the adapter 35.

[0381] In the above scheme, if there are multiple battery cell bodies 32, before connecting the tabs 3 and the adapter 35, multiple battery cell bodies 32 are stacked first. Several tabs 311 of the same polarity of multiple battery cell bodies 32 in the same battery cell group 32A are gathered together to form a stacked portion 312. Compared with the technical solution of gathering the tabs 311 of each battery cell body 32 separately to form a stacked portion 312, connecting the stacked portion 312 of each battery cell assembly 31 separately to the conductive member 41, and then stacking multiple battery cell bodies 32, on the one hand, it can reduce the total number of stacked portions 312 and adapters 35, reduce the connection steps between stacked portions 312 and adapters 35, and improve processing efficiency. On the other hand, it can avoid the problem of cracking at the connection position between the tab group 33 and the battery cell body 32 due to the asynchronous movement of the tabs 311 of different battery cell bodies 32 when the stacked portion 312 is connected to the conductive member 41 first and then the battery cell bodies 32 are stacked.

[0382] It is understandable that, whether the free end 331 is connected to the adapter 35 in the form of a stacked portion 312 or in the form of a first gathering portion 332, the free end 331 and the adapter 35 can be stacked along the thickness direction of the free end 331, which facilitates the cooperation and connection between the free end 331 and the adapter 35.

[0383] In the above scheme, regardless of whether the main body 32 of the battery cell is one or more, or the form in which the free end 331 is connected to the adapter 35, it is applicable to both the scenario where the cover 12 serves as the first shell wall 111 and the scenario where the shell body 11 includes the first shell wall 111.

[0384] Please refer to Figures 37A, 37B, and 42. In some embodiments, the end of the adapter 35 away from the pole body 21 has a clamping structure 356, and the clamping structure 356 includes two opposing clamping portions 3561. In this case, the step of connecting one end of the adapter 35 to the pole assembly 33 in step S31 includes: step S314, clamping the free end 331 from both sides of the free end 331 with the two clamping portions 3561; step S315, connecting both clamping portions 3561 to the free end 331.

[0385] It is understandable that the free end 331 can cooperate with the clamping structure 356 in the form of a stacked portion 312, or it can cooperate with the clamping structure 356 in the form of the first gathering portion 332. Thus, the two clamping portions 3561 can protect the free end 331, thereby improving the problem of the free end 331 being prone to cracking during the connection with the clamping structure 356, and improving the connection reliability between the adapter 35 and the tab assembly 33.

[0386] For example, before the clamping structure 356 engages with the free end 331, the two clamping portions 3561 are first opened, for example, one of the clamping portions 3561 is flipped away from the other clamping portion 3561 to increase the included angle between the two clamping portions 3561, so that the free end 331 can be quickly engaged between the two clamping portions 3561; then the free end 331 is engaged between the two clamping portions 3561 to reduce the included angle between the two clamping portions 3561, so that the two clamping portions 3561 are clamped on both sides of the thickness of the free end 331, and then the clamping structure 356 is connected to the free end 331.

[0387] Referring to Figure 43, in some embodiments, the adapter 35 includes multiple adapter foils 350. In this case, before connecting one end of the adapter 35 to the tab assembly 33 in step S31, the method further includes: step S10b, stacking the multiple adapter foils 350; step S10c, connecting the stacked portions to form a first connecting portion 351, thereby achieving the connection of the multiple adapter foils 350, improving the compactness of the adapter foils 350 in the first connecting portion 351, and facilitating the connection between the adapter 35 and the pole post component 2. Step S31, connecting one end of the adapter 35 to the tab assembly 33 and the other end to the pole post body 21, includes: step S316, connecting a portion of the stacked multiple adapter foils 350 to the free end 331, so that the stacked portion forms a second connecting portion 352 spaced apart from the first connecting portion 351; step S317, connecting the first connecting portion 351 to the pole post body 21.

[0388] As can be seen, in the above scheme, "connecting multiple transition foils 350 to the free end 331" and "connecting the stacked portion of multiple transition foils 350 to form a second connecting part 351" can be performed simultaneously, which helps to simplify the processing steps. The order of "forming the second connecting part 352" (connecting the stacked portion of multiple transition foils 350 to the free end 331 so that the stacked portion forms a second connecting part 352 that is spaced apart from the first connecting part 351) and "connecting the first connecting part 351 to the pole body 21" is not specifically limited.

[0389] Of course, in other embodiments of this application, when the adapter 35 includes multiple adapter foils 350, the step of connecting one end of the adapter 35 to the tab assembly 33 and the other end to the pole body 21 can also be configured to include: connecting the stacked portions of the multiple adapter foils 350 to form a second connecting portion 352, and then connecting the second connecting portion 352 to the free end 331; that is, "connecting the multiple adapter foils 350 to the free end 331" and "connecting the stacked portions of the multiple adapter foils 350 to form the second connecting portion 351" are performed separately and sequentially.

[0390] It is understandable that in the above solution, whether the stacked portion of multiple adapter foils 350 is connected to the free end 331 to form a second connection portion 352 spaced apart from the first connection portion 351, or the second connection portion 352 is formed first and then connected to the free end 331, the free end 331 can be connected in the form of a stacked portion 312, or the free end 331 can also be connected in the form of a first gathering portion 332.

[0391] Please refer to Figures 37E, 39D, and 44. In some embodiments, step S32, which involves covering the mounting hole 112 with the electrode post 2 connected to the adapter 35 from the inside or outside of the first housing wall 111, includes step S30a, where, when the electrode post 2 is installed on the first housing wall 111, the portion between the first housing wall 111 and the cell body 32 after the tab assembly 33 and the adapter 35 are connected is bent. In other embodiments, step S34, which involves covering the mounting hole 112 with the electrode post 2 connected to the adapter 35 from the inside or outside of the first housing wall 111 after passing through the mounting hole 112, includes step S30a, where, when the electrode post 2 is installed on the first housing wall 111, the portion between the first housing wall 111 and the cell body 32 after the tab assembly 33 and the adapter 35 are connected is bent.

[0392] Therefore, in either case, the conductive part 4 formed by the tab assembly 33 and the adapter 35 can act as a buffer. When the battery cell 102 is used in a vibration environment, it can reduce the impact of the cell body 32 toward the first shell wall 111, thus protecting the cell component 3 and improving the reliability of the battery cell 102. In addition, the pole component 2 is installed before the first shell wall 111. After the tab assembly 33 and the adapter 35 are connected, the part located between the first shell wall 111 and the cell body 32 can be basically in an unfolded state. This facilitates the connection between the tab assembly 33 and the adapter 35, and / or the connection between the adapter 35 and the pole body 21, and provides sufficient operating space. For example, it is convenient to lay the part of the adapter 35 that is connected to the pole body 21 on the pole body 21 for connection.

[0393] In the above scheme, when the pole piece 2 is installed on the first housing wall 111, the portion of the pole piece 33 and the adapter 35 located between the first housing wall 111 and the cell body 32 after connection is bent. This can include, but is not limited to, shaping the portion of the pole piece 33 and the adapter 35 located between the first housing wall 111 and the cell body 32 to make the portion bent. The shaping method and time are not limited. For example, it can be performed in conjunction with the pole piece 2 covering the first housing wall 111, or in conjunction with the first pole piece 21a covering the second pole piece 21b, thereby improving processing efficiency. Of course, when the pole piece 2 is installed on the first housing wall 111, it is not necessary to shape the portion of the pole piece 33 and the adapter 35 located between the first housing wall 111 and the cell body 32. Since the installation of the pole piece 2 reduces the space, the pole piece 33 and the adapter 35 are bent at relatively weak positions due to external force.

[0394] It is understandable that after the tab assembly 33 and the adapter 35 are connected, the portion located between the first shell wall 111 and the cell body 32 is bent. After this process is completed, the current state of the battery cell 102 can be: the tab assembly 33 is bent to form at least one opening groove (including the first opening groove 334), and / or the adapter 35 is bent to form the second opening groove 355. For example, after the above process is completed, the tab assembly 33 is bent to form the first opening groove 334, and the adapter 35 is bent to form the second opening groove 355. The conductive part 4 is roughly in a serpentine shape with reciprocating bends. This can simplify the above steps, shorten the length of the conductive part 4, simplify the structure of the conductive part 4, and facilitate the processing of the conductive part 4.

[0395] Referring to Figures 37A-37E and Figure 45, in some embodiments, the battery cell 102 includes an insulating support 42 located inside the first housing wall 111. The insulating support 42 can be disposed on the side of the cell component 3 near the terminal component 2. The insulating support 42 has a through hole 40, and the tab assembly 33 passes through the through hole 91. At this time, in step S30a, when the terminal component 2 is installed on the first housing wall 111, the portion of the tab assembly 33 located between the first housing wall 111 and the cell body 32 after the connection of the adapter 35 is bent. The steps include: step S301, when the pole member 2 is installed on the first housing wall 111, the portion of the pole tab assembly 33 and the adapter 35 located between the first housing wall 111 and the cell body 32 is bent to form a first opening groove 334, and the free end 331 defines at least a portion of the groove wall of the first opening groove 334 near the pole member 21; step S302, a portion of the insulating support 42 is inserted into the first opening groove 334 so that the insulating support 42 can prevent the free end 331 from moving toward the cell body 32.

[0396] For example, "bending the portion of the electrode assembly 33 and the adapter 35 located between the first housing wall 111 and the cell body 32 to form the first opening groove 334" and "inserting a portion of the insulating bracket 42 into the first opening groove 334" can be performed simultaneously.

[0397] Please refer to Figures 37D, 37E, and 46. In some embodiments, the battery cell 102 includes an insulating support 42 located inside the first housing wall 111. Step S30a, when the terminal component 2 is installed on the first housing wall 111, the part of the electrode assembly 33 and the adapter 35 connected after connection is bent, includes: Step S303, when the terminal component 2 is installed on the first housing wall 111, the part of the electrode assembly 33 and the adapter 35 connected, located between the first housing wall 111 and the cell body 32, is bent. The portion of the bend forms a first opening groove 334, and a second opening groove 355 adjacent to the first opening groove 334 and located on the side of the first opening groove 334 facing the electrode body 21. The opening orientations of the second opening groove 355 and the first opening groove 334 are arranged at an angle. In step S304, a portion of the insulating bracket 42 is inserted into the first opening groove 334 and the second opening groove 355 so that the insulating bracket 42 can prevent the free end 331 from moving toward the cell body 32, and at the same time, the insulating bracket 42 can also prevent the adapter 35 from moving toward the cell body 32.

[0398] For example, with the conductive part 4 connected to the battery cell body 32 located inside the insulating support 42 and the electrode post 2 connected to the conductive part 4 located outside the first shell wall 111, "bending the portion of the conductive part 4 located between the electrode post 2 and the battery cell body 32 to form a first opening groove 334 and a second opening groove 355 with opposite opening directions" specifically may include: along with the action of covering the electrode post 2 towards the first shell wall 111, the conductive part 4 forms two opening grooves 42 with opposite opening directions on the inner and outer sides of the insulating support 42, that is, the conductive part 4 forms one opening groove (i.e., the first opening groove 421) on the inner side of the insulating support 42, and the conductive part 4 forms another opening groove (i.e., the second opening groove 422) on the outer side of the insulating support 42. Thus, by setting the insulating support 42, it is convenient for the conductive part 4 to bend into the first opening groove 334 and the second opening groove 355 with opposite opening directions, reducing the processing difficulty.

[0399] Referring to Figure 47, in some embodiments, in steps S31 and / or S33, the step of connecting the other end of the adapter 35 to the electrode body 21 includes: step S30b, adjusting the angle of the electrode component 2 so that the normal of the inner end face 211 of the electrode body 21 is close to the stacking direction of the multiple cell bodies 32. In steps S32 and / or S34, the step of covering the electrode component 2 with the adapter 35 onto the mounting hole 112 includes: step S30c, adjusting the angle of the electrode component 2 on the outside of the first shell wall 111 so that the normal of the inner end face 211 of the electrode body 21 is close to the stacking direction perpendicular to the multiple cell bodies 32 (e.g., the fourth direction F4), and the tab assembly 33 is bent and deformed to form a first opening groove 334, and the adapter 35 is bent and deformed to form a second opening groove 355. The openings of the first opening groove 334 and the second opening groove 355 are arranged at an angle so that the conductive part 4 is approximately serpentine in shape.

[0400] In this embodiment, the stacking step of multiple battery cell bodies 32 can be performed before connecting the adapter 35 to the terminal component 2, or after connecting the adapter 35 to the terminal component 2.

[0401] The phrase "the normal of the inner end face 211 of the electrode body 21 is close to the stacking direction of the multiple cell bodies 32" means that the normal of the inner end face 211 of the electrode body 21 is consistent with or substantially consistent with the stacking direction of the multiple cell bodies 32. "Substantially consistent" can be understood as a small angle between them, for example, less than 10°. The phrase "setting the electrode component 2 on one side of the protruding tab group 33 of the cell component 3" can be understood as: the tab group 33 is located on one side of the cell body 32. Setting the electrode component 2 and the tab group 33 on the same side of the cell body 32 helps to shorten the length of the tab portion 33. In the above technical solution, the "length of the tab portion 33" ensures that when the normal of the inner end face 211 of the electrode body 21 is close to the stacking direction of the multiple cell assemblies 31, the electrode component 2 can be located on one side of the protruding tab portion 33 of the cell component 3, and the adapter 35 can be laid on the inner end face 211 of the electrode body 21.

[0402] In the above technical solution, by first adjusting the position and angle of the pole piece 2 so that the normal of the inner end face 211 of the pole piece body 21 is close to the stacking direction of the multiple battery cell assemblies 31, and then laying the part of the adapter 35 connected to the pole piece body 21 on the inner end face 211 of the pole piece body 21, there is no need to adjust the angle of the pole piece body 21. This allows sufficient space near the mating position of the part of the adapter 35 connected to the pole piece body 21 and the inner end face 211 of the pole piece body 21 for welding operations, thereby simplifying the operation. Moreover, this allows the length of the tab 33 to be shorter. Then, when adjusting the angle of the pole piece 2 to connect with the first shell wall 111, the conductive part 4 can be bent to form the first opening groove 334 and the second opening groove 355.

[0403] Please refer again to Figure 48. In some embodiments, the housing component 1 includes a housing body 11 and a housing cover 12. The housing body 11 has an opening 113. When the end wall of the housing body 11 opposite to the opening 113 is the first housing wall 111, step S20, inserting the battery cell component 3 into the receiving cavity 13 and setting the battery cell component 3 inside the first housing wall 111 and opposite to the first housing wall 111, includes: step S21, inserting the battery cell component 3 into the receiving cavity 13 through the opening 113; step S22, extending the electrode assembly 33 from the mounting hole 113 so that one end of the battery cell component 3 with the electrode assembly 33 is set inside the first housing wall 111 and opposite to the first housing wall 111; step S23, closing the housing cover 12 onto the opening 113.

[0404] In the above scheme, "inserting the battery cell component 3 into the receiving cavity 13 and setting the battery cell component 3 inside the first housing wall 111 and opposite to the first housing wall 111" may include: adjusting the relative positions of the housing body 11, the battery cell component 3, and the conductive part 4 so that the battery cell component 3 is located on the side of the adapter 35 connected to it away from the housing body 11, and the opening 113 of the housing body 11 faces the adapter 35, and then inserting the battery cell component 3 and the adapter 35 into the housing body 11 through the opening 113. The order of "inserting the battery cell component 3 into the receiving cavity 13 through the opening 113" and "extending the tab assembly 33 from the mounting hole 113 so that one end of the battery cell component 3 with the tab assembly 33 is set inside the first housing wall 111 and opposite to the first housing wall 111" is not specifically limited, for example, the two can be performed simultaneously.

[0405] Therefore, by placing the terminal component 2 at the end opposite to the opening 113 of the housing 11, it is beneficial to improve the cracking problem at the connection between the housing 11 and the cover 12, and improve the reliability of the battery cell 102. The "adjustment of the relative positions of the housing 11, the cell component 3, and the conductive part 4" can be achieved by adjusting the position of the housing 11, or by adjusting the positions of the cell component and the conductive part; the "insertion of the cell component 3 and the adapter 35 into the housing 11 through the opening 113" can be achieved by pushing the cell component, or by fitting the housing into place.

[0406] For example, the action of the adapter 35 passing through the mounting hole 112 to the outside of the first housing wall 111 can be achieved smoothly as the battery cell component 3 is inserted into the housing 11. That is, the action of the adapter 35 passing through the mounting hole 112 is completed smoothly as the battery cell component 3 is inserted into the housing, making the operation convenient and improving the processing efficiency.

[0407] For example, when assembling the battery cell 102, the tab assembly 33 can be connected to the adapter 35 to form the conductive part 4. Then, the cell component 3 is installed into the housing 11 with the conductive part 4 facing the mounting hole 112 relative to the cell body 32. As the cell component 3 is installed into the housing 11, the conductive part 4 passes through to the outside of the mounting hole 112. The conductive part 4 is connected to the pole component 2 located on the outside of the first housing wall 111. Then, the pole component 2 with the conductive part 4 is covered by the mounting hole 112 from the outside of the first housing wall 111. After that, the pole component 2 covered by the mounting hole 112 is connected to the first housing wall 111.

[0408] Please refer to Figures 49, 50A-50F. In some embodiments, the housing component 1 includes a housing body 11 and a housing cover 12. The housing body 11 has an opening 113. When the housing cover 12 is the first housing wall 111, step S20, inserting the battery cell component 3 into the receiving cavity 13 and setting the battery cell component 3 on the inner side of the first housing wall 111 and opposite to the first housing wall 111, includes: step S24, supporting the battery cell component 3 on the inner side of the housing cover 12; step S25, extending the electrode assembly 33 from the mounting hole 112 so that one end of the battery cell component 3 with the electrode assembly 33 is set on the inner side of the first housing wall 111 and opposite to the first housing wall 111; step S26, fitting the housing body 11 onto the outer side of the battery cell component 3, and connecting the housing body 11 with the housing cover 12.

[0409] For example, "connecting the adapter 35 extending to the outside of the first housing wall 111 to the pole body 21 of the pole member 2 located on the outside of the first housing wall 111" can be performed after "connecting the housing body 11 to the housing cover 12" (as shown in Figures 18A-18G); or, in other embodiments of this application, "connecting the conductive part 4 extending to the outside of the first housing wall 111 to the pole body 21 of the pole member 2 located on the outside of the first housing wall 111" can also be performed before "fitting the housing body 11 over the battery cell member 3".

[0410] Therefore, by first connecting the housing 11 to the cover 12, and then connecting the terminal component 2 to the cover 12, the housing 11 can be used to house the battery cell component 3 and support the cover 12. This facilitates the positioning and support of the cover 12, enabling the connection between the cover 12 and the adapter structure 22 and improving the reliability of the connection between the cover 12 and the terminal component 2. The connection method between the housing 11 and the cover 12 is not limited; it can be welding, bonding, etc.

[0411] For example, "connecting the adapter 35 through the mounting hole 112 to the outside of the first housing wall and the pole body 21" can be done after "connecting the housing body 11 to the housing cover 12"; or, in other embodiments of this application, "connecting the adapter 35 that extends to the outside of the first housing wall 111 to the pole body 21 of the pole component 2 located on the outside of the first housing wall 111" can also be done before "fitting the housing body 11 over the cell component 3".

[0412] Therefore, by first connecting the housing 11 to the housing cover 12, and then connecting the terminal component 2 to the housing cover 12, the housing 11 can be used to house the battery cell component 3 and support the housing cover 12. This facilitates the positioning and support of the housing cover 12, so as to facilitate the connection between the housing cover 12 and the adapter structure 22, and improves the reliability of the connection between the housing cover 12 and the terminal component 2.

[0413] Referring to Figure 48, in some embodiments, when the end wall of the housing 11 opposite to the opening 113 is the first housing wall 111, before step S20 of inserting the cell component 3 into the receiving cavity 13 through the opening, the method further includes step S27 of wrapping the insulating film 41 around the outside of the cell body 32. Thus, the cell component 3 and the insulating film 41 are inserted into the housing together, facilitating the installation of the insulating film 41 and ensuring insulation between the cell component 3 and the housing component 1.

[0414] Referring to Figure 49, in some embodiments, when the cover 12 is the first shell wall 111, before step S26 where the shell body 11 is fitted onto the outside of the cell component 3, step S28 is also included: wrapping the insulating film 41 around the outside of the cell body 32. Thus, the cell component 3 and the insulating film 41 can also cooperate with the shell body 11 to achieve the insertion operation, facilitating the setting of the insulating film 41 and making it easier to achieve insulation between the cell component 3 and the shell component 1.

[0415] It is understandable that when the cover 12 is the first shell wall 111, the order of "supporting the cell component 3 on the inside of the cover 12" and "extending the tab assembly 33 from the mounting hole 112 so that one end of the cell component 3 with the tab assembly 33 is disposed on the inside of the first shell wall 111 opposite to the first shell wall 111" and "wrapping the insulating film 41 on the outside of the cell body 32" is not specifically restricted. It is only necessary to ensure that the insulating film 41 is covered before the shell body 11 is fitted onto the outside of the cell component 3.

[0416] For example, please refer again to Figures 50A-50F. In some embodiments of this application, when the cover 12 is the first shell wall 111, the inner side of the cover 12 may have an insulating support 42. Before the shell body 11 is fitted over the cell component 3, the cell component 3 is placed with the conductive part 4 connected to it facing downwards, and the cover 12 is placed with the insulating support 42 facing upwards. An insulating film 41 is wrapped around the cell component 3 supported on the top of the insulating support 42, and the insulating film 41 is connected to the insulating support 42. At this time, the step of "fitting the shell body 11 over the cell component 3" specifically includes: "placing the shell body 11 with the opening 113 facing downwards, and fitting the shell body 11 over the cell component 3 covered with the insulating film 41 from top to bottom".

[0417] The step of "placing the battery cell component 3 with the conductive part 4 connected to it facing down and placing the cover 12 with the insulating support 42 facing up" can be performed before "the other end of the adapter 35 passes through the mounting hole 112 and extends to the outside of the first housing wall 111", or it can be performed after "the other end of the adapter 35 passes through the mounting hole 112 and extends to the outside of the first housing wall 111".

[0418] Specifically, the process of "covering the cell component 3 supported on top of the insulating bracket 42 with an insulating film 41, thereby connecting the insulating film 41 to the insulating bracket 42" is performed when the insulating bracket 42 is supported at the bottom of the cell body 32 and the adapter 35 protrudes through the mounting hole 112 to the outside of the first shell wall 111. In this state, the cell component 3 does not require other clamps for support and positioning, facilitating quick operation.

[0419] In the above technical solution, when the cover 12 is the first shell wall 111, when the shell body 11 is fitted onto the battery cell component 3, since the cover 12 is not connected to the battery cell component 3, an insulating bracket 42 is set on the inner side of the cover 12 (i.e. the side away from the battery cell body 32) to support the battery cell component 3 from the bottom. In this way, no other limiting clamps are needed, and the problem of separation between the battery cell component 3 and the cover 2 can be avoided. Thus, during assembly, the shell body 11 can be directly fitted from top to bottom, which simplifies the assembly process and reduces the use of limiting clamps, etc.

[0420] Please refer again to Figures 50A-50F. In some embodiments of this application, when the cover 12 is the first shell wall 111, the assembly of the battery cell 102 can be carried out sequentially as follows: "Place the cell component 3 with the conductive part 4 connected to it facing downwards, and place the cover 12 with the insulating support 42 facing upwards," "Place the cell component 3 and the conductive part 4 connected to it on the inner side of the first shell wall 111, and let the conductive part 4 pass through the mounting hole 112 to the outer side of the first shell wall 111," "Wrap the cell component 3 supported on the top of the insulating support 42 with an insulating film 41, so that the insulating film 41 and the insulating support 42 are in contact." 2. Connect: "Place the shell 11 with the opening 113 facing down, and put the shell 11 over the battery cell component 3 covered with the insulating film 41 from top to bottom." "Connect the shell 11 to the shell cover 12." "Connect the conductive part 4 that extends to the outside of the first shell wall 111 to the pole body 21 of the pole component 2 placed on the outside of the first shell wall 111." "Cover the pole component 2 connected to the conductive part 4 from the outside of the first shell wall 111 onto the mounting hole 112 so that the adapter structure 22 abuts against the outside of the first shell wall 111." "Connect the adapter structure 22 to the first shell wall 111 from the outside of the first shell wall 111."

[0421] For example, referring again to Figures 50A-50F, when assembling the battery cell 102, multiple electrode assemblies 31 are stacked along the thickness direction (e.g., the fourth direction F4) of the electrode assembly 31. The stacked electrode assemblies 31 are bound together using a binding member 8 (such as blue adhesive). The multiple electrode assemblies 311 with the same polarity are stacked and brought together to form a stacked portion 312. The stacked portion 312 is clamped between two clamping portions 4110 of the conductive member 41, and the stacked portion 312 and the clamping portions 4110 are welded together. Thus, a conductive part 4 is obtained, which is composed of a tab 33 and a conductive element 41. The cover 12 is placed below the cell body 32 and the cover 12 is positioned with the insulating support 42 facing upwards. The cell body 32 is supported above the insulating support 42. Then, an insulating film 41 is wrapped around the cell body 32, and the lower end of the insulating film 41 is heat-fused to the insulating support 42. Then, the shell 11 is positioned with the opening 113 facing downwards, and the shell 11 is fitted over the cell body 32 from top to bottom. The lower end of the shell 11 is welded to the cover 12. Next, lay the shell 11 flat, with the mounting hole 112 open in the horizontal direction, connect the conductive part 4 to the pole member 2 located on the outside of the shell cover 12 on the outside of the shell cover 12, and then cover the mounting hole 112 from the outside of the shell cover 12 with the pole member 2 connected to the conductive part 4; then flip the shell 11 so that the shell cover 12 is located above the shell 11 and the pole member 2 is located on the top of the shell cover 12, and weld the adapter structure 22 to the shell cover 12 to fix it.

[0422] Furthermore, in this embodiment, the connection between the cell component 3 and the terminal component 2 is completed first, followed by the assembly connection between the terminal component 2 and the housing component 1, rather than the pre-assembly of the terminal component and the housing component followed by the connection of the cell component and the terminal component. This shortens the length of the conductive part 4 connecting the terminal component 2 and the cell component 3, reduces the redundancy of the conductive part 4 within the housing component 1, reduces the space occupied by the conductive part 4 within the housing component 1, improves the energy density of the battery cell 102, and reduces the risk of short circuits caused by the conductive part 4 being inserted backwards into the cell body 32 of the cell component 3, thus improving the reliability of the battery cell 102. Moreover, this assembly method allows for the assembly of the battery cell 102 regardless of whether the terminal component 2 is placed on the housing body 11 or the housing cover 12, thus allowing for flexible selection of the installation position of the terminal component 2 on the housing component 1. When the terminal post 2 is mounted on the housing 11, it helps to reduce the cracking problem at the connection between the housing 11 and the cover 12 and improves the reliability of the battery cell 102.

[0423] When the end wall opposite the opening 113 of the housing 11 is used as the first housing wall 111, if the electrode component is installed on the first housing wall first and then the cell component is installed into the housing, it is difficult to connect the cell component and the electrode component. In the embodiments of this application, by first connecting the cell component 3 to the terminal component 2, and then connecting the terminal component 2 to the housing component 1, the connection requirements of the cell component 3 and the terminal component 2, as well as the connection requirements of the terminal component 2 and the housing component 1, can be met. When the battery 100 vibrates or deforms, the terminal components 2 connected by the busbar component will pull on each other. Since the terminal component 2 is located on the first housing wall 111 opposite to the opening 113 of the housing body 11, the force on the terminal component 2 will be preferentially transmitted to the housing body 11, and will not directly act on the housing cover 12. This not only extends the distance of force transmission to the connection between the housing body 11 and the housing cover 12 (such as the weld), but also causes the housing body 11 to deform preferentially when subjected to force, thereby reducing the force at the connection between the housing body 11 and the housing cover 12. This can effectively reduce the probability of cracking at the connection between the housing cover 12 and the housing body 11 during the use of the battery 100, and improve the reliability of the battery cell 102. Furthermore, since the connection between the shell 11 and the cover 12 is not prone to cracking, there is no need to increase the wall thickness of the two in order to increase the reliability of the connection, which helps to reduce weight and material costs.

[0424] When the casing 12 serves as the first casing wall 111, if the terminal component is installed on the casing first, and then the terminal component and the cell component are connected, the length of the conductive part needs to be relatively long (e.g., greater than half the width of the casing) to allow the cell component to be located on one side of the casing in the width direction. This results in a long conductive part with significant redundancy after assembly, increasing the risk of the conductive part being inserted into the active material coating and causing a short circuit. In the embodiments of this application, by connecting the terminal component 2 and the cell component 3 first, and then installing the terminal component 2 on the casing 12, the length of the conductive part 4 is such that the cell component 3 can be located on one side of the width direction of the terminal component 2 when connecting the terminal component 2 and the cell component 3. This shortens the length of the conductive part 4 (e.g., greater than half the width of the terminal component 2), reduces the redundancy of the conductive part 4 after assembly, lowers the risk of the conductive part 4 being inserted into the cell body 32 and causing a short circuit, improves the reliability of the battery cell 102, and reduces the material and cost of the conductive part 4.

[0425] As can be seen, the above-described configuration of this embodiment allows for unrestricted assembly position of the terminal post 2 on the housing component 1. The terminal post 2 can be mounted on either the housing body 11 or the housing cover 12, enabling flexible selection of its installation position on the housing component 1. This facilitates meeting the production needs of different types of battery cells 102. Specifically, when the terminal post 2 is mounted on the housing body 11, it helps mitigate cracking issues at the connection between the housing body 11 and the housing cover 12, improving the reliability of the battery cell 102. Conversely, when the terminal post 2 is mounted on the housing cover 12, it shortens the length of the conductive portion 4, reducing redundancy after assembly, lowering the risk of reverse insertion, and further enhancing the reliability of the battery cell 102.

[0426] Thirdly, embodiments of this application provide a battery 100, including the aforementioned battery cell 102. It is worth noting that the battery 100 according to embodiments of this application may or may not include a casing 101. Since the reliability of the battery cell 102 according to embodiments of this application is improved, it is beneficial to improve the performance of the battery 100.

[0427] For example, the battery 100 may further include a busbar, and there are multiple battery cells 102, with at least two connected electrically 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 positive terminal 2 of one battery cell 102 is connected to the negative terminal 2 of the next battery cell 102 through a busbar, while the negative terminal 2 of the same battery cell 102 is connected to the positive terminal 2 of the previous battery cell 102 through another busbar.

[0428] For example, referring to FIG2, the battery 100 includes a housing 101, and multiple battery cells 102 are housed in the housing 101. The bottom of the housing 101 is a housing bottom plate 1013. The battery cell component 3 is disposed on the side of the housing component 1 facing the housing bottom plate 1013, or on the side of the housing component 1 away from the housing bottom plate 1013.

[0429] During the use of the battery 100, such as in vehicle use, the bottom plate 1013 of the casing is located at the bottom of the casing 101 in the direction of gravity. Therefore, when the cell component 3 is located on the side of the casing component 1 facing the bottom plate 1013, it means the cell component 3 is located at the bottom of the casing component 1 in the direction of gravity; conversely, when the cell component 3 is located on the side of the casing component 1 away from the bottom plate 1013, it means the cell component 3 is located at the top of the casing component 1 in the direction of gravity. Thus, the relative position of the terminal component 2 and the bottom plate 1013 is not limited, allowing for flexible arrangement of the battery cell 102 and the casing 101.

[0430] Fourthly, embodiments of this application provide an electrical device 1000, including a battery 100 according to any of the above-described solutions, the battery 100 being used to provide electrical energy to the electrical device 1000. The electrical device 1000 can be any of the aforementioned devices or systems using the battery 100. Because the performance of the battery 100 is improved, it is beneficial to enhance the power consumption performance of the electrical device 1000.

[0431] The following describes several specific embodiments of the battery cell 102 and its assembly method.

[0432] Example 1

[0433] Referring to Figures 37A-37E, the housing component 1 has a receiving cavity 13 and includes a housing body 11 that forms the receiving cavity 13. One end of the housing body 11 has an opening 113. The housing cover 12 is flat and covers the opening 113. The end of the housing body 11 opposite to the opening 113 is a first housing wall 111, which has a mounting hole 112. The electrode component 2 is mounted on the first housing wall 111 and covers the mounting hole 112. The cell component 3 includes a stack of multiple cell assemblies 31 to have a cell body 32 received in the receiving cavity 13 and a tab assembly 33 connected to the cell body 32. The tab assembly 33 is connected to the electrode component 2 via an adapter 5, and a part of the adapter 5 is housed in the receiving groove 5 formed by the electrode component 2. The pole component 2 is in a very simple form, including a pole body 21, a connecting structure 22, and an insulating structure 23. The connecting structure 22 surrounds the pole body 21, and the insulating structure 23 is insulated between the pole body 21 and the connecting structure 22. The connecting structure 22 is connected to the first shell wall 111, and the pole body 21 is connected to the tab assembly 33.

[0434] Referring to Figures 37A-37E, during the processing of the battery cell 102, multiple battery cell assemblies 31 are stacked along the thickness direction (e.g., the fourth direction F4) of the cell assembly 31. The multiple battery cell assemblies 31 are stacked and connected with multi-layered tabs 311 of the same polarity to form a first gathering portion 332. Then, the first gathering portion 332 is connected to the adapter 35. The cell component 3 is installed into the housing 11 with the tab assembly 33 facing the mounting hole 112 relative to the cell body 32. As the cell component 3 is installed into the housing 11, the adapter 35 passes through to the outside of the mounting hole 112. The adapter 35 is connected to the pole component 2 placed on the outside of the first housing wall 111. Then, the pole component 2 connected with the adapter 35 covers the mounting hole 112 from the outside of the first housing wall 111. Finally, the adapter structure 22 is welded and fixed to the first housing wall 111.

[0435] The welding position of the pole piece 2 and the gathering part 313 is located outside the housing 11, which can improve the problem of conductive debris formed during the welding process entering the housing 11 and causing damage to the battery cell 3.

[0436] Example 2

[0437] Referring to Figures 39A-39D, the housing component 1 has a receiving cavity 13 and includes a shell body 11 that forms the receiving cavity 13. One end of the shell body 11 has an opening 113, and the end of the shell body 11 opposite to the opening 113 is a first shell wall 111. The first shell wall 111 has a mounting hole 112. The electrode component 2 is mounted on the first shell wall 111 and covers the mounting hole 112. The cell component 3 includes a plurality of stacked cell assemblies 31 to have a cell body 32 housed in the receiving cavity 13, and a tab assembly 33 connected to the cell body 32. The tab assembly 33 is connected to the electrode component 2. The electrode component 2 includes an electrode body 21, a transition structure 22, and an insulating structure 23. The transition structure 22 surrounds the electrode body 21, and the insulating structure 23 is insulatingly fitted between the electrode body 21 and the transition structure 22. The transition structure 22 is connected to the first shell wall 111, and the electrode body 21 is connected to the tab assembly 33.

[0438] Referring to Figures 39A-39D, during the processing of the battery cell 102, multiple battery cell assemblies 31 are stacked along the thickness direction (e.g., the fourth direction F4) of the cell assembly 31. The multiple battery cell assemblies 31 are stacked and connected with multi-layered tabs 311 of the same polarity to form a first gathering part 332. Then, the first gathering part 332 is connected to the terminal post 2 through the adapter 35. According to the direction of the terminal post 2 relative to the battery cell body 32 and facing the mounting hole 112, the battery cell 3 and the terminal post 2 connected to the first gathering part 332 are installed into the housing 11. As the battery cell 3 is installed into the housing 11, the terminal post 2 passes through the mounting hole 112 to the outside of the first housing wall 111. Then, the terminal post 2 connected with the gathering part 313 covers the mounting hole 112 from the outside of the first housing wall 111. Finally, the adapter structure 22 is welded and fixed to the first housing wall 111.

[0439] When the electrode component 2 is welded to the retractable part 313, it is not yet installed in the housing 11, which can improve the problem of conductive debris formed during the welding process entering the housing 11 and causing damage to the battery cell component 3.

[0440] It is worth noting that the form of the adapter structure 22 of the pole component 2 in the above embodiments is not limited, the form of the insulation structure 23 is not limited, and the shape of the pole body 21 is not limited. All of them can refer to any of the above embodiments of this application, and will not be elaborated here.

[0441] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0442] 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, include: A housing component having a receiving cavity and including a first housing wall that participates in defining the receiving cavity; The pole piece is mounted on the first housing wall and includes a pole body; A battery cell component includes a battery cell body and an adapter. The battery cell body is disposed in the receiving cavity and has a tab assembly connected to its end. The tab assembly is electrically connected to the terminal body through the adapter, and the adapter supports the free end of the tab assembly.

2. The battery cell according to claim 1, wherein, The electrode assembly includes multiple electrode tabs, which converge and connect at a position away from the battery cell body to form a first folded portion at the free end. At least a portion of the first folded portion is connected to a part of the adapter on a side away from the battery cell body.

3. The battery cell according to claim 2, wherein, The adapter includes a first connecting portion and a second connecting portion. The first connecting portion is connected to the pole post component, and the second connecting portion is connected to and supports the first retractable portion. The orthographic projection of at least a portion of the first gathering portion onto the first shell wall is within the orthographic projection range of the second connecting portion onto the first shell wall, and the thickness of the second connecting portion is greater than or equal to the thickness of the first gathering portion.

4. The battery cell according to claim 2 or 3, wherein, The multiple tabs of the tab assembly converge near the main body of the battery cell to form a second converged portion. One end of the second converged portion is bent and connected to the first converged portion, and the other end is connected to the main body of the battery cell. The end face of the adapter connected to the first converged portion extends to the bent position near the second converged portion.

5. The battery cell according to any one of claims 1-4, wherein, The tab assembly is bent to form a first opening groove, and the free end defines at least a portion of the groove wall of the first opening groove near the pole body. The adapter extends into the first opening groove and abuts against the free end.

6. The battery cell according to claim 5, wherein, The adapter is bent to form a second opening slot adjacent to the first opening slot and located on the side of the first opening slot facing the pole body. The openings of the second opening slot and the first opening slot are arranged at an angle.

7. The battery cell according to any one of claims 1-6, wherein, The adapter has a clamping structure at the end away from the pole body. The clamping structure supports the free end and includes two opposing clamping parts. The free end is clamped between the two clamping parts and connected to each clamping part.

8. The battery cell according to any one of claims 1-7, wherein, The adapter includes a first connecting part, a bending part, and a second connecting part. The first connecting part and the second connecting part are opposite to each other. The bending part is bent and connected between the first connecting part and the second connecting part. The first connecting part is connected to the pole body, and the second connecting part supports the free end.

9. The battery cell according to claim 8, wherein, The thickness of the bent portion is less than the thickness of at least one of the first connecting portion and the second connecting portion; and / or, In the direction extending from the central axis of the bend, the width of the bend is less than the width of at least one of the first connecting portion and the second connecting portion.

10. The battery cell according to any one of claims 1-9, wherein, The adapter includes multiple adapter foils, which are stacked and connected in a manner that forms a first connecting part and a second connecting part at intervals. The first connecting part is connected to the pole body, and the second connecting part is connected to the free end.

11. The battery cell according to claim 10, wherein, The adapter forms a third connecting portion in the portion between the first connecting portion and the second connecting portion, and the third connecting portion is bent to connect the first connecting portion and the second connecting portion.

12. The battery cell according to claim 10 or 11, wherein, The plurality of adapter foils include at least one first adapter foil and at least one second adapter foil, the first adapter foil and the second adapter foil being respectively connected to both sides of the thickness of the free end.

13. The battery cell according to any one of claims 1-12, wherein, Multiple battery cell bodies arranged sequentially along a second direction constitute a battery cell group. All the free ends of the battery cell group extend toward the middle position of the battery cell group in the second direction and are connected to form a first convergence part. The adapter supports the first convergence part.

14. The battery cell according to claim 13, wherein, In the second direction, the midpoint of the cell assembly in the second direction is taken as the midpoint of the central position, and the size of the central position is less than or equal to 1 / 2 of the size of one of the cell bodies.

15. The battery cell according to claim 13 or 14, wherein, The battery cell assembly consists of multiple groups arranged sequentially along the second direction, and the adapter supports all the first gathering parts.

16. The battery cell according to claim 15, wherein, The adapter includes a main structure and multiple branch structures. The main structure is connected to the pole body. Each branch structure is connected to the end of the main structure away from the pole body and includes at least one level of branch segment, so that the adapter is constructed into a fractal tree structure. Each last level of the branch segment of the branch structure supports a first gathering portion.

17. The battery cell according to claim 16, wherein, The adapter includes a first connecting portion, a bending portion, and a second connecting portion, the first connecting portion and the second connecting portion being opposite to each other, the bending portion being bent and connected between the first connecting portion and the second connecting portion, and at least a portion of the second connecting portion being configured as the plurality of branch structures.

18. The battery cell according to claim 16 or 17, wherein, The connection point between the main structure and the branch structure is located at the center of all the battery cells in the first direction.

19. The battery cell according to any one of claims 13-18, wherein, The number of the main body cells in the cell assembly is either odd or even; and / or, The number of battery cell bodies in multiple battery cell groups may be equal or unequal.

20. The battery cell according to any one of claims 1-19, wherein, Also includes: An insulating component is disposed within the receiving cavity and has a perforation formed therein. The insulating component blocks the portion of the electrode assembly and / or the adapter that passes through the perforation to the side of the insulating component opposite to the cell body from the cell body.

21. The battery cell according to claim 20, wherein, The insulating component includes: An insulating film fully covers the battery cell body. The insulating film has a perforation formed at a position opposite to the first shell wall. The portion of the insulating film surrounding the perforation blocks the portion of the electrode assembly that passes through the perforation to the side of the insulating film facing the electrode body from the battery cell body.

22. The battery cell according to claim 20 or 21, wherein, The insulating component includes: An insulating support is disposed on the side of the cell body facing the first shell wall. The insulating support has a perforation at the position opposite to the electrode component. The portion of the insulating support surrounding the perforation is blocked between the adapter and the cell body.

23. The battery cell according to any one of claims 1-22, wherein, The pole component further includes a transition structure and an insulating structure. The transition structure surrounds the pole body and is connected to the first shell wall. The insulating structure is insulated between the transition structure and the pole body.

24. The battery cell according to claim 23, wherein, The insulating structure includes a sealing structure that is circumferentially disposed on the side of the adapter structure facing the pole body, and is at least partially clamped between the adapter structure and the pole body in the inward and outward directions of the first shell wall.

25. The battery cell according to claim 24, wherein, The electrode body includes a peripheral portion, and the adapter structure is clamped on both sides of the peripheral portion in the inward and outward directions of the first shell wall by the insulating structure. The sealing structure is clamped between the side of the peripheral portion facing the cell component and the adapter structure.

26. The battery cell according to claim 24, wherein, The adapter structure includes a mating ring portion, the pole body includes a through portion passing through the mating ring portion, and an inner limiting portion and an outer limiting portion connected to the through portion and clamped on both sides of the mating ring portion, and at least a portion of the sealing structure is clamped between the mating ring portion and the inner limiting portion.

27. The battery cell according to any one of claims 1-26, wherein, The electrode component forms a receiving groove that is recessed relative to the first shell wall in a direction away from the cell component and open in a direction towards the cell component, and at least a portion of the adapter is received in the receiving groove.

28. The battery cell according to any one of claims 1-27, wherein, The housing component includes a housing body and a housing cover. The housing body is a single piece with one end open, and the housing cover is located at the open end of the housing body. The end of the shell body opposite to the shell cover is the first shell wall; Alternatively, the shell cover may be the first shell wall.

29. The battery cell according to any one of claims 1-28, wherein, Also includes: A pressure relief component is located on the housing component and is situated on the same side or opposite side to the pole component.

30. A processing method, wherein, The processing method is used to process a battery cell according to any one of claims 1-29, and the processing method includes: The battery cell component is installed into the receiving cavity, and one end of the battery cell component with the tab assembly is disposed on the inner side of the first shell wall opposite to the first shell wall; The pole post component is installed on the first housing wall, and the tab assembly is connected to the pole post body through the adapter, with the adapter supporting the free end of the tab assembly.

31. The processing method according to claim 30, wherein, The first shell wall has mounting holes; The steps of mounting the pole member to the first housing wall, connecting the tab assembly to the pole body via the adapter, and having the adapter support the free end of the tab assembly include: One end of the adapter is connected to the tab assembly, and the other end passes through the mounting hole to the outside of the first shell wall and is connected to the pole body. The pole piece connected to the adapter is placed over the mounting hole from the inside or outside of the first housing wall; or, The steps of mounting the pole member to the first housing wall, connecting the tab assembly to the pole body via the adapter, and having the adapter support the free end of the tab assembly include: The battery cell component is placed inside the first housing wall, and one end of the adapter is connected to the tab assembly, and the other end is connected to the electrode body. After the pole component connected to the adapter is passed through the mounting hole, it is placed over the mounting hole from the inside or outside of the first housing wall.

32. The processing method according to claim 31, wherein, The electrode assembly includes multiple electrode plates; Before connecting the electrode assembly to the adapter, the method further includes bringing together a plurality of electrode pieces to form a stacked portion at the free end; The step of connecting one end of the adapter to the electrode assembly includes: The plurality of electrode tabs of the electrode assembly are connected at the stacked portion to form the first gathering portion, and at least a portion of the first gathering portion is connected to the adapter; or... At least a portion of the stacked portion is connected to the adapter.

33. The processing method according to claim 31 or 32, wherein, The adapter has a clamping structure at the end away from the pole body, and includes two clamping parts arranged opposite to each other. The step of connecting one end of the adapter to the electrode assembly includes: The two clamping parts clamp the free end from both sides; Both clamping parts are connected to the free end.

34. The processing method according to any one of claims 31-33, wherein, The adapter includes multiple adapter foils; Before connecting one end of the adapter to the electrode assembly, the following is also included: Multiple adapter foils are stacked together; Connect the stacked regions to form the first connecting part; The steps of connecting one end of the adapter to the electrode assembly and the other end to the electrode post body include: A portion of the stacked area of ​​the multiple adapter foils is connected to the free end, so that the stacked portion forms a second connection portion spaced apart from the first connection portion; Connect the first connecting part to the pole body.

35. The processing method according to any one of claims 31-34, wherein, In the step of placing the pole member connected to the adapter onto the mounting hole from the inside or outside of the first housing wall, or placing the pole member connected to the adapter through the mounting hole and then onto the mounting hole from the inside or outside of the first housing wall: When the pole piece is installed on the first housing wall, the portion of the pole piece and the adapter connected between the first housing wall and the cell body is bent.

36. The processing method according to claim 35, wherein, The battery cell includes an insulating support located inside the first housing wall; The step of bending the portion of the electrode assembly located between the first housing wall and the cell body after the electrode assembly and the adapter are connected when the electrode post component is installed on the first housing wall includes: When the pole piece is installed on the first housing wall, the portion of the pole piece and the adapter connected between the first housing wall and the cell body is bent to form a first opening groove, and the free end defines at least a portion of the groove wall on the side of the first opening groove near the pole piece body. Part of the insulating bracket is inserted into the first opening slot.

37. The processing method according to claim 35, wherein, The battery cell includes an insulating support located inside the first housing wall; The step of bending the portion of the electrode assembly located between the first housing wall and the cell body after the electrode assembly and the adapter are connected when the electrode post component is installed on the first housing wall includes: When the pole piece is installed on the first housing wall, the portion between the first housing wall and the cell body after the pole tab assembly and the adapter are connected is bent to form a first opening groove, and a second opening groove is adjacent to the first opening groove and located on the side of the first opening groove facing the pole body. The opening orientations of the second opening groove and the first opening groove are arranged at an angle. Part of the insulating bracket is inserted into the first opening slot and the second opening slot.

38. The processing method according to any one of claims 35-37, wherein, The step of connecting the other end of the adapter to the pole body includes: Adjust the angle of the electrode component so that the normal of the inner end face of the electrode body is close to the stacking direction of the multiple battery cell bodies. The step of covering the pole component connected to the adapter with the mounting hole includes: The angle of the electrode component is adjusted on the outside of the first shell wall so that the normal of the inner end face of the electrode body is close to perpendicular to the stacking direction of the multiple battery cell bodies, and the electrode group is bent and deformed to form a first opening groove, and the adapter is bent and deformed to form a second opening groove. The openings of the first opening groove and the second opening groove are arranged at an angle.

39. The processing method according to any one of claims 30-38, wherein, The housing component includes a housing body and a housing cover, the housing body having an opening; When the end wall opposite the opening of the housing is the first housing wall, the step of installing the battery cell component into the receiving cavity and positioning one end of the battery cell component with the tab assembly inside the first housing wall and opposite to the first housing wall includes: The battery cell component is inserted into the receiving cavity through the opening; The tab assembly extends out of the mounting hole, such that one end of the cell component with the tab assembly is disposed opposite to the first housing wall on the inner side of the first housing wall. The shell cover is closed over the opening; When the housing cover is the first housing wall, the steps of installing the battery cell component into the receiving cavity and positioning one end of the battery cell component with the tab assembly opposite to the first housing wall on the inner side of the first housing wall include: The battery cell component is supported on the inside of the casing. The tab assembly extends out of the mounting hole, such that one end of the cell component with the tab assembly is disposed opposite to the first housing wall on the inner side of the first housing wall. The housing is fitted onto the outside of the battery cell component and connected to the housing cover.

40. The processing method according to claim 39, wherein, When the end wall opposite the opening of the housing is the first housing wall, before the cell component is inserted into the receiving cavity from the opening, the method further includes wrapping an insulating film around the outside of the cell body. When the shell cover is the first shell wall, before the shell body is fitted onto the outside of the battery cell component, the method further includes wrapping an insulating film around the outside of the battery cell body.

41. A battery, wherein, Includes the battery cell according to any one of claims 1-29.

42. The battery according to claim 41, wherein, The battery includes a housing, and the battery cells are multiple and housed in the housing. The bottom of the housing is a housing bottom plate. The terminal post is located on the side of the housing component facing the housing bottom plate, or on the side of the housing component away from the housing bottom plate.

43. An electrical appliance, wherein, Includes the battery according to claim 41 or 42.

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