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), pole components (2), and a battery core component (3). The casing component (1) has an accommodating cavity (13) and comprises a first casing wall (111) that participates in defining the accommodating cavity (13). The pole components (2) are mounted on the first casing wall (111) and each comprise a pole body (21). The battery core component (3) comprises at least one battery core group (32A), the battery core group (32A) comprises n battery core bodies (32), the n battery core bodies (32) are all arranged in the accommodating cavity (13) and are arranged sequentially in a first direction (F1). A tab group (33) is connected to an end of each battery core body (32), all tab groups (33) of the battery core group (32A) extend toward the middle portion of the battery core group (32A) in the first direction (F1) and are connected to form a tab portion (332), and the tab portion (332) is electrically connected to the pole body (21), wherein n≥1 and n is a positive integer.

Description

Battery monomer, processing method thereof, battery and electric device TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery monomer, a processing method thereof, a battery and an electric device. BACKGROUND

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

[0003] In the related art, the power battery includes a battery monomer. The tab of the battery monomer is electrically connected to the pole. The arrangement of the tab usually affects the reliability of the battery monomer, and needs to be further improved.

[0004] SUMMARY

[0005] The embodiments of the present application provide a battery monomer, a processing method thereof, a battery and an electric device, which can improve the reliability of the battery monomer.

[0006] In a first aspect, the embodiments of the present application provide a battery monomer, comprising: a shell component having a receiving cavity and comprising a first shell wall participating in defining the receiving cavity; a pole component installed on the first shell wall and comprising a pole main body; and a cell component comprising at least one cell group, the cell group comprising n cell main bodies, the n cell main bodies being arranged in the receiving cavity and sequentially arranged along a first direction, each cell main body being connected with a tab group, all tab groups of the cell group extending towards a middle position of the cell group in the first direction and connected to form a tab part, the tab part being electrically connected with the pole main body, n being a positive integer and n≥1.

[0007] In the above technical solution, all tab groups of the cell group extend towards the middle position of the cell group in the first direction and are connected to form a tab part. On the one hand, the number of the tab part is one. Compared with batchwise and multiple folding, the one-time folding process is simple and has lower cost. Moreover, compared with batchwise and multiple folding, the folding process does not need to consider the number of the cell main bodies. No matter how many the number of the cell main bodies is, the cell main bodies can be directly folded at one time. On the other hand, the central folding forms a tab part, which can shorten the average length of the multiple tab pieces in the tab group compared with offset folding. Thus, the redundancy of the tab group can be improved, the risk of the tab group being inserted into the cell main body or the root position of the tab group connected with the cell main body can be reduced, and the problems of wrinkling, bending and breaking of the tab pieces of the tab group can be improved, thereby improving the reliability of the battery monomer.

[0008] In some embodiments, the middle position is the midpoint of the cell group in the first direction. In the first direction, the size of the middle position is less than or equal to 1 / 2 of the size of one cell main body.

[0009] In the technical solution, the middle position is not an absolute midpoint, but a small range of area formed around the midpoint. This arrangement can shorten the length of the tab group, facilitate the consideration of different assembly and use requirements, reduce the assembly requirements, and improve the applicability and practicality of the battery monomer.

[0010] In some embodiments, the battery monomer includes m groups of cell groups, m is a positive integer greater than or equal to 1, m is 1 and n is 1; or at least one of m and n is greater than or equal to 2.

[0011] In the technical solution, by setting the number of cell groups and the number of cell bodies in the cell group, the structural flexibility and diversity of the battery monomer can be designed, and the applicability and practicality of the battery monomer can be improved.

[0012] In some embodiments, the number of cell bodies of at least one group of cell groups is odd; and / or, the number of cell bodies of at least one group of cell groups is even.

[0013] In the technical solution, generally, when the number of cell bodies in the cell group exceeds two, if the number of cell bodies is odd, the two sides of the multiple cell bodies cannot be gathered respectively, and therefore, by the one-time middle gathering method, the odd number of cell bodies can be gathered at one time. Similarly, this also applies to the number of cell bodies in the cell group being even. Therefore, by such an arrangement, the connection of the cell bodies in the battery monomer can be diversified, the structural flexibility and diversity of the battery monomer can be designed, and the applicability and practicality of the battery monomer can be improved.

[0014] In some embodiments, the battery monomer includes m groups of cell groups arranged in sequence along a first direction, m is a positive integer greater than or equal to 2, and the number of cell bodies of the multiple groups of cell groups is equal or unequal.

[0015] In the technical solution, the design of the cell group is flexible, which can improve the applicability and practicality of the battery monomer.

[0016] In some embodiments, the cell part further includes an adapter, and the tab part is electrically connected to the pole body through the adapter.

[0017] In the technical solution, the adapter indirectly connects the tab part and the pole body, which can shorten the length of the tab part, improve the problems such as wrinkling, bending and breaking of the tab sheet, and by flexibly designing the shape and material of the adapter, the connection difficulty with the pole body can be reduced, and the connection convenience of the adapter with the pole body can be improved.

[0018] In some embodiments, the adapter includes a main structure connected with the pole main body and a plurality of branch structures, each of which is connected at an end of the main structure away from the pole main body and includes at least one branch segment, so that the adapter is configured as a fractal dendritic structure, and each last branch segment of the branch structure is connected with a pole lug.

[0019] In the above technical solution, the adapter is configured as a fractal dendritic structure, so that the adapter can realize electrical connection between all the cell main bodies 32 and the pole main body, and the adapter can connect a larger number of cell main bodies, and the adapter occupies a relatively small space.

[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 are opposite to each other, the bending portion is bent and connected between the first connecting portion and the second connecting portion, and at least part of the second connecting portion is configured as a plurality of branch structures.

[0021] In the above technical solution, the bending portion is bent and connected between the first connecting portion and the second connecting portion, and at least part of the second connecting portion is configured as a plurality of branch structures, so that all the pole lug groups are electrically connected with the same pole main body, the structure of the adapter is simplified, the bent adapter can play a role of buffering and supporting, which is conducive to reducing the risk of the cell components impacting the shell components and improving the reliability of the battery monomer.

[0022] In some embodiments, the connection position of the main structure and the branch structure is located at a middle position of the m groups of cell groups in the first direction.

[0023] In the above technical solution, the connection position of the main structure and the branch structure is located at a middle position of all the cell groups in the first direction, so that the length of the branch structure is shortened on the premise that the branch structure reliably supports the pole lug groups, which is conducive to reducing the occupied space of the adapter.

[0024] In some embodiments, the extension length of the adapter is L1, L1>b+λ / 2, b is the extension length of the part of the adapter connected with the pole lug, the pole main body has a welding surface, part of the welding surface is welded with the adapter sheet, and λ is the size of the welding surface in the first direction.

[0025] In the above technical solution, the extension length of the adapter is L1>a+λ / 2, so that the adapter has a larger connection length with the pole lug and a larger connection length with the pole main body, so as to realize reliable electrical connection between the pole lug group and the pole main body.

[0026] In some embodiments, L1≥b+λ / 2+W / 2, and W is the size of the pole component in the first direction.

[0027] In the technical solution, the extension length L1 of the adapter is greater than or equal to b+λ / 2+W / 2, which facilitates further increasing the connection length between the adapter and the tab part and the connection length between the adapter and the pole body, and improves the connection reliability of the tab group and the pole body.

[0028] In some embodiments, all the tab groups of the cell group, or the conductive parts formed after the tab parts are connected with the adapters, are bent to form an open slot; or all the tab groups of the cell group, or the conductive parts formed after the tab parts are connected with the adapters, are bent to form multiple open slots, the multiple open slots are sequentially arranged from the cell body to the pole part, and the openings of the adjacent two open slots are arranged at an included angle.

[0029] In the technical solution, the conductive part is bent to form at least one open slot, so that the conductive part can play a buffering and supporting role, which is conducive to reducing the risk of the cell part impacting the shell part and improving the reliability of the battery monomer.

[0030] In some embodiments, one end of the adapter away from the pole body has a clamping structure, the clamping structure includes two oppositely arranged clamping parts, the tab part is clamped between the two clamping parts, and is connected with each clamping part.

[0031] In the technical solution, the tab part is clamped between the two clamping parts, so that the two clamping parts can limit the tab part, which is conducive to improving the connection reliability of the multiple tab pieces of the tab group in the tab part, and facilitating that one clamping part adjacent to the cell body in the two clamping parts can support the tab part on the side of the tab part away from the pole body, so as to prevent the free end of the tab group from moving towards the cell body, and reduce the risk of reverse insertion. In addition, the two clamping parts can protect the tab part to reduce the risk of cracking of the tab pieces of the tab part due to thin thickness, which is conducive to improving the welding quality between the tab group and the adapter piece and improving the connection reliability of the tab group and the adapter piece.

[0032] In some embodiments, 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, the bending part is bent and connected between the first connecting part and the second connecting part, the first connecting part is connected with the pole body, and the second connecting part is connected with the tab part.

[0033] In the technical solution, the bent adapter can play a buffering and supporting role on the premise of reliably supporting the free end of the tab group, which is conducive to reducing the risk of the cell part impacting the shell part and improving the reliability of the battery monomer.

[0034] In some embodiments, the thickness of the bending portion is less than the thickness of at least one of the first connecting portion and the second connecting portion; and / or, in the extension direction of the central axis of the bending portion, the width of the bending portion is less than the width of at least one of the first connecting portion and the second connecting portion.

[0035] 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 is reduced in the form of reducing the thickness and shortening the width at the bending portion, so that the first connecting portion and the second connecting portion have a certain rigidity respectively, and the reliable connection of the adapter with the pole body and the reliable connection of the adapter with the tab group are realized, and at the same time the bending portion is weakened, facilitating the bending of the adapter at the bending portion. Especially for the case where the structure of the adapter is generally plate-shaped before assembly and the structure has a bending position after assembly, at this time the adapter can realize the soft connection between the pole body and the cell body, and facilitate the bending of the adapter at the bending portion during assembly, thereby improving the assembly convenience.

[0036] In some embodiments, the adapter includes a plurality of adapter foils, the plurality of adapter foils are stacked and arranged, and a part of the stacked foils are connected to form the first connecting portion and the second connecting portion arranged at intervals, the first connecting portion is connected with the pole body, and the second connecting portion is connected with the tab portion.

[0037] In the above technical solution, by setting the adapter to include a plurality of stacked adapter foils, the number of adapter foils and the structure and size of a single adapter foil can be flexibly set, so that the adapter foil has flexible structure and size design, improving the applicability and practicality of the adapter foil, and facilitating the reduction of connection difficulty with the pole body and the tab group, and improving the assembly convenience. In addition, since a part of the plurality of stacked adapter foils are connected to form the first connecting portion and the second connecting portion arranged at intervals, the surfaces of the adjacent two adapter foils are partially connected and not fully connected, which is beneficial to reduce the processing procedure of the adapter. Moreover, since the thickness of a single adapter foil is relatively small compared to the thickness of the adapter, the plurality of adapter foils are equivalent to multiple thin plates, and the adapter formed by the plurality of adapter foils is more easily bent compared to the adapter foil formed in one piece, and the rigidity of a part of the adapter is relatively small, facilitating the bending of the adapter at the above-mentioned area with small rigidity during the assembly of the battery monomer, so that the above-mentioned adapter facilitates the soft connection between the tab group and the pole body, and the adapter is bent into a certain form during the assembly of the battery monomer, thereby meeting the design requirements.

[0038] In some embodiments, a part of the adapter between the first connecting portion and the second connecting portion forms a third connecting portion, and the third connecting portion is bent to connect the first connecting portion and the second connecting portion.

[0039] In the technical solution, the part of the plurality of adapter foils of the adapter corresponding to the third connecting part can be connected, and the rigidity of the third connecting part is smaller than that of the first connecting part and the second connecting part, which facilitates bending at the third connecting part, so that when the structure of the adapter changes during assembly, for example, the third connecting part is not bent before assembly and the third connecting part is bent after assembly, the assembly convenience is improved. In addition, the bent adapter can reliably support the free end of the tab group under the premise of achieving reliable support, which is conducive to reducing the risk of the battery cell component impacting the shell component and improving the reliability of the battery monomer.

[0040] In some embodiments, the plurality of adapter foils includes at least one first adapter foil and at least one second adapter foil, and the first adapter foil and the second adapter foil are respectively connected to the thickness of the tab group.

[0041] In the technical solution, by arranging the first adapter foil and the second adapter foil to be respectively connected to the thickness of the free end, the free end can be separated from the pressing device by the first adapter foil and the second adapter foil to protect the free end, reduce the risk of the tab group cracking due to thin thickness, and improve the welding quality between the tab group and the adapter and the connection reliability of the tab group and the adapter.

[0042] In some embodiments, all tab groups of the battery cell group are folded and bent to form an open slot, the adapter includes a first connecting part and a second connecting part, the first connecting part is connected to the pole part, the second connecting part extends into one of the open slots, and the second connecting part is connected to the tab group to support the tab group.

[0043] In the technical solution, the second connecting part extends into one of the open slots to support the tab group, which is conducive to reducing the risk of short circuit caused by the tab group being inserted into the inside of the battery cell body or being inserted into the root position of the adjacent battery cell body of the tab group, thereby improving the reliability of the battery monomer.

[0044] In some embodiments, the orthographic projection of at least part of the tab group on the first shell wall is located within the orthographic projection range of the second connecting part on the first shell wall, and the thickness of the second connecting part is greater than or equal to the thickness of the tab group.

[0045] In the technical solution, by arranging the orthographic projection of the supported part of the tab group on the first shell wall to be located within the orthographic projection range of the second connecting part, and the thickness of the second connecting part is greater than or equal to the thickness of the tab group, the cross-sectional area of the second connecting part is greater than or equal to the cross-sectional area of the tab group, which is conducive to reducing the resistance at the connection position of the second connecting part and the tab group and improving the overcurrent capacity at the connection position of the second connecting part and the tab group, thereby facilitating the reduction of the internal resistance of the battery monomer and the improvement of the overcurrent capacity of the battery monomer.

[0046] In some embodiments, all the tab pieces of the tab group converge to form a gathered portion near the position of the cell body, one end of the gathered portion is connected with the tab portion by bending, the other end is connected with the cell body, and the end surface of the part connected with the tab portion extends to the position near the bending of the gathered portion.

[0047] In the above technical solution, the end surface of the part connected with the tab portion extends to the position near the bending of the gathered portion, so as to facilitate the adapter to support the entire tab portion and improve the support reliability of the free end. At the same time, since the plurality of tab pieces of the tab group only converge to form the gathered portion without being connected, the adapter can indirectly press the position of the bending of the gathered portion, so as to improve the convergence tightness of the gathered portion, make the gathered portion maintain the preset gathered shape and cannot be dispersed, and be conducive to reducing the risk of inserting the gathered portion into the cell body.

[0048] In some embodiments, the battery monomer further comprises: an insulating component arranged in the accommodation cavity and formed with a through hole, the insulating component blocks the part of the tab group and / or the adapter passing through the through hole to the side of the insulating component away from the cell body from the cell body.

[0049] In the above technical solution, the insulating component can be used to isolate the cell body and the first shell wall of the shell component, reduce the probability of the cell body contacting the first shell wall of the shell component, thereby reducing the risk of the first shell wall of the shell component being corroded due to the naked exposure of the cell body, reducing the risk of the cell body itself failing, and reducing the risk of liquid leakage, thereby improving the reliability and stability of the battery monomer. Moreover, the insulating component blocks the part of the conductive part passing through the through hole to the side of the insulating component away from the cell body from the cell body, so as to separate the part of the conductive part passing through the through hole to the side of the insulating component away from the cell body from the cell body, reduce the probability of the conductive part being inserted into the cell body due to redundancy, thereby reducing the risk of short circuit of the battery monomer and improving the use reliability of the battery monomer.

[0050] In some embodiments, the insulating component comprises: an insulating film fully covering the cell body, the insulating film is formed with a through hole at a position opposite to the first shell wall, and the part of the insulating film surrounding the through hole blocks the part of the tab group passing through the through hole to the side of the insulating film facing the cell body from the cell body.

[0051] In the technical solution, the part of the insulation film surrounding the through hole is arranged between the part of the lug group passing through the through hole to the side of the insulation film facing the pole body and the battery body, so that the size of the through hole on the insulation film is adapted to the size of the lug group, for example, the size of the first avoiding hole is adapted to the thickness of the part of the lug group located at the first avoiding hole. On the one hand, the through hole allows the lug group to pass through smoothly to be electrically connected to the pole body. On the other hand, in the state of passing through the through hole, the insulation film can still cover the position of the plurality of lug pieces of the lug group adjacent to the root of the battery body, further insulating the battery body, reducing the risk of the battery body being exposed, and separating the part of the lug group passing through the through hole from the battery body, reducing the risk of the lug group and / or the adapter being inserted into the battery body and the root of the lug group adjacent to the battery body, and further reducing the risk of short circuit of the battery monomer.

[0052] In some embodiments, the insulation component comprises: an insulation support arranged on the side of the battery body facing the first shell wall, and a through hole is formed in the position of the insulation support opposite to the pole component. The part of the insulation support surrounding the through hole is arranged between the adapter and the battery body.

[0053] In the technical solution, the part of the insulation support surrounding the through hole is arranged between the adapter and the battery body, so that the insulation support can support the adapter to a certain extent, and the free end of the lug group is supported by the adapter. The insulation support can insulate and separate the free end of the lug group from the battery body, reduce the risk of the free end of the lug group being inserted into the battery body and the root of the lug group adjacent to the battery body, reduce the risk of short circuit, and improve the reliability of the battery monomer.

[0054] In some embodiments, the pole component surrounds a receiving groove recessed in a direction away from the battery component and open in a direction facing the battery component, and at least part of the adapter is accommodated in the receiving groove.

[0055] In the technical solution, the receiving groove is arranged to accommodate the adapter, so that the adapter occupies less space in the receiving cavity, the receiving cavity has more space to accommodate the battery body, the volume of the battery body is increased, and the energy density of the battery monomer is increased. Moreover, the receiving groove is open in the direction facing the battery component, so that the adapter can easily extend into the receiving groove, reducing the operation difficulty.

[0056] In some embodiments, the pole component further comprises an adapter structure and an insulation structure, the adapter structure surrounds the pole body and is connected to the first shell wall, and the insulation structure is insulated and cooperates between the adapter structure and the pole body.

[0057] In the technical solution, the pole post component has simple structure and is easy to process. The pole post body and the adapter structure are designed separately based on different factors, so that the pole post component can be flexibly adapted to the connection requirements of different forms of the shell component and the battery cell component, and the application range of the pole post component is increased.

[0058] In some embodiments, the insulation structure includes a sealing structure member, which is annularly arranged on the circumferential side of the adapter structure facing the pole post body and is clamped between the adapter structure and the pole post body in the inner-outer direction of the first shell wall.

[0059] In the technical solution, the at least part of the sealing structure member is clamped between the adapter structure and the pole post body in the inner-outer direction of the first shell wall, so that axial sealing is achieved between the adapter structure and the pole post body. The axial sealing can achieve more reliable sealing effect, and improve the leakage problem of the matching position of the adapter structure and the pole post body. In the embodiments of the present application, the axial sealing is integrated into the pole post component, so that the force acting on the first shell wall in the axial direction is reduced. Moreover, the sealing structure member is annularly arranged on the inner ring of the adapter structure, so that the sealing structure member can be close to the matching position of the adapter structure and the pole post body, which is beneficial to sealing the matching position of the adapter structure and the pole post body in a shorter path, improves the reliability of the sealing, and is beneficial to reducing the size of the sealing structure member and the sealing area, and easily realizes compression sealing, so that the sealing is not easy to fail and the sealing effect is improved.

[0060] In some embodiments, the pole post body includes a peripheral portion, and the adapter structure is clamped on both sides of the peripheral portion in the inner-outer direction of the first shell wall by the insulation structure, and the sealing structure member is clamped between the side of the peripheral portion facing the battery cell component and the adapter structure.

[0061] In the technical solution, the pole post component has simple structure and is easy to process. The pole post body and the adapter structure are designed separately based on different factors, so that the pole post component can be flexibly adapted to the connection requirements of different forms of the shell component and the battery cell component, and the application range of the pole post component is increased.

[0062] In some embodiments, the adapter structure comprises a fitting ring portion, the pole post body comprises a penetrating portion penetrating the fitting ring portion, and an inner limiting portion and an outer limiting portion connected with the penetrating portion and clamped on both sides of the fitting ring portion, and at least part of the sealing structure is clamped between the fitting ring portion and the adapter structure.

[0063] In the above technical solution, the pole post component has a simple structure and is easy to process, and the relative fixation and insulation cooperation of the pole post body and the adapter structure can be simply and effectively realized. The sealing structure is clamped at the cooperation position of the pole post body and the fitting ring portion, so that the sealing structure can be located at the cooperation position of the adapter structure and the pole post body, which is conducive to sealing the cooperation position of the adapter structure and the pole post body in a shorter path, improves the reliability of the sealing, and is conducive to reducing the size of the sealing structure, reducing the sealing area, easily realizing compression sealing of the sealing structure, preventing the sealing from failing, and improving the sealing effect. Moreover, since at least part of the sealing structure is clamped between the fitting ring portion and the inner limiting portion, the sealing structure can be sealed from the side of the fitting ring portion facing the accommodating cavity, and the leakage of electrolyte from the cooperation position of the pole post body and the adapter structure can be more effectively inhibited, thereby improving the sealing effect.

[0064] In some embodiments, the shell component comprises a shell body and a shell cover, the shell body is an integral piece and has an open end, the shell cover is arranged at the open end of the shell body, and the end opposite to the shell cover of the shell body is a first shell wall; or the shell cover is the first shell wall.

[0065] In the above technical solution, the shell component has a flexible structure design, and the pole post component has a flexible arrangement position.

[0066] In some embodiments, the battery monomer further comprises a pressure relief component arranged on the shell component and located on the same side or different side of the pole post component.

[0067] In a second aspect, the embodiments of the present application provide a processing method, characterized in that the processing method is used for processing the above-mentioned battery monomer, and the processing method comprises: extending all the tab groups of the battery cell group towards the middle position of the battery cell group in the first direction; loading the battery cell component into the accommodating cavity, and arranging one end of the tab group of the battery cell component on the inner side of the first shell wall opposite to the first shell wall; and installing the pole post component on the first shell wall, and connecting all the tab groups with the pole post body.

[0068] In the above technical solution, before the battery cell component is loaded into the accommodating cavity, all the tab groups of the battery cell group are first shaped to extend towards the middle position of the battery cell group in the first direction, which can reduce the length of the tab group, improve the redundancy of the tab group, reduce the risk of the tab group being inserted into the battery cell body or being inserted into the root position of the tab group connected with the battery cell body, and is conducive to improving the problems such as wrinkling, bending and breaking of the tab sheet of the tab group, thereby improving the reliability of the battery monomer.

[0069] In some embodiments, the first shell wall is formed with a mounting hole, one end of the cell component is connected with a conductive part, the conductive part includes a tab part, or includes a tab part and an adapter; the step of mounting the pole part to the first shell wall and connecting all the tab groups with the pole body includes: connecting the end of the conductive part away from the cell body with the pole body through the mounting hole to the outside of the first shell wall; covering the pole part connected with the conductive part in the mounting hole from the inside or the outside of the first shell wall; or, the step of mounting the pole part to the first shell wall and connecting all the tab groups with the pole body includes: placing the cell component on the inside of the first shell wall, and connecting the end of the conductive part away from the cell body with the pole body; covering the pole part connected with the conductive part in the mounting hole from the inside or the outside of the first shell wall.

[0070] In the above technical solution, the end of the conductive part away from the cell body is connected with the pole body through the mounting hole to the outside of the first shell wall. Since the conductive part is not connected with the pole part when passing through the mounting hole, the adapter is convenient to pass through the mounting hole, improving the operation convenience. Moreover, since the welding position of the pole part and the conductive part is located outside the shell body, the problem that the conductive debris formed in the welding process enters the inside of the shell body to damage the cell component can be improved. The conductive part is connected with the pole part first, and then the pole part is mounted to the first shell wall. Since the cell component and the pole part are connected first, and then the pole part passes through the mounting hole, when connecting the cell component and the pole part, the problem of avoiding the first shell wall does not need to be considered, or when connecting the cell component and the pole part, the pole part and the cell component are not located on both sides of the first shell wall, thereby facilitating 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 monomer. Moreover, since the welding position of the pole part and the cell component is located outside the shell body, the problem that the conductive debris formed in the welding process enters the inside of the shell body to damage the cell component can be improved. Moreover, the pole part is covered in the mounting hole from the outside of the first shell wall, so that the adapter structure abuts against the outside of the first shell wall, and the connection between the adapter structure and the first shell wall is performed from the outside of the first shell wall, so as to facilitate the assembly and connection of the pole part and the first shell wall, and improve the connection reliability of the pole part and the first shell wall.

[0071] In some embodiments, the pole part connected with the conductive part is covered in the mounting hole from the inside or the outside of the first shell wall, or the pole part connected with the conductive part is covered in the mounting hole from the inside or the outside of the first shell wall after passing through the mounting hole. In the step, when the pole part is mounted to the first shell wall, the part of the conductive part between the first shell wall and the cell body is in a bent shape.

[0072] In the technical solution, the conductive part can play a buffering role, and when the battery monomer is used in a vibrating environment, the impact of the main body of the battery cell on the first shell wall can be reduced, the components of the battery cell can be protected, and the reliability of the battery monomer can be improved. In addition, the pole part is installed on the first shell wall, and the part of the conductive part between the first shell wall and the main body of the battery cell can be in an unfolded state, which facilitates the connection of the tab group and the adapter and / or the connection of the adapter and the main body of the pole, and provides sufficient operation space, for example, facilitating the laying of the part of the conductive part connected to the main body of the pole on the main body of the pole for connection.

[0073] In some embodiments, the battery monomer includes an insulating support inside the first shell wall; when the pole part is installed on the first shell wall, the step of making the part of the conductive part between the first shell wall and the main body of the battery cell into a bent shape includes: when the pole part is installed on the first shell wall, the part of the conductive part between the first shell wall and the main body of the battery cell is bent to form at least one open slot; and the part of the insulating support is inserted into the at least one open slot.

[0074] In the technical solution, the insulating support can prevent the free end from moving towards the main body of the battery cell, which is conducive to further reducing the risk of short circuit caused by the movement of the tab group towards the main body of the battery cell when the battery cell is inserted in reverse, and improving the reliability of the battery monomer.

[0075] In some embodiments, the conductive part includes at least one tab part and an adapter, and when the pole part is installed on the first shell wall, the step of making the part of the conductive part between the first shell wall and the main body of the battery cell into a bent shape includes: when the pole part is installed on the first shell wall, the tab group and the adapter are connected, the tab group is bent to form a first open slot, the adapter is bent to form a second open slot adjacent to the first open slot and located on the side of the first open slot facing the main body of the pole, and the openings of the second open slot and the first open slot are arranged at an included angle; and the part of the insulating support is inserted into at least one of the first open slot and the second open slot.

[0076] In the technical solution, the insulating support can prevent the free end from moving towards the main body of the battery cell, which is conducive to further reducing the risk of short circuit caused by the movement of the tab group towards the main body of the battery cell when the battery cell is inserted in reverse, and improving the reliability of the battery monomer.

[0077] In some embodiments, the step of connecting the end of the conductive part away from the main body of the battery cell to the main body of the pole includes: adjusting the angle of the pole part so that the normal of the inner end face of the main body of the pole is close to the stacking direction of the plurality of main bodies of the battery cell; and the step of covering the pole part connected with the conductive part in the mounting hole includes: adjusting the angle of the pole part on the outer side of the first shell wall so that the normal of the inner end face of the main body of the pole is close to perpendicular to the stacking direction of the plurality of main bodies of the battery cell, and the conductive part is bent to form at least one open slot.

[0078] In the technical solution, the position and angle of the pole post component are first adjusted to make the normal of the inner end face of the pole post body close to the stacking direction of the plurality of battery cell assemblies, and then the part of the adapter connected with the pole post body is laid on the inner end face of the pole post body. After that, the angle of the pole post body does not need to be adjusted again, and there is enough space near the matching position of the part of the adapter connected with the pole post body and the inner end face of the pole post body for the welding operation of the adapter and the pole post body, thereby simplifying the operation and making the length of the tab part shorter. When the angle of the pole post component is adjusted to be connected with the first shell wall, the conductive part is bent to form at least one open slot.

[0079] In some embodiments, one end of the battery cell body is connected with a conductive part including a tab group and an adapter. When the pole post component is installed on the first shell wall, the tab group is bent to form a first open slot after being connected with the adapter, and the adapter extends into the first open slot.

[0080] In the technical solution, the free end of the tab group is supported by the adapter during the assembly process, which can prevent the free end from moving towards the battery cell body, thereby reducing the risk of short circuit caused by the movement of the tab group towards the battery cell body and improving the reliability of the battery monomer.

[0081] In some embodiments, when the pole post component is installed on the first shell wall, the adapter is bent to form a second open slot adjacent to the first open slot and located on the side of the first open slot facing the pole post body. The openings of the second open slot and the first open slot are arranged at an included angle, and at least part of the side slot wall of the second open slot facing the battery cell body extends into the first open slot.

[0082] In the technical solution, the adapter and the tab group can define a serpentine shape to serve as a buffer support, thereby reducing the risk of the battery cell component impacting the shell component and improving the reliability of the battery monomer.

[0083] In some embodiments, one end of the battery cell body is connected with a conductive part including a tab group and an adapter. The tab group includes a plurality of tab pieces. The step of extending all the tab groups of the battery cell group towards the middle position of the battery cell group in the first direction includes: converging the plurality of tab pieces towards the middle position to form a laminated part at the free end; and connecting the laminated part with the adapter.

[0084] In the technical solution, the lamination part can be arranged corresponding to the middle position, so as to reduce the offset of the lamination part relative to the center of the battery cell group in the first direction in the subsequent assembly process; the lamination part is pre-connected first, so that the lamination part forms a first gathered part with a certain rigidity instead of a loose multi-layer foil shape, facilitating the connection of the first gathered part with the adapter, and making the welding of the tab part with the adapter more reliable, and it is not easy to form pores in the weld, which can improve the connection reliability and conductivity of the welding position, and make the conduction of the battery cell part and the pole part more stable and reliable. Without pre-connection, the lamination part is directly connected with the adapter, which is conducive to simplifying the processing procedure and improving the processing efficiency. At the same time of connecting the lamination part with the adapter, the lamination part forms a first gathered part, which also realizes reliable connection of the lamination part with the adapter.

[0085] In some embodiments, the step of connecting the lamination part with the adapter includes connecting the plurality of tab pieces of the tab group at the lamination part position to form a tab part, and connecting at least part of the tab part with the adapter; or directly connecting at least part of the lamination part with the adapter.

[0086] In the technical solution, the lamination part is pre-connected first, so that the lamination part forms a first gathered part with a certain rigidity instead of a loose multi-layer foil shape, facilitating the connection of the first gathered part with the adapter, and making the welding of the tab part with the adapter more reliable, and it is not easy to form pores in the weld, which can improve the connection reliability and conductivity of the welding position, and make the conduction of the battery cell part and the pole part more stable and reliable. Without pre-connection, the lamination part is directly connected with the adapter, which is conducive to simplifying the processing procedure and improving the processing efficiency. At the same time of connecting the lamination part with the adapter, the lamination part forms a first gathered part, which also realizes reliable connection of the lamination part with the adapter.

[0087] In some embodiments, the end of the adapter away from the pole body has a clamping structure, and includes two oppositely arranged clamping parts; the step of connecting the lamination part with the adapter includes clamping the lamination part from both sides of the free end by the two clamping parts; and the two clamping parts are connected with the free end.

[0088] In the technical solution, the two clamping parts can protect the free end, so as to improve the problem that the free end is easy to crack during the connection of the free end with the clamping structure, and improve the connection reliability of the adapter with the tab group.

[0089] In some embodiments, the adapter includes a plurality of adapter foils; before connecting the laminated portion with the adapter, further comprising: stacking the plurality of adapter foils; connecting a partial region of the plurality of adapter foils to form a first connecting portion; and connecting the laminated portion with the adapter includes: connecting the partial region of the plurality of adapter foils with the free end, so that the partial region of the plurality of adapter foils forms a second connecting portion spaced apart from the first connecting portion; and connecting the first connecting portion with the pole body.

[0090] In the above technical solution, the partial region of the plurality of adapter foils is connected to form a first connecting portion, so as to realize the connection of the plurality of adapter foils, improve the compaction of the adapter foils in the first connecting portion, and facilitate the connection of the adapter with the pole component. The connection of the plurality of adapter foils with the free end and the connection of the partial region of the plurality of adapter foils to form a second connecting portion can be performed simultaneously, which is beneficial to simplify the processing procedure.

[0091] In some embodiments, the shell component includes a shell body and a shell cover, and the shell body has an opening; when the end wall opposite to the opening of the shell body is a first shell wall, the steps of loading the battery cell component into the accommodating cavity and arranging the battery cell component on the inner side of the first shell wall opposite to the first shell wall include: loading the battery cell component into the accommodating cavity from the opening; extending the tab group from the mounting hole, so that one end of the battery cell component arranged by the tab group is arranged on the inner side of the first shell wall opposite to the first shell wall; and covering the shell cover on the opening; when the shell cover is the first shell wall, the steps of loading the battery cell component into the accommodating cavity and arranging one end of the battery cell component arranged by the tab group on the inner side of the first shell wall opposite to the first shell wall include: supporting the battery cell component on the inner side of the shell cover; extending the tab group from the mounting hole, so that one end of the battery cell component arranged by the tab group is arranged on the inner side of the first shell wall opposite to the first shell wall; and sleeving the shell body on the outer side of the battery cell component and connecting the shell cover.

[0092] In the above technical solution, by arranging the pole component at the end of the shell body opposite to the opening, the cracking problem at the connection between the shell body and the shell cover is improved, and the reliability of the battery monomer is improved. By completing the connection between the shell body and the shell cover first and then connecting the pole component to the shell cover, the shell body can be used to accommodate the battery cell component and support the shell cover, which is convenient for positioning and supporting the shell cover, facilitating the connection between the shell cover and the adapter structure, and improving the connection reliability of the shell cover and the pole component.

[0093] In some embodiments, when the end wall opposite to the opening of the shell body is a first shell wall, before loading the battery cell component into the accommodating cavity from the opening, further comprising: wrapping the insulating film on the outer side of the battery cell body; and when the shell cover is the first shell wall, before sleeving the shell body on the outer side of the battery cell component, further comprising: wrapping the insulating film on the outer side of the battery cell body.

[0094] In the technical solution, the cell component and the insulating film are implemented together to realize the entering of the shell, facilitating the setting of the insulating film and the insulation setting of the cell component and the shell component.

[0095] In a third aspect, the embodiments of the present application provide a battery, characterized by comprising the battery monomer.

[0096] In the technical solution, the battery monomer can improve the performance of the battery.

[0097] In some embodiments, the battery comprises a box body, the battery monomers are multiple and are contained in the box body, a bottom of the box body is a box bottom plate, the pole component is arranged on a side of the shell component facing the box bottom plate or a side of the shell component away from the box bottom plate.

[0098] In the technical solution, when the pole component of the battery monomer is arranged on the side of the shell component facing the box bottom plate, the battery monomer is in an inverted state, and the product of pressure relief is sprayed in a direction away from the passenger cabin, which is safer; when the pole component of the battery monomer is arranged on the side of the shell component away from the box bottom plate, the battery monomer is in a normal state, and the electrolyte is not easy to leak; therefore, the battery monomer and the box body can be flexibly arranged.

[0099] In a fourth aspect, the embodiments of the present application provide an electric device, comprising the battery.

[0100] In the technical solution, the performance of the battery is improved, and thus the working performance of the electric device is improved. BRIEF DESCRIPTION OF DRAWINGS

[0101] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description, taken in conjunction with the following drawings in which:

[0102] FIG. 1 is a structural schematic diagram of a vehicle according to some embodiments of the present application;

[0103] FIG. 2 is an exploded view of a battery according to some embodiments of the present application;

[0104] FIG. 3 is a structural schematic diagram of a battery monomer according to some embodiments of the present application;

[0105] FIG. 4 is an exploded view of the battery monomer shown in FIG. 3;

[0106] FIG. 5 is an exploded view of a battery monomer according to some embodiments of the present application;

[0107] FIG. 6 is a sectional view of a battery monomer according to some embodiments of the present application, and the conductive part comprises a tab group and an adapter;

[0108] FIG. 7 is a partial schematic diagram of the battery monomer shown in FIG. 6;

[0109] Fig. 8 is a partial cross-sectional view of a battery cell according to some embodiments of the present application, in which the conductive portion does not include a relay member;

[0110] Fig. 9 is a cross-sectional view of a battery cell according to some embodiments of the present application;

[0111] Fig. 10 is a cross-sectional view of a battery cell according to some embodiments of the present application;

[0112] Fig. 11 is a cross-sectional view of a battery cell according to some embodiments of the present application, in which the pole member is in a state in which the cover is set to the first shell wall;

[0113] Fig. 12 is a cross-sectional view of a battery cell according to some embodiments of the present application, in which the pole member is in a state in which the cover is set to the first shell wall;

[0114] Fig. 13 is a cross-sectional view of a battery cell according to some embodiments of the present application, in which the pole member is in a state in which the cover is set to the first shell wall;

[0115] Fig. 14 is a schematic view of a relay member according to some embodiments of the present application;

[0116] Fig. 15 is a schematic view of a relay member according to some embodiments of the present application;

[0117] Fig. 16 is a schematic view of a covering of an insulating film according to some embodiments of the present application;

[0118] Fig. 17 is a schematic view of a covering of an insulating film according to some embodiments of the present application;

[0119] Fig. 18 is a schematic view of an insulating support according to some embodiments of the present application;

[0120] Fig. 19 is a schematic view of an assembly of the insulating support shown in Fig. 18;

[0121] Fig. 20 is a schematic view of an insulating support according to some embodiments of the present application;

[0122] Fig. 21 is a schematic view of an assembly of the insulating support shown in Fig. 20;

[0123] Fig. 22 is a schematic view of a pole member according to some embodiments of the present application;

[0124] Fig. 23 is another schematic view of the pole member shown in Fig. 22;

[0125] Fig. 24 is a view of B in Fig. 23;

[0126] Fig. 25 is a cross-sectional view of C-C in Fig. 22;

[0127] FIG. 26 is a partial cross-sectional view of a battery cell, according to some embodiments of the application;

[0128] FIG. 27 is a partial cross-sectional view of a battery cell, according to some embodiments of the application;

[0129] FIG. 28 is a partial cross-sectional view of a battery cell, according to some embodiments of the application;

[0130] FIG. 29 is a partial cross-sectional view of a battery cell, according to some embodiments of the application;

[0131] FIG. 30 is a partial cross-sectional view of a battery cell, according to some embodiments of the application;

[0132] FIG. 31 is a partial cross-sectional view of a battery cell, according to some embodiments of the application;

[0133] FIG. 32 is a partial cross-sectional view of a battery cell, according to some embodiments of the application, with the post member in a pre-covering first shell wall state;

[0134] FIG. 33 is a partial cross-sectional view of a battery cell, according to some embodiments of the application;

[0135] FIG. 34 is a partial cross-sectional view of a battery cell, according to some embodiments of the application;

[0136] FIG. 35 is a partial cross-sectional view of a battery cell, according to some embodiments of the application;

[0137] FIG. 36 is a flow chart of a method of processing a battery cell, according to some embodiments of the application;

[0138] FIG. 37 is a flow chart of a method of processing a battery cell, according to some embodiments of the application;

[0139] FIGS. 38A-38E are exploded schematic views of a method, according to some embodiments of the application;

[0140] FIG. 39 is a flow chart of a method of processing a battery cell, according to some embodiments of the application;

[0141] FIGS. 40A-40D are exploded schematic views of a method, according to some embodiments of the application;

[0142] FIG. 41 is a flow chart of a method of processing a battery cell, according to some embodiments of the application;

[0143] FIG. 42 is a flow chart of a method of processing a battery cell, according to some embodiments of the application;

[0144] FIG. 43 is a flow chart of a method of processing a battery cell, according to some embodiments of the application;

[0145] FIG. 44 is a flow chart of a method of processing a battery cell, according to some embodiments of the application;

[0146] Figure 45 is a flow chart of a method of processing a battery cell in accordance with some embodiments of the application;

[0147] Figure 46 is a flow chart of a method of processing a battery cell in accordance with some embodiments of the application;

[0148] Figure 47 is a flow chart of a method of processing a battery cell in accordance with some embodiments of the application;

[0149] Figure 48 is a flow chart of a method of processing a battery cell in accordance with some embodiments of the application;

[0150] Figure 49 is a flow chart of a method of processing a battery cell in accordance with some embodiments of the application;

[0151] Figure 50 is a flow chart of a method of processing a battery cell in accordance with some embodiments of the application;

[0152] Figure 51 is a flow chart of a method of processing a battery cell in accordance with some embodiments of the application;

[0153] Figure 52 is a flow chart of a method of processing a battery cell in accordance with some embodiments of the application;

[0154] Figure 53 is a flow chart of a method of processing a battery cell in accordance with some embodiments of the application;

[0155] Figure 54 is a flow chart of a method of processing a battery cell in accordance with some embodiments of the application;

[0156] Figures 55A-55F are exploded schematic diagrams of processing in accordance with some embodiments of the application.

[0157] 1000; battery 100; controller 200; motor 300; box 101; first box part 1011; second box part 1012; battery cell 102; first direction F1; second direction F2; third direction F3; fifth direction F5; sixth direction F6; shell part 1; shell body 11; first shell wall 111; first groove 1111; lap joint 1112; mounting hole 112; opening 113; second shell wall 114; shell cover 12; accommodating cavity 13; sealing ring 14; pole column part 2; pole column main 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 column part 21a; second pole column part 21b; matching hole 21b1; adapter structure 22; inner end face 220 of adapter structure; surrounding area 2201; flange part 22a; second groove 22b; first adapter ring 221; second adapter ring 222; stop ring part 2221; first insulation frame 224; third adapter ring 223; inner extension part 2231; outer extension part 2232; second insulation frame 225; fourth adapter ring 227; matching ring part 2271; third insulation frame 228; insulation structure 23; sealing structure part 231; shaft side part 231a; first insulation part 232; second insulation part 234; insulation sealing part 24; battery cell part 3; battery cell assembly 31; tab 311; lamination part 312; battery cell main body 32; battery cell group 32A; tab group 33; free end 331; tab part 332; folding part 333; first opening groove 334; shaft cross section 34 of battery cell part; adapter part 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 body structure 357; branch structure 358; branch segment 3581; insulation part 4; through hole 40; insulation film 41; tearing structure 411; insulation support 42; support main body 421; first separation sheet 422; accommodating groove 5; pressure relief part 6; binding part 8. DETAILED DESCRIPTION

[0158] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the protection scope of the present application.

[0159] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the specification herein is for describing particular embodiments only and is not intended to be limiting of the application. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure and will not be interpreted in an overly literal sense unless expressly so defined herein.

[0160] Reference throughout this application to "example" means that a particular feature, structure, or characteristic described in connection with the example can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of other embodiments.

[0161] In the description of the application, it is necessary to note that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "attachment" should be understood in a broad sense, for example, can be directly connected, can also be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0162] The term "and / or" in the application is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the application generally represents that the front and rear associated objects have an "or" relationship.

[0163] In the embodiments of the application, the same reference signs represent the same parts, and for the sake of brevity, the detailed description of the same parts is omitted in different embodiments. It should be understood that the thickness, length and width of various components in the embodiments of the application shown in the drawings, as well as the overall thickness, length and width of the integrated device, are only exemplary and should not constitute any limitation on the application.

[0164] "Multiple" appearing in the application means more than two (including two).

[0165] In the present application, the battery cell can include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium lithium-ion battery, a sodium-ion battery, a magnesium-ion battery, or a solid-state battery, etc. The embodiments of the present application are not limited thereto. The battery cell can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc. The embodiments of the present application are not limited thereto. The battery cell is generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells, and soft-pack battery cells, etc. The embodiments of the present application are not limited thereto.

[0166] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application can be a battery module or a battery pack, etc. The battery module generally includes a plurality of battery cells. The battery generally includes a box for packaging one or more battery cells, or one or more battery modules, which can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cell; of course, the battery can also not include a box.

[0167] Exemplarily, the battery cell generally can include a shell part, an electrode core part, and an electrolyte (in a solid-state battery, it can be a solid-state electrolyte layer located between the positive and negative electrode sheets), the shell is used to accommodate the electrode core part and the electrolyte, and the shell is provided with at least one positive pole and at least one negative pole. The electrode core part includes one or more electrode core assemblies, and the electrode core assembly is formed by laminating or winding the positive electrode sheet, the negative electrode sheet, and the separator film (which can be omitted in a solid-state battery). The material of the shell part is not limited, for example, including but not limited to aluminum shell, steel shell, aluminum plastic film, plastic, or other electrolyte corrosion-resistant materials.

[0168] The positive electrode sheet 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, and the positive current collector without the positive active material layer serves as a positive tab sheet, and a plurality of positive tab sheets are laminated together and electrically connected to the positive pole. Exemplarily, the plurality of positive tab sheets laminated together can be directly welded to the positive pole to form an electrical connection; or the electrode core assembly can further include a positive adapter, the plurality of positive tab sheets laminated together are welded to one end of the positive adapter, and the other end of the positive adapter is welded to the positive pole, so that the positive tab sheet and the positive pole form an electrical connection.

[0169] The negative electrode tab generally can include a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer is coated on the negative electrode current collector directly or indirectly, the negative electrode current collector without the negative electrode active material layer is protruded from the negative electrode current collector with the negative electrode active material layer, the negative electrode current collector without the negative electrode active material layer is used as a negative electrode tab, and a plurality of negative electrode tabs are stacked together and electrically connected with the negative electrode post. Exemplarily, the plurality of negative electrode tabs stacked together can be directly welded to the negative electrode post to form the electrical connection; or the battery cell assembly can further include a negative electrode adapter, the plurality of negative electrode tabs stacked together 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 are electrically connected with the negative electrode post. The material of the separator is not limited, for example, it can be polypropylene or polyethylene, etc.

[0170] The pressure relief component on the battery cell mentioned in the present application is used to release the gas inside the battery cell, etc., to reduce the internal pressure of the battery cell and prevent the battery cell from exploding due to the rapid internal pressure of the battery cell when the internal pressure of the battery cell is too high (for example, due to overcharging, etc.).

[0171] In recent years, new energy vehicles have made a great leap in development. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable important role.

[0172] In the related art, the power battery includes a battery cell, and the tab of the battery cell needs to be electrically connected with the post, so the arrangement of the tab usually affects the reliability of the battery cell, which needs to be further improved.

[0173] Based on the above considerations, a battery cell is provided, which includes a shell component, a post component and a cell component. The shell component has a receiving cavity and includes a first shell wall participating in defining the receiving cavity. The post component is installed on the first shell wall and includes a post main body. The cell component includes at least one cell group, and each cell group includes n cell main bodies. The n cell main bodies are arranged in the receiving cavity and are sequentially arranged along a first direction. The end of each cell main body is connected with a tab group. All tab groups of the cell group extend towards the middle position of the cell group in the first direction and are connected to form a tab part. The tab part is electrically connected with the post main body. n is a positive integer and n≥1.

[0174] In the technical solution, all the tab groups of the battery cell group extend towards the middle position of the battery cell group in the first direction and are connected to form one tab part. On the one hand, the number of the tab part is one, and compared with the batchwise and multiple gathering, the one-time gathering process is simple and the cost is lower. Moreover, compared with the batchwise and multiple gathering, the gathering process does not need to consider the number of the battery cell body. No matter how many the number of the battery cell body is, the battery cell body can be directly gathered at one time. On the other hand, the central gathering forms one tab part, which can shorten the average length of the multiple tab pieces in the tab group compared with the offset gathering, thereby improving the redundancy of the tab group, reducing the risk of the tab group being inserted into the battery cell body or the root position of the tab group connected to the battery cell body, and improving the problems of the tab piece of the tab group, such as wrinkling, bending and breaking, and improving the reliability of the battery monomer.

[0175] The technical solutions described in the embodiments of the present application are applicable to battery monomers, batteries containing battery monomers, and electric devices using batteries.

[0176] The electric device can be, but is not limited to, a vehicle, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, etc. The electric toy can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric plane toys, etc. The spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc. The electric tool includes metal cutting electric tools, grinding electric tools, assembly electric tools, and electric tools for railways, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planes, etc.

[0177] The following embodiments are described for convenience with the electric device 1000 as a vehicle.

[0178] Please refer to FIG. 1, which is a structural schematic diagram of the electric device 1000 as a vehicle provided by some embodiments of the present application. The vehicle can be a fuel automobile, a gas automobile, or a new energy automobile, which can be a pure electric automobile, a hybrid electric automobile, or a range extended automobile, etc. The vehicle is provided with a battery 100, which can be arranged at the bottom, the head, or the tail of the vehicle. The battery 100 can be used for power supply of the vehicle, for example, the battery 100 can be used as an operating power source of the vehicle. The vehicle can also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to supply power to the motor 300, for example, to meet the working power demand of the vehicle during starting, navigation, and driving. In some embodiments of the present application, the battery 100 can not only be used as an operating power source of the vehicle, but also be used as a driving power source of the vehicle, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle.

[0179] Please refer to FIG. 2, which is an exploded view of the battery 100 according to some embodiments of the present application. The battery 100 includes a box 101 and a plurality of battery cells 102, which are accommodated in the box 101. The box 101 is used to provide an assembly space for the battery cells 102, and the box 101 can have various structures. In some embodiments, the box 101 can include a first box part 1011 and a second box part 1012, the first box part 1011 and the second box part 1012 are overlapped with each other, and the first box part 1011 and the second box part 1012 together define an accommodation cavity for accommodating the battery cells 102. The connection position of the first box part 1011 and the second box part 1012 can also be provided with a sealing member to achieve a sealed connection of the first box part 1011 and the second box part 1012.

[0180] For example, referring to FIG. 2, the first box part 1011 and the second box part 1012 can each be a hollow structure with one open side, and the open side of the first box part 1011 is overlapped with the open side of the second box part 1012 to form the box 101 with an accommodation space. For another example, the second box part 1012 can be a hollow structure with one open end, and the first box part 1011 can be a plate-shaped structure, and the first box part 1011 is overlapped with the open end of the second box part 1012 to make the first box part 1011 and the second box part 1012 together define an accommodation cavity. Of course, the box 101 formed by the first box part 1011 and the second box part 1012 can have various shapes, such as a cylinder or a cuboid.

[0181] In the battery 100, the battery cells 102 can be one or multiple; when the battery cells 102 are multiple, the multiple battery cells 102 can be connected in series, in parallel, or in a mixed manner, and the mixed manner means that the multiple battery cells 102 are connected in series and in parallel. The multiple battery cells 102 can be directly connected in series, in parallel, or in a mixed manner, and then the whole of the multiple battery cells 102 is accommodated in the box 101; or the battery 100 can also be that the multiple battery cells 102 are first connected in series, in parallel, or in a mixed manner to form a battery module, and then multiple battery modules are connected in series, in parallel, or in a mixed manner to form a whole, and the whole is accommodated in the box 101. The battery 100 can also include other structures, for example, the battery 100 can also include a current combing component for realizing the electrical connection between the multiple battery cells 102.

[0182] Please refer to FIG. 3-5, the battery monomer 102 is a cuboid, the thickness direction of the battery monomer 102 is the first direction F1, the height direction of the battery monomer 102 is the second direction F2, and the width direction of the battery monomer 102 is the third direction F3, and the first direction F1, the second direction F2 and the third direction F3 are perpendicular to each other. But not limited to this, in other embodiments of the application, the battery monomer 102 can also be a polygonal prism, a flat body or other shapes, etc. The fourth direction F4 described below can be parallel to the first direction, and the fifth direction F5 can be parallel to the second direction.

[0183] Exemplarily, the battery monomer 102 is a blade battery, and the core component 3 is configured as a laminated structure, at this time, the plurality of pole pieces of the core component 3 can be arranged in sequence along the first direction.

[0184] Please refer to FIG. 6-8, FIG. 6 is a cross-sectional view of the battery monomer 102 provided by some embodiments of the application, FIG. 7 is a partial schematic view of the battery monomer 102 shown in FIG. 6, and FIG. 8 is a partial cross-sectional view of the battery monomer 102 provided by some embodiments of the application. In the embodiments of the application, the battery monomer 102 includes a shell component 1, a pole component 2 and a core component 3.

[0185] The pole component 2 is installed on the shell component 1. The shell component 1 has a containing cavity 13 therein, and the shell component 1 includes a first shell wall 111 participating in defining the containing cavity 13, and the pole component 2 is installed on the first shell wall 111. Exemplarily, the first shell wall 111 has a mounting hole 112 thereon, and the pole component 2 is arranged at the mounting hole. Wherein, the "pole component 2 installed on the first shell wall 111" means that the pole component 2 has an assembly connection relationship with the first shell wall 111, which can be welded or riveted, etc. Thus, the shell component 1 and the pole component 2 are respectively separate parts, and the two are assembled and connected, so that the shell component 1 and the pole component 2 can be processed separately, which is convenient for processing of the two, and is also conducive to processing and manufacturing of the battery monomer 102.

[0186] The core component 3 includes a core main body 32, and the core main body 32 is arranged in the containing cavity 13, and the end of the core main body 32 is connected with a tab group 33, and the tab group 33 is electrically connected with the pole main body 21. Exemplarily, the core component 3 includes one or more core assemblies 31, each core assembly 31 includes the core main body 32 and the tab group 33, the part of the current collector coated with the active material layer in the core assembly 31 constitutes the core main body 32, and the part not coated with the active material layer constitutes the tab group 33, and the tab group 33 corresponds to the core main body 32 one by one, and the tab group 33 can include multiple layers of tab pieces 311.

[0187] The cell component 3 includes at least one cell group 32A, each cell group 32A includes n cell bodies 32, the n cell bodies 32 are arranged in the accommodating cavity 13, and the n cell bodies 32 of the cell group 32A are sequentially arranged along the first direction, the stacking direction of the n cell bodies 32 is the first direction, the end of each cell body 32 is connected with a tab group 33, all the tab groups 33 of the cell group 32A extend towards the middle position of the cell group 32A in the first direction and are connected to form a tab part 332, the tab part 332 is electrically connected with the pole body 21, and n≥1 and n is a positive integer. It can be seen that the cell component 3 includes at least one cell body 32, and especially when the cell component 3 includes a plurality of cell bodies 32, the voltage and capacity of the battery monomer 102 can be improved.

[0188] It can be understood that the plurality of tab pieces 311 of all the tab groups 33 of the cell group 32A not only converge and are connected into an integrated structure when forming the tab part 332, but also can be connected into an integrated sheet structure by welding (such as ultrasonic welding) to form the tab part 332, and the plurality of tab pieces 311 of all the tab groups 33 of the cell group 32A can be converged and connected to form the tab part 332 by conductive adhesive bonding and the like, which is not described herein.

[0189] For the battery monomer 102, the cell group 32A can have one or more groups, for a single cell group 32A, the middle position of the cell group 32A in the first direction can correspond to the folding area R, the center of the folding area R can be the center of the cell group 32A in the first direction, all the tab groups 33 of the cell group 32A extend to the folding area R, and the above-mentioned all the tab groups 33 are connected to form a tab part 332 at the free end 331, at least part of the tab part 332 is located in the folding area R in the first direction. In addition, when the cell component 3 includes a plurality of cell groups 32A, the number of cell bodies 32 of the plurality of cell groups 32A can be equal or different; no matter whether the cell group 32A is one group or multiple groups, the number of cell bodies 32 of each cell group 32A can be odd or even.

[0190] The tab part 332 can be directly electrically connected with the pole body 21, or the tab part 332 is indirectly electrically connected with the pole body 21 through other adapters (such as the adapter 35 described below).

[0191] In combination with FIG. 11, the end of the cell body 32 is connected with a conductive part 4, the conductive part 4 is electrically connected with the pole body 21, the conductive part 4 includes the tab group 33 and the adapter 35, and the tab group 33 is electrically connected with the pole body 21 through the adapter 35.

[0192] For example, in combination with FIG. 9, when the cell body 32 of the cell component 3 is one, that is, n = 1, the length L of the conductive part 4 is calculated as follows:

[0193] When the cell body 32 of the cell component 3 is multiple, that is, n ≥ 2, the cell group 32A is one or more groups, for a single cell group 32A, the length L' of the conductive part 4 corresponding to the cell group 32A is calculated as follows:

[0194] Wherein, n is the number of the cell body 32 (which can be understood as a bare cell) of the cell group 32A, a is the offset of the gathering connection position of the multiple tab pieces 331 of the cell group 32A and the center position of the cell group 32A in the first direction, h1 is the distance between the end face of the cell body 32 facing the first shell wall 111 and the first shell wall 111 (usually the thickness of the insulating support 42 between the cell body 32 and the first shell wall 111), δ is the thickness of a single cell body 32 in the first direction, h2 is the thickness of the shell component 1, the pole body 21 has a welding surface (for example, the inner end face 211 described later is configured as a welding surface), and λ is the size of the welding surface in the first direction.

[0195] Therefore, whether the cell group 32A includes one cell body 32 or multiple cell bodies 32, for a single cell group 32A, the embodiment of the present application extends all the tab groups 33 of the cell group 32A to the position close to the center of the cell group 32A in the first direction and connects them to form a tab part 332, so that the position O of the tab part 332 adjacent to the cell body 32 in the extension direction of the conductive part 4 can be understood as the gathering connection position. Since the tab part 332 is formed by extending all the tab groups 33 to the position close to the center of the cell group 32A in the first direction and connecting them, the offset a between the gathering connection position and the center of the cell group 32A in the first direction can be reduced, that is, the offset a in the above formula can be reduced, which is beneficial to make the offset a tend to 0 or be very small. Since the larger the offset a is, the longer the length of the conductive part 4 required is, and the longer the length of the tab group 33 and / or the adapter 35 is, the above setting of the embodiment of the present application can reduce the length of the conductive part 4 for both the scheme that the tab group 33 is directly connected to the pole body 21 and the scheme that the tab group 33 is indirectly connected to the pole body 21 through the adapter 35. For the case that the tab group 33 is directly connected to the pole body 21, the length of the tab group 33 can be directly reduced. For the case that the tab group 33 is indirectly connected to the pole body 21 through the adapter 35, the length of the tab group 33 can also be reduced. In addition, due to the setting of the adapter 35, the length of the tab group 33 can be further reduced.

[0196] In the technical solution, all the tab groups 33 of the battery cell group 32A extend towards the middle position of the battery cell group 32A in the first direction and are connected to form a tab part 332. On the one hand, the number of the tab part 332 is one, and compared with the batchwise multiple gathering, the one-time gathering process is simple and the cost is lower. Moreover, compared with the batchwise multiple gathering, the gathering process does not need to consider the number of the battery cell body 32. No matter how many the battery cell body 32 is, it can be directly gathered at one time. On the other hand, the central gathering forms a tab part 332, which can shorten the average length of the multiple tab pieces 331 in the tab group 33 compared with the offset gathering, thereby improving the redundancy of the tab group 33, reducing the risk of the tab group 33 being inserted into the battery cell body 32 or the root position of the tab group 33 connected to the battery cell body 32, and improving the problems such as wrinkling, bending and breaking of the tab pieces 331 of the tab group 33, thereby improving the reliability of the battery monomer 102.

[0197] Please refer to FIG. 9. In some embodiments, in the first direction, the midpoint of the middle position is the midpoint of the battery cell group 32A in the first direction. The size of the middle position is less than or equal to 1 / 2 of the size of one battery cell body 32. The size of the gathering area R in the second direction is less than or equal to 1 / 2 of the size of one battery cell body 32 in the second direction. Thus, the middle position is not an absolute midpoint. The middle position is a small range of area formed around the midpoint. This setting can take into account different assembly requirements and use requirements on the premise of shortening the length of the tab group 33, thereby reducing the assembly requirements and improving the applicability and practicality of the battery monomer 102.

[0198] For example, the size of the gathering area R in the second direction is 1 / 5, 1 / 4, 1 / 3 or 1 / 2 of the size of one battery cell body 32 in the second direction. Of course, the gathering area R can also be appropriately enlarged to 2 / 3 of the size of one battery cell body 32, etc.

[0199] Please refer to FIGS. 7-13. In some embodiments, the battery monomer 102 includes m battery cell groups 32A, m≥1 and m is a positive integer. Each battery cell group 32A corresponds to one tab part 332. For example, in combination with FIG. 8, if the tab part 332 is directly connected to the pole body 21, the multiple tab groups 332 of the multiple battery cell groups 32A are connected to form an integrated part to be connected to the pole body 21. The one end of the integrated part adjacent to the battery cell body 32 in the extension direction of the tab part 332 is the position O. In combination with FIGS. 7, 9-13, if the tab part 332 is indirectly connected to the pole body 21 through the adapter 35, the tab parts 332 of all the battery cell groups 32A can be connected to the adapter 35 respectively. The one end of each tab part 332 adjacent to the battery cell body 32 in the extension direction of the tab part 332 is the position O. Each position O is located in the gathering area R of the corresponding battery cell group 32A.

[0200] For example, m = 1 and n = 1, at this time the battery monomer 102 includes one core body 32; for another example, in combination with FIGS. 7-13, at least one of m and n is greater than or equal to 2, m = 1 and n ≥ 2, or m ≥ 2 and n = 1, or m ≥ 2 and n ≥ 2, at this time the battery monomer 102 includes a plurality of core bodies 32.

[0201] In the above technical solution, by setting the number of core groups 32A and the number of core bodies 32 in the core group 32A, the structural flexibility design and structural diversification design of the battery monomer 102 are facilitated, and the applicability and practicality of the battery monomer 102 are improved.

[0202] Please refer to FIGS. 7-13, in some embodiments, the number of core bodies 32 of at least one core group 32A is odd; and / or, the number of core bodies 32 of at least one core group 32A is even.

[0203] For example, when the core component 3 includes a core group 32A, the number of core bodies 32 of the core group 32A can be odd or even; when the core component 3 includes a plurality of core groups 32A, the number of core bodies 32 of all core groups 32A can be odd, or the number of core bodies 32 of all core groups 32A can be even, or the number of core bodies 32 of at least one core group 32A is odd and the number of core bodies 32 of at least one core group 32A is even.

[0204] For example, for a single core group 32A, the number of core bodies 32 can be 1, 2, 3, 4, 5, 6, 7, 8, etc.; of course, the number of core bodies 32 of a single core group 32A can also be 9 or more. The number of core groups 32A can be 1, 2, 3, 4, etc.; of course, the number of core groups 32A can also be 5 or more.

[0205] In the above technical solution, generally speaking, when the number of core bodies 32 in the core group 32A exceeds two, if the number of core bodies 32 is odd, it is not possible to achieve the folding of the two sides of the plurality of core bodies 32, and therefore, by means of one-time folding in the middle, one-time folding of the odd number of core bodies 32 can be achieved. Similarly, this also applies to the even number of core bodies 32 of the core group 32A. Therefore, by such arrangement, the connection diversification arrangement of the core bodies 32 in the battery monomer 102 can be facilitated, the structural flexibility design and structural diversification design of the battery monomer can be facilitated, and the applicability and practicality of the battery monomer can be improved.

[0206] The number of the cell bodies 32 of the at least one group of cell groups 32A is odd, and the number of the cell bodies 32 of the at least one group of cell groups 32A is even, facilitating diversified arrangement of the connection of the cell bodies 32 in the battery monomer 102, facilitating flexible design and diversified design of the structure of the battery monomer 102, and being beneficial to improving the applicability and practicability of the battery monomer 102.

[0207] Please refer to FIGS. 12 and 13. In some embodiments, the battery monomer 102 comprises m groups of cell groups 32A arranged in sequence along the first direction, m≥2 and m is a positive integer, and the number of the cell bodies 32 of the multiple groups of cell groups 32A is equal or unequal. In this way, the design of the cell group 32A is flexible, facilitating improvement of the applicability and practicability of the battery monomer 102.

[0208] For example, in combination with FIG. 11, the cell group 32A is one group, and the cell group 32A comprises two cell bodies 32 arranged along the first direction; for another example, the cell group 32A is one group, and the cell group 32A comprises three cell bodies 32 arranged along the first direction; for another example, in combination with FIG. 12, the cell group 32A is one group, and the cell group 32A comprises four cell bodies 32 arranged along the first direction; for another example, in combination with FIG. 13, the cell group 32A is two groups, and each group of cell groups 32A comprises four cell bodies 32 arranged along the first direction; for another example, the cell group 32A is two groups, one group comprises three cell bodies 32, and the other group comprises five cell bodies 32; for another example, the cell group 32A is two groups, one group comprises one cell body 32, and the other group comprises two cell bodies 32.

[0209] Please refer to FIGS. 7, 9-13. In some embodiments, the cell component 3 further comprises a adapter 35, and the tab part 332 is electrically connected with the pole body 21 through the adapter 35. In this way, the length of the tab part 33 can be shortened by indirectly connecting the tab part 33 with the pole body 21 through the adapter 35, and the problems such as wrinkling, bending and breaking of the tab sheet 311 can be improved, and the connection difficulty of the adapter 35 with the pole body 21 can be reduced and the connection convenience of the adapter 35 with the pole body 21 can be improved by flexibly designing the shape and material of the adapter 35.

[0210] Exemplarily, the battery 100 further comprises a busbar component located outside the battery cell 102, the busbar component is connected with the pole body 21 to form an electrical conduction, so as to realize the electrical connection of the plurality of battery cells 102 through the busbar component. In this way, by indirectly connecting the tab group 33 and the pole body 21 through the adapter 35 to form an electrical conduction, the length of the tab group 33 can be shortened, the redundancy of the tab group 33 can be improved, and the problems such as wrinkling, bending and breaking of the tab sheet 311 of the tab group 33 can be improved. At the same time, due to the shorter length of the tab group 33 and the certain restriction of the adapter 35 on the tab group 33 due to the connection of the adapter 35 with the tab group 33, the risk of short circuit caused by the reverse insertion of the tab group 33 into the cell body 32 can be reduced, and the connection difficulty of the adapter 35 with the pole body 21 and the connection difficulty of the adapter 35 with the tab group 33 can be reduced by flexibly designing the shape and material of the adapter 35, which is conducive to improving the assembly convenience of the battery cell 102.

[0211] In addition, the perforation 40 operation of the adapter 35, the connection operation of the adapter 35 with the pole component 2 (which can also be absent), and the connection operation of the pole component 2 with the shell component 1, are not easy to cause the connection position of the cell body 32 and the tab group 33 to crack, thereby improving the reliability of the battery cell 102

[0212] The connection mode of the adapter 35 with the tab group 33 is not specifically limited, and the connection mode of the adapter 35 with the pole body 21 is also not specifically limited. For example, the adapter 35 and the pole body 21 can be connected in a mode including but not limited to ultrasonic welding, ultrasonic pre-Korean combined with laser welding, resistance welding, pressure fusion welding, brazing, riveting, punching, cementing and the like.

[0213] Please refer to FIG. 10, in some embodiments, the adapter 35 comprises a main body structure 357 and a plurality of branch structures 358, the main body structure 357 is connected with the pole body 21, each branch structure 358 is connected at an end of the main body structure 357 away from the pole body 21, and each branch structure 358 comprises at least one branch segment 3581, so that the adapter 35 is configured as a fractal tree structure, and each last branch segment 3581 of the branch structure 358 supports one tab portion 332.

[0214] Exemplarily, each branch structure 358 comprises first-stage branch segments 3581 to p-stage branch segments 3581 arranged in sequence from the part of the adapter 35 connected to the pole body 21 to the part of the adapter 35 connected to the lug group 33, each p-stage branch segment 3581 supports one lug part 332, the main structure 357 is connected to a plurality of first-stage branch segments 3581, each upper-stage branch segment 3581 is connected to a plurality of lower-stage branch segments 3581, for example, each first-stage branch segment 3581 is connected to a plurality of second-stage branch segments 3581, each (q-1)-stage branch segment 3581 is connected to a plurality of q-stage branch segments 3581, p and q are positive integers respectively. For example, in combination with FIG. 10, each branch structure 358 comprises one first-stage branch segment 3581, and the first-stage branch segment 3581 supports the lug part 332; for another example, each branch structure 358 comprises two first-stage branch segments 3581, i.e., a first-stage branch segment 3581 and a second-stage branch segment 3581, each first-stage branch segment 3581 is connected to a plurality of second-stage branch segments 3581, and the second-stage branch segment 3581 of each branch structure 358 supports the lug part 332.

[0215] In the technical solution, the adapter 35 is configured as a fractal tree structure, so that the adapter 35 can realize electrical connection of all the cell bodies 32 and the pole body 21, and the adapter 35 can be connected to a larger number of cell bodies 32, and the adapter 35 occupies a relatively small space.

[0216] Exemplarily, the adapter 35 is configured as a fractal tree structure, the number of the cell bodies 32 of the battery monomer 102 can be two, three, four, five, six, seven or eight, and the thickness of the cell component 3 can be expanded to a maximum of 120 mm.

[0217] Please refer to FIG. 10. In some embodiments, the adapter 35 comprises a first connecting part 351, a bending part 353 and a second connecting part 352, the first connecting part 351 and the second connecting part 352 are opposite, the bending part 353 is bent and connected between the first connecting part 351 and the second connecting part 352, and at least part of the second connecting part 352 is configured as a plurality of branch structures 358.

[0218] In the technical solution, the bending part 353 is bent and connected between the first connecting part 351 and the second connecting part 352, and at least part of the second connecting part 352 is configured as a plurality of branch structures 358, so that all the lug groups 33 are electrically connected to the same pole body 21, the structure of the adapter 35 is simplified, the bent adapter 35 can play a buffering and supporting role, which is conducive to reducing the risk of the cell component 3 impacting the shell component 1 and improving the reliability of the battery monomer 102.

[0219] In the technical solution, if the second connecting portion 352 is configured as a plurality of branch structures 358, the demarcation line between the main body structure 357 and the branch structure 358, or the connecting position of the main body structure 357 and the branch structure 358, is located on the second connecting portion 352; if the second connecting portion 352 is configured as a plurality of branch structures 358, the demarcation line between the main body structure 357 and the branch structure 358 can be located at the connecting position of the second connecting portion 352 and the bent portion 353.

[0220] Exemplarily, when the adapter 35 supports the free end of the tab group 33, the adapter 35 can prevent the free end of the tab group 33 from being inserted into the battery cell main body 21 in a direction close to the battery cell main body 21, thereby reducing the risk of short circuit; at this time, if the adapter 35 includes the first connecting portion 351, the bent portion 353, and the second connecting portion 352, the bent adapter 35 can play a buffering support role while reliably supporting the free end 331 of the tab group 33, and the second connecting portion 352 supports all the tab groups 33 to prevent the free end 331 of all the tab groups 33 from being inserted into the battery cell main body 21, thereby improving the reliability of the battery monomer 102.

[0221] Referring to FIG. 10, in some embodiments, the connecting position of the main body structure 357 and the branch structure 358 is located at the middle position of all the m tab groups 32A in the first direction, which can correspond to a region R'. In the first direction, the center of the region R' can be the center of all the tab groups 32A, and in the first direction, the connecting position of the main body structure 357 and the branch structure 358 is located in the region R'.

[0222] In the technical solution, by setting the connecting position of the main body structure 357 and the branch structure 358 at the middle position of all the tab groups 32A in the first direction, the length of the branch structure 358 can be shortened under the premise that the branch structure 358 reliably supports the tab group 33, which is conducive to reducing the occupied space of the adapter 35.

[0223] Optionally, the size of the region R' in the first direction is less than or equal to 1 / 2 of the size of one battery cell main body 32 in the first direction; but not limited thereto.

[0224] Referring to FIG. 9, in some embodiments, the tab group 33 is connected to the tab main body 21 through the adapter 35, the extension length of the adapter 35 is L1, L1 > b + λ / 2, b is the extension length of the part of the adapter 35 connected to the tab portion 332, and λ is the size of the welding surface in the first direction.

[0225] In the technical solution, the extension length L1 of the adapter 35 is greater than a+λ / 2, so that the adapter 35 and the tab part 332 have a large connection length, and the adapter 35 and the pole body 21 have a large connection length, thereby realizing reliable electrical connection between the tab group 33 and the pole body 21.

[0226] Referring to FIG. 9, in some embodiments, L1≥b+λ / 2+W / 2, and W is the size of the pole part 2 in the first direction.

[0227] In the technical solution, the extension length L1 of the adapter 35 is greater than b+λ / 2+W / 2, so that the adapter 35 and the tab part 332 have a large connection length, and the adapter 35 and the pole body 21 have a large connection length, thereby improving the connection reliability of the tab group 33 and the pole body 21.

[0228] For example, in combination with FIG. 9, L1=b+λ / 2+W / 2=b+c+π*R+X, which is convenient for bending the adapter 35, c can be any value greater than 0, and X is the length of the part of the bending part 353 facing the pole part 2.

[0229] Referring to FIGS. 7 and 8, in some embodiments, all tab groups 33 of the cell group 32A, or the conductive part 4 formed after the tab part 332 is connected with the adapter 35, is bent to form an open slot P. It can be seen that, for the scheme without the adapter 35, the open slot P is formed on the tab group 33, and for the scheme with the adapter 35, the open slot P is formed on the tab group 33 and / or the adapter 35; the open slot P can play a role of buffering and supporting, which is conducive to reducing the risk of the cell part 3 impacting the shell part 1 and improving the reliability of the battery monomer 102.

[0230] Referring to FIGS. 7 and 8, in some embodiments, all tab groups 33 of the cell group 32A, or the conductive part 4 formed after the tab part 332 is connected with the adapter 35, is bent to form multiple open slots P, the multiple open slots P are sequentially arranged from the cell body 21 to the direction of the pole part 1, and the openings of adjacent two open slots P are arranged at an included angle. It can be seen that, for the scheme without the adapter 35, the open slot is formed on the tab group 33, and at least part of the tab group 33 is in a snake shape at this time, and for the scheme with the adapter 35, the open slot is formed on the tab group 33 and / or the adapter 35; the above arrangement of the open slot P can play a role of buffering and supporting, which is conducive to reducing the risk of the cell part 3 impacting the shell part 1 and improving the reliability of the battery monomer 102.

[0231] In addition, the tab group 33 or the conductive part in the snake shape is not irregularly extended, so that the mutual interference and rubbing between the tab pieces 311 and the risk of the tab pieces 311 being inserted into the active cell body 32 can be improved, and the reliability of the battery monomer 102 is further improved.

[0232] Exemplarily, in combination with FIG. 7, the tab group 33 is bent to form a first open slot 334, at least part of the tab group 33 is formed in a C shape, the free end 331 defines at least part of one side slot wall of the first open slot 334 close to the pole body 21, the adapter 35 extends into the first open slot 334, and the adapter 35 abuts against the free end 331.

[0233] In the above technical solution, by setting the adapter 35 to extend into the first open slot 334 formed by bending the tab group 33 and abut against the free end 331, the support reliability of the adapter 35 to the free end 331 can be improved, at the same time, the bent tab group 33 can play a buffering role, when the battery monomer 102 is used in a vibrating environment, the impact of the cell body 32 on the first shell wall 111 can be reduced, the function of protecting the cell component 3 is played, and the reliability of the battery monomer 102 is improved.

[0234] As can be seen, in the embodiments of the present application, the tab group 33 can be bent to form one open slot P or multiple open slots P. When the tab group 33 is bent to form one open slot P, the open slot P is the first open slot 334; when the tab group 33 is bent to form multiple open slots P, the multiple open slots P include the first open slot 334 and a third open slot, at this time, the opening directions of the adjacent two open slots P can be arranged at an angle, for example, the opening directions of the adjacent two open slots P are at an obtuse angle, or the opening directions of the adjacent two open slots P are at an angle of 180°, etc.

[0235] Please refer to FIG. 7, in some embodiments of the present application, the adapter 35 is bent to form a second open slot 355, the second open slot 355 is adjacent to the first open slot 334, and the second open slot 355 is located on the side of the first open slot 334 facing the pole body 21, the opening directions of the second open slot 355 and the first open slot 334 are arranged at an angle.

[0236] As can be seen, in the direction from the pole body 21 to the cell body 32, the first open slot 334 and the second open slot 355 are arranged adjacent to each other (for example, as shown in FIG. 7, the first open slot 334 and the second open slot 355 are arranged adjacent to each other in up and down directions, the opening of the first open slot is generally to the left, and the opening of the second open slot is generally to the right).

[0237] Thus, the conductive part 4 formed by the lug group 33 and the adapter 35 can present a reciprocating bending serpentine shape, and the conductive part 4 can play a buffering role, which can reduce the impact of the cell body 32 on the first shell wall 111 when the battery monomer 102 is used in a vibrating environment, thereby playing a role in protecting the cell component 3 and improving the reliability of the battery monomer 102. Moreover, since the conductive part 4 is not irregularly extended, the mutual interference and rubbing between the lug pieces 311 and the risk of the lug pieces 311 being inserted into the live cell body 32 can be improved, thereby further improving the reliability of the battery monomer 102.

[0238] Exemplarily, referring again to FIG. 7, the lug group 33 includes a lug part 332 and a folding part 333 connected by bending, and the lug part 332 and the folding part 333 form opposite two side slot walls of a first open slot 334, respectively; the adapter 35 includes a first connecting part 351 and a second connecting part 352 connected by bending, and the first connecting part 351 and the second connecting part 352 form opposite two side slot walls of a second open slot 355, respectively. Thus, the conductive part 4 can present a reciprocating bending S shape, thereby shortening the length of the conductive part 4, simplifying the structure of the conductive part 4, and facilitating the processing of the conductive part 4.

[0239] Referring to FIGS. 7 and 14, in some embodiments, one end of the adapter 35 away from the pole body 21 has a clamping structure 356, the clamping structure 356 includes two oppositely arranged clamping parts 3561, the lug group 332 is clamped between the two clamping parts 3561, and the lug part 332 is connected with each clamping part 3561, and then the two clamping parts 3561 are arranged on both sides of the thickness of the lug part 332.

[0240] For example, one end of the adapter 35 with the clamping structure 356 can be substantially Y-shaped, and two forks of the Y-shaped structure can form two clamping parts 3561, respectively, the lug part 332 is clamped between the two forks, and the lug part 332 is electrically connected with each fork.

[0241] In the above technical solution, by clamping the lug part 332 between the two clamping parts 3561, the two clamping parts 3561 can limit the lug part 332, which is conducive to improving the connection reliability of the plurality of lug pieces 311 of the lug group 33 on the lug part 332 and improving the connection reliability of the lug group 33 and the adapter 35; moreover, one clamping part 3561 adjacent to the cell body 32 among the two clamping parts 3561 can conveniently support the lug part 332 of the lug group 33, and the lug part 332 of the lug group 33 is supported on the side away from the pole body 21, so as to prevent the lug part 332 of the lug group 33 from moving toward the cell body 32 and reduce the risk of reverse insertion.

[0242] In addition, when the lug portion 332 is fixed (e.g., welded) with each clamping portion 3561, the lug portion 332 can be first fitted between the two clamping portions 3561, and then pressure is applied to the sides of the two clamping portions 3561 facing away from each other to achieve connection, and the two clamping portions 3561 can separate the lug portion 332 from the device applying pressure, so as to protect the lug portion 332 of the lug group 33, and the device applying pressure does not come into contact with the lug portion 332 of the lug group 33, so as to reduce the risk of cracking of the lug tab 311 of the lug group 33 due to thin thickness and the like when connected, and facilitate improvement of the welding quality between the lug group 33 and the adapter 35, and improvement of the connection reliability of the lug group 33 and the adapter 35. Especially when the thickness of the clamping portion 3561 is greater than the thickness of a single lug tab 311, the clamping portion 3561 can effectively protect the lug tab 311 and reduce the risk of cracking of the lug tab 311 when connected.

[0243] In some examples, for the structure in which the lug portion 332 of the lug group 33 is clamped between the two clamping portions 3561: during processing of the battery cell 102, the lug portion 332 is located at the free end 331 of the lug group 33, and the free end 331 of the lug group 33 can first form the lug portion 332, and then at least part of the lug portion 332 is arranged between the two clamping portions 3561, and the lug portion 332 is connected with the two clamping portions 3561. In short, the plurality of lug tabs 311 of the lug group 33 are pre-connected (e.g., pre-welded) at the free end 331 to form the lug portion 332, and then the lug portion 332 is connected with the clamping structure 356; or the free end 331 of the lug group 33 can first be gathered to form the laminated portion 312, at least part of the laminated portion 312 is arranged between the two clamping portions 3561, and the laminated portion 312 is connected with the two clamping portions 3561. It can be seen that the connection of the plurality of lug tabs 311 of the laminated portion 312 is realized at the same time as the connection of the laminated portion 312 with the two clamping portions 3561, so that the free end 331 of the lug group 33 forms the lug portion 332 at the same time. In short, the plurality of lug tabs 311 of the lug group 33 are only gathered at the free end 331 to form the laminated portion 312, and the plurality of lug tabs 311 of the laminated portion 312 are connected to form the lug portion 332 at the same time as the laminated portion 312 is connected with the clamping structure 356. This mode can save the pre-connection process of the plurality of lug tabs 311 at the free end 331. Wherein, the plurality of lug tabs 311 of the lug group 33 are only gathered but not connected at the free end 331 to form the laminated portion 312.

[0244] Of course, in other embodiments of the application, the end of the adapter 35 away from the pole body 21 can also be provided with a clamping structure 356, for example, the end of the adapter 35 away from the pole body 21 is formed as a flat plate structure, which can be supported on the end of the pole lug portion 332 of the pole lug group 33 away from the pole body 21, and also can achieve the support of the pole lug portion 332 of the pole lug group 33 by the adapter 35, and achieve the purpose of preventing the pole lug portion 332 of the pole lug group 33 from moving towards the battery body 32.

[0245] Please refer to FIG. 7, in some embodiments of the 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, and 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 with the pole body 21, and the second connecting portion 352 is connected with the pole lug portion 332.

[0246] Thus, the bent adapter 35 can play a role of buffering support on the premise of achieving reliable support of the free end 331 of the pole lug group 33, which is conducive to reducing the risk of the battery component 3 impacting the shell component 1 and improving the reliability of the battery monomer 102.

[0247] In some examples, in combination with FIG. 7, the adapter 35 is generally C-shaped or U-shaped, the first connecting portion 351 is generally a flat plate structure, and the first connecting portion 351 is laid on the inner end face 211 of the pole body 21, the thickness side surface of the first connecting portion 351 is connected with 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 above-mentioned thickness side surface of the first connecting portion 351, and the first connecting portion 351 can completely fall on the inner end face 211 of the pole body 21, thereby facilitating to improve the connection area of the inner end face 211 of the pole body 21 and the first connecting portion 351 and improve the current passing efficiency. In some other examples, the adapter 35 is generally L-shaped, the first connecting portion 351 is generally a flat plate structure, and the end face of the end of the first connecting portion 351 away from the second connecting portion 352 is connected with the inner end face 211 of the pole body 21.

[0248] Exemplarily, in combination with FIG. 7, at least part of the second connecting portion 352 supports the pole lug portion 332, and thus through the support of the free end 331 of the pole lug group 33 by the second connecting portion 352, the redundancy of the pole lug group 33 can be improved, and the risk of short circuit caused by the pole lug group 33 inserting the battery body 32 upside down can be reduced.

[0249] In some examples, in combination with FIG. 7, the second connecting portion 352 is configured as a clamping structure 356, and the second connecting portion 352 includes two oppositely arranged clamping portions 3561, the thickness of the second connecting portion 352 is the thickness of the clamping structure 356, that 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 the free end 331 is connected with each clamping portion 3561. Of course, in some examples, the second connecting portion 352 can also be configured as a flat plate structure, which is supported on the side of the free end 331 of the tab group 33 away from the pole body 21, so that the free end 331 of the tab group 33 is located between the second connecting portion 352 and the pole body 21.

[0250] Please refer to FIG. 7 and FIG. 14, in some embodiments of the present application, the thickness of the bending 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 extension direction of the central axis of the bending portion 353, the width of the bending portion 353 is less than the width of at least one of the first connecting portion 351 and the second connecting portion 352.

[0251] For example, in combination with FIG. 7 and FIG. 14, the thickness of the bending 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

[0252] 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 is reduced in the form of reducing the thickness and shortening the width of the bending portion 353, so that the first connecting portion 351 and the second connecting portion 352 have a certain rigidity, respectively, to realize reliable connection of the adapter 35 with the pole body 21 and reliable connection of the adapter 35 with the tab group 33, while the bending portion 353 is weakened, facilitating the bending of the adapter 35 at the position of the bending portion 353; Especially for the case that the structure of the adapter 35 is generally plate-shaped before assembly and the structure has a bending position after assembly, at this time the adapter 35 can realize the soft connection between the pole body 21 and the cell body 32, facilitating the bending of the adapter 35 at the position of the bending portion 353 during assembly, and improving the assembly convenience.

[0253] Of course, the adapter 35 can also have the same shape before and after assembly, for example, the adapter 35 is configured as a bending part 353 connecting the first connecting part 351 and the second connecting part 352 before and after assembly, at this time, the adapter 35 can realize the hard connection between the pole body 21 and the cell body 32. It can be seen that in the embodiment of the application, whether the adapter 35 is used to realize soft connection or hard connection, it can support the free end 331 of the tab group 33.

[0254] In some examples, the thickness of the first connecting part 351 and the second connecting part 352 is greater than the thickness of the bending part 353, at this time, at least one side of the thickness of the bending part 353 can be formed with a first groove to realize the thinning of the thickness of the bending part 353. In some other examples, the width of the first connecting part 351 and the second connecting part 352 is greater than the width of the bending part 353, at this time, at least one side of the width of the bending part 353 can be formed with a second groove to realize the shortening of the width of the bending part 353.

[0255] Please refer to FIG. 14 and FIG. 15, in some embodiments of the application, the adapter 35 includes a plurality of adapter foils 350, the plurality of adapter foils 350 are stacked and arranged, and the stacked part is connected to form the first connecting part 351 and the second connecting part 352, the first connecting part 351 and the second connecting part 352 are arranged in a spaced manner, the first connecting part 351 is connected with the pole body 21, and the second connecting part 352 is connected with the tab part 332.

[0256] It should be noted that for the first connecting part 351, any two adjacent adapter foils 350 in the plurality of adapter foils 350 are directly connected or indirectly connected; for the second connecting part 352, any two adjacent adapter foils 350 in the plurality of adapter foils 350 are directly connected or indirectly connected, for example, the two adjacent adapter foils 350 are indirectly connected through the tab part 332 of the tab group 33.

[0257] Exemplarily, a part of the plurality of adapter foils 350 is directly connected to form the first connecting portion 351, and another part of the plurality of adapter foils 350 is directly connected to form the second connecting portion 352, and the second connecting portion 352 is connected to the tab portion 332 of the tab group 33, and at this time, the plurality of adapter foils 350 corresponding to the second connecting portion 352 are located on the same side of the tab portion 332 of the tab group 33; or, the adapter 35 includes two adapter foils 350, a part of the two adapter foils 350 is directly connected to form the first connecting portion 351, and another part of the two adapter foils 350 is indirectly connected through the tab portion 332 of the tab group 33, so that the adapter 35 forms the second connecting portion 352, and at this time, the two adapter foils 350 corresponding to the second connecting portion 352 are located on opposite sides of the tab portion 332 of the tab group 33; or, the adapter 35 includes four adapter foils 350, a part of the four adapter foils 350 is connected to form the second connecting portion 352, and at this time, two of the four adapter foils 350 corresponding to the second connecting portion 352 are located on one side of the thickness of the tab portion 332 of the tab group 33, and the other two of the four adapter foils 350 corresponding to the second connecting portion 352 are located on the other side of the thickness of the tab portion 332 of the tab group 33, and then the two adapter foils 350 of the second connecting portion 352 located on the same side of the tab portion 332 of the tab group 33 are directly connected, and the adapter foils 350 of the second connecting portion 352 located on the opposite side of the tab portion 332 of the tab group 33 are indirectly connected through the tab portion 332 of the tab group 33; of course, the number of adapter foils 350 of the adapter 35 is not limited to two or four, and can be three, five or more than five.

[0258] In the above technical solution, by setting the adapter 35 to include a plurality of adapter foils 350 stacked, the number of adapter foils 350 and the structure and size of a single adapter foil 350 can be flexibly set, so that the adapter 35 has flexible structure and size design, improves the applicability and practicality of the adapter 35, and is conducive to reducing the connection difficulty with the pole main body 21 and the connection difficulty with the tab group 33, and improving the assembly convenience.

[0259] In addition, since the first connecting portion 351 and the second connecting portion 352 are connected by the partial area of the plurality of adapter foils 350 stacked, the surfaces of the two adjacent adapter foils 350 opposite to each other are partially connected, not entirely connected, which is conducive to reducing the processing procedure of the adapter 35. In addition, since the thickness of the single adapter foil 350 is relatively small compared to the thickness of the adapter 35, the plurality of adapter foils 350 is equivalent to a plurality of thin plates, and the adapter 35 formed by the plurality of adapter foils 350 is more easily bent compared to an integrally formed adapter foil, and the rigidity of the partial area of the adapter 35 is relatively small, which facilitates the bending of the adapter 35 at the area with the above-mentioned small rigidity during the assembly of the battery monomer 102, so that the arrangement of the adapter 35 facilitates the soft connection between the tab group 33 and the pole body 21, so that the adapter 35 is bent into a certain form during the assembly of the battery monomer 102, and then meets the design requirements. For example, the plurality of adapter foils 350 can be welded at several key positions by ultrasonic welding or the like to connect the plurality of adapter foils 350 together.

[0260] Please refer to FIG. 7, in some embodiments of the present application, the adapter 35 forms a third connecting portion 354 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.

[0261] It can be understood that in the part of the plurality of adapter foils 350 of the adapter 35 corresponding to the third connecting portion 354, the two adjacent adapter foils 350 are not connected, so that the rigidity of the third connecting portion 354 is smaller than that of the first connecting portion 351 and the second connecting portion 352, which is conducive to bending at the third connecting portion 354, so that when the structure of the adapter 35 changes during assembly, for example, the third connecting portion 354 is not bent before assembly, and the third connecting portion 354 is bent to form a bent portion 353 after assembly, which is conducive to improving the assembly convenience. In addition, the bent adapter 35 can play a role of buffering support on the premise of reliably supporting the free end 331 of the tab group 33, which is conducive to reducing the risk of the battery cell component 3 impacting the shell component 1 and improving the reliability of the battery monomer 102.

[0262] Please refer to FIG. 7, FIG. 14 and FIG. 15, in some embodiments of the present application, the plurality of adapter foils 350 includes at least one first adapter foil 3501 and at least one second adapter foil 3502, and the first adapter foil 3501 and the second adapter foil 3502 are connected to the two sides of the thickness of the free end 331, respectively.

[0263] In the technical solution, the first adapter foil 3501 and the second adapter foil 3502 are respectively connected to the two sides of the thickness of the free end 331, 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 cracking of the tab sheet 311 of the tab group 33 due to thin thickness, and improve the welding quality between the tab group 33 and the adapter 35 and the connection reliability of the tab group 33 and the adapter 35.

[0264] It can be understood that the number of the first adapter foil 3501 can be equal to or different from the number of the second adapter foil 3502, and the number of all the adapter foils 350 of the adapter 35 can be odd or even.

[0265] Exemplarily, the plurality of adapter foils 350 includes 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 the two 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 as 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 as a clamping part 3561, so as to facilitate the formation of the clamping structure 356.

[0266] Please refer to FIG. 7, in some embodiments, all the tab groups 33 of the battery cell group 32A are folded and bent to form an open slot, the adapter 35 includes a first connecting part 351 and a second connecting part 352, the first connecting part 351 is connected with the pole part 2, the second connecting part 352 extends into one of the open slots, and the second connecting part 352 is connected with the tab part 332 to support the tab part 332, so as to prevent the tab part 332 from moving towards the battery cell body 32.

[0267] For example, at least part of the second connecting part 352 can be supported on the side of the tab part 332 of the tab group 33 facing the battery cell body 32, i.e., at least part of the second connecting part 352 can be supported on the side of the tab part 332 of the tab group 33 facing away from the pole body 21, so that the tab part 332 of the tab group 33 is located between the part of the adapter 35 supporting the tab part 332 and the inner end surface 211 of the pole body 21. The above supporting arrangement of the adapter 35 can prevent the tab part 332 from moving towards the battery cell body 32, for example, when the tab group 33 is subjected to an external force and has a tendency to move towards the battery cell body 32, the adapter 35 can exert a counterforce on the tab part 332 to hinder the movement tendency of the tab part 332 towards the battery cell body 32, thereby reducing the risk of the tab group 33 moving towards the battery cell body 32 to cause short circuit due to the tab group 33 being invertedly inserted into the battery cell body 32, and improving the reliability of the battery monomer 102.

[0268] In this embodiment, each electrode group 33 includes multiple electrode tabs 331. All electrode tabs 331 of the cell group 32 converge and connect at a position away from the cell body 32 to form an electrode portion 332. At least a portion of the electrode portion 332 is connected to at least a portion of the second connection portion 352 on the side away from the cell body 21. Thus, the electrode portion 332 is located at the free end 331 of the electrode group 33. The "free end 331 of the electrode group 33" can be understood as the end of the electrode group 33 away from the cell body 32 in the extension direction of the electrode group 33. The electrode group 33 has a first end and a second end in its extension direction. The first end is connected to the cell component 3, and the second end is the free end 331 of the electrode group 33. The "inner end face 211 of the electrode post body 21" is the end surface of the electrode post body 21 facing the cell component 3. In some examples, the inner end face 211 of the pole body 21 is electrically connected to the adapter 35, which can reduce the assembly and connection difficulty between the adapter 35 and the pole body 21 and improve processing efficiency. Compared with the adapter 35 being connected to other parts of the pole body 21, it is beneficial to shorten the length of the adapter 35 and save materials and costs. Of course, in other examples, the adapter 35 can also be electrically connected to other parts of the pole body 21.

[0269] It should be noted that, in the embodiments of this application, the adapter 35 supports the tab portion 332 of the tab assembly 33, such that the tab portion 332 of the tab assembly 33 is located between the portion of the adapter 35 used to support the tab portion 332 and the inner end face 211 of the pole body 21. The tab portion 332 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 tab portion 332 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 provided between the tab portion 332 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 provided between the tab portion 332 of the tab assembly 33 and the inner end face 211 of the pole body 21.

[0270] It should be noted that in the embodiments of the present application, the tab pieces 311 are divided into positive tab pieces 311 and negative tab pieces 311, the positive tab pieces 311 that need to be gathered together are stacked together and connected (for example, ultrasonic pre-welding) to form the positive tab portion 332, which can reduce the interlayer gap of the free end 331 of the tab group 33, so that the fluffy multiple positive tab pieces 311 form a sheet structure with a certain rigidity at the free end 331. Similarly, the negative tab pieces 311 that need to be gathered together are stacked together and connected (for example, ultrasonic pre-welding) to form the negative tab portion 332, which can reduce the interlayer gap of the free end 331 of the tab group 33, so that the fluffy multiple negative tab pieces 311 form a sheet structure with a certain rigidity at the free end 331.

[0271] Please refer to FIG. 7, in some embodiments, the orthographic projection of the above-mentioned at least part of the tab 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 tab portion 332.

[0272] In the above technical solution, by setting the orthographic projection of the supported part of the tab portion 332 (i.e., at least part of the tab portion 332) on the first shell wall 111 within the orthographic projection range of the second connecting portion 352, and the thickness of the second connecting portion 352 being greater than or equal to the thickness of the tab portion 332, the cross-sectional area of the second connecting portion 352 is greater than or equal to the cross-sectional area of the tab portion 332, which is beneficial to reduce the resistance at the connection position of the second connecting portion 352 and the tab portion 332, and improve the overcurrent capacity at the connection position of the second connecting portion 352 and the tab portion 332, thereby facilitating the reduction of the internal resistance of the battery monomer 102 and the improvement of the overcurrent capacity of the battery monomer 102.

[0273] For example, the first direction is perpendicular to the first shell wall 111, the face where the first shell wall 111 is located is the projection face, and the first direction is the projection direction. If the orthographic projection of the part supported by the adapter 35 of the tab portion 332 is within the orthographic projection range of the first connecting portion 352, then the size of the tab portion 332 in the second direction is less than or equal to the size of the second connecting portion 352 in the second direction, and the size of the tab portion 332 in the third direction is less than or equal to the size of the second connecting portion 352 in the third direction.

[0274] Please refer to FIG. 7, in some embodiments of the present application, the multiple tab pieces 311 of the tab group 33 converge to form a gathering portion 333 near the position of the battery core body 32, one end of the gathering portion 333 is connected to the tab portion 332 by bending, the other end of the gathering portion 333 is connected to the battery core body 32, and the end face of the part where the second connecting portion 352 is connected to the tab portion 332 extends to the position near the bending of the gathering portion 333.

[0275] In the technical solution, the folding connection of the gathering part 333 and the tab part 332 can make the tab group 33 fold to form the first opening slot 334, the tab part 332 and the gathering part 333 are respectively two opposite side slot walls of the first opening slot 334, the end surface of the part of the adapter 35 for supporting the free end 331 extends to the position close to the bending of the gathering part 333, which is convenient for the end surface of the part of the adapter 35 for supporting the free end 331 to extend beyond the tab part 332, so that the adapter 35 supports the entire tab part 332.

[0276] In the technical solution, the folding connection of the gathering part 333 and the tab part 332 can make the tab group 33 fold to form the first opening slot 334, the tab part 332 and the gathering part 333 are respectively two opposite side slot walls of the first opening slot 334, the end surface of the part of the adapter 35 for supporting the free end 331 extends to the position close to the bending of the gathering part 333, which is convenient for the end surface of the part of the adapter 35 for supporting the free end 331 to extend beyond the tab part 332, so that the adapter 35 supports the entire tab part 332.

[0277] In the embodiment of the present application, the gathering and connection of the plurality of tab pieces 311 of the tab group 33 close to the position of the battery body 32 to form the tab part 332, and the gathering of the plurality of tab pieces 311 of the tab group 33 away from the position of the battery body 32 to form the gathering part 333 are intended to explain that along the extension direction of the tab piece 311, the gathering part 333 and the tab part 332 are sequentially arranged in the direction away from the battery body 32, and the specific positions of the tab part 332 and the gathering part 333 are not limited, that is, it is not required that the gathering part 333 is close to the battery body 32, and it is not required that the tab part 332 is far away from the battery body 32. In some optional examples, the current collector of the battery body 32 and the tab piece 311 can be an integral piece, for example, for the positive tab piece, it can be an integrally formed aluminum foil, for example, for the negative tab piece, it can be an integrally formed copper foil, and the like.

[0278] Please refer to FIG. 16-FIG. 21, in some embodiments of the present application, the battery cell 102 further comprises an insulating component 4, the insulating component 4 is arranged in the accommodating cavity 13, and the insulating component 4 is formed with a through hole 40, the insulating component 4 blocks the part of the lug group 33 and / or the adapter 35 passing through the through hole 40 to the side of the insulating component 4 away from the cell body 32 from the cell body 32, then the insulating component 4 blocks the part of the lug group 33 passing through the through hole 40 to the side of the insulating component 4 away from the cell body 32 from the cell body 32, and / or, the insulating component 4 blocks the part of the adapter 35 passing through the through hole 40 to the side of the insulating component 4 away from the cell body 32 from the cell body 32.

[0279] It can be seen that at least part of the insulating component 4 is arranged between the end of the cell body 32 connected with the lug group 33 and the pole body 21, the through hole 40 can be passed through by the lug group 33 and / or the adapter 35, so that the lug group 33 and / or the adapter 35 can pass through to the side of the insulating component 4 away from the cell body 32 to be electrically connected with the pole body 21, therefore the insulating component 4 can be used to isolate the cell body 32 from the first shell wall 111 of the shell component 1, reduce the probability of the cell body 32 contacting the first shell wall 111 of the shell component 1, thereby reducing the risk of the first shell wall 111 of the shell component 1 being corroded by the naked cell body 32, reducing the risk of the cell body 32 itself failing, and reducing the risk of liquid leakage, thereby improving the reliability and stability of the battery cell 102.

[0280] Moreover, if the end of the cell body 32 is connected with the conductive part 4, the conductive part 4 is electrically connected with the pole body 21, the conductive part 4 comprises the lug group 33 and the adapter 35, since the insulating component 4 blocks the part of the lug group 33 and / or the adapter 35 passing through the through hole 40 to the side of the insulating component 4 away from the cell body 32 from the cell body 32, the insulating component 4 blocks the part of the conductive part passing through the through hole 40 to the side of the insulating component 4 away from the cell body 32 from the cell body 32, so as to arrange the part of the conductive part passing through the through hole 40 to the side of the insulating component 4 away from the cell body 32 away from the cell body 32, reduce the probability of the conductive part being inserted into the inside of the cell body 32 due to redundancy, thereby reducing the risk of short circuit of the battery cell 102, and improving the use reliability of the battery cell 102.

[0281] Exemplarily, if the tab group 33 is threaded through the through hole 40, a portion of the tab group 33 is threaded through the through hole 40 to the side of the insulating component 4 facing away from the core body 32, the adapter 35 can be located on the side of the insulating component 4 facing away from the core body 32 through the through hole 40, at this time, the insulating component 4 can block between the portion of the tab group 33 threaded through the through hole 40 to the side of the insulating component 4 facing away from the core body 32 and the core body 32, and / or, block between the adapter 35 and the core body 32; if the adapter 35 is threaded through the through hole 40, a portion of the adapter 35 and the tab group 33 are located on the side of the insulating component 4 facing the core body 32, and another portion of the adapter 35 is located on the side of the insulating component 4 facing away from the core body 32, at this time, the insulating component 4 can block between the above-mentioned another portion of the adapter 35 and the core body 32.

[0282] Please refer to FIG. 16 and FIG. 17, in some embodiments of the present application, the insulating component 4 comprises an insulating film 41, the insulating film 41 fully covers the core body 32, then the insulating film 41 covers all surfaces of the core body 32, so that the insulating film 41 can isolate the outer surface of the core body 32 from the shell component 1, reduce the risk of corrosion of the shell component 1 caused by the bare leakage of the core body 32, reduce the risk of failure of the core body 32 itself, and reduce the risk of liquid leakage, thereby improving the reliability and stability of the battery monomer 102.

[0283] Wherein, the insulating film 41 is formed with a through hole 40 at a position opposite to the first shell wall 111, the portion of the insulating film 41 surrounding the through hole 40 blocks between the portion of the tab group 33 threaded through the through hole 40 to the side of the insulating film 41 facing the core body 32 and the core body 32, and the portion of the insulating film 41 surrounding the through hole 40 blocks between the portion of the tab group 33 threaded through the through hole 40 to the side of the insulating film 41 facing away from the core body 32 and the core body 32.

[0284] In the above technical solution, since the portion of the insulating film 41 surrounding the through hole 40 blocks the portion of the tab group 33 passing through the through hole 40 to the side of the insulating film 41 facing the pole body 21 and the portion between the pole body 21 and the cell body 32, the size of the through hole 40 on the insulating film 41 is adapted to the size of the tab group 33, for example, the size of the first escape hole is adapted to the thickness of the portion of the tab group 33 located at the first escape hole. On the one hand, the through hole 40 allows the tab group 33 to pass through smoothly to be electrically connected to the pole body 21. On the other hand, when the tab group 33 is passed through the through hole 40, the insulating film 41 can still cover the multiple tab pieces 311 of the tab group 33 adjacent to the root of the cell body 32, further insulating the cell body 32, reducing the risk of the cell body 32 being exposed, and separating the portion of the tab group 33 passing through the through hole 40 from the cell body 32, reducing the risk of the tab group 33 and / or the adapter 35 being inserted into the cell body 32 and the root of the tab group 33 adjacent to the cell body 32, thereby further reducing the risk of short circuit of the battery monomer 102.

[0285] In some examples, the through hole 40 on the insulating film 41 is a normally open hole adapted to the size of the tab group 33, that is, the size of the through hole 40 is greater than zero when the insulating film 41 is in a natural state (the insulating film 41 is not pressed by the tab group 33). Thus, the tab group 33 can quickly pass through the insulating film 41, improving the efficiency of the insulating film 41 wrapping the cell body 32, thereby improving the assembly efficiency of the battery monomer 102. During the process of the tab group 33 passing through the insulating film 41, the tab group 33 can avoid the insulating film 41, thereby reducing the risk of deformation of the tab group 33 and reducing the operation step of shaping the tab group 33, thereby improving the assembly efficiency of the battery monomer 102.

[0286] In some examples, the insulating film 41 is provided with a tear structure 411 opposite the first shell wall 111, which is adapted to be torn by the tab group 33 to form the through hole 40. For example, during the process of wrapping the insulating film 41 on the outside of the cell body 32, when the tab group 33 opens the tear structure on the insulating film 41, an openable through hole 40 is formed on the insulating film 41, allowing the tab group 33 to pass through the through hole 40 smoothly. Since the through hole 40 has a self-closing feature, after the tab group 33 is passed in place, the through hole 40 can gradually close, allowing the insulating film 41 to cover at least a portion of the multiple tab pieces 311 of the tab group 33 adjacent to the root of the cell body 32.

[0287] Therefore, by setting the tearing structure, the insulation protection can be formed on the root of the plurality of tab pieces 311 of the tab group 33 adjacent to the battery body 32, the part of the tab group 33 passing through the through hole 40 is separated from the root of the plurality of tab pieces 311 of the tab group 33 adjacent to the battery body 32, the probability of the tab group 33 being inserted into the inside of the battery body 32 and the root of the plurality of tab pieces 311 of the tab group 33 adjacent to the battery body 32 is reduced, and thus the risk of short circuit of the battery monomer 102 can be reduced.

[0288] Please refer to FIGS. 18-21, in some embodiments of the present application, the insulation component 4 includes an insulation support 42, which is arranged on the side of the battery body 32 facing the first shell wall 111, so as to support the battery body 32 through the insulation support 42 and separate the battery body 32 from the first shell wall 111, thereby reducing the probability of the battery body 32 contacting the first shell wall 111, reducing the risk of the first shell wall 111 being corroded due to the bare leakage of the battery body 32, reducing the risk of liquid leakage, and improving the reliability and stability of the battery monomer 102.

[0289] In the above technical solution, the part of the insulation support 42 surrounding the through hole 40 is interposed between the adapter 35 and the battery body 32, at this time, the adapter 35 can be located on the side of the insulation support 42 away from the battery body 32, and the tab group 33 passes through the through hole 40 on the insulation support 42.

[0290] In the above technical solution, the part of the insulation support 42 surrounding the through hole 40 is interposed between the adapter 35 and the battery body 32, at this time, the adapter 35 can be located on the side of the insulation support 42 away from the battery body 32, and the tab group 33 passes through the through hole 40 on the insulation support 42.

[0291] Further, the end of the insulation support 42 and the adapter 35 facing the battery body 32 abuts, and the insulation support 42 can indirectly support the free end 331 of the tab group 33 through the adapter 35, thereby improving the support reliability of the free end 331 of the tab group 33, further reducing the probability of the tab group 33 being inserted into the inside of the battery body 32 and the root of the tab group 33 adjacent to the battery body 32, reducing the risk of short circuit, and improving the reliability of the battery monomer 102.

[0292] Please refer to FIG. 18 and FIG. 19, in some embodiments of the present application, the insulating component 4 comprises an insulating support 42, the through hole 40 on the insulating support 42 has a first hole wall and a second hole wall oppositely arranged in the width direction of the pole body 21, the insulating support 42 comprises a support body and a first partition sheet, the support body is arranged at one end of the battery body 32 facing the first shell wall 111, the first partition sheet is arranged at the first hole wall, and the first partition sheet is connected with the support body and extends towards the center of the through hole 40, the first partition sheet blocks between the adapter 35 and the battery body 32; at this time, the insulating support 42 does not comprise a second partition sheet described below.

[0293] It can be understood that the first partition sheet can be arranged parallel to the width direction of the pole body 21, or inclined relative to the width direction of the pole body 21.

[0294] Please refer to FIG. 20 and FIG. 21, in some embodiments of the present application, the insulating component 4 comprises an insulating support 42, the through hole 40 on the insulating support 42 has a first hole wall and a second hole wall oppositely arranged in the width direction of the pole body 21, the insulating support 42 comprises a support body, a first partition sheet and a second partition sheet, the support body is arranged at one end of the battery body 32 facing the first shell wall 111, the first partition sheet is arranged at the first hole wall, and the first partition sheet is connected with the support body and extends towards the center of the through hole 40, the first partition sheet blocks between the adapter 35 and the battery body 32, the second partition sheet is arranged at the second hole wall, and the second partition sheet is connected with the support body and extends towards the center of the through hole 40. It can be seen that the first partition sheet and the second partition sheet are arranged in a spaced manner to form the through hole 40 therebetween.

[0295] It can be understood that the second partition sheet can be arranged parallel to the width direction of the pole body 21, or inclined relative to the width direction of the pole body 21.

[0296] In some embodiments of the present application, the insulating component 4 comprises an insulating film 41 and an insulating support 42, the insulating film 41 fully covers the battery body 32, the insulating film 41 has a through hole 40 formed at a position opposite to the first shell wall 111, the part of the insulating film 41 surrounding the through hole 40 blocks between the part of the tab group 33 passing through the through hole 40 to the side of the insulating film 41 facing the pole body 21 and the battery body 32, the insulating support 42 is arranged at the side of the battery body 32 facing the first shell wall 111, the insulating support 42 has a through hole 40 formed at a position opposite to the pole component 2, and the part of the insulating support 42 surrounding the through hole 40 blocks between the adapter 35 and the battery body 32. Wherein, the through hole 40 on the insulating support 42 and the through hole 40 on the insulating film 41 can be oppositely arranged, and the insulating support 42 can cover at least part of the insulating film 41 on one end of the battery body 32 facing the first shell wall 111.

[0297] An insulating material piece is arranged 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 piece can be part of the pole component 2 (e.g., the insulating structure 23), or for example, the insulating material piece can be arranged between the pole component 2 and the shell component 1.

[0298] Please refer to FIGS. 22-25, in some embodiments of the present application, the pole component 2 further includes a transition structure 22 and an insulating structure 23, the transition structure 22 surrounds the pole body 21, and the transition structure 22 is connected with the first shell wall 111, and the insulating structure 23 is insulatingly fitted between the transition structure 22 and the pole body 21.

[0299] The transition structure 22 surrounds the pole body 21 along the circumference of the mounting hole 112, so that the transition structure 22 can play a role of connecting the pole body 21 and the first shell wall 111 in the outer peripheral region of the pole body 21, and the insulating structure 23 insulates the fitting position of the transition structure 22 and the pole body 21 to prevent the pole body 21 and the transition structure 22 from conducting short circuit. The connection mode of the transition structure 22 and the first shell wall 111 is not limited, for example, it can be welded, riveted, punched, bonded, etc.

[0300] In the above technical solution, the pole component 2 has a simple structure and is easy to process, and because it includes the pole body 21 and the transition structure 22, the shape and size of the pole body 21 and the shape and size of the transition structure 22 can be designed separately based on different factors to flexibly adapt to the connection requirements of different forms of shell components 1 and battery cell components 3, thereby increasing the application range of the pole component 2.

[0301] For example, the transition structure 22 can be arranged to match the shape of the mounting hole 112, and the shape of the mounting hole 112 can be designed as an elongated shape that is beneficial for the pole component 2 to pass through and has a small overturning angle of the pole component 2, and at the same time, the pole body 21 can be designed as an elongated shape that matches the shape of the transition structure 22, so that the pole body 21 has a large area to connect with the transition piece 35, or the pole body 21 can also be designed as a circular shape that does not match the shape of the transition structure 22, so as to facilitate reducing the connection area of the pole body 21 and the transition structure 22, improving the stress uniformity of the connection between the pole body 21 and the transition structure 22, thereby improving the connection reliability of the pole body 21 and the transition structure 22.

[0302] For example, the adapter structure 22 is formed in a long strip shape (e.g., a rectangular shape or a runway shape) extending along the length direction of the first shell wall 111, and the profile shape of the pole body 21 matches (e.g., a rectangular shape or a runway shape) the profile shape of the adapter structure 22. As described above, the battery cell component 3 is connected to the pole component 2 through the conductive part 4, and when the profile shape of the pole body 21 is formed in a long strip shape matching the profile shape of the adapter structure 22, the pole body 21 has a larger area, which is conducive to improving the connection area of the adapter 35 and the pole body 21, thereby improving the conductive performance.

[0303] For example, when the pole component 2 includes the pole body 21, the adapter structure 22, and the insulation structure 23, during the assembly of the battery monomer 102, the “connecting the battery cell component 3 to the pole component 2” can specifically include: connecting the battery cell component 3 to the pole body 21; disposing the pole component 2 connected to the battery cell component 3 at the mounting hole 112, and connecting the adapter structure 22 to the first shell wall 111.

[0304] Please refer to FIGS. 22-25. In some embodiments of the present application, the insulation structure 23 is also sealingly fitted between the adapter structure 22 and the pole body 21. Thus, the insulation structure 23 not only insulates the adapter structure 22 and the pole body 21, but also makes the fitting position of the adapter structure 22 and the pole body 21 present a sealed state, so as to isolate the inside and outside of the shell component 1 after the adapter structure 22 is connected to the first shell wall 111, reduce the risk of the electrolyte in the shell component 1 leaking from the fitting position of the adapter structure 22 and the pole body 21 to the outside of the shell component 1, and reduce the risk of liquid or dust outside the shell component 1 entering the shell component 1 from the fitting position of the adapter structure 22 and the pole body 21, thereby improving the reliability of the battery monomer 102.

[0305] In the above technical solution, since the insulation structure 23 is also sealingly fitted between the adapter structure 22 and the pole body 21, when the pole component 2 is installed to the first shell wall 111 and the adapter structure 22 is connected to the first shell wall 111, no sealing member needs to be disposed between the adapter structure 22 and the first shell wall 111, and no large sealing pressure needs to be applied to meet the compression degree of the sealing member, thereby reducing the stress on the first shell wall 111 and protecting the shell component 1, which is conducive to reducing the wall thickness of the shell component 1 and reducing the material cost. Moreover, since the first shell wall 111 is the end of the shell body 11 opposite to the opening 113, the stress at the connection between the first shell wall 111 and the second shell wall 114 can be reduced, and the stress on the second shell wall 114 can be reduced, thereby being conducive to ensuring the reliability of the shell body 11 and reducing the wall thickness and cost of the shell body 11.

[0306] Please refer to FIG. 22-25 again, in some embodiments of the present application, the insulation structure 23 comprises a sealing structure 231. In embodiments of the present application, the sealing structure 231 is made of a material that has both sealing and insulation properties, for example, it can be an elastic rubber piece.

[0307] Please refer to FIG. 22-25 again, for example, at least part of the sealing structure 231 is clamped between the adapter structure 22 and the pole body 21 in the inner-outer direction (for example, the fifth direction) of the first shell wall 111.

[0308] In embodiments of the present application, the direction from the inner side of the first shell wall 111 to the outer side of the first shell wall 111, and the direction from the outer side of the first shell wall 111 to the inner side of the first shell wall 111, are collectively referred to as the "inner-outer direction (for example, the fifth direction) of the first shell wall 111". The "inner side of the first shell wall 111" refers to the side of the first shell wall 111 facing the battery 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 battery cell component 3.

[0309] The sealing structure 231 at least comprises a shaft side 231a, the side of the shaft side 231a facing the accommodation cavity 13 is the inner side of the shaft side 231a, and the side of the shaft side 231a away from the battery cell component 3 is the outer side of the shaft side 231a, one of the adapter structure 22 and the pole body 21 is partially clamped on the outer side of the shaft side 231a, and the other is partially clamped on the inner side of the shaft side 231a, so that the shaft side 231a is clamped between the adapter structure 22 and the pole body 21 in the inner-outer direction (for example, the fifth direction F5) of the first shell wall 111, to achieve axial sealing between the adapter structure 22 and the pole body 21.

[0310] Therefore, by arranging at least part of the sealing structure 231 to be clamped between the adapter structure 22 and the pole body 21 in the inner-outer direction (for example, the fifth direction F5) of the first shell wall 111, axial sealing between the adapter structure 22 and the pole body 21 is achieved, and the axial sealing can achieve a more reliable sealing effect, improving the leakage problem of the mating position of the adapter structure 22 and the pole body 21. Moreover, the embodiments of the present application integrate the axial sealing (such as the shaft side 231a) into the pole component, which can reduce the axial force on the first shell wall 111.

[0311] Please refer again to Figures 22-25. 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.

[0312] 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.

[0313] Please refer again to Figures 22-25. 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.

[0314] 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.

[0315] In the embodiment, the side of the peripheral portion 212 facing away from the battery cell component 3 is the outer side of the peripheral portion 212, the side of the peripheral portion 212 facing the accommodating cavity 13 is the inner side of the peripheral portion 212, the adapter structure 22 is limited on the outer side of the peripheral portion 212 by the insulating structure 23 to limit the movement of the pole body 21 relative to the adapter structure 22 in the direction facing away from the battery cell component 3, and the adapter structure 22 is also limited on the inner side of the peripheral portion 212 by the insulating structure 23 to limit the movement of the pole body 21 relative to the adapter structure 22 in the direction facing the accommodating cavity 13, so that the adapter structure 22 is clamped on both sides of the peripheral portion 212 in the inner and outer directions (for example, the fifth direction F5) of the first shell wall 111 by the insulating structure 23.

[0316] In the above technical solution, the pole component 2 has a simple structure and is easy to process, and the relative fixation and insulating cooperation of the pole body 21 and the adapter structure 22 can be simply and effectively achieved. The peripheral portion 212 of the pole body 21 and the adapter structure 22 clamp the sealing structure 231, so that the sealing structure 231 can be in the cooperation position of the adapter structure 22 and the pole body 21, which is conducive to sealing the cooperation position of the adapter structure 22 and the pole body 21 in a shorter path, improving the reliability of the sealing, and is conducive to reducing the size of the sealing structure 231, reducing the sealing area, easily realizing compression sealing, and improving the sealing effect. Moreover, since at least part of the sealing structure 231 is clamped between the side of the peripheral portion 212 facing the battery cell component 3 and the adapter structure 22, the sealing structure 231 can be sealed from the side of the peripheral portion 212 facing the accommodating cavity 13, and the leakage of electrolyte from the cooperation position of the pole body 21 and the adapter structure 22 can be more effectively inhibited, thereby improving the sealing effect.

[0317] Please refer to Fig. 25 again. For example, the insulating structure 23 further includes a first insulating member 232, and the adapter structure 22 is clamped on both sides of the peripheral portion 212 in the inner and outer directions (for example, the fifth direction F5) of the first shell wall 111 by the first insulating member 232 and the sealing structure 231 respectively. In the embodiment, the adapter structure 22 is not limited in structure, and can be a single part or a combination of multiple parts (such as two or more).

[0318] Since at least part (such as the shaft side portion 231a) of the sealing structure 231 is arranged on the side of the peripheral portion 212 facing the battery cell component 3, at least part of the first insulating member 232 is arranged on the side of the peripheral portion 212 facing away from the battery cell component 3, and the adapter structure 22 can be clamped on both sides of the peripheral portion 212 in the inner and outer directions (for example, the fifth direction F5) of the first shell wall 111 by the first insulating member 232 and the sealing structure 231 respectively.

[0319] In the above technical solution, since the insulation structure 23 comprises the first insulation piece 232 and the sealing structure piece 231 which are not integrated into one piece, the design and processing of the insulation structure 23 can be simplified. Moreover, according to the specific matching requirements of the pole body 21 and the adapter structure 22, the first insulation piece 232 can be set as an insulation piece (for example, a plastic piece) which is substantially incompressible and does not have sealing effect, or the first insulation piece 232 can also be set as a sealing piece (for example, an elastic rubber piece) which is compressible and has sealing effect, so as to meet different actual requirements. In addition, when the first insulation piece 232 is an insulation piece (for example, a plastic piece) which is substantially incompressible and does not have sealing effect, the compression amount of the sealing structure piece 231 can be easily controlled, and the sealing effect is improved.

[0320] Alternatively, in some other embodiments of the present application, the sealing structure piece 231 can also be an integrated structure piece and wrap the peripheral portion 212, and the adapter structure 22 can be clamped on both sides of the peripheral portion 212 along the inner and outer directions (for example, the fifth direction F5) of the first shell wall 111 by the sealing structure piece 231. That is, the sealing structure piece 231 is an integral annular structure piece, that is, it has insulation and sealing properties, and the sealing structure piece 231 comprises shaft side portions 231a located on both the inner and outer sides of the peripheral portion 212. In this way, the adapter structure 22 can be clamped on both sides of the peripheral portion 212 along the inner and outer directions (for example, the fifth direction F5) of the first shell wall 111 by the two shaft side portions 231a of the sealing structure piece 231. In the above technical solution, since the sealing structure piece 231 is an integrated structure piece and wraps the peripheral portion 212, the number of parts can be reduced, and the assembly process is reduced.

[0321] Please refer to FIGS. 22-25 again. In some embodiments of the present application, the adapter structure 22 comprises a first adapter ring 221 and a second adapter ring 222, the second adapter ring 222 is located on the side of the first adapter ring 221 away from the battery cell component 3, the second adapter ring 222 is connected with the first adapter ring 221, and the first adapter ring 221 is connected with the first shell wall 111. The sealing structure piece 231 is clamped between the first adapter ring 221 and the peripheral portion 212, and the second adapter ring 222 is insulated and fixedly matched with the peripheral portion 212 by the first insulation piece 232.

[0322] For example, the first adapter ring 221 and the second adapter ring 222 can be connected by welding, riveting, punching, or bonding, for example, the outer ring of one of the first adapter ring 221 and the second adapter ring 222 is connected with the first shell wall 111 by welding, riveting, punching, or bonding. Exemplarily, the first adapter ring 221 and the second adapter ring 222 are both made of aluminum and are connected by welding, and the first adapter ring 221 and the first shell wall 111 are both made of aluminum and are connected by welding, so as to facilitate improving the welding yield.

[0323] Thus, the adapter structure 22 comprises the first adapter ring 221 and the second adapter ring 222 which are disposed inside and outside and assembledly connected, so as to facilitate the assembled connection of the adapter structure 22 with the insulating structure 23 and the pole body 21, and make the pole part 2 easy to process and manufacture, and make it easy to control the compression amount of the sealing structure 231, and improve the sealing reliability.

[0324] The second adapter ring 222 is not limited to be insulated and fixedly matched with the peripheral portion 212 by the first insulating member 232. For example, referring to FIGS. 22-25 again, the first insulating member 232 and the second adapter ring 222 can be injection-moldedly connected, respectively. For another example, referring to FIG. 26, which is a sectional view of a pole part provided in some embodiments of the present application; the second adapter ring 222 can comprise a stop ring portion 2221, and at least part of the first insulating member 232 is clamped between the stop ring portion 2221 and the peripheral portion 212 along the inside-outside direction (for example, the fifth direction F5) of the first shell wall 111, wherein the material of the first insulating member 232 is not limited, for example, it can be a plastic member or an elastic rubber member, etc.

[0325] Referring to FIG. 25 again, exemplarily, the adapter structure 22 further comprises a first insulating frame 224 connected to the side of the first adapter ring 221 facing the battery cell part 3. Thus, the first insulating frame 224 can be used to play an insulating role between the battery cell part 3 and the first adapter ring 221, reducing the difficulty of setting the insulating structure here. Exemplarily, the first insulating frame 224 has a latch, and the first adapter ring 221 has a socket, the latch is interference-inserted into the socket to realize the connection of the first insulating frame 224 and the first adapter ring 221.

[0326] Referring to FIG. 27, which is a sectional view of a pole part provided in some embodiments of the present application; in some embodiments of the present application, the adapter structure 22 comprises a third adapter ring 223, and the third adapter ring 223 comprises an integrally disposed inner extension portion 2231 and an outer extension portion 2232. That is, the inner extension portion 2231 and the outer extension portion 2232 are different parts of one integral piece, rather than two separate parts assembledly connected.

[0327] The end of the inner extension portion 2231 facing the pole body 21 (i.e., the inner ring of the inner extension portion 2231) and the end of the outer extension portion 2232 facing the pole body 21 (i.e., the inner ring of the outer extension portion 2232) are spaced apart along the inside-outside direction, so as to be clamped on both sides of the peripheral portion 212 along the inside-outside direction (for example, the fifth direction F5) of the first shell wall 111 by the insulating structure 23, respectively. The sealing structure 231 is clamped between the inner extension portion 2231 and the peripheral portion 212, and the outer extension portion 2232 is insulated and fixedly matched with the peripheral portion 212 by the first insulating member 232.

[0328] The third adapter ring 223 and the first shell wall 111 can be connected in various manners, for example, welding, riveting, punching, bonding, etc. For example, the third adapter ring 223 and the first shell wall 111 are both made of aluminum and are connected by welding, thereby facilitating improvement of welding yield.

[0329] The extension portion 2232 can be connected to the peripheral portion 212 in various manners. For example, referring to FIG. 27 again, the extension portion 2232 is riveted to press the first insulating member 232 against the peripheral portion 212. For another example, referring to FIG. 28, which is a sectional view of a pole part provided in some embodiments of the application, the first insulating member 232 and the pole body 21 are connected by injection molding, and the first insulating member 232 and the extension portion 2232 are connected by injection molding. The inner extension portion 2231 is riveted to press the sealing structure 231 against the peripheral portion 212.

[0330] For example, referring to FIG. 28 again, the adapter structure 22 further includes a second insulating frame 225 connected to a side of the third adapter ring 223 facing the battery cell part 3. In this way, the second insulating frame 225 can be used to insulate the battery cell part 3 from the third adapter ring 223, and the insulating structure is not needed to be arranged here. For example, the second insulating frame 225 has a plug, and the third adapter ring 223 has a hole, and the plug is inserted into the hole in an interference fit to connect the second insulating frame 225 and the third adapter ring 223.

[0331] For example, referring to FIGS. 29 and 30, in some embodiments of the application, the adapter structure 22 includes a fitting ring portion 2271, the pole body 21 includes a penetrating portion 214 penetrating the fitting ring portion 2271, and an inner limiting portion 215 and an outer limiting portion 216 connected to the penetrating portion 214 and clamped on the inner and outer sides of the fitting ring portion 2271. At least part of the sealing structure 231 is clamped between the fitting ring portion 2271 and the inner limiting portion 215.

[0332] For example, the adapter structure 22 includes a fourth adapter ring 227, the fourth adapter ring 227 includes a fitting ring portion 2271, and the fourth adapter ring 227 is connected to the first shell wall 111, for example, an outer ring of the fourth adapter ring 227 is connected to the first shell wall 111. The fourth adapter ring 227 and the first shell wall 111 can be connected in various manners, for example, welding, riveting, punching, bonding, etc. For example, the fourth adapter ring 227 and the first shell wall 111 are both made of aluminum and are connected by welding, thereby facilitating improvement of welding yield.

[0333] In the above technical solution, the pole post component 2 has simple structure and is easy to process, and the relative fixation and insulation cooperation of the pole post body 21 and the adapter structure 22 can be simply and effectively realized. The sealing structure 231 is clamped by the cooperation position of the pole post body 21 and the cooperation ring part 2271, so that the sealing structure 231 can be located at the cooperation position of the adapter structure 22 and the pole post body 21, which is conducive to sealing the cooperation position of the adapter structure 22 and the pole post body 21 in a shorter path, improves the reliability of the sealing, and is conducive to reducing the size of the sealing structure 231, reducing the sealing area, easily realizing compression sealing, and improving the sealing effect. Moreover, since at least part of the sealing structure 231 is clamped between the cooperation ring part 2271 and the inner limiting part 215, the sealing structure 231 can be sealed from the side of the cooperation ring part 2271 facing the accommodating cavity 13, and the leakage of electrolyte from the cooperation position of the pole post body 21 and the adapter structure 22 can be more effectively inhibited, thereby improving the sealing effect.

[0334] Please refer to Fig. 29 again, the insulation structure 23 can further include a second insulation part 234, wherein at least part of the sealing structure 231 is clamped between the inner limiting part 215 and the cooperation ring part 2271, and at least part of the second insulation part 234 is clamped between the outer limiting part 216 and the cooperation ring part 2271.

[0335] In the above technical solution, since the insulation structure 23 includes the second insulation part 234 and the sealing structure 231 which are not integrated as one part, the design and processing of the insulation structure 23 can be simplified. Moreover, according to the specific cooperation requirements of the pole post body 21 and the adapter structure 22, the second insulation part 234 can be set as an insulation part (such as a plastic part) which is basically incompressible and has no sealing effect, or the second insulation part 234 can also be set as a sealing part (such as an elastic rubber part) which is compressible and has a sealing effect, so as to meet different actual requirements. In addition, when the second insulation part 234 is an insulation part (such as a plastic part) which is basically incompressible and has no sealing effect, the compression amount of the sealing structure 231 can be easily controlled, and the sealing effect can be improved.

[0336] Alternatively, please refer to FIG. 30; in some other embodiments of the present application, the sealing structure 231 can also be an integral structure and surround the fitting ring portion 2271, so as to be respectively located on the side of the fitting ring portion 2271 facing the battery cell component 3 and the side of the fitting ring portion 2271 facing away from the battery cell component 3, and the pole body 21 is clamped on both sides of the fitting ring portion 2271 along the inner-outer direction (for example, the fifth direction F5) of the first shell wall 111 by the sealing structure 231. That is, the sealing structure 231 is an integral annular structure, that is, it has insulation and sealing properties, and the sealing structure 231 includes shaft side portions 231a respectively located on the inner and outer sides of the fitting ring portion 2271, so that the adapter structure 22 can be clamped on both sides of the fitting ring portion 2271 along the inner-outer direction (for example, the fifth direction F5) of the first shell wall 111 by the two shaft 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 fitting ring portion 2271, the number of parts can be reduced and the assembly process can be reduced.

[0337] In the embodiments of the present application, when the pole body 21 includes the penetrating portion 214, and the inner limiting portion 215 and the outer limiting portion 216 connected with the penetrating portion 214 and clamped on both sides of the fitting ring portion 2271, the pole body 21 is not limited in structure and can be a single part or a combination of multiple parts (such as two or more).

[0338] Exemplarily, please refer to FIG. 28 again, the outer limiting portion 216 is assembled and connected with the penetrating portion 214 on the side of the fitting ring portion 2271 facing away from the inner limiting portion 215. The assembly and connection between the outer limiting portion 216 and the penetrating portion 214 is not limited, for example, welding, punching, adhesive connection, etc., and assembly and connection means that two parts are connected together through a connection process. Therefore, the outer limiting portion 216 and the penetrating portion 214 are provided as separate parts and are assembled and connected, so that the structure of the pole body 21 is simple and easy to assemble and connect with the adapter structure 22. In addition, when the outer limiting portion 216 and the penetrating portion 214 are welded, the heat effect on the sealing structure 231 clamped between the inner limiting portion 215 and the fitting ring portion 227 can be reduced, and the sealing reliability of the sealing structure 231 can be improved.

[0339] In the above embodiment, the connection mode of the penetrating portion 214 and the inner limiting portion 215 is not limited, and the penetrating portion 214 and the inner limiting portion 215 can be an integral piece or separate pieces and be connected in advance. For example, the end of the penetrating portion 214 away from the inner limiting portion 215 can include a riveting portion 2141. During assembly, the penetrating portion 214 can be penetrated and fitted along the direction from the inner limiting portion 215 to the outer limiting portion 216 to the fitting ring portion 2271 of the insulation structure 23, and then the riveting portion 2141 is riveted to limit the penetrating portion 214 from being pulled out along the direction from the outer limiting portion 216 to the inner limiting portion 215. Then, the riveting portion 2141 and the outer limiting portion 216 can be connected, for example, welded, to facilitate the connection of the penetrating portion 214 and the outer limiting portion 216. Alternatively, the riveting portion 2141 can be omitted, and the riveting process after the penetrating portion 214 is penetrated can be omitted.

[0340] For example, please refer to FIG. 30 again; in some other embodiments of the present application, the outer limiting portion 216 and the penetrating portion 214 are an integral piece, and the outer limiting portion 216 rivets the second insulation piece 234 against the fitting ring portion 2271. In the above technical solution, the assembly and connection of the outer limiting portion 216, the insulation structure 23, and the adapter structure 22 are achieved by riveting, which reduces the heat generated when the outer limiting portion 216 is connected with the insulation structure 23 and the adapter structure 22, and reduces the heat influence on the sealing structure piece 231, thereby improving the sealing reliability of the sealing structure piece 231. In addition, the riveting of the outer limiting portion 216 presses the second insulation piece 234 against the fitting ring portion 2271, which easily controls the compression amount of the sealing structure piece 231 and achieves a better compression effect.

[0341] In the above embodiment, the connection mode of the penetrating portion 214 and the inner limiting portion 215 is not limited, and the penetrating portion 214 and the inner limiting portion 215 can be an integral piece or separate pieces and be connected in advance. For example, during assembly, the penetrating portion 214 can be penetrated and fitted along the direction from the inner limiting portion 215 to the outer limiting portion 216 to the fitting ring portion 2271 of the insulation structure 23, and then the outer limiting portion 216 is riveted to limit the relative movement of the pole piece 21 and the adapter structure 22.

[0342] The pole body 21 can be a solid structure or a hollow structure. When the pole body 21 is a hollow structure, refer to FIG. 29. The pole body 21 includes a first pole part 21a and a second pole part 21b. The second pole part 21b includes a penetrating part 214, an inner limiting part 215, and an outer limiting part 216, and is installed on the first shell wall 111. The penetrating part 214 surrounds a matching hole 21b1 penetrating in the inner-outer direction of the first shell wall 111. The first pole part 21a is assembled on the side of the second pole part 21b away from the battery cell part 3 and covers the matching hole 21b1, so as to form an accommodation space open in the direction towards the battery cell part 3 between the first pole part 21a and the second pole part 21b. Part of the conductive part 4 can extend into the accommodation space and be connected to the first pole part 21a. Thus, the pole body 21 can serve to accommodate the conductive part 4, so as to reduce the space occupation of the conductive part 4 in the accommodation cavity 13, and facilitate to improve the energy density of the battery monomer 102.

[0343] Again refer to FIG. 29. In some embodiments of the present application, the adapter structure 22 further includes a third insulating frame 228 connected to the side of the fourth adapter ring 227 facing the battery cell part 3. Thus, the third insulating frame 228 can serve to insulate between the battery cell part 3 and the fourth adapter ring 227, and the insulating structure is not needed to be arranged here. Illustratively, the third insulating frame 228 has a latch, and the fourth adapter ring 227 has a socket. The latch is inserted into the socket in interference fit, so as to connect the third insulating frame 228 and the fourth adapter ring 227.

[0344] Refer to FIG. 31. In some embodiments of the present application, the first shell wall 111 has a mounting hole 112, and a sealing ring 14 is arranged around the mounting hole 112. The sealing ring 14 is clamped between the pole part 2 and the first shell wall 111. Thus, the pole part 2 has a simple structure, is easy to process, and is easy to assemble and connect with the first shell wall 111.

[0345] In some embodiments of the present application, the first shell wall 111 has a mounting hole 112, and the pole part 2 covers the mounting hole 112. The edge of the adapter structure 22 is overlapped on one side of the wall thickness direction of the first shell wall 111. Thus, by covering the adapter structure 22 on one side of the wall thickness direction of the first shell wall 111, i.e. covering the adapter structure 22 on the outside of the first shell wall 111 or on the inside of the first shell wall 111, the assembly of the adapter structure 22 and the first shell wall 111 is facilitated.

[0346] Exemplarily, the adapter structure 22 is welded to the first shell wall 111. For example, after the adapter structure 22 is covered on the first shell wall 111, the adapter structure 22 and the first shell wall 111 can be connected by welding, so as to facilitate processing and better ensure the connection reliability of 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 welding seam formed by the connection of the two is exposed on the side of the first shell wall 111 away from the battery cell component 3 (i.e., the side away from the battery cell body 32), thereby facilitating welding operation and increasing welding space. The present application is not limited thereto, and for example, in some other embodiments of the present application, the adapter structure 22 can also be arranged to pass through the mounting hole 112 and be riveted to the first shell wall 111.

[0347] Please refer to FIG. 32 and FIG. 33, FIG. 32 shows the pole piece 2 before being covered on the first shell wall 111; and FIG. 33 shows the pole piece 2 after being covered on the first shell wall 111.

[0348] Please refer to FIG. 32 and FIG. 33, in some embodiments, when the connection of the battery cell component 3 and the pole piece 2 is performed first, and then the pole piece 2 is assembled and connected to the first shell wall 111, the pole piece 2 can be covered on the mounting hole 112 of the first shell wall 111 from the outside of the first shell wall 111 (i.e., the side away from the battery cell body 32) after the connection of the battery cell component 3 and the pole piece 2 (for example, the pole piece 2 and the battery cell component 3 can be connected first, and then assembled into the shell body 11 together, and then the pole piece 2 is extended out of the first shell wall 111; or for example, the battery cell component 3 is assembled into the shell body 11, the conductive part 4 is passed through the mounting hole 112 and connected to the pole piece 2 arranged on the outside of the first shell wall 111 in advance), and at this time, the edge of the adapter structure 22 is overlapped on the side of the first shell wall 111 away from the battery cell component 3. Thus, since the pole piece 2 is covered on the first shell wall 111 from the outside, the assembly and connection of the pole piece 2 and the first shell wall 111 are facilitated, and the connection reliability of the pole piece 2 and the first shell wall 111 is improved.

[0349] Please refer to FIG. 32 and FIG. 33, in some embodiments of the present application, when the edge of the adapter structure 22 overlaps the first shell wall 111 away from the side of the battery cell component 3, the first shell wall 111 can be provided with a first recess 1111 arranged around the mounting hole 112, the first recess 1111 is open towards the direction away from the battery cell component 3 (i.e. the first recess 1111 is open towards the direction 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 around the adapter structure 22, the flange portion 22a is embedded in the first recess 1111. Thus, it is convenient to support and position the connection between the adapter structure 22 and the first shell wall 111, which is conducive to the welding connection of the two from the outside of the first shell wall 111 (i.e. the side away from the battery cell body 32).

[0350] Please refer to FIG. 32 and FIG. 33 again, for example, the thickness of the flange portion 22a matches the groove depth T1 of the first recess 1111, wherein "match" means that the thickness of the flange portion 22a is basically consistent with the groove depth of the first recess 1111. Thus, it is convenient to weld the flange portion 22a and the first shell wall 111, the thickness of the flange portion 22a is not too large relative to the groove depth of the first recess 1111, which can reduce unnecessary occupation of space, and the thickness of the flange portion 22a is not too small relative to the groove depth of the first recess 1111, which can meet the welding strength requirement.

[0351] In combination with FIGS. 32-34, in some embodiments of the application, the mounting hole 112 is an elongated hole (e.g., rectangular, oval, or racetrack-shaped, etc.), and the pole piece 2 is formed as an elongated structure (e.g., rectangular, oval, or racetrack-shaped, etc.) matching the shape of the mounting hole 112. When the connection of the electrode piece 3 and the pole piece 2 is performed first, then the pole piece 2 is assembled and connected to the first shell wall 111 together with the electrode piece 3, and then the pole piece 2 is turned over from the outside of the first shell wall 111 to cover the mounting hole 112, and then the connection of the pole piece 2 and the first shell wall 111 is performed, if the pole piece 2 is arranged as an elongated structure matching the shape of the mounting hole 112, the pole piece 2 can be adjusted to an angle close to the width direction (e.g., the second direction F2 shown in FIG. 33) of the mounting hole 112 in the thickness direction of the pole piece 2 to pass through the mounting hole 112, and after the pole piece 2 passes through the mounting hole 112, the thickness direction of the pole piece 2 is turned to be close to the thickness direction (e.g., the first direction F1 shown in FIG. 33) of the first shell wall 111, so that the space required for the turning movement of the pole piece 2 is small, the space required for the turning of the pole piece 2 can be reduced, thereby being beneficial to shorten the length of the conductive part 4, save materials and reduce costs, and reduce the redundancy of the conductive part 4, reduce the space occupation of the conductive part 4 to the accommodation cavity 13, and be beneficial to improve the energy density of the battery monomer 102.

[0352] Please refer to FIGS. 34 and 35, in some embodiments, when the connection of the electrode piece 3 and the pole piece 2 is performed first, and then the pole piece 2 is assembled and connected to the first shell wall 111, after the connection of the electrode piece 3 and the pole piece 2, the electrode piece 3 and the pole piece 2 can be assembled and connected together into the shell body 11, so that the pole piece 2 can be covered at the mounting hole 112 of the first shell wall 111 from the inside of the first shell wall 111 (i.e., the side facing the electrode body 32), at this time, the edge of the adapter structure 22 is overlapped on the side of the first shell wall 111 facing the electrode piece 3. Therefore, since the pole piece 2 is arranged at the mounting hole 112 from the inside of the first shell wall 111, the electrode piece 3 and the pole piece 2 can be assembled and connected together into the shell body 11, and the pole piece 2 does not need to pass through the mounting hole 112, thereby reducing the operation steps and reducing the operation difficulty.

[0353] Referring to Figures 34 and 35, 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).

[0354] Referring again to Figures 34 and 35, 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.

[0355] 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.

[0356] 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.

[0357] 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.

[0358] Thus, by machining the adapter structure 22 into a protruding bump form, a portion of the accommodation groove 5 is formed on the side of the pole body 21 facing the battery cell component 3, another portion of the accommodation groove 5 is formed on the side of the adapter structure 22 facing the battery cell component 3, and the accommodation groove 5 is recessed in a direction away from the battery cell component 3 relative to the first shell wall 111, so that the side of the pole body 21 facing the battery cell component 3 and the side of the adapter structure 22 facing the battery cell component 3 both have space to accommodate the conductive part 4. In this way, not only is it convenient to accommodate the conductive part 4 to a greater extent, but it is also conducive to the form diversity design of the conductive part 4.

[0359] In other embodiments of the present application, in combination with FIG. 28, when the adapter structure 22 does not protrude in a direction away from the battery cell component 3 (i.e., a direction away from the battery cell body 32) relative to the first shell wall 111, the accommodation groove 5 recessed in a direction away from the battery cell component 3 relative to the first shell wall 111 can also be defined by the height difference between the adapter structure 22 and the pole body 21.

[0360] In some embodiments of the present application, referring again to FIG. 7, the surface of the end of the pole body 21 facing the battery cell component 3 is the inner end surface 211 of the pole body 21, and the inner end surface 211 of the pole body 21 participates in enclosing the accommodation groove 5, and the conductive part 4 is connected to the inner end surface 211 of the pole body 21. That is, at least part of the inner end surface 211 of the pole body 21 participates in defining the groove wall of the accommodation groove 5, and the conductive part 4 is connected to the part of the inner end surface 211 of the pole body 21 that serves as the groove wall of the accommodation groove 5. In the above technical solution, at least part of the accommodation groove 5 is enclosed by the side surface of the pole body 21 facing the battery cell component 3, and the conductive part 4 accommodated in the accommodation groove 5 can easily contact and connect to the pole body 21, improving connection convenience and simplifying the structure.

[0361] For example, when at least part of the conductive part 4 is accommodated in the accommodation groove 5, the pole connection part (such as the gathering part 313 of the tab group 33 or the second connection segment 412 or the first conductive segment 415 of the conductive piece 41) of the conductive part 4 (such as the tab group 33 or the conductive piece 41) can be laid on the inner end surface 211 of the pole body 21 and connected to the inner end surface 211 of the pole body 21. During machining, the pole connection part of the conductive part 4 can be first fitted into the accommodation groove 5, and then laid on the inner end surface 211 of the pole body 21 and connected to the inner end surface 211 of the pole body 21.

[0362] Exemplarily, the conductive part 4 can include a pole connecting part, which can be a relatively hard sheet shape, such as not being deformed downward under the action of gravity, for example, the folding part 313 (such as an ultrasonic welding mark) of the tab group 33 described herein, or the second connecting segment 412 (such as a metal sheet) or the first conductive segment 415 (such as a metal sheet) of the conductive piece 41.

[0363] Exemplarily, referring to FIG. 7, no matter whether the adapter structure 22 is raised relative to the first shell wall 111 in a direction away from the battery cell component 3, the position of the inner end face 220 of the adapter structure 22 adjacent to the pole body 21 is a surrounding area 2201 surrounding the pole body 21, and the surrounding area 2201 is flush with the inner end face 211 of the pole body 21. Among them, the inner end face 220 of the adapter structure 22 can be a planar structure, or a non-planar structure, for example, a raised shape, and the inner end face 220 of the adapter structure 22 is the surrounding area 2201 closest to the pole body 21.

[0364] Exemplarily, when the inner end face 211 of the pole body 21 is set to be larger (for example, the adapter structure 22 is formed in a long strip shape extending along the length direction of the first shell wall 111, and the contour shape of the pole body 21 matches the contour shape of the adapter structure 22), and when the surrounding area 2201 is flush with the inner end face 211 of the pole body 21, the pole connecting part (for example, the folding part 313 of the tab group 33 described herein, or the second connecting segment 412 of the conductive piece 41) of the conductive part 4 can be all laid on the inner end face 211 of the pole body 21.

[0365] Exemplarily, in combination with FIG. 26, when the inner end face 211 of the pole body 21 is small (for example, the adapter structure 22 is set to be a long strip shape extending along the length direction of the first shell wall 111, and the pole body 21 is arranged in the center of the adapter structure 22 and has a circular contour), and when the surrounding area 2201 is flush with the inner end face 211 of the pole body 21, a part of the pole connecting part (for example, the folding part 313 of the tab group 33 described herein, or the second connecting segment 412 of the conductive piece 41) of the conductive part 4 can be laid on the inner end face 211 of the pole body 21, and the remaining part is laid on the surrounding area 2201, so that the pole connecting part (for example, the pole connecting part is also a long strip shape) of the conductive part 4 as a whole can obtain support, facilitate the compression of the welding nozzle, and enable the conductive part 4 to be reliably connected with the pole body 21.

[0366] Exemplarily, the conductive part 4 can include a pole connecting part, which can be a relatively hard sheet shape, such as not being deformed downward under the action of gravity, for example, the folding part 313 (such as an ultrasonic welding mark) of the tab group 33 described herein, or the second connecting segment 412 (such as a metal sheet) or the first conductive segment 415 (such as a metal sheet) of the conductive piece 41.

[0367] Referring to FIG. 27, the position of the inner end surface 220 of the adapter structure 22 adjacent to the pole body 21 is a surrounding area 2201 surrounding the pole body 21, and the inner end surface 211 of the pole body 21 protrudes towards the direction of the battery cell component 3 out of the surrounding area 2201, regardless of whether the adapter structure 22 is raised relative to the first shell wall 111 in a direction away from the battery cell component 3. The inner end surface 220 of the adapter structure 22 can be a planar structure or a non-planar structure, such as a raised shape, and the inner end surface 220 of the adapter structure 22 has a surrounding area 2201 closest to the pole body 21.

[0368] Thus, by setting the inner end surface 211 of the pole body 21 to protrude towards the direction of the battery cell component 3 out of the surrounding area 2201, the pole body 21 can be inwardly retracted in the direction of the accommodation cavity 13, equivalent to reducing the space occupied by the pole component 2 outside the shell component 1, and reducing the size of the battery monomer 102 in the direction of the pole component 2 (for example, the first direction F1 shown in FIG. 3).

[0369] Exemplarily, when the inner end surface 211 of the pole body 21 is set to be larger (for example, the adapter structure 22 is formed in a long strip shape extending along the length direction of the first shell wall 111, and the contour shape of the pole body 21 matches the contour shape of the adapter structure 22), and when the inner end surface 211 of the pole body 21 protrudes towards the direction of the battery cell component 3 out of the surrounding area 2201, the pole connecting part (for example, the folding part 313 of the tab group 33 described herein, or the second connecting segment 412 of the conductive part 41) of the conductive part 4 can be completely laid on the inner end surface 211 of the pole body 21.

[0370] For example, in combination with FIG. 27, when the inner end surface 211 of the pole body 21 is small (for example, the adapter structure 22 is provided in a long strip shape extending along the length direction of the first shell wall 111, and the pole body 21 is arranged in the center of the adapter structure 22 and has a circular profile), and when the inner end surface 211 of the pole body 21 protrudes from the surrounding area 2201 in the direction towards the battery cell component 3, the conductive part 4 can be provided to include the tab group 33 and the conductive piece 41 connected with the tab group 33, the conductive piece 41 includes the first conductive section 415 laid on the inner end surface 211 of the pole body 21, and the second conductive section 416 offset from the inner end surface 211 of the pole body 21, the second conductive section 416 protrudes in the direction away from the battery cell component 3 (that is, towards the outside, or in the direction away from the battery cell body 32) relative to the first conductive section 415, and the tab group 33 is connected with the second conductive section 416. In this way, the second conductive section 416 of the conductive piece 41 and the tab group 33 can be accommodated by the height difference of the inner end surface 211 of the pole body 21 relative to the surrounding area 2201, so that the space can be fully utilized, the space occupation of the conductive part 4 to the accommodation cavity 13 is reduced, and the energy density of the battery monomer 102 is improved. For example, if the part (such as the folded part 313 described herein) of the tab group 33 connected with the second conductive section 416 is in a long strip shape, the second conductive section 416 can also be provided in a long strip shape, and the first conductive section 415 can be provided in a circular shape matched with the pole body 21, so as to meet the connection requirements. In addition, when the conductive piece 41 includes the first conductive section 415 and the second conductive section 416, in order to ensure that the second conductive section 416 protrudes in the direction away from the battery cell component 3 relative to the first conductive section 415, the conductive piece 41 can be processed by using a material with a certain hardness and thickness, for example, the conductive piece 41 can be a metal sheet.

[0371] For example, referring to FIG. 28, regardless of whether the adapter structure 22 protrudes in the direction away from the battery cell component 3 relative to the first shell wall 111, the position of the inner end surface 220 of the adapter structure 22 adjacent to the pole body 21 is the surrounding area 2201 surrounding the pole body 21, and the surrounding area 2201 protrudes from the inner end surface 211 of the pole body 21 in the direction towards the battery cell component 3. Among them, the inner end surface 220 of the adapter structure 22 can be a planar structure, or a non-planar structure, for example, a protruding shape, and the most towards the pole body 21 of the inner end surface 220 of the adapter structure 22 is the surrounding area 2201.

[0372] For example, referring to FIG. 30, when the inner end surface 211 of the pole body 21 is set to be large (for example, the adapter structure 22 is formed in a long strip shape extending along the length direction of the first shell wall 111, and the contour shape of the pole body 21 matches the contour shape of the adapter structure 22), and when the surrounding area 2201 protrudes from the inner end surface 211 of the pole body 21 in the direction of the battery cell component 3, the pole connecting part (for example, the folding part 313 of the tab group 33 described herein, or the second connecting segment 412 of the conductive part 41) of the conductive part 4 can be all laid on the inner end surface 211 of the pole body 21.

[0373] For example, referring to FIG. 28, when the inner end surface 211 of the pole body 21 is small (for example, the adapter structure 22 is set to be a long strip shape extending along the length direction of the first shell wall 111, and the pole body 21 is arranged in the center of the adapter structure 22 and has a circular contour), and when the surrounding area 2201 protrudes from the inner end surface 211 of the pole body 21 in the direction of the battery cell component 3, the conductive part 41 can be arranged to include a first conductive segment 415 laid on the inner end surface 211 of the pole body 21, and a third conductive segment 417 offset from the inner end surface 211 of the pole body 21, the third conductive segment 417 protrudes in the direction of the battery cell component 3 relative to the first conductive segment 415, and the tab group 33 is connected to the third conductive segment 417. In this way, the adapter part 41 can not only meet the connection requirement with the inner end surface 211 of the pole body 21, but also easily meet the connection requirement with the tab group 33. In addition, when the conductive part 41 includes the first conductive segment 415 and the third conductive segment 417, in order to ensure that the third conductive segment 417 protrudes in the direction of the battery cell component 3 relative to the first conductive segment 415, the conductive part 41 can be made of a material with a certain hardness and thickness, for example, the conductive part 41 can be a metal sheet. For example, if the part (such as the folding part 313 described herein) of the tab group 33 connected to the third conductive segment 417 is a long strip shape, the third conductive segment 417 can also be arranged in a long strip shape, and the first conductive segment 415 can be arranged in a shape (for example, a circular shape) matched with the fitting area 211a, which can meet the connection requirement.

[0374] Please refer to FIG. 4 and FIG. 5, in some embodiments, the shell component 1 includes a shell body 11 and a shell cover 12, the shell body 11 is a one-piece, and one end of the shell body 11 is open, and the shell cover 12 is arranged at the open end of the shell body 11. For example, the open end of the shell body 11 has an opening, and the shell cover 12 is arranged on the opening, and the shell body 11 and the shell cover 12 together enclose a containing cavity 13. In combination with FIG. 4, the first shell wall 111 is located at the end of the shell body 11 away from the shell cover 12, that is, the shell wall at the end of the shell body 11 opposite to the opening is the first shell wall 111; or, in combination with FIG. 5, the first shell wall 111 is formed on the shell cover 12, and the shell cover 12 serves as the first shell wall 111.

[0375] Of course, in other examples, the shell component 1 can also include two shell bodies 11, each of which has an open end forming an opening, the openings of the two shell bodies 11 are opposite and cover each other, and the two shell bodies 11 together enclose the accommodation cavity 13, wherein one of the shell bodies 11 has a first shell wall 111 at the end opposite to the opening.

[0376] In some embodiments, in combination with FIG. 4, the shell component 1 includes a shell body 11 participating in enclosing the accommodation cavity 13, the shell body 11 has an open end forming an opening, and the end of the shell body 11 opposite to the opening has a first shell wall 111. It can be understood that the shell body 11 is a one-piece member, and includes the first shell wall 111 and a second shell wall 114 surrounding the edge of the first shell wall 111, and extending from the edge of the first shell wall 111 towards the side of the first shell wall 111 in the thickness direction, the end of the second shell wall 114 away from the first shell wall 111 defines the opening, and the space between the first shell wall 111 and the second shell wall 114 defines at least part of the accommodation cavity 13.

[0377] When the shell component 1 includes a shell body 11 having an opening 113 at one end, the shell component 1 also includes a shell body matching structure cooperating with the shell body 11 to cover the opening 113 and together with the shell body 11 to enclose the accommodation cavity 13. For example, the shell body 11 is a semi-closed cylinder, and the shell body matching structure is a flat plate, i.e., the shell body matching structure can be a shell cover 12, at this time, the shell component 1 can be a combination of the shell body 11 and the shell cover 12, for another example, the shell body 11 is a semi-closed cylinder, and the shell body matching structure can also be a semi-closed cylinder, i.e., the shell body matching structure can be another shell body 11, at this time, the shell component 1 can be a combination of two shell bodies 11, and so on. For another example, the shell body matching structure can be a shell set composed of multiple parts. In this way, the shell component has various forms and can adapt to various application scenarios.

[0378] For example, in combination with FIG. 4, the shell component 1 can include a shell body 11 and a shell cover 12, the shell body 11 has an opening 113 at one end, the shell cover 12 covers the opening 113, the shell body 11 and the shell cover 12 together enclose the accommodation cavity 13, and the end of the shell body 11 opposite to the opening 113 serves as the first shell wall 111; or, for another example, the shell component 1 can include two shell bodies 11, each of which has an opening 113 at one end, the openings 113 of the two shell bodies 11 are opposite and cover each other, and the two shell bodies 11 together enclose the accommodation cavity 13, wherein the end of one of the shell bodies 11 opposite to the opening 113 serves as the first shell wall 111.

[0379] In the above technical solution, when the end wall of the shell body 11 opposite to the opening is the first shell wall 111, and the electrode column component 2 is mounted on the first shell wall 111, when the battery 100 is vibrated or deformed, the electrode column components 2 connected by the busbar component will be pulled by each other. Since the electrode column component 2 is arranged on the end wall of the shell body 11 opposite to the opening 113, the force acting on the electrode column component 2 will be preferentially transmitted to the shell body 11, and will not directly act on the shell body cooperating structure (such as the shell cover 12), thereby not only can the distance of force transmission to the connection between the shell body 11 and the shell body cooperating structure (such as the shell cover 12) be prolonged, but also the shell body 11 will preferentially deform when stressed, so as to reduce the stress at the connection between the shell body 11 and the shell body cooperating structure (such as the shell cover 12), thereby effectively reducing the probability of cracking at the connection between the shell body 11 and the shell body cooperating structure (such as the shell cover 12) during use of the battery 100, and improving the reliability of the battery monomer 102. Moreover, since the connection position of the shell body 11 and the shell body cooperating structure (such as the shell cover 12) is not easy to crack, the wall thickness of the two is not needed to be increased in order to increase the connection reliability, thereby being beneficial to reducing the weight and material cost, and being beneficial to realizing the miniaturization of the battery monomer 102, or improving the energy density of the battery monomer 102. The connection mode of the shell body 11 and the shell body cooperating structure is not limited, for example, can be adhesion, welding, etc.

[0380] Exemplarily, when the end wall of the shell body 11 opposite to the opening 113 is the first shell wall 111 for mounting the electrode column component 2, if the electrode column component 2 is first mounted at the mounting hole 112 of the first shell wall 111, and then the electric core component 3 is assembled into the shell body 11, it is difficult to connect the electric core component 3 and the electrode column component 2. In some embodiments of the present application, the connection of the electric core component 3 and the electrode column component 2 can be performed first, and then the electrode column component 2 is assembled and connected to the shell component 1, thereby meeting the connection requirements of the electric core component 3 and the electrode column component 2, and also meeting the connection requirements of the electrode column component 2 and the shell component 1, thereby improving the reliability and processability of the battery monomer 102.

[0381] Moreover, such a processing sequence can effectively shorten the length of the conductive part 4, for example, as long as the first connection of the electric core component 3 and the electrode column component 2 and the later connection of the electrode column component 2 and the shell component 1 can be met, thereby saving the material and cost of the conductive part 4, reducing the redundancy of the conductive part 4, reducing the short circuit risk, and reducing the space occupation of the conductive part 4 in the shell component 1, thereby being beneficial to improving the energy density of the battery monomer 102.

[0382] Please refer to FIG. 3, in some embodiments of the present application, the battery monomer 102 further comprises a pressure relief component 6, which is arranged on the shell component 1. Exemplarily, the pressure relief component 6 can be an explosion-proof valve mounted on the shell component 1, or a thinned area integrally formed on the shell component 1. Thus, by arranging the pressure relief component 6, when the pressure in the shell component 1 exceeds the preset value, the pressure relief component 6 can be used to direct the pressure relief, thereby improving the reliability of the battery monomer 102. Wherein, the pressure relief component 6 can be arranged on the first shell wall 111, or on other shell walls except the first shell wall 111, and the first shell wall 111 can be one or more.

[0383] Exemplarily, in combination with FIG. 3, the pressure relief component 6 and the pole column component 2 are located on the same side. Since the pole column component 2 is arranged on the first shell wall 111, when the pressure relief component 6 is also arranged on the first shell wall 111, the pressure relief component 6 and the pole column component 2 are located on the same side. Thus, the design of other shell walls except the first shell wall 111 can be simplified, and the structure and processing of the battery monomer 102 can be simplified.

[0384] Exemplarily, the pressure relief component 6 and the pole column component 2 are located on different sides. Since the pole column component 2 is arranged on the first shell wall 111, when the pressure relief component 6 is arranged on other walls of the shell component 1 except the first shell wall 111, for example, the pressure relief device 6 is arranged on the second shell wall 114, or the pressure relief device 6 is arranged on the shell cover 12, the pressure relief device 6 and the pole column component 2 are located on different sides. Thus, it is not necessary to consider that the pressure relief component 6 occupies the space of the first shell wall 111 to reduce the volume of the pole column component 2, so that the shape and volume of the pole column component 2 can be flexibly designed as needed.

[0385] For example, the shell component 1 can be surrounded by multiple non-coplanar shell walls, for example, the shell wall component of a cuboid is surrounded by six shell walls, one of which is the first shell wall 111, the pressure relief component 6 is arranged on any other shell wall except the first shell wall 111, and the pole column component 2 is arranged on the first shell wall 111, then the two are located on different sides.

[0386] In a second aspect, the embodiments of the present application provide a processing method, which is used for processing the battery monomer 102 described above. Please refer to FIG. 36, the processing method comprises:

[0387] Step S10, all the tab groups 33 of the battery cell group 32A are extended towards the position close to the middle of the battery cell group 32A in the first direction; step S20, the battery cell component 3 is loaded into the accommodating cavity 13, and the one end of the battery cell component 3 arranged with the tab group 33 is arranged on the inner side of the first shell wall 111 opposite to the first shell wall 11; step S30, the pole column component 2 is mounted on the first shell wall 111, and all the tab groups 33 are connected with the pole column main body 21.

[0388] The inner side of the first shell wall 111 refers to the side of the first shell wall 111 in the thickness direction that faces the battery cell body 32. Similarly, the outer side of the first shell wall 111 refers to the side of the first shell wall 111 in the thickness direction that is away from the battery cell body 32.

[0389] The order of installing the pole piece 2 on the first shell wall 111 and connecting the tab group 33 to the pole body 21 through the adapter 35 is not limited in the present application. The pole piece 2 can be installed on the first shell wall 111 first, and then the tab group 33 can be connected to the pole body 21 through the adapter 35. Alternatively, the tab group 33 can be connected to the pole body 21 through the adapter 35 first, and then the pole piece 2 can be installed on the first shell wall 111.

[0390] In the above technical solution, before the battery cell component 3 is installed in the accommodation cavity 13, the shapes of all the tab groups 33 of the battery cell group 32A are first adjusted so that all the tab groups 33 extend towards the position close to the middle of the battery cell group 32A in the first direction. This can reduce the length of the tab group 33, improve the redundancy of the tab group 33, and reduce the risk of the tab group 33 being inserted into the battery cell body 32 in reverse or being inserted into the root position of the tab group 33 connected to the battery cell body 32 in reverse. At the same time, this is also conducive to improving the problems such as wrinkling, bending and breaking of the tab sheet 331 of the tab group 33, and improving the reliability of the battery monomer 102.

[0391] In the embodiments of the present application, the execution order of each step of the processing method is not limited by the step number in the case of no conflict, that is, the step number does not constitute a limitation on the execution order of each step.

[0392] Please refer to FIGS. 37-38D. In some embodiments, the first shell wall 111 is formed with a mounting hole 112, and one end of the battery cell component 3 is connected with a conductive part 4. The conductive part 4 includes a tab part 332, or the conductive part 4 includes a tab part 332 and an adapter 35.

[0393] In step S30, the pole piece 2 is installed on the first shell wall 111, and all the tab groups 33 are connected to the pole body 21, including: in step S31, the end of the conductive part 4 away from the battery cell body 32 is inserted through the mounting hole 112 to the outside of the first shell wall 111 and connected to the pole body 21; and in step S32, the pole piece 2 connected with the conductive part 4 is covered on the mounting hole 112 from the inside or the outside of the first shell wall 111. This solution is applicable to the scenario where the adapter 35 is not provided, and is also applicable to the scenario where the adapter 35 is provided.

[0394] Exemplarily, if the above scheme is used in the scenario of setting the adapter 35, the "mounting the pole part 2 to the first shell wall 111, and connecting all the pole lug groups 33 with the pole body 21" includes: connecting the end of the adapter 35 away from the cell body 32 with the pole body 21 through the mounting hole 112 out to the outside of the first shell wall 111; covering the pole part 2 connected with the adapter 35 from the inside or the outside of the first shell wall 111 to the mounting hole 112.

[0395] It can be seen that the above scheme can be understood as that the conductive part 4 first passes through the mounting hole 112, the conductive part 4 is welded with the pole part 2 outside the mounting hole 112, and the pole part 2 is covered to the mounting hole 112 from the outside or the inside of the first shell wall 111. It can be understood that in the above scheme, when the pole part 2 covers the mounting hole 11 from the inside of the first shell wall 111, the pole part 2 can pass through the mounting hole 112 again so that the pole part 2 is located on the inside of the first shell wall 111, so as to connect the pole part 2 with the first shell wall 111.

[0396] For example, in the step S31 of connecting the end of the conductive part 4 away from the cell body 32 with the pole body 21 through the mounting hole 112 out to the outside of the first shell wall 111, the end of the conductive part 4 away from the cell body 32 is first passed out to the outside of the first shell wall 111 from the mounting hole 112, and then the conductive part 4 passed out to the outside of the first shell wall 111 is connected with the pole body 21 of the pole part 2 placed on the outside of the first shell wall 111. Thus, since the conductive part 4 has not been connected with the pole part 2 when passing through the mounting hole 112, it is convenient for the conductive part 4 to pass through the mounting hole 112, and the operation convenience is improved. Moreover, since the welding position of the pole part 2 and the conductive part 4 is located on the outside of the first shell wall 111, the problem that the conductive scrap formed in the welding process enters the inside of the shell body 11 to damage the cell part 3 can be improved.

[0397] Exemplarily, the mounting hole 112 is a long strip-shaped hole (for example, rectangular, oval, track-shaped, etc.), and the part of the conductive part 4 that needs to pass through the mounting hole 112 is a long strip-shaped part matched with the shape of the mounting hole 112. At this time, the thickness direction of the part of the conductive part 4 can be adjusted to match the width direction of the mounting hole 112, and the length direction of the part of the conductive part 4 can be made to form an angle with the length direction of the mounting hole 112. Thus, the part of the conductive part 4 can smoothly pass through the mounting hole 112, the assembly efficiency is improved, and the risk of knocking and scratching between the conductive part 4 and the shell part 1 is reduced. However, the present application is not limited to this, and the mounting hole 112 and the part of the conductive part 4 that needs to pass through the mounting hole 112 can also be machined into other shapes, such as circular, polygonal, etc.

[0398] In the above scheme, the conductive part 4 first passes through the mounting hole 112, and the conductive part 4 is connected with the pole piece 2 outside the mounting hole 112, and then the pole piece 2 connected with the conductive part 4 is covered on the mounting hole 112. This scheme is applicable to the scenario where the shell cover 12 is used as the first shell wall 111, the scenario where the shell body 11 includes the first shell wall 111, and the scenario where the tab group 33 is connected with the adapter 35 or the pole main body 21 in the form of the lamination part 312 or the tab part 332.

[0399] Referring to FIGS. 39-40D, in some embodiments, the first shell wall 111 is formed with the mounting hole 112, the pole piece 2 is mounted on the first shell wall 111 in step S30, and connecting all the tab groups 33 with the pole main body 21 includes: placing the battery cell part 3 on the inner side of the first shell wall 111, and connecting one end of the conductive part 4 away from the battery cell main body 32 with the pole main body 21 in step S33; and covering the pole piece 2 connected with the conductive part 4 on the mounting hole 112 from the inner side or the outer side of the first shell wall 111 after the pole piece 2 passes through the mounting hole 112 in step S34. This scheme is applicable to the scenario where the adapter 35 is not provided, and is also applicable to the scenario where the adapter 35 is provided.

[0400] Exemplarily, if the above scheme is used in the scenario where the adapter 35 is provided, “mounting the pole piece 2 on the first shell wall 111, and connecting all the tab groups 33 with the pole main body 21” includes: placing the battery cell part 3 on the inner side of the first shell wall 111, and connecting one end of the adapter 35 away from the battery cell main body 32 with the pole main body 21; and covering the pole piece 2 connected with the adapter 35 on the mounting hole 112 from the inner side or the outer side of the first shell wall 111 after the pole piece 2 passes through the mounting hole 112.

[0401] It can be seen that the above scheme can be understood as that the conductive part 4 is first connected with the pole piece 2, i.e., the battery cell part 3 is first connected with the pole piece 2, and then the pole piece 2 is covered on the mounting hole 11 from the outer side or the inner side of the first shell wall 111 after the pole piece 2 passes through the mounting hole 112, which also achieves the assembly of the battery cell part 3 with the pole piece 2 and the assembly of the pole piece 2 with the first shell wall 111. It can be understood that, in the above scheme, when the pole piece 2 connected with the conductive part 4 is covered on the mounting hole 11 from the inner side of the first shell wall 111, the pole piece 2 connected with the conductive part 4 can not need to pass through the mounting hole 112 and can be covered on the mounting hole 112 from the inner side of the first shell wall 111; or the pole piece 2 connected with the conductive part 4 passes through the mounting hole 112 again so that the pole piece 2 is located on the inner side of the first shell wall 111, to connect the pole piece 2 connected with the conductive part 4 with the first shell wall 111.

[0402] In the above scheme, the conductive part 4 is first connected with the pole column component 2, and then the pole column component 2 is installed on the first shell wall 111. This scheme is applicable to the scenario where the shell cover 12 serves as the first shell wall 111, the scenario where the shell body 11 includes the first shell wall 111, and the scenario where the free end 331 is connected with the adapter 35 in the form of the lamination part 312 or the form of the pole lug part 332 or is connected with the pole column body 21, as described below.

[0403] Illustratively, the pole column component 2 includes the pole column body 21 and the adapter structure 22. The installation of the pole column component 2 on the first shell wall 111 can be understood as the installation of the pole column component 2 connected with the electric core component 3 on the first shell wall 111, and specifically can include: disposing the pole column component 2 connected with the electric core component 3 at the installation hole 112, and connecting the adapter structure 22 with the first shell wall 111.

[0404] In this case, the installation of the pole column component 2 connected with the electric core component 3 at the installation hole 112 and the connection of the adapter structure 22 with the first shell wall 111 can specifically include: passing the pole column component 2 connected with the electric core component 3 from the inside of the first shell wall 111 out to the outside of the first shell wall 111 through the installation hole 112; covering the pole column component 2 passed out to the outside of the first shell wall 111 with the installation hole 112 from the outside of the first shell wall 111, so that the adapter structure 22 is abutted on the outside of the first shell wall 111; and connecting the adapter structure 22 with the first shell wall 111 from the outside of the first shell wall 111. The abutment of the adapter structure 22 on the outside of the first shell wall 111 means that part of the adapter structure 22 is supported on part of the first shell wall 111 away from the electric core body 32.

[0405] Therefore, since the electric core component 3 is first connected with the pole column component 2, and then the pole column component 2 is passed through the installation hole 112, it is not necessary to consider the avoidance of the first shell wall 111 when connecting the electric core component 3 with the pole column component 2, or in other words, the pole column component 2 and the electric core component 3 are not located on the two sides of the first shell wall 111 when connecting the electric core component 3 with the pole column component 2, thereby facilitating the further shortening of the length of the conductive part 4, the reduction of the redundancy of the conductive part 4 after assembly, the reduction of the risk of reverse insertion, and the improvement of the reliability of the battery monomer 102. Moreover, since the welding position of the pole column component 2 and the electric core component 3 is located outside the shell body 11, the problem of the conductive debris formed during the welding process entering the inside of the shell body 11 to damage the electric core component 3 can be improved. Furthermore, since the pole column component 2 is covered with the installation hole 112 from the outside of the first shell wall 111, so that the adapter structure 22 is abutted on the outside of the first shell wall 111, and the connection of the adapter structure 22 with the first shell wall 111 is performed from the outside of the first shell wall 111, the assembly and connection of the pole column component 2 with the first shell wall 111 are facilitated, and the connection reliability of the pole column component 2 with the first shell wall 111 is improved.

[0406] Referring to FIG. 7, FIG. 8 and FIG. 41, in some embodiments, the step S32 of covering the pole member 2 connected with the conductive part 4 in the installation hole 112 from the inner side or the outer side of the first shell wall 111 includes the step S30a of making the part of the conductive part 4 between the first shell wall 111 and the core body 32 in a bent shape when the pole member 2 is installed in the first shell wall 111. In some other embodiments, the step S34 of covering the pole member 2 connected with the conductive part 4 in the installation hole 112 from the inner side or the outer side of the first shell wall 111 includes the step S30a of making the part of the conductive part 4 between the first shell wall 111 and the core body 32 in a bent shape when the pole member 2 is installed in the first shell wall 111.

[0407] For example, when the conductive part 4 includes the tab group 33 and the adapter 35, the step S30a of making the part of the conductive part 4 between the first shell wall 111 and the core body 32 in a bent shape when the pole member 2 is installed in the first shell wall 111 includes making the tab group 33 and the adapter 35 connected in a bent shape.

[0408] Therefore, in any of the above cases, the conductive part 4 can play a buffering role, and when the battery monomer 102 is used in a vibrating environment, the core body 32 can be prevented from impacting the first shell wall 111, thereby protecting the core member 3 and improving the reliability of the battery monomer 102. In addition, before the pole member 2 is installed in the first shell wall 111, the part of the conductive part 4 between the first shell wall 111 and the core body 32 can be in an unfolded state, thereby facilitating the connection of the tab group 33 and the adapter 35, and / or the connection of the adapter 35 and the pole body 21, and / or the connection of the tab group 33 and the pole body 21, and providing sufficient operation space, such as facilitating the connection of the part of the adapter 35 connected with the pole body 21 on the pole body 21, and facilitating the connection of the part of the tab group 33 connected with the pole body 21 on the pole body 21.

[0409] In the above scheme, the step S30a of making the part of the conductive part 4 between the first shell wall 111 and the core body 32 in a bent shape when the pole member 2 is installed in the first shell wall 111 can include but is not limited to reshaping the part of the conductive part 4 between the first shell wall 111 and the core body 32 to make the part in a bent shape, and the reshaping manner and time are not limited, for example, the reshaping can be performed along with the covering action of the pole member 2 to the first shell wall 111, or along with the covering action of the first pole member 21a to the second pole member 21b, thereby improving the processing efficiency. Of course, the part of the conductive part 4 between the first shell wall 111 and the core body 32 can also not be reshaped when the pole member 2 is installed in the first shell wall 111, because the installation of the pole member 2 reduces the space, and the conductive part 4 is bent at a relatively weak position due to external force.

[0410] It can be understood that the part of the conductive part 4 between the first shell wall 111 and the battery cell body 32 is in a bent shape, and after the process is completed, the current state of the battery monomer 102 can be that the conductive part 4 is bent to form at least one open slot, such as the tab group 33 being bent to form at least one open slot (including the first open slot 334), and / or the adapter 35 being bent to form the second open slot 355. For example, after the above process is completed, the tab group 33 is bent to form the first open slot 334, and the adapter 35 is bent to form the second open slot 355, the conductive part 4 is generally in a reciprocating bent serpentine shape, which can simplify the above steps and 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.

[0411] Please combine FIGS. 38A-38E and FIG. 42, in some embodiments, the battery monomer 102 includes an insulating support 42 located inside the first shell wall 111, the insulating support 42 can be arranged on the side of the battery cell component 3 close to the pole component 2, the insulating support 42 has a through hole 40, and the tab group 33 is arranged through the through hole 91; step S30a, when the pole component 2 is installed on the first shell wall 111, the part of the conductive part 4 between the first shell wall 111 and the battery cell body 32 is in a bent shape, including: step S301, when the pole component 2 is installed on the first shell wall 111, the part of the conductive part 4 between the first shell wall 111 and the battery cell body 32 is bent to form at least one open slot; step S302, part of the insulating support 42 is inserted into the at least one open slot, so that the insulating support 42 can prevent the conductive part 4 from moving towards the battery cell body 32.

[0412] Exemplarily, the step of bending the part of the conductive part 4 between the first shell wall 111 and the battery cell body 32 after the tab group 33 and the adapter 35 are connected includes: bending the part of the conductive part 4 between the first shell wall 111 and the battery cell body 32 after the tab group 33 and the adapter 35 are connected to form the first open slot 334 or the second open slot 355, the free end 331 defines at least part of the side slot wall of the first open slot 334 close to the pole body 21, and the adapter 35 forms the second open slot 355; part of the insulating support 42 is inserted into the first open slot 334 and / or the second open slot 355, so that the insulating support 42 can prevent the conductive part 4 from moving towards the battery cell body 32.

[0413] Exemplarily, the step of bending the part of the conductive part 4 between the first shell wall 111 and the battery cell body 32 after the tab group 33 and the adapter 35 are connected includes: bending the part of the conductive part 4 between the first shell wall 111 and the battery cell body 32 after the tab group 33 and the adapter 35 are connected to form the first open slot 334 or the second open slot 355, the free end 331 defines at least part of the side slot wall of the first open slot 334 close to the pole body 21, and the adapter 35 forms the second open slot 355; part of the insulating support 42 is inserted into the first open slot 334 and / or the second open slot 355, so that the insulating support 42 can prevent the conductive part 4 from moving towards the battery cell body 32.

[0414] Referring to FIGS. 40C, 40D and 43, in some embodiments, the battery cell 102 includes an insulating support 42 inside the first shell wall 111; the conductive part 4 includes the adapter 35 and at least one tab part 332; the step S30a of bending the part of the conductive part 4 between the first shell wall 111 and the cell body 32 when the pole part 2 is installed on the first shell wall 111 includes: the step S303 of bending the part of the tab group 33 and the adapter 35 after being connected to the first shell wall 111 and the cell body 32 to form a first opening slot 334 and a second opening slot 355, the second opening slot 355 is adjacent to the first opening slot 334 and located on the side of the first opening slot 334 facing the pole body 21, the openings of the second opening slot 355 and the first opening slot 334 are arranged at an angle; the step S304 of inserting a part of the insulating support 42 into at least one of the first opening slot 334 and the second opening slot 355 so that the insulating support 42 can prevent the tab group 33 and / or the adapter 35 from moving towards the cell body 32.

[0415] Exemplarily, in the state that the conductive part 4 connected to the cell body 32 is inside the insulating support 42, and the pole part 2 connected to the conductive part 4 is outside the first shell wall 111, “bending the part of the conductive part 4 between the pole part 2 and the cell body 32 to form the first opening slot 334 and the second opening slot 355 with opposite opening directions” can specifically include: with the action of covering the pole part 2 towards the first shell wall 111, the conductive part 4 forms two opening slots 42 with opposite opening directions inside and outside the insulating support 42, that is, the conductive part 4 forms an opening slot (i.e. the first opening slot 421) inside the insulating support 42, and the conductive part 4 forms another opening slot (i.e. the second opening slot 422) outside the insulating support 42. Thus, by providing the insulating support 42, it is convenient to bend the conductive part 4 to form the first opening slot 334 and the second opening slot 355 with opposite opening directions, and the processing difficulty is reduced.

[0416] Please refer to FIG. 45, in some embodiments, the step of connecting the end of the conductive part 4 away from the cell body 32 with the pole body 21 in step S31 and / or step S33 includes: step S30b, adjusting the angle of the pole part 2 so that the normal of the inner end face 211 of the pole body 21 is close to the stacking direction of the plurality of cell bodies 32. The step of covering the pole part 2 connected with the conductive part 4 on the mounting hole 112 in step S32 and / or step S34 includes: step S30c, adjusting the angle of the pole part 2 on the outside of the first shell wall 111 so that the normal of the inner end face 211 of the pole body 21 is close to perpendicular to the stacking direction (for example, the fourth direction F4) of the plurality of cell bodies 32, and the conductive part 4 is deformed to form at least one open slot. This scheme is applicable to the scenario where the conductive part 4 includes at least one tab group 33, and is also applicable to the scenario where the conductive part 4 includes an adapter 35 and at least one tab group 33.

[0417] In this embodiment, the stacking step of the plurality of cell bodies 32 can be performed before connecting the conductive part 4 with the pole part 2, or after connecting the conductive part 4 with the pole part 2.

[0418] Wherein "the normal of the inner end face 211 of the pole body 21 is close to the stacking direction of the plurality of cell bodies 32" means that the normal of the inner end face 211 of the pole body 21 is consistent or generally consistent with the stacking direction of the plurality of cell bodies 32. Generally consistent can be understood as a small included angle between the two, for example, less than 10°. Wherein "the pole part 2 is arranged on the side of the cell part 3 extending the tab group 33" can be understood as: the tab group 33 is located on one side of the cell body 32, and the pole part 2 and the tab group 33 are arranged on the same side of the cell body 32, thereby facilitating the shortening of the length of the tab part 33. In the above technical scheme, "the length of the tab part 33" makes the pole part 2 present that the normal of the inner end face 211 of the pole body 21 is close to the stacking direction of the plurality of cell assemblies 31, the pole part 2 can be located on the side of the cell part 3 extending the tab part 33, and the adapter 35 can be laid on the inner end face 211 of the pole body 21.

[0419] In the above technical solution, the position and angle of the pole post component 2 are first adjusted so that the normal of the inner end face 211 of the pole post body 21 approaches the stacking direction of the plurality of battery cell assemblies 31, then the part of the conductive part 4 connected to the pole post body 21 is laid on the inner end face 211 of the pole post body 21, and thereafter, without further adjusting the angle of the pole post body 21, there is sufficient space near the matching position of the part of the conductive part 4 connected to the pole post body 21 and the inner end face 211 of the pole post body 21 for the welding operation of the conductive part 4 and the pole post body 21, thereby simplifying the operation and making the length of the tab part 33 shorter.

[0420] In the above technical solution, the conductive part 4 is bent to form at least one open slot, when the conductive part 4 includes the tab group 33, the tab group 33 is bent to form at least one open slot; when the conductive part 4 includes the tab group 33 and the adapter 35, the tab group 33 is bent to form at least one open slot, and / or the adapter 35 is bent to form at least one open slot.

[0421] Please refer to FIG. 46, in some embodiments, one end of the battery cell body 32 is connected with the conductive part 4, the conductive part 4 includes the tab group 33 and the adapter 35; the step S30c specifically includes the step S30d, when the pole post component 2 is installed on the first shell wall 111, the tab group 33 and the adapter 35 are connected, the tab 33 is bent to form the first open slot 334, and the adapter 35 extends into the first open slot 334, and the tab 332 is formed as the slot wall of the first open slot 334 facing the pole post component 2, the adapter 35 can be used to prevent the tab 332 from moving towards the battery cell body 21, thereby reducing the risk of short circuit caused by the tab group 332 being inserted into the battery cell body 21 in reverse.

[0422] Therefore, by indirectly connecting the tab group 33 and the pole post body 21 through the adapter 35 to form an electrical conduction, the length of the tab group 33 can be shortened, the redundancy of the tab group 33 can be improved, and the problems such as wrinkling and bending fracture of the tab sheet 311 of the tab group 33 can be improved, and at the same time, due to the shorter length of the tab group 33 and the certain restriction of the adapter 35 on the tab group 33, the risk of short circuit caused by the tab group 33 being inserted into the battery cell body 32 in reverse can be reduced, and by flexibly designing the shape and material of the adapter 35, the connection difficulty of the adapter 35 and the pole post body 21 can be reduced, the connection difficulty of the adapter 35 and the tab group 33 can be reduced, and the assembly convenience of the battery monomer 102 can be improved.

[0423] Furthermore, the adapter 35 supports the tab part 332 of the tab group 33, for example, a part of the adapter 35 can be supported on the side of the tab part 332 of the tab group 33 facing the cell body 32, or a part of the adapter 35 can be supported on the side of the tab part 332 of the tab group 33 away from the inner end face 211 of the pole body 21, so that the tab part 332 of the tab group 33 is located between the part of the adapter 35 supporting the tab part 332 and the inner end face 211 of the pole body 21. The above supporting arrangement of the adapter 35 can prevent the tab part 332 from moving towards the cell body 32, for example, when the tab group 33 is subjected to an external force so that the tab group 33 has a tendency to move towards the cell body 32, the adapter 35 can exert a counterforce on the tab part 332 to hinder the tendency of the tab group 33 to move towards the cell body 32, thereby reducing the risk of the tab group 33 moving towards the cell body 32 to cause a short circuit due to the inverted insertion of the cell body 32, and facilitating the improvement of the reliability of the battery monomer 102.

[0424] It can be understood that in the step of "installing the pole part 2 on the first shell wall 111, connecting the tab group 33 and the adapter 35, and then bending the tab group 33 to form the first open slot 334, and the adapter 35 extends into the first open slot 334", the tab group 33 is first connected to the pole body 21 through the adapter 35, and then the pole part 2 is installed on the first shell wall 111. In the step of "connecting the cell part 3 and the pole part 2, and then installing the pole part 2 connected with the cell part 3 on the first shell wall 111", the cell part 3 is first connected to the pole part 2, and then the pole part 2 connected with the cell part 3 is installed on the first shell wall 111. Since the pole part 2 has various forms, it can be in the form of a whole piece of incoming material that cannot be disassembled, or it can be in the form of multiple parts assembled after the incoming material. At this time, "installing the pole part 2 connected with the cell part 3 on the first shell wall 111" is understood in a broad sense, that is, the part connecting the pole part 2 and the cell part 3 can be assembled on the first shell wall 111.

[0425] For example, when the pole part 2 does not need to be assembled, "connecting the cell part 3 and the pole part 2, and then installing the pole part 2 connected with the cell part 3 on the first shell wall 111" can be specifically "first connecting the pole part 2 and the cell part 3, and then installing the pole part 2 on the first shell wall 111 (for example, covering the pole part 2 on the first shell wall 111 at the installation hole 112, and then connecting the pole part 2 and the first shell wall 111, such as welding, riveting, or bonding)".

[0426] For example, when the pole part 2 needs to be assembled, "connecting the cell part 3 and the pole part 2, and then installing the pole part 2 connected with the cell part 3 on the first shell wall 111" can also be "first connecting a part (for example, a first pole part) of the pole part 2 with the cell part 3, and connecting the remaining part (for example, a second pole part) of the pole part 2 with the first shell wall 111, and then combining the two parts of the pole part 2".

[0427] Since the connection of the cell component 3 and the pole column component 2 is completed first, and then the assembly connection of the pole column component 2 and the shell component 1 is completed, rather than the pre-assembly of the pole column component and the shell component first, and then the connection of the cell component and the pole column component, it is beneficial to shorten the length of the conductive part 4 connecting the pole column component 2 and the cell component 3, reduce the redundancy of the conductive part 4 in the shell component 1, reduce the space occupation of the conductive part 4 in the shell component 1, improve the energy density of the battery monomer 102, and reduce the risk of the conductive part 4 being inserted into the cell body 32 of the cell component 3 and causing short circuit, thereby improving the reliability of the battery monomer 102. In addition, this assembly method can realize the assembly of the battery monomer 102 whether the pole column component 2 is arranged on the shell body 11 or the shell cover 12, so that the installation position of the pole column component 2 on the shell component 1 can be flexibly selected. When the pole column component 2 is arranged on the shell body 11, it is beneficial to reduce the cracking problem at the connection between the shell body 11 and the shell cover 12, and improve the reliability of the battery monomer 102.

[0428] Please refer to FIG. 47. In some embodiments, step S30d specifically includes step S30e: when the pole column component 2 is installed on the first shell wall 111, the adapter 35 is bent to form a second opening groove 355, which is adjacent to the first opening groove 334 and located on the side of the first opening groove 334 facing the pole column body 21. The openings of the second opening groove 355 and the first opening groove 334 are arranged at an included angle, and at least part of the groove wall of the second opening groove 334 facing the cell body 21 extends into the first opening groove 334 to improve the supporting reliability of the adapter 35 to the tab group 33. Moreover, at least part of the conductive part 4 can form a serpentine shape to play a buffering and supporting role.

[0429] Please refer to FIG. 48. In some embodiments, the cell body 32 has a conductive part 4 connected at one end, and the conductive part 4 includes a tab group 33 and an adapter 35, and the tab group 33 includes a plurality of tab pieces 331. Step S10: extending all the tab groups 33 of the cell group 32A towards the middle position of the cell group 32A in the first direction includes: step S11: converging the plurality of tab pieces 331 towards the middle position to form a laminated part 312 at the free end 331; and step S12: connecting the laminated part 312 with the adapter 35. The laminated part 312 refers to the plurality of tab pieces 311 converging at the free end 331 without being connected, so as to reshape the tab group 33 and facilitate the subsequent connection with the adapter 35.

[0430] Please refer to FIG. 49, in some embodiments, the step S12 of connecting the lamination part 312 with the adapter 35 includes: the step S121 of connecting the plurality of tab pieces 311 of the tab group 33 at the position of the lamination part 312 to form a tab part 332; and the step S122 of connecting at least part of the tab part 332 with the adapter 35. It can be seen that the lamination part 312 is first pre-connected to form the tab part 332 with a certain rigidity, instead of a loose and scattered multi-layer foil form, so as to facilitate the connection of the tab part 332 with the adapter 35, and make the welding of the tab part 33 with the adapter 35 more reliable, and it is not easy to form pores in the welding seam, so as to improve the connection reliability and conductive capacity of the welding position, and make the conduction of the battery component 3 with the pole component 2 more stable and reliable. Among them, the plurality of tab pieces 311 in the tab part 332 are electrically conductive, that is, the plurality of tab pieces 311 in the tab part 332 not only have a stacked arrangement, but also have a connection and conductive relationship.

[0431] In some embodiments, the step S12 of connecting the lamination part 312 with the adapter 35 includes: directly connecting at least part of the lamination part 312 with the adapter 35. It can be seen that the lamination part 312 can also be directly connected with the adapter 35 without pre-connection, which is beneficial to simplify the processing procedure and improve the processing efficiency. At the same time of connecting the lamination part 312 with the adapter 35, the lamination part 312 forms the tab part 332, and the reliable connection of the lamination part 312 with the adapter 35 can also be achieved.

[0432] In some examples, whether the tab part 332 is connected with the adapter 35 or the lamination part 312 is connected with the adapter 35, the connection position can be such that after the pole component 2 is installed on the first shell wall 111, at least part of the tab part 332 is connected on the side of a part of the adapter 35 away from the battery main body 32, so that the adapter 35 supports the tab group 332, and the adapter 35 can prevent the tab part 332 from moving towards the battery main body 32.

[0433] In the above scheme, when the battery main body 32 is one, all the tab pieces 311 of the battery main body 32 converge to form the lamination part 312 at the free end 331; when a plurality of battery main bodies 32 constitute a battery group 32A, and the battery group 32A is one group, the tab pieces 311 of the battery group 32A converge to form the lamination part 312 at the free end 331; and when the battery group 32A is a plurality of groups, the tab pieces 311 of each battery group 32A converge to form the lamination part 312 at the free end 331. At this time, the lamination part 312 can be a plurality of lamination parts 312, each of which is connected with the adapter 35, or each of which forms the tab part 332 and then is connected with the adapter 35.

[0434] In the above scheme, if the plurality of battery bodies 32 are connected, the plurality of battery bodies 32 are stacked before the connection of the tab blocking part 3 and the adapter 35, and the tab pieces 311 of the same polarity of the plurality of battery bodies 32 in the same battery group 32A are gathered together to form the lamination part 312. Compared with the technical scheme of separately gathering the tab pieces 311 of each battery body 32 to form the lamination part 312, and separately connecting the lamination part 312 of each battery assembly 31 to the adapter 35, and then stacking the plurality of battery bodies 32, on the one hand, the total number of the lamination part 312 and the adapter 35 can be reduced, the connection steps of the lamination part 312 and the adapter 35 can be reduced, and the processing efficiency can be improved. On the other hand, when the lamination part 312 and the adapter 35 are connected first and then the battery bodies 32 are stacked, the movement of the tab pieces 311 of different battery bodies 32 is not synchronized, which causes tensile stress between the tab groups 33 and the battery bodies 32, and causes cracking at the connection position of the tab groups 33 and the battery bodies 32.

[0435] It can be understood that the free end 331 is connected to the adapter 35 in the form of the lamination part 312 or the tab part 332, and 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 of the free end 331 and the adapter 35.

[0436] In the above scheme, whether the battery body 32 is one or more, and whether the free end 331 is connected to the adapter 35 in the form of the lamination part 312 or the tab part 332, is suitable for the scenario that the shell cover 12 is the first shell wall 111, and is suitable for the scenario that the shell body 11 includes the first shell wall 111.

[0437] Please refer to FIG. 50, 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 oppositely arranged clamping parts 3561; at this time, the step S12 of connecting the lamination part 332 and the adapter 35 includes: the step S124 of clamping the free end 331 from both sides of the free end 331 by the two clamping parts 3561; and the step S125 of connecting the two clamping parts 3561 to the free end 331.

[0438] It can be understood that the free end 331 can cooperate with the clamping structure 356 in the form of the lamination part 312, or in the form of the tab part 332. Therefore, the two clamping parts 3561 can protect the free end 331 to improve the problem that the free end 331 is prone to cracking during the connection with the clamping structure 356, and improve the connection reliability of the adapter 35 and the tab group 33.

[0439] Exemplarily, before the clamping structure 356 is matched with the free end 331, the two clamping portions 3561 are first opened, for example, one of the clamping portions 3561 is flipped towards the direction away from the other clamping portion 3561, so as to increase the included angle between the two clamping portions 3561, facilitating the quick matching of the free end 331 between the two clamping portions 3561; then the free end 331 is matched between the two clamping portions 3561, the included angle between the two clamping portions 3561 is reduced, 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 with the free end 331.

[0440] Please refer to FIG. 51. In some embodiments, the adapter 35 includes a plurality of adapter foils 350. At this time, before the step S12 of connecting the laminated foil portion 312 with the adapter 35, the processing method further includes: a step S10a of layering the plurality of adapter foils 350; and a step S10b of connecting the layered partial regions to form a first connecting portion 351, so as to realize the connection of the plurality of adapter foils 350 and improve the compactness of the adapter foils 350 at the first connecting portion 351, facilitating the connection of the adapter 35 with the pole piece component 2. The step S12 of connecting the laminated foil portion 312 with the adapter 35 includes: a step S126 of connecting the layered partial regions of the plurality of adapter foils 350 with the free end 331, so that the layered partial regions form a second connecting portion 352 spaced apart from the first connecting portion 351; and a step S127 of connecting the first connecting portion 351 with the pole body 21.

[0441] It can be seen that in the above scheme, the “connection of the plurality of adapter foils 350 with the free end 331” and the “connection of the layered partial regions of the plurality of adapter foils 350 to form the second connecting portion 351” can be performed simultaneously, which is beneficial to simplify the processing procedure. The sequence of the “formation of the second connecting portion 352” (the connection of the layered partial regions of the plurality of adapter foils 350 with the free end 331, so that the layered partial regions form the second connecting portion 352 spaced apart from the first connecting portion 351) and the “connection of the first connecting portion 351 with the pole body 21” is not specifically limited.

[0442] Of course, in other embodiments of the present application, when the adapter 35 includes a plurality of adapter foils 350, the step of connecting one end of the adapter 35 with the tab group 33 and the other end with the pole body 21 can also be configured to include: connecting the layered partial regions of the plurality of adapter foils 350 to form a second connecting portion 352, and then connecting the second connecting portion 352 with the free end 331; that is, the “connection of the plurality of adapter foils 350 with the free end 331” and the “connection of the layered partial regions of the plurality of adapter foils 350 to form the second connecting portion 351” are separately performed in sequence.

[0443] It can be understood that, in the above scheme, no matter whether the layered partial region of the plurality of adapter foils 350 is connected with the free end 331 to form the second connecting portion 352 spaced apart from the first connecting portion 351, or the second connecting portion 352 is formed first and then connected with the free end 331, the free end 331 can be connected in the form of the laminated portion 312, or the free end 331 can also be connected in the form of the tab portion 332.

[0444] Please refer to Fig. 52 again, in some embodiments, the shell component 1 comprises a shell body 11 and a shell cover 12, the shell body 11 has an opening 113; when the end wall opposite to the opening 113 of the shell body 11 is the first shell wall 111, the step S20 of loading the battery cell component 3 into the accommodating cavity 13 and arranging the battery cell component 3 with one end of the tab group 33 on the inner side of the first shell wall 111 and opposite to the first shell wall 111 comprises: the step S21 of loading the battery cell component 3 into the accommodating cavity 13 from the opening 113; the step S22 of extending the tab group 33 out of the mounting hole 113 to arrange the battery cell component 3 with one end of the tab group 33 on the inner side of the first shell wall 111 and opposite to the first shell wall 111; and the step S23 of covering the shell cover 12 on the opening 113.

[0445] In the above scheme, the step of “loading the battery cell component 3 into the accommodating cavity 13 and arranging the battery cell component 3 on the inner side of the first shell wall 111 and opposite to the first shell wall 111” can comprise: adjusting the relative positions of the shell body 11, the battery cell component 3 and the conductive part 4 to arrange the battery cell component 3 on the side of the adapter 35 connected with the battery cell component 3 away from the shell body 11, and the opening 113 of the shell body 11 faces the adapter 35, and then loading the battery cell component 3 and the adapter 35 into the shell body 11 from the opening 113. The sequence of the step of “loading the battery cell component 3 into the accommodating cavity 13 from the opening 113” and the step of “extending the tab group 33 out of the mounting hole 113 to arrange the battery cell component 3 with one end of the tab group 33 on the inner side of the first shell wall 111 and opposite to the first shell wall 111” is not limited, for example, the two steps can be performed simultaneously.

[0446] Therefore, by arranging the pole component 2 on the end of the shell body 11 opposite to the opening 113, the cracking problem of the connection between the shell body 11 and the shell cover 12 is improved, and the reliability of the battery monomer 102 is improved. The step of “adjusting the relative positions of the shell body 11, the battery cell component 3 and the conductive part 4” can be achieved by adjusting the position of the shell body 11, or by adjusting the positions of the battery cell component and the conductive part; the step of “loading the battery cell component 3 and the adapter 35 into the shell body 11 from the opening 113” can be achieved by pushing the battery cell component, or by sleeving the shell body.

[0447] Exemplarily, the action of the adapter 35 passing through the mounting hole 112 to the outside of the first shell wall 111 can be achieved by the action of the battery cell component 3 entering the shell body 11. That is, the action of the adapter 35 passing through the mounting hole 112 is achieved by the action of the battery cell component 3 entering the shell body 11, so that the operation is convenient and the processing efficiency is improved.

[0448] Exemplarily, when assembling the battery cell 102, the tab group 33 can be connected with the adapter 35 to form the conductive part 4, then the battery cell component 3 is assembled into the shell body 11 according to the direction of the conductive part 4 relative to the battery cell body 32 towards the mounting hole 112, the conductive part 4 passes out to the outside of the mounting hole 112 by the movement of the battery cell component 3 entering the shell body 11, the conductive part 4 is connected with the pole column component 2 placed outside the first shell wall 111 outside the first shell wall 111, then the pole column component 2 connected with the conductive part 4 is covered on the mounting hole 112 from the outside of the first shell wall 111, and then the pole column component 2 covered on the mounting hole 112 is connected with the first shell wall 111.

[0449] Please refer to FIG. 53, in some embodiments, the shell component 1 includes the shell body 11 and the shell cover 12, the shell body 11 has an opening 113; when the shell cover 12 is the first shell wall 111, the step S20 of assembling the battery cell component 3 into the accommodating cavity 13 and arranging one end of the tab group 33 of the battery cell component 3 on the inside of the first shell wall 111 and opposite to the first shell wall 111 includes: the step S24 of supporting the battery cell component 3 on the inside of the shell cover 12; the step S25 of extending the tab group 33 from the mounting hole 112 to arrange one end of the tab group 33 of the battery cell component 3 on the inside of the first shell wall 111 and opposite to the first shell wall 111; and the step S26 of covering the shell body 11 on the outside of the battery cell component 3 and connecting the shell body 11 with the shell cover 12.

[0450] For example, the step of connecting the adapter 35 passing out to the outside of the first shell wall 111 with the pole column body 21 of the pole column component 2 placed outside the first shell wall 111 can be performed after the step of connecting the shell body 11 with the shell cover 12; or in other embodiments of the present application, the step of connecting the conductive part 4 passing out to the outside of the first shell wall 111 with the pole column body 21 of the pole column component 2 placed outside the first shell wall 111 can also be performed before the step of covering the shell body 11 on the outside of the battery cell component 3.

[0451] Therefore, by connecting the shell body 11 with the shell cover 12 first and then connecting the pole column component 2 with the shell cover 12, the shell body 11 can be used to accommodate the battery cell component 3 and support the shell cover 12, which is convenient for positioning and supporting the shell cover 12, facilitating the connection of the shell cover 12 with the adapter structure 22 and improving the connection reliability of the shell cover 12 with the pole column component 2. The connection mode of the shell body 11 with the shell cover 12 is not limited, for example, can be welding, bonding, etc.

[0452] Exemplarily, the connecting of the adapter 35 with the pole body 21 outside the first shell wall 111 can be performed before the sleeving of the shell body 11 on the outer side of the battery cell component 3.

[0453] Thus, the connection of the shell body 11 and the shell cover 12 is completed first, and then the connection of the pole component 2 with the shell cover 12 is performed, so that the battery cell component 3 can be accommodated by the shell body 11 and the shell cover 12 can be supported, which facilitates the positioning and supporting of the shell cover 12, facilitates the connection of the shell cover 12 with the adapter structure 22, and improves the connection reliability of the shell cover 12 with the pole component 2.

[0454] Referring to FIG. 49, in some embodiments, when the end wall opposite to the opening 113 is the first shell wall 111, before the battery cell component 3 is loaded into the accommodating cavity 13 from the opening in step S21, the processing method further includes step S27 of wrapping the insulating film 41 on the outer side of the battery cell body 32. Thus, the battery cell component 3 and the insulating film 41 are loaded into the shell together, which facilitates the arrangement of the insulating film 41 and facilitates the insulation arrangement of the battery cell component 3 with the shell component 1.

[0455] Referring to FIG. 54, in some embodiments, when the shell cover 12 is the first shell wall 111, before the shell body 11 is sleeved on the outer side of the battery cell component 3 in step S26, the processing method further includes step S28 of wrapping the insulating film 41 on the outer side of the battery cell body 32. Thus, the battery cell component 3 and the insulating film 41 can also be loaded into the shell together with the shell body 11, which facilitates the arrangement of the insulating film 41 and facilitates the insulation arrangement of the battery cell component 3 with the shell component 1.

[0456] It can be understood that when the shell cover 12 is the first shell wall 111, the sequence of “supporting the battery cell component 3 on the inner side of the shell cover 12” and “extending the tab group 33 from the mounting hole 112 so that one end of the battery cell component 3 provided with the tab group 33 is arranged on the inner side of the first shell wall 111 opposite to the first shell wall 111” and “wrapping the insulating film 41 on the outer side of the battery cell body 32” is not specifically limited, as long as the insulating film 41 is wrapped before the shell body 11 is sleeved on the outer side of the battery cell component 3.

[0457] Exemplarily, please refer to FIG. 55A-55F again, in some embodiments of the present application, when the shell cover 12 is the first shell wall 111, the inner side of the shell cover 12 can have an insulating support 42, before the shell body 11 is sleeved on the battery cell component 3, the battery cell component 3 is placed with the conductive part 4 connected thereto facing downward, and the shell cover 12 is placed with the insulating support 42 facing upward; the insulating film 41 is wrapped outside the battery cell component 3 supported on the top of the insulating support 42, and the insulating film 41 is connected with the insulating support 42. At this time, the step of "sleeving the shell body 11 on the battery cell component 3" specifically includes: "placing the shell body 11 with the opening 113 facing downward, and sleeving the shell body 11 on the battery cell component 3 wrapped with the insulating film 41 from top to bottom".

[0458] Wherein, the step of "placing the battery cell component 3 with the conductive part 4 connected thereto facing downward, and placing the shell cover 12 with the insulating support 42 facing upward" can be performed before "the other end of the adapter 35 passes through the mounting hole 112 to the outside of the first shell wall 111", or also can be performed after "the other end of the adapter 35 passes through the mounting hole 112 to the outside of the first shell wall 111".

[0459] Wherein, the step of "wrapping the insulating film 41 outside the battery cell component 3 supported on the top of the insulating support 42, and connecting the insulating film 41 with the insulating support 42" is performed in the state that the insulating support 42 is supported on the bottom of the battery cell body 32, and the adapter 35 passes through the mounting hole 112 to the outside of the first shell wall 111. Because in this state, the battery cell component 3 does not need to be supported and limited by other clamps, it is beneficial to fast operation.

[0460] In the above technical solution, when the shell cover 12 is the first shell wall 111, in the process of sleeving the shell body 11 on the battery cell component 3, since the shell cover 12 is not connected with the battery cell component 3, by setting the insulating support 42 on the inner side of the shell cover 12 (i.e. the side away from the battery cell body 32), the battery cell component 3 is supported from the bottom of the battery cell component 3, so that the problem of separation of the battery cell component 3 and the shell cover 2 can be avoided without other limiting clamps, so that the shell body 11 can be directly sleeved from top to bottom during assembly, thereby the assembly process can be simplified, and the use of limiting clamps and the like can be reduced.

[0461] Please refer to FIG. 55A-55F again, in some embodiments of the present application, when the shell cover 12 is the first shell wall 111, during the assembly of the battery monomer 102, the following steps can be sequentially performed: "placing the battery cell component 3 with the conductive part 4 connected thereto downward, and placing the shell cover 12 with the insulating support 42 upward"; "placing the battery cell component 3 and the conductive part 4 connected to the battery cell component 3 inside the first shell wall 111, and passing the conductive part 4 out of the first shell wall 111 through the mounting hole 112"; "wrapping the insulating film 41 around the battery cell component 3 supported on the top of the insulating support 42, so that the insulating film 41 is connected with the insulating support 42"; "placing the shell body 11 with the opening 113 downward, and then placing the shell body 11 around the battery cell component 3 wrapped with the insulating film 41 from top to bottom"; "connecting the shell body 11 with the shell cover 12"; "connecting the conductive part 4 passed out of the first shell wall 111 with the pole component 2 with the pole body 21 placed outside the first shell wall 111"; "covering the pole component 2 connected with the conductive part 4 outside the first shell wall 111 with the mounting hole 112, so that the adapter structure 22 is stopped on the outside of the first shell wall 111"; "connecting the adapter structure 22 with the first shell wall 111 from the outside of the first shell wall 111".

[0462] Exemplarily, please refer to FIG. 55A-55F again, during the assembly of the battery monomer 102, a plurality of electrode assemblies 31 are stacked along the thickness direction (for example, the fourth direction F4) of the electrode assembly 31, the plurality of electrode assemblies 31 are bundled by the binder 8 (such as blue glue), the plurality of electrode assemblies 31 are stacked with the plurality of layers of the tab sheet 311 of the same polarity, and the plurality of layers of the tab sheet 311 are gathered to form the lamination part 312, the lamination part 312 is clamped between the two clamping parts 4110 of the adapter 35, and the lamination part 312 and the clamping part 4110 are welded, so as to obtain the conductive part 4 combined by the tab part 33 and the adapter 35, the shell cover 12 is placed below the cell body 32, and the shell cover 12 is placed with the insulating support 42 upward, the cell body 32 is supported above the insulating support 42, and then the insulating film 41 is wrapped around the cell body 32, and the lower end of the insulating film 41 is hot-melt connected with the insulating support 42; then, the shell body 11 is placed with the opening 113 downward, and the shell body 11 is placed around the cell body 32 from top to bottom, and the lower end of the shell body 11 is welded with the shell cover 12. After that, the shell body 11 is placed horizontally, the mounting hole 112 is open to the horizontal direction, the conductive part 4 is connected with the pole component 2 placed outside the shell cover 12 outside the shell cover 12, and then the pole component 2 connected with the conductive part 4 is covered on the mounting hole 112 outside the shell cover 12; after that, the shell body 11 is turned over, so that the shell cover 12 is located above the shell body 11, the pole component 2 is located on the top of the shell cover 12, and the adapter structure 22 is welded and fixed with the shell cover 12.

[0463] In addition, in the embodiments of the present application, the connection of the cell component 3 and the pole component 2 is completed first, and then the assembly connection of the pole component 2 and the shell component 1 is completed, instead of first completing the pre-assembly of the pole component and the shell component, and then connecting the cell component and the pole component. In this way, the length of the conductive part 4 connecting the pole component 2 and the cell component 3 can be shortened, the redundancy of the conductive part 4 in the shell component 1 can be reduced, the space occupation of the conductive part 4 in the shell component 1 can be reduced, the energy density of the battery monomer 102 can be improved, and the risk of the conductive part 4 being inserted into the cell body 32 of the cell component 3 and causing a short circuit can be reduced, thereby improving the reliability of the battery monomer 102. In addition, this assembly method can realize the assembly of the battery monomer 102 whether the pole component 2 is arranged on the shell body 11 or the shell cover 12, so that the installation position of the pole component 2 on the shell component 1 can be flexibly selected. When the pole component 2 is arranged on the shell body 11, the cracking problem at the connection between the shell body 11 and the shell cover 12 can be reduced, and the reliability of the battery monomer 102 can be improved.

[0464] When the end wall opposite to the opening 113 of the shell body 11 is used as the first shell wall 111, it is difficult to connect the cell component and the pole component if the pole component is first installed on the first shell wall and then the cell component is assembled into the shell body. In the embodiments of the present application, the connection of the cell component 3 and the pole component 2 is first completed, and then the connection of the pole component 2 and the shell component 1 is completed, so that the connection requirements of the cell component 3 and the pole component 2 can be met, and the connection requirements of the pole component 2 and the shell component 1 can also be met. When the battery 100 vibrates or deforms, the pole components 2 connected by the busbar component will pull each other. Since the pole component 2 is arranged on the first shell wall 111 opposite to the opening 113 of the shell body 11, the force acting on the pole component 2 will be preferentially transmitted to the shell body 11, and will not directly act on the shell cover 12. Therefore, not only can the distance of the force transmission to the connection (such as the welding seam) between the shell body 11 and the shell cover 12 be prolonged, but also the shell body 11 will deform preferentially when subjected to stress, so as to reduce the stress at the connection between the shell body 11 and the shell cover 12, thereby effectively reducing the probability of cracking at the connection between the shell cover 12 and the shell body 11 during use of the battery 100, and improving the reliability of the battery monomer 102. In addition, since the connection between the shell body 11 and the shell cover 12 is not prone to cracking, the thickness of the shell body 11 and the shell cover 12 does not need to be increased to increase the connection reliability, thereby reducing the weight and material cost.

[0465] When the shell cover 12 is the first shell wall 111, if the pole part is first installed on the shell cover and then connected with the battery cell part, when the pole part is connected with the battery cell part, the length of the conductive part needs to be relatively long (for example, greater than half of the width of the shell cover) so that the battery cell part can be located on one side of the width direction of the shell cover. In this way, the length of the conductive part is relatively long, and after assembly, the conductive part has more redundancy, and the risk of inserting into the active material coating part and causing short circuit is easy to occur. In the embodiment of the present application, the pole part 2 is first connected with the battery cell part 3, and then the pole part 2 is installed on the shell cover 12. Therefore, when the pole part 2 is connected with the battery cell part 3, the length of the conductive part 4 is sufficient to enable the battery cell part 3 to be located on one side of the width direction of the pole part 2. Therefore, the length of the conductive part 4 is shortened (for example, greater than half of the width of the pole part 2), the redundancy of the conductive part 4 after assembly is reduced, the risk of inserting the conductive part 4 into the battery cell body 32 and causing short circuit is reduced, the reliability of the battery monomer 102 is improved, and the material and cost of the conductive part 4 can be reduced.

[0466] It can be seen that the above arrangement of the embodiment of the present application enables the assembly position of the pole part 2 on the shell part 1 to be not limited, that is, the pole part 2 can be arranged on the shell body 11 or the shell cover 12, and the installation position of the pole part 2 on the shell part 1 can be flexibly selected, which is beneficial to meet the production needs of different types of battery monomers 102. When the pole part 2 is arranged on the shell body 11, the cracking problem at the connection between the shell body 11 and the shell cover 12 is improved, and the reliability of the battery monomer 102 is improved. When the pole part 2 is arranged on the shell cover 12, the length of the conductive part 4 is shortened, the redundancy of the conductive part 4 after assembly is reduced, the risk of insertion is reduced, and the reliability of the battery monomer 102 is improved.

[0467] In a third aspect, the embodiment of the present application provides a battery 100 comprising the above-mentioned battery monomer 102. It should be noted that the battery 100 according to the embodiment of the present application can include a box body 101 or can not include a box body 101. Since the reliability of the battery monomer 102 according to the embodiment of the present application is improved, the performance of the battery 100 is improved.

[0468] For example, when a plurality of battery monomers 102 are connected in series, the pole part 2 of the positive electrode of one battery monomer 102 is connected with the pole part 2 of the negative electrode of the next battery monomer 102 through a busbar part, and at the same time, the pole part 2 of the negative electrode of the battery monomer 102 is connected with the pole part 2 of the positive electrode of the previous battery monomer 102 through another busbar part.

[0469] Exemplarily, in combination with FIG. 2, the battery 100 includes a box body 101, the battery cells 102 are multiple and accommodated in the box body 101, and a bottom of the box body 101 is a box bottom plate 1013. The cell component 3 is arranged on a side of the shell component 1 facing the box bottom plate 1013 or a side of the shell component 1 away from the box bottom plate 1013.

[0470] During use of the battery 100, for example, vehicle-mounted use, the box bottom plate 1013 is located at a bottom of the box body 101 in a gravity direction, so that when the cell component 3 is arranged on the side of the shell component 1 facing the box bottom plate 1013, it is indicated that the cell component 3 is located at a bottom of the shell component 1 in the gravity direction, and when the cell component 3 is arranged on the side of the shell component 1 away from the box bottom plate 1013, it is indicated that the cell component 3 is located at a top of the shell component 1 in the gravity direction. Thus, the relative position of the pole component 2 and the box bottom plate 1013 is not limited, and flexible setting of the orientation of the battery cells 102 and the box body 101 can be achieved.

[0471] In a fourth aspect, the embodiments of the present application provide a power consumption device 1000, which includes the battery 100 of any of the above-mentioned schemes, and the battery 100 is used to provide electric energy for the power consumption device 1000. The power consumption device 1000 can be any of the devices or systems using the battery 100. Since the performance of the battery 100 is improved, the working power consumption performance of the power consumption device 1000 is also improved.

[0472] In the following, the battery cells 102 of several specific embodiments and their assembly methods are described.

[0473] Embodiment one

[0474] In combination with FIGS. 38A-38E, the shell component 1 has an accommodation cavity 13 and includes a shell body 11 participating in surrounding the accommodation cavity 13, one end of the shell body 11 has an opening 113, the shell cover 12 is a flat plate and covers the opening 113, 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 thereon; the pole component 2 is mounted on the first shell wall 111 and covers the mounting hole 112. The cell component 3 includes a plurality of cell assemblies 31 stacked to have a cell main body 32 accommodated in the accommodation cavity 13 and a tab group 33 connected with the cell main body 32, the tab group 33 is connected with the pole component 2 through the adapter 5, and a part of the adapter 5 is accommodated in the accommodation groove 5 surrounded by the pole component 2. The pole component 2 is in a minimalist form and includes a pole main body 21, an adapter structure 22, and an insulation structure 23, the adapter structure 22 surrounds the pole main body 21, the insulation structure 23 is insulatively fitted between the pole main body 21 and the adapter structure 22, the adapter structure 22 is connected with the first shell wall 111, and the pole main body 21 is connected with the tab group 33.

[0475] In combination with FIGS. 38A-38E, in the process of processing the battery cell 102, a plurality of the cell assembly 31 is stacked along the thickness direction (e.g., the fourth direction F4) of the cell assembly 31, the plurality of the cell assembly 31 is stacked and connected with the multi-layered tab sheet 311 of the same polarity to form the first gathered portion 332, then the first gathered portion 332 is connected with the adapter 35, the cell assembly 3 is loaded into the shell body 11 according to the direction of the tab group 33 relative to the cell body 32 toward the mounting hole 112, and as the cell assembly 3 is loaded into the shell body 11, the adapter 35 is caused to pass out to the outside of the mounting hole 112, the adapter 35 is connected with the pole assembly 2 placed outside the first shell wall 111 outside the first shell wall 111, then the pole assembly 2 connected with the adapter 35 is covered on the outside of the first shell wall 111 from the mounting hole 112, and then the adapter structure 22 is welded and fixed with the first shell wall 111.

[0476] In the welding position of the pole assembly 2 and the gathered portion 313, which is located outside the shell body 11, the problem of the conductive debris formed in the welding process entering the shell body 11 and causing damage to the cell assembly 3 can be improved.

[0477] Embodiment Two

[0478] In combination with FIGS. 40A-40D, the shell assembly 1 has a receiving cavity 13, and includes a shell body 11 participating in enclosing the receiving cavity 13, the shell body 11 has an opening 113 at one end, 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 pole assembly 2 is installed on the first shell wall 111 and covers the mounting hole 112. The cell assembly 3 includes a plurality of cell assemblies 31 stacked to have a cell body 32 received in the receiving cavity 13, and a tab group 33 connected with the cell body 32, the tab group 33 is connected with the pole assembly 2. The pole assembly 2 includes a pole body 21, an adapter structure 22, and an insulation structure 23, the adapter structure 22 surrounds the pole body 21, the insulation structure 23 is insulatively fitted between the pole body 21 and the adapter structure 22, the adapter structure 22 is connected with the first shell wall 111, and the pole body 21 is connected with the tab group 33.

[0479] In combination with FIGS. 40A-40D, when the battery cell 102 is processed, a plurality of cell assemblies 31 are stacked along the thickness direction (e.g., the fourth direction F4) of the cell assemblies 31, the plurality...

Claims

1. A battery cell, wherein, The battery monomer comprises: a shell component having a containing cavity and comprising a first shell wall participating in defining the containing cavity; a pole column component mounted on the first shell wall and comprising a pole column body; an electric core component comprising at least one electric core group, the electric core group comprising n electric core bodies, the n electric core bodies being arranged in the containing cavity and sequentially arranged along a first direction, each electric core body being connected with a tab group, all the tab groups of the electric core group extending towards and connected to form a tab part near a middle position of the electric core group in the first direction, the tab part being electrically connected with the pole column body, n being a positive integer greater than or equal to 1.

2. The battery cell of claim 1, wherein, In the first direction, the middle position has a midpoint, and a size of the middle position is less than or equal to 1 / 2 of a size of one electric core body.

3. The battery cell of claim 1 or 2, wherein, The battery monomer comprises m electric core groups, m being a positive integer greater than or equal to 1, m is equal to 1 and n is equal to 1; or at least one of m and n is greater than or equal to 2.

4. The battery monomer according to any one of claims 1-3, wherein a number of the electric core bodies of at least one electric core group is an odd number; and / or a number of the electric core bodies of at least one electric core group is an even number. The battery monomer comprises m electric core groups sequentially arranged along the first direction, m being a positive integer greater than or equal to 2, and a number of the electric core bodies of the multiple electric core groups is equal or unequal.

5. The battery cell of any one of claims 1-4, wherein, The electric core component further comprises an adapter, and the tab part is electrically connected with the pole column body through the adapter.

6. The battery cell of claim 5, wherein, The adapter comprises a main structure and multiple branch structures, the main structure is connected with the pole column body, each branch structure is connected at an end of the main structure away from the pole column body and comprises at least one branch segment, so that the adapter is configured as a fractal tree structure, and each last branch segment of the branch structure is connected with one tab part.

7. The battery cell of claim 6, wherein, The adapter comprises a first connecting part, a bending part and a second connecting part, the first connecting part and the second connecting part are opposite, the bending part is bent and connected between the first connecting part and the second connecting part, and at least part of the second connecting part is configured as the multiple branch structures.

8. The battery cell of claim 7, wherein, The connection position of the main structure and the branch structure is located at a middle position of the m electric core groups in the first direction.

9. The battery cell of claim 7 or 6, wherein, An extension length of the adapter is L1, L1 > b + λ / 2, b is an extension length of a part of the adapter connected with the tab part, the pole column body has a welding surface, a part of the welding surface is welded with the adapter, and λ is a size of the welding surface in the first direction.

10. The battery cell of any one of claims 6-9, wherein, L1 ≥ b + λ / 2 + W / 2, and W is a size of the pole column component in the first direction.

11. The battery cell of claim 10, wherein, 12. The battery monomer according to any one of claims 6-11, wherein all the tab groups of the electric core group, or a conductive part formed after the tab part is connected with the adapter, is bent to form an open slot; or ​ All of the tab groups of the battery cell group, or the conductive parts formed after the tab parts are connected with the adapter, are bent to form a plurality of open grooves, and the plurality of open grooves are sequentially arranged from the direction of the battery cell body to the pole part, and the openings of adjacent two open grooves are arranged at an included angle.

13. The battery cell of any one of claims 6-12, wherein, An end of the adapter away from the pole body has a clamping structure, the clamping structure includes two oppositely arranged clamping parts, the tab part is clamped between the two clamping parts, and is connected with each clamping part.

14. The battery cell of any one of claims 6-13, 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, the bending part is bent and connected between the first connecting part and the second connecting part, the first connecting part is connected with the pole body, and the second connecting part is connected with the tab part.

15. The battery cell of claim 14, wherein, The thickness of the bending part is less than the thickness of at least one of the first connecting part and the second connecting part; and / or, In the extension direction of the central axis of the bending part, the width of the bending part is less than the width of at least one of the first connecting part and the second connecting part.

16. The battery cell of any one of claims 6-15, wherein, The adapter includes a plurality of adapter foils, the plurality of adapter foils are stacked and arranged, and the stacked and arranged parts are connected to form a first connecting part and a second connecting part arranged at intervals, the first connecting part is connected with the pole body, and the second connecting part is connected with the tab part.

17. The battery cell of claim 16, wherein, The adapter forms a third connecting part between the first connecting part and the second connecting part, and the third connecting part is bent and connected with the first connecting part and the second connecting part.

18. The battery cell of claim 16 or 17, 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 are respectively connected to the two sides of the thickness of the tab part.

19. The battery cell of any one of claims 6-18, wherein, All of the tab groups of the battery cell group are gathered and bent to form an open groove, the adapter includes a first connecting part and a second connecting part, the first connecting part is connected with the pole part, the second connecting part extends into one of the open grooves, and is connected with the tab part to support the tab part.

20. The battery cell of claim 19, wherein, The at least part of the tab part on the first shell wall is projected onto the projection range of the second connecting part on the first shell wall, and the thickness of the second connecting part is greater than or equal to the thickness of the tab part.

21. The battery cell of claim 19 or 20, wherein, All of the tab pieces of the battery cell group converge to form a gathered part near the position of the battery cell body, one end of the gathered part is bent and connected with the tab part, the other end is connected with the battery cell body, and the end surface of the part where the second connecting part is connected with the tab part extends to the position near the bending of the gathered part.

22. The battery cell of any one of claims 5-21, wherein, Further comprising: An insulating part is arranged in the accommodating cavity and is formed with a through hole, and the insulating part blocks the part of the tab group and / or the adapter passing through the through hole to the side of the insulating part away from the battery cell body from the battery cell body.

23. The battery cell of claim 22, wherein, The insulating part includes: An insulating film fully covers the cell body, and the insulating film is formed with the through hole at a position opposite to the first shell wall, and a portion of the insulating film around the through hole is interposed between the portion of the tab group passing through the through hole to the side of the cell body facing the post body and the cell body.

24. The battery cell of claim 22, wherein, The insulating member comprises: An insulating support is arranged at a side of the cell body facing the first shell wall, and the insulating support is formed with the through hole at a position opposite to the post member, and a portion of the insulating support around the through hole is interposed between the adapter and the cell body.

25. The battery cell of any one of claims 5-24, wherein, The post member surrounds a receiving groove recessed in a direction away from the cell member relative to the first shell wall and open in a direction facing the cell member, and at least a portion of the adapter is received in the receiving groove.

26. The battery cell of any one of claims 1-25, wherein, The post member further comprises an adapter structure and an insulating structure, the adapter structure surrounds the post body and is connected with the first shell wall, and the insulating structure is insulated and fitted between the adapter structure and the post body.

27. The battery cell of claim 26, wherein, The insulating structure comprises a sealing structure, the sealing structure is annularly arranged at a circumferential side of the adapter structure facing the post body, and is at least partially clamped between the adapter structure and the post body in an inner-outer direction of the first shell wall.

28. The battery cell of claim 27, wherein, The post body comprises a peripheral portion, the adapter structure is clamped on both sides of the peripheral portion in the inner-outer direction of the first shell wall through the insulating structure, and the sealing structure is clamped between a side of the peripheral portion facing the cell member and the adapter structure.

29. The battery cell of claim 27, wherein, The adapter structure comprises a fitting ring portion, the post body comprises a penetrating portion penetrating the fitting ring portion, and an inner limiting portion and an outer limiting portion connected with the penetrating portion and clamped on both sides of the fitting ring portion, and at least a portion of the sealing structure is clamped between the fitting ring portion and the adapter structure.

30. The battery cell of any one of claims 1-29, wherein, The shell member comprises a shell body and a shell cover, the shell body is an integral piece and open at one end, the shell cover is arranged at the open end of the shell body, An end of the shell body opposite to the shell cover is the first shell wall. Alternatively, the shell cover is the first shell wall.

31. The battery cell of any one of claims 1-30, wherein, Further comprising: A pressure relief member is arranged at the shell member and located at the same side or different side of the post member.

32. A method of processing, wherein, The processing method is used for processing the battery cell according to any one of claims 1-31, and the processing method comprises: Extending all the tab groups of the cell group towards a position close to a middle part of the cell group in the first direction; Loading the cell member into the receiving cavity, and arranging the cell member such that one end of the tab group is arranged on the inner side of the first shell wall opposite to the first shell wall; Mounting the post member on the first shell wall, and connecting all the tab groups with the post body.

33. The method of processing according to claim 32, wherein, The first shell wall is formed with a mounting hole, one end of the cell member is connected with a conductive portion, and the conductive portion comprises the tab portion or comprises the tab portion and an adapter; The step of mounting the post member on the first shell wall and connecting all the tab groups with the post body comprises: The one end of the conductive part away from the cell body is connected with the pole post body through the installation hole; The pole post part connected with the conductive part is covered on the installation hole from the inner side or the outer side of the first shell wall; Or, The pole post part is installed on the first shell wall, and the step of connecting all the tab groups with the pole post body comprises: The cell part is placed on the inner side of the first shell wall, and the one end of the conductive part away from the cell body is connected with the pole post body; The pole post part connected with the conductive part is covered on the installation hole from the inner side or the outer side of the first shell wall.

34. The method of processing according to claim 33, wherein, The pole post part connected with the conductive part is covered on the installation hole from the inner side or the outer side of the first shell wall, or the pole post part connected with the conductive part is covered on the installation hole from the inner side or the outer side of the first shell wall after passing through the installation hole, and the step comprises: When the pole post part is installed on the first shell wall, the part of the conductive part between the first shell wall and the cell body is in a bent shape.

35. The method of processing according to claim 34, wherein, The battery monomer comprises an insulating support on the inner side of the first shell wall; When the pole post part is installed on the first shell wall, the part of the conductive part between the first shell wall and the cell body is in a bent shape, and the step comprises: When the pole post part is installed on the first shell wall, the part of the conductive part between the first shell wall and the cell body is bent to form at least one open slot; Part of the insulating support is inserted into at least one open slot.

36. The method of processing according to claim 35, wherein, The conductive part comprises at least one tab part and an adapter, When the pole post part is installed on the first shell wall, the part of the conductive part between the first shell wall and the cell body is in a bent shape, and the step comprises: When the pole post part is installed on the first shell wall, the tab group and the adapter are connected, the tab group is bent to form a first open slot, the adapter is bent to form a second open slot adjacent to the first open slot and on the side of the first open slot facing the pole post body, and the openings of the second open slot and the first open slot are arranged at an included angle; Part of the insulating support is inserted into at least one of the first open slot and the second open slot.

37. The processing method according to any one of claims 34-36, wherein The one end of the conductive part away from the cell body is connected with the pole post body through the installation hole; The angle of the pole post part is adjusted to make the normal of the inner end surface of the pole post body close to the stacking direction of the plurality of cell bodies, The pole post part connected with the conductive part is covered on the installation hole from the inner side or the outer side of the first shell wall. The one end of the cell body is connected with a conductive part, and the conductive part comprises a tab group and an adapter, 38. The method of processing according to claim 37, wherein, ​ When the pole column component is installed on the first shell wall, the tab group is bent to form a first opening slot after the tab group and the adapter are connected, and the adapter extends into the first opening slot.

39. The method of processing according to claim 38, wherein, When the pole column component is installed on the first shell wall, the adapter is bent to form a second opening slot adjacent to the first opening slot and on the side of the first opening slot facing the pole column body, the opening of the second opening slot and the first opening slot is arranged at an included angle, and at least part of the side wall of the second opening slot facing the battery body extends into the first opening slot.

40. The processing method of any one of claims 32-39, wherein, The battery body is connected with a conductive part at one end, and the conductive part includes the tab group and the adapter, and the tab group includes a plurality of tab pieces. The step of extending all the tab groups of the battery group towards the middle position of the battery group in the first direction includes: The plurality of tab pieces converge towards the middle position to form a laminated part at the free end; The laminated part is connected with the adapter.

41. The method of processing according to claim 40, wherein, The step of connecting the laminated part with the adapter includes: The plurality of tab pieces of the tab group are connected at the laminated part position to form a tab part, and at least part of the tab part is connected with the adapter; or At least part of the laminated part is directly connected with the adapter.

42. The method of processing according to claim 40 or 41, wherein, The end of the adapter away from the pole column body has a clamping structure and includes two oppositely arranged clamping parts. The step of connecting the laminated part with the adapter includes: The two clamping parts are arranged on both sides of the free end to clamp the free end; The two clamping parts are connected with the free end.

43. The processing method of any one of claims 40-42, wherein, The adapter includes a plurality of adapter foils. Before connecting the laminated part with the adapter, it further includes: The plurality of adapter foils are arranged in layers; The layered partial region is connected to form a first connection part; The step of connecting the laminated part with the adapter includes: The layered partial region of the plurality of adapter foils is connected with the free end, so that the layered partial region forms a second connection part spaced apart from the first connection part; The first connection part is connected with the pole column body.

44. The processing method of any one of claims 32-43, wherein, The shell component includes a shell body and a shell cover, and the shell body has an opening; When the end wall opposite to the opening of the shell body is the first shell wall, the step of loading the battery component into the accommodating cavity and arranging the battery component on the inner side of the first shell wall opposite to the first shell wall includes: The battery component is loaded into the accommodating cavity from the opening; The tab group extends out of the mounting hole, so that one end of the battery component arranged with the tab group is arranged on the inner side of the first shell wall opposite to the first shell wall; The shell cover is closed on the opening; When the shell cover is the first shell wall, the step of loading the battery component into the accommodating cavity and arranging one end of the battery component arranged with the tab group on the inner side of the first shell wall opposite to the first shell wall includes: The battery component is supported on the inner side of the shell cover; The tab group is extended from the mounting hole, so that the one end of the cell component provided with the tab group is arranged inside the first shell wall opposite to the first shell wall; The shell body is sleeved outside the cell component, and is connected with the shell cover.

45. The method of claim 44, wherein, When the end wall opposite to the opening of the shell body is the first shell wall, before the cell component is loaded into the accommodating cavity from the opening, S27 is further included, which is wrapping an insulating film outside the cell body; When the shell cover is the first shell wall, before the shell body is sleeved outside the cell component, S28 is further included, which is wrapping an insulating film outside the cell body.

46. A battery, wherein, The battery cell according to any one of claims 1-31.

47. The battery of claim 46, wherein, The battery includes a box body, the battery cell is multiple and is accommodated in the box body, a bottom of the box body is a box bottom plate, the pole part is arranged on a side of the shell part facing the box bottom plate or is arranged on a side of the shell part away from the box bottom plate.

48. An electrical device, comprising: The battery according to claim 46 or 47. The battery according to claim 46 or 47.

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