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

Abstract

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

Description

TECHNICAL FIELD

[0001] The present application relates to the field of battery technologies, and in particular, to a battery cell, a processing method therefor, a battery, and an electric apparatus. BACKGROUND

[0002] In recent years, new energy vehicles have experienced leapfrog development. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and critical role.

[0003] In the related technologies, power batteries include battery cells, and the battery cells, as the core of new energy vehicles, are subject to stringent requirements in terms of reliability. SUMMARY

[0004] Embodiments of the present application provide a battery cell, a processing method therefor, a battery, and an electric apparatus, thereby improving the reliability of the battery cell.

[0005] According to a first aspect, an embodiment of the present application provides a battery cell, including: a housing assembly, provided with an accommodating cavity and including a first housing wall that participates in defining the accommodating cavity; a terminal assembly, mounted on the first housing wall and including a terminal body; and a cell assembly, including cell bodies and an adapter, where the cell bodies are disposed in the accommodating cavity, end portions of the cell bodies are connected to a tab group, the tab group is electrically connected to the terminal body by the adapter, and the adapter supports a free end of the tab group.

[0006] In the foregoing technical solution, the tab group is electrically connected to the terminal body by the adapter, and the adapter supports the free end of the tab group, so that the length of the tab group is reduced and the redundancy of the tab group is reduced, thereby mitigating problems such as wrinkling and bending and fracture of a tab piece of the tab group. In addition, the adapter supports the free end, which is conducive to reducing a risk of short circuit caused by the free end of the tab group being reversely inserted into the cell bodies or reversely inserted to a position of a root of the tab group adjacent to the cell bodies, thereby improving the reliability of the battery cell.

[0007] In some embodiments, the tab group includes a plurality of tab pieces, the plurality of tab pieces of the tab group converge and are connected at a position away from the cell bodies to form a first gathered portion at the free end, and at least a portion of the first gathered portion is connected at a position on a side of a portion of the adapter facing away from the cell bodies.

[0008] In the foregoing technical solution, the first gathered portion is connected to the adapter, and the first gathered portion is somewhat stiff, thereby improving the connection reliability between the first gathered portion and the adapter. At least a portion of the first gathered portion is connected on the side of the portion of the adapter facing away from the cell bodies, so that the portion of the adapter supports at least a portion of the first gathered portion, and a plurality of layers of tab pieces of the first gathered portion are not prone to loosening, thereby improving the reliability of supporting the free end by the adapter.

[0009] In some embodiments, the adapter includes a first connecting portion and a second connecting portion, the first connecting portion is connected to the terminal assembly, the second connecting portion is connected to the first gathered portion and supports the first gathered portion, an orthographic projection of at least a portion of the first gathered portion onto the first housing wall is within a range of an orthographic projection of the second connecting portion onto the first housing wall, and a thickness of the second connecting portion is greater than or equal to that of the first gathered portion.

[0010] In the foregoing technical solution, the orthographic projection of the supported portion of the first gathered portion onto the first housing wall is within the range of the orthographic projection of the second connecting portion, and the thickness of the second connecting portion is greater than or equal to that of the first gathered portion, so that a crosssectional area of the second connecting portion is greater than or equal to that of the first gathered portion, which is conducive to reducing the resistance at the connection position between the second connecting portion and the first gathered portion, and improving the current-carrying capacity at the connection position between the second connecting portion and the first gathered portion, thereby reducing the internal resistance of the battery cell and improving the current-carrying capacity of the battery cell.

[0011] In some embodiments, the plurality of tab pieces of the tab group converge at a position close to the cell bodies to form a second gathered portion, one end of the second gathered portion is bent and connected to the first gathered portion, the other end of the second gathered portion is connected to the cell bodies, and an end surface of a portion of the adapter connected to the first gathered portion extends to a position close to the bend of the second gathered portion.

[0012] In the foregoing technical solution, one end of the second gathered portion is bent and connected to the first gathered portion, and the end surface of the portion of the adapter connected to the first gathered portion extends to the position close to the bend of the second gathered portion, so that the adapter supports the entire first gathered portion, thereby improving the reliability of supporting the free end. In addition, because the plurality of tab pieces of the tab group only converge but are not connected when forming the second gathered portion, the adapter partially and indirectly abuts and presses the position of the bend of the second gathered portion, which is conducive to improving the compactness of the second gathered portion, so that the second gathered portion maintains a preset converged configuration and is kept from dispersing, thereby reducing a risk of the second gathered portion being reversely inserted into the cell bodies.

[0013] In some embodiments, the tab group is bent to form a first open slot, the free end defines at least a portion of a slot wall of the first open slot on a side close to the terminal body, and the adapter extends into the first open slot and abuts against the free end.

[0014] In the foregoing technical solution, the adapter extends into the first open slot formed by bending the tab group and abuts against the free end, thereby improving the reliability of supporting the free end by the adapter. In addition, the bent tab group provides cushioning, so that during the use of the battery cell in a vibration environment, the impact of the cell bodies toward the first housing wall is reduced to protect the cell assembly, thereby improving the reliability of the battery cell.

[0015] In some embodiments, the adapter is bent to form a second open slot adjacent to the first open slot and located on a side of the first open slot facing the terminal body, and opening directions of the second open slot and the first open slot are arranged at an angle.

[0016] In the foregoing technical solution, a conductive portion formed by the tab group and the adapter assumes a serpentine configuration with reciprocating bends, and the conductive portion provides cushioning, so that during the use of the battery cell in a vibration environment, the impact of an active material coating portion toward the first housing wall is reduced to protect the cell assembly, thereby improving the reliability of the battery cell. In addition, because the conductive portion does not extend irregularly, mutual interference and scraping between the tab pieces in the conductive portion are mitigated, and a risk of the tab piece being reversely inserted into the cell bodies is reduced, thereby further improving the reliability of the battery cell.

[0017] In some embodiments, a clamping structure is provided at an end of the adapter away from the terminal body, the clamping structure supports the free end and includes two clamping portions disposed opposite to each other, and the free end is clamped between the two clamping portions and is connected to each of the clamping portions.

[0018] In the foregoing technical solution, the free end is clamped between the two clamping portions, and the two clamping portions are used to constrain the free end of the tab group, which is conducive to improving the connection reliability of the plurality of tab pieces of the tab group at the free end. In addition, one of the two clamping portions disposed adjacent to the cell bodies supports the free end of the tab group, and a side of the free end of the tab group facing away from the terminal body is supported, to prevent the free end of the tab group from moving toward the cell bodies, thereby reducing a risk of reverse insertion. In addition, the two clamping portions protect the free end, to reduce a risk of the tab piece at the free end being prone to connection cracking due to a small thickness or the like, which is conducive to improving the welding quality between the tab group and the adapter tab, thereby improving the connection reliability between the tab group and the adapter tab.

[0019] In some embodiments, the adapter includes the first connecting portion, a bent portion, and the second connecting portion, the first connecting portion and the second connecting portion are opposite to each other, the bent portion is bent and connected between the first connecting portion and the second connecting portion, the first connecting portion is connected to the terminal body, and the second connecting portion supports the free end.

[0020] In the foregoing technical solution, the second connecting portion supports the free end of the tab group, so that the redundancy of the tab group is reduced, and a risk of short circuit caused by the tab group being reversely inserted into the cell bodies is reduced. In addition, the bent adapter provides cushioning and supporting while supporting the free end of the tab group reliably, which is conducive to reducing a risk of the cell assembly impacting the housing assembly, thereby improving the reliability of the battery cell.

[0021] In some embodiments, a thickness of the bent portion is less than that of at least one of the first connecting portion and the second connecting portion; and / or in an extension direction of a central axis of the bent portion, a width of the bent portion is less than that of at least one of the first connecting portion and the second connecting portion.

[0022] In the foregoing technical solution, the thickness of the bent portion is less than that of at least one of the first connecting portion and the second connecting portion, and the width of the bent portion is less than that of at least one of the first connecting portion and the second connecting portion, so that in a material reduction form of reducing the thickness and reducing the width at the bent portion, the first connecting portion and the second connecting portion are somewhat stiff, thereby reliably connecting the adapter and the terminal body and reliably connecting the adapter and the tab group. In addition, the bent portion is weakened to facilitate the bending of the adapter at the position of the bent portion. In particular, when the adapter has a generally plate-shaped structure before assembly and has a structure with the bent position after assembly, the adapter flexibly connects the terminal body to the cell bodies, to facilitate smooth bending at the position of the bent portion in the assembly process of the adapter, thereby improving assembly convenience.

[0023] In some embodiments, the adapter includes a plurality of adapter foils, the plurality of adapter foils are stacked, partial regions of the stack are connected to form the first connecting portion and the second connecting portion that are spaced apart, the first connecting portion is connected to the terminal body, and the second connecting portion is connected to the free end.

[0024] In the foregoing technical solution, the adapter includes the plurality of stacked adapter foils, and the adapter tab has flexible structural and dimensional design by flexibly setting the quantity of adapter foils and configuring the structure and dimensions of individual adapter foils, to improve the applicability and practicability of the adapter tab, which is conducive to simplifying the connection to the terminal body and simplifying the connection to the tab group, thereby improving assembly convenience. In addition, because the partial regions of the stack of the plurality of adapter foils are connected to form the first connecting portion and the second connecting portion that are spaced apart, opposite surfaces of two adjacent adapter foils are partially connected rather than completely connected, which is conducive to reducing the processing procedure of the adapter. In addition, because the thickness of an individual adapter foil is less than that of the adapter, the plurality of adapter foils are equivalent to a multi-layer thin plate, and the adapter formed by the plurality of adapter foils is more prone to bending than an integrally formed adapter tab. In addition, a partial region of the adapter has relatively small stiffness, to facilitate the bending of the adapter in the region with small stiffness in the assembly process of the battery cell, so that the adapter is disposed to flexibly connect the tab group and the terminal body, and the adapter is bent into a configuration in the assembly process of the battery cell, thereby meeting design requirements.

[0025] In some embodiments, a portion 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 and connected to the first connecting portion and the second connecting portion.

[0026] In the foregoing technical solution, in portions of the plurality of adapter foils of the adapter that correspond to the third connecting portion, two adjacent adapter foils are optionally unconnected, and the stiffness of the third connecting portion is less than that of the first connecting portion and that of the second connecting portion, to facilitate bending at the third connecting portion, so that when the structural configuration of the adapter is changed in the assembly process of the adapter, for example, there is no bending at the third connecting portion before assembly and there is bending at the third connecting portion after assembly, assembly convenience is improved. In addition, the bent adapter provides cushioning and supporting while supporting the free end of the tab group reliably, which is conducive to reducing a risk of the cell assembly impacting the housing assembly, thereby improving the reliability of the battery cell.

[0027] In some embodiments, the plurality of adapter foils include 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 two sides of the free end in a thickness direction.

[0028] In the foregoing technical solution, the first adapter foil and the second adapter foil are respectively connected to two sides of the free end in the thickness direction, and the first adapter foil and the second adapter foil separate the free end from a pressurizing apparatus to protect the free end, to reduce a risk of the tab piece of the tab group being prone to connection cracking due to a small thickness or the like, which is conducive to improving the welding quality between the tab group and the adapter, thereby improving the connection reliability between the tab group and the adapter.

[0029] In some embodiments, a plurality of cell bodies sequentially disposed in a second direction form one cell group, all the free ends of the cell group extend toward a middle position of the cell group in the second direction and are connected to form one first gathered portion, and the adapter supports the first gathered portion.

[0030] In the foregoing technical solution, the plurality of cell bodies form one cell group, which is conducive to improving the voltage and capacity of the battery cell. All the free ends of the cell group extend toward a middle position of the cell group in the second direction, so that the offset of a gathering position of the tab group of the cell group relative to the center of a cell group A in a direction shown in the figure is reduced. When the offset is larger, the required length of the tab group is larger. Therefore, the arrangement reduces the length of the tab group, improves the redundancy of the tab group, and reduces a risk of reverse insertion. In addition, the adapter supports the first gathered portion formed by connecting all the free ends of the cell group, thereby electrically connecting all the cell bodies of the cell group to the terminal body, which is conducive to reducing the quantity of the adapters and simplifying the structure of the battery cell.

[0031] In some embodiments, in the second direction, a midpoint of the cell group in the second direction is used as a midpoint of the middle position, and a dimension of the middle position is less than or equal to 1 / 2 of that of one of the cell bodies.

[0032] In the foregoing technical solution, the middle position is not an absolute midpoint. The middle position is a small region formed around the midpoint. Such an arrangement accommodates diverse assembly requirements and use requirements while reducing the length of the tab group, which is conducive to lowering assembly requirements, thereby improving the applicability and practicability of the battery cell.

[0033] In some embodiments, a plurality of cell groups are provided and are sequentially disposed in the second direction, and the adapter supports all the first gathered portions.

[0034] In the foregoing technical solution, the plurality of cell group are disposed, which is conducive to further improving the voltage and capacity of the battery cell. In addition, the adapter supports the first gathered portions of all the cell groups, thereby electrically connecting all the cell bodies of the cell group to the terminal body, which is conducive to further reducing the quantity of the adapters and simplifying the structure of the battery cell.

[0035] In some embodiments, the adapter includes a body structure and a plurality of branch structures, the body structure is connected to the terminal body, each of the branch structures is connected to an end of the body structure away from the terminal body and includes at least one level of branch segment, such that the adapter is configured as a fractal tree structure, and each last-level branch segment of the branch structure supports one first gathered portion.

[0036] In the foregoing technical solution, the adapter is configured as the fractal tree structure, thereby enabling the adapter to electrically connect all the cell bodies to the terminal body and enabling the adapter to connect more cell bodies, so that the adapter occupies a relatively small space.

[0037] In some embodiments, the adapter includes the first connecting portion, the bent portion, and the second connecting portion, the first connecting portion and the second connecting portion are opposite to each other, the bent portion is bent and connected between the first connecting portion and the second connecting portion, and at least a portion of the second connecting portion is configured as the plurality of branch structures.

[0038] In the foregoing technical solution, the bent portion is bent and connected between the first connecting portion and the second connecting portion, and at least a portion of the second connecting portion is configured as the plurality of branch structures, so that the second connecting portion supports all the tab groups, to electrically connect all the tab groups to the terminal body. In addition, the bent adapter provides cushioning and supporting while supporting the free end of the tab group reliably, which is conducive to reducing a risk of the cell assembly impacting the housing assembly, thereby improving the reliability of the battery cell.

[0039] In some embodiments, a connection position between the body structure and the branch structure is a middle position of all the cell groups in a first direction.

[0040] In the foregoing technical solution, the connection position between the body structure and the branch structure is the middle position of all the cell groups in the first direction, thereby reducing the length of the branch structure while the branch structure reliably supports the tab group, which is conducive to reducing the space occupation of the adapter.

[0041] In some embodiments, a quantity of the cell bodies in the cell group is odd or even; and / or quantities of the cell bodies in the plurality of cell groups are equal or unequal.

[0042] In the foregoing technical solution, the cell group is flexibly designed, thereby improving the applicability and practicability of the battery cell.

[0043] In some embodiments, the battery cell further includes: an insulating assembly, disposed in the accommodating cavity, and formed with a through hole, where the insulating assembly is interposed between the cell bodies and a portion of the tab group and / or a portion of the adapter passing through the through hole to a side of the insulating assembly facing away from the cell bodies.

[0044] In the foregoing technical solution, the insulating assembly is used for isolating the cell bodies from the first housing wall of the housing assembly, to reduce a probability that the cell bodies is in contact with the first housing wall of the housing assembly, so that a risk of corrosion of the first housing wall of the housing assembly due to exposure of the cell bodies is reduced, a risk of failure of the cell bodies is reduced, and a risk of electrolyte leakage is reduced, thereby improving the reliability and stability of battery cells. In addition, the insulating assembly is interposed between the cell bodies and the portion of the conductive portion passing through the through hole to the side of the insulating assembly facing away from the cell bodies, to separate the cell bodies from the portion of the conductive portion passing to the side of the insulating assembly facing away from the cell bodies, and reduce a probability that the conductive portion is reversely inserted into the cell bodies due to redundancy or the like, so that a risk of short circuit of the battery cell is reduced, thereby improving the use reliability of the battery cell.

[0045] In some embodiments, the insulating assembly includes: an insulating film, completely wrapping the cell bodies, where the through hole is formed at a position of the insulating film opposite to the first housing wall, and a portion of the insulating film surrounding the through hole is interposed between the cell bodies and a portion of the tab group passing through the through hole to a side of the insulating film facing the terminal body.

[0046] In the foregoing technical solution, because the portion of the insulating film surrounding the through hole is interposed between the cell bodies and the portion of the tab group passing through the through hole to the side of the insulating film facing the terminal body, the dimension of the through hole in the insulating film is compatible with the dimension of the tab group. For example, the dimension of a first avoidance hole is compatible with a thickness of a portion of the tab group located at the first avoidance hole. In one aspect, the through hole allows the tab group to smoothly pass through to electrically connect to the terminal body. In another aspect, when the tab group is in a state of passing through the through hole, the insulating film still wraps positions of roots of the plurality of tab pieces of the tab group adjacent to the cell bodies, to further provide insulating protection for the cell bodies, thereby reducing a risk of exposure of the cell bodies. In addition, a portion of the tab group passing through the through hole is separated from the cell bodies, to reduce a probability that the tab group and / or the adapter is reversely inserted into the cell bodies and a root of the tab group adjacent to the cell bodies due to redundancy or the like of the tab group and / or the adapter, thereby further reducing a risk of short circuit of the battery cell.

[0047] In some embodiments, the insulating assembly includes: an insulating bracket, disposed on a side of the cell bodies facing the first housing wall, where the through hole is formed at a position of the insulating bracket opposite to the terminal assembly, and a portion of the insulating bracket surrounding the through hole is interposed between the adapter and the cell bodies.

[0048] In the foregoing technical solution, because the portion of the insulating bracket surrounding the through hole is interposed between the adapter and the cell bodies, the insulating bracket supports the adapter, and the adapter partially supports the free end of the tab group, so that the insulating bracket insulates the free end of the tab group from the cell bodies, to reduce a probability that the free end of the tab group is reversely inserted into the cell bodies and reversely inserted into a root of the tab group adjacent to the cell bodies, and reduce a risk of short circuit, thereby improving the reliability of the battery cell.

[0049] In some embodiments, the terminal assembly further includes an adapter structure and an insulating structure, the adapter structure surrounds the terminal body and is connected to the first housing wall, and the insulating structure is fitted between the adapter structure and the terminal body in an insulating manner.

[0050] In the foregoing technical solution, the terminal assembly has a simple structure and is easy to process. Because the terminal assembly includes the terminal body and the adapter structure, the shape and dimension of the terminal body and the shape and dimension of the adapter structure are separately designed based on different factors, to flexibly adapt to connection requirements for housing assemblies and cell assemblies in different forms, thereby expanding the application range of the terminal assembly.

[0051] In some embodiments, the insulating structure includes a sealing structural member, the sealing structural member is disposed around a peripheral side of the adapter structure facing the terminal body, and at least a portion of the sealing structural member is clamped between the adapter structure and the terminal body in an inner-outer direction of the first housing wall.

[0052] In the foregoing technical solution, at least a portion of the sealing structural member is clamped between the adapter structure and the terminal body in the inner-outer direction of the first housing wall, so that the adapter structure and the terminal body are axially sealed, to achieve a reliable sealing effect through axial sealing, thereby mitigating a leakage problem at a fitting position between the adapter structure and the terminal body. In addition, in the embodiments of the present application, axial sealing is integrated into the terminal assembly, thereby reducing an axial force acting on the first housing wall. In addition, the sealing structural member is disposed around an inner ring of the adapter structure, and the sealing structural member is closer to the fitting position between the adapter structure and the terminal body, which is conducive to achieving sealing at the fitting position between the adapter structure and the terminal body with a reduced path length, thereby improving sealing reliability, and is conducive to reducing the dimension of the sealing structural member, thereby reducing a sealing area, so that it is easy to achieve compression sealing of the sealing structural member, and sealing is not prone to failure, thereby improving the sealing effect.

[0053] In some embodiments, the terminal body includes a peripheral portion, the adapter structure is clamped on two sides of the peripheral portion in the inner-outer direction of the first housing wall through the insulating structure, and at least a portion of the sealing structural member is clamped between the adapter structure and a side of the peripheral portion facing the cell assembly.

[0054] In the foregoing technical solution, the terminal assembly has a simple structure and is easy to process, so that relative fixation and insulating fitting of the terminal body and the adapter structure are readily and effectively achieved. In addition, the peripheral portion of the terminal body and the adapter structure are used to clamp the sealing structural member, and the sealing structural member is at the fitting position between the adapter structure and the terminal body, which is conducive to achieving sealing at the fitting position between the adapter structure and the terminal body with a reduced path length, thereby improving sealing reliability, and is conducive to reducing the dimension of the sealing structural member, thereby reducing a sealing area, so that it is easy to achieve compression sealing of the sealing structural member, and sealing is not prone to failure, thereby improving the sealing effect. In addition, because at least a portion of the sealing structural member is clamped between the adapter structure and the side of the peripheral portion facing the cell assembly, the sealing structural member achieves sealing from a side of the peripheral portion facing the accommodating cavity, so that an electrolyte solution is prevented more effectively from leaking from the fitting position between the terminal body and the adapter structure, thereby improving a sealing effect.

[0055] In some embodiments, the adapter structure includes a mating ring portion, the terminal body includes a penetrating portion passing through the mating ring portion and an inner limiting portion and an outer limiting portion that are connected to the penetrating portion and clamped on two sides of the mating ring portion, and at least a portion of the sealing structural member is clamped between the mating ring portion and the inner limiting portion.

[0056] In the foregoing technical solution, the terminal assembly has a simple structure and is easy to process, so that relative fixation and insulating fitting of the terminal body and the adapter structure are readily and effectively achieved. In addition, the sealing structural member is clamped at a fitting position between the terminal body and the mating ring portion, and the sealing structural member is at the fitting position between the adapter structure and the terminal body, which is conducive to achieving sealing at the fitting position between the adapter structure and the terminal body with a reduced path length, thereby improving sealing reliability, and is conducive to reducing the dimension of the sealing structural member, thereby reducing a sealing area, so that it is easy to achieve compression sealing of the sealing structural member, and sealing is not prone to failure, thereby improving the sealing effect. In addition, because at least a portion of the sealing structural member is clamped between the mating ring portion and inner limiting portion, the sealing structural member achieves sealing from a side of the mating ring portion facing the accommodating cavity, so that an electrolyte solution is prevented more effectively from leaking from the fitting position between the terminal body and the adapter structure, thereby improving a sealing effect.

[0057] In some embodiments, the terminal assembly defines an accommodating groove recessed away from the cell assembly relative to the first housing wall and open toward the cell assembly, and at least a portion of the adapter is accommodated in the accommodating groove.

[0058] In the foregoing technical solution, the accommodating groove accommodates the adapter, to reduce the space occupation of the adapter in the accommodating cavity, so that the accommodating cavity has a larger space for accommodating the cell bodies, which is conducive to increasing the sizes of the cell bodies, thereby improving the energy density of the battery cell. In addition, because the accommodating groove is open toward the cell assembly, the adapter easily extends into the accommodating groove, thereby reducing operation difficulty.

[0059] In some embodiments, the housing assembly includes a housing body and a housing cover, the housing body is integrally formed and open at one end, and the housing cover is disposed at the open end of the housing body, and an end of the housing body opposite to the housing cover is the first housing wall; or the housing cover is the first housing wall.

[0060] In the foregoing technical solution, the structure of the housing assembly is flexibly designed, and an arrangement position of the terminal assembly is flexible.

[0061] In some embodiments, the battery cell further includes: a pressure relief assembly, disposed on the housing assembly, and located on the same side as or a different side from the terminal assembly.

[0062] In the foregoing technical solution, when the pressure relief assembly and the terminal assembly are located on the same side, the design of housing walls other than the first housing wall is simplified, thereby simplifying the structure and processing of the battery cell. When the pressure relief assembly and the terminal assembly are located on different sides, the size of the terminal assembly is reduced without considering the space occupation of the pressure relief assembly on the first housing wall, so that the shape and size of the terminal assembly are flexibly designed as required.

[0063] According to a second aspect, an embodiment of the present application provides a processing method. The processing method is used for processing the foregoing battery cell. The processing method includes: mounting the cell assembly into the accommodating cavity, such that an end of the cell assembly provided with the tab group is on an inner side of the first housing wall and disposed opposite to the first housing wall; and mounting the terminal assembly on the first housing wall, and connecting the tab group to the terminal body by the adapter, such that the adapter supports the free end of the tab group.

[0064] In the foregoing technical solution, the adapter supports the free end of the tab group in an assembly process, so that the free end is prevented from moving toward the cell bodies, to reduce a risk of short circuit caused by the tab group moving toward the cell bodies to be reversely inserted into the cell bodies, which is conducive to improving the reliability of the battery cell.

[0065] In some embodiments, a mounting hole is formed in the first housing wall; and the step of mounting the terminal assembly on the first housing wall, and connecting the tab group to the terminal body by the adapter, such that the adapter supports the free end of the tab group includes: connecting one end of the adapter to the tab group, and passing the other end of the adapter through the mounting hole to extend to an outer side of the first housing wall to be connected to the terminal body; and covering the mounting hole from the inner side or outer side of the first housing wall with the terminal assembly to which the adapter is connected; or the step of mounting the terminal assembly on the first housing wall, and connecting the tab group to the terminal body by the adapter, such that the adapter supports the free end of the tab group, to prevent the free end from moving toward the cell bodies includes: placing the cell assembly on the inner side of the first housing wall, connecting one end of the adapter to the tab group, and connecting the other end of the adapter to the terminal body; and covering the mounting hole from the inner side or outer side of the first housing wall with the terminal assembly to which the adapter is connected after the terminal assembly passes through the mounting hole.

[0066] In the foregoing technical solution, one end of the adapter is first connected to the tab group, and then the other end of the adapter is passed through the mounting hole to extend to the outer side of the first housing wall to be connected to the terminal body. Because the adapter is not connected to the terminal assembly before passing through the mounting hole, the adapter easily passes through the mounting hole, thereby improving operational convenience. In addition, because a welding position between the terminal assembly and the adapter is located on the outer side of the first housing wall, the problem that conductive debris formed in a welding process enters the housing body to cause damage to the cell assembly is mitigated. The adapter is first connected to the terminal assembly, and then the terminal assembly is mounted on the first housing wall. Because the cell assembly is connected to the terminal assembly before the terminal assembly is passed through the mounting hole, it is not necessary to consider the avoidance of the first housing wall during the connection of the cell assembly 3 to the terminal assembly. In other words, during the connection of the cell assembly to the terminal assembly, the terminal assembly and the cell assembly are not located on two sides of the first housing wall, which is conducive to further reducing the length of the conductive portion, reducing the redundancy of the conductive portion after assembly, and reducing a risk of reverse insertion, thereby improving the reliability of the battery cell. In addition, because a welding position between the terminal assembly and the cell assembly is located outside the housing body, the problem that conductive debris formed in a welding process enters the housing body to cause damage to the cell assembly is mitigated. In addition, because the terminal assembly covers the mounting hole from the outer side of the first housing wall, the adapter structure abuts against the outer side of the first housing wall, and the adapter structure is connected to the first housing wall from the outer side of the first housing wall, thereby facilitating the assembly and connection of the terminal assembly and the first housing wall, which is conducive to improving the connection reliability between the terminal assembly and the first housing wall.

[0067] In some embodiments, the tab group includes the plurality of tab pieces; before the tab group is connected to the adapter, the method further includes: converging the plurality of tab pieces to form a laminated portion at the free end; and the step of connecting one end of the adapter to the tab group includes: connecting the plurality of tab pieces of the tab group at a position of the laminated portion to form the first gathered portion, and connecting at least a portion of the first gathered portion to the adapter; or connecting at least a portion of the laminated portion to the adapter.

[0068] In the foregoing technical solution, the laminated portion is first preconnected, such that the laminated portion forms the somewhat stiff first gathered portion instead of a delaminated and loose multi-layer foil configuration, thereby connecting the first gathered portion to the adapter. In addition, the tab portion and the adapter are welded more reliably, and pores are not easily formed in weld seams, to improve the connection reliability and conductivity at the welding, so that electrical conduction between the cell assembly and the terminal assembly is more stable and reliable. The laminated portion does not need to be preconnected, and the laminated portion is directly connected to the adapter, which is conducive to simplifying the processing procedure and improving processing efficiency, thereby enabling the laminated portion to form the first gathered portion while the laminated portion is connected to the adapter, so that the laminated portion is also reliably connected to the adapter.

[0069] In some embodiments, the clamping structure is provided at the end of the adapter away from the terminal body and includes the two clamping portions disposed opposite to each other; and the step of connecting one end of the adapter to the tab group includes: clamping the free end from two sides of the free end with the two clamping portions; and connecting the two clamping portions to the free end.

[0070] In the foregoing technical solution, the two clamping portions protect the free end, to mitigate the problem that the free end is prone to cracking in a process of connecting the free end to the clamping structure, thereby improving the connection reliability between the adapter and the tab group.

[0071] In some embodiments, the adapter includes the plurality of adapter foils; before one end of the adapter is connected to the tab group, the method further includes: stacking the plurality of adapter foils; and connecting the partial regions of the stack to form the first connecting portion; and the step of connecting one end of the adapter to the tab group, and connecting the other end of the adapter to the terminal body includes: connecting the partial regions of the stack of the plurality of adapter foils to the free end, such that the partial regions of the stack form the second connecting portion spaced apart from the first connecting portion; and connecting the first connecting portion to the terminal body.

[0072] In the foregoing technical solution, the partial regions of the stack are connected to form the first connecting portion to facilitate connection between the plurality of adapter foils, so that the compactness of the adapter foils at the first connecting portion is improved, thereby connecting the adapter to the terminal assembly. "Connecting the plurality of adapter foils to the free end" and "connecting the partial regions of the stack of the plurality of adapter foils to form the second connecting portion" are performed simultaneously, which is conducive to simplifying the processing procedure.

[0073] In some embodiments, the step of covering the mounting hole from the inner side or outer side of the first housing wall with the terminal assembly to which the adapter is connected, or covering the mounting hole from the inner side or outer side of the first housing wall with the terminal assembly to which the adapter is connected after the terminal assembly passes through the mounting hole includes: bending a portion of the tab group and the adapter being connected located between the first housing wall and the cell bodies into a bent shape when the terminal assembly is mounted on the first housing wall.

[0074] In the foregoing technical solution, the conductive portion formed by the tab group and the adapter provides cushioning, so that during the use of the battery cell in a vibration environment, the impact of the cell bodies toward the first housing wall is reduced to protect the cell assembly, thereby improving the reliability of the battery cell. In addition, before the terminal assembly is mounted on the first housing wall, the portion of the tab group and the adapter being connected located between the first housing wall and the cell bodies is basically in an unfolded state, to facilitate the connection between the tab group and the adapter and / or the connection between the adapter and the terminal body, thereby providing a sufficient operation space, for example, thereby laying a portion of the adapter connected to the terminal body on the terminal body for connection.

[0075] In some embodiments, the battery cell includes an insulating bracket located on the inner side of the first housing wall; and the step of bending a portion of the tab group and the adapter being connected located between the first housing wall and the cell bodies into a bent shape when the terminal assembly is mounted on the first housing wall includes: bending, when the terminal assembly is mounted on the first housing wall, the portion of the tab group and the adapter being connected located between the first housing wall and the cell bodies to form the first open slot, where the free end defines at least a portion of the slot wall of the first open slot on the side close to the terminal body; and inserting a portion of the insulating bracket into the first open slot.

[0076] In the foregoing technical solution, the insulating bracket prevents the free end from moving toward the cell bodies, to further reduce a risk of short circuit caused by the tab group moving toward the cell bodies to be reversely inserted into the cell bodies, which is conducive to improving the reliability of the battery cell.

[0077] In some embodiments, the battery cell includes an insulating bracket located on the inner side of the first housing wall; and the step of bending a portion of the tab group and the adapter being connected located between the first housing wall and the cell bodies into a bent shape when the terminal assembly is mounted on the first housing wall includes: bending, when the terminal assembly is mounted on the first housing wall, the portion of the tab group and the adapter being connected located between the first housing wall and the cell bodies to form the first open slot and the second open slot that is adjacent to the first open slot and located on the side of the first open slot facing the terminal body, where the opening directions of the second open slot and the first open slot are arranged at an angle; and inserting portions of the insulating bracket into the first open slot and the second open slot.

[0078] In the foregoing technical solution, the insulating bracket prevents the free end from moving toward the cell bodies, and the insulating bracket further prevents the adapter from moving toward the cell bodies, which is conducive to further reducing a risk of reverse insertion, thereby improving reliability.

[0079] In some embodiments, the step of connecting the other end of the adapter to the terminal body includes: adjusting an angle of the terminal assembly, such that a normal direction of an inner end surface of the terminal body approaches a stacking direction of the plurality of cell bodies; and the step of covering the mounting hole with the terminal assembly to which the adapter is connected includes: adjusting the angle of the terminal assembly from the outer side of the first housing wall, such that the normal direction of the inner end surface of the terminal body approaches a direction perpendicular to the stacking direction of the plurality of cell bodies, the tab group is bent and deformed to form the first open slot, the adapter is bent and deformed to form the second open slot, and the opening directions of the first open slot and the second open slot are arranged at an angle.

[0080] In the foregoing technical solution, the position and angle of the terminal assembly are first adjusted, such that the normal direction of the inner end surface of the terminal body approaches a stacking direction of a plurality of cell subassemblies, and then a portion of the adapter connected to the terminal body is laid on the inner end surface of the terminal body. Subsequently, an angle of the terminal body no longer needs to be adjusted, so that there is a sufficient space near a fitting position between the portion of the adapter connected to the terminal body and the inner end surface of the terminal body for a welding operation on the adapter and the terminal body, thereby simplifying operations. In addition, this further reduces the length of the tab portion. Subsequently, during the adjustment of the angle of the terminal assembly for the connection to the first housing wall, thereby bending the conductive portion to form the first open slot and the second open slot.

[0081] In some embodiments, the housing assembly includes the housing body and the housing cover, and the housing body is provided with an opening; and when an end wall of the housing body opposite to the opening is the first housing wall, the step of mounting the cell assembly into the accommodating cavity, such that the cell assembly is disposed on an inner side of the first housing wall and disposed opposite to the first housing wall includes: mounting the cell assembly into the accommodating cavity from the opening; extending the tab group from the mounting hole, such that the end of the cell assembly provided with the tab group is on the inner side of the first housing wall and disposed opposite to the first housing wall; and covering the opening with the housing cover; or when the housing cover is the first housing wall, the step of mounting the cell assembly into the accommodating cavity, such that an end of the cell assembly provided with the tab group is on an inner side of the first housing wall and disposed opposite to the first housing wall includes: supporting the cell assembly on an inner side of the housing cover; extending the tab group from the mounting hole, such that the end of the cell assembly provided with the tab group is on the inner side of the first housing wall and disposed opposite to the first housing wall; and sleeving the housing body over an outer side of the cell assembly, and connecting the housing body to the housing cover.

[0082] In the foregoing technical solution, the terminal assembly is disposed at an end of the housing body opposite to the opening, which is conducive to mitigating the problem of cracking at a connection between the housing body and the housing cover, thereby improving the reliability of the battery cell. The housing body is first connected to the housing cover, and then the terminal assembly is connected to the housing cover, so that the housing body is used to accommodate the cell assembly and support the housing cover, thereby facilitating positioning and supporting of the housing cover to facilitate the connection between the housing cover and the adapter structure, thereby improving the connection reliability between the housing cover and the terminal assembly.

[0083] In some embodiments, when the end wall of the housing body opposite to the opening is the first housing wall, before the cell assembly is mounted into the accommodating cavity from the opening, the method further includes: wrapping the insulating film around an outer side of the cell bodies; or when the housing cover is the first housing wall, before the housing body is sleeved over the outer side of the cell assembly, the method further includes: wrapping the insulating film around an outer side of the cell bodies.

[0084] In the foregoing technical solution, the cell assembly and the insulating film are loaded into the housing together, thereby facilitating the arrangement of the insulating film, and achieving the insulating arrangement of the cell assembly and the housing assembly.

[0085] According to a third aspect, an embodiment of the present application provides a battery, including the foregoing battery cell.

[0086] In the foregoing technical solution, because the foregoing battery cell is used, the performance of the battery is improved.

[0087] In some embodiments, the battery includes a box body, a plurality of battery cells are provided and accommodated in the box body, a box body bottom plate is provided at a bottom of the box body, and the terminal is disposed on a side of the housing assembly facing the box body bottom plate, or is disposed on a side of the housing assembly facing away from the box body bottom plate.

[0088] In the foregoing technical solution, when the terminal assembly of the battery cell is disposed on the side of the housing assembly facing the box body bottom plate, the battery cell is in an inverted orientation, products of the pressure relief are vented away from a passenger compartment, thereby providing higher safety. When the terminal assembly of the battery cell is disposed on the side of the housing assembly facing away from the box body bottom plate, the battery cell is in an upright orientation, and an electrolyte solution is not prone to leakage. Therefore, the orientations of the battery cell and the box body are flexibly set.

[0089] According to a fourth aspect, an embodiment of the present application provides an electric apparatus, including the foregoing battery.

[0090] In the foregoing technical solution, the performance of the battery is enhanced, thereby enhancing the operational electrical performance of the electric apparatus. BRIEF DESCRIPTION OF THE DRAWINGS

[0091] To describe the technical solutions in the embodiments of the present application more clearly, the following briefly introduces the accompanying drawings required for the embodiments. It is to be understood that the following accompanying drawings show merely some embodiments of the present application and therefore is not to be considered as a limitation to the scope. Persons of ordinary skill in the art still derive other related drawings from these accompanying drawings without creative efforts.

[0092] FIG. 1 is a schematic structural diagram of a vehicle according to some embodiments of the present application;

[0093] FIG. 2 is an exploded view of a battery according to some embodiments of the present application;

[0094] FIG. 3 is a schematic structural diagram of a battery cell according to some embodiments of the present application;

[0095] FIG. 4 is an exploded view of the battery cell shown in FIG. 3;

[0096] FIG. 5 is an exploded view of a battery cell according to some embodiments of the present application;

[0097] FIG. 6 is a cross-sectional view of a battery cell according to some embodiments of the present application;

[0098] FIG. 7 is a partial schematic diagram of the battery cell shown in FIG. 6;

[0099] FIG. 8 is a schematic diagram of an adapter according to some embodiments of the present application;

[0100] FIG. 9 is a schematic diagram of an adapter according to some embodiments of the present application;

[0101] FIG. 10 is a cross-sectional view of a battery cell according to some embodiments of the present application;

[0102] FIG. 11 is a cross-sectional view of a battery cell according to some embodiments of the present application;

[0103] FIG. 12 is a cross-sectional view of a battery cell according to some embodiments of the present application, where in the figure a terminal assembly is in a state before a first housing wall is covered;

[0104] FIG. 13 is a cross-sectional view of a battery cell according to some embodiments of the present application, where in the figure a terminal assembly is in a state before a first housing wall is covered;

[0105] FIG. 14 is a cross-sectional view of a battery cell according to some embodiments of the present application, where in the figure a terminal assembly is in a state before a first housing wall is covered;

[0106] FIG. 15 is a schematic diagram of wrapping of an insulating film according to some embodiments of the present application;

[0107] FIG. 16 is a schematic diagram of wrapping of an insulating film according to some embodiments of the present application;

[0108] FIG. 17 is a schematic diagram of an insulating bracket according to some embodiments of the present application;

[0109] FIG. 18 is a schematic assembly diagram of the insulating bracket shown in FIG. 17;

[0110] FIG. 19 is a schematic diagram of an insulating bracket according to some embodiments of the present application;

[0111] FIG. 20 is a schematic assembly diagram of the insulating bracket shown in FIG. 19;

[0112] FIG. 21 is a schematic diagram of a terminal assembly according to some embodiments of the present application;

[0113] FIG. 22 is another schematic diagram of the terminal assembly shown in FIG. 21;

[0114] FIG. 23 is a view in a direction B in FIG. 22;

[0115] FIG. 24 is a cross-sectional view along C-C in FIG. 22;

[0116] FIG. 25 is a partial cross-sectional view of a battery cell according to some embodiments of the present application;

[0117] FIG. 26 is a partial cross-sectional view of a battery cell according to some embodiments of the present application;

[0118] FIG. 27 is a partial cross-sectional view of a battery cell according to some embodiments of the present application;

[0119] FIG. 28 is a partial cross-sectional view of a battery cell according to some embodiments of the present application;

[0120] FIG. 29 is a partial cross-sectional embodiments of the present application;

[0121] FIG. 30 is a partial cross-sectional embodiments of the present application;

[0122] FIG. 31 is a partial cross-sectional view view view of of of battery battery battery cell cell cell according according according to to to some some some embodiments of the present application, where in the figure a terminal assembly is in a state before a first housing wall is covered;

[0123] FIG. 32 is a partial cross-sectional embodiments of the present application;

[0124] FIG. 33 is a partial cross-sectional embodiments of the present application;

[0125] FIG. 34 is a partial cross-sectional embodiments of the present application; view view view of of of battery battery battery cell cell cell according according according to to to some some some

[0126] FIG. 35 is a flowchart of a processing method for a battery cell according to some embodiments of the present application;

[0127] FIG. 36 is a flowchart of a processing method for a battery cell according to some embodiments of the present application;

[0128] FIG. 37A to FIG. 37E are schematic exploded views of processing according to some embodiments of the present application;

[0129] FIG. 38 is a flowchart of a processing method for a battery cell according to some embodiments of the present application;

[0130] FIG. 39A to FIG. 39D are schematic exploded views of processing according to some embodiments of the present application;

[0131] FIG. 40 is a flowchart of a processing method for a battery cell according to some embodiments of the present application;

[0132] FIG. 41 is a flowchart of a processing method for a battery cell according to some embodiments of the present application;

[0133] FIG. 42 is a flowchart of a processing method for a battery cell according to some embodiments of the present application;

[0134] FIG. 43 is a flowchart of a processing method for a battery cell according to some embodiments of the present application;

[0135] FIG. 44 is a flowchart of a processing method for a battery cell according to some embodiments of the present application;

[0136] FIG. 45 is a flowchart of a processing method for a battery cell according to some embodiments of the present application;

[0137] FIG. 46 is a flowchart of a processing method for a battery cell according to some embodiments of the present application;

[0138] FIG. 47 is a flowchart of a processing method for a battery cell according to some embodiments of the present application;

[0139] FIG. 48 is a flowchart of a processing method for a battery cell according to some embodiments of the present application;

[0140] FIG. 49 is a flowchart of a processing method for a battery cell according to some embodiments of the present application; and

[0141] FIG. 50A to FIG. 50F are schematic exploded views of processing according to some embodiments of the present application.

[0142] List of Reference Numerals:

[0143] Electric apparatus 1000; battery 100; controller 200; motor 300; box body 101; first box portion 1011; second box portion 1012; battery cell 102; first direction F1; second direction F2; third direction F3; fifth direction F5; sixth direction F6; housing assembly 1; housing body 11; first housing wall 111; first recess 1111; lap portion 1112; mounting hole 112; opening 113; second housing wall 114; housing cover 12; accommodating cavity 13; sealing ring 14; terminal assembly 2; terminal body 21; inner end surface 211; outer end surface 213; penetrating portion 214; riveting portion 2141; inner limiting portion 215; outer limiting portion 216; first terminal member 21a; second terminal member 21b; fitting hole 21b1; adapter structure 22; inner end surface 220 of the adapter structure; surrounding region 2201; flange portion 22a; second recess 22b; first adapter ring 221; second adapter ring 222; stop ring portion 2221; first insulating frame 224; third adapter ring 223; inner extension portion 2231; outer extension portion 2232; second insulating frame 225; fourth adapter ring 227; mating ring portion 2271; third insulating frame 228; insulating structure 23; sealing structural member 231; axial side portion 231a; first insulating member 232; second insulating member 234; insulating sealing component 24; cell assembly 3; cell subassembly 31; tab piece 311; laminated portion 312; cell body 32; cell group 32A; tab group 33; free end 331; first gathered portion 332; second gathered portion 333; first open slot 334; axial cross-section 34 of the cell assembly; adapter 35; adapter foil 350; first adapter foil 3501; second adapter foil 3502; first connecting portion 351; second connecting portion 352; bent portion 353; second groove 3531; third connecting portion 354; second open slot 355; clamping structure 356; clamping portion 3561; body structure 357; branch structure 358; branch segment 3581; insulating assembly 4; through hole 40; insulating film 41; tearable structure 411; insulating bracket 42; bracket body 421; first separating piece 422; accommodating groove 5; pressure relief assembly 6; and binding member 8. DETAILED DESCRIPTION

[0144] To make the objectives, technical solutions, and advantages of embodiments of the present application clearer, the following clearly describes the technical solutions in embodiments of the present application with reference to the accompanying drawings in embodiments of the present application. It is clear that the described embodiments are merely some rather than all of embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present application without creative efforts fall within the scope of protection of the present application.

[0145] Unless otherwise defined, all technical and scientific terms used in the present application have the same meanings as commonly understood by persons skilled in the technical field of the present application. The terms used in the filed specification in the present application are merely for an objective of describing specific embodiments, and are not intended to limit the present application. The terms "comprise", "include" and any variations thereof in the specification and claims of the present application and in the above descriptions of the accompanying drawings are intended to cover non-exclusive inclusion. The terms such as "first" and "second" in the specification and claims of the present application or the foregoing accompanying drawings are only used to distinguish between different objects, but are not used to describe a specific order or a primary and secondary relationship.

[0146] Reference to "an embodiment" in the present application means that a specific feature, structure or characteristic described in combination with the embodiment is included in at least one embodiment of the present application. The phrase shown in various locations in the specification does not necessarily refer to a same embodiment, and is not an independent or alternative embodiment exclusive from another embodiment.

[0147] In the description of the present application, it is to be noted that unless otherwise expressly specified and defined, "mounted", "connected", "connection", and "attached" is to be understood in a broad sense, for example, or connected directly or through an intermediate. Persons of ordinary skill in the art understand specific meanings of the foregoing terms in the present application according to specific cases.

[0148] The term "and / or" in the present application describes only an association relationship for describing associated objects and represents that three relationships exist. For example, A and / or B represents the following three cases: Only A exists, both A and B exist, and only B exists. In addition, a character " / " in the present application generally indicates an "or" relationship between contextually associated objects.

[0149] In the embodiments of the present application, identical reference numerals designate identical components. For conciseness, detailed descriptions of identical components are omitted across different embodiments. It is to be understood that the dimensions including thicknesses, lengths, and widths of components illustrated in the embodiments of the present application as well as dimensions such as the overall thickness, length, and width of the integrated apparatus shown in the accompanying drawings are provided for exemplary purposes only and shall not be construed as limiting the scope of the present application.

[0150] The term "a plurality of" as used in the present application refers to two or more (inclusive of two).

[0151] The battery cell in the present application includes 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, a solid-state battery, or the like, which is not limited in the embodiments of the present application. The battery cell is cylindrical, flat-shaped, cuboidshaped, or of another shape, which is also not limited in the embodiments of the present application. Generally, battery cells are classified into three types based on encapsulating methods: columnar battery cells, prismatic battery cells, and pouch battery cells, which are also not limited in the embodiments of the present application.

[0152] A battery mentioned in embodiments of the present application is a single physical module including one or more battery cells to provide a higher voltage and a higher capacity. For example, the battery provided in the present application is a battery module, a battery pack, or the like. The battery module generally includes a plurality of battery cells. The battery generally includes a box body for packaging one or more battery cells or one or more battery modules, and the box body prevents liquid or other foreign matters from affecting charging or discharging of the battery cells. Certainly, the battery alternatively does not include a box body.

[0153] For example, the battery cell usually includes a housing assembly, a cell assembly, and an electrolyte solution (a solid-state electrolyte layer located between positive and negative electrode plates in a solid-state battery). A housing is used for accommodating the cell assembly and the electrolyte solution, and at least one positive electrode terminal and at least one negative electrode terminal are disposed on the housing. The cell assembly includes one or more cell subassemblies. The cell subassembly is formed by stacking or winding a positive electrode plate, a negative electrode plate, and a separator (this structure is omittable in a solid state battery). The material of the housing assembly is not limited, for example, includes but is not limited to an aluminum housing, a steel housing, an aluminum-plastic film, plastic or another material resistant to electrolyte solution corrosion.

[0154] The positive electrode plate generally includes a positive electrode current collector and a positive electrode active substance layer, the positive electrode active substance layer is directly or indirectly coated to the positive electrode current collector, the positive electrode current collector not coated with the positive electrode active substance layer protrudes from the positive electrode current collector already coated with the positive electrode active substance layer, and the positive electrode current collector not coated with the positive electrode active substance layer is used as a positive electrode tab piece. The plurality of positive electrode tab pieces are stacked together and form an electrical connection to the positive electrode terminal. For example, the plurality of positive electrode tab pieces that are stacked together are directly welded to the positive electrode terminal to form the electrical connection. Alternatively, the cell subassembly further includes a positive electrode adapter, the plurality of positive electrode tab pieces that are stacked together are welded to one end of the positive electrode adapter, and the other end of the positive electrode adapter is welded to the positive electrode terminal, such that the positive electrode tab piece forms the electrical connection to the positive electrode terminal.

[0155] The negative electrode plate generally includes a negative electrode current collector and a negative electrode active substance layer, the negative electrode active substance layer is directly or indirectly coated to the negative electrode current collector, the negative electrode current collector that is not coated with the negative electrode active substance layer protrudes from the negative electrode current collector already coated with the negative electrode active substance layer, and the negative electrode current collector that is not coated with the negative electrode active substance layer is used as a negative electrode tab piece. The plurality of negative electrode tab pieces are stacked together and form an electrical connection to the negative electrode terminal. For example, the plurality of negative electrode tab pieces that are stacked together are directly welded to the negative electrode terminal to form the electrical connection. Alternatively, the cell subassembly further includes a negative electrode adapter, the plurality of negative electrode tab pieces that are 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 terminal, such that the negative electrode tab piece forms the electrical connection to the negative electrode terminal. The material of the separator is not limited, and is, for example, polypropylene or polyethylene.

[0156] For a pressure relief assembly in the battery cell mentioned in the present application, when an internal pressure of the battery cell is excessively large (for example, due to overcharging or the like), the pressure relief assembly is used for releasing gases or the like inside the battery cell, to reduce the internal pressure of the battery cell, thereby preventing deflagration or the like of the battery cell caused by excessively rapid pressurization inside the battery cell. For example, the pressure relief assembly is a pressure relief valve, a burst disc, or the like.

[0157] In recent years, new energy vehicles have experienced leapfrog development. In the field of electric vehicles, batteries, as the power source of electric vehicles, play an irreplaceable and critical role. Batteries, as the core of new energy vehicles, are subject to stringent requirements in terms of reliability.

[0158] In the related technologies, a tab of a battery cell is prone to reverse insertion into cell bodies, and as a result the battery cell is prone to short circuit. The reliability of the battery cell needs to be improved, which hinders further improvement of the reliability of a battery.

[0159] Based on the foregoing considerations, a battery cell is provided. The battery cell includes a housing assembly, a terminal assembly, and a cell assembly. The housing assembly is provided with an accommodating cavity and includes a first housing wall that participates in defining the accommodating cavity. The terminal assembly is mounted on the first housing wall, and the terminal assembly includes a terminal body. The cell assembly includes cell bodies and an adapter. The cell bodies are disposed in the accommodating cavity, and end portions of the cell bodies are connected to a tab group. The tab group is electrically connected to the terminal body by the adapter. The adapter supports a free end of the tab group.

[0160] In the foregoing technical solution, the tab group is electrically connected to the terminal body by the adapter, and the adapter supports the free end of the tab group, so that the length of the tab group is reduced and the redundancy of the tab group is reduced, thereby mitigating problems such as wrinkling and bending and fracture of a tab piece of the tab group. In addition, the adapter supports the free end, which is conducive to reducing a risk of short circuit caused by the free end of the tab group being reversely inserted into the cell bodies or reversely inserted to a position of a root of the tab group adjacent to the cell bodies, thereby improving the reliability of the battery cell.

[0161] The technical solution described in embodiments of the present application is applicable to a battery cell, a battery including a battery cell, and an electric apparatus using a battery.

[0162] The electric apparatus is, but not limited to, a vehicle, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, an electric scooter, an electric vehicle, a ship, spacecraft, or the like. The electronic toy includes a fixed or mobile electronic toy, for example, a game console, an electric vehicle toy, an electric ship toy, and an electric aircraft toy. The spacecraft includes an airplane, a rocket, a space shuttle, a spaceship, and the like. The electric tool includes a metal-cutting power tool, a grinding power tool, an assembly power tool and a railway power tool, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an electric impact drill, a concrete vibrator, and an electric planer.

[0163] For ease of description in the following embodiments, an example in which an electric apparatus 1000 is a vehicle is used for description.

[0164] FIG. 1 is a schematic structural diagram of an electric apparatus 1000 being a vehicle according to some embodiments of the present application. The vehicle is a fuel powered vehicle, a gas powered vehicle, or a new energy vehicle. The new energy vehicle is a pure electric vehicle, a hybrid electric vehicle, an extended range vehicle, or the like. The vehicle is provided with a battery 100. The battery 100 is disposed at the bottom, head, or tail of the vehicle. The battery 100 is configured to supply power to the vehicle. For example, the battery 100 is used as a power supply for operating the vehicle. The vehicle further includes a controller 200 and a motor 300. The controller 200 is configured to control the battery 100 to supply power to the motor 300, for example, to meet working power requirements during starting, navigation, and traveling of the vehicle. In some embodiments of the present application, the battery 100 not only serves as a power supply for operating the vehicle, but also serves as a power supply for driving the vehicle, in place of or partially in place of fuel or natural gas, to provide driving power for the vehicle.

[0165] FIG. 2 is a structural exploded view of a battery 100 according to some embodiments of this application. The battery 100 includes a box body 101 and a plurality of battery cells 102. The battery cells 102 are accommodated in the box body 101. The box body 101 is configured to provide an assembly space for the battery cells 102. The box body 101 uses a variety of structures. In some embodiments, the box body 101 includes a first box portion 1011 and a second box portion 1012, the first box portion 1011 and the second box portion 1012 cover each other, and the first box portion 1011 and the second box portion 1012 jointly define the accommodating cavity for accommodating the battery cells 102. A sealing member is further disposed at a connection position between the first box portion 1011 and the second box portion 1012, to achieve a sealed connection between first box portion 1011 and the second box portion 1012.

[0166] For example, referring to FIG. 2, the first box portion 1011 and the second box portion 1012 are alternatively both hollow structures being open on a side. The opening side of the first box portion 1011 covers the opening side of the second box portion 1012 to form the box body 101 with an accommodating space. For another example, the second box portion 1012 is a hollow structure being open at an end, the first box portion 1011 is a plate-shaped structure, and the first box portion 1011 covers the opening side of the second box portion 1012, such that the first box portion 1011 and the second box portion 1012 jointly define the accommodating cavity. Certainly, the box body 101 formed by the first box portion 1011 and the second box portion 1012 is in various shapes, for example, a cylinder, or a cuboid.

[0167] In the battery 100, one or more battery cells 102 are provided. When a plurality of battery cells 102 are provided, the plurality of battery cells 102 are connected in series, parallel, or series-parallel. Series-parallel connection means that both series connection and parallel connection exist among the plurality of battery cells 102. The plurality of battery cells 102 are directly connected in series, parallel, or series-parallel together, and then the whole formed by the plurality of battery cells 102 is accommodated in the box body 101. Alternatively, the battery 100 is in the form of a battery module formed by the plurality of battery cells 102 that are first connected in series, parallel, or series-parallel. A plurality of battery modules are then connected in series, parallel, or series-parallel to form a whole and accommodated in the box body 101. The battery 100 further includes other structures. For example, the battery 100 further includes a busbar component for achieving the electrical connection between the plurality of battery cells 102.

[0168] FIG. 3 is a schematic structural diagram of a battery cell 102 according to some embodiments of the present application. FIG. 4 is an exploded view of the battery cell shown in FIG. 3. FIG. 5 is an exploded view of a battery cell according to some embodiments of the present application. The battery cell 102 is a cuboid. A height direction of the battery cell 102 is a first direction F1, a thickness direction of the battery cell 102 is a second direction F2, a width direction of the battery cell 102 is a third direction F3, and the first direction F1, the second direction F2, and the third direction F3 are pairwise mutually perpendicular. However, the present application is not limited thereto. In another embodiment of the present application, the battery cell 102 is alternatively polygonal prismatic, flat-shaped, or of another shape. Hereinafter, a fourth direction F4 is parallel to the second direction, and a fifth direction F5 is parallel to the first direction.

[0169] FIG. 6 is a cross-sectional view of a battery cell 102 according to some embodiments of the present application. FIG. 7 is a partial schematic diagram of the battery cell 102 shown in FIG. 6. In the embodiments of the present application, the battery cell 102 includes a housing assembly 1, a terminal assembly 2, and a cell assembly 3.

[0170] The terminal assembly 2 is mounted on the housing assembly 1. The housing assembly 1 is provided with an accommodating cavity 13. The housing assembly 1 includes a first housing wall 111. The first housing wall 111 participates in defining the accommodating cavity 13. The terminal assembly 2 is mounted on the first housing wall 111. For example, the first housing wall 111 is provided with a mounting hole 112. The terminal assembly 2 is disposed at the mounting hole. "The terminal assembly 2 is mounted on the first housing wall 111" is that the terminal assembly 2 is assembled and connected to the first housing wall 111 by, for example, welding or riveting. Therefore, the housing assembly 1 and the terminal assembly 2 are separate parts that are assembled and connected. In this way, the housing assembly 1 is separately processed, and the terminal assembly 2 is separately processed, thereby facilitating processing of the housing assembly 1 and the terminal assembly 2, which is conducive to processing and manufacturing of the battery cell 102.

[0171] The cell assembly 3 includes cell bodies 32. The cell bodies 32 are disposed in the accommodating cavity 13, end portions of the cell bodies 32 are connected to a tab group 33, and the tab group 33 is electrically connected to a terminal body 21. For example, the cell assembly 3 includes one or more cell subassemblies 31. Each cell subassembly 31 includes the cell bodies 32 and the tab group 33. Portions of current collectors in the cell subassembly 31 coated with an active material layer form the cell bodies 32, and portions that are not coated with the active material layer form the tab groups 33. The tab groups 33 correspond one to one to the cell bodies 32. The tab group 33 includes a plurality of layers of tab pieces 311.

[0172] The cell assembly 3 further includes an adapter 35. The tab group 33 is electrically connected to the terminal body 21 by the adapter 35. For example, the battery 100 further includes the busbar component located outside the battery cell 102. The busbar component is connected to the terminal body 21 to form electrical conduction, thereby electrically connecting the plurality of battery cell 102 by the busbar component. Therefore, the tab group 33 is indirectly connected to the terminal body 21 by the adapter 35 to form electrical conduction, so that the length of the tab group 33 is reduced and the redundancy of the tab group 33 is reduced, thereby mitigating problems such as wrinkling and bending and fracture of the tab piece 311 of the tab group 33. In addition, the length of the tab group 33 is small, and the adapter 35 is connected to the tab group 33 to partially restrict the tab group 33, which is conducive to reducing a risk of short circuit caused by the tab group 33 being reversely inserted into the cell bodies 32. In addition, the shape, material, or the like of the adapter 35 is flexibly designed, thereby simplifying the connection between the adapter 35 and the terminal body 21 and simplifying the connection between the adapter 35 and the tab group 33, which is conducive to improving the assembly convenience of the battery cell 102.

[0173] In addition, none of an operation on a through hole 40 of the adapter 35, a connection operation (optional) on the adapter 35 and the terminal assembly 2, and a connection operation on the terminal assembly 2 and the housing assembly 1 easily causes cracking at connection positions between the cell bodies 32 and the tab groups 33, thereby improving the reliability of the battery cell 102.

[0174] For example, when the terminal assembly 2 is a negative electrode, the terminal body 21 is an aluminum-copper composite member. The aluminum-copper composite member includes an aluminum portion and a copper portion. The two portions are connected physically. The aluminum portion is disposed on a side of the copper portion facing away from the cell bodies 32, and easily forms a reliable connection to the aluminum busbar component. The copper portion is easily connected to the negative electrode tab piece 311 made of a copper foil or the negative electrode adapter 35. When the terminal assembly 2 is a positive electrode, the terminal body 21 is an aluminum member. The aluminum member easily forms a reliable connection to the aluminum busbar component. The aluminum member is also easily connected to the positive electrode tab piece 311 made of an aluminum foil material or the positive electrode adapter 35.

[0175] A connection manner between the adapter 35 and the tab group 33 is not specifically limited, and a connection manner between the adapter 35 and the terminal body 21 is also not specifically limited. For example, the connection manner between the adapter 35 and the terminal body 21 includes but is not limited to ultrasonic welding, a combination of ultrasonic pre-welding and laser welding, resistance welding, pressure fusion welding, brazing, riveting, punching, and adhesive bonding.

[0176] With reference to FIG. 7, the adapter 35 supports a free end 331 of the tab group 33. For example, a portion of the adapter 35 supports a side of the free end 331 of the tab group 33 facing the cell bodies 32, or, a portion of the adapter 35 supports a side of the free end 331 of the tab group 33 facing away from the terminal body 21, so that the free end 331 of the tab group 33 is located between an inner end surface 211 of the terminal body 21 and the portion of the adapter 35 that supports the free end 331 of the tab group 33. The foregoing supporting arrangement of the adapter 35 prevents the free end 331 of the tab group 33 from moving toward the cell bodies 32. For example, when the tab group 33 is subjected to an external force and the tab group 33 has a tendency to move toward the cell bodies 32, the adapter 35 applies a reaction force to the free end 331 of the tab group 33 to hinder the tendency of the tab group 33 to move toward the cell bodies 32, thereby reducing a risk of short circuit caused by the tab group 33 moving toward the cell bodies 32 and being reversely inserted into the cell bodies 32, which is conducive to improving the reliability of the battery cell 102.

[0177] "The free end 331 of the tab group 33" is understood as an end of the tab group 33 away from the cell assembly 3 in an extension direction of the tab group 33. The tab group 33 is provided with a first end and a second end in the extension direction of the tab group 33. The first end is connected to the cell assembly 3. The second end is the free end 331 of the tab group 33. "The inner end surface 211 of the terminal body 21" is an end surface of the terminal body 21 facing the cell assembly 3. In some examples, the inner end surface 211 of the terminal body 21 is electrically connected to the adapter 35, so that the assembly and connection of the adapter 35 and the terminal body 21 are simplified, thereby improving processing efficiency. Compared with the adapter 35 being connected to another position of the terminal body 21, the length of the adapter 35 is reduced, the materials are saved, and the costs are reduced. Certainly, in another example, the adapter 35 is alternatively electrically connected to another portion of the terminal body 21.

[0178] In the foregoing technical solution, the tab group 33 is electrically connected to the terminal body 21 by the adapter 35, and the adapter 35 supports the free end 331 of the tab group 33, so that the length of the tab group 33 is reduced and the redundancy of the tab group 33 is reduced, thereby mitigating problems such as wrinkling and bending and fracture of a tab piece 311 of the tab group 33. In addition, the adapter 35 supports the free end 331, which is conducive to reducing a risk of short circuit caused by the free end 331 of the tab group 33 being reversely inserted into the cell bodies 32 or reversely inserted to a position of a root of the tab group 33 adjacent to the cell bodies 32, thereby improving the reliability of the battery cell 102.

[0179] Referring to FIG. 7, in some embodiments of the present application, the tab group 33 includes a plurality of tab pieces 311, the plurality of tab pieces 311 of the tab group 33 converge (in other words, gather toward each other) and are connected at a position away from the cell bodies 32 to form a first gathered portion 332 at the free end 331, and at least a portion of the first gathered portion 332 is connected at a position on a side of a portion of the adapter 35 facing away from the cell bodies 32.

[0180] In the foregoing technical solution, the first gathered portion 332 is connected to the adapter 35, and the first gathered portion 332 is somewhat stiff, thereby improving the connection reliability between the first gathered portion 332 and the adapter 35. At least a portion of the first gathered portion 332 is connected on a side of a portion of the adapter 35 facing away from the cell bodies 32, so that the portion of the adapter 35 supports at least a portion of the first gathered portion 332, and a plurality of layers of tab pieces 311 of the first gathered portion 332 are not prone to loosening, thereby improving the reliability of supporting the free end 331 by the adapter 35.

[0181] In the foregoing technical solution, when forming the first gathered portion 332, the plurality of tab pieces 311 of the tab group 33 converge and also are connected into an integral structure. For example, the plurality of tab pieces 311 of the tab group 33 are connected by welding (for example, ultrasonic welding) into an integral plate-like structure to form the first gathered portion 332, or the plurality of tab pieces 311 of the tab group 33 converge and are connected by conductive adhesive bonding or the like to form the first gathered portion 332. This is not limited herein.

[0182] It is to be noted that, in the embodiments of the present application, the tab pieces 311 include positive electrode tab pieces 311 and negative electrode tab pieces 311. The positive electrode tab pieces 311 that need to be gathered together are stacked together and are connected (for example, ultrasonic pre-welding) to form the positive electrode first gathered portion 332, so that inter-layer gaps of the free end 331 of the tab group 33 are reduced, enabling the plurality of delaminated positive electrode tab pieces 311 to form a somewhat stiff plate-like structure at the free end 331. Similarly, the negative electrode tab pieces 311 that need to be gathered together are stacked together and are connected (for example, ultrasonic pre-welding) to form the negative electrode first gathered portion 332, so that inter-layer gaps of the free end 331 of the tab group 33 are reduced, enabling the plurality of delaminated negative electrode tab pieces 311 to form a somewhat stiff plate-like structure at the free end 331.

[0183] Referring to FIG. 7, in some embodiments of the present application, the adapter 35 includes a first connecting portion 351 and a second connecting portion 352, the first connecting portion 351 is connected to the terminal assembly 2, the second connecting portion 352 is connected to the first gathered portion 332, and the second connecting portion 352 supports the first gathered portion 332. The second connecting portion 352 connects the adapter 35 to the tab group 33, and also supports the free end 331 of the tab group 33.

[0184] An orthographic projection of at least a portion of the first gathered portion 332 onto the first housing wall 111 is within a range of an orthographic projection of the second connecting portion 352 onto the first housing wall 111, and a thickness t2 of the second connecting portion 352 is greater than or equal to a thickness t4 of the first gathered portion 332.

[0185] In the foregoing technical solution, the orthographic projection of the supported portion of the first gathered portion 332 onto the first housing wall 111 is within the range of the orthographic projection of the second connecting portion 352, and the thickness of the second connecting portion 352 is greater than or equal to that of the first gathered portion 332, so that a cross-sectional area of the second connecting portion 352 is greater than or equal to that of the first gathered portion 332, which is conducive to reducing the resistance at the connection position between the second connecting portion 352 and the first gathered portion 332, and improving the current-carrying capacity at the connection position between the second connecting portion 352 and the first gathered portion 332, thereby reducing the internal resistance of the battery cell 102 and improving the current-carrying capacity of the battery cell 102.

[0186] For example, the first direction is perpendicular to the first housing wall 111. With a plane in which the first housing wall 111 is located as a projection plane and the first direction as a projection direction, the orthographic projection of the portion of the first gathered portion 332 supported by the adapter 35 is within the range of the orthographic projection of the first connecting portion 352. A dimension of the first gathered portion 332 in the second direction is less than or equal to a dimension of the second connecting portion 352 in the second direction, and a dimension of the first gathered portion 332 in the third direction is less than or equal to a dimension of the second connecting portion 352 in the third direction.

[0187] Referring to FIG. 7, in some embodiments of the present application, the plurality of tab pieces 311 of the tab group 33 converge at a position close to the cell bodies 32 to form a second gathered portion 333, one end of the second gathered portion 333 is bent and connected to the first gathered portion 332, the other end of the second gathered portion 333 is connected to the cell bodies 32, and an end surface of a portion of the adapter 35 connected to the first gathered portion 332 extends to a position close to the bend of the second gathered portion 333.

[0188] In the foregoing technical solution, the second gathered portion 333 is bent and connected to the first gathered portion 332, so that the tab group 33 is bent to form a first open slot 334. The first gathered portion 332 and the second gathered portion 333 are respectively slot walls on two opposite sides of the first open slot 334. An end surface of a portion of the adapter 35 used for supporting the free end 331 extends to the position close to the bend of the second gathered portion 333, thereby enabling the end surface of the portion of the adapter 35 used for supporting the free end 331 to extend beyond the first gathered portion 332, so that the adapter 35 supports the entire first gathered portion 332.

[0189] In the foregoing technical solution, one end of the second gathered portion 333 is bent and connected to the first gathered portion 332, and the end surface of the portion of the adapter 35 connected to the first gathered portion 332 extends to the position close to the bend of the second gathered portion 333, so that the adapter 35 supports the entire first gathered portion 332, thereby improving the reliability of supporting the free end 331. In addition, because the plurality of tab pieces 311 of the tab group 33 only converge but are not connected when forming the second gathered portion 333, the adapter 35 partially and indirectly abuts and presses the position of the bend of the second gathered portion 333, which is conducive to improving the compactness of the second gathered portion 333, so that the second gathered portion 33 maintains a preset converged configuration and is kept from dispersing, thereby reducing a risk of the second gathered portion 333 being reversely inserted into the cell bodies 31.

[0190] In the embodiments of the present application, "the plurality of tab pieces 311 of the tab group 33 converge and are connected at the position close to the cell bodies 32 to form the first gathered portion 332, and the plurality of tab pieces 311 of the tab group 33 converge at the position away from the cell bodies 32 to form the second gathered portion 333" is intended to describe that in an extension direction of the tab piece 311, the second gathered portion 333 and the first gathered portion 332 are sequentially disposed in a direction away from the cell bodies 32. The respective specific positions of the first gathered portion 332 and the second gathered portion 333 are not limited. In other words, neither the second gathered portion 333 needs to be close to the cell bodies 32 nor the first gathered portion 332 needs to be far away from the cell bodies 32. In some optional examples, the current collector of the cell body 32 and the tab piece 311 are integrally formed. For example, a positive electrode plate is an integrally formed aluminum foil. For another example, a negative electrode plate is an integrally formed copper foil or the like.

[0191] Referring to FIG. 7, in some embodiments of the present application, the tab group 33 is bent to form a first open slot 334, at least a portion of the tab group 33 is generally formed into a C shape, the free end 331 defines at least a portion of a slot wall of the first open slot 334 on a side close to the terminal body 21, the adapter 35 extends into the first open slot 334, and the adapter 35 abuts against the free end 331.

[0192] In the foregoing technical solution, the adapter 35 extends into the first open slot 334 formed by bending the tab group 33 and abuts against the free end 331, thereby improving the reliability of supporting the free end 331 by the adapter 35. In addition, the bent tab group 33 provides cushioning, so that during the use of the battery cell 102 in a vibration environment, the impact of the cell bodies 32 toward the first housing wall 111 is reduced to protect the cell assembly 3, thereby improving the reliability of the battery cell 102.

[0193] It is learned that, in the embodiments of the present application, the tab group 33 is bent to form one open slot or form a plurality of open slots. When the tab group 33 is bent to form one open slot, the open slot is the first open slot 334. When the tab group 33 is bent to form a plurality of open slots, the plurality of open slots include the first open slot 334 and a third open slot. In this case, opening directions of two adjacent open slots are arranged at an angle. For example, the opening directions of the two adjacent open slots are arranged at an obtuse angle, or the opening directions of the two adjacent openings are arranged at a 180° angle.

[0194] Referring 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, the second open slot 355 is located on a side of the first open slot 334 facing the terminal body 21, and opening directions of the second open slot 355 and the first open slot 334 are arranged at an angle.

[0195] It is learned that, in a direction from the terminal body 21 to the cell bodies 32, the first open slot 334 and the second open slot 355 are disposed adjacent to each other (as shown in FIG. 7, the first open slot 334 and the second open slot 355 are adjacent vertically, the first open slot 334 generally opens to the left, and the second open slot 355 generally opens to the right).

[0196] Therefore, a conductive portion 4 formed by the tab group 33 and the adapter 35 assumes a serpentine configuration with reciprocating bends, and the conductive portion 4 provides cushioning, so that during the use of the battery cell 102 in a vibration environment, the impact of the cell bodies 32 toward the first housing wall 111 is reduced to protect the cell assembly 3, thereby improving the reliability of battery cells 102. In addition, because the conductive portion 4 does not extend irregularly, mutual interference and scraping between the tab pieces 311 in the conductive portion 4 are mitigated, and a risk of the tab piece 311 being reversely inserted into the cell bodies 32 is reduced, thereby further improving the reliability of battery cells 102.

[0197] For example, referring to FIG. 7 again, the tab group 33 includes the first gathered portion 332 and the second gathered portion 333 that are bent and connected. The first gathered portion 332 and the second gathered portion 333 respectively form the slot walls on two opposite sides of the first open slot 334. The adapter 35 includes the first connecting portion 351 and the second connecting portion 352 that are bent and connected. The first connecting portion 351 and the second connecting portion 352 respectively form slot walls on two opposite sides of the second open slot 355. Therefore, the conductive portion 4 assumes an S configuration with reciprocating bends, so that the length of the conductive portion 4 is reduced to simplify the structure of the conductive portion 4, thereby facilitating the processing of the conductive portion 4.

[0198] Referring to FIG. 7 to FIG. 9, in some embodiments of the present application, a clamping structure 356 is provided at an end of the adapter 35 away from the terminal body 21, the clamping structure 356 supports the free end 331, the clamping structure 356 includes two clamping portions 3561 disposed opposite to each other, the free end 331 is clamped between the two clamping portions 3561, and the free end 331 is connected to each of the clamping portions 3561. The two clamping portions 3561 are respectively disposed on two sides of the free end 331 in a thickness direction.

[0199] For example, an end of the adapter 35 provided with the clamping structure 356 generally has a Y-shaped structure. The two branches of the Y-shaped structure respectively form two clamping portions 3561. The free end 331 is clamped between the two branches, and the free end 331 is electrically connected to each branch.

[0200] In the foregoing technical solution, the free end 331 is clamped between the two clamping portions 3561, and the two clamping portions 3561 are used to constrain the free end 331 of the tab group 33, which is conducive to improving the connection reliability of the plurality of tab pieces 311 of the tab group 33 at the free end 331. In addition, one of the two clamping portions 3561 disposed adjacent to the cell bodies 32 supports the free end 331 of the tab group 33, and a side of the free end 331 of the tab group 33 facing away from the terminal body 21 is supported, to prevent the free end 331 of the tab group 33 from moving toward the cell bodies 32, thereby reducing a risk of reverse insertion.

[0201] In addition, when the free end 331 is fixed (for example, welded) to each clamping portion 3561, the free end 331 is first fitted between two clamping portions 3561, and then pressures are applied to sides of the two clamping portions 3561 that face away from each other to achieve connection. The two clamping portions 3561 separate the free end 331 of the tab group 33 from a pressure applying apparatus, thereby protecting the free end 331 of the tab group 33. The pressure applying apparatus is not in contact with the free end 331 of the tab group 33, to reduce a risk of the tab piece 311 of the tab group 33 being prone to connection cracking due to a thickness or the like, which is conducive to improving the welding quality between the tab group 33 and the adapter 35, thereby improving the connection reliability between the tab group 33 and the adapter 35. In particular, when the thickness of the clamping portion 3561 is greater than that of an individual tab piece 311, the clamping portion 3561 effectively protects the tab piece 311, thereby reducing a risk of cracking during connection of the tab piece 311.

[0202] In some examples, for the structure with the free end 331 of the tab group 33 clamped between the two clamping portions 3561, in a processing process of the battery cell 102, the free end 331 of the tab group 33 first forms the first gathered portion 332, then at least a portion of the first gathered portion 332 is disposed between the two clamping portions 3561, and the first gathered portion 332 is connected to the two clamping portions 3561. In short, the plurality of tab pieces 311 of the tab group 33 are first preconnected (for example, pre-welded) at the free end 331 to form the first gathered portion 332, and then the first gathered portion 332 is connected to the clamping structure 356. Alternatively, the free end 331 of the tab group 33 is first gathered to form a laminated portion, at least a portion of the laminated portion is disposed between two clamping portions 3561, and the laminated portion is connected to the two clamping portions 3561. It is learned that, while the laminated portion is connected to the two clamping portions 3561, a plurality of tab pieces 311 of the laminated portion are connected, such that the first gathered portion 332 is formed at the free end 331 of the tab group 33 at the same time. In short, the plurality of tab pieces 311 of the tab group 33 are only gathered at the free end 331 to form a laminated portion, and while the laminated portion is connected to the clamping structure 356, the plurality of tab pieces 311 of the laminated portion are connected to form the first gathered portion 332. A procedure of preconnecting the plurality of tab pieces 311 at the free end 331 is omitted in the manner. When forming the laminated portion, the plurality of tab pieces 311 of the tab group 33 only converge but are not connected at the free end 331.

[0203] Certainly, in other embodiments of the present application, the clamping structure 356 is alternatively not disposed at the end of the adapter 35 away from the terminal body 21. For example, a flat plate structure is formed at the end of the adapter 35 away from the terminal body 21. The flat plate structure is supported an end of the free end 331 of the tab group 33 facing away from terminal body 21, so that the adapter 35 also supports the free end 331 of the tab group 33, thereby preventing the free end 331 of the tab group 33 from moving toward the cell bodies 32.

[0204] Referring to FIG. 7 to FIG. 9, in some embodiments of the present application, the adapter 35 includes the first connecting portion 351, a bent portion 353, and the second connecting portion 352. The first connecting portion 351 and the second connecting portion 352 are opposite to each other. The bent portion 353 is bent and connected between the first connecting portion 351 and the second connecting portion 352. The first connecting portion 351 is connected to the terminal body 21. The second connecting portion 352 supports the free end 331 of the tab group 33.

[0205] Therefore, the second connecting portion 352 supports the free end 331 of the tab group 33, so that the redundancy of the tab group 33 is reduced, and a risk of short circuit caused by the tab group 33 being reversely inserted into the cell bodies 32 is reduced. In addition, the bent adapter 35 provides cushioning and supporting while supporting the free end 331 of the tab group 33 reliably, which is conducive to reducing a risk of the cell assembly 3 impacting the housing assembly 1, thereby improving the reliability of the battery cell 102.

[0206] In some examples, with reference to FIG. 7, the adapter 35 is generally C-shaped or U-shaped. The first connecting portion 351 generally has a flat plate structure, and the first connecting portion 351 is laid in the inner end surface 211 of the terminal body 21. A surface of a side of the first connecting portion 351 in a thickness direction is connected to the inner end surface 211 of the terminal body 21. An area of the inner end surface 211 of the terminal body 21 is greater than or equal to an area of the surface of the side of first connecting portion 351 in the thickness direction. The first connecting portion 351 lies entirely on the inner end surface 211 of the terminal body 21, which is conducive to increasing a connection area between the inner end surface 211 of the terminal body 21 and the first connecting portion 351, thereby improving current conduction efficiency. In some other examples, the adapter 35 is generally L-shaped. The first connecting portion 351 generally has a flat plate structure. An end surface of an end of the first connecting portion 351 away from the second connecting portion 352 is connected to the inner end surface 211 of the terminal body 21.

[0207] It is to be noted that, in the embodiments of the present application, the adapter 35 supports the free end 331 of the tab group 33, so that the free end 331 of the tab group 33 is located between the portion of the adapter 35 used for supporting the free end 331 and the inner end surface 211 of the terminal body 21. The free end 331 of the tab group 33 and the inner end surface 211 of the terminal body 21 are in contact or spaced apart. When the free end 331 of the tab group 33 is spaced apart from the inner end surface 211 of the terminal body 21, a portion (for example, the foregoing first connecting portion 351) of the adapter 35 is disposed between the free end 331 of the tab group 33 and the inner end surface 211 of the terminal body 21, or no portion of the adapter 35 is disposed between the free end 331 of the tab group 33 and the inner end surface 211 of the terminal body 21.

[0208] In some examples, with reference to FIG. 7 to FIG. 9, the second connecting portion 352 is configured as the clamping structure 356, and the second connecting portion 352 includes two clamping portions 3561 disposed opposite to each other. The thickness of the second connecting portion 352 is a thickness of the clamping structure 356, namely, a sum of 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 to each clamping portion 3561. Certainly, in some other examples, the second connecting portion 352 is alternatively configured as a flat plate structure. The second connecting portion 352 is supported on a side of the free end 331 of the tab group 33 facing away from terminal body 21, such that the free end 331 of the tab group 33 is located between the second connecting portion 352 and the terminal body 21.

[0209] Referring to FIG. 7 and FIG. 8, in some embodiments of the present application, a thickness of the bent portion 353 is less than that of at least one of the first connecting portion 351 and the second connecting portion 352; and / or in an extension direction of a central axis of the bent portion 353, a width of the bent portion 353 is less than that of at least one of the first connecting portion 351 and the second connecting portion 352.

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

[0211] In the foregoing technical solution, the thickness of the bent portion 353 is less than that of at least one of the first connecting portion 351 and the second connecting portion 352, and the width of the bent portion 353 is less than that of at least one of the first connecting portion 351 and the second connecting portion 352, so that in a material reduction form of reducing the thickness and reducing the width at the bent portion 353, the first connecting portion 351 and the second connecting portion 352 are somewhat stiff, thereby reliably connecting the adapter 35 and the terminal body 21 and reliably connecting the adapter 35 and the tab group 33. In addition, the bent portion 353 is weakened to facilitate the bending of the adapter 35 at the position of the bent portion 353. In particular, when the adapter 35 has a generally plate-shaped structure before assembly and has a structure with the bent position after assembly, the adapter 35 flexibly connects the terminal body 21 to the cell bodies 32, to facilitate smooth bending at the position of the bent portion 353 in the assembly process of the adapter 35, thereby improving assembly convenience.

[0212] Certainly, the shape of the adapter 35 before assembly is the same as that after assembly. For example, the adapter 35 is configured as the bent portion 353 being bent and connected to the first connecting portion 351 and the second connecting portion 352 before and after assembly. In this case, the adapter 35 achieves a rigid connection between the terminal body 21 and the cell bodies 32. It is learned that, in the embodiments of the present application, regardless of being used for achieving a flexible connection or a rigid connection, the adapter 35 supports the free end 331 of the tab group 33.

[0213] In some examples, the thickness of the first connecting portion 351 and the thickness of the second connecting portion 352 are both greater than the thickness of the bent portion 353. In this case, a first groove is formed on at least one of two sides of the bent portion 353 in a thickness direction, thereby reducing the thickness of the bent portion 353. In some other examples, the width of the first connecting portion 351 and the width of the second connecting portion 352 are both greater than the width of the bent portion 353. In this case, a second groove is formed on at least one of two sides of the bent portion 353 in a width direction, thereby reducing the width of the bent portion 353.

[0214] Referring to FIG. 8 and FIG. 9, in some embodiments of the present application, the adapter 35 includes a plurality of adapter foils 350, the plurality of adapter foils 350 are stacked, partial regions of the stack are connected to form the first connecting portion 351 and the second connecting portion 352, the first connecting portion 351 and the second connecting portion 352 are spaced apart, the first connecting portion 351 is connected to the terminal body 21, and the second connecting portion 352 is connected to the free end 331.

[0215] It is to be noted that, for the first connecting portion 351, any two adjacent adapter foils 350 of the plurality of adapter foils 350 are directly connected or indirectly connected. For the second connecting portion 352, any two adjacent adapter foils 350 of the plurality of adapter foils 350 are directly connected or indirectly connected. For example, two adjacent adapter foils 350 are indirectly connected by the free end 331 of the tab group 33.

[0216] For example, the partial regions of the stack of the plurality of adapter foils 350 are directly connected to form the first connecting portion 351, and other partial regions of the stack of the plurality of adapter foils 350 are directly connected to form the second connecting portion 352. The second connecting portion 352 is connected to the free end 331 of the tab group 33. In this case, the portions of the second connecting portion 352 that correspond to the plurality of adapter foils 350 are all located on the same side of the free end 331 of the tab group 33. Alternatively, the adapter 35 includes two adapter foils 350, partial regions of the stack of the two adapter foils 350 are directly connected to form the first connecting portion 351, and other partial regions of the stack of the two adapter foils 350 are indirectly connected by the free end 331 of the tab group 33, such that the adapter 35 forms the second connecting portion 352. In this case, the two adapter foils 350 corresponding to the second connecting portion 352 are respectively located on two opposite sides of the free end 331 of the tab group 33. Alternatively, the adapter 35 includes four adapter foils 350. Partial regions of the stack of the four adapter foil 350 are connected to form the second connecting portion 352. In this case, two adapter foils 350 corresponding to the second connecting portion 352 are located on one side of the free end 331 of the tab group 33 in the thickness direction, and the remaining two adapter foils 350 corresponding to the second connecting portion 352 are located on the other side of the free end 331 of the tab group 33 in the thickness direction. Two adapter foils 350 of the second connecting portion 352 that are located on the same side of the free end 331 of the tab group 33 are directly connected, and the adapter foils 350 of the second connecting portion 352 that are located on different sides of the free end 331 of the tab group 33 are indirectly connected by the free end 331 of the tab group 33. Certainly, a quantity of the adapter foils 350 of the adapter 35 is not limited to 2 or 4, and is alternatively 3, 5 or greater than 5.

[0217] In the foregoing technical solution, the adapter 35 includes the plurality of stacked adapter foils 350, and the adapter tab 35 has flexible structural and dimensional design by flexibly setting the quantity of adapter foils 350 and configuring the structure and dimensions of individual adapter foils 350, to improve the applicability and practicability of the adapter tab 35, which is conducive to simplifying the connection to the terminal body 21 and simplifying the connection to the tab group 33, thereby improving assembly convenience.

[0218] In addition, because the partial regions of the stack of the plurality of adapter foils 350 are connected to form the first connecting portion 351 and the second connecting portion 352 that are spaced apart, surfaces of two adjacent adapter foils 350 that are opposite to each other are partially connected rather than completely connected, which is conducive to reducing the processing procedure of the adapter 35. In addition, because the thickness of an individual adapter foil 350 is less than that of the adapter 35, the plurality of adapter foils 350 are equivalent to a multi-layer thin plate, and the adapter 35 formed by the plurality of adapter foils 350 is more prone to bending than an integrally formed adapter tab. In addition, a partial region of the adapter 35 has relatively small stiffness, to facilitate the bending of the adapter 35 in the region with small stiffness in the assembly process of the battery cell 102, so that the adapter 35 is disposed to flexibly connect the tab group 33 and the terminal body 21, and the adapter 35 is bent into a configuration in the assembly process of the battery cell 102, thereby meeting design requirements. For example, the plurality of adapter foils 350 are welded at several critical positions by ultrasonic welding or the like, such that the plurality of adapter foils 350 are connected.

[0219] Referring to FIG. 7 and FIG. 8, in some embodiments of the present application, a portion of the adapter 35 between the first connecting portion 351 and the second connecting portion 352 forms a third connecting portion, and the third connecting portion 354 is bent and connected to the first connecting portion 351 and the second connecting portion 352.

[0220] It is to be understood that in portions of the plurality of adapter foils 350 of the adapter 35 that correspond to the third connecting portion 354, two adjacent adapter foils 350 are optionally unconnected, and the stiffness of the third connecting portion 354 is less than that of the first connecting portion 351 and that of the second connecting portion 352, to facilitate bending at the third connecting portion 354, so that when the structural configuration of the adapter 35 is changed in the assembly process of the adapter 35, for example, there is no bending at the third connecting portion 354 before assembly and there is bending at the third connecting portion 354 after assembly to form the bent portion 353, assembly convenience is improved. In addition, the bent adapter 35 provides cushioning and supporting while supporting the free end 331 of the tab group 33 reliably, which is conducive to reducing a risk of the cell assembly 3 impacting the housing assembly 1, thereby improving the reliability of the battery cell 102.

[0221] Referring to FIG. 8, in some embodiments of the present application, the plurality of adapter foils 350 include 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 respectively connected to two sides of the free end 331 in a thickness direction.

[0222] In the foregoing technical solution, the first adapter foil 3501 and the second adapter foil 3502 are respectively connected to two sides of the free end 331 in the thickness direction, and the first adapter foil 3501 and the second adapter foil 3502 separate the free end 331 from a pressurizing apparatus to protect the free end 331, to reduce a risk of the tab piece 311 of the tab group 33 being prone to connection cracking due to a small thickness or the like, which is conducive to improving the welding quality between the tab group 33 and the adapter 35, thereby improving the connection reliability between the tab group 33 and the adapter 35.

[0223] It is to be understood that a quantity of first adapter foils 3501 is equal or unequal to that of second adapter foils 3502, and a quantity of all the adapter foils 350 of the adapter 35 is odd or even.

[0224] For example, the plurality of adapter foils 350 include at least one first adapter foil 3501 and at least one second adapter foil 3502. The first adapter foil 3501 and the second adapter foil 3502 are respectively connected to the two sides of the free end 331 in the thickness direction. All first adapter foils 3501 located on the same side of the free end 331 in the thickness direction are configured as one clamping portion 3561. All second adapter foils 3502 located on the same side of the free end 331 in the thickness direction are configured as one clamping portion 3561, thereby facilitating the formation of the clamping structure 356.

[0225] Referring to FIG. 10 to FIG. 14, in some embodiments, a plurality of cell bodies 32 sequentially disposed in a second direction form one cell group 32A, all the free ends 331 of the cell group 32A extend toward a middle position of the cell group 32A in the second direction, all the free ends 331 of the cell group 32A are connected to form one first gathered portion 332, and the adapter 35 supports the first gathered portion 332.

[0226] The middle position of the cell group 32A in the second direction corresponds to a gathered region R. In the second direction, a center of the gathered region R is a center of the cell group 32A, and all the free ends 331 of the cell group 32A extend to the gathered region R. In the second direction, at least a portion of the first gathered portion 332 is located inside the gathered region R.

[0227] It is to be understood that, the battery cell 102 has one or more cell groups 32A.

[0228] In the foregoing technical solution, the plurality of cell bodies 32 form one cell group 32A, which is conducive to improving the voltage and capacity of the battery cell 102. All the free ends 331 of the cell group 32A extend toward a middle position of the cell group 32A in the second direction, so that the offset of a gathering position of the tab group 33 of the cell group 32A relative to the center of a cell group 32A in the second direction is reduced. When the offset is larger, the required length of the tab group 33 is larger. Therefore, the arrangement reduces the length of the tab group 33, improves the redundancy of the tab group 33, and reduces a risk of reverse insertion. In addition, the adapter 35 supports the first gathered portion 332 formed by connecting all the free ends 331 of the cell group 32A, thereby electrically connecting all the cell bodies 32 of the cell group 32A to the terminal body 21, which is conducive to reducing the quantity of the adapters 35 and simplifying the structure of the battery cell 102.

[0229] Referring to FIG. 10 and FIG. 11, in some embodiments, in the second direction, a midpoint of the cell group 32A in the second direction is used as a midpoint of the middle position. To be specific, the midpoint of the cell group 32A in the second direction is a midpoint of the gathered region R. A dimension of the middle position is less than or equal to 1 / 2 of that of one of the cell bodies 32. A dimension of the gathered region R in the second direction is less than or equal to 1 / 2 of that of one of the cell bodies 32 in the second direction. In this case, diverse assembly requirements and use requirements are accommodated while the length of the tab group 33 is reduced, which is conducive to lowering assembly requirements, thereby improving the applicability and practicability of the battery cell 102.

[0230] For example, the dimension of the gathered region R in the second direction is 1 / 5, 1 / 4, 1 / 3, 1 / 2, or the like of that of one of the cell bodies 32 in the second direction.

[0231] Referring to FIG. 11 and FIG. 14, in some embodiments, a plurality of cell groups 32A are provided, the plurality of cell groups 32A are sequentially disposed in the second direction, and the adapter 35 supports all the first gathered portions 332.

[0232] In the foregoing technical solution, the plurality of cell group 32A are disposed, which is conducive to further improving the voltage and capacity of the battery cell 102. In addition, the adapter 35 supports the first gathered portions 332 of all the cell groups 32A, thereby electrically connecting all the cell bodies 32 of the cell group 32A to the terminal body 21, which is conducive to further reducing the quantity of the adapters 35 and simplifying the structure of the battery cell 102.

[0233] Referring to FIG. 11 and FIG. 14, in some embodiments, the adapter 35 includes a body structure 357 and a plurality of branch structures 358, the body structure 357 is connected to the terminal body 21, each of the branch structures 358 is connected to an end of the body structure 357 away from the terminal body 21, each of the branch structures 358 includes at least one level of branch segment 3581, such that the adapter 35 is configured as a fractal tree structure, and each last-level branch segment 3581 of the branch structure 358 supports one first gathered portion 332.

[0234] For example, each branch structure 358 includes a first-level branch segment 3581 to a pth-level branch segment 3581 that are sequentially disposed from a portion of the adapter 35 connected to the terminal body 21 to a portion of the adapter 35 connected to the tab group 33. Each pth-level branch segment 3581 supports one first gathered portion 332. The body structure 357 is connected to a plurality of first-level branch segments 3581. Each upper-level branch segment 3581 is connected to a plurality of lower-level branch segments 3581. For example, each first-level branch segment 3581 is in communication with a plurality of second-level branch segments 3581, each (q-1)th-level branch segment 3581 is connected to a plurality of qth-level branch segments 3581, and p and q are positive integers. For example, with reference to FIG. 11, each branch structure 358 includes one level of branch segment 3581, namely, the first-level branch segment 3581. The first-level branch segment 3581 supports the first gathered portion 332. For another example, each branch structure 358 includes two levels of branch segments 3581, namely, the first-level branch segment 3581 and the second-level branch segment 3581. Each first-level branch segment 3581 is connected to the plurality of second-level branch segments 3581, and the second-level branch segment 3581 of each branch structure 358 supports the first gathered portion 332.

[0235] In the foregoing technical solution, the adapter 35 is configured as the fractal tree structure, thereby enabling the adapter 35 to electrically connect all the cell bodies 32 to the terminal body 21 and enabling the adapter 35 to connect more cell bodies 32, so that the adapter 35 occupies a relatively small space.

[0236] For example, the adapter 35 is configured as the fractal tree structure, the quantity of the cell bodies 32 of the battery cell 102 is 2, 3, 4, 5, 6, 7, 8, or the like. A thickness of the cell assembly 3 is expandable to a maximum of 120 mm.

[0237] Referring to FIG. 11, in some embodiments, the adapter 35 includes the first connecting portion 351, the bent portion 353, and the second connecting portion 352, the first connecting portion 351 and the second connecting portion 352 are opposite to each other, the bent portion 353 is bent and connected between the first connecting portion 351 and the second connecting portion 352, and at least a portion of the second connecting portion 352 is configured as the plurality of branch structures 358.

[0238] In the foregoing technical solution, the bent portion 353 is bent and connected between the first connecting portion 351 and the second connecting portion 352, and at least a portion of the second connecting portion 352 is configured as the plurality of branch structures 358, so that the second connecting portion 352 supports all the tab groups 33, to electrically connect all the tab groups 33 to the terminal body 21. In addition, the bent adapter 35 provides cushioning and supporting while supporting the free end 331 of the tab group 33 reliably, which is conducive to reducing a risk of the cell assembly 3 impacting the housing assembly 1, thereby improving the reliability of the battery cell 102.

[0239] In the foregoing technical solution, if a portion of the second connecting portion 352 is configured as the plurality of branch structures 358, a boundary between the body structure 357 and the branch structures 358 (in other words, a connection position between the body structure 357 and the branch structures 358) is located on the second connecting portion 352. If the second connecting portion 352 is configured as the plurality of branch structures 358, the boundary between the body structure 357 and the branch structures 358 is located at a connection position between the second connecting portion 352 and the bent portion 353.

[0240] Referring to FIG. 11, in some embodiments, the connection position between the body structure 357 and the branch structures 358 is located at a middle position of all the cell groups 32A in the second direction. The middle position of all the cell groups 32A in the second direction corresponds to a region R'. In the second direction, a center of the region R' is a center of all the cell groups 32A. In the second direction, the connection position between the body structure 357 and the branch structures 358 is located within the region R'.

[0241] In the foregoing technical solution, the connection position between the body structure 357 and the branch structure 358 is the middle position of all the cell groups 32A in the first direction, thereby reducing the length of the branch structure 358 while the branch structure 358 reliably supports the tab group 33, which is conducive to reducing the space occupation of the adapter 35.

[0242] Optionally, a dimension of the region R' in the second direction is less than or equal to 1 / 2 of that of one of the cell bodies 32 in the second direction, but is not limited thereto.

[0243] Referring to FIG. 10 to FIG. 14, in some embodiments, a quantity of the cell bodies 32 in the cell group 32A is odd or even; and / or quantities of the cell bodies 32 in the plurality of cell groups 32A are equal or unequal. In this way, the cell group 32A is flexibly designed, thereby improving the applicability and practicability of the battery cell 102.

[0244] For example, with reference to FIG. 10 and FIG. 12, one cell group 32A is provided, and the cell group 32A includes two cell bodies 32 disposed in the first direction. For another example, one cell group 32A is provided, and the cell group 32A includes three cell bodies 32 disposed in the first direction. For another example, with reference to FIG. 13, one cell group 32A is provided, and the cell group 32A includes four cell bodies 32 disposed in the first direction. For still another example, with reference to FIG. 11 and FIG. 14, two cell groups 32A are provided, and each cell group 32A includes four cell bodies 32 disposed in the first direction. For another example, two cell groups 32A are provided, one group includes three cell bodies 32, and the other group includes five cell bodies 32. For still another example, the cell group 32A is two groups, one group includes one cell body 32, and the other group includes two cell bodies 32.

[0245] Referring to FIG. 15 and FIG. 16, in some embodiments of the present application, the battery cell 102 further includes an insulating assembly 4. The insulating assembly 4 is disposed in the accommodating cavity 13. The insulating assembly 4 is formed with a through hole 40. The insulating assembly 4 is interposed between the cell bodies 32 and a portion of the tab group 33 and / or a portion of the adapter 35 passing through the through hole 40 to a side of the insulating assembly 4 facing away from the cell bodies 32. The insulating assembly 4 is interposed between the cell bodies 32 and the portion of the tab group 33 passing through the through hole 40 to the side of the insulating assembly 4 facing away from the cell bodies 32, and / or the insulating assembly 4 is interposed between the cell bodies 32 and the portion of the adapter 35 passing through the through hole 40 to the side of the insulating assembly 4 facing away from the cell bodies 32.

[0246] It is learned that, at least a portion of the insulating assembly 4 is disposed between the terminal body 21 and the end portions of the cell bodies 32 connected to the tab group 33. The through hole 40 allows the tab group 33 and / or the adapter 35 to pass through, so that the tab group 33 and / or the adapter 35 passes through the side of the insulating assembly 4 facing away from the cell bodies 32 to be electrically connected to the terminal body 21. Therefore, the insulating assembly 4 is used for isolating the cell bodies 32 from the first housing wall 111 of the housing assembly 1, to reduce a probability that the cell bodies 32 are in contact with the first housing wall 111 of the housing assembly 1, so that a risk of corrosion of the first housing wall 111 of the housing assembly 1 due to exposure of the cell bodies 32 is reduced, a risk of failure of the cell bodies 32 is reduced, and a risk of electrolyte leakage is reduced, thereby improving the reliability and stability of the battery cell 102.

[0247] In addition, if the end portions of the cell bodies 32 are connected to the conductive portion 4, the conductive portion 4 is electrically connected to the terminal body 21, and the conductive portion 4 includes the tab group 33 and the adapter 35, because the insulating assembly 4 is interposed between the cell bodies 32 and the portion of the tab group 33 and / or the portion of the adapter 35 passing through the through hole 40 to the side of the insulating assembly 4 facing away from the cell bodies 32, the insulating assembly 4 is interposed between the cell bodies 32 and a portion of the conductive portion passing through the through hole 40 to the side of the insulating assembly 4 facing away from the cell bodies 32, to separate the cell bodies 32 from the portion of the conductive portion passing to the side of the insulating assembly 4 facing away from the cell bodies 32, and reduce a probability that the conductive portion is reversely inserted into the cell bodies 32 due to redundancy or the like, thereby reducing a risk of short circuit of the battery cell 102, and improving the use reliability of the battery cell 102.

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

[0249] Referring to FIG. 15 and FIG. 16, in some embodiments of the present application, the insulating assembly 4 includes an insulating film 41. The insulating film 41 completely wraps the cell bodies 32. The insulating film 41 covers all surfaces of the cell bodies 32, so that the insulating film 41 isolates outer surfaces of the cell bodies 32 from the housing assembly 1, to reduce a risk of corrosion of the housing assembly 1 due to exposure of the cell bodies 32, reduce a risk of failure of the cell bodies 32, and reduce risk of electrolyte leakage, thereby improving the reliability and stability of the battery cell 102.

[0250] The through hole 40 is formed at a position of the insulating film 41 opposite to the first housing wall 111, and a portion of the insulating film 41 surrounding the through hole 40 is interposed between the cell bodies 32 and a portion of the tab group 33 passing through the through hole 40 to a side of the insulating film 41 facing the terminal body 21. The portion of the insulating film 41 surrounding the through hole 40 is interposed between the cell bodies 32 and a portion of the tab group 33 passing through the through hole 40 to a side of the insulating film 41 facing away from the cell bodies 32.

[0251] In the foregoing technical solution, because the portion of the insulating film 41 surrounding the through hole 40 is interposed between the cell bodies 32 and the portion of the tab group 33 passing through the through hole 40 to the side of the insulating film 41 facing the terminal body 21, the dimension of the through hole 40 in the insulating film 41 is compatible with the dimension of the tab group 33. For example, the dimension of a first avoidance hole is compatible with a thickness of a portion of the tab group 33 located at the first avoidance hole. In one aspect, the through hole 40 allows the tab group 33 to smoothly pass through to electrically connect to the terminal body 21. In another aspect, when the tab group 33 is in a state of passing through the through hole 40, the insulating film 41 still wraps positions of roots of the plurality of tab pieces 311 of the tab group 33 adjacent to the cell bodies 32, to further provide insulating protection for the cell bodies 32, thereby reducing a risk of exposure of the cell bodies 32. In addition, a portion of the tab group 33 passing through the through hole 40 is separated from the cell bodies 32, to reduce a probability that the tab group 33 and / or the adapter 35 is reversely inserted into the cell bodies 32 and a root of the tab group 33 adjacent to the cell bodies 32 due to redundancy or the like of the tab group 33 and / or the adapter 35, thereby further reducing a risk of short circuit of the battery cell 102.

[0252] In some examples, the through hole 40 in the insulating film 41 is a normally- open hole with a dimension compatible with that of the tab group 33. To be specific, when the insulating film 41 is in a natural state (the insulating film 41 is in a state of not being compressed by the tab group 33), the dimension of the through hole 40 is greater than zero. Therefore, the tab group 33 rapidly passes through the insulating film 41, which is conducive to improving the efficiency of wrapping the cell bodies 32 by the insulating film 41, thereby improving the assembly efficiency of the battery cell 102. In addition, in a process of passing through the insulating film 41, the tab group 33 avoids the insulating film 41, to reduce a probability that the tab group 33 is deformed, and omit an operation step of shaping the tab group 33, thereby improving the assembly efficiency of the battery cell 102.

[0253] In some other examples, a tearable structure 411 is disposed at a position at which the insulating film 41 and the first housing wall 111 are opposite to each other. The tearable structure 411 is suitable for being torn under the action of the tab group 33, to form the through hole 40. For example, in a process of wrapping the insulating film 41 on an outer side of the cell bodies 32, when the tab group 33 pushes open the tearable structure 411 on the insulating film 41, an openable through hole 40 is formed in the insulating film 41, to enable the tab group 33 to smoothly pass through the through hole 40. Because the through hole 40 has an automatic shut-off characteristic, after the tab group 33 has passed in position through the through hole 40, the through hole 40 gradually closes, so that the insulating film 41 covers at least portions of roots of the plurality of tab pieces 311 of the tab group 33 that are adjacent to the cell bodies 32.

[0254] Therefore, the tearable structure 411 is disposed to form insulating protection for the roots of the plurality of tab pieces 311 of the tab group 33 that are adjacent to the cell bodies 32, so that the portion of the tab group 33 passing through the through hole 40 is separated from the roots of the plurality of tab pieces 311 of the tab group 33 that are adjacent to the cell bodies 32, to reduce a probability that the tab group 33 is reversely inserted into the cell bodies 32 due to redundancy and the roots of the plurality of tab pieces 311 of the reversely inserted tab group 33 that are adjacent to the cell bodies 32, thereby reducing a risk of short circuit of the battery cell 102.

[0255] Referring to FIG. 17 to FIG. 20, in some embodiments of the present application, the insulating assembly 4 includes an insulating bracket 42. The insulating bracket 42 is disposed on a side of the cell bodies 32 facing the first housing wall 111, so that the insulating bracket 42 supports the cell bodies 32 and separates the cell bodies 32 from the first housing wall 111, to reduce a probability that the cell bodies 32 are in contact with the first housing wall 111, which is conducive to reducing a risk of corrosion of the first housing wall 111 due to exposure of the cell bodies 32, reducing a risk of electrolyte leakage, and improving the reliability and stability of the battery cell 102.

[0256] The through hole 40 is formed at a position of the insulating bracket 42 opposite to the terminal assembly 2, and a portion of the insulating bracket 42 surrounding the through hole 40 is interposed between the adapter 35 and the cell bodies 32. In this case, the adapter 35 is located on a side of the insulating bracket 42 facing away from the cell bodies 32, and the tab group 33 passes through the through hole 40 in the insulating bracket 42.

[0257] In the foregoing technical solution, because the portion of the insulating bracket 42 surrounding the through hole 40 is interposed between the adapter 35 and the cell bodies 32, the insulating bracket 42 partially supports the adapter 35, and the adapter 35 supports the free end 331 of the tab group 33, so that the insulating bracket 42 insulates the free end 331 of the tab group 33 from the cell bodies 32, to reduce a probability that the free end 331 of the tab group 33 is reversely inserted into the cell bodies 32 and reversely inserted into a root of the tab group 33 adjacent to the cell bodies 32, and reduce a risk of short circuit, thereby improving the reliability of the battery cell 102.

[0258] Further, the insulating bracket 42 abuts against an end of the adapter 35 facing the cell bodies 32, the insulating bracket 42 partially and indirectly supports the free end 331 of the tab group 33 through the adapter 35, so that the reliability of supporting the free end 331 of the tab group 33 is improved, to further reduce a probability that the tab group 33 is reversely inserted into the cell bodies 32 and reversely inserted into a root of the tab group 33 adjacent to the cell bodies 32, and reduce a risk of short circuit, thereby improving the reliability of the battery cell 102.

[0259] Referring to FIG. 17 and FIG. 18, in some embodiments of the present application, the insulating assembly 4 includes the insulating bracket 42. The through hole 40 in the insulating bracket 42 is provided with a first hole wall and a second hole wall that are disposed opposite to each other in a width direction of the terminal body 21. The insulating bracket 42 includes a bracket body 421 and a first separating piece 422. The bracket body 421 is disposed at ends of the cell bodies 32 facing the first housing wall 111. The first separating piece 422 is disposed on the first hole wall, and the first separating piece 422 is connected to the bracket body 421. The first separating piece 422 extends toward a center of the through hole 40. The first separating piece 422 is interposed between the adapter 35 and the cell bodies 32. In this case, the insulating bracket 42 does not include a second separating piece 423 described below.

[0260] It is to be understood that, the first separating piece 422 is parallel to the width direction of the terminal body 21, or is disposed obliquely relative to the width direction of the terminal body 21.

[0261] Referring to FIG. 19 and FIG. 20, in some embodiments of the present application, the insulating assembly 4 includes the insulating bracket 42. The through hole 40 in the insulating bracket 42 is provided with the first hole wall and the second hole wall that are disposed opposite to each other in the width direction of the terminal body 21. The insulating bracket 42 includes the bracket body 421, the first separating piece 422, and the second separating piece 423. The bracket body 421 is disposed at the ends of the cell bodies 32 facing the first housing wall 111. The first separating piece 422 is disposed on the first hole wall, and the first separating piece 422 is connected to the bracket body 421. The first separating piece 422 extends toward the center of the through hole 40. The first separating piece 422 is interposed between the adapter 35 and the cell bodies 32. The second separating piece 423 is disposed at the second hole wall, and the second separating piece 423 is connected to the bracket body 421. The second separating piece 423 extends toward the center of the through hole 40. It is learned that, the first separating piece 422 and the second separating piece 423 are spaced apart, to form the through hole 40 between the first separating piece 422 and the second separating piece 423.

[0262] It is to be understood that, the second separating piece 423 is parallel to the width direction of the terminal body 21, or is disposed obliquely relative to the width direction of the terminal body 21.

[0263] In some embodiments of the present application, the insulating assembly 4 includes the insulating film 41 and the insulating bracket 42. The insulating film 41 completely wraps the cell bodies 32. The through hole 40 is formed at the position of the insulating film 41 opposite to the first housing wall 111, and the portion of the insulating film 41 surrounding the through hole 40 is interposed between the cell bodies 32 and the portion of the tab group 33 passing through the through hole 40 to the side of the insulating film 41 facing the terminal body 21. The insulating bracket 42 is disposed on the side of the cell bodies 32 facing the first housing wall 111. The through hole 40 is formed at the position of the insulating bracket 42 opposite to the terminal assembly 2. The portion of the insulating bracket 42 surrounding the through hole 40 is interposed between the adapter 35 and the cell bodies 32. The through hole 40 in the insulating bracket 42 and the through hole 40 in the insulating film 41 are disposed opposite to each other. The insulating bracket 42 covers at least a portion of the insulating film 41 at an end of the cell bodies 32 facing the first housing wall 111.

[0264] An insulating member is disposed between the terminal body 21 and the first housing wall 111, to achieve insulation between the first housing wall 111 and the terminal body 21. For example, the insulating member is a portion (for example, an insulating structure 23) of the terminal assembly 2. For another example, the insulating member is disposed between the terminal assembly 2 and the housing assembly 1.

[0265] Referring to FIG. 21 to FIG. 24, in some embodiments of the present application, the terminal assembly 2 further includes an adapter structure 22 and an insulating structure 23, the adapter structure 22 surrounds the terminal body 21, the adapter structure 22 is connected to the first housing wall 111, and the insulating structure 23 is fitted between the adapter structure 22 and the terminal body 21 in an insulating manner.

[0266] The adapter structure 22 surrounds the entire circumference of the terminal body 21 in a circumferential direction of the mounting hole 112, so that the adapter structure 22 connects the terminal body 21 to the first housing wall 111 in a peripheral region of the terminal body 21. The insulating structure 23 insulates a fitting position between the adapter structure 22 and the terminal body 21, to prevent conduction and short circuit between the terminal body 21 and the adapter structure 22. A connection manner between the adapter structure 22 and the first housing wall 111 is not limited, and is, for example, welding, riveting, punching, or bonding.

[0267] In the foregoing technical solution, the terminal assembly 2 has a simple structure and is easy to process. Because the terminal assembly 2 includes the terminal body 21 and the adapter structure 22, the shape and dimension of the terminal body 21 and the shape and dimension of the adapter structure 22 are separately designed based on different factors, to flexibly adapt to connection requirements for housing assemblies 1 and cell assemblies 3 in different forms, thereby expanding the application range of the terminal assembly 2.

[0268] For example, the shape of the adapter structure 22 is configured to match that of the mounting hole 112. The shape of the mounting hole 112 is designed into an elongated shape that facilitates passing of the terminal assembly 2 and achieves a small tilt angle of the terminal assembly 2. In addition, the terminal body 21 is designed into an elongated shape that matches the shape of the adapter structure 22, so that the terminal body 21 has a large area for connection to the adapter 35, or the terminal body 21 is designed into a circular shape that does not match the shape of the adapter structure 22, which is conducive to reducing a connection area between the terminal body 21 and the adapter structure 22, so that the uniformity of force bearing at the connection between the terminal body 21 and the adapter structure 22 is improved, thereby improving the connection reliability between the terminal body 21 and the adapter structure 22.

[0269] For example, the adapter structure 22 is formed as an elongated shape (for example, a rectangular shape or racetrack shape) extending in a length direction of the first housing wall 111, and a contour shape of the terminal body 21 matches a contour shape of the adapter structure 22 (for example, a rectangular shape or racetrack shape). As discussed above, the cell assembly 3 is connected to the terminal assembly 2 by the conductive portion 4. When the contour shape of the terminal body 21 is formed as an elongated shape matching the contour shape of the adapter structure 22, an area of the terminal body 21 is large, which is conducive to increasing a connection area between the adapter 35 and the terminal body 21, thereby improving the electrical conductivity.

[0270] For example, when the terminal assembly 2 includes the terminal body 21, the adapter structure 22, and the insulating structure 23, in the assembly process of the battery cell 102, "connecting the cell assembly 3 to the terminal assembly 2" specifically includes: connecting the cell assembly 3 to the terminal body 21, such that the terminal assembly 2 connected to the cell assembly 3 is disposed at the mounting hole 112, and the adapter structure 22 is connected to the first housing wall 111.

[0271] Referring to FIG. 21 to FIG. 24, in some embodiments of the present application, the insulating structure 23 is further fitted between the adapter structure 22 and the terminal body 21 in a sealed manner. Therefore, the insulating structure 23 insulates the adapter structure 22 from the terminal body 21, and also enables the fitting position between the adapter structure 22 and the terminal body 21 to be in a sealed state, to isolate the inside and outside of the housing assembly 1 after the adapter structure 22 is connected to the first housing wall 111, reduce a risk of an electrolyte solution in the housing assembly 1 leaking outside the housing assembly 1 from the fitting position between the adapter structure 22 and the terminal body 21, and reduce a risk of liquid, dust, or the like outside the housing assembly 1 entering the housing assembly 1 from the fitting position between the adapter structure 22 and the terminal body 21, thereby improving the reliability of the battery cell 102.

[0272] In the foregoing technical solution, because the insulating structure 23 is further fitted between the adapter structure 22 and the terminal body 21 in a sealed manner, so that when the terminal assembly 2 is mounted to the first housing wall 111 and the adapter structure 22 is connected to the first housing wall 111, a sealing member or the like no longer needs to be disposed between the adapter structure 22 and the first housing wall 111, and a large sealing pressure does not need to be applied to meet a compression degree of the sealing member at the position, to reduce a force acting on the first housing wall 111 to protect the housing assembly 1, which is conducive to reducing a wall thickness of the housing assembly 1, thereby reducing material costs. In addition, because the first housing wall 111 is an end of a housing body 11 opposite to an opening 113, so that a force acting on a connection between the first housing wall 111 and a second housing wall 114 is reduced, and a force acting on the second housing wall 114 is reduced, which is conducive to ensuring the reliability of the housing body 11, thereby reducing a wall thickness and costs of the housing body 11.

[0273] Referring to FIG. 21 to FIG. 24 again, in some embodiments of the present application, the insulating structure 23 includes a sealing structural member 231. In the embodiments of the present application, the sealing structural member 231 is made of a material with sealing and insulating properties, and is, for example, an elastic rubber member.

[0274] Referring to FIG. 21 to FIG. 24 again, for example, at least a portion of the sealing structural member 231 is clamped between the adapter structure 22 and the terminal body 21 in an inner-outer direction (for example, the fifth direction) of the first housing wall 111.

[0275] In the embodiments of the present application, a direction from an inner side of the first housing wall 111 to an outer side of the first housing wall 111 and a direction from the outer side of the first housing wall 111 to the inner side of the first housing wall 111 are generally referred to as "the inner-outer direction (for example, the fifth direction) of the first housing wall 111". "The inner side of the first housing wall 111" is a side of the first housing wall 111 facing the cell assembly 3, and "the outer side of the first housing wall 111" is a side of the first housing wall 111 facing away from the cell assembly 3.

[0276] The sealing structural member 231 at least includes an axial side portion 231a. A side of the axial side portion 231a facing the accommodating cavity 13 is an inner side of the axial side portion 231a. A side of the axial side portion 231a facing away from the cell assembly 3 is an outer side of the axial side portion 231a. One of the adapter structure 22 and the terminal body 21 is partially clamped on the outer side of the axial side portion 231a, and the other is partially clamped on the inner side of the axial side portion 231a, so that the axial side portion 231a is clamped between the adapter structure 22 and the terminal body 21 in the inner-outer direction (for example, the fifth direction F5) of the first housing wall 111, thereby achieving the axial sealing between the adapter structure 22 and the terminal body 21.

[0277] Therefore, at least a portion of the sealing structural member 231 is clamped between the adapter structure 22 and the terminal body 21 in the inner-outer direction (for example, the fifth direction F5) of the first housing wall 111, so that the adapter structure 22 and the terminal body 21 are axially sealed, to achieve a reliable sealing effect through axial sealing, thereby mitigating a leakage problem at a fitting position between the adapter structure 22 and the terminal body 21. In addition, in the embodiments of the present application, axial sealing (for example, the axial side portion 231a) is integrated into the terminal assembly, thereby reducing an axial force acting on the first housing wall 111.

[0278] Referring to FIG. 21 to FIG. 24 again, for example, the sealing structural member 231 is disposed around a peripheral side (namely, an inner ring of the adapter structure 22) of the adapter structure 22 facing the terminal body 21. In the embodiments of the present application, because the adapter structure 22 surrounds the terminal body 21 and is connected to the first housing wall 111, a peripheral side of the adapter structure 22 facing the terminal body 21 is "an inner ring 2211 of the adapter structure 22", and a peripheral side of the adapter structure 22 facing the first housing wall 111 is "an outer ring 2212 of the adapter structure 22". In the foregoing technical solution, the sealing structural member 231 is disposed around an inner ring of the adapter structure 22, and the sealing structural member 231 is closer to the fitting position between the adapter structure 22 and the terminal body 21, which is conducive to achieving sealing at the fitting position between the adapter structure 22 and the terminal body 21 with a reduced path length, thereby improving sealing reliability, and is conducive to reducing the dimension of the sealing structural member 231, thereby reducing a sealing area, so that it is easy to achieve compression sealing of the sealing structural member 231, and sealing is not prone to failure, thereby improving the sealing effect.

[0279] In addition, when the insulating structure 23 includes the sealing structural member 231, the sealing structural member 231 is clamped between the adapter structure 22 and the terminal body 21, such that the adapter structure 22 and the terminal body 21 are fitted in a sealed manner, and the adapter structure 22 is formed as an elongated shape extending in the length direction of the first housing wall 111. When the terminal body 21 is disposed at a central position of the adapter structure 22 in a length direction and has a circular shape, because a connection position between the adapter structure 22 and the terminal body 21 is subjected to a uniform force, it is easy to control a compression amount of the sealing structural member 231, thereby improving the reliability of the sealed fit between the adapter structure 22 and the terminal body 21, and the sealing area is relatively small, so that the sealed fit is not prone to failure.

[0280] Referring to FIG. 21 to FIG. 24 again, in some embodiments of the present application, the terminal body 21 includes a peripheral portion 212, the adapter structure 22 is clamped on two sides of the peripheral portion 212 in the inner-outer direction of the first housing wall 111 through the insulating structure 23, and at least a portion of the sealing structural member 231 is clamped between the adapter structure 22 and a side of the peripheral portion 212 facing the cell assembly 3.

[0281] In this embodiment, the peripheral portion 212 is a peripheral structure of the terminal body 21. Because the sealing structural member 231 is disposed around the peripheral side of the adapter structure 22 facing the terminal body 21, the sealing structural member 231 is clamped between the peripheral portion 212 and the adapter structure 22.

[0282] In this embodiment, a side of the peripheral portion 212 facing away from the cell assembly 3 is an outer side of the peripheral portion 212, and a side of the peripheral portion 212 facing the accommodating cavity 13 is an inner side of the peripheral portion 212. The adapter structure 22 is limited on the outer side of the peripheral portion 212 through the insulating structure 23, to restrict the terminal body 21 from moving away from the cell assembly 3 relative to the adapter structure 22, and the adapter structure 22 is further limited on the inner side of the peripheral portion 212 through the insulating structure 23, to restrict the terminal body 21 from moving toward the accommodating cavity 13 relative to the adapter structure 22, so that the adapter structure 22 is clamped on the two sides of the peripheral portion 212 in the inner-outer direction (for example, the fifth direction F5) of the first housing wall 111 through the insulating structure 23.

[0283] In the foregoing technical solution, the terminal assembly 2 has a simple structure and is easy to process, so that relative fixation and insulating fitting of the terminal body 21 and the adapter structure 22 are readily and effectively achieved. In addition, the peripheral portion 212 of the terminal body 21 and the adapter structure 22 are used to clamp the sealing structural member 231, and the sealing structural member 231 is at the fitting position between the adapter structure 22 and the terminal body 21, which is conducive to achieving sealing at the fitting position between the adapter structure 22 and the terminal body 21 with a reduced path length, thereby improving sealing reliability, and is conducive to reducing the dimension of the sealing structural member 231, thereby reducing a sealing area, so that it is easy to achieve compression sealing of the sealing structural member 231, and sealing is not prone to failure, thereby improving the sealing effect. In addition, because at least a portion of the sealing structural member 231 is clamped between the adapter structure 22 and the side of the peripheral portion 212 facing the cell assembly 3, the sealing structural member 231 achieves sealing from a side of the peripheral portion 212 facing the accommodating cavity 13, so that an electrolyte solution is prevented more effectively from leaking from the fitting position between the terminal body 21 and the adapter structure 22, thereby improving a sealing effect.

[0284] Referring to FIG. 24 again, for example, the insulating structure 23 further includes a first insulating member 232. The adapter structure 22 is clamped on the two sides of the peripheral portion 212 in the inner-outer direction (for example, the fifth direction F5) of the first housing wall 111 through the first insulating member 232 and the sealing structural member 231, respectively. In this embodiment, the structure of the adapter structure 22 is not limited, and the adapter structure 22 is an individual part or a combination of a plurality of (for example, two and more) parts.

[0285] Because at least a portion (for example, the axial side portion 231a) of the sealing structural member 231 is disposed on the side of the peripheral portion 212 facing the cell assembly 3, at least a portion of the first insulating member 232 is disposed on the side of the peripheral portion 212 facing away from the cell assembly 3. The adapter structure 22 is clamped on the two sides of the peripheral portion 212 in the inner-outer direction (for example, the fifth direction F5) of the first housing wall 111 through the first insulating member 232 and the sealing structural member 231, respectively.

[0286] In the foregoing technical solution, because the insulating structure 23 includes the first insulating member 232 and the sealing structural member 231 that are not integrated into an integrally formed member, thereby simplifying the design and processing of the insulating structure 23. In addition, according to a specific fitting requirement of the terminal body 21 and the adapter structure 22, the first insulating member 232 is disposed as an insulating member (for example, a plastic member) that is basically not compressible and does not have a sealing effect, or the first insulating member 232 is disposed as a sealing member (for example, an elastic rubber member) that is compressible and has a sealing effect, thereby meeting different actual requirements. In addition, when the first insulating member 232 is an insulating member (for example, a plastic member) that is basically not compressible and does not have a sealing effect, it is easy to control the compression amount of the sealing structural member 231, thereby improving a sealing effect.

[0287] Alternatively, in some other embodiments of the present application, the sealing structural member 231 is alternatively an integral structural member and wraps the peripheral portion 212, to be respectively located on the side of the peripheral portion 212 facing the cell assembly 3 and the side of the peripheral portion 212 facing away from the cell assembly 3. The adapter structure 22 is clamped on the two sides of the peripheral portion 212 in the inner-outer direction (for example, the fifth direction F5) of the first housing wall 111 through the sealing structural member 231. In other words, the sealing structural member 231 is an integral ring-shaped structural member, to be specific, has both insulating and sealing properties. The sealing structural member 231 includes the axial side portions 231a that are respectively located on the inner side and the outer side of the peripheral portion 212. In this way, the adapter structure 22 is clamped on the two sides of the peripheral portion 212 in the inner-outer direction (for example, the fifth direction F5) of the first housing wall 111 through the two axial side portions 231a of the sealing structural member 231. In the foregoing technical solution, because the sealing structural member 231 is an integral structural member and wraps the peripheral portion 212, so that a quantity of parts is reduced, thereby simplifying an assembly procedure.

[0288] Referring to FIG. 21 to FIG. 24 again, in some embodiments of the present application, the adapter structure 22 includes a first adapter ring 221 and a second adapter ring 222. The second adapter ring 222 is disposed on a side of the first adapter ring 221 facing away from the cell assembly 3. The second adapter ring 222 is connected to the first adapter ring 221, and the first adapter ring 221 is connected to the first housing wall 111. The sealing structural member 231 is clamped between the first adapter ring 221 and the peripheral portion 212. The second adapter ring 222 is insulated from and in a fixed fit with the peripheral portion 212 through the first insulating member 232.

[0289] For example, the first adapter ring 221 is connected to the second adapter ring 222 by welding, riveting, punching, or bonding. For example, an outer ring of one of the first adapter ring 221 and the second adapter ring 222 is connected to the first housing wall 111 by welding, riveting, punching, or bonding. For example, 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 housing wall 111 are both made of aluminum and connected by welding, which is conducive to improving a welding yield.

[0290] Therefore, the adapter structure 22 includes the first adapter ring 221 and the second adapter ring 222 that are disposed inside and outside and are assembled and connected, thereby facilitating assembly and connection of the adapter structure 22 to the insulating structure 23 and the terminal body 21, so that the terminal assembly 2 is easy to process and manufacture, and it is easy to control the compression amount of the sealing structural member 231, thereby improving sealing reliability.

[0291] A manner in which the second adapter ring 222 is insulated from and in a fixed fit with the peripheral portion 212 through the first insulating member 232 is not limited. For example, referring to FIG. 21 to FIG. 24 again, the first insulating member 232 is connected to the second adapter ring 222 through injection molding connect. For another example, FIG. 25 is a cross-sectional view of a terminal assembly according to some embodiments of the present application. The second adapter ring 222 includes a stop ring portion 2221. At least a portion of the first insulating member 232 is clamped between the stop ring portion 2221 and the peripheral portion 212 in the inner-outer direction (for example, the fifth direction F5) of the first housing wall 111. A material of the first insulating member 232 is not limited, and is, for example, a plastic member or an elastic rubber member.

[0292] Referring to FIG. 24 again, for example, the adapter structure 22 further includes a first insulating frame 224. The first insulating frame 224 is connected to a side of the first adapter ring 221 facing the cell assembly 3. Therefore, the first insulating frame 224 is used to provide insulation between the cell assembly 3 and the first adapter ring 221, thereby simplifying the arrangement of the insulating structure at this position. For example, the first insulating frame 224 is provided with pin, the first adapter ring 221 is provided with a receiving hole, and the pin is in an interference fit with the receiving hole, to connect the first insulating frame 224 to the first adapter ring 221.

[0293] FIG. 26 is a cross-sectional view of a terminal assembly according to some embodiments of the present application. In some embodiments of the present application, the adapter structure 22 includes a third adapter ring 223. The third adapter ring 223 includes an inner extension portion 2231 and an outer extension portion 2232 that are integrally disposed. In other words, the inner extension portion 2231 and the outer extension portion 2232 are different portions that are integrally formed rather than two separate parts that are assembled and connected.

[0294] An end portion (namely, an inner ring of the inner extension portion 2231) of the inner extension portion 2231 facing the terminal body 21 and an end portion (namely, an inner ring of the outer extension portion 2232) of the outer extension portion 2232 facing the terminal body 21 are spaced apart in the inner-outer direction, and are clamped on the two sides of the peripheral portion 212 in the inner-outer direction (for example, the fifth direction F5) of the first housing wall 111 through the insulating structure 23, respectively. The sealing structural member 231 is clamped between the inner extension portion 2231 and the peripheral portion 212, and the outer extension portion 2232 is insulated from and in a fixed fit with the peripheral portion 212 through the first insulating member 232.

[0295] A connection manner between the third adapter ring 223 and the first housing wall 111 is not limited, and is, for example, welding, riveting, punching, or bonding. For example, the third adapter ring 223 and the first housing wall 111 are both made of aluminum and connected by welding, which is conducive to improving a welding yield.

[0296] A manner in which the outer extension portion 2232 is insulated from and in a fixed fit with the peripheral portion 212 through the first insulating member 232 is not limited. For example, referring to FIG. 26 again, the outer extension portion 2232 rivets, abuts, and presses the first insulating member 232 on the peripheral portion 212. For another example, FIG. 27 is a cross-sectional view of a terminal assembly according to some embodiments of the present application. The first insulating member 232 and the terminal body 21 as well as the first insulating member 232 and the outer extension portion 2232 are connected through injection molding. The inner extension portion 2231 rivets, abuts, and presses the sealing structural member 231 on the peripheral portion 212.

[0297] For example, referring to FIG. 27 again, the adapter structure 22 further includes a second insulating frame 225. The second insulating frame 225 is connected to a side of the third adapter ring 223 facing the cell assembly 3. Therefore, the second insulating frame 225 is used to provide insulation between the cell assembly 3 and the third adapter ring 223, thereby omitting the arrangement of the insulating structure at this position. For example, the second insulating frame 225 is provided with pin, the third adapter ring 223 is provided with a receiving hole, and the pin is in an interference fit with the receiving hole, to connect the second insulating frame 225 to the third adapter ring 223.

[0298] Referring to FIG. 28 and FIG. 29, in some embodiments of the present application, the adapter structure 22 includes a mating ring portion 2271, the terminal body 21 includes a penetrating portion 214 passing through the mating ring portion 2271 and an inner limiting portion 215 and an outer limiting portion 216 that are connected to the penetrating portion 214 and clamped on two sides of the mating ring portion 2271, and at least a portion of the sealing structural member 231 is clamped between the mating ring portion 2271 and the inner limiting portion 215.

[0299] For example, the adapter structure 22 includes a fourth adapter ring 227. The fourth adapter ring 227 includes a mating ring portion 2271, and the fourth adapter ring 227 is connected to the first housing wall 111. For example, an outer ring of the fourth adapter ring 227 is connected to the first housing wall 111. A connection manner between the fourth adapter ring 227 and the first housing wall 111 is not limited, and is, for example, welding, riveting, punching, or bonding. For example, the fourth adapter ring 227 and the first housing wall 111 are both made of aluminum and connected by welding, which is conducive to improving a welding yield.

[0300] In the foregoing technical solution, the terminal assembly 2 has a simple structure and is easy to process, so that relative fixation and insulating fitting of the terminal body 21 and the adapter structure 22 are readily and effectively achieved. In addition, the sealing structural member 231 is clamped at a fitting position between the terminal body 21 and the mating ring portion 2271, and the sealing structural member 231 is at the fitting position between the adapter structure 22 and the terminal body 21, which is conducive to achieving sealing at the fitting position between the adapter structure 22 and the terminal body 21 with a reduced path length, thereby improving sealing reliability, and is conducive to reducing the dimension of the sealing structural member 231, thereby reducing a sealing area, so that it is easy to achieve compression sealing of the sealing structural member 231, and sealing is not prone to failure, thereby improving the sealing effect. In addition, because at least a portion of the sealing structural member 231 is clamped between the mating ring portion 2271 and inner limiting portion 215, the sealing structural member 231 achieves sealing from a side of the mating ring portion 2271 facing the accommodating cavity 13, so that an electrolyte solution is prevented more effectively from leaking from the fitting position between the terminal body 21 and the adapter structure 22, thereby improving a sealing effect.

[0301] Referring to FIG. 28 again, the insulating structure 23 further includes a second insulating member 234. At least a portion of the sealing structural member 231 is clamped between the inner limiting portion 215 and the mating ring portion 2271, At least a portion of the second insulating member 234 is clamped between the outer limiting portion 216 and the mating ring portion 2271.

[0302] In the foregoing technical solution, because the insulating structure 23 includes the second insulating member 234 and the sealing structural member 231 that are not integrated into an integrally formed member, thereby simplifying the design and processing of the insulating structure 23. In addition, according to a specific fitting requirement of the terminal body 21 and the adapter structure 22, the second insulating member 234 is disposed as an insulating member (for example, a plastic member) that is basically not compressible and does not have a sealing effect, or the second insulating member 234 is disposed as a sealing member (for example, an elastic rubber member) that is compressible and has a sealing effect, thereby meeting different actual requirements. In addition, when the second insulating member 234 is an insulating member (for example, a plastic member) that is basically not compressible and does not have a sealing effect, it is easy to control the compression amount of the sealing structural member 231, thereby improving a sealing effect.

[0303] Alternatively, referring to FIG. 29, in some other embodiments of the present application, the sealing structural member 231 is alternatively an integral structural member and surrounds the mating ring portion 2271, to be respectively located on the side of the mating ring portion 2271 facing the cell assembly 3 and the side of the mating ring portion 2271 facing away from the cell assembly 3. The terminal body 21 is clamped on the two sides of the mating ring portion 2271 in the inner-outer direction (for example, the fifth direction F5) of the first housing wall 111 through the sealing structural member 231. In other words, the sealing structural member 231 is an integral ring-shaped structural member, to be specific, has both insulating and sealing properties. The sealing structural member 231 includes the axial side portions 231a that are respectively located on the inner side and the outer side of the mating ring portion 2271. In this way, the adapter structure 22 is clamped on the two sides of the mating ring portion 2271 in the inner-outer direction (for example, the fifth direction F5) of the first housing wall 111 through the two axial side portions 231a of the sealing structural member 231. In the foregoing technical solution, because the sealing structural member 231 is an integral structural member and wraps the mating ring portion 2271, so that a quantity of parts is reduced, thereby simplifying an assembly procedure.

[0304] In the embodiments of the present application, when the terminal body 21 includes the penetrating portion 214 and the inner limiting portion 215 and the outer limiting portion 216 that are connected to the penetrating portion 214 and clamped on the two sides of the mating ring portion 2271, the structure of the terminal body 21 is not limited, and the terminal body 21 is an individual part or a combination of a plurality of (for example, two and more) parts.

[0305] For example, referring to FIG. 28 again, the outer limiting portion 216 and the penetrating portion 214 are assembled and connected on a side of the mating ring portion 2271 facing away from the inner limiting portion 215. A manner in which the outer limiting portion 216 and the penetrating portion 214 are assembled and connected is not limited, and is, for example, welding, punching, or bonding. The assembly and connection are that two members are connected through a connection procedure. Therefore, the outer limiting portion 216 and the penetrating portion 214 are disposed as split members and are assembled and connected. The terminal body 21 has a simple structure, and is easily assembled and connected to the adapter structure 22. In addition, when the outer limiting portion 216 is welded to the penetrating portion 214, the thermal impact caused by the sealing structural member 231 clamped between the inner limiting portion 215 and the mating ring portion 227 is reduced, thereby improving the sealing reliability of the sealing structural member 231.

[0306] In the foregoing embodiment, a connection manner between the penetrating portion 214 and the inner limiting portion 215 is not limited, and the penetrating portion 214 and the inner limiting portion 215 are integrally formed, or are split members and preconnected. For example, an end of the penetrating portion 214 facing away from the inner limiting portion 215 includes a riveting portion 2141. During assembly, the penetrating portion 214 is passed in a direction from the inner limiting portion 215 to the outer limiting portion 216 through the mating ring portion 2271 fitted with the insulating structure 23, then the riveting portion 2141 is riveted to restrict the penetrating portion 214 from disengaging in a direction from the outer limiting portion 216 to the inner limiting portion 215, and subsequently the riveting portion 2141 is connected to the outer limiting portion 216, thereby facilitating the connection, for example, welding, of the penetrating portion 214 and the outer limiting portion 216. Alternatively, the riveting portion 2141 is omitted, thereby omitting a riveting process after the penetrating portion 214 has passed through.

[0307] For example, with reference to FIG. 29 again, in some other embodiments of the present application, the outer limiting portion 216 and the penetrating portion 214 are integrally formed, and the outer limiting portion 216 rivets, abuts, and presses the second insulating member 234 on the mating ring portion 2271. In the foregoing technical solution, the outer limiting portion 216 is assembled and connected to the insulating structure 23 and the adapter structure 22 by riveting, to reduce the thermal impact caused to the sealing structural member 231 by heat generated when the outer limiting portion 216 is connected to the insulating structure 23 and the adapter structure 22, thereby improving the sealing reliability of the sealing structural member 231. In addition, the second insulating member 234 abuts and presses the mating ring portion 2271 through the riveting of the outer limiting portion 216, so that it is easy to control the compression amount of the sealing structural member 231, thereby achieving a good compression effect.

[0308] In the foregoing embodiment, a connection manner between the penetrating portion 214 and the inner limiting portion 215 is not limited, and the penetrating portion 214 and the inner limiting portion 215 are integrally formed, or are split members and preconnected. For example, during assembly, the penetrating portion 214 is passed in the direction from the inner limiting portion 215 to the outer limiting portion 216 through the mating ring portion 2271 fitted with the insulating structure 23, and then the outer limiting portion 216 is riveted, to restrict the relative movement between the terminal assembly 21 and the adapter structure 22.

[0309] The terminal body 21 is a solid structure or a hollow structure. For example, when the terminal body 21 is a hollow structure, referring to FIG. 29, the terminal body 21 includes a first terminal member 21a and a second terminal member 21b. The second terminal member 21b is formed by the penetrating portion 214, the inner limiting portion 215, and the outer limiting portion 216, and is mounted on the first housing wall 111. The penetrating portion 214 surrounds a fitting hole 21b1 penetrating in the inner-outer direction of the first housing wall 111, and the first terminal member 21a is assembled on a side of the second terminal member 21b facing away from the cell assembly 3 and covers the fitting hole 21b1, to form, between the first terminal member 21a and the second terminal member 21b, the accommodating space that opens toward the cell assembly 3. The conductive portion 4 partially extends into the accommodating space and is connected to the first terminal member 21a, so that the terminal body 21 accommodates the conductive portion 4, to reduce the space occupation of the conductive portion 4 in the accommodating cavity 13, which is conducive to improving the energy density of the battery cell 102.

[0310] Referring to FIG. 28 again, in some embodiments of the present application, the adapter structure 22 further includes a third insulating frame 228. The third insulating frame 228 is connected to a side of the fourth adapter ring 227 facing the cell assembly 3. Therefore, the third insulating frame 228 is used to provide insulation between the cell assembly 3 and the fourth adapter ring 227, thereby omitting the arrangement of the insulating structure at this position. For example, the third insulating frame 228 is provided with a pin, the fourth adapter ring 227 is provided with a receiving hole, and the pin is in an interference fit with the receiving hole, to connect the third insulating frame 228 to the fourth adapter ring 227.

[0311] Referring to FIG. 30, in some embodiments of the present application, the first housing wall 111 is provided with the mounting hole 112, a sealing ring 14 surrounds the mounting hole 112, and the sealing ring 14 is clamped between the terminal assembly 2 and the first housing wall 111. Therefore, the terminal assembly 2 has a simple structure and is easy to process, and it is easy to assemble and connect the terminal assembly 2 and the first housing wall 111.

[0312] In some embodiments of the present application, the first housing wall 111 is provided with the mounting hole 112, the terminal assembly 2 covers the mounting hole 112, and an edge of the adapter structure 22 is lapped on a side of the first housing wall 111 in a wall thickness direction. In this way, the adapter structure 22 covers the side of the first housing wall 111 in the wall thickness direction. To be specific, the adapter structure 22 covers the outer side of the first housing wall 111, or covers the inner side of the first housing wall 111, thereby facilitating the assembly of the adapter structure 22 and the first housing wall 111.

[0313] For example, the adapter structure 22 is connected to the first housing wall 111 by welding. For example, after the adapter structure 22 covers the first housing wall 111, the adapter structure 22 is connected to the first housing wall 111 by welding, so that processing is facilitated, and the connection reliability between the adapter structure 22 and the first housing wall 111 is adequately ensured. For example, welding is performed on the outer side of the first housing wall 111, such that a weld seam formed from the connection of the adapter structure 22 and the first housing wall 111 is exposed from the side (namely, a side facing away from the cell bodies 32) of the first housing wall 111 facing away from the cell assembly 3, thereby facilitating welding operations, and expanding a welding space. The present application is not limited thereto. For example, in some other embodiments of the present application, the adapter structure 22 is disposed passing through the mounting hole 112, connected to the first housing wall 111 by riveting, or the like.

[0314] FIG. 31 shows a state of the terminal assembly 2 before covering the first housing wall 111. FIG. 32 is a diagram of a state of the terminal assembly 2 shown in FIG. 31 after covering the first housing wall 111.

[0315] Referring to FIG. 31 and FIG. 32, in some embodiments, when the cell assembly 3 is first connected to the terminal assembly 2 and then the terminal assembly 2 is assembled and connected to the first housing wall 111, after the cell assembly 3 is connected to the terminal assembly 2 (for example, the terminal assembly 2 and the cell assembly 3 are first connected and then mounted together into the housing body 11, and then the terminal assembly 2 extends outside the first housing wall 111 from the mounting hole 112; or for still another example, the cell assembly 3 is mounted into the housing body 11, and the conductive portion 4 passes through the mounting hole 112 and is connected to the terminal assembly 2 disposed in advance on the outer side of the first housing wall 111), the terminal assembly 2 covers the mounting hole 112 of the first housing wall 111 from the outer side (namely, the side facing away from the cell bodies 32) of the first housing wall 111. In this case, the edge of the adapter structure 22 is lapped on the side of the first housing wall 111 facing away from the cell assembly 3. Therefore, because the terminal assembly 2 covers the first housing wall 111 from the outer side, thereby facilitating the assembly and connection of the terminal assembly 2 and the first housing wall 111, which is conducive to improving the connection reliability between the terminal assembly 2 and the first housing wall 111.

[0316] Referring to FIG. 31 and FIG. 32, in some embodiments of the present application, when the edge of the adapter structure 22 is lapped on the side of the first housing wall 111 facing away from the cell assembly 3, a first recess 1111 disposed around the mounting hole 112 is provided in the first housing wall 111. The first recess 1111 opens away from the cell assembly 3 (in other words, the first recess 1111 opens away from the cell bodies 32). The edge of the adapter structure 22 is embedded in the first recess 1111. The edge of the adapter structure 22 is provided with a flange portion 22a surrounding the adapter structure 22, and the flange portion 22a is embedded in the first recess 1111. Therefore, the connection between the adapter structure 22 and the first housing wall 111 is supported and positioned, which is conducive to the connection of the adapter structure 22 and the first housing wall 111 from the outer side (namely, the side facing away from the cell bodies 32) of the first housing wall 111 by welding.

[0317] Referring to FIG. 31 and FIG. 32 again, for example, a thickness of the flange portion 22a matches a recess depth T1 of the first recess 1111. "Matching" is that the thickness of the flange portion 22a is basically consistent with the recess depth of the first recess 1111. Therefore, the welding of the flange portion 22a and the first housing wall 111 is facilitated, so that the thickness of the flange portion 22a is not excessively large relative to the recess depth of the first recess 1111, thereby avoiding unnecessary space occupation, and the thickness of the flange portion 22a is not excessively small relative to the recess depth of the first recess 1111, thereby meeting a welding strength requirement.

[0318] With reference to FIG. 31 to FIG. 33, in some embodiments of the present application, the mounting hole 112 is an elongated (for example, rectangular, elliptical or racetrack-shaped) hole, and the terminal assembly 2 is formed as an elongated (for example, rectangular, elliptical, or racetrack-shaped) structure matching the shape of the mounting hole 112. The cell assembly 3 is first connected to the terminal assembly 2, and then terminal assembly 2 and the cell assembly 3 are mounted together into the housing body 11. Next, the terminal assembly 2 extends to the outer side of the first housing wall 111 from the mounting hole 112. Subsequently, the terminal assembly 2 is tilted from the outer side of the first housing wall 111 to make the terminal assembly 2 cover the mounting hole 112, and then the terminal assembly 2 is connected to the first housing wall 111. In this case, if the terminal assembly 2 is disposed as an elongated structure matching the shape of the mounting hole 112, the terminal assembly 2 is adjusted to enable a thickness direction of the terminal assembly 2 to approach a width direction (the second direction F2 shown in FIG. 33) of the mounting hole 112 to pass through mounting hole 112. After the terminal assembly 2 passes through the mounting hole 112, and then the thickness direction of the terminal assembly 2 is rotated to approach the thickness direction of the first housing wall 111 (the first direction F1 shown in FIG. 33). In this way, a space required for the tilting of the terminal assembly 2 is small, so that the space required for the tilting of the terminal assembly 2 is reduced, which is conducive to reducing the length of the conductive portion 4, thereby saving materials and reducing costs. In addition, the redundancy of the conductive portion 4 is reduced, and the space occupation of the conductive portion 4 in the accommodating cavity 13 is reduced, which is conducive to improving the energy density of the battery cell 102.

[0319] Referring to FIG. 33 and FIG. 34, in some embodiments, when the cell assembly 3 is first connected to the terminal assembly 2 and then the terminal assembly 2 is assembled and connected to the first housing wall 111, after the cell assembly 3 is connected to the terminal assembly 2, the cell assembly 3 and the terminal assembly 2 are mounted together into the housing body 11. In this way, the terminal assembly 2 covers the mounting hole 112 of the first housing wall 111 from the inner side (namely, the side facing the cell bodies 32) of the first housing wall 111. In this case, the edge of the adapter structure 22 is lapped on the side of the first housing wall 111 facing the cell assembly 3. Therefore, because the terminal assembly 2 is disposed in the mounting hole 112 from the inner side of the first housing wall 111, the cell assembly 3 and the terminal assembly 2 are mounted together into the housing body 11, and the terminal assembly 2 does not need to pass through the mounting hole 112, thereby reducing operation steps, and reducing operation difficulty.

[0320] Referring to FIG. 33 and FIG. 34, in some embodiments of the present application, when the edge of the adapter structure 22 is lapped on the side of the first housing wall 111 facing the cell assembly 3, the edge of the adapter structure 22 is provided with a second recess 22b opens away from the cell assembly 3 (in other words, the second recess 22b opens away from the cell bodies 32). The first housing wall 111 includes a lap portion 1112 protruding into the mounting hole 112. The lap portion 1112 is embedded in the second recess 22b. Therefore, the connection between the terminal assembly 2 and the first housing wall 111 is supported and positioned, which is conducive to the connection of the terminal assembly 2 and the first housing wall 111 from the outer side of the first housing wall 111 (namely, the side facing away from the cell bodies 32) by welding.

[0321] Referring to FIG. 33 and FIG. 34 again, for example, a thickness of the lap portion 1112 matches a recess depth T2 of the second recess 22b. "Matching" is that the thickness of the lap portion 1112 is basically consistent with the recess depth of the second recess 22b. Therefore, the welding of the lap portion 1112 and the first housing wall 111 is facilitated, so that the thickness of the lap portion 1112 is not excessively large relative to the recess depth of the second recess 22b, thereby avoiding unnecessary space occupation, and the thickness of the lap portion 1112 is not excessively small relative to the recess depth of the second recess 22b, thereby meeting a welding strength requirement.

[0322] In some embodiments of the present application, referring to FIG. 7 again, the terminal assembly 2 defines an accommodating groove 5 recessed away from the cell assembly 3 relative to the first housing wall 111 and open toward the cell assembly 3, and at least a portion of the adapter 35 is accommodated in the accommodating groove 5 and the terminal body. In other words, the terminal assembly 2 defines the accommodating groove 5, a groove wall of the accommodating groove 5 is formed by the terminal assembly 2, the accommodating groove 5 is recessed away from the cell bodies 32, and the accommodating groove 5 opens toward the cell bodies 32, such that the accommodating groove 5 is in communication with the accommodating cavity 13.

[0323] Therefore, the accommodating groove 5 accommodates the adapter 35, to reduce the space occupation of the adapter 35 in the accommodating cavity 13, so that the accommodating cavity 13 has a larger space for accommodating the cell bodies 32, which is conducive to increasing the sizes of the cell bodies 32, thereby improving the energy density of the battery cell 102. In addition, because the accommodating groove 5 is open toward the cell assembly 3, the adapter 35 easily extends into the accommodating groove 5, thereby reducing operation difficulty.

[0324] For example, referring to FIG. 7 again, the accommodating groove 5 is formed on a side (namely, the side facing the cell bodies 32) of the terminal body 21 and the adapter structure 22 facing the cell assembly 3, and the adapter structure 22 bulges away from the cell assembly 3 (namely, away from the cell bodies 32) relative to the first housing wall 111, such that the accommodating groove 5 is recessed away from the cell assembly 3 relative to the first housing wall 111.

[0325] Therefore, the adapter structure 22 is processed into a bulged form protruding outward, so that a portion of the accommodating groove 5 is formed on a side of the terminal body 21 facing the cell assembly 3, another portion of the accommodating groove 5 is formed on a side of the adapter structure 22 facing the cell assembly 3, and the accommodating groove 5 assumes a shape of being recessed away from the cell assembly 3 relative to the first housing wall 111. In this way, the side of the terminal body 21 facing the cell assembly 3 and the side of the adapter structure 22 facing the cell assembly 3 are both provided with spaces for accommodating the conductive portion 4, which accommodates the conductive portion 4 to a greater extent, and is also conducive to the diverse design of the form of the conductive portion 4.

[0326] In other embodiments of the present application, with reference to FIG. 27, when the adapter structure 22 does not bulge away from the cell assembly 3 (namely, away from the cell bodies 32) relative to the first housing wall 111, a height difference between the adapter structure 22 and the terminal body 21 defines the accommodating groove 5 recessed away from the cell assembly 3 relative to the first housing wall 111.

[0327] In some embodiments of the present application, referring to FIG. 7 again, a surface of an end of the terminal body 21 facing the cell assembly 3 is the inner end surface 211 of the terminal body 21, the inner end surface 211 of the terminal body 21 participates in defining the accommodating groove 5, and the conductive portion 4 is connected to the inner end surface 211 of the terminal body 21. In other words, at least a portion of the inner end surface 211 of the terminal body 21 participates in defining the groove wall of the accommodating groove 5, and the conductive portion 4 is connected to a portion of the inner end surface 211 of the terminal body 21 used as the groove wall of the accommodating groove 5. In the foregoing technical solution, at least a portion of the accommodating groove 5 is defined by a surface of the side of the terminal body 21 facing the cell assembly 3, and the conductive portion 4 accommodated in the accommodating groove 5 is easily in contact with and connected to the terminal body 21, thereby improving connection convenience and simplifying the structure.

[0328] For example, when at least a portion of the conductive portion 4 is accommodated in the accommodating groove 5, a terminal connecting portion (for example, a gathered portion 313 of the tab group 33, or a second connecting segment 412 or a first conductive segment 415 of a conductive member 41 herein) of the conductive portion 4 (for example, the tab group 33 or the conductive member 41) is laid on the inner end surface 211 of the terminal body 21, and is connected to the inner end surface 211 of the terminal body 21. During processing, the terminal connecting portion of the conductive portion 4 is first mounted into the accommodating groove 5, and then the terminal connecting portion is laid on the inner end surface 211 of the terminal body 21, and is connected to the inner end surface 211 of the terminal body 21.

[0329] For example, the conductive portion 4 includes the terminal connecting portion. The terminal connecting portion is a relatively rigid plate, for example, does not bend and deform downward under the action of gravity, and is, for example, a gathered portion 313 (for example, an ultrasonic weld mark) of the tab group 33, or the second connecting segment 412 (for example, a metal sheet) or the first conductive segment 415 (for example, a metal sheet) of the conductive member 41 herein.

[0330] For example, referring to FIG. 7, regardless of whether the adapter structure 22 bulges away from the cell assembly 3 relative to the first housing wall 111, a position of the inner end surface 220 of the adapter structure 22 adjacent to the terminal body 21 surrounds a surrounding region 2201 of the terminal body 21, and the surrounding region 2201 is flush with the inner end surface 211 of the terminal body 21. The inner end surface 220 of the adapter structure 22 is a planar structure or is a nonplanar structure, for example, a bulged configuration. A ring of the inner end surface 220 of the adapter structure 22 closest to the terminal body 21 is the surrounding region 2201.

[0331] For example, when the inner end surface 211 of the terminal body 21 is disposed to be large (for example, the adapter structure 22 is formed as the elongated shape extending in the length direction of the first housing wall 111, and the contour shape of the terminal body 21 matches the contour shape of the adapter structure 22) and when the surrounding region 2201 is flush with the inner end surface 211 of the terminal body 21, the terminal connecting portion (for example, the gathered portion 313 of the tab group 33 or the second connecting segment 412 of the conductive member 41 herein) of the conductive portion 4 is completely laid flat on the inner end surface 211 of the terminal body 21.

[0332] For example, with reference to FIG. 25, when the inner end surface 211 of the terminal body 21 is small (for example, the adapter structure 22 is disposed to have the elongated shape extending in the length direction of the first housing wall 111, and the terminal body 21 is disposed at the center of the adapter structure 22 and has a circular contour) and when the surrounding region 2201 is flush with the inner end surface 211 of the terminal body 21, a portion of the terminal connecting portion (for example, the gathered portion 313 of the tab group 33 or the second connecting segment 412 of the conductive member 41 herein) of the conductive portion 4 is laid flat on the inner end surface 211 of the terminal body 21. The remaining portion is laid flat on the surrounding region 2201, so that the terminal connecting portion (for example, the terminal connecting portion also has an elongated shape) of the conductive portion 4 is entirely supported, thereby facilitating the pressing of a welding nozzle, so that the conductive portion 4 is reliably connected to the terminal body 21.

[0333] For example, the conductive portion 4 includes the terminal connecting portion. The terminal connecting portion is a relatively rigid plate, for example, does not bend and deform downward under the action of gravity, and is, for example, a gathered portion 313 (for example, an ultrasonic weld mark) of the tab group 33, or the second connecting segment 412 (for example, a metal sheet) or the first conductive segment 415 (for example, a metal sheet) of the conductive member 41 herein.

[0334] For example, referring to FIG. 26, regardless of whether the adapter structure 22 bulges away from the cell assembly 3 relative to the first housing wall 111, a position of the inner end surface 220 of the adapter structure 22 adjacent to the terminal body 21 surrounds a surrounding region 2201 of the terminal body 21, and the inner end surface 211 of the terminal body 21 protrudes from the surrounding region 2201 toward the cell assembly 3. The inner end surface 220 of the adapter structure 22 is a planar structure or is a nonplanar structure, for example, a bulged configuration. A ring of the inner end surface 220 of the adapter structure 22 closest to the terminal body 21 is the surrounding region 2201.

[0335] Therefore, the inner end surface 211 of the terminal body 21 protrudes from the surrounding region 2201 toward the cell assembly 3, so that when the terminal body 21 has a fixed height, it is equivalent to that the terminal body 21 is received into the accommodating cavity 13, to reduce a space outside the housing assembly 1 occupied by the terminal assembly 2, thereby reducing the dimension of the battery cell 102 in a direction (the first direction F1 shown in FIG. 3) in which the terminal assembly 2 is disposed.

[0336] For example, when the inner end surface 211 of the terminal body 21 is disposed to be large (for example, the adapter structure 22 is formed as the elongated shape extending in the length direction of the first housing wall 111, and the contour shape of the terminal body 21 matches the contour shape of the adapter structure 22) and when the inner end surface 211 of the terminal body 21 protrudes from the surrounding region 2201 toward the cell assembly 3, the terminal connecting portion (for example, the gathered portion 313 of the tab group 33 or the second connecting segment 412 of the conductive member 41 herein) of the conductive portion 4 is completely laid flat on the inner end surface 211 of the terminal body 21.

[0337] For example, with reference to FIG. 26, when the inner end surface 211 of the terminal body 21 is small (for example, the adapter structure 22 is disposed to have an elongated shape extending in the length direction of the first housing wall 111, and the terminal body 21 is disposed at the center of the adapter structure 22 and has a circular contour) and when the inner end surface 211 of the terminal body 21 protrudes from the surrounding region 2201 toward the cell assembly 3, the conductive portion 4 is disposed to include the tab group 33 and the conductive member 41 connected to the tab group 33, the conductive member 41 includes the first conductive segment 415 laid on the inner end surface 211 of the terminal body 21 and a second conductive segment 416 staggered from the inner end surface 211 of the terminal body 21, the second conductive segment 416 protrudes away from the cell assembly 3 (namely, toward the outer side, or in other words, away from the cell bodies 32) relative to the first conductive segment 415, and the tab group 33 is connected to the second conductive segment 416. Therefore, a height difference of the inner end surface 211 of the terminal body 21 relative to the surrounding region 2201 is used to accommodate the second conductive segment 416 of the conductive member 41 and the tab group 33, so that a space is fully utilized, thereby reducing the space occupation of the conductive portion 4 in the accommodating cavity 13, and improving the energy density of the battery cell 102. For example, if a portion (for example, the gathered portion 313 herein) of the tab group 33 connected to the second conductive segment 416 has an elongated shape, the second conductive segment 416 is also disposed to have an elongated shape, and the first conductive segment 415 is also disposed to have a circular shape matching the shape of terminal body 21, thereby meeting connection requirements. In addition, when the conductive member 41 includes the first conductive segment 415 and the second conductive segment 416, to ensure that the second conductive segment 416 protrudes away from the cell assembly 3 relative to the first conductive segment 415, a material with a fixed hardness and thickness is chosen to process the conductive member 41. For example, the conductive member 41 is a metal sheet.

[0338] For example, referring to FIG. 27, regardless of whether the adapter structure 22 bulges relative to the first housing wall 111 away from the cell assembly 3, a position of the inner end surface 220 of the adapter structure 22 adjacent to the terminal body 21 surrounds a surrounding region 2201 of the terminal body 21, and the surrounding region 2201 protrudes from the inner end surface 211 of the terminal body 21 toward the cell assembly 3. The inner end surface 220 of the adapter structure 22 is a planar structure or is a nonplanar structure, for example, a bulged configuration. A ring of the inner end surface 220 of the adapter structure 22 closest to the terminal body 21 is the surrounding region 2201.

[0339] For example, referring to FIG. 29, when the inner end surface 211 of the terminal body 21 is disposed to be large (for example, the adapter structure 22 is formed as the elongated shape extending in the length direction of the first housing wall 111, and the contour shape of the terminal body 21 matches the contour shape of the adapter structure 22) and when the surrounding region 2201 protrudes from the inner end surface 211 of the terminal body 21 toward the cell assembly 3, the terminal connecting portion (for example, the gathered portion 313 of the tab group 33 or the second connecting segment 412 of the conductive member 41 herein) of the conductive portion 4 is completely laid flat on the inner end surface 211 of the terminal body 21.

[0340] For example, with reference to FIG. 27, when the inner end surface 211 of the terminal body 21 is small (for example, the adapter structure 22 is disposed to have an elongated shape extending in the length direction of the first housing wall 111, and the terminal body 21 is disposed at the center of the adapter structure 22 and has a circular contour) and when the surrounding region 2201 protrudes from the inner end surface 211 of the terminal body 21 toward the cell assembly 3, the conductive member 41 is disposed to include the first conductive segment 415 laid on the inner end surface 211 of the terminal body 21 and a third conductive segment 417 staggered from the inner end surface 211 of the terminal body 21, the third conductive segment 417 protrudes toward the cell assembly 3 relative to the first conductive segment 415, and the tab group 33 is connected to the third conductive segment 417. Therefore, the adapter 41 meets a connection requirement with the inner end surface 211 of the terminal body 21, and easily meets a connection requirement with the tab group 33. In addition, when the conductive member 41 includes the first conductive segment 415 and the third conductive segment 417, to ensure that the third conductive segment 417 protrudes toward the cell assembly 3 relative to the first conductive segment 415, a material with a fixed hardness and thickness is chosen to process the conductive member 41. For example, the conductive member 41 is a metal sheet. For example, if a portion (for example, the gathered portion 313 herein) of the tab group 33 connected to the third conductive segment 417 has an elongated shape, the third conductive segment 417 is also disposed to have an elongated shape, and the first conductive segment 415 is also disposed to have a shape (for example, a circular shape) matching a shape of a fitted region 211a, thereby meeting connection requirements.

[0341] Referring to FIG. 4 and FIG. 5, in some embodiments, the housing assembly 1 includes a housing body 11 and a housing cover 12, the housing body 11 is integrally formed, the housing body 11 is open at one end, and the housing cover 12 is disposed at the open end of the housing body 11. For example, the opening 113 is provided at the open end of the housing body 11, the housing cover 12 covers the opening 113, and the housing body 11 and the housing cover 12 jointly define the accommodating cavity 13. With reference to FIG. 4, the first housing wall 111 is located at an end of the housing body 11 away from the housing cover 12. To be specific, a housing wall of an end of the housing body 11 opposite to the opening 113 is the first housing wall 111. Alternatively, with reference to FIG. 5, the first housing wall 111 is formed on the housing cover 12, so that the housing cover 12 is used as the first housing wall 111.

[0342] Certainly, in another example, the housing assembly 1 further includes two housing bodies 11. An end of each of the housing bodies 11 is open to form the opening 113. The two housing bodies 11 have openings 113 opposite to each other and cover each other. The two housing bodies 11 jointly define the accommodating cavity 13. A housing wall of an end of one of the housing bodies 11 opposite to the opening 113 is the first housing wall 111.

[0343] In some embodiments, with reference to FIG. 4, the housing assembly 1 includes the housing body 11 that participates in defining the accommodating cavity 13. One end of the housing body 11 is open to form the opening 113. A housing wall of an end of the housing body 11 opposite to the opening 113 is the first housing wall 111. It is to be understood that, the housing body 11 is an integrally formed member and includes the first housing wall 111 and the second housing wall 114. The second housing wall 114 surrounds an edge of the first housing wall 111, and the second housing wall 114 extends from the edge of the first housing wall 111 toward a side of the first housing wall 111 in the thickness direction. The opening 113 is defined at an end of the second housing wall 114 away from the first housing wall 111. A hollow cavity is defined between the first housing wall 111 and the second housing wall 114, and the hollow cavity forms at least a portion of the accommodating cavity 13.

[0344] When the housing assembly 1 includes the housing body 11 provided with the opening 113 at one end, the housing assembly 1 further includes a housing body fitting structure, and the housing body fitting structure is fitted with the housing body 11, to close the opening 113 and jointly define the accommodating cavity 13 with the housing body 11. For example, the housing body 11 has a semi-closed cylindrical shape, and the housing body fitting structure has a flat plate shape. To be specific, the housing body fitting structure is the housing cover 12. In this case, the housing assembly 1 has a combined form of the housing body 11 and the housing cover 12. For another example, the housing body 11 has a semi-closed cylindrical shape, and the housing body fitting structure has a semi-closed cylindrical shape. To be specific, the housing body fitting structure is the other half of the housing body 11. In this case, the housing assembly 1 has a combined form of two housing bodies 11. For still another example, the housing body fitting structure is a shell assembly. The shell assembly is formed by assembling a plurality of parts. Therefore, the housing assembly has diverse configurations, and is adaptable to various application scenarios.

[0345] For example, with reference to FIG. 4, the housing assembly 1 includes the housing body 11 and the housing cover 12, the opening 113 is provided at an end of the housing body 11, the housing cover 12 covers the opening 113, the housing body 11 and the housing cover 12 jointly define the accommodating cavity 13, and a housing wall of an end of the housing body 11 opposite to the opening 113 is used as the first housing wall 111. Alternatively, for example, the housing assembly 1 includes two housing bodies 11. The opening 113 is provided at an end of each the housing bodies 11. The two housing bodies 11 have openings 113 opposite to each other and cover each other. The two housing bodies 11 jointly define the accommodating cavity 13. A housing wall of an end of one of the housing bodies 11 opposite to the opening 113 is used as the first housing wall 111.

[0346] In the foregoing technical solution, when the housing wall of the end of the housing body 11 opposite to the opening is the first housing wall 111, because the cell assembly 3 accommodated in the housing assembly 1 is connected to the terminal assembly 2 mounted on the first housing wall 111, when the battery 100 vibrates or deforms, terminal assemblies 2 connected by the busbar component pull each other. Because the terminal assembly 2 is disposed on an end wall of the housing body 11 opposite to the opening 113, a force acting on the terminal assembly 2 is preferentially transmitted to the housing body 11 rather than being directly applied to the housing body fitting structure (for example, the housing cover 12). In this way, a distance for the force to be transmitted to a connection between the housing body 11 and the housing body fitting structure (for example, the housing cover 12) is increased, and the housing body 11 preferentially deforms under the action of the force, to reduce a force acting on the connection between the housing body 11 and the housing body fitting structure (for example, the housing cover 12), so that a probability of cracking at the connection between the housing body 11 and the housing body fitting structure (for example, the housing cover 12) in a use process of the battery 100 is effectively reduced, thereby improving the reliability of the battery cell 102. In addition, because a connection position between the housing body 11 and the housing body fitting structure (for example, the housing cover 12) is not prone to cracking, it is not necessary to increase wall thicknesses of the housing body 11 and the housing body fitting structure to improve the connection reliability between the housing body 11 and the housing body fitting structure, which is conducive to reducing the weight and material costs, and is conducive to achieving the miniaturization of the battery cell 102 or improving the energy density of the battery cell 102. A connection manner between the housing body 11 and the housing body fitting structure is not limited, and is, for example, bonding or welding.

[0347] For example, when the end wall of the housing body 11 opposite to the opening 113 is used as the first housing wall 111 used for mounting the terminal assembly 2, if the terminal assembly 2 is first mounted at the mounting hole 112 of the first housing wall 111 and the cell assembly 3 is then mounted into the housing body 11, it is difficult to connect the cell assembly 3 to the terminal assembly 2. In some embodiments of the present application, the cell assembly 3 is first connected to the terminal assembly 2, and then the terminal assembly 2 is assembled and connected to the housing assembly 1, so that a connection requirement of the cell assembly 3 and the terminal assembly 2 is met, and a connection requirement of the terminal assembly 2 and the housing assembly 1 is met, thereby improving the reliability and processability of the battery cell 102.

[0348] In addition, this processing sequence effectively reduces the length of the conductive portion 4, for example, provided that the cell assembly 3 is first connected to the terminal assembly 2 and the terminal assembly 2 is then connected to the housing assembly 1, so that the materials are saved and the costs are reduced for the conductive portion 4, the redundancy of the conductive portion 4 is reduced, a risk of short circuit is reduced, and the space occupation of the conductive portion 4 in the housing assembly 1 is reduced, which is conducive to improving the energy density of the battery cell 102.

[0349] Referring to FIG. 3, in some embodiments of the present application, the battery cell 102 further includes a pressure relief assembly 6, and the pressure relief assembly 6 is disposed on the housing assembly 1. For example, the pressure relief assembly 6 is a pressure relief valve mounted on the housing assembly 1, or is a thinned region integrally formed on the housing assembly 1. Therefore, the pressure relief assembly 6 is disposed, so that when a pressure in the housing assembly 1 exceeds a preset value, directional pressure relief is performed through the pressure relief assembly 6, thereby improving the reliability of the battery cell 102. The pressure relief assembly 6 is disposed on the first housing wall 111 or disposed on a housing wall other than the first housing wall 111, and one or more first housing walls 111 are provided.

[0350] For example, with reference to FIG. 3, the pressure relief assembly 6 and the terminal assembly 2 are located on the same side. Because the terminal assembly 2 is disposed on the first housing wall 111, when the pressure relief assembly 6 is also disposed on the first housing wall 111, the pressure relief assembly 6 and the terminal assembly 2 are located on the same side. Therefore, the design of housing walls other than the first housing wall 111 is simplified, thereby simplifying the structure and processing of the battery cell 102.

[0351] For example, the pressure relief assembly 6 and the terminal assembly 2 are located on different sides. Because the terminal assembly 2 is disposed on the first housing wall 111, when the pressure relief assembly 6 is disposed on a wall other than the first housing wall 111 of the housing assembly 1, for example, the pressure relief apparatus 6 is disposed on the second housing wall 114, or the pressure relief apparatus 6 is disposed on the housing cover 12, the pressure relief apparatus 6 and the terminal assembly 2 are located on different sides. Therefore, the size of the terminal assembly 2 is reduced without considering the space occupation of the pressure relief assembly 6 on the first housing wall 111, so that the shape and size of the terminal assembly 2 are flexibly designed as required.

[0352] For example, the housing assembly 1 is defined by a plurality of housing walls that are not coplanar. For example, a cuboid-shaped housing wall assembly is defined by six housing walls. One of the housing walls is the first housing wall 111. The pressure relief assembly 6 is disposed on any housing wall other than the first housing wall 111, and the terminal assembly 2 is disposed on the first housing wall 111. The pressure relief assembly 6 and the terminal assembly 2 are located on different sides.

[0353] According to a second aspect, an embodiment of the present application provides a processing method. The processing method is used for processing the foregoing battery cell 102. Referring to FIG. 35, the processing method includes the following steps:

[0354] Step S20: Mount the cell assembly 3 into the accommodating cavity 13, such that an end of the cell assembly 3 provided with the tab group 33 is on an inner side of the first housing wall 111 and disposed opposite to the first housing wall 111.

[0355] Step S30: Mount the terminal assembly 2 on the first housing wall 111, and connect the tab group 33 to the terminal body 21 by the adapter 35, such that the adapter 35 supports the free end 331 of the tab group 33, so that the adapter 35 prevents the free end 331 from moving toward the cell bodies 32.

[0356] "The inner side of the first housing wall 111" is a side of the first housing wall 111 facing the cell bodies 32 in the thickness direction, and "the outer side of the first housing wall 111" is a side of the first housing wall 111 facing away from the cell bodies 32 in the thickness direction.

[0357] A sequence of "mounting the terminal assembly 2 on the first housing wall 111" and "connecting the tab group 33 to the terminal body 21 by the adapter 35" is not limited in the present application. The terminal assembly 2 is first mounted on the first housing wall 111 and then the tab group 33 is connected to the terminal body 21 by the adapter 35, or the tab group 33 is first connected to the terminal body 21 by the adapter 35 and then the terminal assembly 2 is mounted on the first housing wall 111. In either sequence, the adapter 35 supports the free end 331 of the tab group 33.

[0358] Therefore, the tab group 33 is indirectly connected to the terminal body 21 by the adapter 35 to form electrical conduction, so that the length of the tab group 33 is reduced and the redundancy of the tab group 33 is reduced, thereby mitigating problems such as wrinkling and bending and fracture of the tab piece 311 of the tab group 33. In addition, the length of the tab group 33 is small, and the adapter 35 is connected to the tab group 33 to partially restrict the tab group 33, which is conducive to reducing a risk of short circuit caused by the tab group 33 being reversely inserted into the cell bodies 32. In addition, the shape, material, or the like of the adapter 35 is flexibly designed, thereby simplifying the connection between the adapter 35 and the terminal body 21 and simplifying the connection between the adapter 35 and the tab group 33, which is conducive to improving the assembly convenience of the battery cell 102.

[0359] In addition, the adapter 35 supports a free end 331 of the tab group 33. For example, a portion of the adapter 35 supports a side of the free end 331 of the tab group 33 facing the cell bodies 32, or, a portion of the adapter 35 supports a side of the free end 331 of the tab group 33 facing away from the terminal body 21, so that the free end 331 of the tab group 33 is located between an inner end surface 211 of the terminal body 21 and the portion of the adapter 35 that supports the free end 331 of the tab group 33. The foregoing supporting arrangement of the adapter 35 prevents the free end 331 of the tab group 33 from moving toward the cell bodies 32. For example, when the tab group 33 is subjected to an external force and the tab group 33 has a tendency to move toward the cell bodies 32, the adapter 35 applies a reaction force to the free end 331 of the tab group 33 to hinder the tendency of the tab group 33 to move toward the cell bodies 32, thereby reducing a risk of short circuit caused by the tab group 33 moving toward the cell bodies 32 and being reversely inserted into the cell bodies 32, which is conducive to improving the reliability of the battery cell 102.

[0360] It is to be understood that, in the step of "mounting the terminal assembly 2 on the first housing wall 111, and connecting the tab group 33 to the terminal body 21 by the adapter 35, such that the adapter 35 supports the free end 331 of the tab group 33", the tab group 33 is first connected to the terminal body 21 by the adapter 35, and the terminal assembly 2 is then mounted on the first housing wall 111. The cell assembly 3 is first connected to the terminal assembly 2, and the terminal assembly 3 connected to the cell assembly 3 is then mounted on the first housing wall 111. Because the terminal assembly 2 has various forms, the terminal assembly 2 is supplied as an integral, non-separable unit, or is supplied as a plurality of parts being assembled. In this case, "mounting the terminal assembly 2 connected to the cell assembly 3 on the first housing wall 111" is to be understood in a broad sense: assembling a portion of the terminal assembly 2 connected to the cell assembly 3 to the first housing wall 111.

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

[0362] For example, when the terminal assembly 2 needs to be assembled, "connecting the cell assembly 3 to the terminal assembly 2, and mounting the terminal assembly 2 connected to the cell assembly 3 on the first housing wall 111" is alternatively: "first connecting a portion (for example, the first terminal member) of the terminal assembly 2 to the cell assembly 3, connecting the remaining portion (for example, the second terminal member) of the terminal assembly 2 to the first housing wall 111, and then combining and connecting the foregoing two portions of the terminal assembly 2".

[0363] Instead of pre-mounting the terminal assembly and the housing assembly first and then connecting the cell assembly and the terminal assembly, the cell assembly 3 is first connected to the terminal assembly 2, and the terminal assembly 2 is then assembled and connected to the housing assembly 1, which is conducive to reducing the length of the conductive portion 4 connecting the terminal assembly 2 and the cell assembly 3, reducing the redundancy of the conductive portion 4 in the housing assembly 1, and reducing the space occupation of the conductive portion 4 in the housing assembly 1, is conducive to improving the energy density of the battery cell 102, and is conducive to reducing a risk of short circuit caused by the conductive portion 4 being reversely inserted into the cell bodies 32 of the cell assembly 3, thereby improving the reliability of the battery cell 102. In addition, this assembly method assembles the battery cell 102 regardless of whether the terminal assembly 2 is disposed on the housing body 11 or the terminal assembly 2 is disposed on the housing cover 12, so that the mounting position of the terminal assembly 2 is flexibly selected on the housing assembly 1. The terminal assembly 2 is disposed on the housing body 11, which is conducive to mitigating the problem of cracking at a connection between the housing body 11 and the housing cover 12, thereby improving the reliability of the battery cell 102.

[0364] In the embodiments of the present application, the execution sequence of the steps of the processing method is not determined by the step numbers, provided that there is no conflict. That is, the step numbers do not impose any limitation on the execution sequence of the steps.

[0365] Referring to FIG. 36 to FIG. 37E, in some embodiments, the mounting hole 112 is formed in the first housing wall 111, and step S20 of "mounting the terminal assembly 2 on the first housing wall 111, and connecting the tab group 33 to the terminal body 21 by the adapter 35, such that the adapter 35 supports the free end 331 of the tab group 33" includes the following steps: Step S31: Connect one end of the adapter 35 to the tab group 33, and pass the other end of the adapter 35 through the mounting hole 112 to extend to an outer side of the first housing wall 111 to be connected to the terminal body 21. Step S32: Cover the mounting hole 112 from the inner side or outer side of the first housing wall 111 with the terminal assembly 2 to which the adapter 35 is connected.

[0366] It is learned that, the foregoing solution is understood as that the adapter 35 first passes through the mounting hole 112, the adapter 35 is welded to the terminal assembly 2 outside the mounting hole 112, and the terminal assembly 2 then covers the mounting hole 112 from the outer side or inner side of the first housing wall 111. It is to be understood that, in the foregoing solution, when the terminal assembly 2 covers the mounting hole 11 from the inner side of the first housing wall 111, the terminal assembly 2 passes through the mounting hole 112 again to enable the terminal assembly 2 to be located on the inner side of the first housing wall 111, thereby connecting the terminal assembly 2 to the first housing wall 111.

[0367] For example, in step S31 of "connecting one end of the adapter 35 to the tab group 33, and passing the other end of the adapter 35 through the mounting hole 112 to extend to an outer side of the first housing wall 111 to be connected to the terminal body 21", one end of the adapter 35 is first connected to the tab group 33, the other end of the adapter 35 then extends from the mounting hole 112 to the outer side of the first housing wall 111, and subsequently the adapter 35 that extends to the outer side of the first housing wall 111 is connected to the terminal body 21 of the terminal assembly 2 placed on the outer side of the first housing wall 111. Therefore, because the adapter 35 is not connected to the terminal assembly 2 when passing through the mounting hole 112, it is easy to pass the adapter 35 through the mounting hole 112, thereby improving operational convenience. In addition, because a welding position between the terminal assembly 2 and the adapter 35 is located on the outer side of the first housing wall 111, the problem that conductive debris formed in a welding process enters the housing body 11 to cause damage to the cell assembly 3 is mitigated.

[0368] For example, the mounting hole 112 is an elongated (for example, rectangular, elliptical, racetrack-shaped) hole, a portion of the adapter 35 that needs to pass through the mounting hole 112 has an elongated shape matching the shape of the mounting hole 112. In this case, a thickness direction of the portion of the adapter 35 is adjusted to match the width direction of the mounting hole 112, and form an angle between a length direction of the portion of the conductive portion 4 and a length direction of the mounting hole 112. Therefore, the portion of the adapter 35 smoothly passes through the mounting hole 112, to improve assembly efficiency, thereby reducing a risk of collision or scratching between the adapter 35 and the housing assembly 1. However, the present application is not limited thereto. The mounting hole 112 and the portion of the adapter 35 that needs to pass through the mounting hole 112 are alternatively respectively processed into another shape, for example, a circular shape, or a polygonal shape.

[0369] In the foregoing solution, the adapter 35 first passes through the mounting hole 112, the adapter 35 is connected to the terminal assembly 2 outside the mounting hole 112, and the terminal assembly 2 to which the adapter 35 is connected then covers the mounting hole 112, which is applicable to a scenario in which the housing cover 12 is used as the first housing wall 111, also applicable to a scenario in which the housing body 11 includes the first housing wall 111, and further applicable to a scenario below in which the free end 331 is connected to the adapter 35 in the configuration of the laminated portion 312 or in the configuration of the first gathered portion 332.

[0370] Referring to FIG. 38 to FIG. 39D, in some embodiments, the mounting hole 112 is formed in the first housing wall 111, and step S30 of "mounting the terminal assembly 2 on the first housing wall 111, and connecting the tab group 33 to the terminal body 21 by the adapter 35, such that the adapter 35 supports the free end 331 of the tab group 33" includes the following steps: Step S33: Place the cell assembly 3 on the inner side of the first housing wall 111, connect one end of the adapter 35 to the tab group 33, and connect the other end of the adapter 35 to the terminal body 21. Step S34: Cover the mounting hole 112 from the inner side or outer side of the first housing wall 111 with the terminal assembly 2 to which the adapter 35 is connected after the terminal assembly 2 passes through the mounting hole 112.

[0371] It is learned that, the foregoing solution is understood as that the adapter 35 is first connected to the terminal assembly 2, to be specific, the cell assembly 3 is first connected to the terminal assembly 2, and after passing through the mounting hole 112, the terminal assembly 2 covers the mounting hole 11 from the outer side or inner side of the first housing wall 111, so that the cell assembly 3 is assembled to the terminal assembly 2 and the terminal assembly 2 is assembled to the first housing wall 111. It is to be understood that, in the foregoing solution, when the terminal assembly 2 to which the adapter 35 is connected covers the mounting hole 11 from the inner side of the first housing wall 111, the terminal assembly 2 to which the adapter 35 is connected does not need to pass through the mounting hole 112 and covers the mounting hole 112 from the inner side of the first housing wall 111. Alternatively, the terminal assembly 2 to which the adapter 35 is connected passes through the mounting hole 112 again to enable the terminal assembly 2 to be located on the inner side of the first housing wall 111, thereby connecting the first housing wall 111 to the terminal assembly 2 to which the adapter 35 is connected.

[0372] In the foregoing solution, the adapter 35 is first connected to the terminal assembly 2, and the terminal assembly 2 is then mounted on the first housing wall 111, which is applicable to a scenario in which the housing cover 12 is used as the first housing wall 111, also applicable to a scenario in which the housing body 11 includes the first housing wall 111, and further applicable to a scenario below in which the free end 331 is connected to the adapter 35 in the configuration of the laminated portion 312 or in the configuration of the first gathered portion 332.

[0373] For example, the terminal assembly 2 includes the terminal body 21 and the adapter structure 22, "mounting the terminal assembly 2 on the first housing wall 111" is understood as that the terminal assembly 2 connected to the cell assembly 3 is mounted on the first housing wall 111, which specifically includes: arranging the terminal assembly 2 connected to the cell assembly 3 at the mounting hole 112, and connecting the adapter structure 22 to the first housing wall 111.

[0374] "Arranging the terminal assembly 2 connected to the cell assembly 3 at the mounting hole 112, and connecting the adapter structure 22 to the first housing wall 111" specifically includes: passing the terminal assembly 2 connected to the cell assembly 3 from the inner side of the first housing wall 111 to extend from the mounting hole 112 to the outer side of the first housing wall 111; covering the mounting hole 112 from the outer side of the first housing wall 111 with the terminal assembly 2 extending to the outer side of the first housing wall 111, such that the adapter structure 22 abuts against the outer side of the first housing wall 111; and connecting the adapter structure 22 to the first housing wall 111 from the outer side of the first housing wall 111. That the adapter structure 22 abuts against the outer side of the first housing wall 111 is that a portion of the adapter structure 22 is supported on a side of a portion of the first housing wall 111 away from the cell bodies 32.

[0375] Therefore, because the cell assembly 3 is connected to the terminal assembly 2 before the terminal assembly 2 passes through the mounting hole 112, it is not necessary to consider the avoidance of the first housing wall 111 during the connection of the cell assembly 3 to the terminal assembly 2. In other words, during the connection of the cell assembly 3 to the terminal assembly 2, the terminal assembly 2 and the cell assembly 3 are not located on two sides of the first housing wall 111, which is conducive to further reducing the length of the conductive portion 4, reducing the redundancy of the conductive portion 4 after assembly, and reducing a risk of reverse insertion, thereby improving the reliability of the battery cell 102. In addition, because a welding position between the terminal assembly 2 and the cell assembly 3 is located outside the housing body 11, the problem that conductive debris formed in a welding process enters the housing body 11 to cause damage to the cell assembly 3 is mitigated. In addition, because the terminal assembly 2 covers the mounting hole 112 from the outer side of the first housing wall 111, the adapter structure 22 abuts against the outer side of the first housing wall 111, and the adapter structure 22 is connected to the first housing wall 111 from the outer side of the first housing wall 111, thereby facilitating the assembly and connection of the terminal assembly 2 and the first housing wall 111, which is conducive to improving the connection reliability between the terminal assembly 2 and the first housing wall 111.

[0376] Referring to FIG. 40 and FIG. 41, in some embodiments, the tab group 33 includes a plurality of tab pieces 311; and before step S31 of connecting the tab group 33 to the adapter 35, the method further includes the following step: Step S10a: Converge the plurality of tab pieces 311 to form the laminated portion 312 at the free end 331. The laminated portion 312 is that the plurality of tab pieces 311 are only converged but are not connected at the free end 331, to shape the tab group 33, thereby facilitating subsequent connection with the adapter 35.

[0377] For example, step S31 of connecting one end of the adapter 35 to the tab group 33 includes the following steps: Step S311: Connect the plurality of tab pieces 311 of the tab group 33 at a position of the laminated portion 312 to form the first gathered portion 332. Step S312: Connect at least a portion of the first gathered portion 332 to the adapter 35. It is learned that, the laminated portion 312 is first preconnected, such that the laminated portion 312 forms the somewhat stiff first gathered portion 332 instead of a delaminated and loose multi-layer foil configuration, thereby connecting the first gathered portion 332 to the adapter 35. In addition, the tab portion 33 and the adapter 35 are welded more reliably, and pores are not easily formed in weld seams, to improve the connection reliability and conductivity at the welding, so that electrical conduction between the cell assembly 3 and the terminal assembly 2 is more stable and reliable. The plurality of layers of tab pieces 311 in the first gathered portion 332 are in electrical conduction. To be specific, the plurality of layers of tab pieces 311 in the first gathered portion 332 have a stacked relationship and has a connected and conductive relationship.

[0378] For another example, step S31 of connecting one end of the adapter 35 to the tab group 33 includes the following step: Step S313: Connect at least a portion of the laminated portion 312 to the adapter 35. It is learned that, the laminated portion 312 alternatively does not need to be preconnected, and the laminated portion 312 is directly connected to the adapter 35, which is conducive to simplifying the processing procedure and improving processing efficiency, thereby enabling the laminated portion 312 to form the first gathered portion 332 while the laminated portion 312 is connected to the adapter 35, so that the laminated portion 312 is also reliably connected to the adapter 35.

[0379] It is to be understood that, in the foregoing solution, regardless of whether the first gathered portion 332 is connected to the adapter 35 or the laminated portion 312 is connected to the adapter 35, through the connection position thereof, after the terminal assembly 2 is mounted on the first housing wall 111, at least a portion of the first gathered portion 332 is connected to a side of a portion of the adapter 35 facing away from the cell bodies 32, so that the adapter 35 prevents the free end 331 from moving toward the cell bodies 32.

[0380] In addition, in the foregoing solution, when one cell body 32 is provided, all the tab pieces 311 of the cell body 32 converge to form the laminated portion 312 at the free end 331. When a plurality of cell bodies 32 form a cell group 32A and one cell group 32A is provided, the tab pieces 311 of the cell group 32A converge to form the laminated portion 312 at the free end 331. When a plurality of cell groups 32A are provided, the tab pieces 311 of each cell group 32A converge to form the laminated portion 312 at the free end 331. In this case, a plurality of laminated portions 312 are provided, and each of the laminated portions 312 is connected to the adapter 35, or each of the laminated portions 312 forms the first gathered portion 332 and is then connected to the adapter 35.

[0381] In the foregoing solution, if a plurality of cell bodies 32 are provided, before the tab group 3 is connected to the adapter 35, the plurality of cell bodies 32 are first stacked. A plurality of tab pieces 311 with the same polarity of the plurality of cell bodies 32 in the same cell group 32A are converged to form the laminated portion 312. Compared with the technical solution in which the tab pieces 311 of each cell body 32 are separately converged to form the laminated portion 312, the laminated portion 312 of each cell subassembly 31 is separately connected to the conductive member 41, and then the plurality of cell bodies 32 are stacked, in one aspect, a total quantity of the laminated portions 312 and the adapters 35 is reduced, so that connection steps of the laminated portions 312 and the adapters 35 are reduced, thereby improving processing efficiency, and in another aspect, the problem of cracking at connection positions between the tab group 33 and the cell bodies 32 caused by tensile stress formed between the tab pieces 311 of different cell bodies 32 due to asynchronous movement when the laminated portions 312 are first connected to the conductive member 41 and the cell bodies 32 are then stacked is avoided.

[0382] It is to be understood that, regardless of whether the free end 331 is connected to the adapter 35 in the configuration of the laminated portion 312 or connected to the adapter 35 in the configuration of the first gathered portion 332, the free end 331 and the adapter 35 are stacked in the thickness direction of the free end 331, thereby facilitating the fitting and connection of the free end 331 and the adapter 35.

[0383] Regardless of whether one or more cell bodies 32 are provided and a configuration in which the free end 331 is connected to the adapter 35, the foregoing solution is applicable to a scenario in which the housing cover 12 is used as the first housing wall 111 and also applicable to a scenario in which the housing body 11 includes the first housing wall 111.

[0384] Referring to FIG. 37A, FIG. 37B, and FIG. 42, in some embodiments, the clamping structure 356 is provided at the end of the adapter 35 away from the terminal body 21, and the clamping structure 356 includes the two clamping portions 3561 disposed opposite to each other. In this case, step S31 of connecting one end of the adapter 35 to the tab group 33 includes the following steps: Step S314: Clamp the free end 331 from two sides of the free end 331 with the two clamping portions 3561. Step S315: Connect the two clamping portions 3561 to the free end 331.

[0385] It is to be understood that, the free end 331 is fitted with the clamping structure 356 in the configuration of the laminated portion 312, or is fitted with the clamping structure 356 in the configuration of the first gathered portion 332. Therefore, the two clamping portions 3561 protect the free end 331, to mitigate the problem that the free end 331 is prone to cracking in a process of connecting the free end 331 to the clamping structure 356, thereby improving the connection reliability between the adapter 35 and the tab group 33.

[0386] For example, before the clamping structure 356 is fitted with the free end 331, the two clamping portions 3561 are first opened. For example, one of the clamping portions 3561 is tilted away from the other clamping portion 3561 to increase an angle between the two clamping portions 3561, thereby rapidly fitting the free end 331 between the two clamping portions 3561. Subsequently, the free end 331 is fitted between the two clamping portions 3561, and the angle between the two clamping portions 3561 is reduced, so that the two clamping portions 3561 are clamped on the two sides of the free end 331 in the thickness direction, and the clamping structure 356 is then connected to the free end 331.

[0387] Referring to FIG. 43, in some embodiments, the adapter 35 includes the plurality of adapter foils 350. In this case, before step S31 of connecting one end of the adapter 35 to the tab group 33, the method further includes the following steps: Step S10b: Stack the plurality of adapter foils 350. Step S10c: Connect the partial regions of the stack to form the first connecting portion 351 to facilitate connection between the plurality of adapter foils 350, so that the compactness of the adapter foils 350 at the first connecting portion 351 is improved, thereby connecting the adapter 35 to the terminal assembly 2. Step S31 of connecting one end of the adapter 35 to the tab group 33, and connecting the other end of the adapter 35 to the terminal body 21 includes the following steps: Step S316: Connect the partial regions of the stack of the plurality of adapter foils 350 to the free end 331, such that the partial regions of the stack form the second connecting portion 352 spaced apart from the first connecting portion 351. Step S317: Connect the first connecting portion 351 to the terminal body 21.

[0388] It is learned that, in the foregoing solution, "connecting the plurality of adapter foils 350 to the free end 331" and "connecting the partial regions of the stack of the plurality of adapter foils 350 to form the second connecting portion 351" are performed simultaneously, which is conducive to simplifying the processing procedure. A sequence of "forming the second connecting portion 352" (connecting the partial regions of the stack of the plurality of adapter foils 350 to the free end 331, such that the partial regions of the stack form the second connecting portion 352 spaced apart from the first connecting portion 351) and "connecting the first connecting portion 351 to the terminal body 21" is not specifically limited.

[0389] Certainly, in other embodiments of the present application, when the adapter 35 includes the plurality of adapter foils 350, the step of connecting one end of the adapter 35 to the tab group 33, and connecting the other end of the adapter 35 to the terminal body 21 is configured to include: connecting the partial regions of the stack of the plurality of adapter foils 350 to form the second connecting portion 352, and then connecting the second connecting portion 352 to the free end 331. To be specific, "connecting the plurality of adapter foils 350 to the free end 331" and "connecting the partial regions of the stack of the plurality of adapter foils 350 to form the second connecting portion 351" are performed separately and sequentially.

[0390] It is to be understood that, in the foregoing solution, regardless of whether the partial regions of the stack of the plurality of adapter foils 350 are connected to the free end 331, such that the partial regions of the stack form the second connecting portion 352 spaced apart from the first connecting portion 351, or the second connecting portion 352 is first formed and the second connecting portion 352 is then connected to the free end 331, the free end 331 is connected in the form of the laminated portion 312, or the free end 331 is connected in the form of the first gathered portion 332.

[0391] Referring to FIG. 37E, FIG. 39D, and FIG. 44, in some embodiments, step S32 of covering the mounting hole 112 from the inner side or outer side of the first housing wall 111 with the terminal assembly 2 to which the adapter 35 is connected includes the following step: Step S30a: Bend a portion of the tab group 33 and the adapter 35 being connected located between the first housing wall 111 and the cell bodies 32 into a bent shape when the terminal assembly 2 is mounted on the first housing wall 111. In still some embodiments, step S34 of covering the mounting hole 112 from the inner side or outer side of the first housing wall 111 with the terminal assembly 2 to which the adapter 35 is connected after the terminal assembly 2 passes through the mounting hole 112 includes the following step: Step S30a: Bend a portion of the tab group 33 and the adapter 35 being connected located between the first housing wall 111 and the cell bodies 32 into a bent shape when the terminal assembly 2 is mounted on the first housing wall 111.

[0392] Therefore, for any case above, the conductive portion 4 formed by the tab group 33 and the adapter 35 provides cushioning, so that during the use of the battery cell 102 in a vibration environment, the impact of the cell bodies 32 toward the first housing wall 111 is reduced to protect the cell assembly 3, thereby improving the reliability of the battery cell 102. In addition, before the terminal assembly 2 is mounted on the first housing wall 111, the portion of the tab group 33 and the adapter 35 being connected located between the first housing wall 111 and the cell bodies 32 is basically in an unfolded state, to facilitate the connection between the tab group 33 and the adapter 35 and / or the connection between the adapter 35 and the terminal body 21, thereby providing a sufficient operation space, for example, thereby laying a portion of the adapter 35 connected to the terminal body 21 on the terminal body 21 for connection.

[0393] In the foregoing solution, when the terminal assembly 2 is mounted on the first housing wall 111, the portion of the tab group 33 and the adapter 35 being connected located between the first housing wall 111 and the cell bodies 32 has a bent shape, which includes but is not limited to, shaping a portion of the tab group 33 and the adapter 35 located between the first housing wall 111 and the cell bodies 32 such that the foregoing portion has a bent shape. The manner and time of the shaping are not limited. For example, the shaping is performed along with the action of covering the first housing wall 111 with the terminal assembly 2 or performed along with the action of covering the second terminal member 21b with the first terminal member 21a, thereby improving processing efficiency. Certainly, when the terminal assembly 2 is mounted on the first housing wall 111, the portion of the tab group 33 and the adapter 35 located between the first housing wall 111 and the cell bodies 32 alternatively does not need to be shaped. The space is reduced due to the mounting of the terminal assembly 2, and a relative weak position is bent when the tab group 33 and the adapter 35 are subjected to an external force.

[0394] It is to be understood that, the portion of the tab group 33 and the adapter 35 being connected located between the first housing wall 111 and the cell bodies 32 has a bent shape. After the process is completed, a current state of the battery cell 102 is that the tab group 33 is bent to form at least one open slot (including the first open slot 334) and / or the adapter 35 is bent to form the second open slot 355. For example, after the foregoing 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 portion 4 generally assumes a serpentine configuration with reciprocating bends, thereby simplifying the foregoing steps. In addition, the length of the conductive portion 4 is reduced, and the structure of the conductive portion 4 is simplified, thereby facilitating the processing of the conductive portion 4.

[0395] With reference to FIG. 37A to FIG. 37E and FIG. 45, in some embodiments, the battery cell 102 includes the insulating bracket 42 located on the inner side of the first housing wall 111, the insulating bracket 42 is disposed on a side of the cell assembly 3 close to the terminal assembly 2, the insulating bracket 42 is provided with the through hole 40, and the tab group 33 passes through the through hole 91. In this case, Step S30a of bending a portion of the tab group 33 and the adapter 35 being connected located between the first housing wall 111 and the cell bodies 32 into a bent shape when the terminal assembly 2 is mounted on the first housing wall 111 includes the following steps: Step S301: Bend, when the terminal assembly 2 is mounted on the first housing wall 111, the portion of the tab group 33 and the adapter 35 being connected located between the first housing wall 111 and the cell bodies 32 to form the first open slot 334, where the free end 331 defines at least a portion of the slot wall of the first open slot 334 on the side close to the terminal body 21. Step S302: Insert a portion of the insulating bracket 42 into the first open slot 334, to enable the insulating bracket 42 to prevent the free end 331 from moving toward the cell bodies 32.

[0396] For example, "bending the portion of the tab group 33 and the adapter 35 being connected located between the first housing wall 111 and the cell bodies 32 to form the first open slot 334" and "inserting a portion of the insulating bracket 42 into the first open slot 334" are simultaneously performed.

[0397] Referring to FIG. 37D, FIG. 37E, and FIG. 46, in some embodiments, the battery cell 102 includes the insulating bracket 42 located on the inner side of the first housing wall 111. Step S30a of bending a portion of the tab group 33 and the adapter 35 being connected located between the first housing wall 111 and the cell bodies 32 into a bent shape when the terminal assembly 2 is mounted on the first housing wall 111 includes the following steps: Step S303: Bend, when the terminal assembly 2 is mounted on the first housing wall 111, the portion of the tab group 33 and the adapter 35 being connected located between the first housing wall 111 and the cell bodies 32 to form the first open slot 334 and the second open slot 355 that is adjacent to the first open slot 334 and located on the side of the first open slot 334 facing the terminal body 21, where the opening directions of the second open slot 355 and the first open slot 334 are arranged at an angle. Step S304: Insert portions of the insulating bracket 42 into the first open slot 334 and the second open slot 355, to enable the insulating bracket 42 to prevent the free end 331 from moving toward the cell bodies 32 and also to enable the insulating bracket 42 to prevent the adapter 35 from moving toward the cell bodies 32.

[0398] For example, in a state in which the cell bodies 32 connected to the conductive portion 4 are located on an inner side of the insulating bracket 42 and the terminal assembly 2 connected to the conductive portion 4 is located on the outer side of the first housing wall 111, "bending and deforming a portion of the conductive portion 4 located between the terminal assembly 2 and the cell bodies 32 into the first open slot 334 and the second open slot 355 with opposite opening directions" specifically includes: along with the action of covering the first housing wall 111 with the terminal assembly 2, enabling the conductive portion 4 to form two open slots 42 with opposite opening directions on the inner side and the outer side of the insulating bracket 42. To be specific, the conductive portion 4 forms one open slot (namely, the first open slot 421) on the inner side of the insulating bracket 42, and the conductive portion 4 forms another open slot (namely, the second open slot 422) on the outer side of the insulating bracket 42. Therefore, the insulating bracket 42 is disposed to enable the conductive portion 4 to be bent into the first open slot 334 and the second open slot 355 with opposite opening directions, thereby reducing processing difficulty.

[0399] Referring to FIG. 47, in some embodiments, step S31 and / or step S33 of connecting the other end of the adapter 35 to the terminal body 21 includes the following step: Step S30b: Adjust an angle of the terminal assembly 2, such that a normal direction of an inner end surface 211 of the terminal body 21 approaches a stacking direction of the plurality of cell bodies 32. Step S32 and / or step S34 of covering the mounting hole 112 with the terminal assembly 2 to which the adapter 35 is connected includes the following step: Step S30c: Adjust the angle of the terminal assembly 2 from the outer side of the first housing wall 111, such that the normal direction of the inner end surface 211 of the terminal body 21 approaches a direction perpendicular to the stacking direction (for example, the fourth direction F4) of the plurality of cell bodies 32, the tab group 33 is bent and deformed to form the first open slot 334, the adapter 35 is bent and deformed to form the second open slot 355, and the opening directions of the first open slot 334 and the second open slot 355 are arranged at an angle, such that the conductive portion 4 generally assumes a serpentine configuration.

[0400] In this embodiment, the step of stacking the plurality of cell bodies 32 is performed before the adapter 35 is connected to the terminal assembly 2 or after the adapter 35 is connected to the terminal assembly 2.

[0401] "A normal direction of an inner end surface 211 of the terminal body 21 approaches a stacking direction of the plurality of cell bodies 32" is that the normal direction of the inner end surface 211 of the terminal body 21 is consistent or generally consistent with the stacking direction of the plurality of cell bodies 32, and "generally consistent" is understood as that an angle between the normal direction of the inner end surface 211 of the terminal body 21 and the stacking direction of the plurality of cell bodies 32 is small, for example, less than 10°. "Arranging the terminal assembly 2 on a side of the cell assembly 3 extending out of the tab group 33" is understood as that the tab group 33 is located a side of the cell bodies 32, and the terminal assembly 2 and the tab group 33 are disposed on the same side of the cell bodies 32, which is conducive to reducing the length of the tab portion 33. In the foregoing technical solution, "the length of the tab portion 33" enables the terminal assembly 2 to assume that when the normal direction of the inner end surface 211 of the terminal body 21 approaches a stacking direction of the plurality of cell subassemblies 31, the terminal assembly 2 is located on a side of the cell assembly 3 extending out of the tab portion 33, and the adapter 35 is laid on the inner end surface 211 of the terminal body 21.

[0402] In the foregoing technical solution, the position and angle of the terminal assembly 2 are first adjusted, such that the normal direction of the inner end surface 211 of the terminal body 21 approaches a stacking direction of a plurality of cell subassemblies 31, and then a portion of the adapter 35 connected to the terminal body 21 is laid on the inner end surface 211 of the terminal body 21. Subsequently, an angle of the terminal body 21 no longer needs to be adjusted, so that there is a sufficient space near a fitting position between the portion of the adapter 35 connected to the terminal body 21 and the inner end surface 211 of the terminal body 21 for a welding operation on the adapter 35 and the terminal body 21, thereby simplifying operations. In addition, this further reduces the length of the tab portion 33. Subsequently, during the adjustment of the angle of the terminal assembly 2 for the connection to the first housing wall 111, thereby bending the conductive portion 4 to form the first open slot 334 and the second open slot 355.

[0403] Referring to FIG. 48 again, in some embodiments, the housing assembly 1 includes the housing body 11 and the housing cover 12, and the housing body 11 is provided with an opening 113. When an end wall of the housing body 11 opposite to the opening 113 is the first housing wall 111, step S20 of mounting the cell assembly 3 into the accommodating cavity 13, such that the cell assembly 3 is disposed on an inner side of the first housing wall 111 and disposed opposite to the first housing wall 111 includes the following steps: Step S21: Mount the cell assembly 3 into the accommodating cavity 13 from the opening 113. Step S22: Extend the tab group 33 from the mounting hole 113, such that the end of the cell assembly 3 provided with the tab group 33 is on the inner side of the first housing wall 111 and disposed opposite to the first housing wall 111. Step S23: Cover the opening 113 with a housing cover 12.

[0404] In the foregoing solution, "mounting the cell assembly 3 into the accommodating cavity 13, such that the cell assembly 3 is disposed on an inner side of the first housing wall 111 and disposed opposite to the first housing wall 111" includes: adjusting relative positions of the housing body 11, the cell assembly 3, and the conductive portion 4, such that the cell assembly 3 is located on a side of the adapter 35 connected to the cell assembly 3 away from the housing body 11, and the opening 113 of the housing body 11 faces the adapter 35, and subsequently the cell assembly 3 and the adapter 35 are mounted into the housing body 11 from the opening 113. A sequence of "mounting the cell assembly 3 into the accommodating cavity 13 from the opening 113" and "extending the tab group 33 from the mounting hole 113, such that the end of the cell assembly 3 provided with the tab group 33 is on the inner side of the first housing wall 111 and disposed opposite to the first housing wall 111" is not specifically limited. For example, the two steps are performed simultaneously.

[0405] Therefore, the terminal assembly 2 is disposed at an end of the housing body 11 opposite to the opening 113, which is conducive to mitigating the problem of cracking at a connection between the housing body 11 and the housing cover 12, thereby improving the reliability of the battery cell 102. "Adjusting relative positions of the housing body 11, the cell assembly 3, and the conductive portion 4" is implemented by adjusting the position of the housing body 11, or is implemented by adjusting the positions of the cell assembly and the conductive portion. "Mounting the cell assembly 3 and the adapter 35 into the housing body 11 from the opening 113" is implemented through the action of pushing the cell assembly or is implemented through the action of fitting the housing body.

[0406] For example, the action of passing the adapter 35 through the mounting hole 112 to extend to the outer side of the first housing wall 111 is implemented as the cell assembly 3 is mounted into the housing body 11. In other words, the action of passing the adapter 35 to extend through the mounting hole 112 is completed along with the action of loading the cell assembly 3, so that operations are convenient, thereby improving processing efficiency.

[0407] For example, during the assembly of the battery cell 102, the tab group 33 is first connected to the adapter 35 to form the conductive portion 4, and the cell assembly 3 is then mounted into the housing body 11 in a direction of the conductive portion 4 facing the mounting hole 112 relative to the cell bodies 32. Along with the movement of the cell assembly 3 being mounted into the housing body 11, the conductive portion 4 extends to an outer side of the mounting hole 112. The conductive portion 4 and the terminal assembly 2 placed on the outer side of the first housing wall 111 are connected on the outer side of the first housing wall 111. Next, the mounting hole 112 is covered from the outer side of the first housing wall 111 with the terminal assembly 2 to which the conductive portion 4 is connected. Subsequently, the terminal assembly 2 covering the mounting hole 112 is connected to the first housing wall 111.

[0408] Referring to FIG. 49 and FIG. 50A to FIG. 50F, in some embodiments, the housing assembly 1 includes the housing body 11 and the housing cover 12, and the housing body 11 is provided with an opening 113. When the housing cover 12 is the first housing wall 111, step S20 of mounting the cell assembly 3 into the accommodating cavity 13, such that the cell assembly 3 is disposed on an inner side of the first housing wall 111 and disposed opposite to the first housing wall 111 includes the following steps: Step S24: Support the cell assembly 3 on an inner side of the housing cover 12. Step S25: Extend the tab group 33 from the mounting hole 112, such that the end of the cell assembly 3 provided with the tab group 33 is on the inner side of the first housing wall 111 and disposed opposite to the first housing wall 111. Step S26: Sleeve the housing body 11 over an outer side of the cell assembly 3, and connect the housing body 11 to the housing cover 12.

[0409] For example, "connecting the adapter 35 extending to the outer side of the first housing wall 111 to the terminal body 21 of the terminal assembly 2 placed on the outer side of the first housing wall 111" is performed after "connecting the housing body 11 to the housing cover 12" (as shown in FIG. 18A to FIG. 18G). Alternatively, in other embodiments of the present application, "connecting the conductive portion 4 extending to the outer side of the first housing wall 111 to the terminal body 21 of the terminal assembly 2 placed on the outer side of the first housing wall 111" is performed before "sleeving the housing body 11 over the cell assembly 3".

[0410] Therefore, the housing body 11 is first connected to the housing cover 12, and then the terminal assembly 2 is connected to the housing cover 12, so that the housing body 11 is used to accommodate the cell assembly 3 and support the housing cover 12, thereby facilitating positioning and supporting of the housing cover 12 to facilitate the connection between the housing cover 12 and the adapter structure 22, thereby improving the connection reliability between the housing cover 12 and the terminal assembly 2. A connection manner between the housing body 11 and the housing cover 12 is not limited, and is, for example, welding or bonding.

[0411] For example, "passing the adapter 35 through the mounting hole 112 to extend to the outer side of the first housing wall to be connected to the terminal body 21" is performed after "connecting the housing body 11 to the housing cover 12". Alternatively, in other embodiments of the present application, "connecting the adapter 35 extending to the outer side of the first housing wall 111 to the terminal body 21 of the terminal assembly 2 placed on the outer side of the first housing wall 111" is performed before "sleeving the housing body 11 over the cell assembly 3".

[0412] Therefore, the housing body 11 is first connected to the housing cover 12, and then the terminal assembly 2 is connected to the housing cover 12, so that the housing body 11 is used to accommodate the cell assembly 3 and support the housing cover 12, thereby facilitating positioning and supporting of the housing cover 12 to facilitate the connection between the housing cover 12 and the adapter structure 22, thereby improving the connection reliability between the housing cover 12 and the terminal assembly 2.

[0413] Referring to FIG. 48, in some embodiments, when the end wall of the housing body 11 opposite to the opening 113 is the first housing wall 111, before step S20 of mounting the cell assembly 3 into the accommodating cavity 13 from the opening, the method further includes the following step: Step S27: Wrap the insulating film 41 around an outer side of the cell bodies 32. Therefore, the cell assembly 3 and the insulating film 41 are loaded into the housing together, thereby facilitating the arrangement of the insulating film 41, and achieving the insulating arrangement of the cell assembly 3 and the housing assembly 1.

[0414] Referring to FIG. 49, in some embodiments, when the housing cover 12 is the first housing wall 111, before step S26 of sleeving over the housing body 11 on the outer side of the cell assembly 3, the method further includes the following step: Step S28: Wrap the insulating film 41 around an outer side of the cell bodies 32. Therefore, the cell assembly 3 and the insulating film 41 are also loaded into the housing together in combination with the housing body 11, thereby facilitating the arrangement of the insulating film 41, and achieving the insulating arrangement of the cell assembly 3 and the housing assembly 1.

[0415] It is to be understood that, when the housing cover 12 is the first housing wall 111, a sequence of both "supporting the cell assembly 3 on an inner side of the housing cover 12" and "extending the tab group 33 from the mounting hole 112, such that the end of the cell assembly 3 provided with the tab group 33 is on the inner side of the first housing wall 111 and disposed opposite to the first housing wall 111" and "wrapping the insulating film 41 around an outer side of the cell bodies 32" is not specifically limited, provided that the insulating film 41 is wrapped before the housing body 11 is sleeved over the cell assembly 3.

[0416] For example, referring to FIG. 50A to FIG. 50F again, in some embodiments of the present application, when the housing cover 12 is the first housing wall 111, the insulating bracket 42 is provided on the inner side of the housing cover 12. Before sleeving the housing body 11 over the cell assembly 3, the method includes: placing the cell assembly 3 with the conductive portion 4 connected to the cell assembly 3 facing downward, and placing the housing cover 12 with the insulating bracket 42 facing upward; and wrapping the insulating film 41 outside the cell assembly 3 supported at the top of the insulating bracket 42, and connecting the insulating film 41 to the insulating bracket 42. In this case, the step of "sleeving the housing body 11 over the cell assembly 3" specifically includes: "placing the housing body 11 with the opening 113 facing downward, and sleeving the housing body 11 from top to bottom over the cell assembly 3 wrapped with the insulating film 41".

[0417] The step of "placing the cell assembly 3 with the conductive portion 4 connected to the cell assembly 3 facing downward, and placing the housing cover 12 with the insulating bracket 42 facing upward" is performed before "passing the other end of the adapter 35 through the mounting hole 112 to extend to an outer side of the first housing wall 111", or performed after "passing the other end of the adapter 35 through the mounting hole 112 to extend to an outer side of the first housing wall 111".

[0418] "Wrapping the insulating film 41 outside the cell assembly 3 supported at the top of the insulating bracket 42, and connecting the insulating film 41 to the insulating bracket 42" is performed in a state in which the insulating bracket 42 is supported at the bottom of the cell bodies 32 and the adapter 35 extends from the mounting hole 112 to the outer side of the first housing wall 111. In the state, the cell assembly 3 does not require another clamp for supporting and limiting, which is conducive to fast operations.

[0419] In the foregoing technical solution, when the housing cover 12 is the first housing wall 111, when the housing body 11 is sleeved over the cell assembly 3, because the housing cover 12 is not connected to the cell assembly 3, the insulating bracket 42 is disposed on the inner side of the housing cover 12 (namely, a side facing away from the cell bodies 32), and the cell assembly 3 is supported from the bottom of the cell assembly 3. In this way, another limiting clamp is not required, and the problem that the cell assembly 3 is separated from the housing cover 2 is avoided, so that it is only necessary to directly sleeving the housing body 11 from top to bottom during assembly, to simplify an assembly process, thereby reducing the use of a limiting clamp or the like.

[0420] Referring to FIG. 50A to FIG. 50F again, in some embodiments of the present application, when the housing cover 12 is the first housing wall 111, during the assembly of the battery cell 102, the following steps are sequentially performed: "placing the cell assembly 3 with the conductive portion 4 connected to the cell assembly 3 facing downward, and placing the housing cover 12 with the insulating bracket 42 facing upward", "placing the cell assembly 3 and the conductive portion 4 connected to the cell assembly 3 on the inner side of the first housing wall 111, and passing the conductive portion 4 through the mounting hole 112 to extend to the outer side of the first housing wall 111", "wrapping the insulating film 41 outside the cell assembly 3 supported at the top of the insulating bracket 42, and connecting the insulating film 41 to the insulating bracket 42", "placing the housing body 11 with the opening 113 facing downward, and sleeving the housing body 11 from top to bottom over the cell assembly 3 wrapped with the insulating film 41", "connecting the housing body 11 to the housing cover 12", "connecting the conductive portion 4 extending to the outer side of the first housing wall 111 to the terminal body 21 of the terminal assembly 2 placed on the outer side of the first housing wall 111", "covering the mounting hole 112 from the outer side of the first housing wall 111 with the terminal assembly 2 connected to the conductive portion 4, such that the adapter structure 22 abuts against the outer side of the first housing wall 111", and "connecting the adapter structure 22 to the first housing wall 111 from the outer side of the first housing wall 111".

[0421] For example, referring to FIG. 50A to FIG. 50F again, during the assembly of the battery cell 102, the plurality of electrode subassemblies 31 are stacked in a thickness direction (for example, the fourth direction F4) of the electrode subassemblies 31. The plurality of electrode subassemblies 31 are bound and stacked using a binding member 8 (for example, blue adhesive). A plurality of layers of tab pieces 311 with the same polarity of the plurality of electrode subassemblies 31 are stacked and converged to form the laminated portion 312, the laminated portion 312 is clamped between two clamping portions 4110 of the conductive member 41, and the laminated portion 312 and the clamping portion 4110 are connected by welding, so that the conductive portion 4 formed by combining the tab portion 33 and the conductive member 41 is obtained. The housing cover 12 is placed below the cell bodies 32, and the housing cover 12 is placed with the insulating bracket 42 facing upward. The cell bodies 32 are supported above the insulating bracket 42, and the insulating film 41 is then wrapped outside the cell bodies 32. A lower end of the insulating film 41 is thermally fused to the insulating bracket 42. The housing body 11 is then placed with the opening 113 facing downward, and the housing body 11 is sleeved from top to bottom over the cell bodies 32, and a lower end of the housing body 11 is welded to the housing cover 12. Subsequently, the housing body 11 is laid flat, the mounting hole 112 is open in a horizontal direction, and the conductive portion 4 is connected on an outer side of the housing cover 12 to the terminal assembly 2 placed on the outer side of the housing cover 12. Next, the mounting hole 112 is covered with the terminal assembly 2 connected to the conductive portion 4 from the outer side of the housing cover 12. Subsequently, the housing body 11 is tilted, such that the housing cover 12 is located above the housing body 11, and the terminal assembly 2 is located at the top of the housing cover 12, and the adapter structure 22 is welded and fixed to the housing cover 12.

[0422] In addition, in the embodiments of the present application, instead of premounting the terminal assembly and the housing assembly first and then connecting the cell assembly and the terminal assembly, the cell assembly 3 is first connected to the terminal assembly 2, and the terminal assembly 2 is then assembled and connected to the housing assembly 1, which is conducive to reducing the length of the conductive portion 4 connecting the terminal assembly 2 and the cell assembly 3, reducing the redundancy of the conductive portion 4 in the housing assembly 1, and reducing the space occupation of the conductive portion 4 in the housing assembly 1, is conducive to improving the energy density of the battery cell 102, and is conducive to reducing a risk of short circuit caused by the conductive portion 4 being reverse inserted into the cell bodies 32 of the cell assembly 3, thereby improving the reliability of the battery cell 102. In addition, this assembly method assembles the battery cell 102 regardless of whether the terminal assembly 2 is disposed on the housing body 11 or the terminal assembly 2 is disposed on the housing cover 12, so that the mounting position of the terminal assembly 2 is flexibly selected on the housing assembly 1. The terminal assembly 2 is disposed on the housing body 11, which is conducive to mitigating the problem of cracking at a connection between the housing body 11 and the housing cover 12, thereby improving the reliability of the battery cell 102.

[0423] When the end wall of the housing body 11 opposite to the opening 113 is used as the first housing wall 111, if the terminal assembly is first mounted on the first housing wall and the cell assembly is then mounted into the housing body, it is difficult to connect the cell assembly to the terminal assembly. In the embodiments of the present application, the cell assembly 3 is first connected to the terminal assembly 2, and then the terminal assembly 2 is connected to the housing assembly 1, so that a connection requirement of the cell assembly 3 and the terminal assembly 2 is met, and a connection requirement of the terminal assembly 2 and the housing assembly 1 is met. When the battery 100 vibrates or deforms, terminal assemblies 2 connected by the busbar component pull each other. Because the terminal assembly 2 is disposed on the first housing wall 111 of the housing body 11 opposite to the opening 113, a force acting on the terminal assembly 2 is preferentially transmitted to the housing body 11 rather than being directly applied to the housing cover 12. In this way, a distance for the force to be transmitted to a connection between the housing body 11 and the housing cover 12 (for example, a weld seam) is increased, and the housing body 11 preferentially deforms under the action of the force, to reduce a force acting on the connection between the housing body 11 and the housing cover 12, so that a probability of cracking at the connection between the housing body 11 and the housing cover 12 in a use process of the battery 100 is effectively reduced, thereby improving the reliability of the battery cell 102. In addition, because the connection between the housing body 11 and the housing cover 12 is not prone to cracking, it is not necessary to increase wall thicknesses of the housing body 11 and the housing cover 12 to improve the connection reliability between the housing body 11 and the housing cover 12, which is conducive to reducing the weight and material costs.

[0424] When the housing cover 12 is used as the first housing wall 111, if the terminal assembly is first mounted on the housing cover and the terminal assembly is then connected to the cell assembly, during the connection of the terminal assembly to the cell assembly, the length of the conductive portion needs to be set relatively large (for example, greater than a half of the width of the housing cover), so that the cell assembly is located on a side of the housing cover in a width direction. In this way, the length of the conductive portion is large, the redundancy of the conductive portion after assembly is high, and a risk of short circuit caused by reverse insertion into an active material coating portion is high. In the embodiments of the present application, the terminal assembly 2 is first connected to the cell assembly 3 and the terminal assembly 2 is then mounted on housing cover 12, so that during the connection of the terminal assembly 2 to the cell assembly 3, the length of the conductive portion 4 enables the cell assembly 3 to be located on the side of the terminal assembly 2 in the width direction, to reduce the length of the conductive portion 4 (for example, greater than a half of the width of the terminal assembly 2), reduce the redundancy of the conductive portion 4 after assembly, and reduce a risk of short circuit caused by the conductive portion 4 being reversely inserted into the cell bodies 32, thereby improving the reliability of the battery cell 102. In addition, the materials are saved and the costs are reduced for the conductive portion 4.

[0425] It is learned that, through the foregoing arrangement in the embodiments of the present application, an assembly position of the terminal assembly 2 on the housing assembly 1 is not limited, so that the terminal assembly 2 is disposed on the housing body 11, or the terminal assembly 2 is disposed on the housing cover 12, and the mounting position of the terminal assembly 2 is flexibly selected on the housing assembly 1, which is conducive to meeting production requirements of various types of battery cells 102. The terminal assembly 2 is disposed on the housing body 11, which is conducive to mitigating the problem of cracking at a connection between the housing body 11 and the housing cover 12, thereby improving the reliability of the battery cell 102. The terminal assembly 2 is disposed on the housing cover 12, which is conducive to reducing the length of the conductive portion 4, reducing the redundancy of the conductive portion 4 after assembly, and reducing a risk of reverse insertion, thereby improving the reliability of the battery cell 102.

[0426] According to a third aspect, an embodiment of the present application provides a battery 100, including the foregoing battery cell 102. It is to be noted that, the battery 100 according to the embodiments of the present application includes a box body 101 or does not include a box body 101. The reliability of the battery cell 102 according to the embodiments of the present application is enhanced, thereby improving the performance of the battery 100.

[0427] For example, the battery 100 further includes a busbar component. A plurality of battery cells 102 are provided, and at least two of the plurality of battery cells 102 are electrically connected by the busbar component. In this way, the plurality of battery cells 102 are connected in series and / or parallel. For example, when the plurality of battery cells 102 are connected in series, the terminal assembly 2 of the positive electrode of one battery cell 102 is connected to the terminal assembly 2 of the negative electrode of a next battery cell 102 by one busbar component, and the terminal assembly 2 of the negative electrode of the battery cell 102 is connected to the terminal assembly 2 of the positive electrode of a previous battery cell 102 by another busbar component.

[0428] For example, with reference to FIG. 2, the battery 100 includes a box body 101, a plurality of battery cells 102 are provided and accommodated in the box body 101, a box body bottom plate 1013 is provided at a bottom of the box body 101, and the cell assembly 3 is disposed on a side of the housing assembly 1 facing the box body bottom plate 1013, or is disposed on a side of the housing assembly 1 facing away from the box body bottom plate 1013.

[0429] In a use process of the battery 100, for example, during use in a vehicle, the box body bottom plate 1013 is located at a bottom of the box body 101 in a gravity direction. In this case, when the cell assembly 3 is disposed on the side of the housing assembly 1 facing the box body bottom plate 1013, it indicates that the cell assembly 3 is located at a bottom of the housing assembly 1 in the gravity direction. When the cell assembly 3 is disposed on the side of the housing assembly 1 facing away from the box body bottom plate 1013, it indicates that the cell assembly 3 is located at a top of the housing assembly 1 in the gravity direction. Therefore, relative positions of the terminal assembly 2 and the box body bottom plate 1013 are not limited, so that the orientations of the battery cell 102 and the box body 101 are flexibly set.

[0430] According to a fourth aspect, an embodiment of the present application provides an electric apparatus 1000, including the battery 100 in any foregoing solution. The battery 100 is configured to supply electric energy to the electric apparatus 1000. The electric apparatus 1000 is any foregoing device or system using the battery 100. The performance of the battery 100 is enhanced, thereby enhancing the operational electrical performance of the electric apparatus 1000.

[0431] The battery cells 102 and assembly methods therefor in several specific embodiments are described below.

[0432] Embodiment 1

[0433] With reference to FIG. 37A to FIG. 37E, the housing assembly 1 is provided with the accommodating cavity 13 and includes the housing body 11 that participates in defining the accommodating cavity 13. The opening 113 is provided at an end of the housing body 11. The housing cover 12 has a flat plate shape and covers the opening 113. A housing wall of an end of the housing body 11 opposite to the opening 113 is the first housing wall 111. The first housing wall 111 is provided with the mounting hole 112. The terminal assembly 2 is mounted on the first housing wall 111 and covers the mounting hole 112. The cell assembly 3 includes the plurality of cell subassemblies 31 that are stacked, the cell bodies 32 accommodated in the accommodating cavity 13, and the tab group 33 connected to the cell bodies 32. The tab group 33 is connected to the terminal assembly 2 by the adapter 5. A portion of the adapter 5 is accommodated in the accommodating groove 5 defined in the terminal assembly 2. The terminal assembly 2 is in a simplified form, and includes the terminal body 21, the adapter structure 22, and the insulating structure 23. The adapter structure 22 surrounds the terminal body 21. The insulating structure 23 is fitted between the terminal body 21 and the adapter structure 22 in an insulating manner. The adapter structure 22 is connected to the first housing wall 111. The terminal body 21 is connected to the tab group 33.

[0434] With reference to FIG. 37A to FIG. 37E, during the processing of the battery cell 102, the plurality of cell subassemblies 31 are stacked in the thickness direction (for example, the fourth direction F4) of the cell subassemblies 31. A plurality of layers of tab pieces 311 with the same polarity of the plurality of cell subassemblies 31 are stacked and connected to form the first gathered portion 332, and the first gathered portion 332 is then connected to the adapter 35. The cell assembly 3 is mounted into the housing body 11 in a direction of the tab group 33 facing the mounting hole 112 relative to the cell bodies 32. Along with the movement of the cell assembly 3 being mounted into the housing body 11, the adapter 35 extends to the outer side of the mounting hole 112. The adapter 35 and the terminal assembly 2 placed on the outer side of the first housing wall 111 are connected on the outer side of the first housing wall 111. Next, the terminal assembly 2 to which the adapter 35 is connected covers the mounting hole 112 from the outer side of the first housing wall 111, and subsequently the adapter structure 22 is welded and fixed to the first housing wall 111.

[0435] Because a welding position between the terminal assembly 2 and the gathered portion 313 is located outside the housing body 11, the problem that conductive debris formed in a welding process enters the housing body 11 to cause damage to the cell assembly 3 is mitigated.

[0436] Embodiment 2

[0437] With reference to FIG. 39A to FIG. 39D, the housing assembly 1 is provided with the accommodating cavity 13 and includes the housing body 11 that participates in defining the accommodating cavity 13. The opening 113 is provided at one end of the housing body 11. A housing wall of an end of the housing body 11 opposite to the opening 113 is the first housing wall 111. The first housing wall 111 is provided with the mounting hole 112. The terminal assembly 2 is mounted on the first housing wall 111 and covers the mounting hole 112. The cell assembly 3 includes the plurality of cell subassemblies 31 that are stacked, the cell bodies 32 accommodated in the accommodating cavity 13, and the tab group 33 connected to the cell bodies 32. The tab group 33 is connected to the terminal assembly 2. The terminal assembly 2 includes the terminal body 21, the adapter structure 22, and the insulating structure 23. The adapter structure 22 surrounds the terminal body 21. The insulating structure 23 is fitted between the terminal body 21 and the adapter structure 22 in an insulating manner. The adapter structure 22 is connected to the first housing wall 111. The terminal body 21 is connected to the tab group 33.

[0438] With reference to FIG. 39A to FIG. 39D, during the processing of the battery cell 102, the plurality of cell subassemblies 31 are stacked in the thickness direction (for example, the fourth direction F4) of the cell subassemblies 31. A plurality of layers of tab pieces 311 with the same polarity of the plurality of cell subassemblies 31 are stacked and connected to form the first gathered portion 332, and the first gathered portion 332 is then connected to the terminal assembly 2 by the adapter 35. the cell assembly 3 and the terminal assembly 2 connected to the first gathered portion 332 are mounted into the housing body 11 in a direction of the terminal assembly 2 facing the mounting hole 112 relative to the cell bodies 32. Along with the movement of the cell assembly 3 being mounted into the housing body 11, the terminal assembly 2 extends from the mounting hole 112 to the outer side of the first housing wall 111. Next, the terminal assembly 2 to which the gathered portion 313 is connected covers the mounting hole 112 from the outer side of the first housing wall 111, and subsequently the adapter structure 22 is welded and fixed to the first housing wall 111.

[0439] The terminal assembly 2 and the gathered portion 313 are not mounted into the housing body 11 during welding, so that the problem that conductive debris formed in a welding process enters the housing body 11 to cause damage to the cell assembly 3 is mitigated.

[0440] It is to be noted that in the foregoing embodiments, a form of the adapter structure 22 of the terminal assembly 2 is not limited, a form of the insulating structure 23 is not limited, and a configuration of the terminal body 21 is also not limited. Refer to any foregoing embodiment of the present application for details, which are described herein.

[0441] It is to be noted that the embodiments in the present application and the features in the embodiments are combinable with each other without causing any conflict.

[0442] The foregoing descriptions are merely preferred embodiments of the present application, but are not intended to limit the present application. Persons skilled in the art make various modifications and changes to the present application. Any modification, equivalent replacement, or improvement made without departing from the spirit and principle of the present application shall fall within the scope of protection of the present application.

Claims

1. A battery cell, comprising:a housing assembly, provided with an accommodating cavity and comprising a first housing wall that participates in defining the accommodating cavity;a terminal assembly, mounted on the first housing wall and comprising a terminal body; anda cell assembly, comprising cell bodies and an adapter, wherein the cell bodies are disposed in the accommodating cavity, end portions of the cell bodies are connected to a tab group, the tab group is electrically connected to the terminal body by the adapter, and the adapter supports a free end of the tab group.

2. The battery cell according to claim 1, wherein the tab group comprises a plurality of tab pieces, the plurality of tab pieces of the tab group converge and are connected at a position away from the cell bodies to form a first gathered portion at the free end, and at least a portion of the first gathered portion is connected at a position on a side of a portion of the adapter facing away from the cell bodies.

3. The battery cell according to claim 2, wherein the adapter comprises a first connecting portion and a second connecting portion, the first connecting portion is connected to the terminal assembly, the second connecting portion is connected to the first gathered portion and supports the first gathered portion,an orthographic projection of at least a portion of the first gathered portion onto the first housing wall is within a range of an orthographic projection of the second connecting portion onto the first housing wall, and a thickness of the second connecting portion is greater than or equal to that of the first gathered portion.

4. The battery cell according to claim 2 or 3, wherein the plurality of tab pieces of the tab group converge at a position close to the cell bodies to form a second gathered portion, one end of the second gathered portion is bent and connected to the first gathered portion, the other end of the second gathered portion is connected to the cell bodies, and an end surface of a portion of the adapter connected to the first gathered portion extends to a position close to the bend of the second gathered portion.

5. The battery cell according to any one of claims 1 to 4, wherein the tab group is bent to form a first open slot, the free end defines at least a portion of a slot wall of the first open slot on a side close to the terminal body, and the adapter extends into the first open slot and abuts against the free end.

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

7. The battery cell according to any one of claims 1 to 6, wherein a clamping structure is provided at an end of the adapter away from the terminal body, the clamping structure supports the free end and comprises two clamping portions disposed opposite to each other, and the free end is clamped between the two clamping portions and is connected to each of the clamping portions.

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

9. The battery cell according to claim 8, whereina thickness of the bent portion is less than that of at least one of the first connecting portion and the second connecting portion; and / orin an extension direction of a central axis of the bent portion, a width of the bent portion is less than that of at least one of the first connecting portion and the second connecting portion.

10. The battery cell according to any one of claims 1 to 9, wherein the adapter comprises a plurality of adapter foils, the plurality of adapter foils are stacked, partial regions of the stack are connected to form the first connecting portion and the second connecting portion that are spaced apart, the first connecting portion is connected to the terminal body, and the second connecting portion is connected to the free end.

11. The battery cell according to claim 10, wherein a portion 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 and connected to the first connecting portion and the second connecting portion.

12. The battery cell according to claim 10 or 11, wherein the plurality of adapter foils comprise 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 two sides of the free end in a thickness direction.

13. The battery cell according to any one of claims 1 to 12, wherein a plurality of cellbodies sequentially disposed in a second direction form one cell group, all the free ends of the cell group extend toward a middle position of the cell group in the second direction and are connected to form one first gathered portion, and the adapter supports the first gathered portion.

14. The battery cell according to claim 13, wherein in the second direction, a midpoint of the cell group in the second direction is used as a midpoint of the middle position, and a dimension of the middle position is less than or equal to 1 / 2 of that of one of the cell bodies.

15. The battery cell according to claim 13 or 14, wherein a plurality of cell groups are provided and are sequentially disposed in the second direction, and the adapter supports all the first gathered portions.

16. The battery cell according to claim 15, wherein the adapter comprises a body structure and a plurality of branch structures, the body structure is connected to the terminal body, each of the branch structures is connected to an end of the body structure away from the terminal body and comprises at least one level of branch segment, such that the adapter is configured as a fractal tree structure, and each last-level branch segment of the branch structure supports one first gathered portion.

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

18. The battery cell according to claim 16 or 17, wherein a connection position between the body structure and the branch structure is a middle position of all the cell groups in a first direction.

19. The battery cell according to any one of claims 13 to 18, whereina quantity of the cell bodies in the cell group is odd or even; and / orquantities of the cell bodies in the plurality of cell groups are equal or unequal.

20. The battery cell according to any one of claims 1 to 19, further comprising:an insulating assembly, disposed in the accommodating cavity, and formed with a through hole, wherein the insulating assembly is interposed between the cell bodies and a portion of the tab group and / or a portion of the adapter passing through the through hole to a side of the insulating assembly facing away from the cell bodies.

21. The battery cell according to claim 20, wherein the insulating assembly comprises:an insulating film, completely wrapping the cell bodies, wherein the through hole isformed at a position of the insulating film opposite to the first housing wall, and a portion of the insulating film surrounding the through hole is interposed between the cell bodies and a portion of the tab group passing through the through hole to a side of the insulating film facing the terminal body.

22. The battery cell according to claim 20 or 21, wherein the insulating assembly comprises:an insulating bracket, disposed on a side of the cell bodies facing the first housing wall, wherein the through hole is formed at a position of the insulating bracket opposite to the terminal assembly, and a portion of the insulating bracket surrounding the through hole is interposed between the adapter and the cell bodies.

23. The battery cell according to any one of claims 1 to 22, wherein the terminal assembly further comprises an adapter structure and an insulating structure, the adapter structure surrounds the terminal body and is connected to the first housing wall, and the insulating structure is fitted between the adapter structure and the terminal body in an insulating manner.

24. The battery cell according to claim 23, wherein the insulating structure comprises a sealing structural member, the sealing structural member is disposed around a peripheral side of the adapter structure facing the terminal body, and at least a portion of the sealing structural member is clamped between the adapter structure and the terminal body in an inner-outer direction of the first housing wall.

25. The battery cell according to claim 24, wherein the terminal body comprises a peripheral portion, the adapter structure is clamped on two sides of the peripheral portion in the inner-outer direction of the first housing wall through the insulating structure, and the sealing structural member is clamped between the adapter structure and a side of the peripheral portion facing the cell assembly.

26. The battery cell according to claim 24, wherein the adapter structure comprises a mating ring portion, the terminal body comprises a penetrating portion passing through the mating ring portion and an inner limiting portion and an outer limiting portion that are connected to the penetrating portion and clamped on two sides of the mating ring portion, and at least a portion of the sealing structural member is clamped between the mating ring portion and the inner limiting portion.

27. The battery cell according to any one of claims 1 to 26, wherein the terminal assembly defines an accommodating groove recessed away from the cell assembly relative to the first housing wall and open toward the cell assembly, and at least a portion of the adapter is accommodated in the accommodating groove.

28. The battery cell according to any one of claims 1 to 27, wherein the housing assembly comprises a housing body and a housing cover, the housing body is integrally formed and open at one end, and the housing cover is disposed at the open end of the housing body, andan end of the housing body opposite to the housing cover is the first housing wall; orthe housing cover is the first housing wall.

29. The battery cell according to any one of claims 1 to 28, further comprising:a pressure relief assembly, disposed on the housing assembly, and located on the same side as or a different side from the terminal assembly.

30. A processing method, wherein the processing method is used for processing the battery cell according to any one of claims 1 to 29, and the processing method comprises:mounting the cell assembly into the accommodating cavity, such that an end of the cell assembly provided with the tab group is on an inner side of the first housing wall and disposed opposite to the first housing wall; andmounting the terminal assembly on the first housing wall, and connecting the tab group to the terminal body by the adapter, such that the adapter supports the free end of the tab group.

31. The processing method according to claim 30, wherein a mounting hole is formed in the first housing wall; andthe step of mounting the terminal assembly on the first housing wall, and connecting the tab group to the terminal body by the adapter, such that the adapter supports the free end of the tab group comprises:connecting one end of the adapter to the tab group, and passing the other end of the adapter through the mounting hole to extend to an outer side of the first housing wall to be connected to the terminal body; andcovering the mounting hole from the inner side or outer side of the first housing wall with the terminal assembly to which the adapter is connected; orthe step of mounting the terminal assembly on the first housing wall, and connecting the tab group to the terminal body by the adapter, such that the adapter supports the free end of the tab group comprises:placing the cell assembly on the inner side of the first housing wall, connecting one end of the adapter to the tab group, and connecting the other end of the adapter to the terminal body; andcovering the mounting hole from the inner side or outer side of the first housing wall with the terminal assembly to which the adapter is connected after the terminal assembly passes through the mounting hole.

32. The processing method according to claim 31, wherein the tab group comprises the plurality of tab pieces;before the tab group is connected to the adapter, the method further comprises: converging the plurality of tab pieces to form a laminated portion at the free end; andthe step of connecting one end of the adapter to the tab group comprises:connecting the plurality of tab pieces of the tab group at a position of the laminated portion to form the first gathered portion, and connecting at least a portion of the first gathered portion to the adapter; orconnecting at least a portion of the laminated portion to the adapter.

33. The processing method according to claim 31 or 32, wherein the clamping structure is provided at the end of the adapter away from the terminal body and comprises the two clamping portions disposed opposite to each other; andthe step of connecting one end of the adapter to the tab group comprises:clamping the free end from two sides of the free end with the two clamping portions; and connecting the two clamping portions to the free end.

34. The processing method according to any one of claims 31 to 33, wherein the adapter comprises the plurality of adapter foils;before one end of the adapter is connected to the tab group, the method further comprises: stacking the plurality of adapter foils; andconnecting the partial regions of the stack to form the first connecting portion; andthe step of connecting one end of the adapter to the tab group, and connecting the other end of the adapter to the terminal body comprises:connecting the partial regions of the stack of the plurality of adapter foils to the free end, such that the partial regions of the stack form the second connecting portion spaced apart from the first connecting portion; andconnecting the first connecting portion to the terminal body.

35. The processing method according to any one of claims 31 to 34, wherein the step of covering the mounting hole from the inner side or outer side of the first housing wall with the terminal assembly to which the adapter is connected, or covering the mounting hole from the inner side or outer side of the first housing wall with the terminal assembly to which the adapter is connected after the terminal assembly passes through the mounting hole comprises:bending a portion of the tab group and the adapter being connected located between the first housing wall and the cell bodies into a bent shape when the terminal assembly is mounted on the first housing wall.

36. The processing method according to claim 35, wherein the battery cell comprises an insulating bracket located on the inner side of the first housing wall; andthe step of bending a portion of the tab group and the adapter being connected located between the first housing wall and the cell bodies into a bent shape when the terminal assembly is mounted on the first housing wall comprises:bending, when the terminal assembly is mounted on the first housing wall, the portion of the tab group and the adapter being connected located between the first housing wall and the cell bodies to form the first open slot, wherein the free end defines at least a portion of the slot wall of the first open slot on the side close to the terminal body; andinserting a portion of the insulating bracket into the first open slot.

37. The processing method according to claim 35, wherein the battery cell comprises an insulating bracket located on the inner side of the first housing wall; andthe step of bending a portion of the tab group and the adapter being connected located between the first housing wall and the cell bodies into a bent shape when the terminal assembly is mounted on the first housing wall comprises:bending, when the terminal assembly is mounted on the first housing wall, the portion of the tab group and the adapter being connected located between the first housing wall and the cell bodies to form the first open slot and the second open slot that is adjacent to the first open slot and located on the side of the first open slot facing the terminal body, wherein the opening directions of the second open slot and the first open slot are arranged at an angle; andinserting portions of the insulating bracket into the first open slot and the second open slot.

38. The processing method according to any one of claims 35 to 37, whereinthe step of connecting the other end of the adapter to the terminal body comprises:adjusting an angle of the terminal assembly, such that a normal direction of an inner end surface of the terminal body approaches a stacking direction of the plurality of cell bodies; andthe step of covering the mounting hole with the terminal assembly to which the adapter is connected comprises:adjusting the angle of the terminal assembly from the outer side of the first housing wall, such that the normal direction of the inner end surface of the terminal body approaches a direction perpendicular to the stacking direction of the plurality of cell bodies, the tab group is bent and deformed to form the first open slot, the adapter is bent and deformed to form the second open slot, and the opening directions of the first open slot and the second open slot are arranged at an angle.

39. The processing method according to any one of claims 30 to 38, wherein the housing assembly comprises the housing body and the housing cover, and the housing body is provided with an opening; andwhen an end wall of the housing body opposite to the opening is the first housing wall, the step of mounting the cell assembly into the accommodating cavity, such that an end of the cell assembly provided with the tab group is on an inner side of the first housing wall and disposed opposite to the first housing wall comprises:mounting the cell assembly into the accommodating cavity from the opening;extending the tab group from the mounting hole, such that the end of the cell assembly provided with the tab group is on the inner side of the first housing wall and disposed opposite to the first housing wall; andcovering the opening with the housing cover; orwhen the housing cover is the first housing wall, the step of mounting the cell assembly into the accommodating cavity, such that an end of the cell assembly provided with the tab group is on an inner side of the first housing wall and disposed opposite to the first housing wall comprises:supporting the cell assembly on an inner side of the housing cover;extending the tab group from the mounting hole, such that the end of the cell assembly provided with the tab group is on the inner side of the first housing wall and disposed opposite to the first housing wall; andsleeving the housing body over an outer side of the cell assembly, and connecting the housing body to the housing cover.

40. The processing method according to claim 39, whereinwhen the end wall of the housing body opposite to the opening is the first housing wall, before the cell assembly is mounted into the accommodating cavity from the opening, the method further comprises: wrapping the insulating film around an outer side of the cell bodies; orwhen the housing cover is the first housing wall, before the housing body is sleeved over the outer side of the cell assembly, the method further comprises: wrapping the insulating film around an outer side of the cell bodies.

41. A battery, comprising the battery cell according to any one of claims 1 to 29.

42. The battery according to claim 41, wherein the battery comprises a box body, a plurality of battery cells are provided and accommodated in the box body, a box body bottom plate is provided at a bottom of the box body, and the terminal assembly is disposed on a sideof the housing assembly facing the box body bottom plate, or is disposed on a side of the housing assembly facing away from the box body bottom plate.

43. An electric apparatus, comprising the battery according to claim 41 or 42.

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