Battery cell, battery and electric device

Abstract

A battery cell, a battery and an electric device. The battery cell comprises a casing component, a terminal post component and an electrode component, wherein the casing component comprises a mounting wall; the terminal post component is mounted on the mounting wall and comprises a terminal post body; the electrode component is accommodated in an accommodating cavity and comprises an active material coating portion, an electrically conductive portion and an insulating member; the electrically conductive portion is connected between the active material coating portion and the terminal post body; at least part of the insulating member is arranged between the end of the active material coating portion connected to the electrically conductive portion and the terminal post body; the insulating member is provided with an avoidance hole; and the insulating member is blocked between the part of the electrically conductive portion passing through the insulating member and connected to the terminal post body and the active material coating portion. In the technical solutions of the embodiments of the present application, the insulating member can reduce the risk of the mounting wall of the casing component corroding due to the exposure of the active material coating portion, and can also reduce the probability of the electrically conductive portion being incorrectly inserted into the active material coating portion due to redundancy, thereby being conducive to improving the operational reliability of the battery cell.

Description

Battery cell, battery and electric device TECHNICAL FIELD

[0001] The present application relates to the field of battery, in particular to a battery cell, a battery and an electric device. BACKGROUND

[0002] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy saving and environmental protection advantages. For electric vehicles, battery technology is an important factor for their development.

[0003] In the related art, the tab of the battery cell can be inserted into the active material coating part, which can cause the battery cell to easily short circuit. This makes the reliability of the battery cell to be improved, which hinders the further improvement of the reliability of the battery.

[0004] SUMMARY

[0005] In view of the above problems, the present application provides a battery cell, a battery and an electric device, which can reduce the risk of short circuit and improve the use reliability.

[0006] In a first aspect, the present application provides a battery cell, comprising a shell part, a pole part and an electrode part, the shell part defines a receiving cavity and comprises a mounting wall; the pole part is mounted on the mounting wall and comprises a pole body; the electrode part is received in the receiving cavity and comprises an active material coating part, a conductive part and an insulating part, the conductive part connects between the active material coating part and the pole body; at least part of the insulating part is arranged between the end part of the active material coating part connected with the conductive part and the pole body; the insulating part is provided with a avoiding hole for the conductive part to pass through; the insulating part blocks the part of the conductive part passing through the insulating part and connecting with the pole body from the active material coating part.

[0007] In the technical scheme of the present application, the insulating part can play an insulating role, on the one hand, it can isolate the active material coating part from the mounting wall of the shell part, reduce the probability of contact between the active material coating part and the mounting wall of the shell part, thereby reducing the risk of corrosion of the mounting wall of the shell part caused by the bare leakage of the active material coating part, reducing the risk of failure of the active material coating part itself, and reducing the risk of liquid leakage, thereby improving the reliability and stability of the battery cell, on the other hand, it can isolate the part of the conductive part passing through the insulating part from the active material coating part, reduce the probability of the conductive part being inserted into the active material coating part due to redundancy, thereby reducing the risk of short circuit of the battery cell, and improving the use reliability of the battery cell.

[0008] In some embodiments, the avoiding hole includes a first avoiding hole, and the insulating piece includes: an insulating film, the insulating film fully covering the active material coating part, the first avoiding hole being arranged at a position opposite to the mounting wall of the insulating film and being adapted to the thickness of the conductive part, and the insulating film forming a circumferential wall of the first avoiding hole to block between the conductive part passing through the first avoiding hole and connecting with the pole body of the pole part and the active material coating part. In the above technical solution, by adapting the size of the first avoiding hole to the thickness of the conductive part, on the one hand, the first avoiding hole allows the conductive part to pass through the insulating film, so that the conductive part can be electrically connected with the pole body of the pole part, and on the other hand, in the state of passing through the first avoiding hole, the insulating film can also cover the positions of the plurality of tabs of the conductive part adjacent to the root of the active material coating part, further insulating and protecting the active material coating part, reducing the risk of the active material coating part being exposed, and insulating and protecting the plurality of tabs of the conductive part adjacent to the root of the active material coating part, so that the part of the conductive part passing through the first avoiding hole is separated from the active material coating part and the plurality of tabs of the conductive part adjacent to the root of the active material coating part, reducing the probability of the conductive part being inserted into the active material coating part and the plurality of tabs of the conductive part adjacent to the root of the active material coating part due to redundancy, thereby reducing the risk of short circuit of the battery monomer.

[0009] In some embodiments, the first avoiding hole is a normally open hole adapted to the thickness of the conductive part. In the above technical solution, by setting the first avoiding hole as a normally open hole, the conductive part can quickly pass through the insulating film, which is conducive to improving the efficiency of the insulating film wrapping the active material coating part, thereby improving the assembly efficiency of the battery monomer. In the process of the conductive part passing through the insulating film, the conductive part can avoid the insulating film, thereby reducing the probability of deformation of the conductive part, reducing the operation steps of shaping the conductive part, and further improving the assembly efficiency of the battery monomer.

[0010] In some embodiments, the position opposite to the mounting wall of the insulating film is provided with a tearing structure adapted to be torn by the conductive part to form a first avoiding hole adapted to the thickness of the conductive part. In the above technical solution, by pre-providing the tearing structure on the insulating film, during the process of wrapping the insulating film on the outside of the active material coating part, a first avoiding hole that can be opened and closed can be formed. After the conductive part is inserted in place, the first avoiding hole can gradually tend to be closed, so that the insulating film can cover at least part of the plurality of tabs of the conductive part adjacent to the root of the active material coating part, thereby insulating and protecting the plurality of tabs of the conductive part adjacent to the root of the active material coating part, so that the part of the conductive part passing through the first avoiding hole is separated from the plurality of tabs of the conductive part adjacent to the root of the active material coating part, reducing the probability of the conductive part being inserted into the inside of the active material coating part and the plurality of tabs of the conductive part adjacent to the root of the active material coating part due to redundancy, thereby reducing the risk of short circuit of the battery monomer.

[0011] In some embodiments, the tearing structure comprises: a first tearing portion extending along a length direction of the pole body; a second tearing portion extending along a direction at an angle to the length direction of the pole body, and an end of the first tearing portion is connected to the second tearing portion. In the above technical solution, by setting the tearing structure to comprise the first tearing portion and the second tearing portion arranged at an angle, the first avoiding hole formed can be opened and closed, the insulating film can adjust the opening degree of the first avoiding hole according to the shape of the root of the conductive portion adjacent to the active material coating portion, the conductive portion can be smoothly arranged in the first avoiding hole, the risk of the insulating film being severely torn can be reduced, the insulation protection performance of the insulating film on the active material coating portion is further improved, the probability of the conductive portion being reversely inserted into the inside of the active material coating portion due to redundancy is further reduced, and thus the risk of short circuit of the battery monomer is further reduced.

[0012] In some embodiments, the end of the first tearing portion is connected to the middle of the second tearing portion; and / or, the number of the second tearing portions is two, and the two second tearing portions are arranged at intervals to be respectively connected to the two ends of the first tearing portion; and / or, the second tearing portion extends along a width direction of the pole body. In the above technical solution, by connecting the end of the first tearing portion to the middle of the second tearing portion, the insulating film can form at least two openable and closable insulating pieces at the tearing structure, the two insulating pieces can cover at least opposite sides of the plurality of tab pieces of the conductive portion adjacent to the root of the active material coating portion, the probability of the conductive portion being reversely inserted into the inside of the active material coating portion and the plurality of tab pieces of the conductive portion adjacent to the root of the active material coating portion due to redundancy is reduced, and thus the risk of short circuit of the battery monomer is further reduced; by setting the number of the second tearing portions to be two, the adjustable opening degree of the first avoiding hole can be increased, the risk of the insulating film being severely torn can be further reduced, and thus the risk of short circuit of the battery monomer is further reduced; by extending the second tearing portion along the width direction of the pole body, the structural integrity of the insulating film at the first avoiding hole can be improved without affecting the effect of the conductive portion passing through the insulating film, and thus the insulation protection performance of the insulating film is improved, the probability of the conductive portion being reversely inserted into the inside of the active material coating portion due to redundancy can be further reduced, and thus the risk of short circuit of the battery monomer is further reduced.

[0013] In some embodiments, the insulation film comprises: a main insulation part wrapping the periphery of the active material coating part; a first insulation part and a second insulation part respectively arranged at two ends of the main insulation part, the first insulation part is located at the side of the main insulation part close to the mounting wall and wraps the end of the active material coating part close to the mounting wall, and the second insulation part is located at the side of the main insulation part away from the mounting wall and wraps the end of the active material coating part away from the mounting wall; wherein the first avoiding hole is arranged in the first insulation part. In the above technical solution, the insulation film is composed of multiple parts, which can completely separate the active material coating part from the shell part, so as to sufficiently reduce the exposure of the active material coating part, reduce the risk of failure and damage of the electrode part, reduce the risk of corrosion of the shell part, and improve the reliability and stability of the battery monomer.

[0014] In some embodiments, the insulation film is connected with a retaining sheet around at least part of the circumferential direction of the first avoiding hole, and the hardness of the retaining sheet is greater than the hardness of the insulation film. In the above technical solution, by connecting the retaining sheet on the insulation film, the rigidity of the insulation film at the first avoiding hole can be increased, which can enhance the barrier effect of the part of the conductive part passing through the first avoiding hole and the active material coating part, further reduce the probability of the part of the conductive part passing through the first avoiding hole and the multiple tab sheets of the conductive part being inserted into the root part of the active material coating part, thereby greatly reducing the risk of short circuit of the battery monomer.

[0015] In some embodiments, the avoiding hole comprises a second avoiding hole arranged opposite to the first avoiding hole, and the insulation part further comprises: an insulation support comprising a support body arranged at one end of the active material coating part close to the mounting wall and covering at least part of the insulation film on the end of the active material coating part facing the mounting wall, and the second avoiding hole is arranged in the support body. The conductive part passes through the first avoiding hole and is connected with the pole body at the second avoiding hole or passes through the second avoiding hole. In the above technical solution, the support body can support the active material coating part and also isolate the active material coating part and the mounting wall of the shell part, thereby reducing the probability of the active material coating part contacting the mounting wall, reducing the risk of corrosion of the mounting wall of the shell part due to the exposure of the active material coating part, reducing the risk of liquid leakage, and thereby improving the reliability and stability of the battery monomer.

[0016] In some embodiments, the second avoiding hole has a first hole wall and a second hole wall oppositely arranged in the width direction of the pole body, and the insulating support further comprises: a first partition sheet arranged at the first hole wall and connected with the support body, the first partition sheet extends towards the center of the second avoiding hole, and blocks the part of the conductive part connected with the pole body and the active material coating part. In the above technical solution, by arranging the first partition sheet at the second avoiding hole, the first partition sheet can block the part of the conductive part protruding out of the first avoiding hole and the active material coating part, reducing the probability of the conductive part being inserted into the active material coating part due to redundancy, thereby reducing the risk of short circuit of the battery monomer, and improving the use reliability of the battery monomer.

[0017] In some embodiments, the insulating support further comprises: a second partition sheet arranged at the second hole wall and connected with the support body, the second partition sheet extends towards the center of the second avoiding hole, and is arranged in a spaced manner with the first partition sheet, and a through hole communicated with the second avoiding hole is formed between the first partition sheet and the second partition sheet, the conductive part is arranged in the through hole, and the first partition sheet and the second partition sheet block the part of the conductive part connected with the pole body and the active material coating part on both sides of the through hole. In the above technical solution, by arranging the insulating support to comprise the first partition sheet and the second partition sheet, the first partition sheet and the second partition sheet can block the part of the conductive part protruding out of the through hole and the active material coating part, further reducing the probability of the conductive part being inserted into the active material coating part due to redundancy, thereby reducing the risk of short circuit of the battery monomer, and improving the use reliability of the battery monomer.

[0018] In some embodiments, the battery monomer comprises an insulating film, the insulating film covers the active material coating part, and a through hole exposing the conductive part is arranged on the insulating film towards the end of the mounting wall; the insulating piece is an insulating support, the insulating support is arranged at the end of the active material coating part close to the mounting wall, and covers at least part of the insulating film on the end of the active material coating part towards the mounting wall, and an avoiding hole is arranged in the insulating support, and the conductive part passes through the through hole and the avoiding hole to be connected with the pole body. The insulating support can support the active material coating part, isolate the active material coating part and the mounting wall of the shell part, reduce the probability of the active material coating part contacting the mounting wall, thereby reducing the risk of the active material coating part being corroded by the mounting wall due to bare exposure, reducing the risk of liquid leakage, and thereby improving the reliability and stability of the battery monomer.

[0019] In some embodiments, the insulating support is arranged between the active material coating portion and the opposite sides of the portion of the conductive portion that passes through the avoidance hole and is connected to the pole body. In the above technical solution, the insulating support is arranged between the active material coating portion and the opposite sides of the portion of the conductive portion that passes through the avoidance hole, which can further reduce the probability of the conductive portion being inserted into the inside of the active material coating portion by redundancy, thereby reducing the risk of short circuit of the battery monomer and facilitating improvement of the use reliability of the battery monomer.

[0020] In some embodiments, the conductive portion includes an approaching segment, a first extending segment and a second extending segment arranged in the extending direction of the conductive portion, the approaching segment is connected to the active material coating portion, the second extending segment is connected to the pole body, and the two ends of the first extending segment are respectively connected to the approaching segment and the second extending segment; the first extending segment is arranged in the avoidance hole, and the approaching segment and the second extending segment are respectively located on the two sides of the insulating member. The insulating member can separate the approaching segment and the second extending segment, thereby reducing the probability of the second extending segment being inserted into the approaching segment by redundancy, and the insulating member can also separate the second extending segment and the active material coating portion, thereby reducing the probability of the second extending segment being inserted into the inside of the active material coating portion by redundancy, thereby reducing the risk of short circuit of the battery monomer and improving the reliability and stability of the battery monomer.

[0021] In some embodiments, the conductive portion includes a plurality of tab pieces arranged in layers, the plurality of tab pieces are close to each other adjacent to the root of the active material coating portion to form a triangular approaching segment; and the plurality of tab pieces are close to each other and connected to form the first extending segment and the second extending segment at the position of the approaching segment away from the active material coating portion. In the above technical solution, the plurality of tab pieces are close to each other adjacent to the root of the active material coating portion to form a triangular approaching segment, so that the plurality of tab pieces can be arranged in layers and form an integral whole that is not easy to loosen, thereby facilitating the connection of the conductive portion and the pole body.

[0022] In some embodiments, the first end of the first extension section is connected to the converging section through a first bending part, and a first open slot is defined among the first end of the first extension section, the converging section and the first bending part; the second end of the first extension section is connected to the second extension section through a second bending part, and a second open slot is defined among the second end of the first extension section, the second extension section and the second bending part; the openings of the first open slot and the second open slot are in different directions and are arranged in the thickness direction of the wall; and the insulating member at least partially extends into the first open slot to block between the first extension section and the active material coating portion. By arranging the conductive portion in a substantially "S" shape, on the one hand, the conductive portion can play a better buffering role, and when the battery monomer is used in a vibrating environment, the vibration can be absorbed to protect the electrode component and improve the reliability of the battery monomer; on the other hand, by providing the first open slot and the second open slot, the conductive portion is regularly bent, and the bent part is less likely to be inserted into the interior of the active material coating portion due to redundancy, thereby reducing the risk of short circuit of the battery monomer and improving the mutual interference and rubbing between the tab pieces in the conductive portion, reducing the lithium precipitation phenomenon, and further improving the reliability of the battery monomer. The insulating member can isolate the side of the first extension section facing the active material coating portion from the active material coating portion, reducing the probability of the first extension section of the conductive portion being inserted into the interior of the active material coating portion due to redundancy, thereby reducing the risk of short circuit of the battery monomer and improving the use reliability of the battery monomer.

[0023] In some embodiments, the insulating member at least partially extends in the direction close to the second open slot to block between the second extension section and the active material coating portion. The insulating member can block between the second extension section and the side of the first extension section away from the active material coating portion, or block between the second extension section and the side of the converging section away from the active material coating portion, thereby blocking between the second extension section and the active material coating portion, further reducing the probability of the second extension section being inserted into the interior of the active material coating portion due to redundancy, the first extension section or the converging section, thereby reducing the risk of short circuit of the battery monomer and improving the use reliability of the battery monomer.

[0024] In some embodiments, the converging section, the first extension section and the second extension section define a third open slot, and the insulating member at least partially extends into the third open slot to block between the second extension section and the active material coating portion. The insulating member blocks between the second extension section and the active material coating portion, which can reduce the probability of the second extension section being inserted into the interior of the active material coating portion due to redundancy, the converging section, thereby reducing the risk of short circuit of the battery monomer and improving the use reliability of the battery monomer.

[0025] In some embodiments, the conductive portion includes a tab, and the tab includes a plurality of tab pieces stacked and arranged, and the converging section, the first extension section and the second extension section are formed by different parts of the tab. The tab is directly connected to the pole body, which can save the conductive member and the connection step of the conductive member and the tab, thereby improving the production efficiency of the battery monomer.

[0026] In some embodiments, the conductive part comprises: a tab connected to the active material coated part near one end of the mounting wall, and the tab comprises a plurality of tab pieces stacked and arranged; a conductive piece connected between the tab and the pole body, a part of the conductive piece forms the second extension section and another part forms at least part of the first extension section, and at least part of the tab forms the approaching section. By indirectly connecting the tab and the pole body through the conductive piece, the length of the tab can be shortened, and the problems such as wrinkling, bending and breaking of the tab piece can be improved, and by flexibly designing the shape and material of the conductive piece, the connection difficulty between the conductive piece and the pole body can be reduced, and the connection convenience of the conductive piece and the pole body can be improved. In addition, the perforation operation of the tab, the connection operation of the tab and the pole part (which can also be absent), and the connection operation of the pole part and the shell part, are not easy to cause the connection position between the active material coated part and the conductive part to crack, thereby improving the reliability of the battery monomer.

[0027] In some embodiments, the conductive piece comprises a transition piece, and the transition piece comprises a plurality of transition foil pieces stacked and connected, so that the transition piece is deformable. Since the plurality of transition foil pieces have small thickness, the plurality of transition foil pieces are equivalent to multiple layers of thin plates, and the transition piece formed by the plurality of transition foil pieces is more easily bent than an integrally formed transition piece, so that the transition piece and the tab can be bent as needed, thereby making the conductive part form a predetermined shape, and thereby meeting the design needs.

[0028] In some embodiments, the pole part further comprises a transition structure and an insulation structure, the transition structure surrounds the pole body and is connected to the mounting wall, and the insulation structure is insulated and sealingly fitted between the transition structure and the pole body. In the above technical solution, the structure of the pole part is simple and convenient to process, and since the pole part comprises two parts of the pole body and the transition structure, the shape and size of the pole body and the shape and size of the transition structure can be designed separately based on different factors to flexibly adapt to the connection needs of different forms of shell parts and electrode parts, thereby increasing the application range of the pole part.

[0029] In some embodiments, the transition structure is formed in a long strip shape extending along the length direction of the mounting wall, and the contour shape of the pole body matches the contour shape of the transition structure; or the transition structure is formed in a long strip shape extending along the length direction of the mounting wall, and the pole body is arranged at the length center position of the transition structure and is circular. In the above technical solution, when the contour shape of the pole body is formed in a long strip shape matching the contour shape of the transition structure, the area of the pole body is large, which is conducive to improving the connection area of the conductive part and the pole body, thereby improving the conductivity. When the pole body is arranged at the length center position of the long strip-shaped transition structure and is circular, it is conducive to reducing the connection area of the pole body and the transition structure, improving the stress uniformity at the connection between the pole body and the transition structure, and thereby improving the connection reliability of the pole body and the transition structure.

[0030] In some embodiments, the insulating structure includes a sealing structure member, which is circumferentially disposed on the side of the adapter structure facing the pole body, and at least partially clamped between the adapter structure and the pole body in the inward and outward directions of the mounting wall. In the above technical solution, by setting at least a portion of the sealing structure member to be clamped between the adapter structure and the pole body in the inward and outward directions of the mounting wall, an axial seal is achieved between the adapter structure and the pole body. This axial seal provides a more reliable sealing effect, improving the leakage problem at the mating position of the adapter structure and the pole body. Furthermore, the embodiments of this application, by integrating the axial seal into the pole component, can reduce the axial force on the mounting wall. Moreover, by circumferentially disposing the sealing structure member within the inner ring of the adapter structure, the sealing structure member can be close to the mating position of the adapter structure and the pole body, facilitating a shorter path for sealing the mating position, improving sealing reliability, and reducing the size of the sealing structure member and sealing area. This makes it easier to achieve compression sealing, reducing the likelihood of seal failure and improving the sealing effect.

[0031] In some embodiments, the mounting wall has a mounting hole, the electrode post component covers the mounting hole, and the edge of the adapter structure overlaps one side of the mounting wall in the wall thickness direction. This technical solution facilitates the assembly of the adapter structure and the mounting wall, improving production efficiency. When the edge of the adapter structure overlaps the side of the mounting wall away from the electrode component, it facilitates the assembly and connection of the electrode post component and the mounting wall, improving the connection reliability between the electrode post component and the mounting wall. When the edge of the adapter structure overlaps the side of the mounting wall facing the electrode component, the electrode component and the electrode post component can be installed together into the housing, eliminating the need for the electrode post component to pass through the mounting hole, thereby reducing operational steps and simplifying operation.

[0032] In some embodiments, the edge of the adapter structure overlaps with the side of the mounting wall away from the electrode component. The mounting wall has a first recessed groove surrounding the mounting hole, which opens towards the direction away from the electrode component. The edge of the adapter structure has a flange portion embedded in the first recessed groove. In the above technical solution, it is convenient to support and position the connection between the adapter structure and the mounting wall, and it is beneficial for the two to be welded together from the outside of the mounting wall.

[0033] In some embodiments, the edge of the adapter structure overlaps with the side of the mounting wall opposite to the electrode component, the mounting hole is an elongated hole, and the electrode post component is formed into an elongated structure that matches the shape of the mounting hole. In the above technical solution, the space required for the flipping movement of the electrode post component is small, which can reduce the space required for the flipping of the electrode post component, thereby helping to shorten the length of the conductive part, save materials, reduce costs, and reduce the redundancy of the conductive part, reducing the space occupied by the conductive part in the cavity, which is beneficial to improving the energy density of the battery cell.

[0034] In some embodiments, the edge of the adapter structure overlaps with the side of the mounting wall facing the electrode component. The edge of the adapter structure has a second recessed groove that opens in a direction away from the electrode component. The mounting wall includes an overlapping portion protruding into the mounting hole, and the overlapping portion is embedded in the second recessed groove. In the above technical solution, it is convenient to support and position the connection between the electrode component and the mounting wall, and it is beneficial for the two to be welded together from the outside of the mounting wall.

[0035] In some embodiments, the electrode post component forms a first receiving groove with its mounting wall recessed away from the electrode component and open towards the electrode component. The electrode component is connected to the electrode post component via a conductive portion, and at least a portion of the conductive portion is received in the first receiving groove and connected to the electrode post body. In the above technical solution, by providing a first receiving groove to accommodate the conductive portion, the space occupied by the conductive portion in the receiving cavity can be reduced, allowing the receiving cavity to have a larger space to accommodate the active material coating portion. This is beneficial for increasing the volume of the active material coating portion, thereby increasing the energy density of the battery cell. Moreover, since the first receiving groove is open towards the electrode component, the conductive portion can easily extend into the first receiving groove, reducing operational difficulty.

[0036] In some embodiments, the electrode post body has a second receiving groove, which is open away from the receiving cavity, and the bottom wall of the second receiving groove has a through hole. The conductive part passes through the through hole and is at least partially received in the second receiving groove. In the above technical solution, on the one hand, the electrode post body is provided with a second receiving groove, which can reduce the weight of the electrode post body to a certain extent, thereby improving the weight energy density of the battery cell and the battery. On the other hand, since the opening of the second receiving groove is formed on the outer end face of the electrode post body, and the outer end face of the electrode post body is the surface of the electrode post body away from the active material coating part, the second receiving groove can be opened in the direction away from the active material coating part. In this way, when at least part of the conductive part is received in the second receiving groove, the conductive part can be easily stored and organized through the opening of the second receiving groove, and the electrical connection operation between the conductive part and the electrode post body can be easily performed through the opening of the second receiving groove, thereby reducing the production difficulty of the battery cell and improving the production efficiency of the battery cell.

[0037] In some embodiments, the housing component includes a housing body with an opening and a housing cover, the housing cover closing onto the opening; the mounting wall includes a wall body disposed opposite to the opening, and / or, the mounting wall includes the housing cover. In the above technical solutions, flexible arrangement of the pole piece can be achieved.

[0038] Secondly, this application provides a battery that includes the battery cell described in the above embodiments.

[0039] In the technical solution of this application embodiment, by using the above-mentioned battery cell, the risk of failure of the active material coating part itself can be reduced, the risk of leakage can be reduced, and the risk of short circuit of the battery cell can also be reduced, thereby improving the reliability and stability of the battery cell and thus improving the reliability of battery use.

[0040] In some embodiments, the battery includes a housing, multiple battery cells housed within the housing, and a bottom plate at the bottom of the housing. Terminal posts are located on either the side of the housing component facing the bottom plate or the side of the housing component away from the bottom plate. In the above technical solution, when the terminal posts of the battery cells are located on the side of the housing component facing the bottom plate, the battery cells are inverted, and the depressurized products are ejected in a direction away from the passenger compartment, which is safer. When the terminal posts of the battery cells are located on the side of the housing component near the bottom plate, the battery cells are upright, and electrolyte leakage is less likely. Therefore, flexible positioning of the battery cells and the housing can be achieved.

[0041] Thirdly, this application provides an electrical device that includes the battery cell in the above embodiments; or, includes the battery in the above embodiments.

[0042] In the technical solutions of this application embodiment, by using the above-mentioned battery cells or batteries, the reliability of the electrical device can be improved.

[0043] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0044] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0045] Figure 1 is a schematic diagram of the vehicle structure according to some embodiments of this application;

[0046] Figure 2 is an exploded view of a battery according to some embodiments of this application;

[0047] Figure 3 is a schematic diagram of the structure of a battery cell according to some embodiments of this application;

[0048] Figure 4 is a structural cross-sectional view of a battery cell according to some embodiments of this application;

[0049] Figure 5 is a partial enlarged view of the battery cell shown in Figure 4;

[0050] Figure 6 is a schematic diagram of the structure of the electrode components and insulating film of a battery cell according to some embodiments of this application;

[0051] Figure 7 is a schematic diagram of the structure of the electrode components and insulating film of a battery cell in some other embodiments of this application;

[0052] Figure 8 is a schematic diagram of the insulating film structure of the battery cell shown in Figure 7;

[0053] Figure 9 is a schematic diagram of the structure of the electrode components and insulating film of a battery cell according to some embodiments of this application;

[0054] Figure 10 is a top view of the structure shown in Figure 9;

[0055] Figure 11 is a cross-sectional view of the electrode components and insulating film shown in Figure 9;

[0056] Figure 12 is a schematic diagram of the structure of the electrode components and insulating film of a battery cell according to some embodiments of this application;

[0057] Figure 13 is a top view of the structure shown in Figure 12;

[0058] Figure 14 is a cross-sectional view of the electrode components and insulating film shown in Figure 12;

[0059] Figure 15 is a schematic diagram of the structure of the insulating support of a battery cell according to some embodiments of this application;

[0060] Figure 16 is an assembly diagram of the insulating support and electrode components of a battery cell according to some embodiments of this application;

[0061] Figure 17 is another assembly diagram of the insulating support and electrode components of a battery cell according to some embodiments of this application;

[0062] Figure 18 is a schematic diagram of the structure of the insulating support of a battery cell according to some embodiments of this application;

[0063] Figure 19 is a cross-sectional view of the insulating support structure of the battery cell shown in Figure 18;

[0064] Figure 20 is an assembly diagram of the insulating support and electrode components of a battery cell according to some embodiments of this application;

[0065] Figure 21 is another assembly diagram of the insulating support and electrode components of a battery cell according to some embodiments of this application;

[0066] Figure 22 is an assembly diagram of the insulating support and housing components of the battery cell shown in Figure 18;

[0067] Figure 23 is a schematic diagram of the structure of a battery cell in some embodiments of this application before the electrode components are installed in the housing components and the insulating support is deformed.

[0068] Figure 24 is a schematic diagram of the structure of a battery cell according to some embodiments of this application after the electrode components are installed in the housing components and the insulating support is deformed.

[0069] Figure 25 is a partial structural diagram of the connection between the conductive part of the battery cell and the terminal component shown in Figure 24.

[0070] Figure 26 is a partial structural diagram of the connection between the terminal component and the housing component of the battery cell shown in Figure 24.

[0071] Figure 27 is a partial structural diagram of the conductive part of the battery cell shown in Figure 3 in a straightened state.

[0072] Figure 28 is a partial structural diagram of the connection between the conductive part of the battery cell and the terminal component shown in Figure 3.

[0073] Figure 29 is a partial structural diagram of the connection between the terminal component and the housing component of the battery cell shown in Figure 3.

[0074] Figure 30 is a structural cross-sectional view of a battery cell according to some other embodiments of this application;

[0075] Figure 31 is a partial enlarged view of the battery cell shown in Figure 30;

[0076] Figure 32 is a partial structural diagram of the conductive part of the battery cell shown in Figure 30 during the shaping process.

[0077] Figure 33 is an exploded view of the conductive part of the battery cell shown in Figure 30.

[0078] Figure 34 is a partial structural diagram of the conductive part of the battery cell shown in Figure 30 in a straightened state.

[0079] Figure 35 is a schematic diagram of the structure of the electrode components of the battery cell shown in Figure 30 being installed inside the housing component;

[0080] Figure 36 is a partial structural diagram of the battery cell connected to the terminal component shown in Figure 30.

[0081] Figure 37 is a partial structural diagram of the connection between the terminal component and the housing component of the battery cell shown in Figure 30.

[0082] Figure 38 is a schematic diagram of the structure of a battery cell according to some other embodiments of this application;

[0083] Figure 39 is a schematic diagram of the pole post component provided in some embodiments of this application;

[0084] Figure 40 is a top view of the pole post component shown in Figure 39;

[0085] Figure 41 is a view along direction B shown in Figure 40;

[0086] Figure 42 is a cross-sectional view along line CC in Figure 40;

[0087] Figure 43 is a partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0088] Figure 44 is a partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0089] Figure 45 is a partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0090] Figure 46 is a cross-sectional view of a battery cell provided in some embodiments of this application;

[0091] Figure 47 is a cross-sectional view of a battery cell provided in some embodiments of this application;

[0092] Figure 48 is a cross-sectional view of a battery cell provided in some embodiments of this application;

[0093] Figure 49 is a partial cross-sectional view of a battery cell provided in some embodiments of this application, in which the terminal component is in a state before being covered by the mounting wall;

[0094] Figure 50 is a diagram showing the pole post component shown in Figure 49 after it has been installed on the mounting wall.

[0095] Figure 51 is an exploded view of a portion of the battery cell provided in some embodiments of this application;

[0096] Figure 52 is a partial cross-sectional view of a battery cell provided in some embodiments of this application, in which the terminal component is in a state before being covered by the mounting wall;

[0097] Figure 53 shows the state of the pole post component shown in Figure 52 after it is covered by the mounting wall;

[0098] Figure 54 is a structural cross-sectional view of a battery cell according to some other embodiments of this application;

[0099] Figure 55 is a partial enlarged view of the battery cell shown in Figure 54;

[0100] Figure 56 is a structural cross-sectional view of a battery cell according to some other embodiments of this application;

[0101] Figure 57 is a partial enlarged view of the battery cell shown in Figure 56;

[0102] Figure 58 is a structural cross-sectional view of a battery cell according to some embodiments of this application;

[0103] Figure 59 is a partial enlarged view of the battery cell shown in Figure 58;

[0104] Figure 60 is a schematic diagram of the structure of a battery cell according to some other embodiments of this application;

[0105] Figure 61 is an exploded view of the structure of the battery cell shown in Figure 60;

[0106] Figure 62 is a cross-sectional view of the battery cell shown in Figure 60;

[0107] Figure 63 is a partial enlarged view of the battery cell shown in Figure 62;

[0108] Figure 64 is an exploded view of the processing of a battery cell according to an embodiment of this application;

[0109] Figure 65 is an exploded view of the processing of a battery cell according to an embodiment of this application;

[0110] Figure 66 is an exploded view of the processing of a battery cell according to an embodiment of this application;

[0111] Figure 67 is an exploded view of the processing of a battery cell according to an embodiment of this application;

[0112] Figure 68 is an exploded view of the processing of a battery cell according to an embodiment of this application.

[0113] The reference numerals in the detailed embodiments are as follows: Vehicle 1000; Battery 100; Controller 200; Motor 300; Housing 101; First housing section 1011; Second housing section 1012; Housing bottom plate 1013; Battery cell 102; First direction F1; Second direction F2; Third direction F3; Fourth direction F4; Fifth direction F5; Housing component 1; Housing body 11; Mounting wall 111; First recess 1111; Overlapping part 1112; Mounting hole 112; Opening 113; Peripheral wall 114; Housing cover 12; Receiving cavity 13; Sealing ring 14; Support plate 15; Terminal component 2; First receiving groove 201; Second receiving groove 202; Terminal body 21; Through hole 210; Inner end face 211; Peripheral part 212; Outer end face 213; Through part 214; Riveting part 2141; Inner limiting part 215; Outer limiting part 216; First pole post 21a; Second pole post 21b; Mating hole 21b1; Adapter structure 22; Inner end face 220 of adapter structure; Surrounding area 2201; Flange part 22a; Second countersunk groove 22b; First adapter ring 221; Second adapter ring 222; Stop ring part 2221; Third adapter ring 223; Inner extension part 2231; Outer extension part 2232; First insulating frame 224; Second insulating frame 225; Fourth adapter ring 227; Mating ring part 2271; Third insulating frame 228; Insulation structure 23; Sealing structure part 231; Shaft side part 231a; First insulating part 232; Second insulating part 234; Electrode component 3; Electrode assembly 31; Tab 311; Gathering portion 313; Active material coating portion 32; Conductive portion 33; Converging section 331; First extension section 332; First bending portion 3320; Second extension section 333; Second bending portion 3330; First connecting portion 3331; Second connecting portion 3332; Third connecting portion 3333; Opening groove 334; First opening groove 3341; Second opening groove 3342; Third opening groove 3343; Tab 335; Tab end 3351; Conductive element 336; Clamping portion 3360; Slot 3361; First connecting section 3362; Second connecting section 3363; First conductive section 3365; Second conductive section 3366; Third conductive section 3367. Pressure relief device 6; insulating film 7; first clearance hole 701; tearing structure 702; first tearing part 7021; second tearing part 7022; punching structure 703; main body insulating part 71; main body part 711; first insulating part 72; second insulating part 73; retaining piece 8; insulating bracket 9; second clearance hole 901; first hole wall 9011; second hole wall 9012; perforation 902; bracket body 91; first partition piece 92; second partition piece 93. Detailed Implementation

[0114] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0115] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0116] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0117] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0118] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0119] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0120] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0121] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0122] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0123] In related technologies, the tabs of battery cells are easily inserted upside down into the active material coating, which can easily cause short circuits in the battery cells. The reliability of the battery cells needs to be improved, which hinders the further improvement of battery reliability.

[0124] To improve the reliability of individual battery cells, this embodiment of the application places an insulating component between the conductive part that passes through the insulating component and connects to the electrode body and the active material coating part. This reduces the risk of failure of the active material coating part itself and the risk of leakage, thereby improving the reliability and stability of the individual battery cells. It also reduces the risk of short circuits in the individual battery cells, which is beneficial to improving the reliability of the individual battery cells in use.

[0125] The battery cells disclosed in this application can be used in electrical devices that use batteries as a power source or in various energy storage systems that use batteries as energy storage elements. Electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0126] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0127] Please refer to Figure 1, which is a structural schematic diagram of a vehicle 1000 according to some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. A battery 100 is disposed inside the vehicle 1000, and the battery 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery 100 can be used to power the vehicle 1000; for example, the battery 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300, for example, to meet the power requirements of the vehicle 1000 during startup, navigation, and driving.

[0128] In some embodiments of this application, the battery 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0129] Please refer to Figure 2, which is an exploded view of a battery 100 according to some embodiments of this application. The battery 100 includes a housing 101 and battery cells 102, with the battery cells 102 housed within the housing 101. The housing 101 provides a space for housing the battery cells 102, and the housing 101 can have various structures. In some embodiments, the housing 101 may include a first housing portion 1011 and a second housing portion 1012, which overlap each other, and together define a space for housing the battery cells 102. The second box portion 1012 can be a hollow structure with one end open, and the first box portion 1011 can be a plate-like structure. The first box portion 1011 covers the open side of the second box portion 1012, so that the first box portion 1011 and the second box portion 1012 together define the accommodating space. Alternatively, the first box portion 1011 and the second box portion 1012 can both be hollow structures with one side open, and the open side of the first box portion 1011 covers the open side of the second box portion 1012. Of course, the box 101 formed by the first box portion 1011 and the second box portion 1012 can be of various shapes, such as a cylinder, a cuboid, etc.

[0130] In battery 100, there can be multiple battery cells 102. These multiple battery cells 102 can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 102 are connected in both series and parallel. Multiple battery cells 102 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 102 is housed within housing 101. Alternatively, battery 100 can also be composed of multiple battery cells 102 first connected in series, parallel, or in a mixed manner to form battery modules, and then these modules are connected in series, parallel, or in a mixed manner to form a whole, which is also housed within housing 101. Battery 100 may also include other structures; for example, it may include a busbar component for electrical connection between multiple battery cells 102.

[0131] Each battery cell 102 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, a magnesium-ion battery, or a solid-state battery, but is not limited to these. The battery cell 102 can be cylindrical, flat, cuboid, or other shapes.

[0132] Please refer to Figures 3 and 4. Figure 3 is a schematic diagram of the structure of a battery cell 102 according to some embodiments of this application; Figure 4 is a cross-sectional view of the structure of a battery cell 102 according to some embodiments of this application. A battery cell 102 refers to the smallest unit constituting a battery 100. As shown in Figures 3 and 4, the battery cell 102 includes a housing component 1, a terminal component 2, an electrode component 3, an electrolyte, and other functional components. The housing component 1 includes a cover 12 and a body 11.

[0133] The cover 12 refers to a component that covers the opening 113 of the housing 11 to isolate the internal environment of the battery cell 102 from the external environment. The shape of the cover 12 can be adapted to the shape of the housing 11 to fit it. Optionally, the cover 12 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the cover 12 is less prone to deformation under pressure and impact, allowing the battery cell 102 to have higher structural strength and improved reliability. Functional components such as electrode post 2 can be provided on the cover 12. The electrode post 2 can be used to electrically connect with the electrode post 3 for outputting or inputting electrical energy into the battery cell 102. In some embodiments, the cover 12 can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of the battery cell 102 reaches a threshold. The material of the cover 12 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this. In some embodiments, an insulating element may be provided on the inner side of the cover 12. The insulating element can be used to isolate the electrical connection components inside the housing 11 from the cover 12 to reduce the risk of short circuit. For example, the insulating element may be made of plastic, rubber, etc.

[0134] The housing 11 is a component used to cooperate with the cover 12 to form the internal environment of the battery cell 102. This internal environment can accommodate the electrode components 3, electrolyte, and other components. The housing 11 and cover 12 can be independent components. An opening 113 can be provided on the housing 11, and the cover 12 can close the opening 113 to form the internal environment of the battery cell 102. Alternatively, the cover 12 and housing 11 can be integrated. Specifically, the cover 12 and housing 11 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 11, the cover 12 closes the housing 11. The housing 11 can have various shapes and sizes, such as cuboid, cylindrical, or hexagonal prism. Specifically, the shape of the housing 11 can be determined according to the specific shape and size of the electrode components 3. The shell 11 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application embodiment does not impose any special restrictions on this.

[0135] Electrode component 3 includes electrode assembly 31, which is the component in the battery cell 102 where electrochemical reactions occur. The casing 11 may contain one or more electrode assemblies 31. The electrode assembly 31 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly 31, while the portions of the positive and negative electrode sheets without active material each constitute tabs 335. The positive and negative tabs 335 may be located together at one end of the main body or separately at both ends of the main body. During the charging and discharging process of the battery 100, the positive and negative active materials react with the electrolyte, and the tabs 335 connect to the terminal component 2 to form a current loop. In solid-state batteries, the electrolyte may be a solid electrolyte layer located between the positive and negative electrode sheets, and the aforementioned separator may be omitted.

[0136] According to some embodiments of this application, referring to FIG4 and further referring to FIG5, FIG5 is a partial enlarged view of the battery cell 102 shown in FIG4. The housing component 1 defines a receiving cavity 13 and the housing component 1 includes a mounting wall 111. The terminal component 2 is mounted on the mounting wall 111 and the terminal component 2 includes a terminal body 21.

[0137] The mounting wall 111 is a part of the shell wall of the shell component 1, which can serve as the mounting carrier for the pole component 2. The mounting wall 111 can be a part of the shell body 11 of the shell, or it can be the shell cover 12 of the shell, or it can include a part of the shell body 11 and the shell cover 12.

[0138] Referring again to Figures 4 and 5, the battery cell 102 also includes an electrode component 3, which is housed in the receiving cavity 13. The electrode component 3 includes an active material coating portion 32, a conductive portion 33, and an insulating component. The conductive portion 33 connects the active material coating portion 32 and the electrode post body 21 for outputting or inputting electrical energy into the battery cell 102.

[0139] At least a portion of the insulating element is disposed between the end where the active material coating portion 32 connects to the conductive portion 33 and the pole body 21, that is, at least a portion of the insulating element is disposed between the active material coating portion 32 and the mounting wall 111.

[0140] As shown in Figures 3 and 4, the height direction of the active material coating part 32 is the first direction F1, the thickness direction of the active material coating part 32 is the second direction F2, and the width direction of the active material coating part 32 is the third direction F3. The active material coating part 32 has a first end and a second end that are disposed opposite to each other in its height direction.

[0141] If the conductive part 33 is provided at the first end of the active material coating part 32, then the wall of the housing component 1 opposite to the first end of the active material coating part 32 is the mounting wall 111, and the insulating member is at least partially provided between the first end of the active material coating part 32 and the electrode body 21; if the conductive part 33 is provided at the second end of the active material coating part 32, then the wall of the housing component 1 opposite to the second end of the active material coating part 32 is the mounting wall 111, and the insulating member is at least partially provided between the second end of the active material coating part 32 and the electrode body 21; if the conductive part 33 is provided at both the first and second ends of the active material coating part 32, then both the wall of the housing component 1 opposite to the first and second ends of the active material coating part 32 is the mounting wall 111, and the insulating member is at least partially provided between the first end of the active material coating part 32 and one of the electrode bodies 21, and at least another part of the insulating member is provided between the second end of the active material coating part 32 and the other electrode body 21.

[0142] The insulating component can be used to isolate the active material coating part 32 from the mounting wall 111 of the housing component 1, reducing the probability of contact between the active material coating part 32 and the mounting wall 111 of the housing component 1. This reduces the risk of corrosion of the mounting wall 111 of the housing component 1 due to leakage of the active material coating part 32, reduces the risk of failure of the active material coating part 32 itself, and reduces the risk of leakage, thereby improving the reliability and stability of the battery cell 102.

[0143] The insulating component has a clearance hole, through which the conductive part 33 can pass, allowing it to connect electrically with the electrode body 21 of the electrode component 2. The insulating component blocks the portion of the conductive part 33 that passes through the insulating component and connects with the electrode body 21 from the active material coating portion 32.

[0144] The phrase "the portion of the conductive part 33 passing through the insulating member and connecting to the terminal body 21" can refer to the portion where the conductive part 33 is directly connected to the terminal body 21, or it can refer to the portion where the conductive part 33 extends out of the insulating member and is indirectly connected to the terminal body 21. The insulating member can be used to isolate the portion of the conductive part 33 passing through the insulating member from the active material coating portion 32, reducing the probability that the conductive part 33 will be inserted backwards into the active material coating portion 32 due to redundancy, thereby reducing the risk of short circuit in the battery cell 102 and improving the reliability of the battery cell 102.

[0145] In the technical solution of this application embodiment, by setting an insulating component, an insulating effect can be achieved. On the one hand, it can isolate the active material coating part 32 from the mounting wall 111 of the housing component 1, reducing the probability of contact between the active material coating part 32 and the mounting wall 111 of the housing component 1. This reduces the risk of corrosion of the mounting wall 111 of the housing component 1 due to exposure of the active material coating part 32, reduces the risk of failure of the active material coating part 32 itself, and reduces the risk of leakage. This improves the reliability and stability of the battery cell 102. On the other hand, it can isolate the part of the conductive part 33 that passes through the insulating component from the active material coating part 32, reducing the probability of the conductive part 33 being inserted backwards into the active material coating part 32 due to redundancy. This reduces the risk of short circuit in the battery cell 102 and helps to improve the reliability of the battery cell 102.

[0146] In some embodiments, one end of the conductive portion 33 is directly connected to the active material coating portion 32, and the other end is directly connected to the electrode body 21. That is, the active material coating portion 32 is connected to the electrode body 21 through the conductive portion 33, thus forming electrical conductivity. This configuration simplifies the structure of the battery cell 102 and improves the production efficiency of the battery cell 102.

[0147] For example, the battery 100 includes a busbar component located outside the battery cell 102, and the terminal body 21 is connected to the busbar component to form electrical conduction, so that multiple battery cells 102 can be connected through the busbar component.

[0148] For example, when the electrode post 2 is the negative electrode, the electrode post body 21 can be a copper-aluminum composite component, wherein the copper-aluminum composite component can include an aluminum part and a copper part. The aluminum part is located on the side of the copper part away from the active material coating part 32, and can easily form a reliable connection with the aluminum busbar component. The copper part can easily connect with the copper foil tab 311 of the negative electrode. When the electrode post 2 is the positive electrode, the electrode post body 21 can be an aluminum component. The aluminum component can easily form a reliable connection with the aluminum busbar component, and the aluminum component can also easily connect with the aluminum foil tab 311 of the positive electrode.

[0149] The connection method between the conductive part 33 and the electrode component 2 is not limited, and may include, but is not limited to, ultrasonic welding, ultrasonic pre-welding combined with laser welding, resistance welding, pressure welding, brazing, bonding, etc.

[0150] Please refer to Figures 6 and 7. Figure 6 is a schematic diagram of the structure of the electrode component 3 and the insulating film 7 of the battery cell 102 in some embodiments of this application; Figure 7 is a schematic diagram of the structure of the electrode component 3 and the insulating film 7 of the battery cell 102 in other embodiments of this application. In the embodiments of this application, the insulating component includes the insulating film 7, which fully covers the active material coating portion 32. Here, "fully covered" means that the insulating film 7 covers all surfaces of the active material coating portion 32, so that the insulating film 7 can isolate the outer surface of the active material coating portion 32 from the shell component 1, reduce the risk of corrosion of the shell component 1 due to leakage of the active material coating portion 32, reduce the risk of failure of the active material coating portion 32 itself, and reduce the risk of leakage, thereby improving the reliability and stability of the battery cell 102.

[0151] The clearance hole includes a first clearance hole 701, which is opened at the position opposite to the insulating film 7 and the mounting wall 111. The size of the first clearance hole 701 is adapted to the thickness of the conductive part 33. The insulating film 7 forms the peripheral wall of the first clearance hole 701 to block the portion of the conductive part 33 that passes through the first clearance hole 701 and connects to the electrode body 21, and between the active material coating portion 32.

[0152] The phrase "the size of the first clearance hole 701 is adapted to the thickness of the conductive part 33" means that the size of the portion of the conductive part 33 located at the first clearance hole 701 is adapted to the thickness of the conductive part 33.

[0153] The size of the first clearance hole 701 itself cannot be too small, or the size of the first clearance hole 701 when in use (the size of the first clearance hole 701 when it opens under the pressure of the conductive part 33) cannot be too small, otherwise the conductive part 33 cannot be inserted smoothly and quickly; the size of the first clearance hole 701 itself cannot be too large, or the size of the first clearance hole 701 when in use (the size of the first clearance hole 701 when it opens under the pressure of the conductive part 33) cannot be too large, otherwise the risk of the active material coating part 32 being exposed will increase.

[0154] In the above technical solution, by adapting the size of the first clearance hole 701 to the thickness of the conductive part 33, on the one hand, the first clearance hole 701 allows the conductive part 33 to pass through the insulating film 7, enabling the conductive part 33 to be electrically connected to the electrode body 21 of the electrode component 2. On the other hand, while the conductive part 33 is inserted through the first clearance hole 701, the insulating film 7 can also cover the position of the multiple tabs 311 of the conductive part 33 near the root of the active material coating part 32, further providing insulation protection for the active material coating part 32 and reducing the thickness of the active material coating part 32. To mitigate the risk of leakage, insulation protection can be provided to the roots of the multiple tabs 311 of the conductive part 33 adjacent to the active material coating part 32. This separates the portion of the conductive part 33 passing through the first clearance hole 701 from the active material coating part 32 and the roots of the multiple tabs 311 of the conductive part 33 adjacent to the active material coating part 32. This reduces the probability that the conductive part 33 will be inserted backwards into the active material coating part 32 due to redundancy, and the roots of the multiple tabs 311 of the conductive part 33 adjacent to the active material coating part 32. As a result, the risk of short circuit in the battery cell 102 can be reduced.

[0155] Please refer to Figure 6 again. In some optional embodiments of this application, the first clearance hole 701 is a normally open hole adapted to the thickness of the conductive part 33. That is, when the insulating film 7 is in its natural state (the state in which the insulating film 7 is not squeezed by the conductive part 33), the size of the first clearance hole 701 is greater than zero.

[0156] In the above technical solution, by setting the first clearance hole 701 as a normally open hole, the conductive part 33 can quickly pass through the insulating film 7, which is beneficial to improve the efficiency of the insulating film 7 in wrapping the active material coating part 32, thereby improving the assembly efficiency of the battery cell 102. In addition, during the process of the conductive part 33 passing through the insulating film 7, it can avoid the insulating film 7, thereby reducing the probability of the conductive part 33 being deformed and reducing the number of operation steps for shaping the conductive part 33, thereby improving the assembly efficiency of the battery cell 102.

[0157] Please refer to Figure 7 again, and further refer to Figure 8. Figure 8 is a schematic diagram of the structure of the insulating film 7 of the battery cell 102 shown in Figure 7. In some other optional embodiments of this application, a tearing structure 702 is provided at the position opposite to the mounting wall 111. The tearing structure 702 is adapted to be torn by the conductive part 33 to form a first clearance hole 701 that matches the thickness of the conductive part 33.

[0158] Specifically, during the process of covering the outer side of the active material coating portion 32 with the insulating film 7, when the conductive portion 33 pushes open the tear structure 702 on the insulating film 7, an openable and closable first clearance hole 701 can be formed on the insulating film 7, so that the conductive portion 33 can smoothly pass through the first clearance hole 701. Since the first clearance hole 701 has a self-closing characteristic, after the conductive portion 33 is in place, the first clearance hole 701 can gradually close, so that the insulating film 7 can cover at least a portion of the multiple tabs 311 of the conductive portion 33 near the root of the active material coating portion 32.

[0159] Therefore, in the above technical solution, by pre-setting a tearing structure 702 on the insulating film 7, during the process of covering the outer side of the active material coating portion 32 with the insulating film 7, an openable and closable first clearance hole 701 can be formed. After the conductive portion 33 is inserted into place, the first clearance hole 701 can gradually close, so that the insulating film 7 can cover at least a portion of the multiple tabs 311 of the conductive portion 33 near the root of the active material coating portion 32. This can form insulation protection for the multiple tabs 311 of the conductive portion 33 near the root of the active material coating portion 32, so that the part of the conductive portion 33 passing through the first clearance hole 701 is separated from the multiple tabs 311 of the conductive portion 33 near the root of the active material coating portion 32. This reduces the probability that the conductive portion 33 will be inserted backwards into the active material coating portion 32 due to redundancy and the multiple tabs 311 of the conductive portion 33 near the root of the active material coating portion 32, thereby reducing the risk of short circuit in the battery cell 102.

[0160] Please refer to Figure 8 again. In the embodiment of this application, the tearing structure 702 includes a first tearing portion 7021 and a second tearing portion 7022. The first tearing portion 7021 extends along the length direction of the electrode body 21 (the third direction F3 shown in the figure, i.e., the width direction of the active material coating portion 32). The second tearing portion 7022 extends along a direction that forms an angle with the length direction of the electrode body 21. The end of the first tearing portion 7021 is connected to the second tearing portion 7022.

[0161] For example, the second tear-off portion 7022 can extend along the width direction of the electrode body 21 (as shown in the second direction F2, i.e., the thickness direction of the active material coating portion 32), so that the extension direction of the first tear-off portion 7021 is perpendicular to the extension direction of the second tear-off portion 7022. Alternatively, the second tear-off portion 7022 can be inclined relative to the length direction of the electrode body 21, so that the extension direction of the first tear-off portion 7021 and the extension direction of the second tear-off portion 7022 form an acute or obtuse angle.

[0162] Both the first tear portion 7021 and the second tear portion 7022 can be point-break structures. Specifically, each of the first tear portion 7021 and the second tear portion 7022 includes multiple connecting portions and multiple disconnecting portions. The multiple connecting portions and multiple disconnecting portions can be arranged in the respective extending directions of the first tear portion 7021 and the second tear portion 7022. When the conductive portion 33 pushes open the tear structure 702 on the insulating film 7, the multiple connecting portions of the first tear portion 7021 and the multiple connecting portions of the second tear portion 7022 are disconnected, thereby forming an openable and closable first clearance hole 701 at the tear structure 702 of the insulating film 7.

[0163] Of course, both the first tearing part 7021 and the second tearing part 7022 can be a thickness reduction structure. The thickness reduction structure can be torn open under the pressure of the conductive part 33, thereby forming an openable first clearance hole 701; or, one of the first tearing part 7021 and the second tearing part 7022 is a point-break structure, and the other is a thickness reduction structure.

[0164] In the above technical solution, by setting the tearing structure 702 to include a first tearing part 7021 and a second tearing part 7022 set at an angle, the first clearance hole 701 formed can be opened and closed. The insulating film 7 can adjust the opening of the first clearance hole 701 according to the shape of the root of the conductive part 33 adjacent to the active material coating part 32, so that the conductive part 33 can be smoothly inserted into the first clearance hole 701. It can also reduce the risk of the insulating film 7 being severely torn, further improve the insulation protection performance of the insulating film 7 to the active material coating part 32, further reduce the probability of the conductive part 33 being inserted into the active material coating part 32 due to redundancy, and thus further reduce the risk of short circuit of the battery cell 102.

[0165] Referring again to Figure 8, in the embodiment of this application, the end of the first tear-off portion 7021 is connected to the middle of the second tear-off portion 7022, that is, the end of the first tear-off portion 7021 in the extending direction is connected to the middle of the second tear-off portion 7022 in its extending direction. This allows the insulating film 7 to form at least two openable insulating sheets at the tear structure 702, so that during the process of the conductive portion 33 passing through the first clearance hole 701, the two insulating sheets can be located on at least two opposite sides of the conductive portion 33 to cover at least two opposite sides of the roots of the multiple tabs 311 of the conductive portion 33 adjacent to the active material coating portion 32. This separates the portion of the conductive portion 33 passing through the first clearance hole 701 from at least two opposite sides of the roots of the multiple tabs 311 of the conductive portion 33 adjacent to the active material coating portion 32, reducing the probability that the conductive portion 33 will be inserted backwards into the active material coating portion 32 due to redundancy and the multiple tabs 311 of the conductive portion 33 adjacent to the roots of the active material coating portion 32, thereby reducing the risk of short circuit in the battery cell 102.

[0166] Please refer to Figures 9-11. Figure 9 is a schematic diagram of the structure of the electrode component 3 and the insulating film 7 of the battery cell 102 in some embodiments of this application; Figure 10 is a top view of the structure shown in Figure 9; and Figure 11 is a cross-sectional view of the structure of the electrode component 3 and the insulating film 7 shown in Figure 9. In the embodiments of this application, there are two second tear-off portions 7022, which are spaced apart and connected to both ends of the first tear-off portion 7021 respectively. This increases the adjustable opening of the first clearance hole 701, allowing the conductive part 33 to pass through the first clearance hole 701 more smoothly. It also further reduces the risk of the insulating film 7 being severely torn, thereby further reducing the risk of short circuit in the battery cell 102.

[0167] In the embodiments of this application, the second tear-off portion 7022 extends along the width direction of the electrode body 21, and the extension direction of the second tear-off portion 7022 is perpendicular to the extension direction of the first tear-off portion 7021. This allows the insulating film 7 to form two openable insulating sheets at the tear structure 702. Without affecting the effect of the conductive portion 33 passing through the insulating film 7, the structural integrity of the insulating film 7 at the first clearance hole 701 can be improved, thereby improving the insulation and protection performance of the insulating film 7. Furthermore, it can reduce the probability that the conductive portion 33 will be inserted into the active material coating portion 32 due to redundancy, thereby reducing the risk of short circuit in the battery cell 102.

[0168] In some specific embodiments, the tearing structure 702 includes a first tearing portion 7021 and two second tearing portions 7022. The first tearing portion 7021 extends along the length direction of the pole body 21, and the two second tearing portions 7022 are spaced apart along the length direction of the pole body 21. Each second tearing portion 7022 extends along the width direction of the pole body 21, and the two ends of the extension direction of the first tearing portion 7021 are respectively connected to the middle of the extension direction of the two second tearing portions 7022.

[0169] Therefore, in the above technical solution, connecting the end of the first tear-off portion 7021 to the middle of the second tear-off portion 7022 allows the insulating film 7 to form at least two openable insulating sheets at the tear structure 702. These two insulating sheets can cover at least two opposite sides of the multiple tabs 311 of the conductive portion 33 near the root of the active material coating portion 32, reducing the probability of the conductive portion 33 being redundantly inserted into the interior of the active material coating portion 32 and the multiple tabs 311 of the conductive portion 33 near the root of the active material coating portion 32, thereby reducing the risk of a short circuit in the battery cell 102; the number of second tear-off portions 7022... Setting two holes increases the adjustable opening of the first clearance hole 701, further reducing the risk of the insulating film 7 being severely torn, thereby further reducing the risk of short circuit in the battery cell 102. Extending the second tearing part 7022 along the width direction of the electrode body 21 can improve the structural integrity of the insulating film 7 at the first clearance hole 701 without affecting the effect of the conductive part 33 passing through the insulating film 7, thereby improving the insulation protection performance of the insulating film 7. This can further reduce the probability that the conductive part 33 will be inserted into the active material coating part 32 due to redundancy, thereby reducing the risk of short circuit in the battery cell 102.

[0170] Referring again to Figure 8, in some specific embodiments, the insulating film 7 includes a main insulating portion 71, a first insulating portion 72, and a second insulating portion 73. The main insulating portion 71 wraps around the periphery of the active material coating portion 32. The first insulating portion 72 and the second insulating portion 73 are respectively disposed at both ends of the main insulating portion 71. The first insulating portion 72 is located on the side of the main insulating portion 71 near the mounting wall 111, and the first insulating portion 72 wraps around the end of the active material coating portion 32 near the mounting wall 111. The second insulating portion 73 is located on the side of the main insulating portion 71 away from the mounting wall 111, and the second insulating portion 73 wraps around the end of the active material coating portion 32 away from the mounting wall 111. A first clearance hole 701 is formed in the first insulating portion 72.

[0171] The cross-section of the active material coating portion 32 can be circular, rectangular, or polygonal. When the cross-section of the active material coating portion 32 is circular, the main insulating portion 71 can be rolled into a shape that matches the shape of the periphery (cylindrical surface) of the active material coating portion 32 to wrap around the periphery of the active material coating portion 32; that is, the cross-sectional shape of the main insulating portion 71 is annular. When the cross-section of the active material coating portion 32 is rectangular, the main insulating portion 71 can be folded into a shape that matches the shape of the periphery (four side walls) of the active material coating portion 32 to wrap around the periphery of the active material coating portion 32; that is, the cross-sectional shape of the main insulating portion 71 is rectangular. When the cross-section of the active material coating portion 32 is polygonal, the main insulating portion 71 can be folded into a shape that matches the shape of the periphery (multiple side walls) of the active material coating portion 32 to wrap around the periphery of the active material coating portion 32; that is, the cross-sectional shape of the main insulating portion 71 is polygonal.

[0172] With the battery cell 102 placed vertically, the first insulating part 72 covers one end of the active material coating part 32, and the conductive part 33 extends out from the first insulating part 72. The main insulating part 71 wraps around the periphery of the active material coating part 32, and the second insulating part 73 covers the other end of the active material coating part 32.

[0173] Therefore, in the above technical solution, the insulating film 7 is composed of multiple parts, which can completely separate the active material coating part 32 from the housing component 1, so as to fully reduce the exposure of the active material coating part 32, reduce the risk of electrode component 3 failure and damage, reduce the risk of housing component 1 being corroded, and improve the reliability and stability of battery cell 102.

[0174] Please refer to Figure 8 again. The main insulating part 71 includes multiple main parts 711, which are connected end to end in a ring shape. The multiple main parts 711 together wrap around the periphery of the active material coating part 32. The first insulating part 72 and the second insulating part 73 are located at the two ends of the ring structure formed by the multiple main parts 711, respectively.

[0175] Specifically, the number of main body portions 711 can be two, three, or more, depending on the shape of the active material coating portion 32. For example, the number of main body portions 711 can correspond one-to-one with the number of peripheral surfaces of the active material coating portion 32, meaning that multiple main body portions 711 cover multiple peripheral surfaces of the active material coating portion. Alternatively, the number of main body portions 711 can be less than the number of peripheral surfaces of the active material coating portion 32, meaning that when the insulating film 7 is in the unfolded state, the surface area of ​​at least one main body portion 711 is larger than the surface area of ​​one peripheral surface of the active material coating portion 32, thus allowing the main body portion 711 to cover two or more peripheral surfaces of the active material coating portion 32. Yet another example is that the number of main body portions 711 can be greater than the number of peripheral surfaces of the active material coating portion 32, allowing at least a portion of the multiple main body portions 711 to overlap.

[0176] Please refer to Figures 9-11 again. In the embodiments of this application, the insulating film 7 is provided with a retaining piece 8 around at least a portion of the circumferential region of the first clearance hole. The hardness of the retaining piece 8 is greater than that of the insulating film 7.

[0177] For example, the retaining sheet 8 and the insulating film 7 can be made of the same material, and the thickness of the retaining sheet 8 is greater than the thickness of the insulating film 7; or, for example, the retaining sheet 8 and the insulating film 7 can be made of different insulating materials.

[0178] The number of retaining pieces 8 can be one and the retaining piece 8 is located on one side of the first clearance hole 701. Of course, the number of retaining pieces 8 can also be multiple, and multiple retaining pieces 8 are arranged circumferentially in the first clearance hole 701.

[0179] Please refer to Figure 9. There are two retaining pieces 8. Each retaining piece 8 extends along the length of the active material coating portion 32. The two retaining pieces 8 are arranged in the thickness direction of the active material coating portion 32, that is, the two retaining pieces 8 are arranged in the width direction of the pole body 21. The position between two adjacent retaining pieces 8 is opposite to the first clearance hole 701 of the insulating film 7 so that the conductive portion 33 can pass through.

[0180] In the above technical solution, by connecting and setting the retaining piece 8 on the insulating film 7, the rigidity of the insulating film 7 at the first clearance hole 701 can be increased. On the one hand, it can enhance the barrier effect between the part of the conductive part 33 passing through the first clearance hole 701 and the active material coating part 32, further reducing the probability of the conductive part 33 being inserted into the active material coating part 32. On the other hand, it can keep the roots of the multiple tabs 311 of the conductive part 33 near the active material coating part 32 in a closed shape, further reducing the probability of the part of the conductive part 33 passing through the first clearance hole 701 being inserted into the roots of the multiple tabs 311 of the conductive part 33 near the active material coating part 32. Thus, the risk of short circuit of the battery cell 102 can be greatly reduced.

[0181] Please refer again to Figures 6 and 9-11. In the embodiment where the first clearance hole 701 is a normally open hole adapted to the thickness of the conductive part 33, the retaining piece 8 can cover at least part of the outer side of the insulating film 7 and be connected to the insulating film 7. Alternatively, one edge of the retaining piece 8 can be connected to the hole edge of the first clearance hole 701 and the other side can extend in a direction close to the center of the first clearance hole 701.

[0182] Please refer again to Figure 7, and further to Figures 12-14. Figure 12 is a schematic diagram of the structure of the electrode component 3 and the insulating film 7 of the battery cell 102 in some embodiments of this application; Figure 13 is a top view of the structure shown in Figure 12; and Figure 14 is a cross-sectional view of the structure of the electrode component 3 and the insulating film 7 shown in Figure 12. In the embodiment where the first clearance hole 701 is formed by the tearing structure 702 being torn by the conductive part 33, the retaining piece 8 can cover the area on the insulating film 7 where the tearing structure 702 is located and is connected to the insulating film 7.

[0183] In the embodiments of this application, a pressure relief device 6 is provided on the mounting wall 111. A puncture structure 703 can be provided at the position opposite to the pressure relief device 6 on the insulating film 7. The puncture structure 703 and the tearing structure 702 can be in the same form. When the pressure relief device 6 is opened, the puncture structure 703 can be opened more smoothly, which is conducive to venting.

[0184] One pole post component 2 can be installed on the mounting wall 111, and the pressure relief device 6 and the pole post component 2 can be arranged at intervals along the length of the mounting wall 111. Two pole post components 2 can also be installed on the mounting wall 111, and the two pole post components 2 and the pressure relief device 6 can be arranged at intervals along the length of the mounting wall 111, with the pressure relief device 6 located between the two pole post components 2.

[0185] Please refer to Figures 4 and 5 again. In the embodiments of this application, the clearance hole includes a second clearance hole 901, which is disposed opposite to the first clearance hole 701. The insulating component also includes an insulating support 9, which includes a support body 91. The support body 91 is disposed at one end of the active material coating portion 32 near the mounting wall 111, and the support body 91 covers at least a portion of the insulating film 7 on the end of the active material coating portion 32 facing the mounting wall 111.

[0186] The second clearance hole 901 is formed in the bracket body 91, and the conductive part 33 passes through the first clearance hole 701. The conductive part 33 is either inside the second clearance hole 901 or passes through the second clearance hole 901, so that the conductive part 33 can be connected to the pole body 21. That is, the part of the conductive part 33 connected to the pole body 21 can be located inside the second clearance hole 901 or outside the second clearance hole 901.

[0187] In the above technical solution, the support body 91 can support the active material coating part 32 and isolate the active material coating part 32 from the mounting wall 111 of the housing component 1, reducing the probability of contact between the active material coating part 32 and the mounting wall 111. This reduces the risk of corrosion of the mounting wall 111 of the housing component 1 due to leakage of the active material coating part 32, reduces the risk of leakage, and thus improves the reliability and stability of the battery cell 102.

[0188] Please refer to Figures 15-17. Figure 15 is a structural schematic diagram of the insulating support 9 of the battery cell 102 in some embodiments of this application; Figure 16 is an assembly diagram of the insulating support 9 of the battery cell 102 and the electrode component 3 in some embodiments of this application; Figure 17 is another assembly diagram of the insulating support 9 of the battery cell 102 and the electrode component 3 in some embodiments of this application. In the embodiments of this application, the second clearance hole 901 has a first hole wall 9011 and a second hole wall 9012, which are disposed opposite to each other in the width direction of the electrode body 21 (the second direction F2 shown in the figure, i.e., the thickness direction of the active material coating portion 32).

[0189] The insulating support 9 also includes a first partition 92, which is disposed at the first hole wall 9011 and connected to the support body 91. The first partition 92 extends toward the center of the second clearance hole 901 and blocks the part where the conductive part 33 is connected to the electrode body 21 and the active material coating part 32.

[0190] For ease of understanding, the first separator 92 can be defined as having a first side edge and a second side edge disposed opposite to each other in the second direction F2. The second side edge of the first separator 92 is disposed closer to the center of the second clearance hole 901 than the first side edge. The first side edge of the first separator 92 is connected to the first hole wall 9011 of the second clearance hole 901. The conductive part 33 passes through at least part of the first clearance hole 701. The conductive part 33 passes through the second clearance hole 901 or at the second clearance hole 901 and is connected to the pole body 21.

[0191] In the above technical solution, by setting a first partition 92 at the second clearance hole 901, the first partition 92 can block the part of the conductive part 33 extending out of the first clearance hole 701 from the active material coating part 32, reducing the probability that the conductive part 33 will be inserted into the active material coating part 32 due to redundancy, thereby reducing the risk of short circuit in the battery cell 102 and improving the reliability of the battery cell 102.

[0192] Please refer to Figures 16 and 17 again. In the embodiments of this application, the first separator 92 abuts against the root of the conductive portion 33 adjacent to the active material coating portion 32. The first separator 92 extends horizontally from the first hole wall 9011 to the second hole wall 9012, or the first separator 92 extends obliquely in the direction close to the active material coating portion 32.

[0193] Since the multiple tabs 311 of the conductive part 33 are close together near the root of the active material coating part 32 to form a structure with a certain angle, by setting the first separator 92 in the above structure, after the conductive part 33 is inserted into place, the first separator 92 and the root of the conductive part 33 near the active material coating part 32 press against each other, so that the root of the conductive part 33 near the active material coating part 32 is more tightly closed, so that the conductive part 33 can maintain the preset gathered shape and cannot be dispersed, thereby further reducing the probability that the conductive part 33 is partially inserted into the root of the multiple tabs 311 of the conductive part 33 near the active material coating part 32 through the first clearance hole 701.

[0194] Furthermore, this arrangement can reduce the space occupied by the first separator 92 in the second clearance hole 901 away from the active material coating part 32, and reserve more space for the part of the conductive part 33 away from the active material coating part 32, or even the electrode component 2. This is beneficial to reduce the size of the conductive part 33 in the thickness direction of the mounting wall 111, thereby reducing the size of the battery cell 102 in the thickness direction of the mounting wall 111.

[0195] In the embodiments of this application, the thickness of the first partition 92 is less than the thickness of the bracket body 91, which can reduce the space occupied by the first partition 92 in the second clearance hole 901, thereby reserving more space for the conductive part 33, or even the electrode component 2, which is conducive to improving the energy density of the electrode component 3.

[0196] For example, the side of the first separator 92 near the active material coating part 32 can be further away from the active material coating part 32 than the side of the support body 91 near the active material coating part 32. This can reduce the space occupied by the first separator 92 in the internal space of the second clearance hole 901 near the active material coating part 32, and reserve space for the placement of the conductive part 33 near the root of the active material coating part 32.

[0197] For example, the side of the first separator 92 away from the active material coating part 32 can be closer to the active material coating part 32 than the side of the support body 91 away from the active material coating part 32. This can reduce the space occupied by the first separator 92 in the second clearance hole 901 away from the active material coating part 32, and reserve more space for the part of the conductive part 33 away from the active material coating part 32, or even the pole piece 2.

[0198] Please refer to Figure 15 again. The dimension of the first separator 92 in the length direction of the electrode body 21 is smaller than the dimension of the second clearance hole 901 in the length direction of the electrode body 21. The first separator 92 is separated from the hole wall of the second clearance hole 901 on both sides of the length direction of the electrode body 21 (the third direction F3 shown in Figure 15, i.e. the width direction of the active material coating part 32) so that the first separator 92 can be deformed under the pressure of the conductive part 33.

[0199] Therefore, in the above technical solution, by limiting the first separator 92 to meet the above conditions, the first separator 92 can be deformed under the action of external force (e.g., the pressing action of the conductive part 33). In this way, the first separator 92 can be deformed according to the root of the conductive part 33 adjacent to the active material coating part 32, and press against the root of the conductive part 33 adjacent to the active material coating part 32, so that the roots of the conductive part 33 adjacent to the active material coating part 32 are more tightly closed, thereby allowing the conductive part 33 to maintain the preset gathered shape and not disperse.

[0200] The first separator 92 can be made of a softer material so that it can be deformed under the action of the conductive part 33, so that the shape of the first separator 92 can be made to conform to the root of the active material coating part 32 adjacent to the conductive part 33.

[0201] In the embodiments of this application, the size of the first separator 92 is greater than or equal to the size of the conductive part 33 in the length direction of the pole body 21 (the third direction F3 as shown in the figure).

[0202] In the above technical solution, by controlling the size of the first separator 92 in the length direction of the electrode body 21 to meet the above conditions, the first separator 92 can extend beyond the conductive part 33 in the length direction of the electrode body 21 on both sides. In this way, the first separator 92 can completely separate the part of the conductive part 33 away from the active material coating part 32 from the active material coating part 32. This can greatly reduce the probability that the conductive part 33 will be inserted into the active material coating part 32 due to redundancy, further reducing the risk of short circuit in the battery cell 102. It can also reduce the local deformation problem caused by the first separator 92 pressing against a part of the conductive part 33 in the length direction of the electrode body 21, thereby reducing the risk of failure and damage of the conductive part 33 and further improving the reliability and stability of the battery cell 102.

[0203] Please refer to Figures 18-21. Figure 18 is a schematic diagram of the structure of the insulating support 9 of the battery cell 102 in some embodiments of this application; Figure 19 is a cross-sectional view of the structure of the insulating support 9 of the battery cell 102 shown in Figure 18; Figure 20 is an assembly diagram of the insulating support 9 of the battery cell 102 and the electrode component 3 in some embodiments of this application; Figure 21 is another assembly diagram of the insulating support 9 of the battery cell 102 and the electrode component 3 in some embodiments of this application. In the embodiments of this application, the insulating support 9 further includes a second partition 93, which is disposed at the second hole wall 9012 and connected to the support body 91. The second partition 93 extends toward the center of the second clearance hole 901.

[0204] The second separator 93 is spaced apart from the first separator 92. A perforation 902 is formed between the second separator 93 and the first separator 92. The perforation 902 communicates with the second clearance hole 901. The conductive part 33 passes through the perforation 902. The first separator 92 and the second separator 93 are separated on both sides of the part where the conductive part 33 passes through the perforation 902 and connects to the electrode body 21, and between the conductive part 33 and the active material coating part 32.

[0205] In the above technical solution, by setting the insulating support 9 to include a first separator 92 and a second separator 93, the first separator 92 and the second separator 93 can block the part of the conductive part 33 extending out of the perforation 902 from the active material coating part 32, further reducing the probability that the conductive part 33 will be inserted into the active material coating part 32 due to redundancy, thereby reducing the risk of short circuit in the battery cell 102 and improving the reliability of the battery cell 102.

[0206] The second separator 93 abuts against the root of the conductive part 33 adjacent to the active material coating part 32. The second separator 93 extends horizontally from the second hole wall 9012 to the first hole wall 9011, or the second separator 93 extends obliquely toward the active material coating part 32.

[0207] Since the multiple tabs 311 of the conductive part 33 are close together near the root of the active material coating part 32 to form a structure with a certain angle, by setting the second separator 93 in the above structure, after the conductive part 33 is inserted into place, the second separator 93 and the root of the conductive part 33 near the active material coating part 32 press against each other, so that the root of the conductive part 33 near the active material coating part 32 is more tightly closed, so that the conductive part 33 can maintain the preset gathered shape and cannot be dispersed, thereby further reducing the probability that the conductive part 33 passes through the through hole 902 and is inserted into the root of the multiple tabs 311 of the conductive part 33 near the active material coating part 32.

[0208] Furthermore, this arrangement can reduce the space occupied by the second separator 93 in the second clearance hole 901 away from the active material coating part 32, and reserve more space for the part of the conductive part 33 away from the active material coating part 32, or even the electrode component 2. This is beneficial to reduce the size of the conductive part 33 in the thickness direction of the mounting wall 111, thereby reducing the size of the battery cell 102 in the thickness direction of the mounting wall 111.

[0209] In the embodiments of this application, the dimension of the perforation 902 in the width direction of the pole body 21 is greater than or equal to the thickness of the conductive portion 33.

[0210] In the above technical solution, by limiting the size of the perforation 902 in the width direction of the electrode body 21 to meet the above conditions, the conductive part 33 can pass smoothly through the perforation 902, reducing the scratching of the conductive part 33 by the first separator 92 and the second separator 93, thereby reducing the risk of failure and damage of the conductive part 33 and improving the reliability and stability of the battery cell 102.

[0211] The position of the perforation 902 between the first separator 92 and the second separator 93 can be aligned with the closing position of the multiple tabs 311 of the conductive part 33 adjacent to the active material coating part 32. The position of the perforation 902 between the first separator 92 and the second separator 93 can be adjusted according to the closing position of the multiple tabs 311 of the conductive part 33 adjacent to the active material coating part 32.

[0212] For example, if the convergence position of the plurality of tabs 311 of the conductive part 33 adjacent to the active material coating part 32 is aligned with the center of the active material coating part 32 in the width direction, then the perforation 902 formed between the first separator 92 and the second separator 93 can be aligned with the center of the active material coating part 32 in the width direction.

[0213] For example, if the convergence position of the plurality of tabs 311 of the conductive part 33 adjacent to the active material coating part 32 is eccentrically positioned relative to the center of the active material coating part 32 in the width direction, then the perforation 902 formed between the first separator 92 and the second separator 93 can be eccentrically positioned relative to the center of the active material coating part 32 in the width direction.

[0214] Please refer to Figure 18 again. In the embodiment of this application, the size of the second separator 93 is greater than or equal to the size of the conductive part 33 in the length direction of the pole body 21.

[0215] In the above technical solution, by controlling the size of the second separator 93 in the length direction of the electrode body 21 to meet the above conditions, the second separator 93 can extend beyond the conductive part 33 in the length direction of the electrode body 21 on both sides. This can reduce the local deformation problem caused by the second separator 93 pressing against a part of the conductive part 33 in the length direction of the electrode body 21, thereby reducing the risk of failure and damage of the conductive part 33 and further improving the reliability and stability of the battery cell 102.

[0216] Please refer to Figure 20 again. In the embodiment of this application, in the width direction of the pole body 21, the size of the overlapping area between the second separator 93 and the root of the conductive part 33 adjacent to the active material coating part 32 is less than half the size of the root of the conductive part 33 adjacent to the active material coating part 32.

[0217] Here, "overlapping area" refers to the portion in a plane perpendicular to the height direction of the active material coating portion 32 where the projection of the second separator 93 on the plane overlaps with the projection of the root of the conductive portion 33 adjacent to the active material coating portion 32 on the plane. Specifically, the dimension of the overlapping area between the second separator 93 and the root of the conductive portion 33 adjacent to the active material coating portion 32 in the width direction of the electrode body 21 is L3, and the dimension of the root of the conductive portion 33 adjacent to the active material coating portion 32 in the width direction of the electrode body 21 is L4. L3 is less than half of L4; for example, L3 can be 0.2, 0.3, or 0.4 times L4.

[0218] In the above technical solution, by limiting the size of the overlapping area between the second separator 93 and the root of the active material coating 32 adjacent to the conductive part 33 to meet the above range, the root of the active material coating 32 adjacent to the conductive part 33 can maintain a preset shape, thereby making the bending shape of the conductive part 33 controllable.

[0219] The thickness of the second separator 93 is less than the thickness of the support body 91. This reduces the space occupied by the second separator 93 within the second clearance hole 901, thereby providing more space for the conductive part 33 and even the electrode post 2, which is beneficial for improving the energy density of the electrode post 3. The second separator 93 is separated from the hole wall of the second clearance hole 901 on both sides of the length direction of the electrode post body 21 (the third direction F3 as shown in the figure, i.e., the width direction of the active material coating part 32), so that the second separator 93 can be deformed under the pressure of the conductive part 33.

[0220] The assembly process of the battery cell 102 according to an embodiment of this application is described below. Please refer to FIG22, which is an assembly diagram of the insulating support 9 and the housing component 1 of the battery cell 102 shown in FIG18. In the embodiment where the mounting wall 111 is a wall opposite to the housing body 11 and the housing cover 12, the insulating support 9 can be pre-installed in the housing body 11, and the insulating support 9 abuts against the inner surface of the mounting wall 111. Before the electrode assembly 31 covered with the insulating film 7 is installed into the housing component 1, the first partition 92 and the second partition 93 of the insulating support 9 are inclined relative to the thickness direction of the mounting wall 111. Please refer to Figures 23 and 24. Figure 23 is a schematic diagram of the structure of the electrode component 3 of the battery cell 102 in some embodiments of this application before it is installed into the housing component 1 and the insulating support 9 is deformed. Figure 24 is a schematic diagram of the structure of the electrode component 3 of the battery cell 102 in some embodiments of this application after it is installed into the housing component 1 and the insulating support 9 is deformed. During the process of installing the electrode assembly 31 covered with the insulating film 7 into the housing component 1, the conductive part 33 can pass through the perforation 902 between the first separator 92 and the second separator 93. When the active material coating part 32 abuts against the support body 91, it can also push the first separator 92 and the second separator 93 to deform away from the active material coating part 32, thereby forming the structure shown in Figure 24. Please refer to Figures 25 and 26. Figure 25 is a partial structural diagram of the battery cell 102 shown in Figure 24 when the conductive part 33 is connected to the terminal component 2. Figure 26 is a partial structural diagram of the battery cell 102 shown in Figure 24 when the terminal component 2 is connected to the housing component 1. After the active material coating part 32 is installed into the housing component 1, the conductive part 33 extends out from the through hole 902. Then the conductive part 33 is connected to the terminal component 2. The terminal component 2 is flipped over so that it covers the mounting hole 112 on the mounting wall 111. Finally, the terminal component 2 is connected to the mounting wall 111, thereby realizing the assembly of the battery cell 102.

[0221] In the embodiments of this application, the battery cell 102 includes an insulating film 7, which covers the active material coating portion 32. The insulating film 7 has a through hole on one end facing the mounting wall 111, so that the conductive portion 33 can be exposed.

[0222] The through hole here can be an open end of the insulating film 7, or it can be a through hole with a size greater than or equal to the projected size of the root of the active material coating part 32 adjacent to the conductive part 33, so as to avoid the root of the active material coating part 32 adjacent to the conductive part 33, so that the root of the active material coating part 32 adjacent to the conductive part 33 is fully exposed.

[0223] The insulating film 7 can isolate the outer surface of the active material coating part 32 from the housing component 1, reduce the risk of corrosion of the housing component 1 due to the active material coating part 32 being exposed, reduce the risk of failure of the active material coating part 32 itself, and reduce the risk of leakage, thereby improving the reliability and stability of the battery cell 102.

[0224] Furthermore, the insulating element is an insulating support 9, which is disposed at one end of the active material coating portion 32 near the mounting wall 111. The insulating support 9 covers at least a portion of the insulating film 7 on the end of the active material coating portion 32 facing the mounting wall 111. A clearance hole is opened in the insulating support 9, and the conductive portion 33 passes through the through hole and the clearance hole to connect with the pole body 21.

[0225] The insulating bracket 9 can support the active material coating part 32, isolate the active material coating part 32 from the mounting wall 111 of the housing component 1, reduce the probability of contact between the active material coating part 32 and the mounting wall 111, thereby reducing the risk of corrosion of the mounting wall 111 of the housing component 1 due to the active material coating part 32 being exposed, reducing the risk of leakage, and thus improving the reliability and stability of the battery cell 102.

[0226] In the embodiments of this application, the insulating bracket 9 is positioned on both sides of the portion of the conductive part 33 that passes through the clearance hole and connects to the electrode body 21, and between it and the active material coating part 32.

[0227] Specifically, the insulating support 9 includes a support body 91, a first partition 92, and a second partition 93. The support body 91 is disposed at one end of the active material coating portion 32 near the mounting wall 111, and the support body 91 covers at least a portion of the insulating film 7 on the end of the active material coating portion 32 facing the mounting wall 111. A clearance hole is formed in the support body 91, and the clearance hole has a first hole wall 9011 and a second hole wall 9012. The first hole wall 9011 and the second hole wall 9012 are arranged opposite to each other in the width direction of the pole body 21. The first partition 92 is disposed on the first hole wall 9011. The first partition 92 is connected to the support body 91, and the second partition 93 is located at the second hole wall 9012 and is connected to the support body 91. The first partition 92 and the second partition 93 extend toward each other. A through hole 902 is formed between the second partition 93 and the first partition 92. The through hole 902 communicates with the clearance hole. The conductive part 33 passes through the through hole 902. The first partition 92 and the second partition 93 are blocked on both sides of the part of the conductive part 33 that passes through the clearance hole and connects to the electrode body 21, and between the conductive part 33 and the active material coating part 32.

[0228] Therefore, in the above technical solution, the insulating bracket 9 blocks the conductive part 33 from passing through the avoidance hole on both sides and between the conductive part 33 and the active material coating part 32, which can further reduce the probability that the conductive part 33 will be inserted into the active material coating part 32 due to redundancy, thereby reducing the risk of short circuit in the battery cell 102 and improving the reliability of the battery cell 102.

[0229] Please refer to Figure 5 again. In the embodiment of this application, the conductive part 33 includes a converging section 331, a first extension section 332, and a second extension section 333. The converging section 331, the first extension section 332, and the second extension section 333 are arranged in the extension direction of the conductive part 33. The converging section 331 is connected to the active material coating part 32, and the second extension section 333 is connected to the electrode body 21. The two ends of the first extension section 332 are respectively connected to the converging section 331 and the second extension section 333.

[0230] In one embodiment where the insulating member includes an insulating film 7, the insulating film 7 is provided with a first clearance hole 701, the first extension 332 passes through the first clearance hole 701 and extends out of the first clearance hole 701, and in another embodiment where the insulating member includes an insulating support 9, the insulating support 9 has a second clearance hole 901, the first extension 332 passes through the second clearance hole 901.

[0231] The converging section 331 and the second extension section 333 are located on both sides of the insulating member. The insulating member can separate the converging section 331 and the second extension section 333, thereby reducing the probability that the second extension section 333 will be inserted backwards into the converging section 331 due to redundancy. The insulating member can also separate the second extension section 333 from the active material coating part 32, thereby reducing the probability that the second extension section 333 will be inserted backwards into the active material coating part 32 due to redundancy. This reduces the risk of short circuit in the battery cell 102 and improves the reliability and stability of the battery cell 102.

[0232] In an embodiment of this application, the conductive portion 33 includes a plurality of stacked tabs 311. The plurality of tabs 311 approach each other near the root of the active material coating portion 32 to form a triangular approaching section 331. The plurality of tabs 311 approach each other at a position on the approaching section 331 away from the active material coating portion 32 and connect to form a first extension section 332 and a second extension section 333.

[0233] For ease of understanding, a cross-section is made perpendicular to the length direction of the pole body 21 (the third direction F3 as shown in the figure), and the cross-sectional shape of the conductive part 33 is triangular.

[0234] The triangle can be an isosceles triangle, meaning that the vertex of the triangle is aligned with the center of the pole body 21 in the width direction, so that the connection position between the approaching section 331 and the first extension section 332 is centered in the width direction of the pole body 21; in the width direction of the pole body 21, the vertex of the triangle can be offset from the center of the pole body 21, so that the connection position between the approaching section 331 and the first extension section 332 can be offset relative to the center of the pole body 21 in the width direction, thereby allowing for the deformation amount for the bending of the conductive part 33.

[0235] In the above technical solution, multiple tabs 311 are brought together near the root of the active material coating part 32 to form a triangular approaching section 331, so that multiple tabs 311 can be stacked and formed into a whole that is not easy to loosen, thereby facilitating the connection between the conductive part 33 and the electrode body 21.

[0236] Referring again to Figure 5, in some optional embodiments of this application, the first end of the first extension 332 is connected to the approaching section 331 via the first bending portion 3320, and the three define a first opening groove 3341 between them. The second end of the first extension 332 is connected to the second extension 333 via the second bending portion 3330, and the three define a second opening groove 3342 between them. The openings of the first opening groove 3341 and the second opening groove 3342 face different directions and are spaced apart in the thickness direction of the mounting wall 111.

[0237] Specifically, the first extension segment 332 and the second extension segment 333 are arranged at an angle to each other in opposite directions. The two ends of the first bend 3320 are connected to the approach segment 331 and the beginning of the first extension segment 332, respectively, thereby defining the first opening groove 3341 by the approach segment 331, the first bend 3320 and the first extension segment 332. The two ends of the second bend 3330 are connected to the end of the first extension segment 332 and the beginning of the second extension segment 333, respectively, thereby defining the second opening groove 3342 by the first extension segment 332, the second bend 3330 and the second extension segment 333.

[0238] For example, the openings of the first opening groove 3341 and the second opening groove 3342 are arranged in opposite directions, that is, the openings of the first opening groove 3341 and the second opening groove 3342 are arranged at 180 degrees; as another example, the openings of the first opening groove 3341 and the second opening groove 3342 are arranged at an obtuse angle, so that the conductive part 33 is arranged in an approximate "S" shape.

[0239] Therefore, by making the conductive part 33 approximately "S" shaped, on the one hand, the conductive part 33 can play a better buffering role. When the battery cell 102 is used in a vibration environment, it can absorb vibration, protect the electrode component 3, and improve the reliability of the battery cell 102. On the other hand, by setting the first opening groove 3341 and the second opening groove 3342, the conductive part 33 is regularly bent. The bent part is less likely to be inserted into the active material coating part 32 due to redundancy, thereby reducing the risk of short circuit in the battery cell 102. It can also improve the mutual interference and scratching between the tabs 311 in the conductive part 33, reduce lithium plating, and further improve the reliability of the battery cell 102.

[0240] The insulating component extends at least partially into the first opening groove 3341 to block the first extension section 332 from the active material coating section 32. The insulating component isolates the side of the first extension section 332 facing the active material coating section 32 from the active material coating section 32, reducing the probability that the first extension section 332 of the conductive section 33 will be redundantly inserted into the active material coating section 32 or the approach section 331. This reduces the risk of short circuit in the battery cell 102 and improves the reliability of the battery cell 102.

[0241] In embodiments of this application, the insulating member extends at least partially toward the direction of the second opening groove 3342 to block the space between the second extension section 333 and the active material coating portion 32. The insulating member can block the space between the second extension section 333 and the side of the first extension section 332 away from the active material coating portion 32, or between the second extension section 333 and the side of the approaching section 331 away from the active material coating portion 32. This effectively blocks the space between the second extension section 333 and the active material coating portion 32, further reducing the probability that the conductive portion 33 will be inserted backwards into the active material coating portion 32, the first extension section 332, or the approaching section 331 due to redundancy. This reduces the risk of short circuit in the battery cell 102 and improves the reliability of the battery cell 102.

[0242] Please refer again to Figures 5 and 16-17. In the embodiments of this application, the first bent portion 3320 is centrally located in the width direction of the electrode body 21; or, the first bent portion 3320 is located on one side of the central position in the width direction of the electrode body 21, and the second bent portion 3330 is located on the other side of the central position in the width direction of the electrode body 21. This allows the first bent portion 3320 and the second bent portion 3330 to be arranged in the width direction of the electrode, so that the conductive portion 33 can be arranged in a roughly "S" shape, thereby meeting the design requirements.

[0243] For example, referring to Figures 5 and 16, the first bending portion 3320 is centered in the width direction of the pole body 21, and the second bending portion 3330 can be positioned slightly to the left of the center in the width direction relative to the pole body 21. In addition, the opening of the slot 334 defined by the converging section 331, the first bending portion 3320 and the first extension section 332 faces to the left, and the opening of the slot 334 defined by the first extension section 332, the second bending portion 3330 and the second extension section 333 faces to the right, so that the conductive portion 33 is arranged in an approximately "S" shape.

[0244] For example, referring to Figure 17, the first bending portion 3320 can be positioned slightly to the right of the center in the width direction relative to the pole body 21, and the second bending portion 3330 can be positioned slightly to the left of the center in the width direction relative to the pole body 21. In addition, the opening of the slot 334 defined by the converging section 331, the first bending portion 3320 and the first extension section 332 faces to the left, and the opening of the slot 334 defined by the first extension section 332, the second bending portion 3330 and the second extension section 333 faces to the right, so that the conductive portion 33 is arranged in an approximately "S" shape.

[0245] Please refer to Figure 5 again, and further refer to Figures 27-29. Figure 27 is a partial structural schematic diagram of the conductive portion 33 of the battery cell 102 shown in Figure 3 in a straightened state; Figure 28 is a partial structural schematic diagram of the conductive portion 33 of the battery cell 102 shown in Figure 3 connected to the terminal post component 2; Figure 29 is a partial structural schematic diagram of the terminal post component 2 of the battery cell 102 shown in Figure 3 connected to the housing component 1. In the embodiments of this application, the conductive portion 33 includes a plurality of stacked tabs 311, and the plurality of tabs 311 are connected at the end of the first bending portion 3320 away from the approaching section 331 to form a first connecting portion 3331. The first bending portion 3320 can be an arc-shaped structure, and the position of the first connecting portion 3331 can be the tangent position between the first bending portion 3320 and the first extension section 332.

[0246] By connecting the end of the first bending portion 3320 away from the approaching section 331 to form the first connecting portion 3331, multiple easily loosened tabs 311 that were originally stacked can be connected together. The multiple tabs 311 are not easy to loosen at the first connecting portion 3331. This can reduce the possibility that the tabs 311 may split after being bent and be inserted into the active material coating portion 32, thereby reducing the risk of short circuit in the battery cell 102 and improving the reliability of the battery cell 102.

[0247] Please refer to Figure 27 again. In the embodiment of this application, when the conductive part 33 is in a straightened state, the distance h1 between the first connecting part 3331 and the end of the active material coating part 32 near the mounting wall 111 is less than or equal to 2.5 mm.

[0248] The phrase "conductive part 33 is in a straightened state" here refers to the state in which the conductive part 33 extends along the height direction of the active material coating part 32 (the first direction F1 shown in the figure) before bending.

[0249] For example, the distance h1 between the first connecting part 3331 and the end of the active material coating part 32 near the mounting wall 111 can be 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, etc.

[0250] If the distance h1 between the first connecting part 3331 and the end of the active material coating part 32 near the mounting wall 111 is too large, the dimension of the converging section 331 in the thickness direction of the mounting wall 111 will be too large, making it easy for the multiple tabs 311 to loosen at the converging section 331, which may cause the tabs 311 to fork and be inserted upside down into the active material coating part 32; if the distance h1 between the first connecting part 3331 and the end of the active material coating part 32 near the mounting wall 111 is too small, the multiple tabs 311 will easily loosen at the first extension section 332, which may cause the tabs 311 to fork and be inserted upside down into the active material coating part 32.

[0251] In the above technical solution, by limiting the distance between the first connecting part 3331 and the end of the active material coating part 32 near the mounting wall 111 to meet the above range, the problem of multiple tabs 311 becoming loose after the conductive part 33 is bent can be reduced, and the possibility of tabs 311 splitting and being inserted into the active material coating part 32 can be reduced, thereby reducing the risk of short circuit in the battery cell 102 and improving the reliability of the battery cell 102.

[0252] Please refer to Figure 27 again. In the embodiment of this application, an insulating support 9 is provided between the end of the active material coating part 32 connected to the conductive part 33 and the mounting wall 111. The insulating support 9 has a through hole 902, the conductive part 33 passes through the through hole 902, and the conductive part 33 is connected to the pole body 21.

[0253] The insulating bracket 9 can support the active material coating part 32 and isolate the active material coating part 32 from the mounting wall 111 of the housing component 1, reducing the probability of contact between the active material coating part 32 and the mounting wall 111. This reduces the risk of corrosion of the mounting wall 111 of the housing component 1 due to the active material coating part 32 being exposed, reduces the risk of leakage, and thus improves the reliability and stability of the battery cell 102.

[0254] The perforation 902 has a first edge at the end near the active material coating part 32 and a second edge at the end near the pole body 21. The distance m1 between the first connecting part 3331 and the active material coating part 32 is greater than the distance m2 between the first edge and the active material coating part 32.

[0255] In other words, when the battery cell 102 is placed vertically, the first hole edge is the lowest hole edge of the perforation 902, the second hole edge is the highest hole edge of the perforation 902, and the first connecting part 3331 is higher than the lowest edge of the perforation 902. This makes the connection position of the multiple tabs 311 at the end of the first bending part 3320 away from the converging section 331 higher than the lowest edge of the perforation 902, further reducing the possibility of the conductive part 33 becoming loose, and making it more conducive to improving the reliability of the battery cell 102.

[0256] Please refer to Figure 5 again. In the embodiment of this application, the insulating bracket 9 includes a bracket body 91 and a first partition plate 92. In the width direction of the pole body 21 (the second direction F2 as shown in the figure), the size of the overlapping area between the first partition plate 92 and the first extension 332 is greater than half the size of the first extension 332 and smaller than the size of the first extension 332.

[0257] Here, "overlapping area" refers to the portion in a plane perpendicular to the height direction of the active material coating portion 32 where the projections of the first separator 92 and the first extension 332 overlap. Specifically, the dimension of the overlapping area of ​​the first separator 92 and the first extension 332 in the width direction of the pole body 21 is L1, and the dimension of the first extension 332 in the width direction of the pole body 21 is L2. L1 is greater than half of L2 and less than L2. For example, L1 can be 0.6, 0.7, 0.8, or 0.9 times L2.

[0258] In the above technical solution, by limiting the size of the overlapping area between the first partition plate 92 and the first extension section 332 to meet the above range, the first partition plate 92 can effectively support the first extension section 332, thereby improving the reliability of the conductive part 33 in the preset bending shape.

[0259] Referring again to Figures 5 and 27, in the embodiments of this application, a plurality of tabs 311 are connected at one end of the second bend 3330 near the second extension 333 to form a second connecting portion 3332. The second bend 3330 can be an arc-shaped structure, and the second connecting portion 3332 is located at the tangent point between the second bend 3330 and the second extension 333.

[0260] By connecting the second bending portion 3330 to one end near the second extension 333 to form the second connecting portion 3332, the multiple tabs 311 that were originally stacked and easily loosened can be connected together. The multiple tabs 311 are not easy to loosen at the second connecting portion 3332. This can reduce the possibility of the multiple tabs 311 being bent and then splitting and being inserted into the active material coating portion 32. On the other hand, it facilitates the connection between the second extension 333 and the electrode body 21.

[0261] Please refer to Figure 27 again. In the embodiment of this application, when the conductive part 33 is in a straightened state, the distance h2 between the first connecting part 3331 and the second connecting part 3332 is less than or equal to 16 mm, and the distance h3 between the second connecting part 3332 and the end of the second extension 333 away from the active material coating part 32 is greater than or equal to 8 mm.

[0262] For example, the distance h2 between the first connecting part 3331 and the second connecting part 3332 can be 8mm, 10mm, 12mm, 14mm, 16mm, etc., and the distance h3 between the second connecting part 3332 and the end of the second extension 333 away from the active material coating part 32 can be 8mm, 10mm, 12mm, 14mm, 16mm, etc.

[0263] In the above technical solution, by limiting the distance between the first connecting part 3331 and the second connecting part 3332 to meet the above range, on the one hand, the problem of multiple tabs 311 becoming loose after the conductive part 33 is bent can be reduced, and the possibility of tabs 311 splitting and causing them to be inserted into the active material coating part 32 can be reduced. On the other hand, after the conductive part 33 is bent, the second connecting part 3332 can be located between the second edge of the pole body 21 and the perforation 902 in the thickness direction of the mounting wall 111, thereby reducing the assembly space between the pole body 21 and the active material coating part 32, and making the structure of the battery cell 102 more compact.

[0264] Furthermore, by limiting the distance between the second connection portion 3332 and the end of the second extension portion 333 that is away from the active material coating portion 32 to meet the above range, the connection area between the second extension portion 333 and the electrode body 21 can be guaranteed, thereby improving the connection reliability between the conductive portion 33 and the electrode body 21, making the conductivity between the electrode component 3 and the electrode component 2 more stable and reliable, and thus improving the reliability of the battery cell 102.

[0265] Referring again to Figure 5, in the embodiment of this application, the conductive part 33 includes a tab 335, which includes a plurality of stacked tab pieces 311. The converging section 331, the first extension section 332, and the second extension section 333 are formed by different parts of the tab 335. That is, the tab 335 is directly connected to the electrode body 21, thus eliminating the need for the conductive element 336 and the connection step between the conductive element 336 and the tab 335, which is beneficial to improving the production efficiency of the battery cell 102.

[0266] Furthermore, by pre-gathering the multiple tabs 311 of the tab 335, the second extension 333 of the conductive part 33 can present a plate shape with multiple tabs 311 connected together and having a certain rigidity, rather than a loose and scattered multi-layer foil shape. This facilitates the connection between the tab 335 and the electrode body 21, making the welding between the tab 335 and the electrode body 21 more reliable. It is less likely to form gaps in the weld, which can improve the connection reliability and conductivity of the weld, making the conductivity between the electrode component 3 and the electrode component 2 more stable and reliable.

[0267] Please refer again to Figures 5 and 27-29. In the embodiments of this application, multiple tabs 311 are brought together and connected at the position of the approaching section 331 away from the active material coating part 32 to form a first extension section 332 and a second extension section 333. Multiple tabs 311 are connected at the second extension section 333 to form a third connecting part 3333. The third connecting part 3333 is an elongated strip extending along the length direction of the pole body 21, and the third connecting part 3333 is centrally located in the width direction of the pole body 21.

[0268] Multiple tabs 311 can be connected at the second extension 333 by ultrasonic welding to form a third connection part 3333. Ultrasonic welding ensures tight contact and connection between the surfaces of any two adjacent tabs 311, resulting in high weld strength and stability. This improves the structural integrity and reliability of the conductive part 33. Furthermore, ultrasonic welding offers high welding speed, enhancing welding efficiency. Alternatively, multiple tabs 311 can also be connected at the second extension 333 by laser welding. The second extension 333 and the electrode body 21 can be connected by laser welding.

[0269] In the above technical solution, by centered the third connecting part 3333 in the width direction of the pole body 21, the size requirements of the second extension 333 can be reduced, thereby reducing the difficulty of connecting the conductive part 33 and the pole body 21. On the other hand, the conductive part 33 can be bent and moved closer to the center position between the pole body 21 and the active material coating part 32, so that the shape of the conductive part 33 after bending is controllable.

[0270] Please refer to Figures 30-32. Figure 30 is a structural cross-sectional view of the battery cell 102 according to some embodiments of this application; Figure 31 is a partially enlarged view of the battery cell 102 shown in Figure 30; Figure 32 is a partial structural schematic diagram of the conductive portion 33 of the battery cell 102 shown in Figure 30 during shaping. In the embodiments of this application, the conductive portion 33 includes a tab 335 and a conductive element 336. The tab 335 is connected to one end of the active material coating portion 32 near the mounting wall 111. The tab 335 includes a plurality of stacked tab pieces 311. The conductive element 336 is connected between the tab 335 and the electrode post body 21. A portion of the conductive element 336 forms a second extension 333, and another portion of the conductive element 336 forms at least a portion of the first extension 332. At least a portion of the tab 335 forms a converging portion 331.

[0271] Therefore, by indirectly connecting the tab 335 and the terminal body 21 through the conductive element 336, the length of the tab 335 can be shortened, improving problems such as wrinkling, bending, and breakage of the tab 311. Furthermore, by flexibly designing the shape and material of the conductive element 336, the connection difficulty with the terminal body 21 can be reduced, improving the ease of connection between the conductive element 336 and the terminal body 21. In addition, the perforation 902 operation of the tab 335, the connection operation between the tab 335 and the terminal component 2 (which can be omitted), and the connection operation between the terminal component 2 and the housing component 1 are less likely to cause cracking at the connection point between the active material coating portion 32 and the conductive portion 33, thereby improving the reliability of the battery cell 102.

[0272] Please refer further to Figures 33 and 34. Figure 33 is an exploded view of the conductive portion 33 of the battery cell 102 shown in Figure 30; Figure 34 is a partial structural schematic diagram of the conductive portion 33 of the battery cell 102 shown in Figure 30 in a straightened state. In the embodiments of this application, the conductive member 336 has a slot 3361, and the tab 335 is at least partially inserted into the slot 3361.

[0273] Specifically, the conductive element 336 may include a first connecting segment 3362, which includes two clamping portions 3360. A slot 3361 is defined between the two clamping portions 3360. The end of the tab 335 away from the active material coating portion 32 is clamped between the two clamping portions 3360 and connected to the clamping portions 3360. Thus, the two clamping portions 3360 can be used to limit the end of the tab 335 away from the active material coating portion 32 (denoted as tab end 3351), thereby improving the connection reliability between the tab 335 and the conductive element 336.

[0274] The tab end 3351 located between the two clamping portions 3360 can be a structure in which the ends of multiple stacked tab pieces 311 are pre-connected together, thereby simplifying the processing steps and improving processing efficiency. Of course, the tab end 3351 located between the two clamping portions 3360 can also be the ends of multiple stacked tab pieces 311, that is, before the tab 335 is connected to the conductive element 336, the ends of the multiple stacked tab pieces 311 of the tab 335 are not pre-connected together by welding or other means.

[0275] Furthermore, the conductive element 336 may also include a second connecting segment 3363, which is directly connected to the pole body 21.

[0276] In embodiments of this application, the conductive element 336 includes an adapter piece, which comprises multiple stacked and connected adapter foils to make the adapter piece deformable. The material of the multiple adapter foils can be the same as the material of the tab 335, and the multiple adapter foils can be welded together at several key locations using methods such as ultrasonic welding to connect the multiple adapter foils together.

[0277] Since the multiple transition foils are relatively thin, they are equivalent to multiple thin plates. The transition piece formed by multiple transition foils is easier to bend than a one-piece molded transition piece. This allows the transition piece and the tab 335 to be bent as needed, thereby forming the conductive part 33 into a preset shape to meet design requirements.

[0278] Please refer to Figures 32-34 again, and further refer to Figures 35-37. Figure 35 is a schematic diagram of the structure of the electrode component 3 of the battery cell 102 shown in Figure 30 installed in the housing component 1; Figure 36 is a partial schematic diagram of the structure when the conductive part 33 of the battery cell 102 shown in Figure 30 is connected to the terminal component 2; Figure 37 is a partial schematic diagram of the structure when the terminal component 2 of the battery cell 102 shown in Figure 30 is connected to the housing component 1. In an embodiment where the mounting wall 111 is the wall of the shell body 11 opposite to the shell cover 12, during assembly, the multiple tabs 311 of the tabs 335 can be shaped and gathered together, and the adapter piece can be connected to the tabs 335 to form a conductive part 33. Then, the active material coating part 32 with the conductive part 33 is inserted into the shell body 11. After connecting the shell cover 12 to the shell body 11, the adapter piece extending out of the shell body 11 is connected to the pole body 21. Finally, the pole component 2 is rotated and fixed on the mounting wall 111 of the shell component 1. After assembly, the conductive part 33 formed by the connection of the tabs 335 and the adapter piece can be in an "S" shape.

[0279] Please refer to Figure 38, which is a structural schematic diagram of the battery cell 102 in some other embodiments of this application. In some other optional embodiments of this application, the approaching section 331, the first extension section 332, and the second extension section 333 define a third opening groove 3343, and the insulating member extends at least partially into the third opening groove 3343 to block the second extension section 333 and the active material coating portion 32.

[0280] Specifically, the second extension section 333 can be connected to the side of the electrode body 21 near the active material coating part 32, so that the second extension section 333 and the approach section 331 are arranged opposite to each other. The insulating member blocks the second extension section 333 and the active material coating part 32, which can reduce the probability that the second extension section 333 will be inserted into the active material coating part 32 or the approach section 331 due to redundancy. This can reduce the risk of short circuit in the battery cell 102 and improve the reliability of the battery cell 102.

[0281] Of course, the second extension section 333 can pass through the electrode body 21 and be connected to the side of the electrode body 21 away from the active material coating part 32, so that the electrode body 21 and the approach section 331 are arranged opposite to each other. With this arrangement, the electrode body 21 is blocked between the second extension section 333 and the active material coating part 32, and the insulating component is blocked between the electrode body 21 and the active material coating part 32. This further reduces the risk of short circuit in the battery cell 102 and helps to improve the reliability of the battery cell 102.

[0282] In some alternative embodiments of this application, the electrode body 21 has a through hole 210, and the second extension 333 passes through the through hole 210 and is connected to the hole wall of the through hole 210. The insulating component can block the electrode body 21 from the active material coating part 32, reducing the risk of short circuit in the battery cell 102 and improving the reliability of the battery cell 102.

[0283] Please refer to Figures 39-42. Figure 39 is a schematic diagram of the electrode post component provided in some embodiments of this application; Figure 40 is a top view of the electrode post component shown in Figure 39; Figure 41 is a view along direction B shown in Figure 40; Figure 42 is a cross-sectional view along line CC in Figure 40. In some embodiments of this application, the electrode post component 2 includes an electrode post body 21, a connecting structure 22, and an insulating structure 23. The connecting structure 22 surrounds the electrode post body 21 and is connected to the mounting wall 111. The insulating structure 23 is insulatingly fitted between the connecting structure 22 and the electrode post body 21. The electrode component 3 is connected to the electrode post body 21.

[0284] The adapter structure 22 surrounds the entire circumference of the electrode body 21 along the mounting hole 112, thus connecting the electrode body 21 and the mounting wall 111 in the outer peripheral area of ​​the electrode body 21. The insulating structure 23 insulates the mating position between the adapter structure 22 and the electrode body 21, preventing short circuits between them. The connection method between the adapter structure 22 and the mounting wall 111 is not limited; for example, it can be welded, riveted, drilled, or bonded. Furthermore, the electrode body 21 is connected to the electrode component 3 via a conductive part 33. The connection method between the conductive part 33 and the electrode body 21 is not limited; for example, it can be welded, riveted, drilled, or bonded.

[0285] In the above technical solution, the pole piece 2 has a simple structure and is easy to process. Since it includes two parts, the pole piece body 21 and the adapter structure 22, the shape and size of the pole piece body 21 and the adapter structure 22 can be designed separately based on different factors to flexibly adapt to the connection requirements of different types of housing parts 1 and electrode parts 3, thereby increasing the applicability of the pole piece 2.

[0286] For example, the adapter structure 22 can be configured to match the shape of the mounting hole 112. The shape of the mounting hole 112 can be designed as an elongated shape that facilitates the passage of the pole piece 2 and minimizes the rotation angle of the pole piece 2. At the same time, the pole piece body 21 can be designed as an elongated shape that matches the shape of the adapter structure 22, so that the pole piece body 21 has a larger area to connect with the conductive part 33. Alternatively, the pole piece body 21 can be designed as a circle that does not match the shape of the adapter structure 22, thereby reducing the connection area between the pole piece body 21 and the adapter structure 22, improving the uniformity of force at the connection between the pole piece body 21 and the adapter structure 22, and thus improving the connection reliability between the pole piece body 21 and the adapter structure 22.

[0287] In some embodiments of this application, the adapter structure 22 is formed as an elongated strip (such as a rectangle or racetrack shape) extending along the length direction of the mounting wall 111, and the outline shape of the electrode body 21 matches the outline shape of the adapter structure 22 (such as a rectangle or racetrack shape). As mentioned above, the electrode component 3 is connected to the electrode component 2 through the conductive part 33. When the outline shape of the electrode body 21 is formed as an elongated strip that matches the outline shape of the adapter structure 22, the area of ​​the electrode body 21 is larger, which is beneficial to increasing the connection area between the conductive part 33 and the electrode body 21, thereby improving the conductivity.

[0288] Referring to Figure 39, in some other embodiments of this application, the adapter structure 22 is formed as an elongated strip (such as a rectangle or racetrack shape) extending along the length direction of the mounting wall 111, and the pole body 21 is located at the center of the length of the adapter structure 22 and is circular. Therefore, when the pole body 21 is located at the center of the length of the elongated adapter structure 22 and is circular, it is beneficial to reduce the connection area between the pole body 21 and the adapter structure 22, improve the uniformity of force at the connection point between the pole body 21 and the adapter structure 22, thereby improving the connection reliability between the pole body 21 and the adapter structure 22.

[0289] Please refer to Figures 39-42. In some embodiments of this application, the insulating structure 23 is also sealed between the adapter structure 22 and the terminal body 21. Therefore, the insulating structure 23 not only insulates the adapter structure 22 from the terminal body 21, but also seals the mating position between the adapter structure 22 and the terminal body 21. This isolates the inside and outside of the housing component 1 after the adapter structure 22 is connected to the mounting wall 111, reducing the risk of electrolyte leakage from the mating position between the adapter structure 22 and the terminal body 21 to the outside of the housing component 1, and reducing the risk of liquids or dust from outside the housing component 1 entering the housing component 1 from the mating position between the adapter structure 22 and the terminal body 21, thereby improving the reliability of the battery cell 102.

[0290] In the above technical solution, since the insulating structure 23 is also sealed between the transition structure 22 and the pole body 21, when installing the pole component 2 onto the mounting wall 111 and connecting the transition structure 22 and the mounting wall 111, there is no need to install seals between the transition structure 22 and the mounting wall 111. This eliminates the need to apply significant sealing pressure to meet the compression requirements of the seals, thereby reducing the stress on the mounting wall 111 and protecting the housing component 1. This helps to reduce the wall thickness of the housing component 1 and lower material costs. Furthermore, since the mounting wall 111 is the end opposite the opening 113 of the housing body 11, it reduces the stress at the connection between the mounting wall 111 and the peripheral wall 114, as well as the stress on the peripheral wall 114. This helps to ensure the reliability of the housing body 11 and reduces the wall thickness and cost of the housing body 11.

[0291] Please refer again to Figures 39-42. In some embodiments of this application, the insulating structure 23 includes a sealing structure 231. In the embodiments of this application, the sealing structure 231 is made of a material that has both sealing and insulating properties, such as an elastic rubber component.

[0292] Referring again to Figures 39-42, by way of example, at least a portion of the sealing structure 231 is clamped between the adapter structure 22 and the pole body 21 in the inward and outward directions (e.g., the fifth direction F5) of the mounting wall 111.

[0293] In the embodiments of this application, the directions from the inside to the outside of the mounting wall 111, and the directions from the outside to the inside of the mounting wall 111, are collectively referred to as "the inward and outward directions of the mounting wall 111 (e.g., the fifth direction F5)". "The inside of the mounting wall 111" refers to the side of the mounting wall 111 facing the electrode component 3, and "the outside of the mounting wall 111" refers to the side of the mounting wall 111 away from the electrode component 3.

[0294] The sealing structure 231 includes at least a axial side portion 231a. The side of the axial side portion 231a facing the receiving cavity 13 is the inner side of the axial side portion 231a, and the side of the axial side portion 231a away from the electrode component 3 is the outer side of the axial side portion 231a. One of the transition structure 22 and the electrode body 21 is partially clamped on the outer side of the axial side portion 231a, and the other is partially clamped on the inner side of the axial side portion 231a. Thus, the axial side portion 231a is clamped between the transition structure 22 and the electrode body 21 in the inward and outward directions (e.g., the fifth direction F5) of the mounting wall 111 to achieve an axial seal between the transition structure 22 and the electrode body 21.

[0295] Therefore, by setting at least a portion of the sealing structure 231 to be clamped between the adapter structure 22 and the pole body 21 in the inward and outward directions (e.g., the fifth direction F5) of the mounting wall 111, an axial seal is achieved between the adapter structure 22 and the pole body 21. This axial seal provides a more reliable sealing effect and improves the leakage problem at the mating position of the adapter structure 22 and the pole body 21. Furthermore, by integrating the axial seal (such as the axial side portion 231a) into the pole component, the axial force on the mounting wall 111 can be reduced in the embodiments of this application.

[0296] Please refer again to Figures 39-42. Exemplarily, the sealing structure 231 is circumferentially disposed on the side of the adapter structure 22 facing the pole body 21 (i.e., the inner ring of the adapter structure 22). In the embodiments of this application, since the adapter structure 22 is disposed around the pole body 21 and connected to the mounting wall 111, the side of the adapter structure 22 facing the pole body 21 is the "inner ring 2211 of the adapter structure 22," and the side of the adapter structure 22 facing the mounting wall 111 is the "outer ring 2212 of the adapter structure 22." In the above technical solution, by circumferentially disposing the sealing structure 231 on the inner ring of the adapter structure 22, the sealing structure 231 can approach the mating position between the adapter structure 22 and the pole body 21. This facilitates sealing the mating position between the adapter structure 22 and the pole body 21 via a shorter path, improving the reliability of the seal. Furthermore, it helps to reduce the size of the sealing structure 231, reduce the sealing area, and easily achieve compression sealing, making the seal less prone to failure and improving the sealing effect.

[0297] Furthermore, when the insulating structure 23 includes a sealing structure 231, which is sandwiched between the adapter structure 22 and the pole body 21 to achieve a sealed fit between the adapter structure 22 and the pole body 21, and the adapter structure 22 is formed as an elongated strip extending along the length direction of the mounting wall 111, and the pole body 21 is located at the center of the length of the adapter structure 22 and is circular, the force at the connection position between the adapter structure 22 and the pole body 21 is uniform, making it easy to control the compression of the sealing structure 231, thereby improving the reliability of the sealed fit between the adapter structure 22 and the pole body 21. Moreover, the sealing area is relatively small, making it less prone to failure.

[0298] Please refer again to Figures 39-42. In some embodiments of this application, the electrode body 21 includes a peripheral portion 212. The adapter structure 22 is clamped on both sides of the peripheral portion 212 in the inward and outward directions of the mounting wall 111 by the insulating structure 23. At least a portion of the sealing structure 231 is clamped between the side of the peripheral portion 212 facing the electrode component 3 and the adapter structure 22.

[0299] In this embodiment, the peripheral portion 212 can be the outer peripheral structure of the pole body 21. Since the sealing structure 231 is arranged around the periphery of the transition structure 22 facing the pole body 21, the sealing structure 231 can be clamped between the peripheral portion 212 and the transition structure 22.

[0300] In this embodiment, the side of the peripheral portion 212 facing away from the electrode component 3 is the outer side of the peripheral portion 212, and the side of the peripheral portion 212 facing the receiving cavity 13 is the inner side of the peripheral portion 212. The transition structure 22 is limited to the outer side of the peripheral portion 212 by the insulating structure 23 to restrict the movement of the electrode body 21 relative to the transition structure 22 in the direction away from the electrode component 3. The transition structure 22 is also limited to the inner side of the peripheral portion 212 by the insulating structure 23 to restrict the movement of the electrode body 21 relative to the transition structure 22 in the direction towards the receiving cavity 13. Thus, the transition structure 22 is clamped on both sides of the peripheral portion 212 in the inner and outer directions (e.g., the fifth direction F5) of the mounting wall 111 by the insulating structure 23.

[0301] In the above technical solution, the electrode post component 2 has a simple structure and is easy to process, which can easily and effectively achieve the relative fixation and insulating fit between the electrode post body 21 and the adapter structure 22. The sealing structure component 231 is clamped between the peripheral portion 212 of the electrode post body 21 and the adapter structure 22, so that the sealing structure component 231 can be positioned at the mating position between the adapter structure 22 and the electrode post body 21. This facilitates sealing at the mating position of the adapter structure 22 and the electrode post body 21 with a shorter path, improving the reliability of the seal. It also helps to reduce the size of the sealing structure component 231, reduce the sealing area, and facilitate compression sealing, making the seal less prone to failure and improving the sealing effect. Furthermore, since at least a portion of the sealing structure component 231 is clamped between the peripheral portion 212 facing the electrode component 3 and the adapter structure 22, the sealing structure component 231 can seal from the peripheral portion 212 facing the receiving cavity 13, which can more effectively suppress electrolyte leakage from the mating position between the electrode post body 21 and the adapter structure 22, thereby improving the sealing effect.

[0302] Referring again to Figure 42, exemplarily, the insulating structure 23 further includes a first insulating member 232. The transition structure 22 is clamped to both sides of the peripheral portion 212 along the inner and outer directions (e.g., the fifth direction F5) of the mounting wall 111 via the first insulating member 232 and the sealing structure member 231. In this embodiment, the configuration of the transition structure 22 is not limited; it can be a single component or a combination of multiple components (e.g., two or more).

[0303] Since at least a portion of the sealing structure 231 (such as the axial portion 231a) is located on the side of the peripheral portion 212 facing the electrode component 3, at least a portion of the first insulating member 232 is located on the side of the peripheral portion 212 away from the electrode component 3. The transition structure 22 can be clamped on both sides of the peripheral portion 212 along the inner and outer directions (e.g., the fifth direction F5) of the mounting wall 111 by the first insulating member 232 and the sealing structure 231 respectively.

[0304] In the above technical solution, since the insulation structure 23 includes a first insulating component 232 and a sealing structure component 231 that are not integrated into a single piece, the design and processing of the insulation structure 23 can be simplified. Furthermore, depending on the specific requirements for cooperation with the pole body 21 and the adapter structure 22, the first insulating component 232 can be set as a basically incompressible insulating component without sealing effect (e.g., a plastic component), or it can be set as a compressible sealing component with sealing effect (e.g., an elastic rubber component), thereby meeting different practical requirements. In addition, when the first insulating component 232 is a basically incompressible insulating component without sealing effect (e.g., a plastic component), the compression amount of the sealing structure component 231 is easily controlled, improving the sealing effect.

[0305] Alternatively, in some other embodiments of this application, the sealing structure 231 can also be an integral structure with an outer periphery 212, located on the side of the periphery 212 facing the electrode component 3 and the side facing away from the electrode component 3, respectively. The transition structure 22 can be clamped on both sides of the periphery 212 by the sealing structure 231 along the inner and outer directions (e.g., the fifth direction F5) of the mounting wall 111. That is, the sealing structure 231 is an integral annular structure, which has both insulation and sealing properties. The sealing structure 231 includes axial side portions 231a located on the inner and outer sides of the periphery 212, respectively. In this way, the transition structure 22 can be clamped on both sides of the periphery 212 along the inner and outer directions (e.g., the fifth direction F5) of the mounting wall 111 by the two axial side portions 231a of the sealing structure 231. In the above technical solution, since the sealing structure 231 is an integral structure with an outer periphery 212, the number of parts can be reduced and the assembly process can be reduced.

[0306] Please refer again to Figures 39-42. In some embodiments of this application, the adapter structure 22 includes a first adapter ring 221 and a second adapter ring 222. The second adapter ring 222 is disposed on the side of the first adapter ring 221 away from the electrode component 3. The second adapter ring 222 is connected to the first adapter ring 221, and the first adapter ring 221 is connected to the mounting wall 111. The sealing structure 231 is clamped between the first adapter ring 221 and the peripheral portion 212. The second adapter ring 222 is insulated from and fixedly fitted to the peripheral portion 212 by the first insulating member 232.

[0307] For example, the first adapter ring 221 and the second adapter ring 222 can be welded, riveted, drilled, or bonded together. For instance, the outer ring of one of the first adapter rings 221 and 222 can be welded, riveted, drilled, or bonded to the mounting wall 111. Exemplarily, both the first adapter ring 221 and the second adapter ring 222 are made of aluminum and welded together, and both the first adapter ring 221 and the mounting wall 111 are made of aluminum and welded together, which helps to improve the welding yield.

[0308] Therefore, the adapter structure 22 includes a first adapter ring 221 and a second adapter ring 222 that are arranged internally and externally and assembled together, which facilitates the assembly and connection of the adapter structure 22 with the insulation structure 23 and the pole body 21, making the pole component 2 easy to process and manufacture, and making it easy to control the compression of the sealing structure component 231, thereby improving the sealing reliability.

[0309] The method by which the second adapter ring 222 is insulated from and fixedly fitted to the peripheral portion 212 by the first insulating member 232 is not limited. For example, referring again to Figures 39-42, the first insulating member 232 and the second adapter ring 222 can be injection molded separately. As another example, referring to Figure 43, which is a cross-sectional view of the pole post component provided in some embodiments of this application; the second adapter ring 222 may include a stop ring portion 2221, and at least a portion of the first insulating member 232 is clamped between the stop ring portion 2221 and the peripheral portion 212 along the inward and outward directions (e.g., the fifth direction F5) of the mounting wall 111. The material of the first insulating member 232 is not limited, and it can be, for example, a plastic part or an elastic rubber part.

[0310] Referring again to Figure 42, the adapter structure 22, by way of example, further includes a first insulating frame 224, which is connected to the side of the first adapter ring 221 facing the electrode component 3. Thus, the first insulating frame 224 can serve as insulation between the electrode component 3 and the first adapter ring 221, reducing the difficulty of setting up the insulation structure here. By way of example, the first insulating frame 224 has a pin, and the first adapter ring 221 has a hole; the pin is interference-fitted into the hole to achieve the connection between the first insulating frame 224 and the first adapter ring 221.

[0311] Please refer to Figure 44, which is a cross-sectional view of the pole member provided in some embodiments of this application. In some embodiments of this application, the adapter structure 22 includes a third adapter ring 223, which includes an integrally formed inner extension 2231 and an outer extension 2232. That is, the inner extension 2231 and the outer extension 2232 are different parts of a single integral piece, rather than two separate parts that are assembled together.

[0312] The inner extension 2231, facing the pole body 21 (i.e., the inner ring of the inner extension 2231), and the outer extension 2232, facing the pole body 21 (i.e., the inner ring of the outer extension 2232), are spaced apart in the inner and outer directions, respectively, by the insulating structure 23 along the inner and outer directions (e.g., the fifth direction F5) of the mounting wall 111, and are clamped on both sides of the peripheral portion 212. The sealing structure 231 is clamped between the inner extension 2231 and the peripheral portion 212, and the outer extension 2232 is insulated from and fixedly fitted to the peripheral portion 212 by the first insulating member 232.

[0313] The connection method between the third adapter ring 223 and the mounting wall 111 is not limited; for example, it can be welded, riveted, drilled, or glued. For instance, both the third adapter ring 223 and the mounting wall 111 are made of aluminum and are welded together, which helps improve the welding yield.

[0314] The method by which the outer extension 2232 is insulated from and fixedly engaged with the peripheral portion 212 by the first insulating member 232 is not limited. For example, referring again to FIG44, the outer extension 2232 rivets the first insulating member 232 against the peripheral portion 212. As another example, referring to FIG45, FIG45 is a cross-sectional view of the pole post component provided in some embodiments of this application; the first insulating member 232 and the pole post body 21, as well as the first insulating member 232 and the outer extension 2232 are respectively injection molded, and the inner extension 2231 rivets the sealing structure member 231 against the peripheral portion 212.

[0315] Referring again to Figure 45, the adapter structure 22 further includes a second insulating frame 225, which is connected to the side of the third adapter ring 223 facing the electrode component 3. Thus, the second insulating frame 225 can serve as insulation between the electrode component 3 and the third adapter ring 223, eliminating the need for a separate insulating structure. Exemplarily, the second insulating frame 225 has a pin, and the third adapter ring 223 has a socket; the pin is interference-fitted into the socket to connect the second insulating frame 225 and the third adapter ring 223.

[0316] Please refer to Figures 46 and 47. Figure 46 is a cross-sectional view of the battery cell 102 provided in some embodiments of this application; Figure 47 is a cross-sectional view of the battery cell 102 provided in some embodiments of this application. In some embodiments of this application, the adapter structure 22 includes a mating ring portion 2271, the terminal body 21 includes a through portion 214 passing through the mating ring portion 2271, and an inner limiting portion 215 and an outer limiting portion 216 connected to the through portion 214 and clamped on the inner and outer sides of the mating ring portion 2271. At least a portion of the sealing structure 231 is clamped between the mating ring portion 2271 and the inner limiting portion 215.

[0317] For example, the adapter structure 22 includes a fourth adapter ring 227, which includes a mating ring portion 2271 and is connected to the mounting wall 111, for example, the outer ring of the fourth adapter ring 227 is connected to the mounting wall 111. The connection method between the fourth adapter ring 227 and the mounting wall 111 is not limited; for example, it can be welded, riveted, drilled, or bonded. For example, both the fourth adapter ring 227 and the mounting wall 111 are made of aluminum and are welded together, which helps to improve the welding yield.

[0318] In the above technical solution, the electrode post component 2 has a simple structure and is easy to process, which can easily and effectively achieve the relative fixation and insulating fit between the electrode post body 21 and the adapter structure 22. The sealing structure 231 is clamped by the mating position of the electrode post body 21 and the mating ring 2271, so that the sealing structure 231 can be positioned at the mating position between the adapter structure 22 and the electrode post body 21. This facilitates sealing at the mating position of the adapter structure 22 and the electrode post body 21 with a shorter path, improving the reliability of the seal. It also helps to reduce the size of the sealing structure 231, reduce the sealing area, and facilitate compression sealing, making the seal less prone to failure and improving the sealing effect. Furthermore, since at least a portion of the sealing structure 231 is clamped between the mating ring 2271 and the inner limiting part 215, the sealing structure 231 can seal from the side of the mating ring 2271 facing the receiving cavity 13, which can more effectively suppress electrolyte leakage from the mating position between the electrode post body 21 and the adapter structure 22, thereby improving the sealing effect.

[0319] Please refer again to Figure 46. The insulating structure 23 may also include a second insulating member 234, wherein at least a portion of the sealing structure 231 is clamped between the inner limiting portion 215 and the mating ring portion 2271, and at least a portion of the second insulating member 234 is clamped between the outer limiting portion 216 and the mating ring portion 2271.

[0320] In the above technical solution, since the insulation structure 23 includes a second insulating component 234 and a sealing structure component 231 that are not integrated into a single piece, the design and processing of the insulation structure 23 can be simplified. Furthermore, depending on the specific requirements for cooperation with the pole body 21 and the adapter structure 22, the second insulating component 234 can be set as a basically incompressible insulating component without sealing effect (e.g., a plastic component), or it can be set as a compressible sealing component with sealing effect (e.g., an elastic rubber component), thereby meeting different practical requirements. In addition, when the second insulating component 234 is a basically incompressible insulating component without sealing effect (e.g., a plastic component), the compression amount of the sealing structure component 231 is easily controlled, improving the sealing effect.

[0321] Alternatively, referring to Figure 47; in some other embodiments of this application, the sealing structure 231 can also be an integral structure with a mating ring 2271 surrounding it, located on the side of the mating ring 2271 facing the electrode component 3 and the side facing away from the electrode component 3, respectively. The electrode post body 21 is clamped on both sides of the mating ring 2271 by the sealing structure 231 along the inner and outer directions (e.g., the fifth direction F5) of the mounting wall 111. That is, the sealing structure 231 is an integral ring structure, which has both insulation and sealing properties. The sealing structure 231 includes axial side portions 231a located on the inner and outer sides of the mating ring 2271, respectively. In this way, the transition structure 22 can be clamped on both sides of the mating ring 2271 along the inner and outer directions (e.g., the fifth direction F5) of the mounting wall 111 by the two axial side portions 231a of the sealing structure 231. In the above technical solution, since the sealing structure 231 is an integral structure with a mating ring 2271 surrounding it, the number of parts and assembly steps can be reduced.

[0322] In the embodiments of this application, when the pole body 21 includes a through portion 214, and an inner limiting portion 215 and an outer limiting portion 216 connected to the through portion 214 and clamped on both sides of the mating ring portion 2271, the configuration of the pole body 21 is not limited. It can be a single part or a combination of multiple parts (such as two or more).

[0323] For example, referring again to Figure 46, the outer limiting part 216 and the through part 214 are assembled and connected on the side of the mating ring 2271 opposite to the inner limiting part 215. The assembly and connection method of the outer limiting part 216 and the through part 214 is not limited; for example, welding, drilling, adhesive bonding, etc., are all acceptable. Assembly and connection refers to the connection of two parts together through a connection process. Therefore, by setting the outer limiting part 216 and the through part 214 as separate parts and assembling them, the structure of the pole body 21 is simple and easy to assemble and connect with the transition structure 22. Furthermore, when the outer limiting part 216 and the through part 214 are welded, the thermal impact on the sealing structure 231 clamped between the inner limiting part 215 and the mating ring 227 can be reduced, improving the sealing reliability of the sealing structure 231.

[0324] In the above embodiments, the connection method between the through-hole portion 214 and the inner limiting portion 215 is not limited; they can be an integral part or separate parts pre-connected together. For example, the end of the through-hole portion 214 facing away from the inner limiting portion 215 may include a riveting portion 2141. During assembly, the through-hole portion 214 can be inserted through the mating ring portion 2271 fitted with the insulating structure 23 along the direction from the inner limiting portion 215 to the outer limiting portion 216. Then, the riveting portion 2141 is riveted to restrict the through-hole portion 214 from disengaging along the direction from the outer limiting portion 216 to the inner limiting portion 215. Afterward, the riveting portion 2141 and the outer limiting portion 216 can be connected, facilitating the connection between the through-hole portion 214 and the outer limiting portion 216, for example, by welding. Alternatively, the riveting portion 2141 can be omitted, eliminating the riveting process after the through-hole portion 214 is inserted.

[0325] The subsequent riveting process.

[0326] For example, please refer again to Figure 47; in some other embodiments of this application, the outer limiting part 216 and the through part 214 are integral parts, and the outer limiting part 216 rivets the second insulating member 234 against the mating ring part 2271. In the above technical solution, the assembly connection between the outer limiting part 216 and the insulating structure 23 and the transition structure 22 is achieved by riveting, which reduces the thermal impact of the heat generated when the outer limiting part 216 is connected to the insulating structure 23 and the transition structure 22 on the sealing structure member 231, and improves the sealing reliability of the sealing structure member 231. In addition, by riveting the outer limiting part 216 to press the second insulating member 234 against the mating ring part 2271, the compression amount of the sealing structure member 231 can be easily controlled, achieving a better compression effect.

[0327] In the above embodiments, the connection method between the through-hole portion 214 and the inner limiting portion 215 is not limited; they can be an integral part or separate parts pre-connected together. For example, during assembly, the through-hole portion 214 can be threaded through the mating ring portion 2271 fitted with the insulating structure 23 along the direction from the inner limiting portion 215 to the outer limiting portion 216, and then the outer limiting portion 216 can be riveted to restrict the relative movement between the pole member 21 and the transition structure 22.

[0328] The pole body 21 can be a solid structure or a hollow structure. For example, when the pole body 21 is a hollow structure, please refer to Figure 47; the pole body 21 includes a first pole member 21a and a second pole member 21b. The second pole member 21b is composed of a through part 214, an inner limiting part 215 and an outer limiting part 216, and is installed on the mounting wall 111. The through-hole 21b1 extends through the mounting wall 111 in the inward and outward directions of the through-hole 214. The first electrode post 21a is assembled on the side of the second electrode post 21b away from the electrode component 3 and covers the through-hole 21b1, so as to form an open receiving space between the first electrode post 21a and the second electrode post 21b in the direction of the electrode component 3. A portion of the conductive part 33 can extend into the receiving space and connect to the first electrode post 21a, so that the electrode post body 21 can play the role of storing the conductive part 33, thereby reducing the space occupied by the conductive part 33 in the receiving cavity 13 and improving the energy density of the battery cell 102.

[0329] Referring again to Figure 46, in some embodiments of this application, the adapter structure 22 further includes a third insulating frame 228, which is connected to the side of the fourth adapter ring 227 facing the electrode component 3. Thus, the third insulating frame 228 can serve as insulation between the electrode component 3 and the fourth adapter ring 227, eliminating the need for a separate insulating structure. Exemplarily, the third insulating frame 228 has a pin, and the fourth adapter ring 227 has a socket; the pin is interference-fitted into the socket to connect the third insulating frame 228 and the fourth adapter ring 227.

[0330] Please refer to Figure 48, which is a cross-sectional view of the battery cell 102 provided in some embodiments of this application. In some embodiments of this application, the mounting wall 111 has a mounting hole 112, and a sealing ring 14 is provided around the mounting hole 112. The sealing ring 14 is clamped between the terminal post component 2 and the mounting wall 111. Therefore, the terminal post component 2 has a simple structure, is easy to process, and is easy to assemble and connect with the mounting wall 111.

[0331] In some embodiments of this application, the mounting wall 111 has a mounting hole 112, the pole post component 2 is covered by the mounting hole 112, and the edge of the transition structure 22 overlaps one side of the mounting wall 111 in the wall thickness direction. In this way, by covering one side of the mounting wall 111 in the wall thickness direction, that is, covering the outside of the mounting wall 111, or covering the inside of the mounting wall 111, the assembly of the transition structure 22 and the mounting wall 111 is facilitated.

[0332] Exemplarily, the adapter structure 22 is welded to the mounting wall 111. For example, after the adapter structure 22 is placed on the mounting wall 111, the adapter structure 22 and the mounting wall 111 can be connected by welding, which facilitates processing and ensures better reliability of the connection between the adapter structure 22 and the mounting wall 111. For example, welding can be performed from the outside of the mounting wall 111 so that the weld formed by the connection is exposed on the side of the mounting wall 111 away from the electrode component 3 (i.e., the side away from the active material coating portion 32), thereby facilitating welding operations and increasing the welding space. This application is not limited to this; for example, in some other embodiments of this application, the adapter structure 22 can also be configured to pass through the mounting hole 112 and be riveted to the mounting wall 111, etc.

[0333] Please refer to Figures 49 and 50. Figure 49 is a partial cross-sectional view of a battery cell 102 provided in some embodiments of this application, in which the terminal component 2 is in a state before being covered by the mounting wall 111; Figure 50 is a state diagram of the terminal component 2 after being covered by the mounting wall 111 as shown in Figure 49.

[0334] Referring to Figures 49 and 50, in some embodiments, when the electrode component 3 is connected to the electrode post component 2 first, and then the electrode post component 2 is assembled and connected to the mounting wall 111, the electrode component 3 and the electrode post component 2 can be connected after the electrode component 3 and the electrode post component 2 are connected (for example, the electrode post component 2 and the electrode component 3 can be connected first, then installed together into the housing 11, and then the electrode post component 2 can be extended from the mounting hole 112 to the outside of the mounting wall 111; or, for example, the electrode component 3 is installed into the housing 11, the conductive part 33 passes through the mounting hole 112, and is connected to the electrode post component 2 which is pre-installed on the outside of the mounting wall 111), the electrode post component 2 is covered at the mounting hole 112 of the mounting wall 111 from the outside of the mounting wall 111 (i.e., the side away from the active material coating part 32). At this time, the edge of the adapter structure 22 overlaps the side of the mounting wall 111 away from the electrode component 3. Therefore, since the pole piece 2 is covered by the mounting wall 111 from the outside, it facilitates the assembly and connection of the pole piece 2 and the mounting wall 111, which helps to improve the connection reliability between the pole piece 2 and the mounting wall 111.

[0335] Referring to Figures 49 and 50, in some embodiments of this application, when the edge of the adapter structure 22 overlaps with the side of the mounting wall 111 facing away from the electrode component 3, a first recess 1111 surrounding the mounting hole 112 can be provided on the mounting wall 111. The first recess 1111 is open in the direction facing away from the electrode component 3 (that is, the first recess 1111 is open in the direction facing away from the active material coating portion 32). The edge of the adapter structure 22 is embedded in the first recess 1111, wherein the edge of the adapter structure 22 has a flange portion 22a surrounding the adapter structure 22, and the flange portion 22a is embedded in the first recess 1111. This facilitates the support and positioning of the connection between the adapter structure 22 and the mounting wall 111, and is beneficial for welding the two together from the outside of the mounting wall 111 (that is, the side facing away from the active material coating portion 32).

[0336] Referring again to Figures 49 and 50, exemplarily, the thickness of the flange 22a matches the depth T1 of the first recess 1111, where "matching" means that the thickness of the flange 22a is substantially the same as the depth of the first recess 1111. This facilitates welding of the flange 22a to the mounting wall 111. The thickness of the flange 22a relative to the depth of the first recess 1111 is not too large, reducing unnecessary space occupation, and the thickness of the flange 22a relative to the depth of the first recess 1111 is not too small, meeting welding strength requirements.

[0337] Referring to Figures 49-51, Figure 51 is an exploded view of a portion of the battery cell 102 provided in some embodiments of this application. In some embodiments of this application, the mounting hole 112 is an elongated hole (e.g., rectangular, elliptical, or racetrack-shaped), and the terminal post 2 is formed as an elongated structure (e.g., rectangular, elliptical, or racetrack-shaped) that matches the shape of the mounting hole 112. When the electrode component 3 is first connected to the terminal post 2, and then the terminal post 2 and the electrode component 3 are installed together into the housing 11, and then the terminal post 2 extends from the mounting hole 112 to the outside of the mounting wall 111, and then the terminal post 2 is flipped from the outside of the mounting wall 111 to cover the mounting hole 112, and then the terminal post 2 is connected to the mounting wall 111, if the terminal post 2 is set as an elongated structure that matches the shape of the mounting hole 112, the terminal post 2 can be adjusted so that its thickness direction is parallel to the width direction of the mounting hole 112 (e.g., as shown in Figure 51). After the electrode component 2 passes through the mounting hole 112 at an angle close to the mounting wall 111 (e.g., the first direction F1 shown in Figure 51), the thickness direction of the electrode component 2 is rotated to be close to the thickness direction of the mounting wall 111 (e.g., the first direction F1 shown in Figure 51). This reduces the space required for the flipping movement of the electrode component 2, thereby reducing the space required for the flipping of the electrode component 2. This helps to shorten the length of the conductive part 33, save materials, reduce costs, and reduce the redundancy of the conductive part 33, reducing the space occupied by the conductive part 33 in the receiving cavity 13, which is beneficial to improving the energy density of the battery cell 102.

[0338] Please refer to Figures 52 and 53. Figure 52 is a partial cross-sectional view of a battery cell 102 provided in some embodiments of this application, in which the terminal component 2 is in a state before being covered by the mounting wall 111; Figure 53 is a state diagram of the terminal component 2 after being covered by the mounting wall 111 as shown in Figure 52.

[0339] Referring to Figures 52 and 53, in some embodiments, when the electrode component 3 is connected to the electrode post component 2 first, and then the electrode post component 2 is assembled and connected to the mounting wall 111, the electrode component 3 and the electrode post component 2 can be installed together into the housing 11 after the connection. This allows the electrode post component 2 to be placed over the mounting hole 112 of the mounting wall 111 from the inside (i.e., the side facing the active material coating portion 32). At this time, the edge of the adapter structure 22 overlaps with the side of the mounting wall 111 facing the electrode component 3. Therefore, since the electrode post component 2 is located from the inside of the mounting wall 111 within the mounting hole 112, the electrode component 3 and the electrode post component 2 can be installed together into the housing 11 without the electrode post component 2 needing to pass through the mounting hole 112, thus reducing the number of steps and simplifying the operation.

[0340] Referring to Figures 52 and 53, in some embodiments of this application, when the edge of the adapter structure 22 overlaps with the side of the mounting wall 111 facing the electrode component 3, the edge of the adapter structure 22 has a second recess 22b that opens in the direction away from the electrode component 3 (i.e., the second recess 22b opens in the direction away from the active material coating portion 32). The mounting wall 111 includes an overlapping portion 1112 protruding into the mounting hole 112, and the overlapping portion 1112 is embedded in the second recess 22b. This facilitates the support and positioning of the connection between the electrode component 2 and the mounting wall 111, and allows for welding the two together from the outside of the mounting wall 111 (i.e., the side away from the active material coating portion 32).

[0341] Referring again to Figures 52 and 53, exemplarily, the thickness of the overlapping portion 1112 matches the groove depth T2 of the second sinker 22b. Here, "matching" means that the thickness of the overlapping portion 1112 is substantially the same as the groove depth of the second sinker 22b. This facilitates welding the overlapping portion 1112 to the mounting wall 111. The thickness of the overlapping portion 1112 relative to the groove depth of the second sinker 22b is not too large, reducing unnecessary space occupation; nor is the thickness of the overlapping portion 1112 relative to the groove depth of the second sinker 22b too small, thus meeting welding strength requirements.

[0342] In some embodiments of this application, referring again to FIG5, the electrode post component 2 forms a first receiving groove 201 that is recessed relative to the mounting wall 111 in the direction away from the electrode component 3 and open in the direction towards the electrode component 3. The electrode component 3 is connected to the electrode post component 2 via a conductive part 33. At least a portion of the conductive part 33 is received in the first receiving groove 201 and connected to the electrode post body 21. That is, the electrode post component 2 forms the first receiving groove 201, the groove wall of the first receiving groove 201 is formed by the electrode post component 2, the first receiving groove 201 is recessed in the direction away from the active material coating part 32, and the first receiving groove 201 is open in the direction towards the active material coating part 32, so that the first receiving groove 201 communicates with the receiving cavity 13.

[0343] Therefore, by providing a first receiving groove 201 to accommodate the conductive part 33, the space occupied by the conductive part 33 in the receiving cavity 13 can be reduced, allowing the receiving cavity 13 to have a larger space to accommodate the active material coating part 32. This is beneficial for increasing the volume of the active material coating part 32, thereby increasing the energy density of the battery cell 102. Moreover, since the first receiving groove 201 is open towards the electrode component 13, the conductive part 33 can be easily inserted into the first receiving groove 201, reducing the difficulty of operation.

[0344] For example, referring again to FIG5, the first receiving groove 201 is formed on the side of the electrode component 3 (i.e. the side facing the active material coating portion 32) of the electrode body 21 and the adapter structure 22. The adapter structure 22 protrudes relative to the mounting wall 111 in the direction away from the electrode component 3 (i.e. the direction away from the active material coating portion 32), so that the first receiving groove 201 is recessed relative to the mounting wall 111 in the direction away from the electrode component 3.

[0345] Therefore, by processing the adapter structure 22 into an outwardly protruding shape, a portion of the first receiving groove 201 is formed on the side of the pole body 21 facing the electrode component 3, and another portion of the first receiving groove 201 is formed on the side of the adapter structure 22 facing the electrode component 3. The first receiving groove 201 has a shape that is recessed relative to the mounting wall 111 in the direction away from the electrode component 3. Thus, both the side of the pole body 21 facing the electrode component 3 and the side of the adapter structure 22 facing the electrode component 3 have a space for the first receiving groove conductive part 33. This not only facilitates the storage of the conductive part 33 to a greater extent, but also facilitates the design of the conductive part 33 in various forms.

[0346] In other embodiments of this application, referring to FIG45, when the adapter structure 22 does not bulge relative to the mounting wall 111 in the direction away from the electrode component 3 (i.e., the direction away from the active material coating portion 32), the first receiving groove 201 recessed relative to the mounting wall 111 in the direction away from the electrode component 3 can also be defined by the height difference between the adapter structure 22 and the electrode body 21.

[0347] In some embodiments of this application, referring again to FIG5, the surface of the end of the electrode body 21 facing the electrode component 3 is the inner end face 211 of the electrode body 21. The inner end face 211 of the electrode body 21 forms the first receiving groove 201, and the conductive part 33 is connected to the inner end face 211 of the electrode body 21. That is, at least a portion of the inner end face 211 of the electrode body 21 defines the groove wall of the first receiving groove 201, and the conductive part 33 is connected to the portion of the inner end face 211 of the electrode body 21 that serves as the groove wall of the first receiving groove 201. In the above technical solution, at least a portion of the first receiving groove 201 is formed by the side surface of the electrode body 21 facing the electrode component 3, and the conductive part 33 housed in the first receiving groove 201 can easily contact and connect to the electrode body 21, improving connection convenience and simplifying the structure.

[0348] For example, when at least a portion of the conductive part 33 is accommodated in the first receiving groove 201, the pole connection portion of the conductive part 33 (e.g., the tab 335 or the conductive element 336) (e.g., the folding portion 313 of the tab 335 as described herein, or the second connecting segment 3363 or the first conductive segment 3365 of the conductive element 336) can be laid on the inner end face 211 of the pole body 21 and connected to the inner end face 211 of the pole body 21. During processing, the pole connection portion of the conductive part 33 can be first inserted into the first receiving groove 201, and then the pole connection portion can be laid on the inner end face 211 of the pole body 21 and connected to the inner end face 211 of the pole body 21.

[0349] For example, the conductive part 33 may include a pole connection part, which may be a relatively rigid plate shape, such as one that will not bend or deform downward under the action of gravity, such as the folding part 313 of the tab 335 described herein (such as an ultrasonic weld), or the second connecting section 3363 (such as a metal sheet) or the first conductive section 3365 (such as a metal sheet) of the conductive member 336.

[0350] For example, referring to FIG5, regardless of whether the adapter structure 22 protrudes relative to the mounting wall 111 in a direction away from the electrode component 3, the position of the inner end face 220 of the adapter structure 22 adjacent to the electrode body 21 is a surrounding region 2201 that surrounds the electrode body 21, and the surrounding region 2201 is flush with the inner end face 211 of the electrode body 21. The inner end face 220 of the adapter structure 22 can be a planar structure or a non-planar structure, such as a protruding shape, and the outermost ring of the inner end face 220 of the adapter structure 22 facing the electrode body 21 is the surrounding region 2201.

[0351] For example, when the inner end face 211 of the pole body 21 is set to be large (for example, the adapter structure 22 is formed as an elongated strip extending along the length direction of the mounting wall 111, and the outline shape of the pole body 21 matches the outline shape of the adapter structure 22), and when the surrounding area 2201 is flush with the inner end face 211 of the pole body 21, the pole connection portion of the conductive part 33 (for example, the folding portion 313 of the tab 335 described herein, or the second connecting segment 3363 of the conductive member 336) can be completely laid flat on the inner end face 211 of the pole body 21.

[0352] For example, referring to Figures 39 and 43, when the inner end face 211 of the pole body 21 is small (for example, the adapter structure 22 is set as an elongated strip extending along the length direction of the mounting wall 111, and the pole body 21 is located in the center of the adapter structure 22 and has a circular outline), and when the surrounding area 2201 is flush with the inner end face 211 of the pole body 21, a portion of the pole connection portion of the conductive part 33 (for example, the folding portion 313 of the tab 335 described herein, or the second connecting segment 3363 of the conductive element 336) can be laid flat on the inner end face 211 of the pole body 21, and the remaining portion can be laid flat on the surrounding area 2201, so that the pole connection portion of the conductive part 33 (for example, the pole connection portion is also elongated) can be supported as a whole, which facilitates the clamping of the welding nozzle, so that the conductive part 33 can be reliably connected to the pole body 21.

[0353] For example, the conductive part 33 may include a pole connection part, which may be a relatively rigid plate shape, such as one that will not bend or deform downward under the action of gravity, such as the folding part 313 of the tab 335 described herein (such as an ultrasonic weld), or the second connecting section 3363 (such as a metal sheet) or the first conductive section 3365 (such as a metal sheet) of the conductive member 336.

[0354] For example, referring to FIG44, regardless of whether the adapter structure 22 protrudes relative to the mounting wall 111 in a direction away from the electrode component 3, the position of the inner end face 220 of the adapter structure 22 adjacent to the electrode body 21 is a surrounding region 2201 surrounding the electrode body 21, and the inner end face 211 of the electrode body 21 protrudes out of the surrounding region 2201 in a direction towards the electrode component 3. The inner end face 220 of the adapter structure 22 can be a planar structure or a non-planar structure, such as a protruding shape, and the outermost ring of the inner end face 220 of the adapter structure 22 facing the electrode body 21 is the surrounding region 2201.

[0355] Therefore, by setting the inner end face 211 of the electrode body 21 to protrude out of the surrounding area 2201 in the direction of the electrode component 3, the electrode body 21 can be retracted inward in the direction of the receiving cavity 13 when the height of the electrode body 21 is constant, so as to reduce the space occupied by the electrode component 2 on the outside of the housing component 1 and reduce the size of the battery cell 102 in the direction of setting the electrode component 2 (for example, the first direction F1 shown in FIG3).

[0356] For example, when the inner end face 211 of the electrode body 21 is set to be large (for example, the adapter structure 22 is formed as an elongated strip extending along the length direction of the mounting wall 111, and the outline shape of the electrode body 21 matches the outline shape of the adapter structure 22), and when the inner end face 211 of the electrode body 21 protrudes from the surrounding area 2201 in the direction of the electrode component 3, the electrode connection portion of the conductive part 33 (for example, the folding portion 313 of the tab 335 described herein, or the second connecting segment 3363 of the conductive member 336) can be completely laid flat on the inner end face 211 of the electrode body 21.

[0357] For example, referring to FIG44, when the inner end face 211 of the electrode body 21 is small (for example, the adapter structure 22 is configured as an elongated strip extending along the length direction of the mounting wall 111, the electrode body 21 is located in the center of the adapter structure 22 and has a circular outline), and when the inner end face 211 of the electrode body 21 protrudes from the surrounding area 2201 in the direction of the electrode component 3, the conductive part 33 can be configured to include a tab 335 and a conductive element 336 connected to the tab 335. The conductive element 336 includes a first conductive segment 3365 laid on the inner end face 211 of the electrode body 21, and a second conductive segment 3366 offset from the inner end face 211 of the electrode body 21. The second conductive segment 3366 protrudes relative to the first conductive segment 3365 in the direction away from the electrode component 3 (i.e., towards the outside, or towards the direction away from the active material coating part 32), and the tab 335 is connected to the second conductive segment 3366. Therefore, the height difference between the inner end face 211 of the electrode body 21 and the surrounding area 2201 can be used to accommodate the second conductive segment 3366 and the tab 335 of the conductive element 336, thereby making full use of space, reducing the space occupied by the conductive part 33 in the receiving cavity 13, and improving the energy density of the battery cell 102. For example, if the part connecting the tab 335 and the second conductive segment 3366 (such as the folding part 313 described herein) is elongated, the second conductive segment 3366 can also be elongated, while the first conductive segment 3365 can be set as a circle that matches the electrode body 21, which can meet the connection requirements. In addition, when the conductive element 336 includes the first conductive segment 3365 and the second conductive segment 3366, in order to ensure that the second conductive segment 3366 protrudes relative to the first conductive segment 3365 in the direction away from the electrode component 3, a material with a certain hardness and thickness can be selected to process the conductive element 336, for example, the conductive element 336 can be a metal sheet.

[0358] For example, referring to FIG45, regardless of whether the adapter structure 22 protrudes relative to the mounting wall 111 in a direction away from the electrode component 3, the position of the inner end face 220 of the adapter structure 22 adjacent to the electrode body 21 is a surrounding region 2201 surrounding the electrode body 21. The surrounding region 2201 protrudes from the inner end face 211 of the electrode body 21 in the direction towards the electrode component 3. The inner end face 220 of the adapter structure 22 can be a planar structure or a non-planar structure, such as a protruding shape. The outermost ring of the inner end face 220 of the adapter structure 22 facing the electrode body 21 is the surrounding region 2201.

[0359] For example, referring to FIG47, when the inner end face 211 of the electrode body 21 is set to be large (for example, the adapter structure 22 is formed as an elongated strip extending along the length direction of the mounting wall 111, and the outline shape of the electrode body 21 matches the outline shape of the adapter structure 22), and when the surrounding area 2201 protrudes from the inner end face 211 of the electrode body 21 in the direction toward the electrode component 3, the electrode connection portion of the conductive part 33 (for example, the folding portion 313 of the tab 335 described herein, or the second connecting segment 3363 of the conductive member 336) can be completely laid flat on the inner end face 211 of the electrode body 21.

[0360] For example, referring to FIG45, when the inner end face 211 of the electrode body 21 is small (for example, the adapter structure 22 is configured as an elongated strip extending along the length direction of the mounting wall 111, and the electrode body 21 is located in the center of the adapter structure 22 with a circular outline), and when the surrounding area 2201 protrudes from the inner end face 211 of the electrode body 21 in the direction toward the electrode component 3, the conductive element 336 can be configured to include a first conductive segment 3365 laid on the inner end face 211 of the electrode body 21, and a third conductive segment 3367 offset from the inner end face 211 of the electrode body 21. The third conductive segment 3367 protrudes relative to the first conductive segment 3365 in the direction toward the electrode component 3, and the tab 335 is connected to the third conductive segment 3367. Thus, the conductive element 336 can satisfy both the connection requirements with the inner end face 211 of the electrode body 21 and the connection requirements with the tab 335. Furthermore, when the conductive element 336 includes a first conductive segment 3365 and a third conductive segment 3367, in order to ensure that the third conductive segment 3367 protrudes relative to the first conductive segment 3365 towards the electrode component 3, the conductive element 336 can be made of a material with a certain hardness and thickness. For example, the conductive element 336 can be a metal sheet. For example, if the part where the tab 335 connects to the third conductive segment 3367 (such as the retracted portion 313 described herein) is elongated, the third conductive segment 3367 can also be set to be elongated, while the first conductive segment 3365 can be set to a shape that matches the mating region 211a (e.g., circular), which can satisfy the connection requirements.

[0361] Please refer to Figures 54 and 55. Figure 54 is a structural cross-sectional view of the battery cell 102 according to some embodiments of this application; Figure 55 is a partially enlarged view of the battery cell 102 shown in Figure 54. In some embodiments, the electrode body 21 forms a second receiving groove 202, which is open away from the receiving cavity, and the bottom wall of the second receiving groove 202 is provided with a through hole 210. The conductive part 33 passes through the through hole 210 and is at least partially received in the second receiving groove 202.

[0362] In the above technical solution, on the one hand, the electrode body 21 is provided with a second receiving groove 202, which can reduce the weight of the electrode body 21 to a certain extent, thereby improving the weight energy density of the battery cell 102 and the battery 100; on the other hand, since the groove opening of the second receiving groove 202 is formed on the outer end face 213 of the electrode body 21, and the outer end face 213 of the electrode body 21 is the surface of the electrode body 21 away from the active material coating part 32, the second receiving groove 202 can be opened in the direction away from the active material coating part 32. In this way, when at least a part of the conductive part 33 is accommodated in the second receiving groove 202, the conductive part 33 can be easily stored and organized through the groove opening of the second receiving groove 202, and the electrical connection operation between the conductive part 33 and the electrode body 21 can be easily achieved through the groove opening of the second receiving groove 202, thereby reducing the production difficulty of the battery cell 102 and improving the production efficiency of the battery cell 102.

[0363] Meanwhile, since the second receiving tank 202 is connected to the receiving cavity 13 through the through hole 210, the second receiving tank 202 can also serve as a buffer and temporary storage structure for the electrolyte, allowing the receiving cavity 13 to hold more electrolyte. Since the battery cell 102 loses electrolyte during charging and discharging, more electrolyte can extend the service life of the battery cell 102. Also, because the second receiving tank 202 is connected to the receiving cavity 13 through the through hole 210, the second receiving tank 202 can also serve as a receiving and buffering structure for gas generated inside the electrode assembly 31, reducing the expansion of the battery cell 102 and improving the reliability and stability of the battery cell 102.

[0364] Please refer to Figures 56-59. Figure 56 is a structural cross-sectional view of the battery cell 102 in some other embodiments of this application; Figure 57 is a partially enlarged view of the battery cell 102 shown in Figure 56; Figure 58 is a structural cross-sectional view of the battery cell 102 in some further embodiments of this application.

[0365] Figure 59 is a partially enlarged view of the battery cell 102 shown in Figure 58. The housing component 1 includes a housing body 11 with an opening 113 and a housing cover 12, the housing cover 12 covering the opening 113. The mounting wall 111 includes a wall of the housing body 11 opposite to the opening 113. That is, the terminal post 2 is mounted on the wall of the housing body 11 opposite to the opening 113.

[0366] In this embodiment, the electrode post 2 and the mounting wall 111 are located on the same side of the electrode post 3. That is, the electrode post 2 is located on the side where the mounting wall 111 is located, so that the electrode post 2 can be installed in the mounting hole 112 of the mounting wall 111. For example, when the mounting wall 111 is above the electrode post 3, the electrode post 2 is also above the electrode post 3; when the mounting wall 111 is below the electrode post 3, the electrode post 2 is also below the electrode post 3; when the mounting wall 111 is on the side of the electrode post 3, the electrode post 2 is also on the same side of the electrode post 3.

[0367] For example, the housing component 1 can be surrounded by multiple walls facing different directions, one of which is a mounting wall 111. A plane perpendicular to the through direction of the mounting hole 112 is used as the projection plane. The orthographic projection of the mounting hole 112 on this projection plane falls entirely within the range of the orthographic projection of the mounting wall 111 on the same projection plane, and the orthographic projection area of ​​the mounting hole 112 is smaller than the orthographic projection area of ​​the mounting wall 111. One or more mounting holes 112 can be provided on the mounting wall 111 to meet the installation requirements of one or more pole post components 2.

[0368] Please refer to Figures 60-63. Figure 60 is a schematic structural diagram of the battery cell 102 according to some embodiments of this application; Figure 61 is an exploded view of the battery cell 102 shown in Figure 60; Figure 62 is a cross-sectional view of the battery cell 102 shown in Figure 60; and Figure 63 is a partially enlarged view of the battery cell 102 shown in Figure 62. The housing component 1 includes a housing body 11 with an opening 113 and a housing cover 12, the housing cover 12 covering the opening 113, and the mounting wall 111 including the housing cover 12. That is, the terminal component 2 is mounted on the housing cover 12.

[0369] The shell 11 is also provided with a support plate 15, which is located between the wall of the shell 11 and the cover 12 and the electrode component 3 to support and protect the electrode component 3.

[0370] In the above technical solution, the pole component 2 can be provided on the wall of the housing 11 opposite to the opening 113, or the pole component 2 can be provided on the housing cover 12, so that the pole component 2 can be flexibly set.

[0371] Below, some specific embodiments according to this application are described.

[0372] Example 1

[0373] Referring to Figure 64, the housing component 1 has a receiving cavity 13 and includes a shell body 11 that forms the receiving cavity 13. One end of the shell body 11 has an opening 113, and the end of the shell body 11 opposite to the opening 113 is a mounting wall 111 with a mounting hole 112. The electrode component 2 is mounted on the mounting wall 111 and covers the mounting hole 112. The electrode component 3 includes a plurality of stacked electrode assemblies 31 to have an active material coating portion 32 received in the receiving cavity 13, and an electrode tab 335 connected to the active material coating portion 32. The electrode tab 335 is connected to the electrode component 2. The electrode component 2 includes an electrode body 21, a transition structure 22, and an insulating structure 23. The transition structure 22 surrounds the electrode body 21, and the insulating structure 23 is insulatingly fitted between the electrode body 21 and the transition structure 22. The transition structure 22 is connected to the mounting wall 111, and the electrode body 21 is connected to the electrode tab 335.

[0374] Referring to Figure 64, when assembling the battery cell 102, multiple electrode assemblies 31 are stacked along the thickness direction of the electrode assembly 31 (e.g., the fourth direction F4 shown in the figure). Multiple electrode assemblies 31 are stacked and connected with the same polarity of the multilayer tabs 311 to form a gathering part 313. Then, the gathering part 313 is connected to the electrode post body 21. The electrode component 3 is installed into the housing 11 with the tabs 335 facing the active material coating part 32 toward the mounting hole 112. As the electrode component 3 is installed into the housing 11, the gathering part 313 passes through to the outside of the mounting hole 112. The gathering part 313 is connected to the electrode post component 2 placed on the outside of the mounting wall 111 on the outside of the mounting wall 111. Then, the electrode post component 2 connected with the gathering part 313 covers the mounting hole 112 from the outside of the mounting wall 111. Finally, the adapter structure 22 is welded and fixed to the mounting wall 111.

[0375] The welding position of the electrode component 2 and the retractable part 313 is located outside the housing 11, which can improve the problem of conductive debris formed during the welding process entering the housing 11 and causing damage to the electrode component 3.

[0376] Example 2

[0377] Referring to Figure 65, the housing component 1 has a receiving cavity 13 and includes a shell body 11 that forms the receiving cavity 13. One end of the shell body 11 has an opening 113, and the end of the shell body 11 opposite to the opening 113 is a mounting wall 111 with a mounting hole 112. The electrode component 2 is mounted on the mounting wall 111 and covers the mounting hole 112. The electrode component 3 includes a plurality of stacked electrode assemblies 31 to have an active material coating portion 32 received in the receiving cavity 13, and an electrode tab 335 connected to the active material coating portion 32. The electrode tab 335 is connected to the electrode component 2. The electrode component 2 includes an electrode body 21, a transition structure 22, and an insulating structure 23. The transition structure 22 surrounds the electrode body 21, and the insulating structure 23 is insulatingly fitted between the electrode body 21 and the transition structure 22. The transition structure 22 is connected to the mounting wall 111, and the electrode body 21 is connected to the electrode tab 335.

[0378] Referring to Figure 65, when assembling the battery cell 102, multiple electrode assemblies 31 are stacked along the thickness direction of the electrode assembly 31 (e.g., the fourth direction F4 shown in the figure). The multiple electrode assemblies 31 are stacked and connected with multilayer tabs 311 of the same polarity to form a gathering part 313. Then, the gathering part 313 is connected to the electrode post body 21. The electrode component 3 and the electrode post component 2 connected to the gathering part 313 are installed into the housing 11 according to the direction of the electrode post component 2 relative to the active material coating part 32 toward the mounting hole 112. As the electrode component 3 is installed into the housing 11, the electrode post component 2 passes through the mounting hole 112 to the outside of the mounting wall 111. Then, the electrode post component 2 connected to the gathering part 313 covers the mounting hole 112 from the outside of the mounting wall 111. After that, the adapter structure 22 is welded and fixed to the mounting wall 111.

[0379] When the electrode component 2 is welded to the retractable part 313, it is not yet installed in the housing 11, which can improve the problem of conductive debris formed during the welding process entering the housing 11 and causing damage to the electrode component 3.

[0380] Example 3

[0381] Referring to Figure 66, the housing component 1 has a receiving cavity 13 and includes a shell body 11 that forms the receiving cavity 13. One end of the shell body 11 has an opening 113, and the end of the shell body 11 opposite to the opening 113 is a mounting wall 111 with a mounting hole 112. The electrode component 2 is mounted on the mounting wall 111 and covers the mounting hole 112. The electrode component 3 includes a plurality of stacked electrode assemblies 31 to have an active material coating portion 32 received in the receiving cavity 13, and an electrode tab 335 connected to the active material coating portion 32. The electrode tab 335 is connected to the electrode component 2. The electrode component 2 includes an electrode body 21, a transition structure 22, and an insulating structure 23. The transition structure 22 surrounds the electrode body 21, and the insulating structure 23 is insulatingly fitted between the electrode body 21 and the transition structure 22. The transition structure 22 is connected to the mounting wall 111, and the electrode body 21 is connected to the electrode tab 335.

[0382] Referring to Figure 66, when assembling the battery cell 102, multiple electrode assemblies 31 are stacked along the thickness direction of the electrode assembly 31 (e.g., the fourth direction F4 shown in the figure). The multiple electrode assemblies 31 are stacked and connected with multilayer tabs 311 of the same polarity to form a gathering part 313. Then, the gathering part 313 is connected to the electrode post body 21. The electrode component 3 and the electrode post component 2 connected to the gathering part 313 are installed into the housing 11 according to the direction of the electrode post component 2 relative to the active material coating part 32 toward the mounting hole 112. Then, the mounting hole 112 is covered by the electrode post component 2 from the inside of the mounting wall 111. After that, the adapter structure 22 is welded and fixed to the mounting wall 111.

[0383] When the electrode component 2 is welded to the retractable part 313, it is not yet installed in the housing 11, which can improve the problem of conductive debris formed during the welding process entering the housing 11 and causing damage to the electrode component 3.

[0384] Example 4

[0385] Referring to Figure 67, the housing component 1 has a receiving cavity 13 and includes a shell body 11 that forms the receiving cavity 13. One end of the shell body 11 has an opening 113, and the end of the shell body 11 opposite to the opening 113 is a mounting wall 111 with a mounting hole 112. The electrode post component 2 is mounted on the mounting wall 111 and seals the mounting hole 112. The electrode component 3 includes a plurality of stacked electrode assemblies 31 to have an active material coating portion 32 received in the receiving cavity 13, and electrode tabs 335 connected to the active material coating portion 32. The electrode tabs 335 are connected to the electrode post component 2. The electrode component 2 includes an electrode body 21 and an insulating sealing component 24. The electrode body 21 includes a first electrode member 21a and a second electrode member 21b. The second electrode member 21b defines a mating hole 21b1. The first electrode member 21a is located on the side of the second electrode member 21b away from the electrode component 3 and covers the mating hole 21b1. The second electrode member 21b is connected to the mounting wall 111, and the first electrode member 21a is connected to the electrode tab 335.

[0386] Referring to Figure 67, during the assembly of the battery cell 102, multiple electrode assemblies 31 are stacked along the thickness direction of the electrode assembly 31 (e.g., the fourth direction F4 shown in the figure). Multiple electrode assemblies 31 are stacked and connected with multilayer tabs 311 of the same polarity to form a converged portion 313. Then, the converged portion 313 is connected to the first terminal post 21a, and the second terminal post 21b is riveted to the mounting wall 111. An insulating sealing component 24 is held between the second terminal post 21b and the mounting wall 111. Subsequently, the electrode component 3 and the first electrode component 21a connected to the gathering part 313 can be installed into the housing 11 with the first electrode component 21a facing the active material coating part 32 toward the mounting hole 112. As the electrode component 3 is installed into the housing 11, the first electrode component 21a passes through the mating hole 21b1 to the outside of the mounting wall 111. Then, the first electrode component 21a connected to the gathering part 313 covers the mating hole 21b1 from the outside of the mounting wall 111. After that, the first electrode component 21a and the second electrode component 21b are welded and fixed.

[0387] When the retractable part 313 is welded to the first electrode post 21a, it has not yet been installed in the housing 11, which can improve the problem of conductive debris formed during the welding process entering the housing 11 and causing damage to the electrode component 3.

[0388] Example 5

[0389] Referring to Figure 68, the difference between Embodiment 5 and Embodiment 4 is that: after passing the gathering part 313 through the mating hole 21b1, the gathering part 313 and the first pole piece 21a are welded together. This will not be described in detail here.

[0390] It is worth noting that the above embodiments one to five are intended to illustrate the processing sequence of the battery cell 102, but the specific composition of the electrode cell 102 is not limited. For example, in the above embodiments one to five, the tab 335 and the terminal component 2 can be directly connected, or they can be connected through the conductive component 336 of the present application. For another example, in the above embodiments one to three, the form of the adapter structure 22 of the terminal component 2 is not limited, the form of the insulation structure 23 is not limited, and the shape of the terminal body 21 is not limited. All can refer to any of the above embodiments of the present application, and will not be elaborated here.

[0391] According to some embodiments of this application, this application also provides a battery 100, including a battery cell 102 of any of the above solutions.

[0392] In the technical solution of this application embodiment, by using the above-mentioned battery cell 102, the risk of failure of the active material coating part 32 itself can be reduced, the risk of leakage can be reduced, and the risk of short circuit of the battery cell 102 can also be reduced, thereby improving the reliability and stability of the battery cell 102, and thus improving the reliability of the battery 100.

[0393] For example, the battery 100 may further include a busbar, and multiple battery cells 102, at least two of which are electrically connected through the busbar. This allows for the series and / or parallel connection of multiple battery cells 102. For instance, when multiple battery cells 102 are connected in series, the anode terminal 2 of one battery cell 102 is connected to the cathode terminal 2 of the next battery cell 102 through a busbar, while the cathode terminal 2 of the same battery cell 102 is connected to the anode terminal 2 of the previous battery cell 102 through another busbar.

[0394] For example, referring to FIG2, the battery 100 includes a housing 101, and multiple battery cells 102 are housed in the housing 101. The bottom of the housing 101 is a housing bottom plate 1013. The terminal post 2 is disposed on the side of the housing component 1 facing the housing bottom plate 1013, or on the side of the housing component 1 away from the housing bottom plate 1013.

[0395] During the use of the battery 100, such as in vehicle use, the bottom plate 1013 of the housing is located at the bottom of the housing 101 in the direction of gravity. Thus, when the terminal component 2 is located on the side of the housing component 1 facing the bottom plate 1013, it means that the terminal component 2 is located at the bottom of the housing component 1 in the direction of gravity. At this time, the battery cell 102 is in an inverted state, and the depressurized products are ejected in the direction away from the passenger compartment, which is safer. When the terminal component 2 is located on the side of the housing component 1 away from the bottom plate 1013, it means that the terminal component 2 is located at the top of the housing component 1 in the direction of gravity. At this time, the battery cell 102 is in an upright state, and the electrolyte is not easy to leak. Therefore, the orientation of the battery cell 102 and the housing 101 can be flexibly set.

[0396] According to some embodiments of this application, this application also provides an electrical device, which includes the battery cell 102 described in the above scheme, or includes the battery 100 described in the above scheme, and the battery 100 is used to provide electrical energy to the electrical device.

[0397] The electrical device can be any of the aforementioned devices or systems that use battery 100.

[0398] In the technical solution of this application embodiment, by using the above-mentioned battery cell 102 or battery 100, the reliability of the electrical device can be improved.

[0399] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, wherein, include: The housing component defines a receiving cavity and includes a mounting wall; An electrode component is mounted on the mounting wall and includes an electrode body; An electrode component is housed in the receiving cavity and includes an active material coating portion, a conductive portion, and an insulating member. The conductive portion connects the active material coating portion and the electrode body. At least a portion of the insulating member is disposed between the end of the active material coating portion connected to the conductive portion and the electrode body. The insulating member has a clearance hole for the conductive portion to pass through. The insulating member blocks the portion of the conductive portion that passes through the insulating member and connects to the electrode body from the portion of the active material coating portion.

2. The battery cell according to claim 1, wherein, The clearance hole includes a first clearance hole, and the insulating member includes: An insulating film is provided, which fully covers the active material coating portion. The first clearance hole is opened at a position opposite to the mounting wall of the insulating film and is adapted to the thickness of the conductive portion. The peripheral wall of the insulating film forming the first clearance hole blocks the portion of the conductive portion that passes through the first clearance hole and connects to the electrode body, and the active material coating portion.

3. The battery cell according to claim 2, wherein, The first clearance hole is a normally open hole adapted to the thickness of the conductive part.

4. The battery cell according to claim 2, wherein, The insulating film is provided with a tearing structure at the position opposite to the mounting wall. The tearing structure is adapted to be torn by the conductive part to form the first clearance hole adapted to the thickness of the conductive part.

5. The battery cell according to claim 4, wherein, The tearing structure includes: The first tear portion extends along the length direction of the pole body; The second tear-off portion extends at an angle to the length direction of the pole body, and the end of the first tear-off portion is connected to the second tear-off portion.

6. The battery cell according to claim 5, wherein, The end of the first tear portion is connected to the middle of the second tear portion; and / or, there are two second tear portions, which are spaced apart and connected to both ends of the first tear portion respectively; and / or, the second tear portion extends along the width direction of the pole body.

7. The battery cell according to any one of claims 2-5, wherein, The insulating film comprises: The main insulating part is wrapped around the periphery of the active material coated part; A first insulating part and a second insulating part are respectively disposed at both ends of the main insulating part. The first insulating part is located on the side of the main insulating part near the mounting wall and wraps around the end of the active material coating part near the mounting wall. The second insulating part is located on the side of the main insulating part away from the mounting wall and wraps around the end of the active material coating part away from the mounting wall. The first clearance hole is located in the first insulating part.

8. The battery cell according to any one of claims 2-6, wherein, A retaining piece is connected to at least a portion of the circumferential region of the insulating film around the first clearance hole, and the hardness of the retaining piece is greater than that of the insulating film.

9. The battery cell according to any one of claims 2-7, wherein, The clearance hole includes a second clearance hole disposed opposite to the first clearance hole, and the insulating member further includes: An insulating support includes a support body disposed at one end of the active material coating portion near the mounting wall and covering at least a portion of the insulating film on the end of the active material coating portion facing the mounting wall. A second clearance hole is formed in the support body. A conductive portion passes through the first clearance hole and is connected to the pole body either in or through the second clearance hole.

10. The battery cell according to claim 9, wherein, The second clearance hole has a first hole wall and a second hole wall disposed opposite to each other in the width direction of the pole body, and the insulating support further includes: A first separator is disposed on the wall of the first hole and connected to the support body. The first separator extends toward the center of the second clearance hole and blocks the portion where the conductive part is connected to the electrode body and the active material coating part.

11. The battery cell according to claim 10, wherein, The insulating support also includes: The second partition is disposed at the second hole wall and connected to the support body. The second partition extends toward the center of the second clearance hole and is spaced apart from the first partition, forming a through hole communicating with the second clearance hole. The conductive part passes through the through hole. The first partition and the second partition block the portion of the conductive part that passes through the through hole and connects to the electrode body on both sides and between the active material coating portion.

12. The battery cell according to claim 1, wherein, The battery cell includes an insulating film that covers the active material coating portion, and the insulating film at one end facing the mounting wall has a through hole that exposes the conductive portion; The insulating element is an insulating support, which is disposed at one end of the active material coating portion near the mounting wall and covers at least a portion of the insulating film on the end of the active material coating portion facing the mounting wall. The clearance hole is opened in the insulating support, and the conductive portion passes through the through hole and the clearance hole to connect with the pole body.

13. The battery cell according to claim 12, wherein, The insulating support is positioned between the portion of the conductive part that passes through the clearance hole and connects to the electrode body on both sides, and between the active material coating portion and the conductive part.

14. The battery cell according to any one of claims 1-10, wherein, The conductive part includes a converging section, a first extension section and a second extension section arranged in its extending direction. The converging section is connected to the active material coating part, the second extension section is connected to the electrode body, and the two ends of the first extension section are respectively connected to the converging section and the second extension section. The first extension section passes through the clearance hole, and the approaching section and the second extension section are located on both sides of the insulating member, respectively.

15. The battery cell according to claim 14, wherein, The conductive part includes a plurality of stacked tabs, and the plurality of tabs are close together near the root of the active material coating part to form a triangular close-up segment. The plurality of tabs are brought together and connected at a position on the approaching section away from the active material coating to form the first extension section and the second extension section.

16. The battery cell according to claim 14, wherein, The first end of the first extension is connected to the abutting section via a first bend, and the three define a first opening groove. The second end of the first extension is connected to the second extension via a second bend, and the three define a second opening groove. The openings of the first opening groove and the second opening groove face different directions and are spaced apart in the thickness direction of the mounting wall. The insulating member extends at least partially into the first opening groove to block the first extension and the active material coating.

17. The battery cell according to claim 16, wherein, The insulating element extends at least partially toward the direction of the second opening groove to block the space between the second extension and the active material coating.

18. The battery cell according to claim 16, wherein, The approaching section, the first extension section, and the second extension section define a third opening groove, and the insulating member extends at least partially into the third opening groove to block the second extension section from the active material coating portion.

19. The battery cell according to any one of claims 14-18, wherein, The conductive part includes a tab, which includes a plurality of stacked tab pieces, and the converging section, the first extension section and the second extension section are formed by different parts of the tab.

20. The battery cell according to any one of claims 14-18, wherein, The conductive part includes: A tab is connected to one end of the active material coating near the mounting wall, and the tab includes a plurality of stacked tab pieces; A conductive element is connected between the tab and the post body, a portion of the conductive element forming the second extension and another portion forming at least a portion of the first extension, and at least a portion of the tab forming the abutment section.

21. The battery cell according to claim 20, wherein, The conductive component also includes an adapter piece, which comprises multiple stacked and connected adapter foils to make the adapter piece deformable.

22. The battery cell according to any one of claims 1-21, wherein, The pole component further includes a transition structure and an insulation structure. The transition structure surrounds the pole body and is connected to the mounting wall. The insulation structure is insulated and sealed between the transition structure and the pole body.

23. The battery cell according to claim 22, wherein, The adapter structure is formed as an elongated strip extending along the length of the mounting wall, and the outline shape of the pole body matches the outline shape of the adapter structure. Alternatively, the adapter structure may be formed as an elongated strip extending along the length of the mounting wall, with the pole body located at the center of the length of the adapter structure and being circular.

24. The battery cell according to claim 22, wherein, The insulating structure includes a sealing structure member, which is circumferentially disposed on the side of the adapter structure facing the pole body and is at least partially clamped between the adapter structure and the pole body in the inward and outward directions of the mounting wall.

25. The battery cell according to claim 22, wherein, The mounting wall has mounting holes, the pole component covers the mounting holes, and the edge of the transition structure overlaps one side of the mounting wall in the wall thickness direction.

26. The battery cell according to claim 25, wherein, The edge of the adapter structure overlaps with the side of the mounting wall away from the electrode component. The mounting wall has a first recessed groove surrounding the mounting hole. The first recessed groove opens in the direction away from the electrode component. The edge of the adapter structure has a flange portion embedded in the first recessed groove.

27. The battery cell according to claim 25 or 26, wherein, The edge of the adapter structure overlaps with the side of the mounting wall opposite to the electrode component. The mounting hole is an elongated hole, and the pole component is formed into an elongated structure that matches the shape of the mounting hole.

28. The battery cell according to claim 25, wherein, The edge of the adapter structure overlaps with the side of the mounting wall facing the electrode component. The edge of the adapter structure has a second recessed groove that opens in a direction away from the electrode component. The mounting wall includes an overlapping portion protruding into the mounting hole, and the overlapping portion is embedded in the second recessed groove.

29. The battery cell according to claim 22, wherein, The electrode post component forms a first receiving groove that is recessed relative to the mounting wall in a direction away from the electrode component and open in a direction towards the electrode component. The electrode component is connected to the electrode post component through a conductive part. At least a portion of the conductive part is received in the first receiving groove and connected to the electrode post body.

30. The battery cell according to claim 22, wherein, The electrode body has a second receiving groove, which is open to the opposite side of the receiving cavity, and the bottom wall of the second receiving groove is provided with a through hole. The conductive part passes through the through hole and is at least partially received in the second receiving groove.

31. The battery cell according to any one of claims 1-30, wherein, The housing component includes a housing body with an opening and a housing cover, the housing cover being closed to the opening; the mounting wall includes a wall body disposed opposite to the opening, and / or the mounting wall includes the housing cover.

32. A battery, wherein, Includes the battery cell according to any one of claims 1-31.

33. The battery according to claim 32, wherein, The battery includes a housing, and the battery cells are multiple and housed in the housing. The bottom of the housing is a housing bottom plate. The terminal post is located on the side of the housing component facing the housing bottom plate, or on the side of the housing component away from the housing bottom plate.

34. An electrical appliance, wherein, It includes the battery cell according to any one of claims 1-31; or, it includes the battery according to any one of claims 32 to 33.

Images