Battery cell, battery and electric device

Abstract

The utility model discloses a battery monomer, a battery and a power utilization device. The battery monomer comprises a shell part, a pole part and an electrode part, and the shell part defines a containing cavity and comprises a mounting wall; the pole component is mounted on the mounting wall and comprises a pole body; the electrode part is accommodated in the accommodating cavity and comprises an active material coating part and a conductive part; the conductive part is connected between the active material coating part and the pole body; the conductive part is bent to form at least two open slots, the openings of the two open slots face different directions, and the two open slots are arranged at intervals in the thickness direction of the mounting wall. In the technical scheme of the embodiment of the invention, the conductive part can play a better buffering role, the risk of short circuit of the battery monomer can be reduced, mutual interference and rubbing between the tab pieces in the conductive part are improved, and the reliability of the battery monomer is improved.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a battery cell, a battery, and an electrical device. Background Art

[0002] Energy conservation and emission reduction are 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 advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] In the related art, the connection reliability between the pole and the lug needs to be further improved, so that the reliability of the battery also needs to be further improved. Utility Model Content

[0004] In view of the above problems, the present application provides a battery cell, a battery, and an electrical device, which can utilize a conductive portion for buffering to improve reliability of use.

[0005] In the first aspect, the present application provides a battery cell, including a shell component, a pole component and an electrode component, the shell component defines a accommodating cavity, and the shell component includes a mounting wall; the pole component is mounted on the mounting wall, and the pole component includes a pole body; the electrode component is accommodated in the accommodating cavity, and the electrode component includes an active material coating portion and a conductive portion, and the conductive portion connects the active material coating portion and the pole body; wherein the conductive portion is bent to form at least two open grooves, the openings of the two open grooves face different directions, and are arranged at intervals in the thickness direction of the mounting wall.

[0006] In the technical solution of the embodiment of the present application, by bending the conductive part to form the above-mentioned shape, on the one hand, the conductive part can play a better buffering role, and when the battery cell is used in a vibration environment, it can absorb vibration, protect the electrode components, and improve the reliability of the battery cell. On the other hand, through the setting of two open grooves, the conductive part is bent regularly, and the bent part is not easy to be inserted into the active material coating part due to redundancy, thereby reducing the risk of short circuit in the battery cell, and can also improve the mutual interference and scratching between the pole ear sheets in the conductive part, reduce lithium plating, and further improve the reliability of the battery cell.

[0007] In some embodiments, one end of the conductive part is directly connected to the active material coating part, and the other end is directly connected to the pole body. This arrangement can simplify the structure of the battery cell and improve the production efficiency of the battery cell.

[0008] In some embodiments, the conductive portion includes a closing segment, a first extension segment and a second extension segment arranged in its extension direction, the closing segment is connected to the active material coating portion, the second extension segment is connected to the pole body, the first end of the first extension segment is connected to the closing segment through a first bending portion, and the first side of the first extension segment forms an open groove with the first bending portion and the closing segment, the other end of the first extension segment is connected to the second extension segment through the second bending portion, and the second side of the first extension segment opposite to the first side forms another open groove with the second bending portion and the second extension segment.

[0009] In the above technical solution, by making the conductive part roughly in an "S" shape, the conductive part can play a better buffering role, and can also improve the mutual interference and scratching between the pole tabs in the conductive part, thereby further improving the reliability of the battery cell.

[0010] In some embodiments, the first bend is arranged in the center of the width direction of the pole body; or the first bend is on one side of the center position in the width direction of the pole body, and the second bend is on the other side of the center position in the width direction of the pole body. In this way, the first bend and the second bend can be arranged in the width direction of the pole, so that the conductive part can be arranged in a roughly "S" shape, thereby meeting the design requirements.

[0011] In some embodiments, the conductive portion includes a plurality of stacked tabs, and the plurality of tabs are close to each other at the root of the active material coating portion to form a triangular close segment. In the above technical solution, the plurality of tabs are close to each other at the root of the active material coating portion to form a triangular close segment, so that the plurality of tabs can be stacked and formed into a whole that is not easy to loosen, thereby facilitating the connection between the conductive portion and the pole body.

[0012] In some embodiments, the conductive portion includes a plurality of stacked pole tabs, and the plurality of pole tabs are connected at one end of the first bending portion away from the approaching section to form a first connection portion. Connecting one end of the first bending portion away from the approaching section to form the first connection portion can connect together a plurality of pole tabs that are originally stacked and are prone to loosening, and the plurality of pole tabs are not likely to loosen at the first connection portion, which can reduce the possibility of the plurality of pole tabs being inserted into the active material coating portion due to bifurcation of the pole tabs after the plurality of pole tabs are bent, thereby reducing the risk of short circuit of the battery cell and improving the reliability of the battery cell.

[0013] In some embodiments, when the conductive part is in a straightened state, the distance between the first connection part and the end of the active material coating part close to the mounting wall is less than or equal to 2.5 mm. In the above technical solution, by limiting the distance between the first connection part and the end of the active material coating part close to the mounting wall to meet the above range, the problem of multiple tabs becoming loose after the conductive part is bent can be reduced, and the possibility of the tab bifurcating and causing the active material coating part to be inserted upside down can be reduced, thereby reducing the risk of short circuit of the battery cell, which is conducive to improving the reliability of the battery cell.

[0014] In some embodiments, an insulating bracket is provided between the end where the active material coating part is connected to the conductive part and the mounting wall, the insulating bracket has a through hole, the conductive part is provided through the through hole and connected to the pole body; wherein the through hole has a first hole edge at one end close to the active material coating part and a second hole edge at one end close to the pole body, and the distance between the first connection part and the active material coating part is greater than the distance between the first hole edge and the active material coating part. When the battery cell is placed vertically, the first connection part is higher than the first edge of the through hole, so that the connection position of the multiple pole tabs at the end of the first bend away from the close section is higher than the lowest edge of the through hole, further reducing the possibility of the conductive part becoming loose, which is more conducive to improving the reliability of the battery cell.

[0015] In some embodiments, a plurality of pole tabs are connected at one end of the second bending portion close to the second extension section to form a second connection section. Connecting one end of the second bending portion close to the second extension section to form the second connection section can connect a plurality of pole tabs that are originally stacked and easily loose together, and the plurality of pole tabs are not easy to loosen at the second connection section. This can reduce the possibility of the plurality of pole tabs being inserted into the active material coating portion due to bifurcation of the pole tabs after the plurality of pole tabs are bent, and facilitate the connection between the second extension section and the pole body.

[0016] In some embodiments, when the conductive part is in a straightened state, the distance between the first connection part and the second connection part is less than or equal to 16 mm, and the distance between the second connection part and one end of the second extension section away from the active material coating part is greater than or equal to 8 mm. In the above technical solution, by limiting the distance between the first connection part and the second connection part to meet the above range, on the one hand, the problem of multiple tabs becoming loose after the conductive part is bent can be reduced, and the possibility of the tabs bifurcating and causing the active material coating part to be inserted upside down can be reduced. On the other hand, after the conductive part is bent, the second connection part can be located between the pole body and the second edge of the perforation in the thickness direction of the mounting wall, thereby reducing the assembly space between the pole body and the active material coating part, making the structure of the battery cell more compact.

[0017] In some embodiments, the conductive portion includes a tab, the tab includes a plurality of tab sheets stacked, and the close 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, so the adapter sheet can be omitted, and the connection step between the adapter sheet and the tab is omitted, which is conducive to improving the production efficiency of the battery cell.

[0018] In some embodiments, a plurality of pole tabs are brought together and connected at a position away from the active material coating portion in the close section to form a first extension section and a second extension section; a plurality of pole tabs are connected at the second extension section to form a third connection section, and the third connection section is a long strip extending along the length direction of the pole body, and the third connection section is centered in the width direction of the pole body. In the above technical solution, by arranging the third connection section in the center in the width direction of the pole body, on the one hand, the size requirements for the second extension section can be reduced, thereby reducing the difficulty of connecting the conductive part with the pole body, and on the other hand, the conductive part can be bent to move closer to the center position between the pole body and the active material coating portion, so that the shape of the conductive part after bending can be controlled.

[0019] In some embodiments, the conductive part includes: a pole ear connected to one end of the active material coating part close to the mounting wall, and the pole ear includes a plurality of pole ear sheets stacked; a conductive member connected between the pole ear and the pole body, a portion of the conductive member forming a second extension segment and another portion forming at least a portion of the first extension segment, and at least a portion of the pole ear forming a close segment. Thus, by indirectly connecting the pole ear and the pole body through the conductive member, the length of the pole ear can be shortened, and the problems of wrinkling, bending and breaking of the pole ear sheet can be improved. Moreover, by flexibly designing the shape and material of the conductive member, the difficulty of connection with the pole body can be reduced, and the convenience of connection between the conductive member and the pole body can be improved. In addition, the perforation operation of the pole ear, the connection operation between the pole ear and the pole component (which may not be required), and the connection operation between the pole component and the shell component are not likely to cause cracking at the connection position between the active material coating part and the conductive part, thereby improving the reliability of the battery cell.

[0020] In some embodiments, the conductive member has a slot, and the tab is at least partially inserted into the slot. In this way, the two clamping parts can be used to limit the end of the tab away from the active material coating part (referred to as the tab end), thereby improving the connection reliability between the tab and the conductive member.

[0021] In some embodiments, the conductive member includes a transfer sheet, and the transfer sheet includes a plurality of transfer foils stacked and connected so that the transfer sheet can be deformed. Since the thickness of the plurality of transfer foils is small, the plurality of transfer foils are equivalent to a multi-layer thin plate, and the transfer sheet formed by the plurality of transfer foils is easier to bend than the integrally formed transfer sheet, so that the transfer sheet and the tab can be bent as needed, so that the conductive part forms a preset "S" shape, thereby meeting the design requirements.

[0022] In some embodiments, the electrode component further includes: an insulating member, the insulating member is at least partially disposed between the end portion where the active material coating portion is connected to the conductive portion and the pole body, the insulating member is provided with an avoidance hole for the conductive portion to pass through, and the insulating member is blocked between the portion where the conductive portion passes through the insulating member and is connected to the pole body and the active material coating portion. In the above technical solution, by providing the insulating member, an insulating effect can be played. On the one hand, the active material coating portion can be isolated from the mounting wall of the shell component, and the probability of the active material coating portion contacting the mounting wall of the shell component can be reduced, thereby reducing the risk of the mounting wall of the shell component being corroded due to naked leakage of the active material coating portion, reducing the risk of failure of the active material coating portion itself, and reducing the risk of leakage, thereby improving the reliability and stability of the battery cell, and on the other hand, the portion where the conductive portion passes through the insulating member can be isolated from the active material coating portion, reducing the probability of the conductive portion being inserted into the active material coating portion due to redundancy, thereby reducing the risk of short circuit of the battery cell, which is conducive to improving the reliability of the battery cell.

[0023] In some embodiments, the avoidance hole includes a first avoidance hole, and the insulating part includes: an insulating film, the insulating film completely covers the active material coating part, the first avoidance hole is opened at a position opposite to the insulating film and the mounting wall, and is adapted to the thickness of the conductive part, and the insulating film forms a surrounding wall of the first avoidance hole to block between the first extension section and the active material coating part, and between the second extension section and the active material coating part. In the above technical scheme, by making the size of the first avoidance hole match the thickness of the conductive part, on the one hand, the first avoidance hole allows the conductive part to pass through the insulating film, so that the conductive part can be electrically connected to the pole body of the pole component, and on the other hand, when the conductive part is inserted into the first avoidance hole, the insulating film can also cover the approaching section of the conductive part, further realizing insulation protection for the active material coating part and reducing the risk of bare leakage of the active material coating part. Insulation protection can also be realized for the approaching section of the conductive part, so that the first extension section and the second extension section are separated from the approaching section, so that the insulating film at least partially blocks the first extension section and the active material coating part, and the second extension section and the active material coating part. Even if the insulating film blocks the part where the conductive part passes through the first avoidance hole and is connected to the pole body, and between the active material coating part, the probability of the conductive part being inverted into the active material coating part and the approaching section due to redundancy is reduced, thereby reducing the risk of short circuit in the battery cell.

[0024] In some embodiments, the first avoidance hole itself is a normally open hole adapted to the thickness of the conductive part. In the above technical solution, by setting the first avoidance 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 cell, and the conductive part can avoid the insulating film during the process of passing through the insulating film, thereby reducing the probability of deformation of the conductive part and reducing the operation steps for shaping the conductive part, thereby improving the assembly efficiency of the battery cell.

[0025] In some embodiments, a tearing structure is provided at a position of the insulating film relative to the mounting wall, and the tearing structure is suitable for being torn under the action of the conductive part to form a first avoidance hole adapted to the thickness of the conductive part. In the above technical scheme, by pre-arranging a tearing structure on the insulating film, a first avoidance hole that can be opened and closed can be formed in the process of coating the insulating film on the outer side of the active material coating part. After the conductive part is inserted into place, the first avoidance hole can gradually tend to close, so that the insulating film can cover at least a part of the approaching section of the conductive part, thereby forming insulation protection for the approaching section of the conductive part, so that the part of the conductive part passing through the first avoidance hole is separated from the approaching section, reducing the probability of the conductive part being inserted into the interior of the active material coating part and the approaching section due to redundancy, thereby reducing the risk of short circuit of the battery cell.

[0026] In some embodiments, a retaining sheet is connected to at least a portion of the circumference of the insulating film around the first avoidance hole, and the hardness of the retaining sheet is greater than the hardness of the insulating film. In the above technical solution, by connecting and arranging the retaining sheet on the insulating film, the rigidity of the insulating film at the first avoidance hole can be increased. On the one hand, the barrier effect between the portion of the conductive part passing through the first avoidance hole and the active material coating portion can be enhanced, further reducing the probability of the conductive part being inverted into the active material coating portion. On the other hand, the close section of the conductive part can be kept in a retracted shape, further reducing the probability of the portion of the conductive part passing through the first avoidance hole being inverted into the close section of the conductive part, thereby greatly reducing the risk of short circuit in the battery cell.

[0027] In some embodiments, the avoidance hole includes a second avoidance hole arranged opposite to the first avoidance hole, and the insulating member further includes: an insulating bracket, the insulating bracket includes a bracket body, the bracket body is arranged at one end of the active material coating part close to the mounting wall, and covers at least a portion of the insulating film on the end of the active material coating part facing the mounting wall, the second avoidance hole is opened in the bracket body, the conductive part passes through the first avoidance hole, and passes through the second avoidance hole or from the second avoidance hole to connect with the pole body. In the above technical solution, the bracket body can support the active material coating part, and can also isolate the active material coating part from the mounting wall of the shell component, reduce the probability of the active material coating part contacting the mounting wall, thereby reducing the risk of the active material coating part corroding the mounting wall of the shell component due to naked leakage, reducing the risk of leakage, and then improving the reliability and stability of the battery cell.

[0028] In some embodiments, the second avoidance hole has a first hole wall and a second hole wall that are relatively arranged in the width direction of the pole body, and the insulating bracket also includes: a first separator, the first separator is arranged at the first hole wall and is connected to the bracket body, the first separator extends in a direction close to the center of the second avoidance hole, the first separator is blocked between the first extension section and the approach section, and abuts against the first extension section and / or the approach section.

[0029] In the above technical scheme, an insulating bracket is provided at one end of the active material coating portion close to the mounting wall, and the conductive portion can be shaped by using the first separator of the insulating bracket so that the conductive portion can maintain a preset "S" shape, and can also block between the first extension section and the approaching section, that is, between the first extension section and the active material coating portion, and between the second extension section and the active material coating portion, thereby reducing the probability of the conductive portion being invertedly inserted into the active material coating portion and the approaching section due to redundancy, thereby reducing the risk of short circuit in the battery cell and helping to improve the reliability of the battery cell.

[0030] In some embodiments, the thickness of the first separator is less than the thickness of the bracket body, and the first separator is separated from the hole wall of the second avoidance hole on both sides of the length direction of the pole body, so that the first separator can be deformed under the pressure of the conductive part. In the above technical solution, by limiting the first separator to meet the above conditions, the first separator can be deformed under the action of external force (such as the pressure of the conductive part), so that the first separator can be deformed according to the approaching section, and the approaching section is pressed, so that the multiple pole tabs of the conductive part are closer together at the approaching section, so that the conductive part can maintain a preset gathering shape and cannot be dispersed.

[0031] In some embodiments, the insulating bracket also includes: a second separator, which is arranged at the second hole wall and connected to the bracket body, the second separator extends in the direction close to the center of the second avoidance hole, and is spaced from the first separator, a through hole connected to the second avoidance hole is formed between the two, the conductive part is passed through the through hole, the second separator is blocked between the second extension section and the first extension section or the approaching section, and abuts against the first extension section and / or the approaching section. In the above technical scheme, the conductive part can be shaped by the second separator of the insulating bracket so that the conductive part can maintain a preset "S" shape, and can also be blocked between the second extension section and the approaching section, that is, blocked between the second extension section and the active material coating section, thereby reducing the probability of the conductive part being inverted into the active material coating section and the approaching section due to redundancy, thereby reducing the risk of short circuit of the battery cell, which is beneficial to improving the reliability of the battery cell.

[0032] In some embodiments, the size of the perforation in the width direction of the pole body is greater than or equal to the thickness of the conductive part. In the above technical solution, by limiting the size of the perforation in the width direction of the pole body to meet the above conditions, the conductive part can smoothly pass through the perforation, reducing the scratching of the conductive part by the first separator and the second separator, thereby reducing the risk of failure and damage of the conductive part, and improving the reliability and stability of the battery cell.

[0033] In some embodiments, the pole component further includes a transition structure and an insulating structure, the transition structure surrounds the pole body and is connected to the mounting wall, and the insulating structure is insulated and sealed between the transition structure and the pole body. In the above technical solution, the pole component has a simple structure and is easy to process. Since it includes 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 requirements with different forms of shell components and electrode components, thereby increasing the scope of application of the pole component.

[0034] In some embodiments, the adapter structure is formed into a long strip extending along the length direction of the mounting wall, and the contour shape of the pole body matches the contour shape of the adapter structure; or, the adapter structure is formed into a long strip extending along the length direction of the mounting wall, and the pole body is arranged at the length center position of the adapter structure and is circular. In the above technical solution, when the contour shape of the pole body is formed into a long strip matching the contour shape of the adapter structure, the area of ​​the pole body is large, which is conducive to increasing the connection area between the conductive part and the pole body, thereby improving the conductive performance. When the pole body is arranged at the length center position of the long strip adapter structure and is circular, it is conducive to reducing the connection area between the pole body and the adapter structure, improving the force uniformity at the connection between the pole body and the adapter structure, thereby improving the connection reliability between the pole body and the adapter structure.

[0035] In some embodiments, the insulating structure includes a sealing structure, which is arranged around the peripheral side of the transition structure facing the pole body, and at least partially clamped between the transition structure and the pole body in the inner and outer directions of the mounting wall. In the above technical solution, by setting at least part of the sealing structure to be clamped between the transition structure and the pole body in the inner and outer directions of the mounting wall, an axial seal between the transition structure and the pole body is achieved. The axial seal can achieve a more reliable sealing effect, improve the leakage problem at the matching position of the transition structure and the pole body, and the embodiment of the present application can reduce the axial force on the mounting wall by integrating the axial seal into the pole component. Moreover, by arranging the sealing structure around the inner ring of the transition structure, the sealing structure can be close to the matching position of the transition structure and the pole body, which is conducive to sealing the matching position of the transition structure and the pole body in a shorter path, improving the reliability of the seal, and is conducive to reducing the size of the sealing structure, reducing the sealing area, and easily achieving compression sealing on it. The seal is not easy to fail, and the sealing effect is improved.

[0036] In some embodiments, a mounting hole is provided on the mounting wall, the pole component is covered in the mounting hole, and the edge of the adapter structure overlaps one side of the mounting wall in the wall thickness direction. In the above technical scheme, the assembly of the adapter structure and the mounting wall is facilitated, and the production efficiency is improved. When the edge of the adapter structure overlaps the side of the mounting wall away from the electrode component, it is convenient to assemble and connect the pole component and the mounting wall, which is beneficial to improve the connection reliability between the pole 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 pole component can be installed into the shell together, and the pole component does not need to pass through the mounting hole, thereby reducing the operation steps and reducing the difficulty of operation.

[0037] In some embodiments, the edge of the adapter structure overlaps the side of the mounting wall away from the electrode component, the mounting wall has a first recessed groove arranged around the mounting hole, the first recessed groove is open in a direction away from the electrode component, and 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, which is conducive to welding the two from the outside of the mounting wall.

[0038] In some embodiments, the edge of the transition structure overlaps the side of the mounting wall away from the electrode component, the mounting hole is a long strip hole, and the pole component is formed into a long strip structure that matches the shape of the mounting hole. In the above technical solution, the space required for the flipping movement of the pole component is small, which can reduce the space required for the flipping of the pole component, thereby shortening the length of the conductive part, saving materials, reducing costs, and reducing the redundancy of the conductive part, reducing the space occupied by the conductive part in the accommodating cavity, which is conducive to improving the energy density of the battery cell.

[0039] In some embodiments, the edge of the transition structure overlaps the side of the mounting wall facing the electrode component, the edge of the transition structure has a second recessed groove open in a direction away from the electrode component, the mounting wall includes an overlapped portion protruding into the mounting hole, and the overlapped portion is embedded in the second recessed groove. In the above technical solution, it is convenient to support and position the connection between the pole component and the mounting wall, which is conducive to welding the two from the outside of the mounting wall.

[0040] In some embodiments, the pole component is surrounded by a first receiving groove that is recessed relative to the mounting wall in a direction away from the electrode component and is open in the direction of the electrode component. The electrode component is connected to the pole component through a conductive portion, and at least part of the conductive portion is received in the first receiving groove and connected to the pole body. In the above technical solution, by providing the first receiving groove to receive the conductive portion, the space occupied by the conductive portion in the receiving cavity can be reduced, so that the receiving cavity has a larger space to receive the active material coating portion, which is beneficial to increase 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 in the direction of the electrode component, the conductive portion can be easily inserted into the first receiving groove, reducing the difficulty of operation.

[0041] In a second aspect, the present application provides a battery, which includes the battery cell in the above embodiment.

[0042] In the technical solution of the embodiment of the present application, by adopting the above-mentioned battery cell, when the battery is used in a vibration environment, the impact of the active material coating portion toward the installation wall can be reduced, thereby protecting the electrode components and reducing the risk of short circuit in the battery cell, thereby improving the reliability of the battery.

[0043] In some embodiments, the battery includes a box body, a plurality of battery cells are contained in the box body, the bottom of the box body is a box body bottom plate, and the pole component is arranged on the side of the shell component facing the box body bottom plate, or arranged on the side of the shell component away from the box body bottom plate. In the above technical solution, when the pole component of the battery cell is arranged on the side of the shell component facing the box body bottom plate, the battery cell is in an inverted state, and the pressure relief product is sprayed in a direction away from the passenger compartment, which is safer; when the pole component of the battery cell is arranged on the side of the shell component close to the box body bottom plate, the battery cell is in an upright state, and the electrolyte is not easy to leak; therefore, the orientation of the battery cell and the box body can be flexibly arranged.

[0044] In a third aspect, the present application provides an electrical device, which includes the battery cell in the above embodiment; or, includes the battery in the above embodiment.

[0045] In the technical solution of the embodiment of the present application, by adopting the above-mentioned battery cell or battery, the electrical device can be used in a vibration environment, thereby improving the reliability of the electrical device.

[0046] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0048] Figure 1 A schematic diagram of the structure of a vehicle according to some embodiments of the present application;

[0049] Figure 2 An exploded view of a battery according to some embodiments of the present application;

[0050] Figure 3 A schematic diagram of the structure of a battery cell in some embodiments of the present application;

[0051] Figure 4 A structural cross-sectional view of a battery cell according to some embodiments of the present application;

[0052] Figure 5 for Figure 4 A partial enlarged view of a battery cell shown in ;

[0053] Figure 6 for Figure 3 A schematic diagram of a local structure in which the conductive portion of the battery cell is in a straightened state;

[0054] Figure 7 for Figure 3 A schematic diagram of a local structure of a battery cell when the conductive portion is connected to the pole component as shown in FIG.

[0055] Figure 8 for Figure 3 A schematic diagram of a local structure of a battery cell when a pole component and a shell component are connected;

[0056] Fig. 9 The structural cross-sectional views of battery cells of other embodiments of the present application;

[0057] Fig.10 for Fig. 9 A partial enlarged view of a battery cell shown in ;

[0058] Fig.11 for Fig. 9 A schematic diagram of the local structure of the conductive part of the battery cell during shaping shown in FIG.

[0059] Fig.12 for Fig. 9 An exploded view of the structure of the conductive portion of the battery cell shown in ;

[0060] Fig.13 for Fig. 9 A schematic diagram of a local structure in which the conductive portion of the battery cell is in a straightened state;

[0061] Fig.14 for Fig. 9 A schematic diagram of the structure in which the electrode component of the battery cell shown in FIG. is installed in the housing component;

[0062] Fig.15 for Fig. 9 A schematic diagram of a local structure of a battery cell when the conductive portion is connected to the pole component as shown in FIG.

[0063] Fig.16 for Fig. 9 A schematic diagram of a local structure of a battery cell when a pole component and a shell component are connected;

[0064] Fig.17 A schematic diagram of the structure of the electrode components and the insulating film of the battery cell of some embodiments of the present application;

[0065] Fig.18 Schematic diagrams of the structures of electrode components and insulating films of battery cells in other embodiments of the present application;

[0066] Fig.19 for Fig.18 A schematic diagram of the structure of the insulating film of the battery cell shown in ;

[0067] Fig. 20 Schematic diagrams of the structures of electrode components and insulating films of battery cells in some other embodiments of the present application;

[0068] Fig.21 for Fig. 20 A top view of the structure shown in ;

[0069] Fig. 22 for Fig. 20 A cross-sectional view of the structure of the electrode component and the insulating film shown in FIG.

[0070] Fig.23 Schematic diagrams of the structures of electrode components and insulating films of battery cells in some other embodiments of the present application;

[0071] Fig.24 for Fig.23 A top view of the structure shown in ;

[0072] Fig.25 for Fig.23A cross-sectional view of the structure of the electrode component and the insulating film shown in FIG.

[0073] Fig.26 A schematic diagram of the structure of an insulating bracket of a battery cell in some embodiments of the present application;

[0074] Fig. 27 An assembly diagram of an insulating bracket and an electrode component of a battery cell according to some embodiments of the present application;

[0075] Fig.28 Another assembly diagram of an insulating bracket and an electrode component of a battery cell according to some embodiments of the present application;

[0076] Fig.29 A schematic diagram of the structure of an insulating bracket of a battery cell in some embodiments of the present application;

[0077] Fig.30 for Fig.29 A structural cross-sectional view of an insulating bracket of a battery cell shown in ;

[0078] Fig.31 An assembly diagram of an insulating bracket and an electrode component of a battery cell according to some embodiments of the present application;

[0079] Fig.32 Another assembly diagram of an insulating bracket and an electrode component of a battery cell according to some embodiments of the present application;

[0080] Fig.33 for Fig.32 An assembly diagram of the insulating bracket and the housing component of the battery cell shown in ;

[0081] Fig.34 This is a schematic structural diagram of the electrode component of the battery cell of some embodiments of the present application being installed in the housing component and before the insulating bracket is deformed;

[0082] Fig.35 This is a schematic diagram of the structure of a battery cell in some embodiments of the present application after the electrode component of the battery cell is installed in the housing component and the insulating bracket is deformed;

[0083] Fig.36 for Fig.35 A schematic diagram of a local structure of a battery cell when the conductive portion is connected to the pole component as shown in FIG.

[0084] Fig.37 for Fig.35 A schematic diagram of a local structure of a battery cell when a pole component and a shell component are connected;

[0085] Fig.38 A schematic diagram of a pole component provided for some embodiments of the present application;

[0086] Fig.39 for Fig.38 A top view of the pole component shown in ;

[0087] Fig.40 For along Fig.39 The view from direction B shown in FIG.

[0088] Fig.41 For along Fig.39 Sectional view of the mid-CC line;

[0089] Fig.42 A partial cross-sectional view of a battery cell provided for some embodiments of the present application;

[0090] Fig.43 A partial cross-sectional view of a battery cell provided for some embodiments of the present application;

[0091] Fig.44 A partial cross-sectional view of a battery cell provided for some embodiments of the present application;

[0092] Fig.45 A cross-sectional view of a battery cell provided for some embodiments of the present application;

[0093] Fig.46 A cross-sectional view of a battery cell provided for some embodiments of the present application;

[0094] Fig.47 A cross-sectional view of a battery cell provided for some embodiments of the present application;

[0095] Fig.48 A partial cross-sectional view of a battery cell provided in some embodiments of the present application, in which the pole component is in a state before being covered by the mounting wall;

[0096] Fig.49 for Fig.48 The state diagram of the pole component cover after being installed on the mounting wall shown in FIG.

[0097] Fig.50 An exploded view of a battery cell provided in some embodiments of the present application;

[0098] Fig.51 A partial cross-sectional view of a battery cell provided in some embodiments of the present application, in which the pole component is in a state before being covered by the mounting wall;

[0099] Fig.52 for Fig.51 The state diagram of the pole component cover after being installed on the mounting wall shown in FIG.

[0100] Fig.53 The structural cross-sectional views of battery cells of some other embodiments of the present application;

[0101] Fig.54 for Fig.53 A partial enlarged view of a battery cell shown in ;

[0102] Fig.55 The structural cross-sectional views of battery cells of other embodiments of the present application;

[0103] Fig.56 for Fig.55 A partial enlarged view of a battery cell shown in ;

[0104] Fig.57 A schematic diagram of the structure of a battery cell in some other embodiments of the present application;

[0105] Fig.58 for Fig.57 An exploded view of the structure of the battery cell shown in ;

[0106] Fig.59 for Fig.57 A structural cross-sectional view of a battery cell shown in ;

[0107] Fig.60 for Fig.59 A partial enlarged view of a battery cell shown in ;

[0108] Fig.61 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application;

[0109] Fig.62 An exploded view of the processing of a battery cell provided by one embodiment of the present application;

[0110] Fig.63 An exploded view of the processing of a battery cell provided by one embodiment of the present application;

[0111] Fig.64 An exploded view of the processing of a battery cell provided by one embodiment of the present application;

[0112] Fig.65 An exploded view of the processing of a battery cell provided by one embodiment of the present application;

[0113] Fig.66 An exploded view of the processing of a battery cell provided in accordance with an embodiment of the present application.

[0114] The reference numerals in the specific implementation manner are as follows:

[0115] Vehicles 1000;

[0116] Battery 100; Controller 200; Motor 300;

[0117] Box body 101; first box part 1011; second box part 1012; box body bottom plate 1013;

[0118] Battery cell 102; first direction F1; second direction F2; third direction F3;

[0119] fourth direction F4; fifth direction F5;

[0120] Shell component 1; shell body 11; mounting wall 111; first sink 1111; overlap portion 1112; mounting hole 112; opening 113; peripheral wall 114; shell cover 12; accommodating cavity 13; sealing ring 14; support plate 15;

[0121] Pole component 2; first accommodating groove 201; pole body 21; inner end surface 211; peripheral portion 212; penetration portion 214; riveted portion 2141; inner limit portion 215; outer limit portion 216; first pole component 21a; second pole component 21b; matching hole 21b1; transition structure 22; inner end surface 220 of the transition structure; surrounding area 2201; flange portion 22a; second sink groove 22b; first adapter ring 221; second adapter ring 222; stop ring portion 2221; third adapter ring 223; inner extension portion 2231; outer extension portion 2232; first insulating frame 224; second insulating frame 225; fourth adapter ring 227; matching ring portion 2271; third insulating frame 228; insulating structure 23; sealing structure 231; shaft side portion 231a; first insulating member 232; second insulating member 234;

[0122] Electrode component 3; electrode assembly 31; pole ear sheet 311; gathering portion 313; active material coating portion 32; conductive portion 33; closing 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 slot 334; first opening slot 3341; second opening slot 3342; pole ear 335; pole ear end 3351; conductive member 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;

[0123] Pressure relief device 6;

[0124] Insulating film 7; first avoidance hole 701; tearing structure 702; first tearing portion 7021; second tearing portion 7022; breaking structure 703; main body insulating portion 71; main body 711; first insulating portion 72; second insulating portion 73;

[0125] Holding sheet 8;

[0126] Insulating bracket 9; second avoidance hole 901; first hole wall 9011; second hole wall 9012; through hole 902; bracket body 91; first separator 92; second separator 93. DETAILED DESCRIPTION

[0127] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0128] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0129] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0130] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0131] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0132] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0133] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0134] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0135] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0136] In the related art, the active material coating portion of the battery cell may move relative to the pole when the battery vibrates, resulting in the connection reliability between the pole and the lug to be further improved, which also hinders the further improvement of the reliability of the battery.

[0137] In order to improve the reliability of the battery cell, the embodiment of the present application bends the conductive part to form at least two open grooves, the openings of the two open grooves face different directions and are arranged at intervals in the thickness direction of the installation wall, so that the conductive part can play a better buffering role and improve the reliability of the battery cell.

[0138] The battery cell disclosed in the embodiments of the present application can be used in electrical devices that use batteries as power sources or 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, electric tools, battery cars, electric cars, ships, spacecraft, etc. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0139] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0140] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 of some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000. The battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000. For example, the battery 100 may be used as an 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 power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0141] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0142] Please refer to Figure 2 , Figure 2The exploded diagram of the battery 100 of some embodiments of the present application. The battery 100 includes a box body 101 and a battery cell 102, and the battery cell 102 is accommodated in the box body 101. Among them, the box body 101 is used to provide a storage space for the battery cell 102, and the box body 101 can adopt a variety of structures. In some embodiments, the box body 101 may include a first box part 1011 and a second box part 1012, the first box part 1011 and the second box part 1012 cover each other, and the first box part 1011 and the second box part 1012 jointly define a storage space for accommodating the battery cell 102. The second box part 1012 may be a hollow structure with one end open, and the first box part 1011 may be a plate-like structure, and the first box part 1011 covers the open side of the second box part 1012, so that the first box part 1011 and the second box part 1012 jointly define a storage space; the first box part 1011 and the second box part 1012 may also be hollow structures with one side open, and the open side of the first box part 1011 covers the open side of the second box part 1012. Of course, the box body 101 formed by the first box part 1011 and the second box part 1012 may be in various shapes, such as a cylinder, a cuboid, etc.

[0143] In the battery 100, there may be multiple battery cells 102, and the multiple battery cells 102 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 102 are both connected in series and in parallel. The multiple battery cells 102 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 102 is accommodated in the box 101; of course, the battery 100 may also be a battery 100 module formed by connecting multiple battery cells 102 in series, in parallel, or in a mixed connection, and then the multiple battery 100 modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 101. The battery 100 may also include other structures, for example, the battery 100 may also include a busbar component for realizing electrical connection between the multiple battery cells 102.

[0144] Each battery cell 102 may be a secondary battery or a primary battery, or a lithium-sulfur battery, a sodium-ion battery, a magnesium-ion battery, or a solid-state battery, but is not limited thereto. The battery cell 102 may be cylindrical, flat, rectangular, or in other shapes.

[0145] Please refer to Figure 3 and Figure 4 , Figure 3 A schematic diagram of the structure of a battery cell 102 according to some embodiments of the present application; Figure 4 1 is a cross-sectional view of the structure of a battery cell 102 in some embodiments of the present application. The battery cell 102 refers to the smallest unit constituting the battery 100. Figure 3 and Figure 4The battery cell 102 includes a housing component 1, a pole component 2, an electrode component 3, an electrolyte and other functional components. The housing component 1 includes a housing cover 12 and a housing body 11.

[0146] The shell cover 12 refers to a component that covers the opening 113 of the shell body 11 to isolate the internal environment of the battery cell 102 from the external environment. Without limitation, the shape of the shell cover 12 can be adapted to the shape of the shell body 11 to match the shell body 11. Optionally, the shell cover 12 can be made of a material with a certain hardness and strength (such as an aluminum alloy), so that the shell cover 12 is not easily deformed when it is squeezed and collided, so that the battery cell 102 can have a higher structural strength and reliability can also be improved. Functional components such as the pole component 2 can be provided on the shell cover 12. The pole component 2 can be used to be electrically connected to the electrode component 3 for outputting or inputting electrical energy of the battery cell 102. In some embodiments, the shell cover 12 can also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 102 reaches a threshold. The material of the shell cover 12 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose special restrictions on this. In some embodiments, an insulating member may be provided inside the housing cover 12 to isolate the electrical connection components in the housing body 11 from the housing cover 12 to reduce the risk of short circuit. For example, the insulating member may be plastic, rubber, or the like.

[0147] The shell body 11 is a component used to cooperate with the shell cover 12 to form the internal environment of the battery cell 102, wherein the formed internal environment can be used to accommodate the electrode component 3, the electrolyte and other components. The shell body 11 and the shell cover 12 can be independent components, and an opening 113 can be set on the shell body 11, and the shell cover 12 is made to cover the opening 113 at the opening 113 to form the internal environment of the battery cell 102. Without limitation, the shell cover 12 and the shell body 11 can also be integrated. Specifically, the shell cover 12 and the shell body 11 can form a common connection surface before other components are put into the shell, and when it is necessary to encapsulate the interior of the shell body 11, the shell cover 12 is made to cover the shell body 11. The shell body 11 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell body 11 can be determined according to the specific shape and size of the electrode component 3. The shell 11 may be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special limitation on this.

[0148] The electrode component 3 includes an electrode assembly 31, which is a component where an electrochemical reaction occurs in the battery cell 102. One or more electrode assemblies 31 may be included in the shell 11. The electrode assembly 31 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body of the electrode assembly 31, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute a pole ear 335. The positive pole ear and the negative pole ear may be located together at one end of the main body or at both ends of the main body respectively. During the charge and discharge process of the battery 100, the positive active material and the negative active material react with the electrolyte, and the pole ear 335 connects the pole column component 2 to form a current loop. Among them, in a solid-state battery, the electrolyte may be a solid electrolyte layer located between the positive and negative electrode sheets, and the above-mentioned separator may be omitted.

[0149] According to some embodiments of the present application, referring to Figure 4 , and please refer to Figure 5 , Figure 5 for Figure 4 In the partially enlarged view of the battery cell 102 shown in FIG. 1 , the housing component 1 defines a receiving cavity 13 , and the housing component 1 includes a mounting wall 111 , the pole component 2 is mounted on the mounting wall 111 , and the pole component 2 includes a pole body 21 .

[0150] Among them, the installation wall 111 is a partial shell wall of the shell component 1, which can be used as a mounting carrier of the pole component 2. The installation wall 111 can be a partial shell wall of the shell body 11, or a shell cover 12, or can also include a partial shell wall of the shell body 11 and the shell cover 12.

[0151] The battery cell 102 also includes an electrode component 3 , which is accommodated in the accommodating cavity 13 . The electrode component 3 includes an active material coating portion 32 and a conductive portion 33 . The conductive portion 33 connects the active material coating portion 32 and the pole body 21 to output or input electrical energy of the battery cell 102 .

[0152] like Figure 3 and Figure 4 As shown in the figure, 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, the width direction of the active material coating part 32 is the third direction F3, and the conductive part 33 can be connected to one end or both ends of the active material coating part 32 along the height direction.

[0153] The conductive portion 33 is bent to form at least two opening slots 334, the openings of the two opening slots 334 face different directions, and the two opening slots 334 are spaced apart in the thickness direction of the mounting wall 111. For example, the openings of the two opening slots 334 face opposite directions, that is, the openings of the two opening slots 334 face 180 degrees; for another example, the openings of the two opening slots 334 face obtuse angles, so that the conductive portion 33 can present a reciprocating serpentine shape.

[0154] In the technical solution of the embodiment of the present application, by bending the conductive part 33 to form the above-mentioned shape, 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, through the setting of two open grooves 334, the conductive part 33 is bent regularly, and the bent part is not easy 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, and can also improve the mutual interference and scratching between the pole ear sheets 311 and the pole ear sheets 311 in the conductive part 33, reduce lithium plating, and further improve the reliability of the battery cell 102.

[0155] In some embodiments, one end of the conductive part 33 is directly connected to the active material coating part 32, and the other end is directly connected to the pole body 21. In other words, the active material coating part 32 is connected to the pole body 21 through the conductive part 33, and forms electrical conduction. This arrangement can simplify the structure of the battery cell 102 and improve the production efficiency of the battery cell 102.

[0156] Exemplarily, the battery 100 includes a busbar component located outside the battery cell 102 , and the pole body 21 is connected to the busbar component to form electrical conduction, so that a plurality of battery cells 102 can be connected through the busbar component.

[0157] Exemplarily, when the pole component 2 is a negative pole, the pole body 21 can be a copper-aluminum composite part, wherein the copper-aluminum composite part can include an aluminum part and a copper part, the aluminum part is arranged on the side of the copper part away from the active material coating part 32, and is easy to form a reliable connection with the aluminum runner component, and the copper part is easy to connect with the copper foil pole ear piece 311 of the negative pole; and when the pole component 2 is a positive pole, the pole body 21 can be an aluminum part, and the aluminum part is easy to form a reliable connection with the aluminum runner component, and the aluminum part is also easy to connect with the aluminum foil pole ear piece 311 of the positive pole.

[0158] There is no limitation on the connection method between the conductive part 33 and the pole component 2 , for example, it may include, but not limited to, ultrasonic welding, ultrasonic pre-welding combined with laser welding, resistance welding, pressure fusion welding, brazing, gluing, etc.

[0159] Please refer again Figure 5 In the embodiment of the present application, the conductive portion 33 includes a close segment 331, a first extension segment 332 and a second extension segment 333, and the close segment 331, the first extension segment 332 and the second extension segment 333 are arranged in the extension direction of the conductive portion 33, the close segment 331 is connected to the active material coating portion 32, and the second extension segment 333 is connected to the pole body 21, and the first end of the first extension segment 332 is connected to the close segment 331 through the first bending portion 3320, and the first side of the first extension segment 332 forms an open groove 334 with the first bending portion 3320 and the close segment 331, and the other end of the first extension segment 332 is connected to the second extension segment 333 through the second bending portion 3330, and the second side of the first extension segment 332 opposite to the first side forms another open groove 334 with the second bending portion 3330 and the second extension segment 333.

[0160] Specifically, the first extension section 332 and the second extension section 333 are arranged at an angle in opposite directions, and the two ends of the first bent portion 3320 are respectively connected to the approaching section 331 and the starting end of the first extension section 332, so that an opening groove 334 is defined by the approaching section 331, the first bent portion 3320 and the first extension section 332, which is recorded as the first opening groove 3341, and the two ends of the second bent portion 3330 are respectively connected to the end of the first extension section 332 and the starting end of the second extension section 333, so that another opening groove 334 is defined by the first extension section 332, the second bent portion 3330 and the second extension section 333, which is recorded as the second opening groove 3342, and the direction of the opening of the first opening groove 3341 (such as Figure 5 left as shown) and the direction of the opening of the second opening slot 3342 (as shown Figure 5 Alternatively, the opening direction of the first opening slot 3341 and the opening direction of the second opening slot 3342 are set at an obtuse angle, so that the conductive portion 33 is arranged roughly in an "S" shape.

[0161] In the above technical solution, by forming the conductive part 33 into an "S" shape, the conductive part 33 can play a better buffering role, and can also improve the mutual interference and scratching between the pole ear pieces 311 and the pole ear pieces 311 in the conductive part 33, further improving the reliability of the battery cell 102.

[0162] Please refer again Figure 5In the embodiment of the present application, the first bending portion 3320 is arranged in the center in the width direction of the pole body 21; or, the first bending portion 3320 is on one side of the center position in the width direction of the pole body 21, and the second bending portion 3330 is located on the other side of the center position in the width direction of the pole body 21. In this way, the first bending portion 3320 and the second bending portion 3330 can be arranged in the width direction of the pole, so that the conductive portion 33 can be arranged in a roughly "S" shape, thereby meeting the design requirements.

[0163] For example, see Attachment Figure 5 The first bending portion 3320 is arranged in the center in the width direction of the pole body 21, and the second bending portion 3330 can be arranged to the left of the middle part of the pole body 21 in the width direction. In addition, the opening of the opening groove 334 defined by the approaching section 331, the first bending portion 3320 and the first extending section 332 faces left, and the opening of the opening groove 334 defined by the first extending section 332, the second bending portion 3330 and the second extending section 333 faces right, so that the conductive portion 33 is arranged roughly in an "S" shape.

[0164] For another example, the first bending portion 3320 can be arranged to the right of the middle part of the pole body 21 in the width direction, and the second bending portion 3330 can be arranged to the left of the middle part of the pole body 21 in the width direction. In addition, the opening of the opening groove 334 defined by the approaching section 331, the first bending portion 3320 and the first extension section 332 faces left, and the opening of the opening groove 334 defined by the first extension section 332, the second bending portion 3330 and the second extension section 333 faces right, so that the conductive portion 33 is arranged roughly in an "S" shape.

[0165] Please refer again Figure 5 , and further refer to Figure 6-Figure 8 , Figure 6 for Figure 3 The schematic diagram of the partial structure of the conductive portion 33 of the battery cell 102 shown in FIG. 1 is in a straightened state, Figure 7 for Figure 3 The schematic diagram of the local structure of the battery cell 102 when the conductive part 33 is connected to the pole component 2 shown in FIG. Figure 8 for Figure 3 The partial structural diagram of the battery cell 102 when the pole component 2 is connected to the shell component 1 is shown in FIG. In the embodiment of the present application, the conductive portion 33 includes a plurality of stacked pole tabs 311 (such as Fig.11 As shown in FIG. 1 , the plurality of tabs 311 are close to each other at the root of the active material coating portion 32 to form a triangular close segment 331 .

[0166] For ease of understanding, a cross section perpendicular to the length direction of the pole body 21 (the third direction F3 as shown in the figure) is taken, and the cross section of the conductive portion 33 is a triangle.

[0167] The triangle can be an isosceles triangle, that is, the vertex of the triangle is aligned with the middle position of the pole body 21 in the width direction of the pole body 21, so that the first bending portion 3320 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 deviate from the middle position of the pole body 21, so that the first bending portion 3320 can be offset relative to the middle of the pole body 21 in the width direction, thereby reserving deformation for the bending of the conductive portion 33.

[0168] In the above technical solution, the roots of the multiple pole tabs 311 adjacent to the active material coating portion 32 are brought together to form a triangular close section 331, so that the multiple pole tabs 311 can be stacked and formed into a whole that is not easy to loosen, thereby facilitating the connection between the conductive portion 33 and the pole body 21.

[0169] Please refer again Figure 6-Figure 8 In the embodiment of the present application, the conductive portion 33 includes a plurality of stacked tabs 311, and the plurality of tabs 311 are connected at one 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 may be an arc-shaped structure, and the position of the first connecting portion 3331 may be a tangent position between the first bending portion 3320 and the first extending section 332.

[0170] Connecting one end of the first bending portion 3320 away from the approaching section 331 to form a first connecting portion 3331 can connect together a plurality of originally stacked and easily loose pole lug sheets 311, and the plurality of pole lug sheets 311 are not easily loose at the first connecting portion 3331. This can reduce the possibility of the pole lug sheets 311 being forked and inserted upside down into the active material coating portion 32 after being bent, thereby reducing the risk of short circuit in the battery cell 102 and improving the reliability of the battery cell 102.

[0171] Please refer again Figure 6 In the embodiment of the present application, when the conductive portion 33 is in a straightened state, a distance h1 between the first connecting portion 3331 and an end of the active material coating portion 32 close to the mounting wall 111 is less than or equal to 2.5 mm.

[0172] Here, “the conductive portion 33 is in a straightened state” means that before the conductive portion 33 is bent, the conductive portion 33 is in a straightened state along the height direction of the active material coating portion 32 (eg Figure 6 The state of extending in the first direction F1) shown.

[0173] For example, the distance h1 between the first connection portion 3331 and the end of the active material coating portion 32 close to the mounting wall 111 may be 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, etc.

[0174] If the distance h1 between the first connecting portion 3331 and the end of the active material coating portion 32 close to the mounting wall 111 is too large, the size of the approaching section 331 in the thickness direction of the mounting wall 111 will be too large, making it easy for the multiple pole tabs 311 to become loose at the approaching section 331, and making it easy for the pole tabs 311 to bifurcate and possibly be inserted upside down into the active material coating portion 32; if the distance h1 between the first connecting portion 3331 and the end of the active material coating portion 32 close to the mounting wall 111 is too small, making it easy for the multiple pole tabs 311 to become loose at the first extending section 332, and making it easy for the pole tabs 311 to bifurcate and possibly be inserted upside down into the active material coating portion 32.

[0175] In the above technical solution, by limiting the distance between the first connecting portion 3331 and the end of the active material coating portion 32 close to the mounting wall 111 to meet the above range, the problem of multiple pole tabs 311 becoming loose after the conductive portion 33 is bent can be reduced, and the possibility of the pole tabs 311 bifurcating and being inserted upside down into the active material coating portion 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.

[0176] Please refer again Figure 5 In an embodiment of the present application, an insulating bracket 9 is provided between the end where the active material coating portion 32 is connected to the conductive portion 33 and the mounting wall 111 , the insulating bracket 9 has a through hole 902 , the conductive portion 33 is passed through the through hole 902 , and the conductive portion 33 is connected to the pole body 21 .

[0177] The insulating bracket 9 can support the active material coating part 32, and can also isolate the active material coating part 32 from the mounting wall 111 of the shell component 1, thereby reducing the probability of the active material coating part 32 contacting the mounting wall 111, thereby reducing the risk of the mounting wall 111 of the shell component 1 being corroded due to leakage of the active material coating part 32, reducing the risk of leakage, and then improving the reliability and stability of the battery cell 102.

[0178] Among them, the end of the through hole 902 close to the active material coating part 32 has a first hole edge, the end of the through hole 902 close to the pole body 21 has a second hole edge, and 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 hole edge and the active material coating part 32.

[0179] That is to say, 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 portion 3331 is higher than the lowest edge of the perforation 902, so that the connection position of the multiple pole ear pieces 311 at the end of the first bending portion 3320 away from the approaching section 331 is higher than the lowest edge of the perforation 902, further reducing the possibility of the conductive portion 33 becoming loose, and is more conducive to improving the reliability of the battery cell 102.

[0180] Please refer again Figure 5 and Figure 6 In the embodiment of the present application, a plurality of tabs 311 are connected at one end of the second bending portion 3330 close to the second extension section 333 to form a second connection portion 3332. The second bending portion 3330 may be an arc-shaped structure, and the position of the second connection portion 3332 may be a tangent position between the second bending portion 3330 and the second extension section 333.

[0181] The second bending portion 3330 is connected to one end of the second extension section 333 to form a second connection portion 3332, so that the multiple pole ear sheets 311 that are originally stacked and easy to loosen can be connected together, and the multiple pole ear sheets 311 are not easy to loosen at the second connection portion 3332. On the one hand, this can reduce the possibility of the pole ear sheets 311 being upside down and inserted into the active material coating portion 32 due to bifurcation after the multiple pole ear sheets 311 are bent, and on the other hand, it is convenient for the connection between the second extension section 333 and the pole body 21.

[0182] Please refer again Figure 6 In an embodiment of the present application, when the conductive portion 33 is in a straightened state, a distance h2 between the first connection portion 3331 and the second connection portion 3332 is less than or equal to 16 mm, and a distance h3 between the second connection portion 3332 and one end of the second extension section 333 away from the active material coating portion 32 is greater than or equal to 8 mm.

[0183] For example, the distance h2 between the first connection part 3331 and the second connection part 3332 can be 8mm, 10mm, 12mm, 14mm, 16mm, etc., and the distance h3 between the second connection part 3332 and one end of the second extension section 333 away from the active material coating part 32 can be 8mm, 10mm, 12mm, 14mm, 16mm, etc.

[0184] In the above technical scheme, by limiting the distance between the first connecting portion 3331 and the second connecting portion 3332 to meet the above range, on the one hand, the problem of multiple pole tabs 311 becoming loose after the conductive portion 33 is bent can be reduced, and the possibility of the pole tabs 311 being bifurcated and inserted upside down into the active material coating portion 32 can be reduced; on the other hand, after the conductive portion 33 is bent, the second connecting portion 3332 can be located between the pole body 21 and the second edge of the through hole 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 portion 32, making the structure of the battery cell 102 more compact.

[0185] In addition, by limiting the distance between the second connecting portion 3332 and one end of the second extension section 333 away from the active material coating portion 32 to meet the above-mentioned range, the connection area between the second extension section 333 and the pole body 21 can be guaranteed, thereby improving the connection reliability between the conductive portion 33 and the pole body 21, making the conductivity between the electrode component 3 and the pole component 2 more stable and reliable, thereby improving the reliability of the battery cell 102.

[0186] Please refer again Figure 5 In the embodiment of the present application, the conductive portion 33 includes a tab 335, the tab 335 includes a plurality of tab sheets 311 stacked, and the close section 331, the first extension section 332, and the second extension section 333 are formed by different parts of the tab 335. In other words, the tab 335 is directly connected to the pole body 21, so the conductive member 336 described below can be omitted, and the connection step between the conductive member 336 and the tab 335 is omitted, which is conducive to improving the production efficiency of the battery cell 102.

[0187] In addition, by pre-gathering the multiple pole ear pieces 311 of the pole ear 335, the second extension section 333 of the conductive part 33 can be in the form of a plate with a certain rigidity in which multiple layers of pole ear pieces 311 are connected together, rather than in the form of a fluffy and scattered multiple layers of foil, thereby facilitating the matching connection between the pole ear 335 and the pole body 21, making the welding of the pole ear 335 and the pole body 21 more reliable, and it is not easy to form gaps in the weld, which can improve the connection reliability and conductivity of the welding point, and make the conduction between the electrode component 3 and the pole component 2 more stable and reliable.

[0188] Please refer again Figure 5 and Figure 8In an embodiment of the present application, a plurality of pole tabs 311 are brought together and connected at a position where the approaching section 331 is away from the active material coating portion 32 to form a first extension section 332 and a second extension section 333. A plurality of pole tabs 311 are connected at the second extension section 333 to form a third connection portion 3333. The third connection portion 3333 is in the shape of a long strip extending along the length direction of the pole body 21, and the third connection portion 3333 is centered in the width direction of the pole body 21.

[0189] Among them, multiple pole tabs 311 can be connected at the second extension section 333 by ultrasonic welding to form a third connection portion 3333. By ultrasonic welding, the surfaces of any two adjacent pole tabs 311 can be closely contacted and connected, and the weld strength and stability are high, which is conducive to improving the structural integrity and reliability of the conductive portion 33. In addition, the ultrasonic welding method has a fast welding speed, which is conducive to improving the welding efficiency. Of course, multiple pole tabs 311 can also be connected at the second extension section 333 by laser welding. The second extension section 333 and the pole body 21 can be connected by laser welding.

[0190] In the above technical solution, by arranging the third connecting portion 3333 in the center in the width direction of the pole body 21, on the one hand, the size requirement for the second extension section 333 can be reduced, thereby reducing the difficulty of connecting the conductive portion 33 and the pole body 21; on the other hand, the conductive portion 33 can be bent to move closer to the center position between the pole body 21 and the active material coating portion 32, so that the shape of the conductive portion 33 after bending can be controlled.

[0191] Please refer to Figure 9-11 , Fig. 9 The structure cross-sectional view of the battery cell 102 of some other embodiments of the present application; Fig.10 for Fig. 9 A partial enlarged view of the battery cell 102 shown in FIG. Fig.11 for Fig. 9 Schematic diagram of the partial structure of the conductive part 33 of the battery cell 102 during shaping shown in . In the embodiment of the present application, the conductive part 33 includes a pole ear 335 and a conductive member 336, the pole ear 335 is connected to one end of the active material coating part 32 close to the mounting wall 111, the pole ear 335 includes a plurality of pole ear sheets 311 stacked, the conductive member 336 is connected between the pole ear 335 and the pole body 21, a part of the conductive member 336 forms the second extension section 333, another part of the conductive member 336 forms at least a part of the first extension section 332, and at least a part of the pole ear 335 forms the close section 331.

[0192] Thus, by indirectly connecting the pole tab 335 and the pole body 21 through the conductive member 336, the length of the pole tab 335 can be shortened, and the problems of wrinkling, bending and breaking of the pole tab sheet 311 can be improved. Moreover, the shape and material of the conductive member 336 can be flexibly designed to reduce the difficulty of connection with the pole body 21 and improve the convenience of connection between the conductive member 336 and the pole body 21. In addition, the operation of punching the hole 902 of the pole tab 335, the operation of connecting the pole tab 335 with the pole component 2 (which may not be required), and the operation of connecting the pole component 2 with the shell component 1 are not likely to cause cracking at the connection position between the active material coating part 32 and the conductive part 33, thereby improving the reliability of the battery cell 102.

[0193] Please refer to further Fig.12 and Fig.13 , Fig.12 for Fig. 9 An exploded view of the structure of the conductive portion 33 of the battery cell 102 shown in FIG. Fig.13 for Fig. 9 The conductive part 33 of the battery cell 102 is in a straightened state. In the embodiment of the present application, the conductive member 336 has a slot 3361 , and the tab 335 is at least partially inserted into the slot 3361 .

[0194] Specifically, the conductive member 336 may include a first connecting section 3362, the first connecting section 3362 includes two clamping parts 3360, a slot 3361 is defined between the two clamping parts 3360, and one end of the pole tab 335 away from the active material coating part 32 is clamped between the two clamping parts 3360 and connected to the clamping part 3360. Thus, the two clamping parts 3360 can be used to limit the end of the pole tab 335 away from the active material coating part 32 (referred to as the pole tab end 3351), thereby improving the connection reliability between the pole tab 335 and the conductive member 336.

[0195] Among them, the end portion 3351 of the pole ear between the two clamping parts 3360 can be a structure in which the ends of multiple stacked pole ear sheets 311 are pre-connected together, thereby simplifying the processing process and improving the processing efficiency. Of course, the end portion 3351 of the pole ear between the two clamping parts 3360 can also be the end portion of multiple stacked pole ear sheets 311, that is, before the pole ear 335 is connected to the conductive member 336, the ends of the multiple stacked pole ear sheets 311 of the pole ear 335 are not pre-connected together by welding or other methods.

[0196] Furthermore, the conductive member 336 may further include a second connecting segment 3363 , and the second connecting segment 3363 is directly connected to the pole body 21 .

[0197] In an embodiment of the present application, the conductive member 336 includes a transfer sheet, which includes a plurality of transfer foils stacked and connected so that the transfer sheet can be deformed. The material of the plurality of transfer foils can be the same as that of the tab 335, and the plurality of transfer foils can be welded at several key positions by ultrasonic welding or the like so that the plurality of transfer foils are connected together.

[0198] Since the thickness of the multiple transfer foils is relatively small, the multiple transfer foils are equivalent to a multi-layer thin plate. The transfer sheet formed by the multiple transfer foils is easier to bend than the one-piece formed transfer sheet, so that the transfer sheet and the pole ear 335 can be bent as needed, so that the conductive part 33 forms a preset "S" shape, thereby meeting the design requirements.

[0199] Please refer to 11- Fig.13 , and further refer to Figure 14-16 , Fig.14 for Fig. 9 A schematic structural diagram of the electrode component 3 of the battery cell 102 shown in FIG. 1 being installed in the housing component 1; Fig.15 for Fig. 9 A schematic diagram of a partial structure when the conductive portion 33 of the battery cell 102 is connected to the pole component 2; Fig.16 for Fig. 9 Schematic diagram of the partial structure of the battery cell 102 when the pole part 2 is connected to the shell part 1. In the embodiment where the mounting wall 111 is the wall of the shell body 11 opposite to the shell cover 12, during assembly, the multiple pole tabs 311 of the pole tab 335 can be shaped and gathered first, and the adapter plate and the pole tab 335 can be connected together to form the conductive part 33, and then the active material coating part 32 with the conductive part 33 is installed in the shell body 11, and after the shell cover 12 is connected to the shell body 11, the adapter plate extending out of the shell body 11 is connected to the pole body 21, and finally the pole part 2 is rotated and fixed to the mounting wall 111 of the shell part 1. After assembly, the conductive part 33 formed by the connection between the pole tab 335 and the adapter plate can be roughly in an "S" shape.

[0200] Please refer again Figure 4 and Figure 5 In an embodiment of the present application, the electrode component 3 further includes an insulating member, which is at least partially disposed between the end portion where the active material coating portion 32 is connected to the conductive portion 33 and the pole body 21 .

[0201] Specifically, the active material coating portion 32 has a Figure 5The first end and the second end are arranged oppositely in the first direction F1 shown in the figure. If the conductive part 33 is arranged at the first end of the active material coating part 32, the wall body of the shell part 1 and the first end of the active material coating part 32 arranged oppositely is the installation wall 111, and the insulating member is at least partially arranged between the first end of the active material coating part 32 and the pole body 21; if the conductive part 33 is arranged at the second end of the active material coating part 32, the wall body of the shell part 1 and the second end of the active material coating part 32 arranged oppositely is the installation wall 111, and the insulating member is at least partially arranged between the second end of the active material coating part 32 and the pole body 21; if the conductive part 33 is arranged at the first end and the second end of the active material coating part 32, the wall body of the shell part 1 and the first end and the second end of the active material coating part 32 arranged oppositely are both the installation wall 111, and at least a part of the insulating member is arranged between the first end of the active material coating part 32 and one of the pole bodies 21, and at least another part of the insulating member is arranged between the second end of the active material coating part 32 and another of the pole bodies 21.

[0202] The insulating part can be used to isolate the active material coating part 32 from the mounting wall 111 of the shell component 1, reducing the probability of the active material coating part 32 contacting the mounting wall 111 of the shell component 1, thereby reducing the risk of the mounting wall 111 of the shell component 1 being corroded due to leakage of the active material coating part 32, reducing the risk of failure of the active material coating part 32 itself, and reducing the risk of leakage, thereby improving the reliability and stability of the battery cell 102.

[0203] The insulating member is provided with an escape hole for the conductive part 33 to pass through, so that the conductive part 33 can pass through the insulating member to be electrically connected to the pole body 21 of the pole component 2. The insulating member blocks the portion where the conductive part 33 passes through the insulating member and is connected to the pole body 21, and the active material coating part 32.

[0204] Here, “the portion where the conductive part 33 passes through the insulating member and is connected to the pole body 21” may refer to the portion where the conductive part 33 is directly connected to the pole body 21, or may refer to the portion where the conductive part 33 extends out of the insulating member and is indirectly connected to the pole body 21. The insulating member may be used to isolate the portion where the conductive part 33 passes through the insulating member from the active material coating portion 32, thereby reducing the probability that the conductive part 33 is inserted into the active material coating portion 32 due to redundancy, thereby reducing the risk of short circuit of the battery cell 102 and improving the reliability of the battery cell 102.

[0205] Therefore, in the above technical scheme, by setting an insulating part, an insulating effect can be achieved. On the one hand, the active material coating part 32 can be isolated from the mounting wall 111 of the shell component 1, and the probability of the active material coating part 32 contacting the mounting wall 111 of the shell component 1 can be reduced, thereby reducing the risk of the mounting wall 111 of the shell component 1 being corroded due to leakage of the active material coating part 32, reducing the risk of failure of the active material coating part 32 itself, and reducing the risk of leakage, thereby improving the reliability and stability of the battery cell 102. On the other hand, the part of the conductive part 33 passing through the insulating part and the active material coating part 32 can be isolated, reducing the probability of the conductive part 33 being inverted into the active material coating part 32 due to redundancy, thereby reducing the risk of short circuit in the battery cell 102, which is beneficial to improving the reliability of the battery cell 102.

[0206] Please refer to Fig.17 and Fig.18 , Fig.17 Schematic diagram of the structure of the electrode component 3 and the insulating film 7 of the battery cell 102 in some embodiments of the present application; Fig.18 Schematic diagram of the structure of the electrode component 3 and the insulating film 7 of the battery cell 102 of other embodiments of the present application. In the embodiment of the present application, the insulating member includes the insulating film 7, and the insulating film 7 fully covers the active material coating part 32. The "fully covered" here means that the insulating film 7 covers all surfaces of the active material coating part 32, so that the insulating film 7 can isolate the outer surface of the active material coating part 32 from the shell part 1, reduce the risk of the shell part 1 being corroded due to the naked leakage of the active material coating part 32, reduce the risk of the active material coating part 32 itself failing, and reduce the risk of leakage, thereby improving the reliability and stability of the battery cell 102.

[0207] Among them, the avoidance hole includes a first avoidance hole 701, which is opened at a position opposite to the insulating film 7 and the mounting wall 111, and the first avoidance hole 701 is adapted to the thickness of the conductive part 33, and the insulating film 7 forms a surrounding wall of the first avoidance hole 701 to block between the first extension section 332 and the active material coating part 32, and between the second extension section 333 and the active material coating part 32.

[0208] Here, “the size of the first avoidance hole 701 is adapted to the thickness of the conductive part 33 ” means that the size of the first avoidance hole 701 in the thickness direction of the conductive part 33 at the portion of the conductive part 33 located at the first avoidance hole 701 is adapted to the thickness direction of the conductive part 33 .

[0209] The size of the first avoidance hole 701 itself cannot be too small, or the first avoidance hole 701 in use (the size of the first avoidance hole 701 opened under the squeezing action of the conductive part 33) cannot be too small, otherwise the conductive part 33 cannot be smoothly and quickly penetrated; the size of the first avoidance hole 701 itself cannot be too large, or the first avoidance hole 701 in use (the size of the first avoidance hole 701 opened under the squeezing action of the conductive part 33) cannot be too large, otherwise the risk of naked leakage of the active material coating part 32 will increase.

[0210] In the above technical solution, by making the size of the first avoidance hole 701 match the thickness of the conductive part 33, on the one hand, the first avoidance hole 701 allows the conductive part 33 to pass through the insulating film 7, so that the conductive part 33 can be electrically connected to the pole body 21 of the pole component 2, and on the other hand, when the conductive part 33 is inserted into the first avoidance hole 701, the insulating film 7 can also cover the close section 331 of the conductive part 33, further realizing insulation protection for the active material coating part 32, reducing the risk of bare leakage of the active material coating part 32, and also realizing the close section 331 of the conductive part 33 Insulation protection separates the first extension section 332 and the second extension section 333 from the approaching section 331, so that the insulating film 7 at least partially blocks the space between the first extension section 332 and the active material coating portion 32, and between the second extension section 333 and the active material coating portion 32. Even if the insulating film 7 blocks the portion where the conductive portion 33 passes through the first avoidance hole 701 and is connected to the pole body 21, and between the active material coating portion 32, the probability of the conductive portion 33 being invertedly inserted into the active material coating portion 32 and the approaching section 331 due to redundancy is reduced, thereby reducing the risk of short circuit in the battery cell 102.

[0211] Please refer again Fig.17 In some optional embodiments of the present application, the first avoidance hole 701 itself is a normally open hole adapted to the thickness of the conductive part 33, that is, when the insulating film 7 is in a natural state (a state in which the insulating film 7 is not squeezed by the conductive part 33), the size of the first avoidance hole 701 is greater than zero.

[0212] In the above technical solution, by setting the first avoidance hole 701 as a normally open hole, the conductive part 33 can quickly pass through the insulating film 7, which is beneficial to improving the efficiency of the insulating film 7 wrapping the active material coating part 32, thereby improving the assembly efficiency of the battery cell 102, and in 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 deformation of the conductive part 33, reducing the operation steps for shaping the conductive part 33, and thus improving the assembly efficiency of the battery cell 102.

[0213] Please refer again Fig.18 , and further refer to Fig.19 , Fig.19for Fig.18 Schematic diagram of the structure of the insulating film 7 of the battery cell 102 shown in FIG. In some other optional embodiments of the present application, a tearing structure 702 is provided at a position of the insulating film 7 opposite to the mounting wall 111, and the tearing structure 702 is suitable for being torn under the action of the conductive part 33 to form a first avoidance hole 701 adapted to the thickness of the conductive part 33.

[0214] Specifically, in the process of wrapping the insulating film 7 on the outside of the active material coating part 32, when the conductive part 33 pushes open the tearing structure 702 on the insulating film 7, a first avoidance hole 701 that can be opened and closed can be formed on the insulating film 7, so that the conductive part 33 can smoothly pass through the first avoidance hole 701. Since the first avoidance hole 701 has a self-closing property, after the conductive part 33 is passed into place, the first avoidance hole 701 can gradually tend to close, so that the insulating film 7 can cover at least a portion of the approaching section 331 of the conductive part 33.

[0215] Therefore, in the above technical solution, by pre-arranging a tearing structure 702 on the insulating film 7, a first avoidance hole 701 that can be opened and closed can be formed in the process of covering the outer side of the active material coating part 32 with the insulating film 7. After the conductive part 33 is inserted into place, the first avoidance hole 701 can gradually tend to close, so that the insulating film 7 can cover at least a part of the approaching section 331 of the conductive part 33, thereby forming insulation protection for the approaching section 331 of the conductive part 33, so that the part of the conductive part 33 passing through the first avoidance hole 701 is separated from the approaching section 331, thereby reducing the probability of the conductive part 33 being inverted into the interior of the active material coating part 32 and the approaching section 331 due to redundancy, thereby reducing the risk of short circuit of the battery cell 102.

[0216] Please refer again Fig.19 In an embodiment of the present 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 pole body 21 (the third direction F3 as shown in the figure, that is, the width direction of the active material coating portion 32), and the second tearing portion 7022 extends in a direction that is at an angle to the length direction of the pole body 21, and the end of the first tearing portion 7021 is connected to the second tearing portion 7022.

[0217] For example, the second tear portion 7022 may extend along the width direction of the pole body 21 (the second direction F2 shown in the figure, i.e., the thickness direction of the active material coating portion 32), so that the extension direction of the first tear portion 7021 is perpendicular to the extension direction of the second tear portion 7022. For another example, the second tear portion 7022 may be inclined relative to the length direction of the pole body 21, so that the extension direction of the first tear portion 7021 and the extension direction of the second tear portion 7022 are arranged at an acute angle or an obtuse angle.

[0218] The first tearing portion 7021 and the second tearing portion 7022 can both be point-break structures. Specifically, each of the first tearing portion 7021 and the second tearing portion 7022 includes a plurality of connection parts and a plurality of disconnection parts, and the plurality of connection parts and the plurality of disconnection parts can be arranged in the respective extension directions of the first tearing portion 7021 and the second tearing portion 7022. When the conductive portion 33 pushes open the tearing structure 702 on the insulating film 7, the plurality of connection parts of the first tearing portion 7021 and the plurality of connection parts of the second tearing portion 7022 are disconnected, thereby forming a first avoidance hole 701 that can be opened and closed at the tearing structure 702 of the insulating film 7.

[0219] Of course, both the first tear portion 7021 and the second tear portion 7022 can be a thickness-reduced structure, which can be torn open under the extrusion of the conductive portion 33 to form a first avoidance hole 701 that can be opened and closed; or, one of the first tear portion 7021 and the second tear portion 7022 is a point-break structure, and the other is a thickness-reduced structure.

[0220] In the above technical solution, by setting the tear structure 702 to include a first tear portion 7021 and a second tear portion 7022 set at an angle, the first avoidance hole 701 formed can be opened and closed, and the insulating film 7 can adjust the opening of the first avoidance hole 701 according to the shape of the approaching section 331, so that the conductive part 33 can be smoothly inserted into the first avoidance hole 701, and the risk of the insulating film 7 being severely torn can be reduced, and the insulating protection performance of the insulating film 7 to the active material coating part 32 can be further improved, and the probability of the conductive part 33 being invertedly inserted into the active material coating part 32 due to redundancy is further reduced, thereby further reducing the risk of short circuit of the battery cell 102.

[0221] Please refer again Fig.19 In the embodiment of the present application, the end of the first tear portion 7021 is connected to the middle of the second tear portion 7022, that is, the end of the first tear portion 7021 in the extension direction is connected to the middle of the second tear portion 7022 in its extension direction, so that the insulating film 7 can form at least two openable and closable insulating sheets at the tear structure 702, so that in the process of the conductive part 33 passing through the first avoidance hole 701, the two insulating sheets can be located on at least two opposite sides of the conductive part 33 to cover at least two opposite sides of the approaching section 331, so that the part of the conductive part 33 passing through the first avoidance hole 701 is separated from at least two opposite sides of the approaching section 331 of the conductive part 33, thereby reducing the probability of the conductive part 33 being inverted into the interior of the active material coating part 32 and the approaching section 331 due to redundancy, thereby reducing the risk of short circuit of the battery cell 102.

[0222] Please refer to Figure 20-Figure 22 , Fig. 20Schematic diagrams of the structure of the electrode component 3 and the insulating film 7 of the battery cell 102 in some other embodiments of the present application; Fig.21 for Fig. 20 A top view of the structure shown in ; Fig. 22 for Fig. 20 , a cross-sectional view of the structure of the electrode component 3 and the insulating film 7 is shown in FIG. In the embodiment of the present application, the number of the second tearing portions 7022 is two, and the two second tearing portions 7022 are arranged at intervals to be connected to the two ends of the first tearing portion 7021, respectively, so that the adjustable opening of the first avoidance hole 701 can be increased, so that the conductive portion 33 can be more smoothly inserted into the first avoidance hole 701, and the risk of the insulating film 7 being severely torn can be further reduced, thereby further reducing the risk of the battery cell 102 being short-circuited.

[0223] In an embodiment of the present application, the second tear portion 7022 extends along the width direction of the pole body 21, and the extension direction of the second tear portion 7022 is perpendicular to the extension direction of the first tear portion 7021, so that the insulating film 7 can form two openable and closable insulating sheets at the tear structure 702. On the basis of not 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 avoidance hole 701 can be improved, thereby improving the insulation protection performance of the insulating film 7, and further reducing the probability of the conductive portion 33 being inverted into the active material coating portion 32 due to redundancy, thereby reducing the risk of short circuit in the battery cell 102.

[0224] 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, the two second tearing portions 7022 are spaced apart in 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 first tearing portion 7021 in the extension direction are respectively connected to the middle parts of the two second tearing portions 7022 in the extension direction.

[0225] Therefore, in the above technical solution, the end of the first tear portion 7021 is connected to the middle of the second tear portion 7022, so that the insulating film 7 can form at least two openable insulating sheets at the tear structure 702, and the two insulating sheets can cover at least two opposite sides of the close section 331 of the conductive portion 33, thereby reducing the probability of the conductive portion 33 being inserted into the interior of the active material coating portion 32 and the close section 331 due to redundancy, thereby reducing the risk of short circuit of the battery cell 102; setting the number of the second tear portions 7022 to two can increase the number of the first avoidance hole 701. The adjustable opening can further reduce the risk of severe tearing of the insulating film 7, thereby further reducing the risk of short circuit in the battery cell 102; extending the second tear portion 7022 along the width direction of the pole body 21 can improve the structural integrity of the insulating film 7 at the first avoidance hole 701 without affecting the effect of the conductive portion 33 passing through the insulating film 7, thereby improving the insulation protection performance of the insulating film 7, and further reducing the probability of the conductive portion 33 being inverted into the active material coating portion 32 due to redundancy, thereby reducing the risk of short circuit in the battery cell 102.

[0226] Please refer again Fig.19 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 is wrapped around the circumference of the active material coating portion 32. The first insulating portion 72 and the second insulating portion 73 are respectively arranged at both ends of the main insulating portion 71. The first insulating portion 72 is located on a side of the main insulating portion 71 close to the mounting wall 111, and the first insulating portion 72 is wrapped around the end of the active material coating portion 32 close to the mounting wall 111. The second insulating portion 73 is located on a side of the main insulating portion 71 away from the mounting wall 111, and the second insulating portion 73 is wrapped around the end of the active material coating portion 32 away from the mounting wall 111. The first avoidance hole 701 is opened in the first insulating portion 72.

[0227] Among them, the cross-section of the active material coating part 32 can be circular, rectangular or polygonal, etc. When the cross-section of the active material coating part 32 is circular, the main body insulating part 71 can be rolled into a shape that matches the shape of the circumference (cylindrical surface) of the active material coating part 32 to wrap the circumference of the active material coating part 32, that is, the cross-sectional shape of the main body insulating part 71 is a circular ring. When the cross-section of the active material coating part 32 is rectangular, the main body insulating part 71 can be folded into a shape that matches the shape of the circumference (four side walls) of the active material coating part 32 to wrap the circumference of the active material coating part 32, that is, the cross-sectional shape of the main body insulating part 71 is a rectangular ring. When the cross-section of the active material coating part 32 is polygonal, the main body insulating part 71 can be folded into a shape that matches the shape of the circumference (multiple side walls) of the active material coating part 32 to wrap the circumference of the active material coating part 32, that is, the cross-sectional shape of the main body insulating part 71 is a polygonal ring.

[0228] When the battery cell 102 is placed vertically, the first insulating part 72 covers one end of the active material coating part 32, and the conductive part 33 passes through the first insulating part 72, the main insulating part 71 is wrapped around the active material coating part 32, and the second insulating part 73 covers the other end of the active material coating part 32.

[0229] 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 shell part 1, so as to substantially reduce the exposure of the active material coating part 32, reduce the risk of failure and damage of the electrode part 3, reduce the risk of corrosion of the shell part 1, and improve the reliability and stability of the battery cell 102.

[0230] Please refer again Fig.19 The main insulating portion 71 includes a plurality of main portions 711, which are connected end to end in a ring shape, and the plurality of main portions 711 are wrapped together on the circumference of the active material coating portion 32, and the first insulating portion 72 and the second insulating portion 73 are respectively located at the axial ends of the ring structure formed by the plurality of main portions 711.

[0231] Specifically, the number of the main body parts 711 can be two, three or more than three, which can be selected according to the shape of the active material coating part 32. For example, the number of the main body parts 711 and the number of the surfaces on the peripheral side of the active material coating part 32 can be set in a one-to-one correspondence, that is, multiple main body parts 711 cover multiple surfaces on the peripheral side of the active material coating part in a one-to-one correspondence. For another example, the number of main body parts 711 can be less than the number of surfaces on the peripheral side of the active material coating part 32, that is, when the insulating film 7 is in the unfolded state, the surface area of ​​at least one main body part 711 is greater than the surface area of ​​one surface on the peripheral side of the active material coating part 32, so that the main body part 711 can be used to cover two or more surfaces on the peripheral side of the active material coating part 32. For another example, the number of main body parts 711 can be more than the number of surfaces on the peripheral side of the active material coating part 32, so that at least a part of the multiple main body parts 711 can be overlapped.

[0232] Please refer again to 20- Fig. 22 In an embodiment of the present application, a retaining sheet 8 is connected to at least a portion of the circumference of the insulating film 7 around the first avoidance hole 701 , and the hardness of the retaining sheet 8 is greater than the hardness of the insulating film 7 .

[0233] 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; for another example, the retaining sheet 8 and the insulating film 7 can be made of different insulating materials.

[0234] The number of retaining plates 8 can be one and the retaining plates 8 is located at one side of the first avoidance hole 701 . Of course, the number of retaining plates 8 can also be multiple, and the multiple retaining plates 8 are arranged circumferentially around the first avoidance hole 701 .

[0235] Please refer to the attached Fig. 20 There are two retaining sheets 8, each retaining sheet 8 extends along the length direction of the active material coating portion 32, and the two retaining sheets 8 are arranged in the thickness direction of the active material coating portion 32, that is, the two retaining sheets 8 are arranged in the width direction of the pole body 21, and the position between two adjacent retaining sheets 8 is arranged opposite to the first avoidance hole 701 of the insulating film 7 for the conductive portion 33 to pass through.

[0236] In the above technical scheme, by connecting and setting a retaining sheet 8 on the insulating film 7, the rigidity of the insulating film 7 at the first avoidance hole 701 can be increased. On the one hand, the barrier effect between the portion of the conductive part 33 passing through the first avoidance hole 701 and the active material coating portion 32 can be enhanced, further reducing the probability of the conductive part 33 being invertedly inserted into the active material coating portion 32. On the other hand, the closing section 331 of the conductive part 33 can be kept in a retracted shape, further reducing the probability of the portion of the conductive part 33 passing through the first avoidance hole 701 being invertedly inserted into the closing section 331 of the conductive part 33, thereby greatly reducing the risk of short circuit in the battery cell 102.

[0237] Please refer to the attached Fig.17 , Figure 20-Figure 22 In an embodiment where the first avoidance hole 701 itself is a normally open hole adapted to the thickness of the conductive part 33, the retaining sheet 8 can cover at least part of the outside of the insulating film 7 and be connected to the insulating film 7, or, one side edge of the retaining sheet 8 can be connected to the hole edge of the first avoidance hole 701 and the other side extends toward the direction close to the center of the first avoidance hole 701.

[0238] Please refer to the attached Fig.18 , and further refer to Figure 23-Figure 25 , Fig.23 Schematic diagrams of the structure of the electrode component 3 and the insulating film 7 of the battery cell 102 in some other embodiments of the present application; Fig.24 for Fig.23 A top view of the structure shown in ; Fig.25 for Fig.23 In the embodiment where the first avoidance hole 701 is formed by tearing the tear structure 702 under the action of the conductive part 33, the retaining sheet 8 can cover the area where the tear structure 702 is located on the insulating film 7 and be connected to the insulating film 7.

[0239] In an embodiment of the present application, a pressure relief device 6 is provided on the mounting wall 111, and a rupture structure 703 can be provided at a position relative to the insulating film 7 and the pressure relief device 6. The rupture structure 703 and the above-mentioned tearing structure 702 can be shaped. When the pressure relief device 6 is opened, the rupture structure 703 can be opened more smoothly, which is conducive to exhaust.

[0240] Among them, one pole component 2 may be arranged on the installation wall 111, and the pressure relief device 6 and the pole component 2 may be arranged at intervals in the length direction of the installation wall 111. Two pole components 2 may also be arranged on the installation wall 111, and the two pole components 2 and the pressure relief device 6 may be arranged at intervals in the length direction of the installation wall 111, and the pressure relief device 6 may be located between the two pole components 2.

[0241] Please refer again Figure 4 and Figure 5 In an embodiment of the present application, the avoidance hole includes a second avoidance hole 901, and the second avoidance hole 901 is arranged opposite to the first avoidance hole 701, so that the conductive part 33 can pass through the first avoidance hole 701 and the second avoidance hole 901, so that the conductive part 33 can be electrically connected to the pole body 21.

[0242] The insulating member also includes an insulating bracket 9, which includes a bracket body 91. The bracket body 91 is arranged at one end of the active material coating part 32 close to the mounting wall 111, and the bracket body 91 covers at least a portion of the insulating film 7 on the end of the active material coating part 32 facing the mounting wall 111. The second avoidance hole 901 is opened in the bracket body 91, and the conductive part 33 passes through the first avoidance hole 701 and is in the second avoidance hole 901 or passes through the second avoidance hole 901, so that the conductive part 33 can be connected to the pole body 21, that is, the part where the conductive part 33 is connected to the pole body 21 can be located in the second avoidance hole 901 or outside the second avoidance hole 901.

[0243] In the above technical solution, the bracket body 91 can support the active material coating part 32, and can also isolate the active material coating part 32 from the mounting wall 111 of the shell component 1, thereby reducing the probability of the active material coating part 32 contacting the mounting wall 111, thereby reducing the risk of the mounting wall 111 of the shell component 1 being corroded due to the active material coating part 32 being exposed, reducing the risk of liquid leakage, and then improving the reliability and stability of the battery cell 102.

[0244] The number of the second avoidance holes 901 provided on the bracket body 91 is related to the number of the pole parts 2 on the mounting wall 111 of the shell part 1 and the number of the conductive parts 33 of the electrode part 3 arranged opposite to the mounting wall 111. If the mounting wall 111 of the shell part 1 is provided with one pole part 2 and the position of the electrode part 3 opposite to the mounting wall 111 has one conductive part 33, then one second avoidance hole 901 is provided on the insulating bracket 9; if the mounting wall 111 of the shell part 1 is provided with two pole parts 2 and the position of the electrode part 3 opposite to the mounting wall 111 has two conductive parts 33, then two second avoidance holes 901 are provided on the insulating bracket 9, and the two second avoidance holes 901 correspond to the positions of the two pole parts 2 one by one, so that the two conductive parts 33 on the same side of the electrode part 3 can be arranged one by one through the two second avoidance holes 901 of the insulating bracket 9, and are electrically connected one by one with the pole bodies 21 of the two pole parts 2 on the mounting wall 111.

[0245] Please refer to Figure 26-Figure 28 , Fig.26 It is a schematic structural diagram of the insulating bracket 9 of the battery cell 102 in some embodiments of the present application; Fig. 27 An assembly diagram of the insulating bracket 9 and the electrode component 3 of the battery cell 102 of some embodiments of the present application; Fig.28 Another assembly diagram of the insulating support 9 and the electrode component 3 of the battery cell 102 of some embodiments of the present application. In the embodiment of the present application, the second avoidance hole 901 has a first hole wall 9011 and a second hole wall 9012, and 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 second direction F2 shown in the figure, i.e., the thickness direction of the active material coating portion 32).

[0246] The insulating bracket 9 also includes a first separator 92, which is arranged at the first hole wall 9011 and connected to the bracket body 91. The first separator 92 extends toward the center of the second avoidance hole 901, and the first separator 92 is blocked between the first extension section 332 and the approach section 331.

[0247] For ease of understanding, it can be defined that the first separator 92 has a first side edge and a second side edge that are relatively arranged in the second direction F2, the second side edge of the first separator 92 is arranged closer to the center of the second avoidance 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 avoidance hole 901, the conductive part 33 at least partially passes through the first avoidance hole 701, the conductive part 33 is at the second avoidance hole 901 or passes through the second avoidance hole 901, and is connected to the pole body 21.

[0248] Therefore, by setting the first separator 92 at the second avoidance hole 901, the first separator 92 can be used to block the portion of the conductive part 33 extending out of the first avoidance hole 701 and the active material coating part 32, thereby reducing the probability of the conductive part 33 being inverted 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.

[0249] The first partition sheet 92 abuts against the first extension section 332 and / or the approaching section 331 .

[0250] When assembling the battery cell 102, the conductive part 33 of the electrode component 3 can be first passed through the second avoidance hole 901 of the insulating bracket 9, and then the conductive part 33 can be connected to the pole component 2, and finally the pole component 2 connected with the electrode component 3 can be connected to the shell component 1; or the conductive part 33 of the electrode component 3 can be first connected to the pole component 2, and then the conductive part 33 and the pole component 2 can be passed through the second avoidance hole 901 of the insulating bracket 9, and finally the pole component 2 passed through the second avoidance hole 901 can be connected to the shell component 1. Of course, based on the specific structure of the shell component 1, the pole component 2 and the electrode component 3, other orders can also be used for assembly.

[0251] After the shell component 1, the pole component 2 and the electrode component 3 are combined, the conductive part 33 is arranged roughly in an "S" shape, and the first separator 92 of the insulating bracket 9 can press the first extension section 332 of the conductive part 33 toward one side of the active material coating part 32 and / or the approaching section 331. The first separator 92 abuts against the first extension section 332 toward the side of the active material coating part 32, and can support the first extension section 332 to reduce the possibility of the first extension section 332 moving toward the approaching section 331. The first separator 92 abuts against the approaching section 331, which can make the parts of the multiple pole ear sheets 311 at the approaching section 331 closer together, so that the approaching section 331 of the conductive part 33 can maintain a preset gathering shape and cannot disperse. Therefore, the first separator 92 can shape the conductive part 33 so that the conductive part 33 can maintain a preset bending shape.

[0252] In the above technical solution, an insulating bracket 9 is provided at one end of the active material coating portion 32 close to the mounting wall 111, and the conductive portion 33 can be shaped by using the first separator 92 of the insulating bracket 9, so that the conductive portion 33 can maintain a preset "S" shape, and can also be blocked between the first extension section 332 and the approach section 331, that is, between the first extension section 332 and the active material coating portion 32, and between the second extension section 333 and the active material coating portion 32, thereby reducing the probability of the conductive portion 33 being inverted into the active material coating portion 32 and the approach section 331 due to redundancy, thereby reducing the risk of short circuit of the battery cell 102, and helping to improve the reliability of the battery cell 102.

[0253] Please refer again Figure 5 In the embodiment of the present application, the first partition sheet 92 abuts against the first extension section 332 .

[0254] like Fig. 27 As shown, in the width direction of the pole body 21 (such as Fig. 27 In the second direction F2 shown in FIG. 1 , the size of the overlapping area between the first separator 92 and the first extension section 332 is larger than half the size of the first extension section 332 and smaller than the size of the first extension section 332 .

[0255] The "overlapping area" here refers to the part where the projection of the first separator 92 on the plane perpendicular to the height direction of the active material coating portion 32 overlaps with the projection of the first extension section 332 on the plane. Specifically, the size of the overlapping area of ​​the first separator 92 and the first extension section 332 in the width direction of the pole body 21 is L1, and the size of the first extension section 332 in the width direction of the pole body 21 is L2, L1 is greater than half of L2, and L1 is less than L2, for example, L1 can be 0.6, 0.7, 0.8, 0.9 times of L2.

[0256] In the above technical solution, by limiting the size of the overlapping area between the first separator 92 and the first extension section 332 to meet the above range, the first separator 92 can effectively support the first extension section 332, thereby improving the reliability of the conductive part 33 in the preset bending shape.

[0257] Please refer again Fig. 27 and Fig.28 In an embodiment of the present application, the first separator 92 abuts against the approaching section 331 , and the first separator 92 horizontally extends from the first hole wall 9011 to the second hole wall 9012 , or the first separator 92 extends obliquely toward the direction close to the active material coating portion 32 .

[0258] Since the multiple pole ear pieces 311 of the conductive part 33 are close to each other at the closing section 331 to form a structure with a certain slope, by setting the first separator 92 to the above structure, after the conductive part 33 is inserted into place, the first separator 92 and the closing section 331 of the conductive part 33 are pressed against each other, so that the parts of the multiple pole ear pieces 311 at the closing section 331 are closer together, so that the closing section 331 of the conductive part 33 can maintain a preset gathering shape and cannot disperse, thereby further reducing the probability of the first extension section 332, the second extension section 333, or even the second bending section 3330 of the conductive part 33 being inverted into the closing section 331 and the active material coating part 32.

[0259] In addition, such a configuration can reduce the internal space occupied by the first separator 92 away from the second avoidance hole 901 away from the active material coating part 32, and reserve a larger placement space for the first extension section 332, the second extension section 333, the second bending section 3330 of the conductive part 33, and even the pole part 2, which is beneficial to reducing 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.

[0260] In an embodiment of the present application, the thickness of the first separator 92 is smaller than the thickness of the bracket body 91 , which can reduce the space occupied by the first separator 92 in the second avoidance hole 901 , thereby reserving a larger placement space for the conductive part 33 and even the pole component 2 , which is beneficial to improving the energy density of the electrode component 3 .

[0261] For example, the side of the first separator 92 close to the active material coating portion 32 can be further away from the active material coating portion 32 than the side of the bracket body 91 close to the active material coating portion 32. This can reduce the internal space occupied by the first separator 92 near the second avoidance hole 901 near the active material coating portion 32, and reserve placement space for the root (the approaching section 331) of the conductive portion 33 close to the active material coating portion 32.

[0262] For example, the side of the first separator 92 away from the active material coating portion 32 can be closer to the active material coating portion 32 than the side of the bracket body 91 away from the active material coating portion 32. In this way, the first separator 92 can reduce the internal space occupied by the second avoidance hole 901 away from the active material coating portion 32, and reserve a larger placement space for the first extension section 332, the second extension section 333, the second bending section 3330 of the conductive portion 33, and even the pole component 2.

[0263] Please refer again Fig.26The size of the first separator 92 in the length direction of the pole body 21 is smaller than the size of the second avoidance hole 901 in the length direction of the pole body 21. Fig.26 The two sides in the third direction F3 (ie, the width direction of the active material coating portion 32 ) shown are separated from the hole wall of the second avoidance hole 901 so that the first separator 92 can be deformed under the pressure of the conductive portion 33 .

[0264] 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 (such as the pressure of the conductive part 33), so that the first separator 92 can be deformed according to the closing section 331 and press the closing section 331, so that the multiple pole ear pieces 311 of the conductive part 33 are closer together at the closing section 331, so that the conductive part 33 can maintain the preset gathering shape and cannot disperse.

[0265] The first separator 92 may be made of a relatively soft material, so that the first separator 92 can be deformed under the action of the conductive portion 33 , so that the shape of the first separator 92 can be similar to the close section 331 of the conductive portion 33 .

[0266] In the embodiment of the present application, in the length direction of the pole body 21 (the third direction F3 as shown in the figure), the size of the first separator 92 is greater than or equal to the size of the conductive portion 33 .

[0267] In the above technical scheme, by controlling the size of the first separator 92 in the length direction of the pole body 21 to meet the above conditions, the first separator 92 can be made to extend beyond the conductive part 33 on both sides of the length direction of the pole body 21. In this way, the first separator 92 can completely separate the first extension section 332 and the second extension section 333 from the active material coating section 32, which can greatly reduce the probability of the first extension section 332 and the second extension section 333 of the conductive part 33 being inverted into the active material coating section 32 due to redundancy, further reducing the risk of short circuit in the battery cell 102, and reducing 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 pole 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.

[0268] Please refer to Figure 29-Figure 32 , Fig.29 It is a schematic structural diagram of the insulating bracket 9 of the battery cell 102 in some embodiments of the present application; Fig.30 for Fig.29 A structural cross-sectional view of the insulating bracket 9 of the battery cell 102 shown in FIG. Fig.31An assembly diagram of the insulating bracket 9 and the electrode component 3 of the battery cell 102 of some embodiments of the present application; Fig.32 Another assembly diagram of the insulating support 9 and the electrode component 3 of the battery cell 102 of some embodiments of the present application. In the embodiment of the present application, the insulating support 9 further includes a second separator 93, which is disposed at the second hole wall 9012 and connected to the support body 91, and extends toward the center of the second avoidance hole 901.

[0269] The second separator 93 is spaced apart from the first separator 92, and a through hole 902 is formed between the second separator 93 and the first separator 92. The through hole 902 is connected to the second avoidance hole 901, and the conductive part 33 is passed through the through hole 902. The second separator 93 is blocked between the second extension section 333 and the first extension section 332, or between the second extension section 333 and the approaching section 331.

[0270] In the above technical solution, by setting the insulating bracket 9 to include a first separator 92 and a second separator 93, the first separator 92 and the second separator 93 can be used to block the portion of the conductive part 33 extending out of the perforation 902 and the active material coating part 32, thereby further reducing the probability of the conductive part 33 being inverted 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.

[0271] Among them, the second separator 93 abuts against the first extension section 332 and / or the close section 331. After the shell part 1, the pole part 2 and the electrode part 3 are combined, the conductive part 33 is arranged roughly in an "S" shape. The second separator 93 of the insulating bracket 9 can press the side of the first extension section 332 of the conductive part 33 away from the active material coating part 32 and / or the close section 331. The second separator 93 abuts against the side of the first extension section 332 away from the active material coating part 32, which can reduce the possibility of the first extension section 332 moving in the direction close to the second extension section 333. The second separator abuts against the close section 331, which can make the parts of the multiple pole tabs 311 at the close section 331 closer together, so that the close section 331 of the conductive part 33 can maintain a preset gathering shape and cannot be dispersed. Therefore, the second separator 93 can shape the conductive part 33 so that the conductive part 33 can maintain a preset bending shape.

[0272] In the above technical solution, the second separator 93 of the insulating bracket 9 can be used to shape the conductive part 33 so that the conductive part 33 can maintain a preset "S" shape, and can also be blocked between the second extension section 333 and the approach section 331, that is, blocked between the second extension section 333 and the active material coating part 32, thereby reducing the probability of the conductive part 33 being inverted into the active material coating part 32 and the approach section 331 due to redundancy, thereby reducing the risk of short circuit in the battery cell 102 and improving the reliability of the battery cell 102.

[0273] In the embodiment of the present application, the second separator 93 abuts against the approaching section 331 , and the second separator 93 horizontally extends from the second hole wall 9012 to the first hole wall 9011 , or the second separator 93 extends obliquely toward the direction approaching the active material coating portion 32 .

[0274] Since the multiple pole ear pieces 311 of the conductive part 33 are close to each other at the closing section 331 to form a structure with a certain slope, by setting the second separator 93 to the above structure, after the conductive part 33 is inserted into place, the second separator 93 and the closing section 331 of the conductive part 33 are pressed against each other, so that the parts of the multiple pole ear pieces 311 at the closing section 331 are closer together, so that the closing section 331 of the conductive part 33 can maintain a preset gathering shape and cannot disperse, thereby further reducing the probability of the conductive part 33 passing through the through hole 902 and being inserted into the closing section 331 of the conductive part 33 and the active material coating part 32.

[0275] In addition, such a configuration can reduce the internal space of the second avoidance hole 901 away from the active material coating part 32 occupied by the second separator 93, and reserve a larger placement space for the first extension section 332, the second extension section 333, the second bending section 3330 of the conductive part 33, and even the pole part 2, which is beneficial to reducing 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.

[0276] In the embodiment of the present application, the dimension of the through hole 902 in the width direction of the pole body 21 is greater than or equal to the thickness of the conductive portion 33 .

[0277] In the above technical solution, by limiting the size of the through hole 902 in the width direction of the pole body 21 to meet the above conditions, the conductive part 33 can smoothly pass through the through hole 902, reducing the scratches on 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.

[0278] Among them, the position of the through hole 902 between the first separator 92 and the second separator 93 can be aligned with the retracted position of the multiple pole tabs 311 of the conductive part 33 adjacent to the active material coating part 32, and the position of the through hole 902 between the first separator 92 and the second separator 93 can be adjusted according to the retracted position of the multiple pole tabs 311 of the conductive part 33 adjacent to the active material coating part 32.

[0279] For example, if the folded position of the multiple pole tabs 311 of the conductive part 33 adjacent to the active material coating part 32 is aligned with the middle of the active material coating part 32 in the width direction, then the through hole 902 formed between the first separator 92 and the second separator 93 can be aligned with the middle of the active material coating part 32 in the width direction.

[0280] For another example, if the folded position of the multiple pole tabs 311 of the conductive portion 33 adjacent to the active material coating portion 32 is eccentrically disposed relative to the middle of the active material coating portion 32 in the width direction, then the through hole 902 formed between the first separator 92 and the second separator 93 can be eccentrically disposed relative to the middle of the active material coating portion 32 in the width direction.

[0281] Please refer again Fig.29 In the embodiment of the present application, in the length direction of the pole body 21 , the size of the second separator 93 is greater than or equal to the size of the conductive portion 33 .

[0282] In the above technical scheme, by controlling the size of the second separator 93 in the length direction of the pole body 21 to meet the above conditions, the second separator 93 can be made to extend beyond the conductive part 33 on both sides of the length direction of the pole body 21 on both sides of the length direction of the pole body 21. In this way, the problem of local deformation caused by the second separator 93 pressing against a part of the conductive part 33 in the length direction of the pole body 21 can be reduced, 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.

[0283] Please refer again Fig.32 In the embodiment of the present application, in the width direction of the pole body 21 , the size of the overlapping area between the second separator 93 and the approaching section 331 is less than half the size of the approaching section 331 .

[0284] The "overlapping area" here refers to the part where the projection of the second separator 93 on the plane perpendicular to the height direction of the active material coating portion 32 overlaps with the projection of the approaching section 331 on the plane. Specifically, the size of the overlapping area of ​​the second separator 93 and the approaching section 331 in the width direction of the pole body 21 is L3, and the size of the approaching section 331 in the width direction of the pole body 21 is L4, and L3 is less than half of L4, for example, L3 can be 0.2, 0.3, or 0.4 times of L4.

[0285] In the above technical solution, by limiting the size of the overlapping area between the second separator 93 and the approaching section 331 to meet the above range, the approaching section 331 and the first extension section 332 of the conductive part 33 can maintain a preset shape, so that the bending shape of the conductive part 33 can be controlled.

[0286] The thickness of the second separator 93 is less than that of the bracket body 91, so that the space occupied by the second separator 93 in the second avoidance hole 901 can be reduced, thereby reserving a larger placement space for the conductive part 33 and even the pole part 2, which is conducive to improving the energy density of the electrode part 3. The second separator 93 is separated from the hole wall of the second avoidance hole 901 on both sides of the length direction of the pole body 21 (the third direction F3 shown in the figure, that is, 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.

[0287] The following describes the assembly process of the battery cell 102 of the embodiment of the present application. Fig.33 , Fig.33 for Fig.32 , in the embodiment where the mounting wall 111 is a wall body opposite to the shell body 11 and the shell cover 12, the insulating bracket 9 can be pre-installed in the shell body 11, and the insulating bracket 9 abuts against the inner surface of the mounting wall 111. Before the electrode assembly 31 coated with the insulating film 7 is installed in the shell part 1, the first separator 92 and the second separator 93 of the insulating bracket 9 are inclined relative to the thickness direction of the mounting wall 111. Please refer to Fig.34 and Fig.35 , Fig.34 This is a schematic structural diagram of the electrode component 3 of the battery cell 102 of some embodiments of the present application being installed in the housing component 1 and before the insulating bracket 9 is deformed. Fig.35Schematic diagram of the structure of the battery cell 102 of some embodiments of the present application after the electrode component 3 is installed in the shell component 1 and the insulating bracket 9 is deformed. During the process of installing the electrode assembly 31 coated with the insulating film 7 into the shell component 1, the conductive part 33 can pass through the through hole 902 between the first separator 92 and the second separator 93. When the active material coating part 32 abuts against the bracket body 91, the first separator 92 and the second separator 93 can also be pushed to deform toward the side away from the active material coating part 32, thereby forming a Fig.35 Please refer to the structure shown in Fig.36 and Fig.37 , Fig.36 for Fig.35 The schematic diagram of the local structure of the battery cell 102 when the conductive part 33 is connected to the pole component 2 shown in FIG. Fig.37 for Fig.35 Schematic diagram of the local structure when the pole component 2 of the battery cell 102 is connected to the shell component 1, after the active material coating part 32 is installed in the shell component 1, the conductive part 33 extends from the through hole 902, and then the conductive part 33 is connected to the pole component 2, the pole component 2 is turned over to cover the mounting hole 112 on the mounting wall 111, and finally the pole component 2 is connected to the mounting wall 111, so that the battery cell 102 can be assembled.

[0288] Please refer to Figure 38-Figure 41 , Fig.38 A schematic diagram of a pole component 2 provided in some embodiments of the present application; Fig.39 for Fig.38 A top view of the pole component 2 shown in FIG. Fig.40 For along Fig.39 The view from direction B shown in FIG. Fig.41 For along Fig.39 Cross-sectional view along the CC line; in some embodiments of the present application, the pole component 2 includes a pole body 21, a transition structure 22 and an insulating structure 23, the transition structure 22 surrounds the pole body 21, and the transition structure 22 is connected to the mounting wall 111, the insulating structure 23 is insulated and fitted between the transition structure 22 and the pole body 21, and the electrode component 3 is connected to the pole body 21.

[0289] The adapter structure 22 surrounds the entire circumference of the pole body 21 along the circumference of the mounting hole 112, so that the adapter structure 22 can play a role in connecting the pole body 21 and the mounting wall 111 in the outer peripheral area of ​​the pole body 21, and the insulating structure 23 insulates the matching position of the adapter structure 22 and the pole body 21 to prevent the pole body 21 and the adapter structure 22 from being electrically short-circuited. Among them, the connection method between the adapter structure 22 and the mounting wall 111 is not limited, for example, it can be welding, riveting, punching, bonding, etc. In addition, the pole body 21 is connected to the electrode component 3, and the electrode component 3 can be connected to the pole body 21 through the conductive part 33, and the connection method between the conductive part 33 and the pole body 21 is not limited, for example, it can be welding, riveting, punching, bonding, etc.

[0290] In the above technical solution, the pole component 2 has a simple structure and is easy to process. Since it includes two parts, namely the pole body 21 and the adapter structure 22, the shape and size of the pole body 21 and the shape and size of the adapter structure 22 can be designed separately based on different factors, so as to flexibly adapt to the connection requirements with different forms of shell components 1 and electrode components 3, thereby increasing the scope of application of the pole component 2.

[0291] Exemplarily, the adapter structure 22 can be set to match the shape of the mounting hole 112, and the shape of the mounting hole 112 can be designed to be a long strip that is convenient for the pole component 2 to pass through and makes the flipping angle of the pole component 2 smaller. At the same time, the pole body 21 can be designed to be a long strip that matches the shape of the adapter structure 22, so that the pole body 21 has a larger area to connect with the conductive part 33, or the pole body 21 can be designed to be a circle that does not match the shape of the adapter structure 22, so as to help reduce the connection area between the pole body 21 and the adapter structure 22, improve the force uniformity at the connection between the pole body 21 and the adapter structure 22, and thus improve the connection reliability between the pole body 21 and the adapter structure 22.

[0292] In some embodiments of the present application, the adapter structure 22 is formed into a long strip (such as a rectangle or a racetrack) extending along the length direction of the installation wall 111, and the contour shape of the pole body 21 matches the contour shape of the adapter structure 22 (such as a rectangle or a racetrack). As mentioned above, the electrode component 3 is connected to the pole component 2 through the conductive portion 33. When the contour shape of the pole body 21 is formed into a long strip matching the contour shape of the adapter structure 22, the area of ​​the pole body 21 is large, which is conducive to increasing the connection area between the conductive portion 33 and the pole body 21, thereby improving the conductive performance.

[0293] Please refer to Fig.38In some other embodiments of the present application, the adapter structure 22 is formed into a long strip (such as a rectangular or runway shape) extending along the length direction of the installation wall 111, and the pole body 21 is arranged at the length center position of the adapter structure 22 and is circular. Therefore, when the pole body 21 is arranged at the length center position of the long strip 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 force uniformity at the connection between the pole body 21 and the adapter structure 22, and thus improve the connection reliability between the pole body 21 and the adapter structure 22.

[0294] Please refer to Figure 38-Figure 41 In some embodiments of the present application, the insulating structure 23 is also sealed and matched between the adapter structure 22 and the pole body 21. Therefore, the insulating structure 23 can not only insulate the adapter structure 22 from the pole body 21, but also make the matching position of the adapter structure 22 and the pole body 21 present a sealed state, so as to isolate the inside and outside of the shell component 1 after the adapter structure 22 is connected to the mounting wall 111, reduce the risk of the electrolyte in the shell component 1 leaking from the matching position of the adapter structure 22 and the pole body 21 to the outside of the shell component 1, and reduce the risk of liquid or dust outside the shell component 1 entering the shell component 1 from the matching position of the adapter structure 22 and the pole body 21, thereby improving the reliability of the battery cell 102.

[0295] In the above technical solution, since the insulating structure 23 is also sealed and matched between the transition structure 22 and the pole body 21, when the pole component 2 is installed on the installation wall 111 and the transition structure 22 and the installation wall 111 are connected, there is no need to set a seal between the transition structure 22 and the installation wall 111, and there is no need to apply a large sealing pressure to meet the compression degree of the seal there, so that the force on the installation wall 111 can be reduced, which plays a role in protecting the shell component 1, thereby helping to reduce the wall thickness of the shell component 1 and reduce material costs. Moreover, since the installation wall 111 is the end of the shell body 11 opposite to the opening 113, the force at the connection between the installation wall 111 and the peripheral wall 114 can be reduced, and the force on the peripheral wall 114 can be reduced, which is conducive to ensuring the reliability of the shell body 11 and reducing the wall thickness and cost of the shell body 11.

[0296] Please refer again Figure 38-Figure 41 In some embodiments of the present application, the insulating structure 23 includes a sealing structure 231. In the embodiments of the present application, the sealing structure 231 is made of a material having both sealing and insulating properties, such as an elastic rubber member.

[0297] Please refer again Figure 38-Figure 41 Exemplarily, at least a portion of the sealing structure 231 is clamped between the transition structure 22 and the pole body 21 in the inner and outer directions (eg, the fifth direction F5 ) of the mounting wall 111 .

[0298] In the embodiment of the present application, the direction from the inner side of the mounting wall 111 to the outer side of the mounting wall 111, and the direction from the outer side of the mounting wall 111 to the inner side of the mounting wall 111, are collectively referred to as “inside-outside directions of the mounting wall 111 (e.g., the fifth direction F5)”. “Inside of the mounting wall 111” refers to the side of the mounting wall 111 facing the electrode component 3, and “outside of the mounting wall 111” refers to the side of the mounting wall 111 facing away from the electrode component 3.

[0299] The sealing structure 231 at least includes a shaft side portion 231a, the side of the shaft side portion 231a facing the accommodating cavity 13 is the inner side of the shaft side portion 231a, and the side of the shaft side portion 231a away from the electrode component 3 is the outer side of the shaft side portion 231a, and one of the transition structure 22 and the pole body 21 is partially clamped on the outer side of the shaft side portion 231a, and the other part is clamped on the inner side of the shaft side portion 231a, so that the shaft side portion 231a is clamped between the transition structure 22 and the pole body 21 in the inner and outer directions of the mounting wall 111 (for example, the fifth direction F5) to achieve axial sealing between the transition structure 22 and the pole body 21.

[0300] Thus, by setting at least part of the sealing structure 231 to be clamped between the transition structure 22 and the pole body 21 in the inner and outer directions (e.g., the fifth direction F5) of the mounting wall 111, an axial seal between the transition structure 22 and the pole body 21 is achieved, and the axial seal can achieve a more reliable sealing effect, thereby improving the leakage problem at the matching position of the transition structure 22 and the pole body 21. Moreover, the embodiment of the present application can reduce the axial force on the mounting wall 111 by integrating the axial seal (e.g., the shaft side portion 231a) into the pole component.

[0301] Please refer again Figure 38-Figure 41 Exemplarily, the sealing structure 231 is arranged around the peripheral side of the adapter structure 22 facing the pole body 21 (i.e., the inner ring of the adapter structure 22). In the embodiment of the present application, since the adapter structure 22 is arranged around the pole body 21 and connected to the mounting wall 111, the peripheral side of the adapter structure 22 facing the pole body 21 is the "inner ring 2211 of the adapter structure 22", and the peripheral 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 arranging the sealing structure 231 around the inner ring of the adapter structure 22, the sealing structure 231 can be close to the matching position of the adapter structure 22 and the pole body 21, which is conducive to sealing the matching position of the adapter structure 22 and the pole body 21 in a shorter path, improving the reliability of the seal, and is conducive to reducing the size of the sealing structure 231, reducing the sealing area, and easily realizing compression sealing thereof, and the seal is not easy to fail, thereby improving the sealing effect.

[0302] In addition, when the insulating structure 23 includes a sealing structure 231, the sealing structure 231 is clamped between the transition structure 22 and the pole body 21 so that the transition structure 22 and the pole body 21 are sealed together, and the transition structure 22 is formed into a long strip extending along the length direction of the mounting wall 111, and the pole body 21 is arranged at the length center position of the transition structure 22 and is circular, since the connection position between the transition structure 22 and the pole body 21 is subjected to uniform force, it is easy to control the compression amount of the sealing structure 231 to improve the reliability of the sealing cooperation between the transition structure 22 and the pole body 21, and the sealing area is relatively small and not easy to fail.

[0303] Please refer again Figure 38-Figure 41 In some embodiments of the present application, the pole body 21 includes a peripheral portion 212, and the transition structure 22 is clamped on both sides of the peripheral portion 212 in the inner and outer directions of the mounting wall 111 through the insulating structure 23, and 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 transition structure 22.

[0304] 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 peripheral side 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 .

[0305] 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 accommodating 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 limit the movement of the pole 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 limit the movement of the pole body 21 relative to the transition structure 22 toward the accommodating cavity 13, thereby achieving the transition structure 22 being clamped on both sides of the peripheral portion 212 in the inner and outer directions of the mounting wall 111 (for example, the fifth direction F5) through the insulating structure 23.

[0306] In the above technical solution, the structure of the pole part 2 is simple and easy to process, and the relative fixation and insulation matching between the pole body 21 and the adapter structure 22 can be simply and effectively achieved. The peripheral portion 212 of the pole body 21 and the adapter structure 22 are used to clamp the sealing structure 231, so that the sealing structure 231 can be in the matching position of the adapter structure 22 and the pole body 21, which is conducive to sealing the matching position of the adapter structure 22 and the pole body 21 in a shorter path, improving the reliability of the seal, and is conducive to reducing the size of the sealing structure 231, reducing the sealing area, and easily achieving compression sealing on it, and the seal is not easy to fail, thereby improving the sealing effect. Moreover, since at least part of the sealing structure 231 is clamped between the side of the peripheral portion 212 facing the electrode part 3 and the adapter structure 22, the sealing structure 231 can be sealed from the side of the peripheral portion 212 facing the accommodating cavity 13, which can more effectively inhibit the electrolyte from leaking out of the matching position between the pole body 21 and the adapter structure 22, thereby improving the sealing effect.

[0307] Please refer again Fig.41 , illustratively, the insulating structure 23 further includes a first insulating member 232, and the transition structure 22 is clamped on both sides of the peripheral portion 212 along the inner and outer directions (e.g., the fifth direction F5) of the installation wall 111 by the first insulating member 232 and the sealing structure member 231. In this embodiment, the transition structure 22 is not limited in composition, and can be a single part or a combination of multiple parts (e.g., two or more).

[0308] Since at least a portion of the sealing structure 231 (such as the axial side portion 231a) is arranged on the side of the peripheral portion 212 facing the electrode component 3, at least a portion of the first insulating member 232 is arranged on the side of the peripheral portion 212 away from the electrode component 3, and the transition structure 22 can be clamped on both sides of the peripheral portion 212 along the inner and outer directions of the mounting wall 111 (for example, the fifth direction F5) through the first insulating member 232 and the sealing structure 231 respectively.

[0309] In the above technical solution, since the insulating structure 23 includes the first insulating member 232 and the sealing structure member 231 which are not integrated into one piece, the design and processing of the insulating structure 23 can be simplified. Moreover, according to the specific matching requirements with the pole body 21 and the adapter structure 22, the first insulating member 232 can be set as an insulating member that is basically incompressible and does not have a sealing effect (such as a plastic member), or the first insulating member 232 can be set as a compressible sealing member that has a sealing effect (such as an elastic rubber member), so as to meet different actual requirements. In addition, when the first insulating member 232 is an insulating member that is basically incompressible and does not have a sealing effect (such as a plastic member), it is easy to control the compression amount of the sealing structure member 231 and improve the sealing effect.

[0310] Alternatively, in some other embodiments of the present application, the sealing structure 231 can also be an integral structure and outsource the peripheral portion 212, so as to be respectively located on the side of the peripheral portion 212 facing the electrode component 3 and the side away from the electrode component 3, and 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 sealing structure 231. 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 respectively located on the inner and outer sides of the peripheral portion 212, so that 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 two axial side portions 231a of the sealing structure 231. In the above technical solution, since the sealing structure 231 is an integral structure and outsources the peripheral portion 212, the number of parts and the assembly process can be reduced.

[0311] Please refer again Figure 38-Figure 41 In some embodiments of the present application, the adapter structure 22 includes a first adapter ring 221 and a second adapter ring 222. The second adapter ring 222 is arranged 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 and fixedly matched with the peripheral portion 212 by the first insulating member 232.

[0312] For example, the first adapter ring 221 and the second adapter ring 222 can be welded, riveted, punched, or bonded. For example, the outer ring of one of the first adapter ring 221 and the second adapter ring 222 is welded, riveted, punched, or bonded to the mounting wall 111. Exemplarily, the first adapter ring 221 and the second adapter ring 222 are both made of aluminum and welded, and the first adapter ring 221 and the mounting wall 111 are both made of aluminum and welded, which is beneficial to improving the welding yield.

[0313] Therefore, the adapter structure 22 includes a first adapter ring 221 and a second adapter ring 222 which are arranged inside and outside and assembled and connected, so as to facilitate the assembly connection between the adapter structure 22 and the insulating structure 23 and the pole body 21, so that the pole component 2 is easy to process and manufacture, and it is easy to control the compression amount of the sealing structure 231, thereby improving the sealing reliability.

[0314] The second adapter ring 222 is insulated and fixedly matched with the peripheral portion 212 by the first insulating member 232 in any manner. Figure 38-Figure 41 The first insulating member 232 and the second adapter ring 222 can be connected by injection molding. Fig.42 , Fig.42 A cross-sectional view of a pole component provided for some embodiments of the present 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 inner and outer directions of the mounting wall 111 (for example, the fifth direction F5), wherein the material of the first insulating member 232 is not limited, for example, it may be a plastic member or an elastic rubber member.

[0315] Please refer again Fig.41 , exemplarily, the adapter structure 22 further includes a first insulating frame 224, and the first insulating frame 224 is connected to the side of the first adapter ring 221 facing the electrode component 3. Therefore, the first insulating frame 224 can be used to insulate between the electrode component 3 and the first adapter ring 221, reducing the difficulty of setting the insulation structure here. Exemplarily, the first insulating frame 224 has a plug, and the first adapter ring 221 has a socket, and the plug is inserted into the socket by interference fit to achieve the connection between the first insulating frame 224 and the first adapter ring 221.

[0316] Please refer to Fig.43 , Fig.43 A cross-sectional view of a pole component provided in some embodiments of the present application; in some embodiments of the present application, the adapter structure 22 includes a third adapter ring 223, and the third adapter ring 223 includes an integrally arranged inner extension portion 2231 and an outer extension portion 2232. That is, the inner extension portion 2231 and the outer extension portion 2232 are different parts of an integral piece, rather than two separate parts assembled and connected.

[0317] The end of the inner extension 2231 facing the pole body 21 (i.e., the inner ring of the inner extension 2231) and the end of the outer extension 2232 facing the pole body 21 (i.e., the inner ring of the outer extension 2232) are spaced in the inner and outer directions, so as to 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 insulating structure 23. The sealing structure 231 is clamped between the inner extension 2231 and the peripheral portion 212, and the outer extension 2232 is insulated and fixedly matched with the peripheral portion 212 by the first insulating member 232.

[0318] The third adapter ring 223 and the mounting wall 111 may be connected in any manner, such as welding, riveting, punching, bonding, etc. Exemplarily, the third adapter ring 223 and the mounting wall 111 are both made of aluminum and are welded, which is beneficial to improving welding yield.

[0319] The outer extension portion 2232 is insulated and fixedly matched with the peripheral portion 212 by the first insulating member 232 in any manner. Fig.43 The outer extension portion 2232 rivets the first insulating member 232 against the peripheral portion 212. For another example, please refer to Fig.44 , Fig.44 A cross-sectional view of a pole component provided in some embodiments of the present application; the first insulating member 232 and the pole body 21 , as well as the first insulating member 232 and the outer extension portion 2232 are respectively connected by injection molding, and the inner extension portion 2231 rivets the sealing structure 231 against the peripheral portion 212 .

[0320] For example, please refer again to Fig.44 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. Therefore, the second insulating frame 225 can be used to insulate between the electrode component 3 and the third adapter ring 223, eliminating the need to provide an insulating structure. Exemplarily, the second insulating frame 225 has a plug, and the third adapter ring 223 has a socket, and the plug is inserted into the socket by interference fit to achieve the connection between the second insulating frame 225 and the third adapter ring 223.

[0321] Please refer to Fig.45 and Fig.46 , Fig.45 A cross-sectional view of a battery cell 102 provided in some embodiments of the present application; Fig.46 A cross-sectional view of a battery cell 102 provided in some embodiments of the present application. In some embodiments of the present application, the adapter structure 22 includes a matching ring portion 2271, the pole body 21 includes a penetration portion 214 penetrated through the matching ring portion 2271, and an inner limiting portion 215 and an outer limiting portion 216 connected to the penetration portion 214 and clamped on both inner and outer sides of the matching ring portion 2271, and at least a portion of the sealing structure 231 is clamped between the matching ring portion 2271 and the inner limiting portion 215.

[0322] Exemplarily, the adapter structure 22 includes a fourth adapter ring 227, the fourth adapter ring 227 includes a matching ring portion 2271, and the fourth adapter ring 227 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, welding, riveting, punching, bonding, etc. Exemplarily, the fourth adapter ring 227 and the mounting wall 111 are both made of aluminum and are welded, which is conducive to improving the welding yield.

[0323] In the above technical solution, the structure of the pole component 2 is simple and easy to process, and the relative fixation and insulation matching of the pole body 21 and the adapter structure 22 can be simply and effectively achieved. The sealing structure 231 is clamped by the matching position of the pole body 21 and the matching ring part 2271, so that the sealing structure 231 can be in the matching position of the adapter structure 22 and the pole body 21, which is conducive to sealing the matching position of the adapter structure 22 and the pole body 21 in a shorter path, improving the reliability of the seal, and is conducive to reducing the size of the sealing structure 231, reducing the sealing area, and easily achieving compression sealing on it, and the seal is not easy to fail, thereby improving the sealing effect. Moreover, since at least part of the sealing structure 231 is clamped between the matching ring part 2271 and the inner limit part 215, the sealing structure 231 can be sealed from the side of the matching ring part 2271 facing the accommodating cavity 13, which can more effectively inhibit the electrolyte from leaking out of the matching position of the pole body 21 and the adapter structure 22, thereby improving the sealing effect.

[0324] Please refer again Fig.45 The insulating structure 23 may further include a second insulating member 234 , wherein at least a portion of the sealing structure member 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 .

[0325] In the above technical solution, since the insulating structure 23 includes the second insulating member 234 and the sealing structure 231 which are not integrated into one piece, the design and processing of the insulating structure 23 can be simplified. Moreover, according to the specific matching requirements with the pole body 21 and the adapter structure 22, the second insulating member 234 can be set as an insulating member that is basically incompressible and does not have a sealing effect (such as a plastic member), or the second insulating member 234 can be set as a compressible sealing member that has a sealing effect (such as an elastic rubber member), so as to meet different actual requirements. In addition, when the second insulating member 234 is an insulating member that is basically incompressible and does not have a sealing effect (such as a plastic member), it is easy to control the compression amount of the sealing structure 231 and improve the sealing effect.

[0326] Alternatively, please combine Fig.46In some other embodiments of the present application, the sealing structure 231 can also be an integral structure and surround the matching ring 2271, so as to be respectively located on the side of the matching ring 2271 facing the electrode component 3 and the side away from the electrode component 3, and the pole body 21 is clamped on both sides of the matching ring 2271 along the inner and outer directions (for example, the fifth direction F5) of the installation wall 111 through the sealing structure 231. 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 respectively located on the inner and outer sides of the matching ring 2271. In this way, the transition structure 22 can be clamped on both sides of the matching ring 2271 along the inner and outer directions (for example, the fifth direction F5) of the installation wall 111 through the two axial side portions 231a of the sealing structure 231. In the above technical solution, since the sealing structure 231 is an integral structure and surrounds the matching ring 2271, the number of parts and the assembly process can be reduced.

[0327] In an embodiment of the present application, when the pole body 21 includes a penetration portion 214, and an inner limiting portion 215 and an outer limiting portion 216 connected to the penetration portion 214 and clamped on both sides of the mating ring portion 2271, the structure of the pole body 21 is not limited, and it can be a single part or a combination of multiple parts (such as two or more).

[0328] For example, please refer again to Fig.45 , the outer limiting portion 216 and the penetration portion 214 are assembled and connected on the side of the matching ring portion 2271 away from the inner limiting portion 215. Among them, the method of assembling and connecting the outer limiting portion 216 and the penetration portion 214 is not limited, such as welding, punching, adhesive connection, etc., and the assembly connection refers to the connection of two parts together through a connection process. Therefore, the outer limiting portion 216 and the penetration portion 214 are set as separate parts and assembled and connected, and the structure of the pole body 21 is simple and easy to assemble and connect with the adapter structure 22. In addition, when the outer limiting portion 216 and the penetration portion 214 are welded, the thermal impact on the sealing structure 231 clamped between the inner limiting portion 215 and the matching ring portion 227 can be reduced, and the sealing reliability of the sealing structure 231 can be improved.

[0329] In the above embodiment, the connection method between the penetration portion 214 and the inner limiting portion 215 is not limited, and can be an integral part, or can be a split part and pre-connected together. Exemplarily, the end of the penetration portion 214 that is away from the inner limiting portion 215 can include a riveted portion 2141. During assembly, the penetration portion 214 can be penetrated along the direction from the inner limiting portion 215 to the outer limiting portion 216 through the matching ring portion 2271 with the insulating structure 23, and then the riveted portion 2141 is riveted to limit the penetration portion 214 from coming out along the direction from the outer limiting portion 216 to the inner limiting portion 215. After that, the riveted portion 2141 can be connected to the outer limiting portion 216, so as to facilitate the connection between the penetration portion 214 and the outer limiting portion 216, such as welding. Alternatively, the riveted portion 2141 can be omitted, and the riveting process after the penetration of the penetration portion 214 is omitted.

[0330] After the riveting process.

[0331] For example, please combine again Fig.46 In some other embodiments of the present application, the outer limiting portion 216 and the penetration portion 214 are an integral part, and the outer limiting portion 216 rivets the second insulating member 234 against the matching ring portion 2271. In the above technical solution, the assembly connection of the outer limiting portion 216 with 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 portion 216 is connected with the insulating structure 23 and the transition structure 22 on the sealing structure 231, thereby improving the sealing reliability of the sealing structure 231. In addition, by riveting the outer limiting portion 216 to press the second insulating member 234 against the matching ring portion 2271, it is easy to control the compression amount of the sealing structure 231 and achieve a better compression effect.

[0332] In the above embodiment, the connection method of the penetration portion 214 and the inner limiting portion 215 is not limited, and can be an integral piece, or can be a separate piece and pre-connected together. Exemplarily, during assembly, the penetration portion 214 can be penetrated by the matching ring portion 2271 matched 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 is riveted to limit the relative movement of the pole component 21 and the adapter structure 22.

[0333] The pole body 21 is a solid structure or a hollow structure. For example, when the pole body 21 is a hollow structure, please refer to Fig.46The pole body 21 includes a first pole piece 21a and a second pole piece 21b. The second pole piece 21b is composed of a penetration portion 214, an inner limiting portion 215 and an outer limiting portion 216, and is mounted on the mounting wall 111. The penetration portion 214 surrounds a matching hole 21b1 that penetrates along the inner and outer directions of the mounting wall 111. The first pole piece 21a is assembled on the side of the second pole piece 21b that is away from the electrode component 3 and covers the matching hole 21b1, so as to form a receiving space open toward the direction of the electrode component 3 between the first pole piece 21a and the second pole piece 21b. A part of the conductive part 33 can extend into the receiving space and be connected to the first pole piece 21a, so that the pole body 21 can play the role of accommodating the conductive part 33, so as to reduce the space occupied by the conductive part 33 in the receiving cavity 13, which is conducive to improving the energy density of the battery cell 102.

[0334] Please refer again Fig.45 In some embodiments of the present application, the adapter structure 22 further includes a third insulating frame 228, and the third insulating frame 228 is connected to the side of the fourth adapter ring 227 facing the electrode component 3. Therefore, the third insulating frame 228 can be used to insulate between the electrode component 3 and the fourth adapter ring 227, eliminating the need to set an insulating structure here. Exemplarily, the third insulating frame 228 has a plug, and the fourth adapter ring 227 has a socket, and the plug is inserted into the socket by interference fit to achieve the connection between the third insulating frame 228 and the fourth adapter ring 227.

[0335] Please refer to Fig.47 , Fig.47 A cross-sectional view of a battery cell provided in some embodiments of the present application; in some embodiments of the present application, a mounting hole 112 is provided on the mounting wall 111, and a sealing ring 14 is provided around the mounting hole 112, and the sealing ring 14 is clamped between the pole component 2 and the mounting wall 111. Therefore, the pole component 2 has a simple structure, is easy to process, and is easy to assemble and connect with the mounting wall 111.

[0336] In some embodiments of the present application, a mounting hole 112 is provided on the mounting wall 111, the pole component 2 covers 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 the transition structure 22 on one side of the mounting wall 111 in the wall thickness direction, that is, the transition structure 22 covers the outer side of the mounting wall 111, or covers the inner side of the mounting wall 111, the assembly of the transition structure 22 and the mounting wall 111 is facilitated.

[0337] Exemplarily, the adapter structure 22 is connected to the mounting wall 111 by welding. For example, after the adapter structure 22 is covered on the mounting wall 111, the adapter structure 22 and the mounting wall 111 can be connected by welding, so as to facilitate processing and better ensure the connection reliability 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 between the two 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), so as to facilitate the welding operation and increase the welding space. The present application is not limited to this. For example, in some other embodiments of the present application, the adapter structure 22 can also be set to be penetrated into the mounting hole 112 and riveted to the mounting wall 111.

[0338] Please refer to Fig.48 and Fig.49 , Fig.48 A partial cross-sectional view of a battery cell 102 provided in some embodiments of the present application, in which the pole component 2 is in a state before being covered by the mounting wall 111; Fig.49 for Fig.48 FIG. 2 is a diagram showing a state in which the pole component 2 is covered with the installation wall 111 .

[0339] Please refer to Fig.48 and Fig.49 In some embodiments, when the electrode component 3 is first connected to the pole component 2 and then the pole component 2 is assembled and connected to the mounting wall 111, after the electrode component 3 is connected to the pole component 2 (for example, the pole component 2 and the electrode component 3 can be connected first, then installed into the shell body 11 together, and then the pole component 2 is extended from the mounting hole 112 to the outside of the mounting wall 111; or for another example, the electrode component 3 is installed into the shell body 11, the conductive part 33 is passed through the mounting hole 112, and connected to the pole component 2 pre-arranged on the outside of the mounting wall 111), the pole component 2 is covered on the mounting hole 112 of the mounting wall 111 from the outside of the mounting wall 111 (that is, the side away from the active material coating part 32). At this time, the edge of the transition structure 22 overlaps the side of the mounting wall 111 away from the electrode component 3. Therefore, since the pole component 2 covers the installation wall 111 from the outside, it is convenient to assemble and connect the pole component 2 and the installation wall 111, which is beneficial to improve the connection reliability between the pole component 2 and the installation wall 111.

[0340] Please refer to Fig.48 and Fig.49In some embodiments of the present application, when the edge of the adapter structure 22 overlaps the side of the installation wall 111 away from the electrode component 3, the installation wall 111 may be provided with a first sinking groove 1111 arranged around the installation hole 112, the first sinking groove 1111 is open in the direction away from the electrode component 3 (that is, the first sinking groove 1111 is open in the direction away from the active material coating portion 32), and the edge of the adapter structure 22 is embedded in the first sinking groove 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 sinking groove 1111. Thus, it is convenient to support and position the connection between the adapter structure 22 and the installation wall 111, which is conducive to the welding connection between the two from the outside of the installation wall 111 (that is, the side away from the active material coating portion 32).

[0341] Please refer again Fig.48 and Fig.49 For example, the thickness of the flange portion 22a matches the groove depth T1 of the first groove 1111, where "matching" means that the thickness of the flange portion 22a is substantially consistent with the groove depth of the first groove 1111. Thus, it is convenient to weld the flange portion 22a to the mounting wall 111, the thickness of the flange portion 22a is not too large relative to the groove depth of the first groove 1111, and unnecessary space occupation can be reduced, and the thickness of the flange portion 22a is not too small relative to the groove depth of the first groove 1111, and the welding strength requirement can be met.

[0342] Fig.50 An exploded view of a portion of a battery cell 102 provided in some embodiments of the present application; Figure 48-Figure 50 In some embodiments of the present application, the mounting hole 112 is an elongated hole (e.g., a rectangle, an ellipse, or a racetrack shape, etc.), and the pole component 2 is formed into an elongated structure (e.g., a rectangle, an ellipse, or a racetrack shape, etc.) that matches the shape of the mounting hole 112. When the electrode component 3 is first connected to the pole component 2, and then the pole component 2 and the electrode component 3 are installed into the shell body 11, and then the pole component 2 is extended from the mounting hole 112 to the outside of the mounting wall 111, and then the pole component 2 is turned over from the outside of the mounting wall 111 to cover the pole component 2 at the mounting hole 112, and then the pole component 2 is connected to the mounting wall 111, if the pole component 2 is set to a long strip structure that matches the shape of the mounting hole 112, the pole component 2 can be adjusted to a thickness direction that is aligned with the width direction of the mounting hole 112 (e.g., Fig.50 After the pole component 2 passes through the mounting hole 112, the thickness direction of the pole component 2 is rotated to the thickness direction of the mounting wall 111 (for example, Fig.50The first direction F1) shown in the figure is close, so that the space required for the flipping movement of the pole component 2 is smaller, and the space required for the flipping of the pole component 2 can be reduced, which is beneficial to shortening the length of the conductive part 33, saving materials, and reducing costs. It can also reduce the redundancy of the conductive part 33 and reduce the space occupied by the conductive part 33 in the accommodating cavity 13, which is beneficial to improving the energy density of the battery cell 102.

[0343] Please refer to Fig.51 and Fig.52 , Fig.51 A partial cross-sectional view of a battery cell 102 provided in some embodiments of the present application, in which the pole component 2 is in a state before being covered by the mounting wall 111; Fig.52 for Fig.51 FIG. 2 is a diagram showing a state in which the pole component 2 is covered with the mounting wall 111 .

[0344] Please refer to Fig.51 and Fig.52 In some embodiments, when the electrode component 3 is first connected to the pole component 2 and then the pole component 2 is assembled and connected to the mounting wall 111, the electrode component 3 and the pole component 2 can be installed together into the shell body 11 after the electrode component 3 and the pole component 2 are connected, so that the pole component 2 can be covered at the mounting hole 112 of the mounting wall 111 from the inner side of the mounting wall 111 (i.e., the side facing the active material coating portion 32), and at this time, the edge of the transition structure 22 overlaps the side of the mounting wall 111 facing the electrode component 3. Therefore, since the pole component 2 is arranged at the mounting hole 112 from the inner side of the mounting wall 111, the electrode component 3 and the pole component 2 can be installed together into the shell body 11, and the pole component 2 does not need to pass through the mounting hole 112, thereby reducing the operation steps and reducing the difficulty of operation.

[0345] Please refer to Fig.51 and Fig.52 In some embodiments of the present application, when the edge of the adapter structure 22 overlaps the side of the mounting wall 111 facing the electrode component 3, the edge of the adapter structure 22 has a second recessed groove 22b that is open in the direction away from the electrode component 3 (that is, the second recessed groove 22b is open in the direction away from the active material coating portion 32), and the mounting wall 111 includes an overlapped portion 1112 protruding into the mounting hole 112, and the overlapped portion 1112 is embedded in the second recessed groove 22b. As a result, it is convenient to support and position the connection between the pole component 2 and the mounting wall 111, which is conducive to the welding connection between the two from the outside of the mounting wall 111 (that is, the side away from the active material coating portion 32).

[0346] Please refer again Fig.51 and Fig.52, exemplarily, the thickness of the overlap portion 1112 matches the groove depth T2 of the second sink groove 22b, wherein "matching" means that the thickness of the overlap portion 1112 is substantially consistent with the groove depth of the second sink groove 22b. Thus, it is convenient to weld the overlap portion 1112 to the mounting wall 111, the thickness of the overlap portion 1112 is not too large relative to the groove depth of the second sink groove 22b, which can reduce unnecessary space occupation, and the thickness of the overlap portion 1112 is not too small relative to the groove depth of the second sink groove 22b, which can meet the welding strength requirements.

[0347] In some embodiments of this application, please refer to Figure 5 , the pole component 2 forms a first receiving groove 201 which is recessed in the direction away from the electrode component 3 relative to the mounting wall 111 and is open in the direction of the electrode component 3, the electrode component 3 is connected to the pole component 2 through the conductive portion 33, at least part of the conductive portion 33 is accommodated in the first receiving groove 201 and is connected to the pole body 21. That is, the pole component 2 forms a first receiving groove 201, the groove wall of the first receiving groove 201 is formed by the pole component 2, the first receiving groove 201 is recessed in the direction away from the active material coating portion 32, and the first receiving groove 201 is open in the direction of the active material coating portion 32, so that the first receiving groove 201 is connected to the receiving cavity 13.

[0348] Thus, by providing the first receiving groove 201 to receive the conductive part 33, the space occupied by the conductive part 33 in the receiving chamber 13 can be reduced, so that the receiving chamber 13 has a larger space to receive the active material coating part 32, which is beneficial to increase 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 toward the electrode component 13, the conductive part 33 can be easily inserted into the first receiving groove 201, reducing the difficulty of operation.

[0349] For example, please refer again to Figure 5 The first receiving groove 201 is formed on the side of the pole body 21 and the transition structure 22 facing the electrode component 3 (i.e., the side facing the active material coating portion 32), and the transition structure 22 is raised 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.

[0350] Therefore, by processing the adapter structure 22 into a protruding bulge, a portion of the first accommodating groove 201 is formed on the side of the pole body 21 facing the electrode component 3, and another portion of the first accommodating groove 201 is formed on the side of the adapter structure 22 facing the electrode component 3, and the first accommodating groove 201 is recessed relative to the mounting wall 111 in the direction away from the electrode component 3, so that 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 spatial first accommodating groove conductive part 33, so that it is not only convenient to accommodate the conductive part 33 to a greater extent, but also conducive to the design of a variety of forms of the conductive part 33.

[0351] In other embodiments of the present application, Fig.44 When the adapter structure 22 does not protrude in the direction away from the electrode component 3 (i.e., away from the active material coating portion 32) relative to the mounting wall 111, the first receiving groove 201 that is recessed in the direction away from the electrode component 3 relative to the mounting wall 111 can also be defined by the height difference between the adapter structure 22 and the pole body 21.

[0352] In some embodiments of this application, please refer to Figure 5 , the surface of one end of the pole body 21 facing the electrode component 3 is the inner end face 211 of the pole body 21, the inner end face 211 of the pole body 21 participates in forming the first receiving groove 201, and the conductive portion 33 is connected to the inner end face 211 of the pole body 21. That is, at least part of the inner end face 211 of the pole body 21 participates in defining the groove wall of the first receiving groove 201, and the conductive portion 33 is connected to the part of the inner end face 211 of the pole body 21 that serves as the groove wall of the first receiving groove 201. In the above technical solution, at least part of the first receiving groove 201 is surrounded by the surface of one side of the pole body 21 facing the electrode component 3, and the conductive portion 33 received in the first receiving groove 201 can be easily contacted and connected to the pole body 21, thereby improving the connection convenience and simplifying the structure.

[0353] Exemplarily, when at least part of the conductive portion 33 is accommodated in the first accommodation groove 201, the pole connecting portion (e.g., the folded portion 313 of the pole lug 335 described herein, or the second connecting segment 3363 or the first conductive segment 3365 of the conductive member 336) of the conductive portion 33 (e.g., the pole lug 335 or the conductive member 336) can be laid on the inner end surface 211 of the pole body 21 and connected to the inner end surface 211 of the pole body 21. During processing, the pole connecting portion of the conductive portion 33 can be first loaded into the first accommodation groove 201, and then the pole connecting portion can be laid on the inner end surface 211 of the pole body 21 and connected to the inner end surface 211 of the pole body 21.

[0354] Exemplarily, the conductive portion 33 may include a pole connecting portion, which may be in the shape of a relatively hard plate, such as one that will not bend downward under the action of gravity, such as the retracted portion 313 (such as an ultrasonic weld) of the pole ear 335 described herein, or the second connecting segment 3363 (such as a metal sheet) or the first conductive segment 3365 (such as a metal sheet) of the conductive member 336.

[0355] For example, refer to Figure 5 Regardless of whether the adapter structure 22 bulges relative to the mounting wall 111 in a direction away from the electrode component 3, the position of the inner end surface 220 of the adapter structure 22 adjacent to the pole body 21 is a surrounding area 2201 surrounding the pole body 21, and the surrounding area 2201 is flush with the inner end surface 211 of the pole body 21. The inner end surface 220 of the adapter structure 22 can be a planar structure or a non-planar structure, such as a bulge, and the circle of the inner end surface 220 of the adapter structure 22 that is most facing the pole body 21 is the surrounding area 2201.

[0356] Exemplarily, when the inner end surface 211 of the pole body 21 is set to be larger (for example, the adapter structure 22 is formed into a long strip extending along the length direction of the mounting wall 111, and the contour shape of the pole body 21 matches the contour shape of the adapter structure 22), and when the surrounding area 2201 is flush with the inner end surface 211 of the pole body 21, the pole connecting portion of the conductive portion 33 (for example, the retracted portion 313 of the pole ear 335 described in this article, or the second connecting section 3363 of the conductive member 336) can be completely laid flat on the inner end surface 211 of the pole body 21.

[0357] For example, in combination Fig.38 and Fig.42 When the inner end surface 211 of the pole body 21 is relatively small (for example, the adapter structure 22 is arranged as a long strip extending along the length direction of the mounting wall 111, and the pole body 21 is arranged 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 surface 211 of the pole body 21, a part of the pole connection part of the conductive part 33 (for example, the retracted part 313 of the pole ear 335 described in this article, or the second connection section 3363 of the conductive member 336) can be laid flat on the inner end surface 211 of the pole body 21, and the rest of the part can be laid flat on the surrounding area 2201, so that the pole connection part of the conductive part 33 (for example, the case where the pole connection part is also a long strip) can be supported as a whole, which is convenient for the pressing of the welding nozzle, so that the conductive part 33 can be reliably connected to the pole body 21.

[0358] Exemplarily, the conductive portion 33 may include a pole connecting portion, which may be in the shape of a relatively hard plate, such as one that will not bend downward under the action of gravity, such as the retracted portion 313 (such as an ultrasonic weld) of the pole ear 335 described herein, or the second connecting segment 3363 (such as a metal sheet) or the first conductive segment 3365 (such as a metal sheet) of the conductive member 336.

[0359] For example, refer to Fig.43 Regardless of whether the adapter structure 22 bulges relative to the mounting wall 111 in a direction away from the electrode component 3, the position of the inner end surface 220 of the adapter structure 22 adjacent to the pole body 21 is the surrounding area 2201 surrounding the pole body 21, and the inner end surface 211 of the pole body 21 protrudes from the surrounding area 2201 in the direction toward the electrode component 3. The inner end surface 220 of the adapter structure 22 can be a planar structure or a non-planar structure, such as a bulging shape, and the circle of the inner end surface 220 of the adapter structure 22 that is most facing the pole body 21 is the surrounding area 2201.

[0360] Thus, by setting the inner end surface 211 of the pole body 21 to protrude from the surrounding area 2201 toward the direction of the electrode component 3, when the height of the pole body 21 is constant, the pole body 21 can be retracted in the direction of the accommodating cavity 13, so as to reduce the space occupied by the pole component 2 outside the shell component 1, and reduce the battery cell 102 in the direction of setting the pole component 2 (for example Figure 3 The dimension in the first direction F1) shown in FIG.

[0361] Exemplarily, when the inner end face 211 of the pole body 21 is set to be larger (for example, the transition structure 22 is formed into a long strip extending along the length direction of the mounting wall 111, and the contour shape of the pole body 21 matches the contour shape of the transition structure 22), and when the inner end face 211 of the pole body 21 protrudes out of the surrounding area 2201 in the direction of the electrode component 3, the pole connecting portion of the conductive portion 33 (for example, the retracted portion 313 of the pole ear 335 described in this article, or the second connecting section 3363 of the conductive member 336) can be completely laid flat on the inner end face 211 of the pole body 21.

[0362] For example, in combination Fig.43When the inner end surface 211 of the pole body 21 is relatively small (for example, the adapter structure 22 is configured as a long strip extending along the length direction of the mounting wall 111, and the pole body 21 is disposed in the center of the adapter structure 22 and has a circular outline), and when the inner end surface 211 of the pole body 21 protrudes from the surrounding area 2201 toward the direction of the electrode component 3, the conductive portion 33 can be configured to include a pole ear 335 and a conductive member 336 connected to the pole ear 335, the conductive member 336 including a first conductive segment 3365 laid on the inner end surface 211 of the pole body 21, and a second conductive segment 3366 staggered from the inner end surface 211 of the pole body 21, the second conductive segment 3366 protrudes relative to the first conductive segment 3365 toward a direction away from the electrode component 3 (i.e., toward the outside, or toward a direction away from the active material coating portion 32), and the pole ear 335 is connected to the second conductive segment 3366. Thus, the height difference between the inner end surface 211 of the pole body 21 and the surrounding area 2201 can be used to accommodate the second conductive segment 3366 and the pole ear 335 of the conductive member 336, so that the space can be fully utilized, the space occupation of the conductive part 33 in the accommodating cavity 13 can be reduced, and the energy density of the battery cell 102 can be improved. For example, if the portion where the pole ear 335 connects with the second conductive segment 3366 (such as the retracted portion 313 described herein) is in the shape of a long strip, the second conductive segment 3366 can also be set to a long strip, and the first conductive segment 3365 can be set to a circular shape that matches the shape of the pole body 21, which can meet the connection requirements. In addition, when the conductive member 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, the conductive member 336 can be processed with a material having a certain hardness and thickness, for example, the conductive member 336 can be a metal sheet.

[0363] For example, refer to Fig.44 Regardless of whether the adapter structure 22 bulges relative to the mounting wall 111 in a direction away from the electrode component 3, the position of the inner end surface 220 of the adapter structure 22 adjacent to the pole body 21 is a surrounding area 2201 surrounding the pole body 21, and the surrounding area 2201 protrudes from the inner end surface 211 of the pole body 21 in a direction toward the electrode component 3. The inner end surface 220 of the adapter structure 22 can be a planar structure or a non-planar structure, such as a bulging shape, and the circle of the inner end surface 220 of the adapter structure 22 that is most facing the pole body 21 is the surrounding area 2201.

[0364] For example, refer to Fig.46When the inner end face 211 of the pole body 21 is set to be larger (for example, the adapter structure 22 is formed into a long strip extending along the length direction of the mounting wall 111, and the contour shape of the pole body 21 matches the contour shape of the adapter structure 22), and when the surrounding area 2201 protrudes from the inner end face 211 of the pole body 21 in the direction of the electrode component 3, the pole connecting portion of the conductive portion 33 (for example, the retracted portion 313 of the pole ear 335 described in this article, or the second connecting section 3363 of the conductive member 336) can be completely laid flat on the inner end face 211 of the pole body 21.

[0365] For example, in combination Fig.44 When the inner end surface 211 of the pole body 21 is relatively small (for example, the adapter structure 22 is configured as a long strip extending along the length direction of the mounting wall 111, and the pole body 21 is disposed at the center of the adapter structure 22 and has a circular outline), and when the surrounding area 2201 protrudes from the inner end surface 211 of the pole body 21 in the direction toward the electrode component 3, the conductive member 336 can be configured to include a first conductive segment 3365 laid on the inner end surface 211 of the pole body 21, and a third conductive segment 3367 staggered from the inner end surface 211 of the pole 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 pole tab 335 is connected to the third conductive segment 3367. Thus, the conductive member 336 can meet the connection requirements with the inner end surface 211 of the pole body 21 and can easily meet the connection requirements with the pole tab 335. In addition, when the conductive member 336 includes the first conductive segment 3365 and the third conductive segment 3367, in order to ensure that the third conductive segment 3367 protrudes relative to the first conductive segment 3365 toward the direction of the electrode component 3, the conductive member 336 can be processed with a material having a certain hardness and thickness, for example, the conductive member 336 can be a metal sheet. Exemplarily, if the portion where the tab 335 connects with the third conductive segment 3367 (such as the gathered portion 313 described herein) is in the shape of a strip, the third conductive segment 3367 can also be set to a strip shape, and the first conductive segment 3365 can be set to a shape that matches the matching area 211a (such as a circle), which can meet the connection requirements.

[0366] See also Figure 53-Figure 56 , Fig.53 The structure cross-sectional view of the battery cell 102 of some other embodiments of the present application; Fig.54 for Fig.53 A partial enlarged view of the battery cell 102 shown in FIG. Fig.55 The structure cross-sectional view of the battery cell 102 of some other embodiments of the present application; Fig.56 for Fig.55The housing component 1 includes a housing body 11 having an opening 113 and a housing cover 12, wherein the housing cover 12 covers the opening 113, and the mounting wall 111 includes a wall body of the housing body 11 disposed opposite to the opening 113. That is, the pole component 2 is mounted on the wall body of the housing body 11 opposite to the opening 113.

[0367] In this embodiment, the pole component 2 and the mounting wall 111 are located on the same side of the electrode component 3, that is, the pole component 2 is arranged on the side where the mounting wall 111 is located, so that the pole component 2 can be installed at the mounting hole 112 of the mounting wall 111. For example, when the mounting wall 111 is located above the electrode component 3, the pole component 2 is also located above the electrode component 3; when the mounting wall 111 is located below the electrode component 3, the pole component 2 is also located below the electrode component 3; when the mounting wall 111 is located on the side of the electrode component 3, the pole component 2 is also located on the same side of the electrode component 3.

[0368] Exemplarily, the housing component 1 may be surrounded by a plurality of walls facing in different directions, one of which is the mounting wall 111, and a plane perpendicular to the penetration direction of the mounting hole 112 is taken as a projection plane, and the orthographic projection of the mounting hole 112 on the projection plane completely falls within the range of the orthographic projection of the mounting wall 111 on the 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 may be provided on the mounting wall 111 to meet the installation requirements of one or more pole components 2.

[0369] See also Figure 57-Figure 60 , Fig.57 Schematic diagram of the structure of the battery cell 102 of some other embodiments of the present application; Fig.58 for Fig.57 An exploded view of the structure of the battery cell 102 shown in FIG. Fig.59 for Fig.57 A structural cross-sectional view of a battery cell 102 shown in FIG. Fig.60 for Fig.59 The housing component 1 includes a housing body 11 having an opening 113 and a housing cover 12, the housing cover 12 covers the opening 113, and the mounting wall 111 includes the housing cover 12. That is, the pole component 2 is mounted on the housing cover 12.

[0370] A support plate 15 is further provided in the shell body 11 . The support plate 15 is located between the wall of the shell body 11 and the shell cover 12 opposite to the electrode component 3 , so as to support and protect the electrode component 3 .

[0371] In the above technical solution, the pole component 2 can be arranged on the wall of the shell body 11 opposite to the opening 113, or the pole component 2 can be arranged on the shell cover 12, so that the pole component 2 can be flexibly arranged.

[0372] See also Fig.61 , Fig.61 The present application also provides a method for assembling a battery cell, the battery cell being the battery cell described in the above embodiment, and the assembly method comprising:

[0373] S20: Connecting the electrode component to the pole component;

[0374] Exemplarily, the electrode component 3 includes a pole ear portion 33, and the pole component 2 includes a pole body 21, and "step S20, connecting the electrode component 3 with the pole component 2" can be specifically: "directly or indirectly connecting the pole ear portion 33 with the pole body 21" to achieve electrical conduction between the electrode component 3 and the pole component 2.

[0375] S30: Mounting the pole component connected to the electrode component to the mounting wall of the housing component.

[0376] The pole component 2 can be in various forms. It can be an integral and inseparable form of the incoming material, or it can be a form in which the incoming material is in multiple parts and then assembled. Therefore, "step S30, installing the pole component 2 connected to the electrode component 3 to the installation wall 111" should be understood in a broad sense, that is, the part connecting the pole component 2 and the electrode component 3 can be assembled to the installation wall 111.

[0377] In the above technical solution, since the connection between the electrode component 3 and the pole component 2 is completed first, and then the pole component 2 and the shell component 1 are assembled and connected, rather than pre-installing the pole component and the shell component first and then connecting the electrode component and the pole component, this is conducive to shortening the length of the conductive part 33 connecting the pole component 2 and the electrode component 3, reducing the redundancy of the conductive part 33 in the shell component 1, and reducing the space occupied by the conductive part 33 in the shell component 1, which is conducive to improving the energy density of the battery cell 102, and is conducive to reducing the risk of the conductive part 33 being inserted into the active material coating part 32 of the electrode component 3 and causing a short circuit, thereby improving the reliability of the battery cell 102. In addition, this assembly method can realize the assembly of the battery cell 102 regardless of whether the pole component 2 is set on the shell body 11 or the pole component 2 is set on the shell cover 12, so the installation position of the pole component 2 on the shell component 1 can be flexibly selected. When the pole component 2 is disposed on the shell body 11 , it is beneficial to reduce the cracking problem at the connection between the shell body 11 and the shell cover 12 , and improve the reliability of the battery cell 102 .

[0378] Some specific embodiments according to the present application are described below.

[0379] Embodiment 1

[0380] Combination Fig.62The shell component 1 has a receiving cavity 13, and includes a shell body 11 that participates in forming 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, and the mounting wall 111 has a mounting hole 112; the pole component 2 is mounted on the mounting wall 111, and the mounting hole 112 is covered. The electrode component 3 includes a plurality of stacked electrode assemblies 31, so as to have an active material coating portion 32 accommodated in the receiving cavity 13, and a pole ear 335 connected to the active material coating portion 32, and the pole ear 335 is connected to the pole component 2. The pole component 2 includes a pole body 21, a transition structure 22, and an insulating structure 23, the transition structure 22 surrounds the pole body 21, the insulating structure 23 is insulated and matched between the pole body 21 and the transition structure 22, the transition structure 22 is connected to the mounting wall 111, and the pole body 21 is connected to the pole ear 335.

[0381] Combination Fig.62 When assembling the battery cell 102, a plurality of electrode assemblies 31 are stacked along the thickness direction of the electrode assembly 31 (for example, the fourth direction F4 shown in the figure), and the multi-layered pole ear sheets 311 of the same polarity of the plurality of electrode assemblies 31 are stacked and connected to form a gathering portion 313, and then the gathering portion 313 is connected to the pole body 21, and the electrode component 3 is installed into the shell body 11 according to the direction of the pole ear 335 relative to the active material coating portion 32 toward the mounting hole 112. As the electrode component 3 moves into the shell body 11, the gathering portion 313 passes through to the outside of the mounting hole 112, and the gathering portion 313 is connected to the pole component 2 disposed on the outside of the mounting wall 111 on the outside of the mounting wall 111, and then the pole component 2 connected with the gathering portion 313 is covered with the mounting hole 112 from the outside of the mounting wall 111, and then the adapter structure 22 is welded and fixed to the mounting wall 111.

[0382] The welding position between the pole component 2 and the retracted portion 313 is located outside the shell body 11 , which can improve the problem of conductive chips generated during welding entering the shell body 11 and causing damage to the electrode component 3 .

[0383] Embodiment 2

[0384] Combination Fig.63The shell component 1 has a receiving cavity 13, and includes a shell body 11 that participates in forming 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, and the mounting wall 111 has a mounting hole 112; the pole component 2 is mounted on the mounting wall 111, and the mounting hole 112 is covered. The electrode component 3 includes a plurality of stacked electrode assemblies 31, so as to have an active material coating portion 32 accommodated in the receiving cavity 13, and a pole ear 335 connected to the active material coating portion 32, and the pole ear 335 is connected to the pole component 2. The pole component 2 includes a pole body 21, a transition structure 22, and an insulating structure 23, the transition structure 22 surrounds the pole body 21, the insulating structure 23 is insulated and matched between the pole body 21 and the transition structure 22, the transition structure 22 is connected to the mounting wall 111, and the pole body 21 is connected to the pole ear 335.

[0385] Combination Fig.63 When assembling the battery cell 102, a plurality of electrode assemblies 31 are stacked along the thickness direction of the electrode assembly 31 (for example, the fourth direction F4 shown in the figure), and the multi-layered pole tabs 311 of the plurality of electrode assemblies 31 with the same polarity are stacked and connected to form a gathering portion 313, and then the gathering portion 313 is connected to the pole body 21, and the electrode component 3 and the pole component 2 connected to the gathering portion 313 are installed into the shell body 11 according to the direction of the pole component 2 relative to the active material coating portion 32 toward the mounting hole 112. As the electrode component 3 moves into the shell body 11, the pole component 2 passes through the mounting hole 112 to the outside of the mounting wall 111, and then the pole component 2 connected with the gathering portion 313 is covered with the mounting hole 112 from the outside of the mounting wall 111, and then the adapter structure 22 is welded and fixed to the mounting wall 111.

[0386] The pole component 2 and the retracted portion 313 are not yet installed in the shell body 11 during welding, which can improve the problem of conductive chips formed during welding entering the shell body 11 and causing damage to the electrode component 3.

[0387] Embodiment 3

[0388] Combination Fig.64The shell component 1 has a receiving cavity 13, and includes a shell body 11 that participates in forming 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, and the mounting wall 111 has a mounting hole 112; the pole component 2 is mounted on the mounting wall 111, and the mounting hole 112 is covered. The electrode component 3 includes a plurality of stacked electrode assemblies 31, so as to have an active material coating portion 32 accommodated in the receiving cavity 13, and a pole ear 335 connected to the active material coating portion 32, and the pole ear 335 is connected to the pole component 2. The pole component 2 includes a pole body 21, a transition structure 22, and an insulating structure 23, the transition structure 22 surrounds the pole body 21, the insulating structure 23 is insulated and matched between the pole body 21 and the transition structure 22, the transition structure 22 is connected to the mounting wall 111, and the pole body 21 is connected to the pole ear 335.

[0389] Combination Fig.64 When assembling the battery cell 102, a plurality of electrode assemblies 31 are stacked along the thickness direction of the electrode assembly 31 (for example, the fourth direction F4 shown in the figure), and the multi-layered pole tabs 311 of the plurality of electrode assemblies 31 with the same polarity are stacked and connected to form a gathering portion 313, and then the gathering portion 313 is connected to the pole body 21, and the electrode component 3 and the pole component 2 connected to the gathering portion 313 are installed into the shell body 11 according to the direction of the pole component 2 relative to the active material coating portion 32 toward the mounting hole 112, and then the pole component 2 is covered with the mounting hole 112 from the inner side of the mounting wall 111, and then the adapter structure 22 is welded and fixed to the mounting wall 111.

[0390] The pole component 2 and the retracted portion 313 are not yet installed in the shell body 11 during welding, which can improve the problem of conductive chips formed during welding entering the shell body 11 and causing damage to the electrode component 3.

[0391] Embodiment 4

[0392] Combination Fig.65The shell component 1 has a receiving cavity 13, and includes a shell body 11 that participates in forming 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, and the mounting wall 111 has a mounting hole 112; the pole component 2 is mounted on the mounting wall 111 and blocked at the mounting hole 112. The electrode component 3 includes a plurality of stacked electrode assemblies 31, so as to have an active material coating portion 32 accommodated in the receiving cavity 13, and a pole ear 335 connected to the active material coating portion 32, and the pole ear 335 is connected to the pole component 2. The pole component 2 includes a pole body 21 and an insulating sealing component 24. The pole body 21 includes a first pole component 21a and a second pole component 21b. The second pole component 21b defines a matching hole 21b1. The first pole component 21a is arranged on the side of the second pole component 21b away from the electrode component 3 and covers the matching hole 21b1. The second pole component 21b is connected to the installation wall 111, and the first pole component 21a is connected to the pole ear 335.

[0393] Combination Fig.65 When assembling the battery cell 102, a plurality of electrode assemblies 31 are stacked along the thickness direction of the electrode assembly 31 (e.g., the fourth direction F4 shown in the figure), and the multi-layered pole tabs 311 of the plurality of electrode assemblies 31 with the same polarity are stacked and connected to form a gathered portion 313. Then, on one hand, the gathered portion 313 is connected to the first pole piece 21a, and on the other hand, the second pole piece 21b is assembled to the mounting wall 111 by riveting, and the insulating sealing component 24 is clamped between the second pole piece 21b and the mounting wall 111. Thereafter, the electrode component 3 and the first pole component 21a connected to the gathering portion 313 can be installed into the shell body 11 according to the direction of the first pole component 21a relative to the active material coating portion 32 toward the mounting hole 112. As the electrode component 3 moves into the shell body 11, the first pole component 21a passes through the matching hole 21b1 to the outside of the mounting wall 111. Then, the first pole component 21a connected to the gathering portion 313 is covered with the matching hole 21b1 from the outside of the mounting wall 111, and then the first pole component 21a and the second pole component 21b are welded and fixed.

[0394] The retracted portion 313 is not yet installed in the shell body 11 when being welded to the first pole piece 21 a , which can improve the problem of conductive scraps formed during welding entering the shell body 11 and damaging the electrode component 3 .

[0395] Embodiment 5

[0396] Combination Fig.66 The difference between the fifth embodiment and the fourth embodiment is that the gathered portion 313 is first passed through the matching hole 21b1, and then the gathered portion 313 and the first pole piece 21a are welded, which will not be described here.

[0397] It is worth noting that the above-mentioned embodiments 1 to 5 are intended to illustrate the processing sequence of the battery cell 102, but the specific structure of the electrode cell 102 is not limited. For example, the pole ear 335 and the pole component 2 in the above-mentioned embodiments 1 to 5 can be directly connected, or can be connected through the conductive member 336 of the embodiment of the present application. For another example, the form of the transition structure 22 of the pole component 2 in the above-mentioned embodiments 1 to 3 is not limited, the form of the insulating structure 23 is not limited, and the form of the pole body 21 is not limited. All of them can refer to any of the above-mentioned embodiments of the present application and will not be repeated here.

[0398] According to some embodiments of the present application, the present application further provides a battery 100, comprising the battery cell 102 described in any of the above schemes.

[0399] In the technical solution of the embodiment of the present application, by adopting the above-mentioned battery cell 102, when the battery 100 is used in a vibration environment, the impact of the active material coating portion 32 toward the mounting wall 111 can be reduced, thereby protecting the electrode component 2 and reducing the risk of short circuit of the battery cell 102, thereby improving the reliability of the battery 100.

[0400] Exemplarily, the battery 100 may further include a busbar component, and the battery cells 102 are multiple and at least two are electrically connected through the busbar component. Thus, the series connection and / or parallel connection of multiple battery cells 102 can be achieved. For example, when multiple battery cells 102 are connected in series, the pole component 2 of the anode of one battery cell 102 is connected to the pole component 2 of the cathode of the next battery cell 102 through a busbar component, and the pole component 2 of the cathode of the battery cell 102 is connected to the pole component 2 of the anode of the previous battery cell 102 through another busbar component.

[0401] For example, in combination Figure 2 The battery 100 includes a box body 101, a plurality of battery cells 102 are contained in the box body 101, and the bottom of the box body 101 is a box body bottom plate 1013. The pole component 2 is arranged on the side of the shell component 1 facing the box body bottom plate 1013, or on the side of the shell component 1 away from the box body bottom plate 1013.

[0402] During the use of the battery 100, for example, when it is used in a vehicle, the box bottom plate 1013 is located at the bottom of the box 101 in the direction of gravity. In this way, when the pole component 2 is arranged on the side of the shell component 1 facing the box bottom plate 1013, it means that the pole component 2 is located at the bottom of the shell component 1 in the direction of gravity. At this time, the battery cell 102 is in an inverted state, and the decompression product is sprayed in the direction away from the passenger compartment, which is safer; and when the pole component 2 is arranged on the side of the shell component 1 away from the box bottom plate 1013, it means that the pole component 2 is located at the top of the shell 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 box 101 can be flexibly set.

[0403] According to some embodiments of the present application, the present application further 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.

[0404] The power-consuming device may be any of the aforementioned devices or systems using the battery 100 .

[0405] In the technical solution of the embodiment of the present application, by adopting the above-mentioned battery cell 102 or battery 100, the electrical device can be used in a vibration environment, thereby improving the reliability of the electrical device.

[0406] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: A housing component defines a receiving cavity and includes a mounting wall; A pole component, mounted on the mounting wall, and comprising a pole body; An electrode component is accommodated in the accommodation cavity and includes an active material coating portion and a conductive portion, wherein the conductive portion is connected between the active material coating portion and the pole body; The conductive portion is bent to form at least two opening slots, the openings of the two opening slots face different directions, and are spaced apart in the thickness direction of the mounting wall.

2. The battery cell according to claim 1, characterized in that: One end of the conductive part is directly connected to the active material coating part, and the other end is directly connected to the pole body.

3. The battery cell according to claim 1, characterized in that: The conductive portion includes a closing segment, a first extension segment and a second extension segment arranged in its extension direction, the closing segment is connected to the active material coating portion, the second extension segment is connected to the pole body, the first end of the first extension segment is connected to the closing segment through a first bending portion, and the first side of the first extension segment forms an open groove with the first bending portion and the closing segment, the other end of the first extension segment is connected to the second extension segment through a second bending portion, and the second side of the first extension segment opposite to the first side forms another open groove with the second bending portion and the second extension segment.

4. The battery cell according to claim 3, characterized in that: The first bending portion is arranged in the center of the width direction of the pole body; Alternatively, the first bent portion is located on one side of the center position in the width direction of the pole body, and the second bent portion is located on the other side of the center position in the width direction of the pole body.

5. The battery cell according to claim 3, characterized in that: The conductive portion includes a plurality of stacked pole tabs, and the plurality of pole tabs are close to each other near the root of the active material coating portion to form a triangular close segment.

6. The battery cell according to claim 3, characterized in that: The conductive portion includes a plurality of stacked pole tabs, and the plurality of pole tabs are connected at one end of the first bending portion away from the approaching section to form a first connecting portion.

7. The battery cell according to claim 6, characterized in that: When the conductive portion is in a straightened state, a distance between the first connecting portion and an end of the active material coating portion close to the mounting wall is less than or equal to 2.5 mm.

8. The battery cell according to claim 6, characterized in that: An insulating bracket is provided between the end portion of the active material coating portion connected to the conductive portion and the mounting wall, the insulating bracket having a through hole, the conductive portion being passed through the through hole and connected to the pole body; The through hole has a first hole edge at one end close to the active material coating portion and a second hole edge at one end close to the pole body, and the distance between the first connecting portion and the active material coating portion is greater than the distance between the first hole edge and the active material coating portion.

9. The battery cell according to claim 6, characterized in that: The plurality of pole tabs are connected at one end of the second bending portion close to the second extending section to form a second connecting portion.

10. The battery cell according to claim 9, characterized in that: When the conductive portion is in a straightened state, the distance between the first connecting portion and the second connecting portion is less than or equal to 16 mm, and the distance between the second connecting portion and one end of the second extending section away from the active material coating portion is greater than or equal to 8 mm.

11. The battery cell according to claim 3, characterized in that: The conductive portion includes a pole lug, and the pole lug includes a plurality of pole lug sheets stacked in layers. The close segment, the first extension segment, and the second extension segment are formed by different parts of the pole lug.

12. The battery cell according to claim 11, characterized in that: The plurality of electrode tabs are brought together and connected at a position of the close section away from the active material coating portion to form the first extension section and the second extension section; The plurality of pole tabs are connected at the second extension section to form a third connection portion, the third connection portion is in the shape of a long strip extending along the length direction of the pole body, and the third connection portion is centrally arranged in the width direction of the pole body.

13. The battery cell according to claim 3, characterized in that: The conductive part comprises: A tab connected to one end of the active material coating portion close to the mounting wall, and the tab includes a plurality of tab sheets stacked; A conductive member is connected between the pole lug and the pole body, a portion of the conductive member forms the second extension segment and another portion forms at least a portion of the first extension segment, and at least a portion of the pole lug forms the approaching segment.

14. The battery cell according to claim 13, characterized in that: The conductive member has a slot, and the tab is at least partially inserted into the slot.

15. The battery cell according to claim 13, characterized in that: The conductive member comprises a transfer sheet, and the transfer sheet comprises a plurality of transfer foils which are stacked and connected so that the transfer sheet can be deformed.

16. The battery cell according to claim 3, characterized in that: The electrode component also includes: An insulating member, wherein the insulating member is at least partially arranged between the end portion where the active material coating portion is connected to the conductive portion and the pole body, the insulating member is provided with an escape hole for the conductive portion to pass through, and the insulating member blocks the portion where the conductive portion passes through the insulating member and is connected to the pole body, and the active material coating portion.

17. The battery cell according to claim 16, characterized in that: The avoidance hole comprises a first avoidance hole, and the insulating member comprises: An insulating film, wherein the insulating film completely covers the active material coating portion, the first avoidance hole is opened at a position where the insulating film is opposite to the mounting wall and is adapted to the thickness of the conductive portion, and the insulating film forms a peripheral wall of the first avoidance hole that blocks between the first extension section and the active material coating portion, and between the second extension section and the active material coating portion.

18. The battery cell according to claim 17, characterized in that: The first avoidance hole itself is a normally open hole adapted to the thickness of the conductive part.

19. The battery cell according to claim 17, characterized in that: A tearing structure is provided at a position of the insulating film opposite to the mounting wall, and the tearing structure is suitable for being torn under the action of the conductive part to form the first avoidance hole adapted to the thickness of the conductive part.

20. The battery cell according to claim 17, characterized in that: A retaining sheet is connected to at least a partial area of ​​the insulating film around the circumference of the first avoidance hole, and the hardness of the retaining sheet is greater than the hardness of the insulating film.

21. The battery cell according to claim 17, characterized in that: The avoidance hole includes a second avoidance hole arranged opposite to the first avoidance hole, and the insulating member further includes: An insulating bracket includes a bracket body, which is arranged at one end of the active material coating portion close to 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 second avoidance hole is opened in the bracket body, and the conductive portion passes through the first avoidance hole and is connected to the pole body in or from the second avoidance hole.

22. The battery cell according to claim 21, characterized in that: The second avoidance hole has a first hole wall and a second hole wall which are arranged opposite to each other in the width direction of the pole body, and the insulating support further comprises: The first separator is arranged at the first hole wall and connected to the bracket body. The first separator extends toward the center of the second avoidance hole. The first separator is blocked between the first extension section and the approach section and abuts against the first extension section and / or the approach section.

23. The battery cell according to claim 22, characterized in that: The thickness of the first separator is smaller than that of the bracket body, and the first separator is separated from the hole wall of the second avoidance hole on both sides of the length direction of the pole body, so that the first separator can be deformed under the pressure of the conductive part.

24. The battery cell according to claim 22, characterized in that: The insulating support further comprises: The second separator is arranged at the second hole wall and connected to the bracket body. The second separator extends toward the center of the second avoidance hole and is spaced apart from the first separator. A through hole connected to the second avoidance hole is formed therebetween. The conductive portion is passed through the through hole. The second separator is blocked between the second extension section and the first extension section or the approach section, and abuts against the first extension section and / or the approach section.

25. The battery cell according to claim 24, characterized in that: The dimension of the through hole in the width direction of the pole body is greater than or equal to the thickness of the conductive portion.

26. The battery cell according to any one of claims 1 to 25, characterized in that: The pole component further includes a transition structure and an insulating structure. The transition structure surrounds the pole body and is connected to the mounting wall. The insulating structure is insulated and sealed between the transition structure and the pole body.

27. The battery cell according to claim 26, characterized in that: The adapter structure is formed into a long strip extending along the length direction of the mounting wall, and the contour shape of the pole body matches the contour shape of the adapter structure; Alternatively, the transition structure is formed into a long strip extending along the length direction of the installation wall, and the pole body is arranged at the length center position of the transition structure and is circular.

28. The battery cell according to claim 26, characterized in that: The insulating structure comprises a sealing structure, which is arranged around the peripheral side of the transition structure facing the pole body and is at least partially clamped between the transition structure and the pole body in the inner and outer directions of the mounting wall.

29. The battery cell according to claim 26, characterized in that: The mounting wall is provided with a mounting hole, the pole component is covered in the mounting hole, and the edge of the transition structure is overlapped on one side of the mounting wall in the wall thickness direction.

30. The battery cell according to claim 29, characterized in that The edge of the transition structure overlaps the side of the mounting wall away from the electrode component, the mounting wall has a first recessed groove arranged around the mounting hole, the first recessed groove is open in the direction away from the electrode component, and the edge of the transition structure has a flange portion embedded in the first recessed groove.

31. The battery cell according to claim 29, characterized in that: The edge of the transition structure overlaps the side of the mounting wall away from the electrode component, the mounting hole is a long strip hole, and the pole component is formed into a long strip structure matching the shape of the mounting hole.

32. The battery cell according to claim 29, characterized in that: The edge of the transition structure overlaps the side of the mounting wall facing the electrode component, and the edge of the transition structure has a second recessed groove open 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.

33. The battery cell according to claim 26, characterized in that: The pole component is surrounded by a first receiving groove which is recessed relative to the mounting wall in a direction away from the electrode component and is open in a direction toward the electrode component. The electrode component is connected to the pole 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 pole body.

34. The battery cell according to any one of claims 1 to 25, characterized in that: The shell component includes a shell body with an opening and a shell cover, and the shell cover covers the opening; the installation wall includes a wall body arranged opposite to the shell body and the opening, and / or the installation wall includes the shell cover.

35. A battery, characterized in that: Comprising a battery cell according to any one of claims 1-34.

36. The battery according to claim 35, characterized in that The battery comprises a box body, the battery cells are multiple and are accommodated in the box body, the bottom of the box body is the box body bottom plate, and the pole component is arranged on the side of the shell component facing the box body bottom plate, or on the side of the shell component away from the box body bottom plate.

37. An electrical device, characterized in that: Comprising a battery cell according to any one of claims 1-34; or comprising a battery according to claim 35 or 36.

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