Battery cell, battery device, and electric device

Abstract

The application provides a battery monomer, a battery device and a power utilization device, and belongs to the technical field of batteries. The battery monomer comprises a shell, an electrolyte and an electrode assembly. The electrode assembly is arranged in the shell, a flat area of the electrode assembly comprises a plurality of pole piece segments and a plurality of isolation segments, the plurality of pole piece segments comprise first pole piece segments and second pole piece segments which are alternated and stacked along a first direction, and an isolation segment is arranged between each two adjacent pole piece segments. The isolation segment is bent to form a body part located between two adjacent second pole piece segments and a bent part located on one side of the second pole piece segment close to a wall part, the bent parts of two adjacent isolation segments are stacked, the plurality of isolation segments comprise first isolation segments and second isolation segments, in the first direction, the size of the bent part of the first isolation segment is greater than the size of the bent part of the second isolation segment, and a second isolation segment is arranged between two adjacent first isolation segments. The end of the flat area close to the wall part is an uneven structure, so that the wetting effect of the electrode assembly is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery cell, a battery device, and an electrical device. Background Technology

[0002] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, power batteries, as the power source, play an irreplaceable and crucial role. With the vigorous promotion of new energy vehicles, the demand for power battery products is also increasing day by day.

[0003] In battery technology, a battery cell in a battery device typically includes a casing and an electrode assembly housed within the casing, with the casing filled with an electrolyte. However, existing battery cells are prone to poor wetting of the electrode assembly by the electrolyte during use, resulting in poor performance of the battery cell and even a high risk of metal precipitation during use, which is detrimental to improving the reliability of the battery cell. Utility Model Content

[0004] This application provides a battery cell, a battery device, and an electrical device, which can effectively improve the performance and reliability of the battery cell.

[0005] In a first aspect, embodiments of this application provide a battery cell, including a casing, an electrolyte, and at least one electrode assembly; the casing has a wall portion; the electrolyte is contained within the casing; the electrode assembly is disposed within the casing, the electrode assembly has a flat region, the flat region including multiple electrode segments and multiple isolation segments, the multiple electrode segments are stacked along a first direction, and an isolation segment is disposed between each pair of adjacent electrode segments; the multiple electrode segments include first electrode segments and second electrode segments alternately arranged along the first direction, the first electrode segments and the second electrode segments have opposite polarities, and the end of the first electrode segment near the wall portion in the thickness direction does not extend beyond the second electrode segment, the isolation segment is bent to form an interconnected body portion and a bent portion, the body portion... Between two adjacent second pole segments, the bending portion is located on the side of the second pole segment closer to the wall portion, and the bending portions of two adjacent isolation segments are stacked. The plurality of isolation segments include a first isolation segment and a second isolation segment. The distance of the bending portion of the first isolation segment from one end connected to the body portion of the first isolation segment to one end away from the body portion of the first isolation segment in the first direction is greater than the distance of the bending portion of the second isolation segment from one end connected to the body portion of the second isolation segment to one end away from the body portion of the second isolation segment in the first direction. Along the first direction, at least one set of two adjacent first isolation segments are provided with a second isolation segment. The first direction is perpendicular to the thickness direction of the wall portion.

[0006] In the above technical solution, the flat region of the electrode assembly has multiple isolation segments arranged along a first direction. Each isolation segment is bent to form a body portion located between two adjacent second electrode segments and a bent portion connected to one end of the body portion. The bent portion is located on the side of the second electrode segment near the wall portion in the thickness direction of the wall portion. Furthermore, the bent portions of adjacent isolation segments are stacked, allowing the multiple bent portions to also separate the wall portion and the electrode segment. This structure of the isolation segment improves the effect of separating adjacent electrode segments, reducing the risk of overlap between adjacent electrode segments near the wall portion. Specifically, by configuring the multiple isolation segments as first and second isolation segments including bent portions with different dimensions in the first direction, and by providing a bent portion with a shorter dimension in the first direction between at least one set of two adjacent first isolation segments in the first direction, the solution is further enhanced. The second isolation section is designed so that the multiple bends on the side of the multiple electrode segments near the wall have different dimensions in the first direction. This allows the flat area of ​​the electrode assembly to have an uneven structure near the wall, creating channels with different gap sizes between the flat area of ​​the electrode assembly and the wall in the thickness direction of the wall. This facilitates the entry of electrolyte into the electrode assembly and wetting of the multiple electrode segments, reducing the resistance encountered by the electrolyte when flowing between the electrode assembly and the wall. As a result, the battery cell with this structure can improve the wetting effect of the electrolyte entering the electrode assembly, alleviating the phenomenon of poor electrolyte wetting effect during the cycle of use, and reducing the risk of metal precipitation during the use of the battery cell. This is beneficial to improving the performance and reliability of the battery cell.

[0007] In some embodiments, along the first direction, at least one second isolation segment is provided between every two adjacent first isolation segments.

[0008] In the above technical solution, by setting a second isolation section between each pair of adjacent first isolation sections, the unevenness of the flat area near the wall of the electrode assembly can be improved, and the number of channels with different gap sizes between the flat area and the wall of the electrode assembly can be increased. This helps to reduce the difficulty of electrolyte entering the electrode assembly from the flat area near the wall, and further improves the effect of electrolyte entering the electrode assembly and wetting multiple electrode segments.

[0009] In some embodiments, along the first direction, a second isolation segment is provided between every two adjacent first isolation segments.

[0010] In the above technical solution, by setting a second isolation section between each pair of adjacent first isolation sections, the first isolation sections and the second isolation sections are arranged alternately in the first direction. This can further improve the unevenness of the flat area near the wall of the electrode assembly and further increase the number of channels with different gap sizes between the flat area and the wall of the electrode assembly. This further reduces the difficulty for the electrolyte to enter the electrode assembly from the flat area near the wall, thereby further improving the effect of the electrolyte entering the electrode assembly and wetting multiple electrode segments.

[0011] In some embodiments, the electrode assembly is a wound structure, the central axis of the winding of the electrode assembly extends along the thickness direction of the wall portion, and the electrode assembly includes a positive electrode plate, a negative electrode plate, and two separators. The separators are disposed between the positive electrode plate and the negative electrode plate. The positive electrode plate includes a first electrode segment located in the flat region, and the negative electrode plate includes a second electrode segment located in the flat region. The two separators include a first separator and a second separator, and the negative electrode plate is located between the first separator and the second separator. The portion of the first separator located in the flat region forms a plurality of first separator segments, and the portion of the second separator located in the flat region forms a plurality of second separator segments.

[0012] In the above technical solution, the electrode assembly has a wound structure, and the positive and negative electrode sheets of the electrode assembly are stacked and wound with two insulating members to form multiple electrode segments and multiple insulating segments stacked along the first direction in the flat area of ​​the electrode assembly. The portions of the two insulating members in the flat area are arranged alternately along the first direction. By setting the portion of the first insulating member in the flat area to form multiple first insulating segments and the portion of the second insulating member in the flat area to form multiple second insulating segments, all the multiple first insulating segments are formed by first insulating members and all the multiple second insulating segments are formed by second insulating members, so as to facilitate the formation of the first and second insulating segments arranged alternately along the first direction. This reduces the difficulty of forming the first and second insulating segments in the flat area, thereby reducing the manufacturing difficulty of the electrode assembly.

[0013] In some embodiments, the electrode assembly is a stacked structure, comprising a plurality of positive electrode plates, a plurality of negative electrode plates, and a plurality of separators. The positive electrode plates and the negative electrode plates are stacked and alternately arranged along the first direction. A separator is disposed between each adjacent positive electrode plate and negative electrode plate. The positive electrode plate is a first electrode segment, and the negative electrode plate is a second electrode segment. The plurality of separators include a first separator and a second separator, which are alternately arranged along the first direction. The first separator is a first isolation segment, and the second separator is a second isolation segment.

[0014] In the above technical solution, the electrode assembly is a stacked structure, and an isolation member is provided between each adjacent positive electrode and negative electrode, so that the multiple isolation members of the electrode assembly are arranged at intervals along the first direction. By setting the multiple isolation members of the electrode assembly to include a first isolation member and a second isolation member arranged alternately along the first direction, and the first isolation member is a first isolation segment and the second isolation member is a second isolation segment, it is easier to form the first isolation segment and the second isolation segment arranged alternately along the first direction, thereby reducing the difficulty of forming the first isolation segment and the second isolation segment in the flat area, so as to reduce the manufacturing difficulty of the electrode assembly.

[0015] In some embodiments, the difference between the distance in the first direction of the bent portion of the first isolation segment from one end connected to the body portion of the first isolation segment to one end away from the body portion of the first isolation segment and the distance in the first direction of the bent portion of the second isolation segment from one end connected to the body portion of the second isolation segment to one end away from the body portion of the second isolation segment is 1mm-3mm.

[0016] In the above technical solution, on the one hand, the difference between the size of the bent portion of the first isolation section in the first direction and the size of the bent portion of the second isolation section in the first direction is set to be greater than or equal to 1 mm, so as to increase the size of the gap formed after the bent portions of the first isolation section and the bent portions of the second isolation section are stacked together, thereby further reducing the difficulty of the electrolyte entering the electrode assembly from the end near the wall of the flat area, and further improving the effect of the electrolyte entering the electrode assembly and wetting multiple electrode segments. On the other hand, the difference between the size of the bent portion of the first isolation section in the first direction and the size of the bent portion of the second isolation section in the first direction is set to be less than or equal to 3 mm, which can reduce the stacking difficulty of the bent portions of the first isolation section and the bent portions of the second isolation section, thereby reducing the manufacturing difficulty of the electrode assembly, and can reduce the phenomenon of the bent portion of the second isolation section being inserted into the gap formed after the bent portions of the first isolation section and the bent portions of the second isolation section are stacked together, thereby reducing the phenomenon of the gap formed after the bent portions of the first isolation section and the bent portions of the second isolation section being blocked or sealed.

[0017] In some embodiments, the distance from one end of the bent portion of the first isolation segment connected to the body portion of the first isolation segment to one end away from the body portion of the first isolation segment in the first direction is 2mm-8mm; and / or, the distance from one end of the bent portion of the second isolation segment connected to the body portion of the second isolation segment to one end away from the body portion of the second isolation segment in the first direction is 1mm-5mm.

[0018] In the above technical solution, on the one hand, the dimension of the bent portion of the first isolation section in the first direction is set to be greater than or equal to 2mm to reduce the forming difficulty of the bent portion of the first isolation section and to reduce the stacking difficulty of the bent portions of the first and second isolation sections. On the other hand, setting the dimension of the bent portion of the first isolation section in the first direction to be less than or equal to 8mm can reduce the excessive waste of the bent portion of the first isolation section, which is beneficial to optimizing the volume and weight of the electrode assembly and reducing the redundancy of the bent portion of the first isolation section. Similarly, on the one hand, setting the dimension of the bent portion of the second isolation section in the first direction to be greater than or equal to 1mm can reduce the forming difficulty of the bent portion of the second isolation section and to reduce the stacking difficulty of the bent portions of the second and first isolation sections. On the other hand, setting the dimension of the bent portion of the second isolation section in the first direction to be less than or equal to 5mm can reduce the excessive waste of the bent portion of the second isolation section, which is beneficial to optimizing the volume and weight of the electrode assembly and to reducing the redundancy of the bent portion of the second isolation section.

[0019] In some embodiments, the bent portion is provided with at least one through hole, which penetrates the bent portion along the thickness direction of the bent portion.

[0020] In the above technical solution, by providing through holes in the bend of the isolation section, and the through holes having a structure that penetrates the bend along the thickness direction of the bend, the electrolyte can also enter the electrode assembly through the through holes, thereby further reducing the difficulty of the electrolyte entering the electrode assembly from the end near the wall of the flat area, and improving the effect of the electrolyte entering the electrode assembly and wetting multiple electrode segments.

[0021] In some embodiments, at least one through hole on the bend of at least one first isolation segment communicates with at least one through hole on the bend of at least one second isolation segment.

[0022] In the above technical solution, the through holes on the bends of the first isolation section and the second isolation section are interconnected, which can improve the smoothness of the electrolyte entering the electrode assembly through the through holes of the multiple bends, thereby reducing the resistance encountered by the electrolyte when it enters the electrode assembly from the end near the wall of the flat area, which is conducive to further improving the effect of the electrolyte entering the electrode assembly and wetting multiple electrode segments.

[0023] In some embodiments, the diameter of the through hole is 0.2 mm to 1 mm.

[0024] In the above technical solution, on the one hand, setting the diameter of the through hole on the bending part to be greater than or equal to 0.2 mm can reduce the difficulty of setting the through hole on the bending part and facilitate the electrolyte to enter the electrode assembly through the through hole, which is beneficial to improving the smoothness of the electrolyte entering the electrode assembly through the through hole. On the other hand, setting the diameter of the through hole on the bending part to be less than or equal to 1 mm can reduce the phenomenon of excessive waste of through hole size and alleviate the phenomenon that the effect of multiple overlapping bending parts separating the wall and electrode segments is not good due to the excessive size of the through hole.

[0025] In some embodiments, the wall portion is located at the bottom of the electrode assembly along the direction of gravity, and the wall portion is configured to support the electrode assembly.

[0026] In the above technical solution, the wall is a wall of the outer shell located at the bottom of the electrode assembly in the direction of gravity and supporting the electrode assembly. This allows the multiple bends of the isolation sections to be stacked at the bottom of the electrode assembly. With this structure, the battery cell can form an uneven structure at the bottom of the flat area of ​​the electrode assembly through multiple bends of different lengths and stacked arrangement. This allows the end of the flat area of ​​the electrode assembly that is pressed by its own gravity to form channels with different gap sizes, thereby reducing the difficulty for the electrolyte to enter the electrode assembly from the end of the flat area that is pressed, and improving the effect of the electrolyte wetting the entire electrode assembly.

[0027] In some embodiments, the battery cell further includes a support member; the support member is disposed between the electrode assembly and the wall portion in the thickness direction of the wall portion and abuts against the electrode assembly; the support member is provided with at least one groove, and along the thickness direction of the wall portion, the support member has a first surface facing the electrode assembly, and the groove penetrates the first surface and forms a first opening.

[0028] In the above technical solution, a support member is provided between the wall and the electrode assembly, so that the support member can play a supporting and separating role between the electrode assembly and the wall, which helps to reduce the risk of overlap and collision between the electrode assembly and the wall. In particular, by providing a groove on the support member, and the groove penetrating the first surface of the support member facing the electrode assembly and forming a first opening, the groove can play a role in buffering the electrolyte, and the electrolyte contained in the groove can enter the electrode assembly through the gap channel between multiple bends, which helps to reduce the difficulty of the end of the electrode assembly near the wall being wetted by the electrolyte, thereby improving the wetting effect of the electrolyte on the electrode assembly.

[0029] In some embodiments, the battery cell further includes an insulating member covering the outside of the electrode assembly, and the insulating member includes an insulating portion located between the wall portion and the electrode assembly; the support member is located between the insulating portion and the electrode assembly along the thickness direction of the wall portion.

[0030] In the above technical solution, by covering the outside of the electrode assembly with an insulating component, the insulating component can effectively isolate the electrode assembly from the outer shell, thus mitigating the risk of short circuits between the electrode assembly and the outer shell. Specifically, by configuring the support component as a structure located between the electrode assembly and the insulating portion of the insulating component, with the support component positioned inside the insulating component, the battery cell employs this structure. Firstly, the support component acts as a separator between the insulating component and the electrode assembly, alleviating the excessive resistance encountered when the electrolyte enters the electrode assembly from the end near the wall after the insulating portion is tightly pressed against or compressed. Secondly, it facilitates direct contact between the multiple bends and the support component, allowing the electrolyte contained in the groove to enter the electrode assembly through the gaps between the bends. This further reduces the difficulty of wetting the end of the electrode assembly near the wall with electrolyte, thereby improving the wetting effect of the electrolyte on the electrode assembly.

[0031] In some embodiments, the support member and the insulating portion are separately disposed; or, the support member and the insulating portion are integrally formed.

[0032] In the above technical solution, by setting the insulating parts of the support and the insulating part as separate structures, it is beneficial to reduce the difficulty of setting the support between the insulating part and the electrode assembly, thereby reducing the assembly difficulty of the battery cell, and also reducing the difficulty of setting the groove on the first surface of the support, thereby reducing the molding difficulty of the support. By setting the insulating parts of the support and the insulating part as an integral structure, it is beneficial to improve the overall structural stability between the support and the insulating part, thereby improving the support effect of the support on the electrode assembly, and reducing the risk of the support moving or shifting between the insulating part and the electrode assembly during use.

[0033] In some embodiments, along the thickness direction of the wall portion, at least a portion of at least one of the bent portions is disposed corresponding to the first opening of at least one of the grooves.

[0034] In the above technical solution, by setting at least a portion of at least one of the multiple bends in the wall thickness direction to correspond to the first opening of at least one groove, the difficulty of the electrolyte contained in the groove entering the gap channel between the multiple bends is reduced, thereby facilitating the electrolyte contained in the groove to directly enter the electrode assembly through the gap channel between the multiple bends, which is beneficial to further improve the wetting effect of the electrolyte on the electrode assembly.

[0035] In some embodiments, along the thickness direction of the wall portion, at least a portion of the bend of at least one of the first isolation segments is located within at least one of the grooves.

[0036] In the above technical solution, by setting at least a portion of the bent portion of the first isolation section with a longer dimension in the first direction as a structure located in the groove, at least one first isolation section can come into contact with the electrolyte contained in the groove, thereby facilitating the electrolyte contained in the groove to climb through the first isolation section into the gap channel between the multiple bends and then enter the electrode assembly, which is beneficial to further improve the wetting effect of the electrolyte on the electrode assembly.

[0037] In some embodiments, the groove extends along the first direction.

[0038] In the above technical solution, by setting the groove to extend along the first direction, the extension direction of the groove is parallel to the stacking direction of multiple electrode segments, which facilitates the electrolyte contained in the groove to wet multiple electrode segments, thereby improving the overall wetting effect of the electrode assembly and enhancing the performance and reliability of the battery cell.

[0039] In some embodiments, the first surface is provided with a plurality of the grooves, at least some of the grooves being spaced apart along the first direction; and / or, the first surface is provided with a plurality of the grooves, at least some of the grooves being spaced apart along the second direction, wherein the thickness direction of the wall portion, the first direction, and the second direction are perpendicular to each other.

[0040] In the above technical solution, by providing multiple grooves extending along a first direction and spaced apart on the first surface of the support member, the multiple grooves on the support member can be arranged to correspond to more electrode segments in the thickness direction of the wall, thereby facilitating the wetting of multiple electrode segments by the electrolyte contained in the grooves, which is beneficial to further improve the overall wetting effect of the electrode assembly. By providing multiple grooves spaced apart along a second direction on the first surface of the support member, the multiple bends are provided with grooves at multiple positions in the second direction, thereby facilitating the entry of electrolyte into the electrode assembly from different positions through the gap channels between the multiple bends, which is beneficial to further improve the wetting effect of the electrolyte on the electrode assembly.

[0041] In some embodiments, the support member further has a second surface facing away from the electrode assembly in the thickness direction of the wall portion, and the support member further includes an outer peripheral surface connecting the first surface and the second surface, wherein at least one end of the groove in the first direction penetrates the outer peripheral surface and forms a second opening.

[0042] In the above technical solution, by setting the groove to penetrate the outer peripheral surface of the support member at least one end in the first direction, the electrolyte can enter the groove from the area penetrated by the groove on the outer peripheral surface of the support member, thereby reducing the difficulty of the electrolyte entering the groove and improving the smoothness of the electrolyte entering the groove, thereby further improving the wetting effect of the electrolyte on the end of the electrode assembly near the wall.

[0043] In some embodiments, the support member includes a plurality of support portions and at least one connecting portion, the plurality of support portions being spaced apart along a second direction, and each pair of adjacent support portions being connected by the connecting portion, the thickness direction of the wall portion being perpendicular to the first direction and the second direction; along the second direction, at least one groove is formed between each pair of adjacent support portions.

[0044] In the above technical solution, the support member is provided with a plurality of support portions arranged at intervals along the second direction, and each pair of adjacent support portions is connected by a connecting portion, so that at least one groove can be formed between the two adjacent support portions. The support member with this structure is convenient to form grooves on the support member, the structure is simple and easy to manufacture. On the other hand, it allows the electrolyte to enter the groove from at least one end of the support member in the first direction and then enter the interior of the electrode assembly through the gap channel between the multiple bends to wet the multiple electrode segments. This helps to increase the path of the electrolyte into the electrode assembly, thereby further reducing the difficulty of the electrolyte to wet the end of the electrode assembly near the wall, so as to further improve the overall wetting effect of the electrode assembly.

[0045] In some embodiments, the two ends of the connecting portion are respectively connected to the middle of two adjacent support portions, and two grooves are formed between the two adjacent support portions, with the two grooves located on both sides of the connecting portion in the first direction.

[0046] In the above technical solution, by connecting the two ends of the connecting part to the middle position of two adjacent support parts, two grooves are formed between the two adjacent support parts and spaced apart along the first direction. This allows the electrolyte to enter the corresponding grooves from the two ends of the support part in the first direction and then enter the interior of the electrode assembly through the gap channel between multiple bends to wet multiple electrode segments. This is beneficial to further increase the path of the electrolyte into the electrode assembly.

[0047] In some embodiments, along the first direction, the outer peripheral surface includes a first side surface and a second side surface disposed opposite to each other, and the distance between at least one of the connecting portions and the first side surface is not equal to the distance between the connecting portion and the second side surface.

[0048] In the above technical solution, by setting the distance between at least one connecting part and the first side and the distance between it and the second side to be unequal, the at least one connecting part is set to a position offset from the middle position of the support member in the first direction, so that the groove can extend to the middle position of the support member in the first direction, thereby facilitating the supply of electrolyte to the middle position of the electrode assembly in the first direction within the battery cell, which is beneficial to improving the effect of the electrode assembly being wetted by the electrolyte.

[0049] In some embodiments, the support member includes a plurality of the connecting portions, the plurality of connecting portions including at least one first connecting portion and at least one second connecting portion; along the first direction, the outer peripheral surface includes a first side surface and a second side surface disposed opposite to each other, and the distance between each first connecting portion and the first side surface and the distance between each second connecting portion and the first side surface are not equal.

[0050] In the above technical solution, by setting the distance between each first connecting part and the first side and the distance between each second connecting part and the first side to be unequal, the first connecting part and the second connecting part are arranged in a staggered manner in the second direction, which can disperse the pressure of the electrode assembly on the support, reduce the stress concentration phenomenon of the support, and improve the structural strength of the support, thereby reducing the risk of breakage or deformation of the support during use.

[0051] In some embodiments, the support has a central axis parallel to the second direction; at least one first connecting portion is located on one side of the central axis in the first direction, and at least one second connecting portion is located on the other side of the central axis in the first direction.

[0052] In the above technical solution, by setting the first connecting part and the second connecting part to be located on both sides of the central axis of the support member in the first direction, the opposite sides of the support member along the first direction have good structural strength, which can better disperse the pressure of the electrode assembly on the support member, reduce the phenomenon of stress concentration in the support member during use, and reduce the risk of deformation of the support member, thereby improving the reliability of the support member.

[0053] In some embodiments, there are multiple first connecting portions and multiple second connecting portions, and the first connecting portions and the second connecting portions are alternately arranged along the second direction.

[0054] In the above technical solution, by setting the first connecting part and the second connecting part to be arranged alternately along the second direction, each pair of adjacent connecting parts in the multiple connecting parts are staggered in the second direction, which can effectively improve the structural strength of the support, help reduce stress concentration in the support during use, and reduce the risk of deformation of the support.

[0055] In some embodiments, there are multiple first connecting portions, which are arranged along the second direction and are all located on the same straight line; and / or, there are multiple second connecting portions, which are arranged along the second direction and are all located on the same straight line.

[0056] In the above technical solution, by arranging multiple first connecting parts along the second direction and all located on the same straight line, the arrangement of the multiple first connecting parts is regular, which helps to reduce the processing difficulty of the support and can better distribute the pressure of the electrode assembly on the support, thereby reducing stress concentration in the support during use and reducing the risk of deformation of the support. Similarly, by arranging multiple second connecting parts along the second direction and all located on the same straight line, the arrangement of the multiple second connecting parts is regular, which helps to reduce the processing difficulty of the support and can better distribute the pressure of the electrode assembly on the support, thereby reducing stress concentration in the support during use and reducing the risk of deformation of the support.

[0057] In some embodiments, along the thickness direction of the wall portion, the support member further has a second surface facing away from the electrode assembly, and at least one of the grooves penetrates the second surface and forms a third opening.

[0058] In the above technical solution, by setting at least one groove to penetrate the second surface of the support member away from the electrode assembly, the at least one groove is a structure that penetrates the entire support member along the thickness direction of the wall. On the one hand, it can improve the ability of the groove to buffer electrolyte, thereby increasing the storage capacity of the groove. On the other hand, it facilitates the electrolyte to enter the groove from the side of the support member away from the electrode assembly and then enter the interior of the electrode assembly through the gap channel between multiple bends to wet multiple electrode segments. This helps to reduce the difficulty of electrolyte entering the groove, thereby further reducing the difficulty of electrolyte wetting the end of the electrode assembly near the wall, and thus further improving the overall wetting effect of the electrode assembly.

[0059] In some embodiments, the support member is provided with a positioning hole that penetrates the support member along the thickness direction of the wall portion, and the positioning hole and the groove are not connected.

[0060] In the above technical solution, the support component is also provided with positioning holes, which can be used to position the support component. On the one hand, this can improve the assembly accuracy of the support component into the shell, thereby improving the assembly quality of the battery cell. On the other hand, it can improve the accuracy of machining grooves on the support component, thereby improving the production quality of the support component. In particular, by setting the positioning holes and grooves to be non-interconnected, the interference of the grooves on the positioning holes during use can be reduced, and the phenomenon of reduced structural strength of the support component can be reduced.

[0061] Secondly, embodiments of this application also provide a battery device, including the aforementioned battery cell.

[0062] Thirdly, embodiments of this application also provide an electrical device, including the aforementioned battery cell, wherein the battery cell is used to provide electrical energy. Attached Figure Description

[0063] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0064] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0065] Figure 2 Exploded views of the structure of the battery device provided in some embodiments of this application;

[0066] Figure 3This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0067] Figure 4 Exploded views of the structure of a single battery cell provided in some embodiments of this application;

[0068] Figure 5 Cross-sectional views of a battery cell provided in some embodiments of this application;

[0069] Figure 6 A cross-sectional view of the main body of an electrode assembly provided in some embodiments of this application, perpendicular to the thickness direction of the wall portion;

[0070] Figure 7 A partial cross-sectional view of the main body of an electrode assembly provided in some embodiments of this application, perpendicular to the second direction;

[0071] Figure 8 for Figure 7 A partially enlarged view of the main body of the electrode assembly shown;

[0072] Figure 9 A cross-sectional view of the main body of an electrode assembly provided in some embodiments of this application, perpendicular to the thickness direction of the wall portion;

[0073] Figure 10 A partial cross-sectional view of an electrode assembly (before the isolation section is bent) provided in some embodiments of this application;

[0074] Figure 11 A schematic diagram of the structure of the support member for a battery cell provided in some embodiments of this application;

[0075] Figure 12 This is a front view of the support member of a battery cell provided in some embodiments of this application in the thickness direction of the wall portion.

[0076] Icons: 1000 - Vehicle; 100 - Battery assembly; 10 - Housing; 11 - First housing body; 12 - Second housing body; 20 - Battery cell; 21 - Casing; 211 - Wall; 212 - Housing; 2121 - Fourth opening; 213 - End cap; 22 - Electrode assembly; 22a - Straight area; 22b - Bending area; 221 - Main body; 221a - Electrode segment; 221b - Bending segment; 221c - Separator segment; 2211 - Positive electrode; 2211a - First electrode segment; 2211b - First bending segment; 2212 - Negative electrode; 2212a - Second electrode segment; 2212b - Second bending segment; 2213 - Separator; 2213a - First separator; 2213b - Second separator; 22131 - Main body; 22132 - Bending section; 2 2133-First isolation section; 22134-Second isolation section; 22135-Through hole; 222-Positive electrode tab; 223-Negative electrode tab; 23-Electrode terminal; 24-Current collector; 25-Pressure relief component; 26-Insulating component; 261-Insulating part; 27-Supporting component; 271-First surface; 2711-First opening; 272-Groove; 273-Second surface; 2731-Third opening; 274-Outer peripheral surface; 2741-First side surface; 2742-Second side surface; 2743-Second opening; 275-Supporting part; 276-Connecting part; 2761-First connecting part; 2762-Second connecting part; 277-Positioning hole; 200-Controller; 300-Motor; X-Thickness direction of the wall; Y-First direction; Z-Second direction; R-Wounding direction. Detailed Implementation

[0077] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0078] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0079] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0080] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0081] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0082] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0083] In this application, "multiple" means two or more (including two).

[0084] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0085] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0086] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, helps prevent short circuits to some extent while allowing active ions to pass through.

[0087] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0088] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0089] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, or titanium, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0090] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxide may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM)622 LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811 ), lithium nickel cobalt aluminum oxide (such as LiNi) 0.85 Co 0.15 Al 0.05 At least one of O2 and its modified compounds.

[0091] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloys, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, lithium source material, potassium metal, or sodium metal can also be filled and / or deposited within the foamed metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0092] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0093] As an example, the negative electrode current collector can be a metal foil, a foamed metal, or a composite current collector. For example, as a metal foil, it can be silver-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrodes, or titanium, etc. Foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloys, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (copper, copper alloys, nickel, nickel alloys, titanium, titanium alloys, silver and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0094] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0095] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0096] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as battery negative electrode active materials may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0097] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0098] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0099] In some embodiments, the separator is a separator membrane. The separator membrane can be of various types, and any known porous separator membrane with good chemical and mechanical stability can be selected.

[0100] As an example, the material of the separator may include at least one of glass fiber, nonwoven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator may be a single-layer film or a multi-layer composite film. When the separator is a multi-layer composite film, the materials of each layer may be the same or different. The separator may be a separate component located between the positive and negative electrodes, or it may be attached to the surfaces of the positive and negative electrodes.

[0101] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte comprises an electrolyte salt and a solvent.

[0102] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0103] In some embodiments, the solvent may include at least one selected from ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. Ether solvents may include one or more selected from ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ethers.

[0104] In some implementations, the electrode assembly has a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0105] In some implementations, the electrode assembly has a stacked structure.

[0106] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0107] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0108] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0109] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0110] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0111] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0112] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0113] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0114] As an example, a battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include, but are not limited to, square battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0115] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0116] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells into a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0117] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0118] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0119] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0120] As an example, the enclosure may include a first enclosure body and a second enclosure body. The first enclosure body and the second enclosure body are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, which can be either sealed or unsealed. The first enclosure body may be a top cover or a bottom plate.

[0121] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0122] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0123] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0124] Battery devices possess outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide applicability, and low self-discharge coefficient, making them an important component of today's new energy development. The development of battery technology must simultaneously consider multiple design factors, such as performance parameters like energy density, cycle life, discharge capacity, and charge / discharge rate. Furthermore, the reliability of the battery device must also be taken into account.

[0125] For a typical battery cell, it usually includes a casing and an electrode assembly housed within the casing, which is also filled with electrolyte. In related technologies, to reduce the risk of short circuits between the electrode assembly and the casing, an insulating film is usually wrapped around the outside of the electrode assembly to separate it from the casing. Furthermore, to improve the assembly quality of the battery cell and reduce the risk of damage during use, a base plate is usually provided at the bottom of the electrode assembly to support it, thereby reducing the risk of impacts and improving heat dissipation at the bottom of the electrode assembly. However, this type of battery cell structure... Because the insulating film is pressed tightly between the base plate and the electrode assembly, especially in large-capacity battery cells where the electrode assembly is large in volume or height, the tightness between the electrode assembly and the insulating film or shell is higher. This results in extremely poor fluidity of the electrolyte at the bottom of the electrode assembly, making it less effective for the electrolyte to penetrate and wet the electrode assembly. Consequently, the electrode assembly is prone to poor electrolyte wetting during cycle use, leading to poor performance of the battery cell and even increasing the risk of metal precipitation during use, thus hindering the reliability of the battery cell.

[0126] Based on the above considerations, in order to solve the problems of poor performance and low reliability of battery cells, this application provides a battery cell including a casing, an electrolyte, and at least one electrode assembly. The casing has a wall. The electrolyte is contained within the casing. The electrode assembly is disposed within the casing and has a flat region, which includes multiple electrode segments and multiple isolation segments. The multiple electrode segments are stacked along a first direction, and an isolation segment is provided between each pair of adjacent electrode segments. Multiple pole segments include alternating first pole segments and second pole segments arranged along a first direction. The first pole segments and second pole segments have opposite polarities, and the end of the first pole segment near the wall in the thickness direction of the wall does not extend beyond the second pole segment. The isolation segment is bent to form an interconnected body portion and a bent portion. The body portion is located between two adjacent second pole segments, and the bent portion is located on the side of the second pole segment near the wall. The bent portions of two adjacent isolation segments are stacked. The multiple isolation segments include first isolation segments and second isolation segments. The distance from the end of the bent portion of the first isolation segment connected to the body portion of the first isolation segment to the end away from the body portion of the first isolation segment in the first direction is greater than the distance from the end of the bent portion of the second isolation segment connected to the body portion of the second isolation segment to the end away from the body portion of the second isolation segment in the first direction. Along the first direction, at least one set of two adjacent first isolation segments are provided with a second isolation segment. The first direction is perpendicular to the thickness direction of the wall.

[0127] In this type of battery cell, the flat region of the electrode assembly has multiple isolation segments arranged along a first direction. Each isolation segment is bent to form a body portion located between two adjacent second electrode segments and a bent portion connected to one end of the body portion. The bent portion is located on the side of the second electrode segment closer to the wall portion in the thickness direction of the wall portion. The bent portions of adjacent isolation segments are stacked, allowing the multiple bent portions to also separate the wall portion and the electrode segment. This structure of the isolation segment improves the separation effect between adjacent electrode segments, reducing the risk of overlap between adjacent electrode segments near the wall portion. Specifically, the multiple isolation segments are configured as first and second isolation segments including first isolation segments and second isolation segments with different dimensions of the bent portion in the first direction, and at least one set of adjacent first isolation segments is provided with a bend in the first direction that is sized in the first direction. The shorter second isolation section allows multiple bends on the side of the multiple electrode segments near the wall to have structures with different dimensions in the first direction. This enables the flat area of ​​the electrode assembly to have an uneven structure near the wall, creating channels with different gap sizes between the flat area of ​​the electrode assembly and the wall in the thickness direction of the wall. This facilitates the entry of electrolyte into the electrode assembly and wetting of the multiple electrode segments, reducing the resistance encountered by the electrolyte when flowing between the electrode assembly and the wall. As a result, the battery cell with this structure can improve the wetting effect of the electrolyte entering the electrode assembly, alleviating the phenomenon of poor electrolyte wetting effect during the cycle of use, and reducing the risk of metal precipitation during the use of the battery cell. This is beneficial to improving the performance and reliability of the battery cell.

[0128] The battery cells disclosed in this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system comprising the battery cells and battery devices disclosed in this application can be used to construct such an electrical device. This helps alleviate the problem of poor electrolyte wetting of the electrode components of the battery cells during use, thereby improving the performance and reliability of the battery cells.

[0129] This application provides an electrical device that uses a single battery cell or battery assembly as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0130] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0131] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle 1000. The battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to supply power to the vehicle 1000; for example, the battery device 100 can serve as the operating power source or general power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 controls the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0132] In some embodiments of this application, the battery device 100 can not only serve as the operating power or power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0133] Please refer to Figure 2 and Figure 3 , Figure 2 This is an exploded view of the structure of the battery device 100 provided in some embodiments of this application. Figure 3 This is a schematic diagram of the structure of a battery cell 20 provided in some embodiments of this application. The battery device 100 includes a housing 10 and battery cells 20, which are housed within the housing 10.

[0134] The housing 10 provides assembly space for the battery cell 20, and can adopt various structures. In some embodiments, the housing 10 may include a first housing body 11 and a second housing body 12, which overlap each other, and together define an assembly space for accommodating the battery cell 20. The second housing body 12 may be a hollow structure open at one end, and the first housing body 11 may be a plate-like structure, with the first housing body 11 covering the open side of the second housing body 12 so that the first housing body 11 and the second housing body 12 together define the assembly space; alternatively, the first housing body 11 and the second housing body 12 may both be hollow structures open on one side, with the open side of the first housing body 11 covering the open side of the second housing body 12.

[0135] Of course, the box 10 formed by the first box body 11 and the second box body 12 can be of various shapes, such as a cylinder, a cuboid, or a cube. For example, in... Figure 2 In the middle, the shape of box 10 is a cuboid.

[0136] In the battery device 100, there can be one or more battery cells 20 disposed within the housing 10. When there are multiple battery cells 20 disposed within the housing 10, they can be connected in series, in parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery device 100 can also consist of multiple battery cells 20 first connected in series, in parallel, or in a mixed configuration to form battery modules, and then multiple battery modules are connected in series, in parallel, or in a mixed configuration to form a whole, which is then housed within the housing 10.

[0137] In some embodiments, the battery device 100 may also include other structures. For example, the battery device 100 may also include a busbar for connecting multiple battery cells 20 to achieve electrical connection between the multiple battery cells 20.

[0138] Each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 20 can be in the form of a cuboid, cylinder, prism, or other shapes. For example, in... Figure 3 In the middle, the battery cell 20 has a cuboid structure.

[0139] According to some embodiments of this application, refer to Figure 3 Please refer to further details. Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 , Figure 4 This is an exploded view of the structure of a battery cell 20 provided in some embodiments of this application. Figure 5 This is a cross-sectional view of a battery cell 20 provided in some embodiments of this application. Figure 6 This is a cross-sectional view of the main body 221 of the electrode assembly 22 provided in some embodiments of this application, perpendicular to the thickness direction X of the wall portion. Figure 7 A partial cross-sectional view of the main body 221 of the electrode assembly 22 provided in some embodiments of this application, perpendicular to the second direction Z. Figure 8 for Figure 7The image shows a partial enlarged view of the main body 221 of the electrode assembly 22. This application provides a battery cell 20, which includes a housing 21, an electrolyte, and at least one electrode assembly 22. The housing 21 has a wall 211. The electrolyte is contained within the housing 21. The electrode assembly 22 is disposed within the housing 21 and has a flat region 22a. The flat region 22a includes multiple electrode segments 221a and multiple isolation segments 221c. The multiple electrode segments 221a are stacked along a first direction Y, and an isolation segment 221c is provided between every two adjacent electrode segments 221a. Multiple pole segments 221a include alternating first pole segments 2211a and second pole segments 2212a along a first direction Y. The first pole segments 2211a and second pole segments 2212a have opposite polarities, and the end of the first pole segment 2211a near the wall portion 211 in the thickness direction X of the wall portion does not extend beyond the second pole segment 2212a. Isolation segments 221c are bent to form interconnected body portions 22131 and bent portions 22132. The body portion 22131 is located between two adjacent second pole segments 2212a, and the bent portion 22132 is located on the side of the second pole segment 2212a near the wall portion 211. The bent portions 22132 of two adjacent isolation segments 221c are stacked. Multiple isolation segments 221c include... The first isolation section 22133 and the second isolation section 22134 are included. The distance from the end of the bent portion 22132 of the first isolation section 22133 connected to the body portion 22131 of the first isolation section 22133 to the end of the body portion 22131 away from the first isolation section 22133 in the first direction Y is greater than the distance from the end of the bent portion 22132 of the second isolation section 22134 connected to the body portion 22131 of the second isolation section 22134 to the end of the body portion 22131 away from the second isolation section 22134 in the first direction Y. The second isolation section 22134 is provided between at least one pair of adjacent first isolation sections 22133 along the first direction Y. The first direction Y is perpendicular to the thickness direction X of the wall portion.

[0140] The outer casing 21 serves to house the electrolyte and electrode assembly 22. The outer casing 21 can have various structural forms, such as a cylinder, cuboid, or prism. Similarly, the outer casing 21 can be made of various materials, such as copper, iron, aluminum, steel, or aluminum alloy.

[0141] In some embodiments, the housing 21 may include a housing 212 and an end cap 213. The housing 212 has an internal cavity for accommodating the electrode assembly 22 and has a fourth opening 2121. That is, the housing 212 is a hollow structure with a fourth opening 2121 at one end. The end cap 213 covers the fourth opening 2121 of the housing 212 and forms a sealed connection to form a closed space for accommodating the electrode assembly 22 and the electrolyte.

[0142] The housing 212 includes an integrally formed side wall and a bottom wall. The side wall surrounds the bottom wall, one end of the side wall is connected to the bottom wall, and the other end forms a fourth opening 2121. The bottom wall and the end cap 213 are disposed opposite each other. The side wall and the bottom wall together define a receiving cavity, in which the electrode assembly 22 is received.

[0143] It should be noted that the wall portion 211 of the outer casing 21 can be an end cap 213, or it can be a side wall or bottom wall of the casing 212. For example, in... Figure 4 In the middle, the wall portion 211 is the bottom wall of the housing 212, that is, the wall portion 211 is a wall that is disposed opposite to the end cover 213 of the housing 212.

[0144] For example, the electrode assembly 22 is placed on the wall portion 211, which is configured to support the electrode assembly 22. That is, the wall portion 211 is a structure located below the electrode assembly 22 in the direction of gravity or approximately in the direction of gravity, so that the wall portion 211 can support the electrode assembly 22.

[0145] Optionally, the housing 212 can be of various shapes, such as a cylinder, cuboid, or prism. The shape of the housing 212 can be determined according to the specific shape of the electrode assembly 22. For example, if the electrode assembly 22 is a cylindrical structure, a cylindrical housing 212 can be selected; if the electrode assembly 22 is a cuboid structure, a cuboid housing 212 can be selected. Of course, the structure of the end cap 213 can also be various, such as a plate-like structure or a hollow structure with one end open. Exemplarily, in this embodiment, the outer shell 21 formed by the housing 212 and the end cap 213 has a cuboid structure.

[0146] Of course, it is understandable that the outer casing 21 is not limited to the structure described above. The outer casing 21 can also be other structures. For example, the outer casing 21 can include a housing 212 and two end caps 213. The housing 212 is a hollow structure with a fourth opening 2121 formed on opposite sides. One end cap 213 is fitted onto one of the fourth openings 2121 of the housing 212 and forms a sealed connection to form a closed space for accommodating the electrode assembly 22 and the electrolyte. That is, the housing 212 has a fourth opening 2121 formed on opposite sides, and the two end caps 213 are fitted onto the opposite sides of the housing 212 to close the corresponding fourth opening 2121.

[0147] In this embodiment of the application, the electrode assembly 22 includes a main body 221, a positive electrode tab 222 and a negative electrode tab 223. The main body 221 is the main component of the electrode assembly 22 for chemical reactions to occur inside the battery cell 20. The positive electrode tab 222 and the negative electrode tab 223 are both connected to the main body 221 and are spaced apart.

[0148] Optionally, the structure of the main body 221 of the electrode assembly 22 can be various. The main body 221 of the electrode assembly 22 can be a wound structure formed by winding the positive electrode 2211, the negative electrode 2212 and the separator 2213, or it can be a stacked structure formed by alternately stacking the positive electrode 2211, the negative electrode 2212 and the separator 2213. The separator 2213 is disposed between the positive electrode 2211 and the negative electrode 2212 to insulate and isolate the positive electrode 2211 and the negative electrode 2212.

[0149] For example, the separator 2213 is a separator membrane, and the main material of the separator membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride.

[0150] For example, in Figure 4 and Figure 5 In this embodiment, the positive electrode 222 and the negative electrode 223 are both connected to the same end of the main body 221 in the thickness direction X of the wall. Of course, in other embodiments, the positive electrode 222 and the negative electrode 223 may also be structures that are respectively connected to the two ends of the main body 221 in the thickness direction X of the wall.

[0151] The positive electrode tab 222 of the electrode assembly 22 is a multilayer metal foil structure connected to one end of the positive electrode 2211 in the thickness direction X of the wall portion. Correspondingly, the negative electrode tab 223 of the electrode assembly 22 is a multilayer metal foil structure connected to one end of the negative electrode 2212 in the thickness direction X of the wall portion. It should be noted that the positive electrode tab 222 and the positive electrode plate 2211 can be separate structures. For example, the positive electrode tab 222 and the positive electrode plate 2211 can be welded together. Alternatively, the positive electrode tab 222 and the positive electrode plate 2211 can be integrally formed. For example, the positive electrode tab 222 and the positive electrode plate 2211 can be formed by integrally cutting the same metal foil to form the positive electrode tab 222 and the positive electrode current collector. Similarly, the negative electrode tab 223 and the negative electrode plate 2212 can be separate structures. For example, the negative electrode tab 223 and the negative electrode plate 2212 can be welded together. Alternatively, the negative electrode tab 223 and the negative electrode plate 2212 can be integrally formed. For example, the negative electrode tab 223 and the negative electrode plate 2212 can be formed by integrally cutting the same metal foil to form the negative electrode tab 223 and the negative electrode current collector.

[0152] In this embodiment, the electrode assembly 22 has a flat region 22a, that is, the flat region 22a is the flat portion of the main body 221 of the electrode assembly 22. For example, in... Figure 6In this structure, electrode assembly 22 has a wound structure, and the central axis of the winding of electrode assembly 22 extends along the thickness direction X of the wall portion. Correspondingly, the main body portion 221 also has two bending regions 22b, and the two bending regions 22b are respectively connected to the two opposite ends of the straight region 22a in the second direction Z. The thickness direction X, the first direction Y, and the second direction Z of the wall portion are perpendicular to each other. Of course, if electrode assembly 22 has a stacked structure, refer to... Figure 9 As shown, Figure 9 The cross-sectional view of the main body 221 of the electrode assembly 22 provided in some embodiments of this application, perpendicular to the thickness direction X of the wall portion, shows that the main body 221 of the electrode assembly 22 is entirely a flat region 22a, that is, the main body 221 of the electrode assembly 22 only includes the flat region 22a.

[0153] The flat region 22a includes a plurality of electrode segments 221a stacked along the first direction Y. Each electrode segment 221a includes a first electrode segment 2211a and a second electrode segment 2212a with opposite polarities. The first electrode segments 2211a and the second electrode segments 2212a are stacked and alternately arranged along the first direction Y. It should be noted that if the electrode assembly 22 has a wound structure, see [reference needed]. Figure 6 As shown, the multiple electrode segments 221a are multiple straight segments of the positive electrode 2211 located in the straight region 22a and multiple straight segments of the negative electrode 2212 located in the straight region 22a. In other words, the electrode segment 221a is a part of the positive electrode 2211 located in the straight region 22a or a part of the negative electrode 2212 located in the straight region 22a.

[0154] The multiple electrode segments 221a include multiple first electrode segments 2211a with the same polarity. The first electrode segments 2211a are the portions of the positive electrode 2211 located in the flat region 22a. The multiple electrode segments 221a also include multiple second electrode segments 2212a. The second electrode segments 2212a have the opposite polarity to the first electrode segments 2211a. The second electrode segments 2212a are the portions of the negative electrode 2212 located in the flat region 22a. Correspondingly, the main body 221 also includes a plurality of bent segments 221b, which include a first bent segment 2211b and a second bent segment 2212b. In the winding direction R of the electrode assembly 22, the first bent segment 2211b connects two adjacent first electrode segments 2211a, and the first bent segment 2211b and the first electrode segments 2211a are alternately arranged. Correspondingly, in the winding direction R of the electrode assembly 22, the second bent segment 2212b connects two adjacent second electrode segments 2212a, and the second bent segment 2212b and the second electrode segments 2212a are alternately arranged.

[0155] It should be noted that if the electrode assembly 22 is a stacked structure, then the multiple electrode segments 221a are multiple positive electrode plates 2211 and multiple negative electrode plates 2212 of the electrode assembly 22. Correspondingly, the first electrode segment 2211a is a positive electrode plate 2211, the second electrode segment 2212a is a negative electrode plate 2212, and the first electrode segment 2211a and the second electrode segment 2212a are arranged in an alternating stacked structure along the first direction Y.

[0156] The end of the first pole segment 2211a near the wall portion 211 in the thickness direction X of the wall portion does not extend beyond the second pole segment 2212a. That is to say, in the thickness direction X of the wall portion, the second pole segment 2212a can be a structure that extends beyond the end of the first pole segment 2211a near the wall portion 211, or it can be a structure in which the end of the second pole segment 2212a near the wall portion 211 and the end of the first pole segment 2211a near the wall portion 211 are flush with each other.

[0157] For example, in Figure 8 In the first electrode segment 2211a, at least a portion of the positive electrode 2211 is formed, and the second electrode segment 2212a is at least a portion of the negative electrode 2212. Correspondingly, in order to reduce the risk of metal element precipitation during the use of the electrode assembly 22, the second electrode segment 2212a is a structure that extends beyond the end of the first electrode segment 2211a near the wall 211 in the thickness direction X of the wall portion.

[0158] The battery cell 20 includes at least one electrode assembly 22, meaning that the number of electrode assemblies 22 housed within the housing 21 can be one or more. For example, in... Figure 4 In this structure, the electrode assembly 22 has a wound structure. Correspondingly, there can be one or more electrode assemblies 22 housed in the outer casing 21. After the positive electrode 2211 and negative electrode 2212 of the main body portion 221 of each electrode assembly 22 are wound and formed, the tail end of the separator 2213 of the main body portion 221 of each electrode assembly 22 will continue to be wound and correspondingly cover the outside of the positive electrode 2211 and negative electrode 2212 to form the main body portion 221 of a single electrode assembly 22. See [link to relevant documentation]. Figure 4 As shown, two electrode assemblies 22 are disposed within the casing 21 of the battery cell 20. The two electrode assemblies 22 are stacked along the first direction Y. Of course, in other embodiments, the electrode assemblies 22 housed within the casing 21 can be three, four, five, six, seven, or eight, etc. It should be noted that, in this embodiment, the length direction of the main body portion 221 of the electrode assembly 22 is the thickness direction X of the wall portion, the thickness direction of the main body portion 221 of the electrode assembly 22 is the first direction Y, and the width direction of the main body portion 221 of the electrode assembly 22 is the second direction Z. It should be noted that if the electrode assembly 22 has a stacked structure, the number of electrode assemblies 22 housed within the casing 21 is usually one.

[0159] In this embodiment, the flat region 22a further includes a plurality of isolation segments 221c, and an isolation segment 221c is provided between each pair of adjacent pole segments 221a. It should be noted that the isolation segment 221c is the part of the isolation member 2213 located in the flat region 22a. The plurality of isolation segments 221c are arranged along the first direction Y, and the isolation member 2213 is a structure that separates the positive electrode 2211 and the negative electrode 2212, so that an isolation segment 221c is provided between each pair of adjacent pole segments 221a. That is, the isolation member 2213 includes a plurality of isolation segments 221c located in the flat region 22a and arranged along the first direction Y, and each isolation segment 221c is used to separate the adjacent first pole segment 2211a and second pole segment 2212a.

[0160] If the electrode assembly 22 is a wound structure, the electrode assembly 22 includes two isolation members 2213, and the negative electrode sheet 2212 is clamped between the two isolation members 2213. The portions of the two isolation members 2213 located in the flat region 22a are isolation segments 221c. Correspondingly, each isolation member 2213 also includes a connecting segment located in the bending region 22b, and the connecting segment connects two adjacent isolation segments 221c in the winding direction R of the electrode assembly 22. If the electrode assembly 22 is a stacked structure, the electrode assembly 22 includes a plurality of isolation members 2213 arranged along the first direction Y. One isolation member 2213 is provided between each pair of adjacent electrode segments 221a. Correspondingly, the isolation member 2213 is an isolation segment 221c.

[0161] The isolation segment 221c is bent to form an interconnected body portion 22131 and a bent portion 22132. The body portion 22131 is located between two adjacent second pole segments 2212a, and the bent portion 22132 is located on the side of the second pole segment 2212a near the wall portion 211. The bent portions 22132 of the two adjacent isolation segments 221c are stacked. That is, the isolation segment 221c of the isolation member 2213 located in the flat region 22a has a structure formed by bending into two parts. The part of the isolation segment 221c that is sandwiched between two adjacent pole segments 221a and located between two adjacent second pole segments 2212a in the first direction Y is the body portion 22131 of the isolation segment 221c. That is, the end of the body portion 22131 connected to the bent portion 22132 is flush with the end of the second pole segment 2212a near the wall portion 211 in the thickness direction X of the wall portion. The structure is as follows: the isolation segment 221c extends beyond the end of the second pole segment 2212a near the wall 211 in the thickness direction X of the wall portion and is bent to form a bent portion 22132 at the end of the second pole segment 2212a near the wall portion 211. This is to bend the isolation segment 221c into an L-shaped structure. The bent portions 22132 of the multiple isolation segments 221c in the straight area 22a are located at the ends of the multiple second pole segments 2212a facing the wall portion 211. The bent portions 22132 of two adjacent isolation segments 221c are stacked together along the thickness direction X of the wall portion. That is, it can be a structure in which the bent portions 22132 of each two adjacent isolation segments 221c are stacked along the thickness direction X of the wall portion, or it can be a structure in which only the bent portions 22132 of two partially adjacent isolation segments 221c are stacked along the thickness direction X of the wall portion.

[0162] The multiple isolation sections 221c include a first isolation section 22133 and a second isolation section 22134. The distance from the end of the bent portion 22132 of the first isolation section 22133 connected to the body portion 22131 of the first isolation section 22133 to the end away from the body portion 22131 of the first isolation section 22133 in the first direction Y is greater than the distance from the end of the bent portion 22132 of the second isolation section 22134 connected to the body portion 22131 of the second isolation section 22134 to the end away from the body portion 22131 of the second isolation section 22134 in the first direction Y. That is to say, after the electrode assembly 22 is assembled into the housing 21 and the battery cell 20 is assembled, the multiple isolation sections 221c are... Among the isolation segments 221c, there are larger isolation segments 221c with bent portions 22132 in the first direction Y, and there are also smaller isolation segments 221c with bent portions 22132 in the first direction Y. Correspondingly, the isolation segment 221c with a longer distance from the end connected to the main body 22131 to the end away from the main body 22131 in the first direction Y is the first isolation segment 22133 among the multiple isolation segments 221c, while the isolation segment 221c with a shorter distance from the end connected to the main body 22131 to the end away from the main body 22131 in the first direction Y is the second isolation segment 22134 among the multiple isolation segments 221c.

[0163] Along the first direction Y, at least one pair of adjacent first isolation segments 22133 are provided with a second isolation segment 22134. That is, the plurality of isolation segments 221c includes a plurality of first isolation segments 22133 arranged along the first direction Y, and at least one pair of adjacent first isolation segments 22133 are provided with a second isolation segment 22134. This can be provided between only one pair of adjacent first isolation segments 22133, between some adjacent first isolation segments 22133, or between every pair of adjacent first isolation segments 22133.

[0164] In this embodiment, the electrolyte plays a role in conducting ions between the positive electrode 2211 and the negative electrode 2212, and the electrolyte may include electrolyte salt and solvent.

[0165] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0166] In some embodiments, the solvent may include at least one selected from ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, and methyl ethyl sulfone and diethyl sulfone. The solvent may also be an ether solvent. Ether solvents may include one or more selected from ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ethers.

[0167] In some embodiments, see Figure 3 and Figure 4 As shown, the battery cell 20 may also include an electrode terminal 23, which is insulated and mounted on the housing 21. The electrode terminal 23 is used to electrically connect with the electrode assembly 22 to output or input electrical energy of the battery cell 20.

[0168] It should be noted that the electrode terminal 23 is insulated and mounted on the housing 21, meaning that there is no electrical connection between the electrode terminal 23 and the housing 21.

[0169] For example, electrode terminals 23 are disposed on end caps 213 of housing 21.

[0170] In this embodiment of the application, the battery cell 20 includes two electrode terminals 23. The two electrode terminals 23 are disposed at a distance along the second direction Z on the end cap 213 of the housing 21. The two electrode terminals 23 are electrically connected to the positive electrode tab 222 and the negative electrode tab 223 of the electrode assembly 22, respectively, so as to realize the input or output of electrical energy of the battery cell 20.

[0171] For example, the electrode terminal 23 can be made of various materials, such as copper, iron, aluminum, steel or aluminum alloy.

[0172] For example, both the positive tab 222 and the negative tab 223 are connected to one end of the main body 221 facing the end cap 213 in the thickness direction X of the wall.

[0173] In some embodiments, see Figure 4As shown, the battery cell 20 may also include two current collectors 24. Both current collectors 24 are disposed inside the housing 21 and are spaced apart. One current collector 24 connects one electrode terminal 23 and the positive tab 222 of multiple electrode assemblies 22, and the other current collector 24 connects another electrode terminal 23 and the negative tab 223 of multiple electrode assemblies 22, so as to realize the electrical connection between the two electrode terminals 23 and the electrode assemblies 22, which helps to reduce the assembly difficulty between the electrode assemblies 22 and the electrode terminals 23.

[0174] For example, the current collector 24 is welded to the positive electrode tab 222, and similarly, the current collector 24 is welded to the negative electrode tab 223. Of course, in other embodiments, the current collector 24 and the positive electrode tab 222, as well as the current collector 24 and the negative electrode tab 223, may also have a structure such as mutual contact or snap-fit.

[0175] For example, the material of the current collector 24 can be various, such as copper, iron, aluminum, steel or aluminum alloy.

[0176] In some embodiments, see Figure 3 and Figure 4 As shown, the battery cell 20 may also include a pressure relief component 25, which is disposed on the housing 21. The pressure relief component 25 is used to release the internal pressure of the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined value.

[0177] Optionally, the pressure relief component 25 can be disposed on the end cap 213 of the outer casing 21 or on the housing 212 of the outer casing 21. Similarly, the pressure relief component 25 and the outer casing 21 can be integrally formed or separately disposed. If the pressure relief component 25 and the outer casing 21 are separately disposed, the pressure relief component 25 can be connected to the outer casing 21 by welding or other means. Correspondingly, the pressure relief component 25 can be a component such as an explosion-proof valve, explosion-proof disc, gas valve, pressure relief valve or safety valve. If the pressure relief component 25 and the outer casing 21 are integrally formed, the pressure relief component 25 is an area on the outer casing 21 with a weak structure, such as an area on the outer casing 21 with a groove.

[0178] In some embodiments, the battery cell 20 may further include an insulating member 26, which covers the outside of the main body 221 of the electrode assembly 22 to insulate and isolate the main body 221 from the outer casing 21.

[0179] The insulating element 26 is an insulating film structure covering the outside of the main body 221 of the electrode assembly 22. For example, the material of the insulating element 26 can be polyethylene or polypropylene, etc.

[0180] In some embodiments, the battery cell 20 may further include a support member 27 disposed between the wall portion 211 and the electrode assembly 22 to support the electrode assembly 22.

[0181] The support member 27 is located between the wall portion 211 and the main body portion 221 of the electrode assembly 22 and is disposed on the side of the insulating member 26 facing the main body portion 221, that is, the support member 27 is located inside the insulating member 26.

[0182] For example, the material of the support member 27 may be plastic, rubber or silicone, etc.

[0183] In this embodiment, the flat region 22a of the electrode assembly 22 has a plurality of isolation segments 221c arranged along the first direction Y. The isolation segments 221c are bent to form a body portion 22131 located between two adjacent second electrode segments 2212a and a bent portion 22132 connected to one end of the body portion 22131. The bent portion 22132 is located on the side of the second electrode segment 2212a near the wall portion 211 in the thickness direction X of the wall portion, and the bent portions 22132 of two adjacent isolation segments 221c are stacked, so that the plurality of bent portions 22132 can also serve as separators. The wall portion 211 and the pole segment 221a serve the purpose of this structure. The isolation segment 221c with this structure enhances the effect of separating adjacent pole segments 221a, reducing the risk of overlap between adjacent pole segments 221a near the wall portion 211. This is achieved by configuring multiple isolation segments 221c as first isolation segments 22133 and second isolation segments 22134 with different dimensions in the first direction Y, including a bend 22132. Furthermore, at least one pair of adjacent first isolation segments 22133 are provided with a bend 22132 in the first direction Y. 2132 A shorter second isolation segment 22134 in the first direction Y is used so that the multiple bends 22132 on the side of the multiple electrode segments 221a near the wall portion 211 have structures with different dimensions in the first direction Y. This allows the flat region 22a of the electrode assembly 22 to have an uneven structure at the end near the wall portion 211, so that the flat region 22a of the electrode assembly 22 forms a channel with a different gap size between the end near the wall portion 211 in the thickness direction X of the wall portion and the wall portion 211, so that the electrolyte can pass through the flat region 22a of the electrode assembly 22 and the wall portion 211. The channels between 11 enter the electrode assembly 22 and wet multiple electrode segments 221a, which helps to reduce the resistance encountered by the electrolyte when flowing between the electrode assembly 22 and the wall 211. As a result, the battery cell 20 with this structure can improve the wetting effect of the electrolyte entering the electrode assembly 22, thereby alleviating the phenomenon of poor electrolyte wetting effect in the electrode assembly 22 during cycle use, and reducing the risk of metal precipitation in the battery cell 20 during use, which is beneficial to improving the performance and reliability of the battery cell 20.

[0184] According to some embodiments of this application, see Figure 7 and Figure 8 As shown, along the first direction Y, at least one second isolation segment 22134 is provided between every two adjacent first isolation segments 22133. That is, the first isolation segments 22133 and the second isolation segments 22134 are staggered in the first direction Y, and there may be only one second isolation segment 22134 or multiple second isolation segments 22134 between every two adjacent first isolation segments 22133.

[0185] In this embodiment, by providing a second isolation section 22134 between each pair of adjacent first isolation sections 22133, the unevenness of the flat region 22a of the electrode assembly 22 near the wall 211 is improved, and the number of channels with different gap sizes between the flat region 22a and the wall 211 of the electrode assembly 22 is increased. This helps to reduce the difficulty of electrolyte entering the electrode assembly 22 from the end of the flat region 22a near the wall 211, and further improves the effect of electrolyte entering the electrode assembly 22 and wetting multiple electrode segments 221a.

[0186] In some embodiments, see Figure 8 As shown, along the first direction Y, a second isolation segment 22134 is provided between every two adjacent first isolation segments 22133. That is to say, the first isolation segments 22133 and the second isolation segments 22134 are arranged alternately in the first direction Y.

[0187] In this embodiment, by providing a second isolation section 22134 between each pair of adjacent first isolation sections 22133, the first isolation sections 22133 and the second isolation sections 22134 are arranged alternately in the first direction Y. This can further improve the unevenness of the flat area 22a of the electrode assembly 22 near the wall 211, and further increase the number of channels with different gap sizes between the flat area 22a and the wall 211 of the electrode assembly 22. This further reduces the difficulty for the electrolyte to enter the electrode assembly 22 from the flat area 22a near the wall 211, thereby further improving the effect of the electrolyte entering the electrode assembly 22 and wetting the multiple electrode segments 221a.

[0188] According to some embodiments of this application, see Figure 6 , Figure 7 and Figure 8 As shown, the electrode assembly 22 has a wound structure. The central axis of the winding of the electrode assembly 22 extends along the thickness direction X of the wall portion. The electrode assembly 22 includes a positive electrode 2211, a negative electrode 2212, and two separators 2213. The separators 2213 are disposed between the positive electrode 2211 and the negative electrode 2212. The positive electrode 2211 includes a first electrode segment 2211a located in the flat region 22a, and the negative electrode 2212 includes a second electrode segment 2212a located in the flat region 22a. The two separators 2213 include a first separator 2213a and a second separator 2213b, and the negative electrode 2212 is located between the first separator 2213a and the second separator 2213b. The portion of the first separator 2213a located in the flat region 22a forms multiple first separator segments 22133, and the portion of the second separator 2213b located in the flat region 22a forms multiple second separator segments 22134.

[0189] The electrode assembly 22 has a wound structure, so that the main body 221 of the electrode assembly 22 has a flat region 22a and two bent regions 22b connected to the two ends of the flat region 22a in the second direction Z. The part of the positive electrode 2211 located in the flat region 22a is the first electrode segment 2211a, and the part of the negative electrode 2212 located in the flat region 22a is the second electrode segment 2212a. Similarly, the part of the separator 2213 located in the flat region 22a is the separator segment 221c.

[0190] The two separators 2213 include a first separator 2213a and a second separator 2213b, and the negative electrode 2212 is located between the first separator 2213a and the second separator 2213b. That is, during the winding and forming process of the electrode assembly 22, the negative electrode 2212 is stacked between the first separator 2213a and the second separator 2213b, and the positive electrode 2211 is stacked on the side of the second separator 2213b away from the negative electrode 2212 and then wound together to form a structure, so that after winding and forming, the negative electrode 2212 is a structure held by the first separator 2213a and the second separator 2213b.

[0191] The portion of the first isolation member 2213a located in the flat region 22a forms multiple first isolation segments 22133, and the portion of the second isolation member 2213b located in the flat region 22a forms multiple second isolation segments 22134. That is to say, all the multiple first isolation segments 22133 are formed by the first isolation member 2213a, and all the multiple second isolation segments 22134 are formed by the second isolation member 2213b.

[0192] In this embodiment, the electrode assembly 22 has a wound structure, and the positive electrode 2211 and negative electrode 2212 of the electrode assembly 22 are stacked and wound with the two separators 2213, so that multiple electrode segments 221a and multiple separator segments 221c are formed in the flat region 22a of the electrode assembly 22 along the first direction Y. The portions of the two separators 2213 in the flat region 22a are arranged alternately along the first direction Y, thereby forming multiple first separator segments 22133 by setting the portion of the first separator 2213a in the flat region 22a. Furthermore, the portion of the second isolator 2213b located in the flat region 22a is configured to form multiple second isolators 22134, such that all multiple first isolators 22133 are formed by the first isolator 2213a, and all multiple second isolators 22134 are formed by the second isolator 2213b. This facilitates the formation of alternating first isolators 22133 and second isolators 22134 along the first direction Y, thereby reducing the difficulty of forming the first isolators 22133 and second isolators 22134 in the flat region 22a, and thus reducing the manufacturing difficulty of the electrode assembly 22.

[0193] Of course, in embodiments where the first isolation segment 22133 and the second isolation segment 22134 are alternately arranged, the structure of the electrode assembly 22 is not limited to this. In some embodiments, the electrode assembly 22 can also have other structures, for example, see [link to relevant documentation]. Figure 9 As shown, the electrode assembly 22 has a stacked structure, including multiple positive electrode plates 2211, multiple negative electrode plates 2212, and multiple separators 2213. The positive electrode plates 2211 and negative electrode plates 2212 are stacked and alternately arranged along the first direction Y. A separator 2213 is provided between each adjacent positive electrode plate 2211 and negative electrode plate 2212. The positive electrode plate 2211 is a first electrode segment 2211a, and the negative electrode plate 2212 is a second electrode segment 2212a. The multiple separators 2213 include a first separator 2213a and a second separator 2213b, which are alternately arranged along the first direction Y. The first separator 2213a is a first isolation segment 22133, and the second separator 2213b is a second isolation segment 22134.

[0194] The electrode assembly 22 has a stacked structure. Correspondingly, the positive electrode 2211 and negative electrode 2212 of the electrode assembly 22 are arranged alternately and stacked along the first direction Y. Each adjacent positive electrode 2211 and negative electrode 2212 is provided with a separator 2213. In the stacked structure of the electrode assembly 22, the main body 221 of the electrode assembly 22 only includes a flat region 22a, that is, the main body 221 of the electrode assembly 22 is a flat region 22a. The positive electrode 2211 and negative electrode 2212 of the electrode assembly 22 are multiple electrode segments 221a. That is, the entire positive electrode 2211 is the first electrode segment 2211a, and the entire negative electrode 2212 is the second electrode segment 2212a. Correspondingly, each separator 2213 is an isolation segment 221c.

[0195] In this embodiment, the electrode assembly 22 has a stacked structure, and an isolation member 2213 is provided between each adjacent positive electrode 2211 and negative electrode 2212, so that the multiple isolation members 2213 of the electrode assembly 22 are arranged at intervals along the first direction Y. By setting the multiple isolation members 2213 of the electrode assembly 22 to include a first isolation member 2213a and a second isolation member 2213b arranged alternately along the first direction Y, and the first isolation member 2213a is a first isolation segment 22133 and the second isolation member 2213b is a second isolation segment 22134, it is easier to form the first isolation segment 22133 and the second isolation segment 22134 arranged alternately along the first direction Y, thereby reducing the difficulty of forming the first isolation segment 22133 and the second isolation segment 22134 in the flat region 22a, so as to reduce the manufacturing difficulty of the electrode assembly 22.

[0196] According to some embodiments of this application, see Figure 8 As shown, the distance in the first direction Y of the bending portion 22132 of the first isolation segment 22133 from one end connected to the body portion 22131 of the first isolation segment 22133 to one end away from the body portion 22131 of the first isolation segment 22133 is 1mm-3mm larger than the distance in the first direction Y of the bending portion 22132 of the second isolation segment 22134 from one end connected to the body portion 22131 of the second isolation segment 22134 to one end away from the body portion 22131 of the second isolation segment 22134. That is, after multiple bending portions 22132 are stacked on one end of multiple second pole segments 2212a near the wall portion 211, the dimension of the bending portion 22132 of the first isolation segment 22133 in the first direction Y is 1mm-3mm larger than the dimension of the bending portion 22132 of the second isolation segment 22134 in the first direction Y.

[0197] For example, the distance from one end of the bent portion 22132 of the first isolation segment 22133 connected to the body portion 22131 of the first isolation segment 22133 to the end away from the body portion 22131 of the first isolation segment 22133 in the first direction Y may be greater than the distance from one end of the bent portion 22132 of the second isolation segment 22134 connected to the body portion 22131 of the second isolation segment 22134 to the end away from the body portion 22131 of the second isolation segment 22134 in the first direction Y by 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, or 3 mm.

[0198] In this embodiment, on the one hand, the difference between the size of the bent portion 22132 of the first isolation segment 22133 in the first direction Y and the size of the bent portion 22132 of the second isolation segment 22134 in the first direction Y is set to be greater than or equal to 1 mm. This increases the size of the gap formed after the bent portions 22132 of the first isolation segment 22133 and the bent portions 22132 of the second isolation segment 22134 are stacked together, thereby further reducing the difficulty for the electrolyte to enter the electrode assembly 22 from the end of the flat region 22a near the wall 211. This further improves the effect of the electrolyte entering the electrode assembly 22 and wetting the multiple electrode segments 221a. On the other hand, the size of the bent portion 22132 of the first isolation segment 22133 in the first direction Y is... The difference in size between the bent portion 22132 of the first isolation segment 22133 and the bent portion 22132 of the second isolation segment 22134 in the first direction Y is set to be less than or equal to 3mm. This reduces the difficulty of stacking the bent portion 22132 of the first isolation segment 22133 and the bent portion 22132 of the second isolation segment 22134, thereby reducing the manufacturing difficulty of the electrode assembly 22. It also reduces the phenomenon that the bent portion 22132 of the second isolation segment 22134 is inserted into the gap formed after the bent portions 22132 of the first isolation segment 22133 and the bent portions 22132 of the second isolation segment 22134 are stacked together, thereby reducing the phenomenon that the gap formed after the bent portions 22132 of the first isolation segment 22133 and the bent portions 22132 of the second isolation segment 22134 are stacked together is blocked or sealed.

[0199] In some embodiments, see Figure 8 As shown, the distance from one end of the bend 22132 of the first isolation segment 22133 connected to the body portion 22131 of the first isolation segment 22133 to the end of the body portion 22131 away from the first isolation segment 22133 in the first direction Y is 2mm-8mm. That is, the dimension of the bend 22132 of the first isolation segment 22133 on the side of the plurality of pole segments 221a near the wall portion 211 in the first direction Y is 2mm-8mm.

[0200] For example, the distance from one end of the bent portion 22132 of the first isolation segment 22133 connected to the body portion 22131 of the first isolation segment 22133 to one end away from the body portion 22131 of the first isolation segment 22133 in the first direction Y can be 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.8mm, 3mm, 3.2mm, 3.5mm, 3.8mm, 4mm, 4.2mm, 4.5mm, 4.8mm, 5mm, 5.2mm, 5.5mm, 5.8mm, 6mm, 6.2mm, 6.5mm, 6.8mm, 7mm, 7.2mm, 7.5mm, 7.8mm or 8mm, etc.

[0201] In this embodiment, on the one hand, the size of the bent portion 22132 of the first isolation segment 22133 in the first direction Y is set to be greater than or equal to 2mm, so as to reduce the forming difficulty of the bent portion 22132 of the first isolation segment 22133 and reduce the stacking difficulty of the bent portion 22132 of the first isolation segment 22133 and the bent portion 22132 of the second isolation segment 22134. On the other hand, the size of the bent portion 22132 of the first isolation segment 22133 in the first direction Y is set to be less than or equal to 8mm, which can reduce the phenomenon of excessive waste of the bent portion 22132 of the first isolation segment 22133, which is beneficial to optimize the volume and weight of the electrode assembly 22 and can reduce the redundancy of the bent portion 22132 of the first isolation segment 22133.

[0202] In some embodiments, please continue to see Figure 8 As shown, the distance from one end of the bend 22132 of the second isolation segment 22134 connected to the body portion 22131 of the second isolation segment 22134 to the end of the body portion 22131 away from the second isolation segment 22134 in the first direction Y is 1mm-5mm. That is, the dimension of the bend 22132 of the second isolation segment 22134 on the side of the plurality of pole segments 221a near the wall portion 211 in the first direction Y is 1mm-5mm.

[0203] For example, the distance from one end of the bent portion 22132 of the second isolation segment 22134 connected to the body portion 22131 of the second isolation segment 22134 to one end away from the body portion 22131 of the second isolation segment 22134 in the first direction Y can be 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.8mm, 2mm, 2.2mm, 2.5mm, 2.8mm, 3mm, 3.2mm, 3.5mm, 3.8mm, 4mm, 4.2mm, 4.5mm, 4.8mm or 5mm, etc.

[0204] In this embodiment, on the one hand, the size of the bent portion 22132 of the second isolation segment 22134 in the first direction Y is set to be greater than or equal to 1 mm, so as to reduce the forming difficulty of the bent portion 22132 of the second isolation segment 22134 and reduce the stacking difficulty of the bent portion 22132 of the second isolation segment 22134 and the bent portion 22132 of the first isolation segment 22133. On the other hand, the size of the bent portion 22132 of the second isolation segment 22134 in the first direction Y is set to be less than or equal to 5 mm, which can reduce the phenomenon of excessive waste of the bent portion 22132 of the second isolation segment 22134, which is beneficial to optimize the volume and weight of the electrode assembly 22, and can reduce the redundancy of the bent portion 22132 of the second isolation segment 22134.

[0205] According to some embodiments of this application, refer to Figure 8 Please refer to further details. Figure 10 , Figure 10 This is a partial cross-sectional view of an electrode assembly 22 (before the isolation section 221c is bent) provided in some embodiments of this application. At least one through hole 22135 is provided on the bent portion 22132, and the through hole 22135 penetrates the bent portion 22132 along its thickness direction. It should be noted that the bent portions 22132 of two adjacent isolation sections 221c are stacked along the thickness direction X of the wall on the side of multiple electrode segments 221a near the wall 211, such that the thickness direction of the bent portion 22132 is parallel to the thickness direction X of the wall. Correspondingly, the through hole 22135 also penetrates the bent portion 22132 along the thickness direction X of the wall.

[0206] In this embodiment, by providing a through hole 22135 on the bend 22132 of the isolation section 221c, and the through hole 22135 having a structure that penetrates the bend 22132 along the thickness direction of the bend 22132, the electrolyte can also enter the electrode assembly 22 through the through hole 22135. This further reduces the difficulty for the electrolyte to enter the electrode assembly 22 from the end of the flat region 22a near the wall 211, thereby improving the effect of the electrolyte entering the electrode assembly 22 and wetting the multiple electrode segments 221a.

[0207] In some embodiments, see Figure 10 As shown, the bent portion 22132 is provided with multiple through holes 22135.

[0208] In this embodiment, by providing multiple through holes 22135 on the bent portion 22132, the electrolyte can enter the electrode assembly 22 through the multiple through holes 22135. This helps to further increase the path of the electrolyte from the end of the flat region 22a near the wall portion 211 into the electrode assembly 22, thereby further improving the effect of the electrolyte entering the electrode assembly 22 and wetting the multiple electrode segments 221a.

[0209] In some embodiments, combined with Figure 8 and Figure 10As shown, at least one through hole 22135 on the bend portion 22132 of at least one first isolation segment 22133 communicates with at least one through hole 22135 on the bend portion 22132 of at least one second isolation segment 22134. That is, in the bend portions 22132 of the stacked and adjacent first isolation segment 22133 and second isolation segment 22134, at least one through hole 22135 on the bend portion 22132 of the first isolation segment 22133 and at least one through hole 22135 on the bend portion 22132 of the second isolation segment 22134 are correspondingly provided in the thickness direction X of the wall portion.

[0210] In this embodiment, the through holes 22135 on the bends 22132 of the first isolation section 22133 and the bends 22132 of the second isolation section 22134 are interconnected, thereby improving the smoothness of the electrolyte entering the electrode assembly 22 through the through holes 22135 of the multiple bends 22132. This reduces the resistance encountered by the electrolyte when it enters the electrode assembly 22 from the end of the flat region 22a near the wall 211, which is beneficial to further improve the effect of the electrolyte entering the electrode assembly 22 and wetting the multiple electrode segments 221a.

[0211] In some embodiments, the diameter of the through hole 22135 is 0.2mm-1mm.

[0212] For example, the diameter of the through hole 22135 on the bent portion 22132 can be 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.72mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm or 1mm, etc.

[0213] In this embodiment, on the one hand, setting the aperture of the through hole 22135 on the bending portion 22132 to be greater than or equal to 0.2 mm can reduce the difficulty of setting the through hole 22135 on the bending portion 22132, and facilitate the electrolyte to enter the electrode assembly 22 through the through hole 22135, which is beneficial to improve the smoothness of the electrolyte entering the electrode assembly 22 through the through hole 22135. On the other hand, setting the aperture of the through hole 22135 on the bending portion 22132 to be less than or equal to 1 mm can reduce the phenomenon of excessive waste of the through hole 22135 size, and can alleviate the phenomenon that the multiple overlapping bending portions 22132 have poor separation effect on the wall portion 211 and the electrode segment 221a due to the excessive size of the through hole 22135.

[0214] According to some embodiments of this application, see Figure 4 and Figure 5As shown, along the direction of gravity, the wall portion 211 is located at the bottom of the electrode assembly 22, and the wall portion 211 is configured to support the electrode assembly 22. That is, the thickness direction X of the wall portion is the direction of gravity or approximately the direction of gravity. Correspondingly, the wall portion 211 is located below the electrode assembly 22 and the electrode assembly 22 is placed on the wall portion 211, so that the wall portion 211 can support the electrode assembly 22.

[0215] In this embodiment, the wall 211 is a wall of the outer shell 21 located at the bottom of the electrode assembly 22 in the direction of gravity and supporting the electrode assembly 22. This allows the bent portions 22132 of the multiple isolation sections 221c to be stacked at the bottom of the electrode assembly 22. With this structure, the battery cell 20 can form an uneven structure at the bottom of the flat area 22a of the electrode assembly 22 through the multiple bent portions 22132 of different lengths and stacked arrangement. This allows the flat area 22a of the electrode assembly 22 to form channels with different gap sizes at the end that is pressed by its own weight. This reduces the difficulty for the electrolyte to enter the electrode assembly 22 from the end that is pressed by the flat area 22a, thereby improving the effect of the electrolyte wetting the entire electrode assembly 22.

[0216] According to some embodiments of this application, please continue to refer to Figure 4 and Figure 5 As shown, the battery cell 20 may also include an insulating member 26, which covers the outside of the electrode assembly 22, and a portion of the insulating member 26 is located between the wall portion 211 and the bends 22132 of the plurality of isolation sections 221c.

[0217] For example, the insulating member 26 is an insulating film covering the outside of the main body portion 221 of the electrode assembly 22.

[0218] The insulating member 26 is located between the wall portion 211 and the bends 22132 of the plurality of isolation segments 221c. In other words, the bends 22132 of the plurality of isolation segments 221c are a structure that is stacked between the plurality of pole segments 221a and the insulating member 26 in the thickness direction X of the wall portion.

[0219] In this embodiment, by covering the outside of the electrode assembly 22 with an insulating member 26, the insulating member 26 can serve to insulate and isolate the electrode assembly 22 and the housing 21, which helps to reduce the risk of short circuit between the electrode assembly 22 and the housing 21.

[0220] According to some embodiments of this application, refer to Figure 4 and Figure 5 Please refer to further details. Figure 11 , Figure 11This is a schematic diagram of the structure of the support member 27 of the battery cell 20 provided in some embodiments of this application. The battery cell 20 may further include the support member 27, which is disposed between the electrode assembly 22 and the wall portion 211 in the thickness direction X of the wall portion and abuts against the electrode assembly 22. The support member 27 is provided with at least one groove 272, and along the thickness direction X of the wall portion, the support member 27 has a first surface 271 facing the electrode assembly 22, and the groove 272 penetrates the first surface 271 and forms a first opening 2711.

[0221] The support member 27 is disposed between the main body 221 and the wall 211 of the electrode assembly 22 in the thickness direction X of the wall portion, so as to separate the wall portion 211 and the main body 221 of the electrode assembly 22. Correspondingly, in the embodiment where the wall portion 211 is located at the bottom of the electrode assembly 22 along the gravity direction, the support member 27 also serves to support the electrode assembly 22, that is, the electrode assembly 22 is placed on the support member 27.

[0222] For example, the support member 27 can be made of various materials, such as plastic, rubber or silicone.

[0223] The support member 27 has a first surface 271 facing the electrode assembly 22, and a groove 272 penetrates the first surface 271 to form a first opening 2711. That is, the groove 272 provided on the support member 27 is a structure that extends to the first surface 271 on the side of the support member 27 facing the electrode assembly 22, so that the area of ​​the first surface 271 penetrated by the groove 272 forms the first opening 2711. Optionally, the shape of the groove 272 can be various, such as strip, circle, triangle or ring, etc. Similarly, the number of grooves 272 can be one or more.

[0224] For example, in Figure 11 In the support member 27, a plurality of grooves 272 are provided. The grooves 272 are strip-shaped and extend along the first direction Y. Correspondingly, the grooves 272 penetrate the outer peripheral surface 274 of the support member 27 in the first direction Y and form a second opening 2743. The grooves 272 also penetrate the second surface 273 of the support member 27 away from the electrode assembly 22 and form a third opening 2731. In other words, the grooves 272 are structures that penetrate the entire support member 27 along the thickness direction X of the wall, and the grooves 272 penetrate at least one end of the support member 27 in the first direction Y.

[0225] In this embodiment, a support member 27 is provided between the wall portion 211 and the electrode assembly 22, so that the support member 27 can play a supporting and separating role between the electrode assembly 22 and the wall portion 211, which helps to reduce the risk of overlap and collision between the electrode assembly 22 and the wall portion 211. In particular, by providing a groove 272 on the support member 27, and the groove 272 penetrates the first surface 271 of the support member 27 facing the electrode assembly 22 and forms a first opening 2711, the groove 272 can play a role in buffering electrolyte, and the electrolyte contained in the groove 272 can enter the electrode assembly 22 through the gap channel between multiple bends 22132, which helps to reduce the difficulty of the end of the electrode assembly 22 near the wall portion 211 being wetted by electrolyte, thereby improving the wetting effect of electrolyte on the electrode assembly 22.

[0226] According to some embodiments of this application, in conjunction with Figure 4 and Figure 5 As shown, the battery cell 20 may further include an insulating member 26, which covers the outside of the electrode assembly 22, and the insulating member 26 includes an insulating portion 261 located between the wall portion 211 and the electrode assembly 22. Along the thickness direction X of the wall portion, a support member 27 is located between the insulating portion 261 and the electrode assembly 22.

[0227] Among them, the insulating portion 261 of the insulating member 26 is the part of the insulating member 26 located between the wall portion 211 and the main body portion 221 of the electrode assembly 22 in the thickness direction X of the wall portion. Correspondingly, along the thickness direction X of the wall portion, the support member 27 is located between the insulating portion 261 and the electrode assembly 22. That is, the support member 27 is located on the side of the insulating portion 261 of the insulating member 26 facing the main body portion 221 of the electrode assembly 22 in the thickness direction X of the wall portion, so that the support member 27 is also located inside the insulating member 26.

[0228] In this embodiment, by covering the outside of the electrode assembly 22 with an insulating member 26, the insulating member 26 can effectively insulate and isolate the electrode assembly 22 and the outer casing 21, thus mitigating the risk of short circuit between the electrode assembly 22 and the outer casing 21. Furthermore, by configuring the support member 27 between the electrode assembly 22 and the insulating portion 261 of the insulating member 26, the support member 27 is positioned inside the insulating member 26. This structure in the battery cell 20 allows the support member 27 to act as a separator between the insulating member 26 and the electrode assembly 22, thereby mitigating the insulation... When part 261 is pressed or pressed against the electrode assembly 22, the resistance encountered by the electrolyte when entering the electrode assembly 22 from the end near the wall 211 is too great. On the other hand, it facilitates direct contact between the multiple bends 22132 and the support member 27, so that the electrolyte contained in the groove 272 can enter the electrode assembly 22 through the gap channel between the multiple bends 22132. This helps to further reduce the difficulty of the end of the electrode assembly 22 near the wall 211 being wetted by the electrolyte, thereby further improving the wetting effect of the electrolyte on the electrode assembly 22.

[0229] In some embodiments, see Figure 4 As shown, the support member 27 and the insulating part 261 are separate components. That is, the support member 27 and the insulating part 261 of the insulating member 26 are two independent parts. Correspondingly, the support member 27 and the insulating part 261 can be fixedly connected, such as by bonding, or they can not be fixedly connected and are only in contact with each other.

[0230] In this embodiment, by setting the support member 27 and the insulating portion 261 of the insulating member 26 as separate structures, it is beneficial to reduce the difficulty of setting the support member 27 between the insulating portion 261 and the electrode assembly 22, thereby reducing the assembly difficulty of the battery cell 20, and also reducing the difficulty of setting the groove 272 on the first surface 271 of the support member 27, thereby reducing the molding difficulty of the support member 27.

[0231] Of course, the structure of the battery cell 20 is not limited to this. In some embodiments, the battery cell 20 can also have other structures, such as the support member 27 and the insulating part 261 being integrally formed. That is, the support member 27 and the insulating part 261 are structures formed by an integral forming process, such as extrusion molding or injection molding. Correspondingly, the support member 27 is a protruding structure that protrudes from the insulating part 261 on the side facing the main body 221 of the electrode assembly 22.

[0232] In this embodiment, by setting the insulating portion 261 of the support member 27 and the insulating member 26 as an integrally formed structure, it is beneficial to improve the overall structural stability between the support member 27 and the insulating member 26, so as to improve the supporting effect of the support member 27 on the electrode assembly 22, and reduce the risk of the support member 27 shifting or displacing between the insulating portion 261 and the electrode assembly 22 during use.

[0233] According to some embodiments of this application, in conjunction with Figure 5 , Figure 8 and Figure 11 As shown, along the thickness direction X of the wall portion, at least a portion of at least one bend 22132 is correspondingly disposed with respect to the first opening 2711 of at least one groove 272. That is, at least a portion of the projection of the bend 22132 of at least one isolation segment 221c onto the thickness direction X of the wall portion is located within a groove 272, i.e., the bend 22132 of at least one isolation segment 221c covers at least a portion of the first opening 2711 of at least one groove 272 along the thickness direction X of the wall portion.

[0234] In this embodiment, by setting at least a portion of at least one of the multiple bends 22132 in the wall thickness direction X to correspond to the first opening 2711 of at least one groove 272, the difficulty of the electrolyte contained in the groove 272 entering the gap channel between the multiple bends 22132 is reduced. This facilitates the electrolyte contained in the groove 272 to directly enter the electrode assembly 22 through the gap channel between the multiple bends 22132, which is beneficial to further improve the wetting effect of the electrolyte on the electrode assembly 22.

[0235] According to some embodiments of this application, in conjunction with Figure 5 , Figure 8 and Figure 11 As shown, along the thickness direction X of the wall portion, at least a portion of the bent portion 22132 of at least one first isolation segment 22133 is located within at least one groove 272. That is, at least a portion of the bent portion 22132 of at least one first isolation segment 22133 is inserted into at least one groove 272 along the thickness direction X of the wall portion.

[0236] In this embodiment, by setting at least a portion of the bend 22132 of the longer first isolation segment 22133 in the first direction Y as a structure located within the groove 272, at least one first isolation segment 22133 can come into contact with the electrolyte contained in the groove 272. This facilitates the electrolyte contained in the groove 272 to climb through the first isolation segment 22133 into the gap channel between the multiple bends 22132 before entering the electrode assembly 22, which is beneficial to further improve the wetting effect of the electrolyte on the electrode assembly 22.

[0237] According to some embodiments of this application, refer to Figure 4 and Figure 11 Please refer to further details. Figure 12 , Figure 12 This is a front view of the support member 27 of the battery cell 20 provided in some embodiments of this application in the thickness direction X of the wall portion. The groove 272 extends along the first direction Y, that is, the groove 272 is a strip-shaped groove structure extending along the first direction Y.

[0238] In this embodiment, by setting the groove 272 to extend along the first direction Y, the extension direction of the groove 272 is parallel to the stacking direction of the multiple electrode segments 221a, which facilitates the electrolyte contained in the groove 272 to wet the multiple electrode segments 221a, thereby improving the overall wetting effect of the electrode assembly 22 and enhancing the performance and reliability of the battery cell 20.

[0239] In some embodiments, combined with Figure 5 , Figure 8 and Figure 11 As shown, at least one groove 272 spans at least two adjacent pole segments 221a along the first direction Y. That is, the projections of two or more adjacent pole segments 221a in the thickness direction X of the wall are located within the same groove 272. Correspondingly, the extension dimension of one or more grooves 272 in the first direction Y is greater than the thickness of the stacked and adjacent pole segments 221a.

[0240] In this embodiment, by setting at least one groove 272 to span at least two adjacent electrode segments 221a along the first direction Y, the at least one groove 272 is configured to correspond to at least two electrode segments 221a in the thickness direction X of the wall, thereby facilitating the wetting of multiple electrode segments 221a by the electrolyte contained in the groove 272, which is beneficial to further improve the overall wetting effect of the electrode assembly 22.

[0241] In some embodiments, see Figure 11 and Figure 12 As shown, the first surface 271 is provided with a plurality of grooves 272, at least some of the grooves 272 are arranged at intervals along the second direction Z, and the thickness direction X of the wall, the first direction Y and the second direction Z are perpendicular to each other.

[0242] Among them, at least some of the grooves 272 are arranged at intervals along the second direction Z. That is to say, at least some of the grooves 272 are arranged at intervals along the second direction Z. It can be that all of the grooves 272 are arranged at intervals along the second direction Z, or it can be that only some of the grooves 272 are arranged at intervals along the second direction Z.

[0243] For example, in Figure 12 In the first surface 271, multiple rows of grooves 272 are arranged at intervals along the second direction Z, and each row of grooves 272 includes multiple grooves 272 arranged at intervals along the first direction Y.

[0244] In this embodiment, by providing a plurality of grooves 272 arranged at intervals along the second direction Z on the first surface 271 of the support member 27, so that the plurality of bent portions 22132 are provided with grooves 272 at multiple positions in the second direction Z, the electrolyte can enter the electrode assembly 22 from different positions through the gap channels between the plurality of bent portions 22132, which is beneficial to further improve the wetting effect of the electrolyte on the electrode assembly 22.

[0245] In some embodiments, please continue to see Figure 11 and Figure 12 As shown, the first surface 271 is provided with a plurality of grooves 272, and at least some of the grooves 272 are arranged at intervals along the first direction Y.

[0246] Among them, at least some of the grooves 272 are arranged at intervals along the first direction Y. That is to say, at least some of the grooves 272 are arranged at intervals along the first direction Y. It can be that all of the grooves 272 are arranged at intervals along the first direction Y, or it can be that only some of the grooves 272 are arranged at intervals along the first direction Y.

[0247] For example, in Figure 12 In the first surface 271, multiple rows of grooves 272 are arranged at intervals along the second direction Z, and each row of grooves 272 includes two grooves 272 arranged at intervals along the first direction Y. The grooves 272 have a structure that extends along the first direction Y. Of course, in other embodiments, each row of grooves 272 may also include three, four or five grooves 272 arranged at intervals along the first direction Y.

[0248] In this embodiment, by providing a plurality of grooves 272 extending along the first direction Y and arranged at intervals on the first surface 271 of the support member 27, the plurality of grooves 272 on the support member 27 can be correspondingly provided with more electrode segments 221a in the thickness direction X of the wall, thereby facilitating the electrolyte contained in the grooves 272 to wet the plurality of electrode segments 221a, which is beneficial to further improve the overall wetting effect of the electrode assembly 22.

[0249] According to some embodiments of this application, see Figure 11 and Figure 12As shown, the support member 27 also has a second surface 273 facing away from the electrode assembly 22 in the thickness direction X of the wall portion, and the support member 27 also includes an outer peripheral surface 274, which connects the first surface 271 and the second surface 273. At least one end of at least one groove 272 in the first direction Y passes through the outer peripheral surface 274 and forms a second opening 2743.

[0250] The second surface 273 is the surface of the support member 27 facing the wall portion 211 in the thickness direction X of the wall portion. Correspondingly, the outer peripheral surface 274 is the side surface that extends circumferentially along the support member 27 and connects the first surface 271 and the second surface 273.

[0251] At least one groove 272 extends through at least one end of the outer peripheral surface 274 in the first direction Y and forms a second opening 2743. That is, at least one groove 272 is a structure that extends along the first direction Y and at least one end extends to the outer peripheral surface 274, so that the area of ​​the outer peripheral surface 274 penetrated by the groove 272 forms the second opening 2743. For example, in Figure 12 In this embodiment, only one end of the groove 272 in the first direction Y penetrates the outer peripheral surface 274. Of course, in other embodiments, the groove 272 may also have a structure in which both ends in the first direction Y penetrate the outer peripheral surface 274.

[0252] In this embodiment, by setting the groove 272 to penetrate the outer peripheral surface 274 of the support member 27 at least one end in the first direction Y, the electrolyte can enter the groove 272 from the area of ​​the outer peripheral surface 274 of the support member 27 penetrated by the groove 272, thereby reducing the difficulty of the electrolyte entering the groove 272 and improving the smoothness of the electrolyte entering the groove 272, thereby further improving the wetting effect of the electrolyte on the end of the electrode assembly 22 near the wall 211.

[0253] According to some embodiments of this application, see Figure 11 and Figure 12 As shown, the support member 27 may include a plurality of support portions 275 and at least one connecting portion 276. The plurality of support portions 275 are arranged at intervals along the second direction Z, and each pair of adjacent support portions 275 are connected by the connecting portion 276. The thickness direction X, the first direction Y, and the second direction Z of the wall are perpendicular to each other. Along the second direction Z, at least one groove 272 is formed between each pair of adjacent support portions 275.

[0254] Along the second direction Z, at least one groove 272 is formed between every two adjacent support portions 275. That is, there may be only one groove 272 or multiple grooves 272 formed between two adjacent support portions 275. For example, in Figure 11In this embodiment, each pair of adjacent support portions 275 is connected by a connecting portion 276, and the two ends of the connecting portion 276 are respectively connected to the middle of the two adjacent support portions 275, so that two grooves 272 located on both sides of the corresponding connecting portion 276 in the first direction Y are formed between the two adjacent support portions 275. Of course, in other embodiments, the connecting portion 276 may also have its two ends connected to the ends of the two adjacent support portions 275, so that only one groove 272 is formed between the two adjacent support portions 275. Similarly, multiple connections arranged at intervals along the first direction Y may also be connected between the two adjacent support portions 275, so that multiple grooves 272 arranged at intervals along the first direction Y are formed between the two adjacent support portions 275.

[0255] For example, the connecting portion 276 is a structure that extends along the second direction Z.

[0256] In this embodiment, the support member 27 is provided with a plurality of support portions 275 arranged at intervals along the second direction Z, and each pair of adjacent support portions 275 are connected by a connecting portion 276, so that at least one groove 272 can be formed between the two adjacent support portions 275. The support member 27 with this structure is convenient to form the groove 272 on the support member 27, which is simple in structure and easy to manufacture. On the other hand, it allows the electrolyte to enter the groove 272 from at least one end of the support member 27 in the first direction Y, and then enter the interior of the electrode assembly 22 through the gap channel between the plurality of bends 22132 to wet the plurality of electrode segments 221a. This helps to increase the path of the electrolyte into the electrode assembly 22, thereby further reducing the difficulty of the electrolyte wetting the end of the electrode assembly 22 near the wall portion 211, so as to further improve the overall wetting effect of the electrode assembly 22.

[0257] In some embodiments, see Figure 12 As shown, the two ends of the connecting portion 276 are respectively connected to the middle of two adjacent support portions 275, and two grooves 272 are formed between the two adjacent support portions 275. The two grooves 272 are respectively located on both sides of the connecting portion 276 in the first direction Y. Correspondingly, the grooves 272 located on both sides of the same connecting portion 276 in the first direction Y have a structure in which one end of the support member 27 in the first direction Y passes through one side of the support member 27 in the first direction Y.

[0258] It should be noted that the grooves 272 on both sides of the same connecting portion 276 in the first direction Y can have the same or different dimensions in the first direction Y. For example, in Figure 12 In the middle, the grooves 272 on both sides of the same connecting part 276 in the first direction Y have different dimensions in the first direction Y.

[0259] In this embodiment, by connecting the two ends of the connecting portion 276 to the middle positions of two adjacent support portions 275, two grooves 272 are formed between the two adjacent support portions 275 at intervals along the first direction Y. This allows the electrolyte to enter the corresponding grooves 272 from the two ends of the support member 27 in the first direction Y, and then enter the interior of the electrode assembly 22 through the gap channel between the multiple bends 22132 to wet the multiple electrode segments 221a. This further increases the path for the electrolyte to enter the electrode assembly 22.

[0260] According to some embodiments of this application, see Figure 11 and Figure 12 As shown, along the first direction Y, the outer peripheral surface 274 includes a first side surface 2741 and a second side surface 2742 disposed opposite to each other, and the distance between at least one connecting portion 276 and the first side surface 2741 and the distance between it and the second side surface 2742 are not equal.

[0261] The support member 27 has a rectangular structure in the orthographic projection of the wall portion in the thickness direction X. Correspondingly, the support member 27 has two oppositely arranged sides in the first direction Y, namely the first side 2741 and the second side 2742.

[0262] At least one connecting portion 276 has a distance between itself and the first side surface 2741 that is not equal to the distance between itself and the second side surface 2742. That is, in the same connecting portion 276, the distance between the connecting portion 276 and the first side surface 2741 in the first direction Y is not equal to the distance between the connecting portion 276 and the second side surface 2742 in the first direction Y.

[0263] For example, in Figure 12 In the support member 27, there are multiple connecting portions 276. The multiple connecting portions 276 include a first connecting portion 2761 and a second connecting portion 2762 that are adjacent to each other in the second direction Z. The first connecting portion 2761 and the second connecting portion 2762 are arranged at intervals in the first direction Y. Correspondingly, the distance between the first connecting portion 2761 and the first side surface 2741 in the first direction Y is greater than the distance between the first connecting portion 2761 and the second side surface 2742 in the first direction Y. Conversely, the distance between the second connecting portion 2762 and the first side surface 2741 in the first direction Y is less than the distance between the second connecting portion 2762 and the second side surface 2742 in the first direction Y.

[0264] In this embodiment, by setting the distance between at least one connecting portion 276 and the first side surface 2741 and the distance between it and the second side surface 2742 to be unequal, the at least one connecting portion 276 is set at a position offset from the middle position of the support member 27 in the first direction Y, so that the groove 272 can extend to the middle position of the support member 27 in the first direction Y, thereby facilitating the supply of electrolyte to the middle position of the electrode assembly 22 in the first direction Y within the battery cell 20, which is beneficial to improving the effect of the electrode assembly 22 being wetted by the electrolyte.

[0265] According to some embodiments of this application, see Figure 12 As shown, the support member 27 may include a plurality of connecting portions 276, each of which includes at least one first connecting portion 2761 and at least one second connecting portion 2762. Along the first direction Y, the outer peripheral surface 274 includes a first side surface 2741 and a second side surface 2742 disposed opposite to each other, and the distance between each first connecting portion 2761 and the first side surface 2741 and the distance between each second connecting portion 2762 and the first side surface 2741 are not equal.

[0266] Wherein, along the first direction Y, the distance between each first connecting part 2761 and the first side surface 2741 is greater than the distance between each second connecting part 2762 and the first side surface 2741. Conversely, along the first direction Y, the distance between each first connecting part 2761 and the second side surface 2742 is less than the distance between each second connecting part 2762 and the second side surface 2742. That is to say, in the first direction Y, the first connecting part 2761 is closer to the first side surface 2741 than the second connecting part 2762, and the first connecting part 2761 is farther away from the second side surface 2742 than the second connecting part 2762.

[0267] In this embodiment, by setting the distance between each first connecting part 2761 and the first side surface 2741 and the distance between each second connecting part 2762 and the first side surface 2741 to be unequal, the first connecting parts 2761 and the second connecting parts 2762 are arranged in a staggered manner in the second direction Z. This can disperse the pressure of the electrode assembly 22 on the support member 27, which helps to reduce the stress concentration phenomenon in the support member 27 and improve the structural strength of the support member 27, thereby reducing the risk of breakage or deformation of the support member 27 during use.

[0268] In some embodiments, see Figure 12 As shown, the support member 27 has a central axis (not shown) that is parallel to the second direction Z. At least one first connecting portion 2761 is located on one side of the central axis in the first direction Y, and at least one second connecting portion 2762 is located on the other side of the central axis in the first direction Y.

[0269] The central axis of the support member 27 is a straight line extending along the second direction Z, and the orthographic projection of the support member 27 in the thickness direction X perpendicular to the wall portion is a structure that is symmetrical about the central axis of the support member 27.

[0270] At least one first connecting portion 2761 is located on one side of the central axis in the first direction Y, and at least one second connecting portion 2762 is located on the other side of the central axis in the first direction Y. That is, at least one first connecting portion 2761 and at least one second connecting portion 2762 are respectively located on both sides of the central axis in the first direction Y. For example, all first connecting portions 2761 are located on one side of the central axis in the first direction Y, and all second connecting portions 2762 are located on the other side of the central axis in the first direction Y. In the first direction Y, the distance between the first connecting portion 2761 and the central axis is equal to the distance between the second connecting portion 2762 and the central axis.

[0271] In this embodiment, by setting the first connecting part 2761 and the second connecting part 2762 to be located on both sides of the central axis of the support member 27 in the first direction Y, the opposite sides of the support member 27 along the first direction Y have good structural strength, which can better disperse the pressure of the electrode assembly 22 on the support member 27, thereby reducing the stress concentration phenomenon of the support member 27 during use and reducing the risk of deformation of the support member 27, thereby improving the reliability of the support member 27.

[0272] In some embodiments, please continue to see Figure 12 As shown, there are multiple first connecting parts 2761 and second connecting parts 2762, and the first connecting parts 2761 and second connecting parts 2762 are alternately arranged along the second direction Z.

[0273] In this embodiment, by setting the first connecting part 2761 and the second connecting part 2762 to be arranged alternately along the second direction Z, each pair of adjacent connecting parts 276 in the plurality of connecting parts 276 are staggered in the second direction Z, thereby effectively improving the structural strength of the support member 27, which is beneficial to reducing the stress concentration phenomenon of the support member 27 during use, and can reduce the deformation risk of the support member 27.

[0274] In some embodiments, see Figure 12 As shown, there are multiple first connecting parts 2761, which are arranged along the second direction Z and all located on the same straight line. That is, the multiple first connecting parts 2761 are arranged along a straight line trajectory parallel to the second direction Z. Correspondingly, in the projection plane perpendicular to the second direction Z, the orthographic projections of the multiple first connecting parts 2761 coincide.

[0275] In this embodiment, by setting the multiple first connecting parts 2761 to be arranged along the second direction Z and all located on the same straight line, the arrangement of the multiple first connecting parts 2761 is regular, which helps to reduce the processing difficulty of the support member 27 and can better disperse the pressure of the electrode assembly 22 on the support member 27, so as to reduce the stress concentration phenomenon of the support member 27 during use and reduce the risk of deformation of the support member 27.

[0276] In some embodiments, please continue to see Figure 12 As shown, there are multiple second connecting portions 2762, which are arranged along the second direction Z and all located on the same straight line. That is, the multiple second connecting portions 2762 are arranged along a straight line trajectory parallel to the second direction Z. Correspondingly, in the projection plane perpendicular to the second direction Z, the orthographic projections of the multiple second connecting portions 2762 coincide.

[0277] In this embodiment, by setting the multiple second connecting parts 2762 to be arranged along the second direction Z and all located on the same straight line, the arrangement of the multiple second connecting parts 2762 is regular, which helps to reduce the processing difficulty of the support member 27 and can better disperse the pressure of the electrode assembly 22 on the support member 27, so as to reduce the stress concentration phenomenon of the support member 27 during use and reduce the risk of deformation of the support member 27.

[0278] According to some embodiments of this application, see Figure 11 As shown, along the thickness direction X of the wall portion, the support member 27 also has a second surface 273 facing away from the electrode assembly 22, and at least one groove 272 penetrates the second surface 273 to form a third opening 2731. That is, the groove 272 provided on the support member 27 is a structure that extends to the second surface 273 on the side of the support member 27 facing away from the electrode assembly 22, so that the area of ​​the second surface 273 penetrated by the groove 272 forms the third opening 2731. Correspondingly, the groove 272 is a structure that penetrates the entire support member 27 along the thickness direction X of the wall portion.

[0279] It should be noted that in the embodiment where the groove 272 penetrates the second surface 273 along the thickness direction X of the wall, the groove 272 can only be a structure in the first direction Y that penetrates the outer peripheral surface 274 of the support member 27 at one end. If the groove 272 is a structure that does not penetrate the second surface 273 in the thickness direction X of the wall, then the groove 272 can be a structure in the first direction Y that penetrates the outer peripheral surface 274 of the support member 27 at both ends.

[0280] In this embodiment, by configuring at least one groove 272 to penetrate the second surface 273 of the support member 27 away from the electrode assembly 22, the at least one groove 272 is configured to penetrate the entire support member 27 along the thickness direction X of the wall. On the one hand, this can improve the ability of the groove 272 to buffer electrolyte, thereby increasing the electrolyte storage capacity of the groove 272. On the other hand, it facilitates the entry of electrolyte from the side of the support member 27 away from the electrode assembly 22 into the groove 272, and then through the gap channel between the multiple bends 22132 into the interior of the electrode assembly 22 to wet the multiple electrode segments 221a. This helps to reduce the difficulty of electrolyte entering the groove 272, thereby further reducing the difficulty of electrolyte wetting the end of the electrode assembly 22 near the wall 211, and thus further improving the overall wetting effect of the electrode assembly 22.

[0281] According to some embodiments of this application, see Figure 11 and Figure 12 As shown, the support member 27 is provided with a positioning hole 277, which penetrates the support member 27 along the thickness direction X of the wall, and the positioning hole 277 and the groove 272 are not connected.

[0282] The positioning hole 277 and the groove 272 are not connected. That is to say, in the projection plane perpendicular to the thickness direction X of the wall, the orthographic projection of the hole wall of the positioning hole 277 and the orthographic projection of the groove side of the groove 272 do not overlap.

[0283] It should be noted that the positioning hole 277 plays a positioning role for the support member 27 during the assembly or processing of the support member 27. The positioning hole 277 has a structure in which the two ends of the wall thickness direction X pass through the first surface 271 and the second surface 273 of the support member 27 respectively, and the positioning hole 277 does not pass through the outer peripheral surface 274 of the support member 27.

[0284] For example, the support member 27 is provided with two positioning holes 277, which are arranged at intervals along the second direction Z, and one of the positioning holes 277 is a round hole and the other positioning hole 277 is an oblong hole.

[0285] In this embodiment, the support member 27 is also provided with a positioning hole 277, which can be used to position the support member 27. On the one hand, it can improve the assembly accuracy of the support member 27 into the outer shell 21, thereby improving the assembly quality of the battery cell 20. On the other hand, it can improve the accuracy of machining the groove 272 on the support member 27, thereby improving the production quality of the support member 27. In particular, by setting the positioning hole 277 and the groove 272 to be non-communicating, the interference effect of the groove 272 on the positioning hole 277 during use can be reduced, and the phenomenon of reduced structural strength of the support member 27 can be reduced.

[0286] According to some embodiments of this application, this application also provides a battery device 100, which includes a battery cell 20 of any of the above schemes.

[0287] Among them, see Figure 2 As shown, the battery device 100 may also include a housing 10, in which the battery cells 20 are housed.

[0288] In some embodiments, the housing 10 may include a first housing body 11 and a second housing body 12, the first housing body 11 and the second housing body 12 covering each other, the first housing body 11 and the second housing body 12 together defining an assembly space for accommodating the battery cell 20.

[0289] Optionally, the second box body 12 can be a hollow structure with one end open, and the first box body 11 can be a plate-like structure. The first box body 11 covers the open side of the second box body 12 so that the first box body 11 and the second box body 12 together define the assembly space; the first box body 11 and the second box body 12 can also be hollow structures with one side open, and the open side of the first box body 11 covers the open side of the second box body 12.

[0290] Of course, the box 10 formed by the first box body 11 and the second box body 12 can be of various shapes, such as a cylinder or a cuboid. For example, in... Figure 2 In the middle, box 10 has a rectangular structure.

[0291] Optionally, the battery cell 20 disposed within the housing 10 can be one or more. For example, in... Figure 2 In the battery device 100, multiple battery cells 20 are arranged inside the housing 10. The multiple battery cells 20 can be connected in series, parallel, or in a mixed manner. A mixed connection means that the multiple battery cells 20 are connected in both series and parallel. The multiple battery cells 20 can be directly connected in series, parallel, or in a mixed manner, and then the whole assembly of the multiple battery cells 20 is housed in the housing 10. Of course, the battery device 100 can also be formed by first connecting multiple battery cells 20 in series, parallel, or in a mixed manner to form a battery module, and then connecting multiple battery modules in series, parallel, or in a mixed manner to form a whole assembly, which is also housed in the housing 10.

[0292] The battery device 100 may also include other structures. For example, the battery device 100 may also include a busbar component that connects multiple battery cells 20 to achieve electrical connection between the multiple battery cells 20.

[0293] It should be noted that in some embodiments, the battery device 100 may not have a housing 10. The battery device 100 includes multiple battery cells 20, and the battery device 100 composed of multiple battery cells 20 can be directly mounted onto the electrical device to provide power to the electrical device through the multiple battery cells 20. That is, the housing 10 can be part of the electrical device. Taking a vehicle 1000 as an example, the housing 10 can be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 10 can be at least a part of the floor of the vehicle 1000, or a portion of the housing 10 can be at least a part of the crossbeams and longitudinal beams of the vehicle 1000.

[0294] According to some embodiments of this application, this application also provides an electrical device, which includes a battery cell 20 of any of the above schemes, and the battery cell 20 is used to provide electrical energy to the electrical device.

[0295] The electrical device can be any of the aforementioned devices or systems that utilize battery cells 20.

[0296] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0297] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell, characterized in that, include: The outer shell has walls; Electrolyte, contained within the outer casing; as well as At least one electrode assembly is disposed within the housing. The electrode assembly has a flat region, which includes multiple electrode segments and multiple isolation segments. The multiple electrode segments are stacked along a first direction, and an isolation segment is disposed between each pair of adjacent electrode segments. The plurality of pole segments include alternating first pole segments and second pole segments arranged along the first direction, the first pole segments and the second pole segments having opposite polarities, and the end of the first pole segment near the wall portion in the thickness direction of the wall portion not exceeding the second pole segment. The isolation segment is bent to form an interconnected body portion and a bent portion, the body portion being located between two adjacent second pole segments, the bent portion being located on the side of the second pole segment near the wall portion, and the bent portions of two adjacent isolation segments being stacked. The plurality of isolation segments include a first isolation segment and a second isolation segment, the distance of the bent portion of the first isolation segment from one end connected to the body portion of the first isolation segment to one end away from the body portion of the first isolation segment in the first direction is greater than the distance of the bent portion of the second isolation segment from one end connected to the body portion of the second isolation segment to one end away from the body portion of the second isolation segment in the first direction, and a second isolation segment is arranged between at least one set of two adjacent first isolation segments along the first direction, the first direction being perpendicular to the thickness direction of the wall portion.

2. The battery cell according to claim 1, characterized in that, Along the first direction, at least one second isolation segment is provided between every two adjacent first isolation segments.

3. The battery cell according to claim 2, characterized in that, Along the first direction, a second isolation segment is provided between every two adjacent first isolation segments.

4. The battery cell according to claim 3, characterized in that, The electrode assembly has a wound structure, and the winding center axis of the electrode assembly extends along the thickness direction of the wall portion. The electrode assembly includes a positive electrode plate, a negative electrode plate, and two separators. The separators are disposed between the positive electrode plate and the negative electrode plate. The positive electrode plate includes a first electrode segment located in the flat region, and the negative electrode plate includes a second electrode segment located in the flat region. The two isolation components include a first isolation component and a second isolation component, and the negative electrode is located between the first isolation component and the second isolation component. The portion of the first isolation component located in the flat region forms a plurality of first isolation segments, and the portion of the second isolation component located in the flat region forms a plurality of second isolation segments.

5. The battery cell according to claim 3, characterized in that, The electrode assembly has a stacked structure, comprising multiple positive electrode plates, multiple negative electrode plates, and multiple separators. The positive electrode plates and the negative electrode plates are stacked and alternately arranged along the first direction. A separator is provided between each adjacent positive electrode plate and negative electrode plate. The positive electrode plate is the first electrode segment, and the negative electrode plate is the second electrode segment. The plurality of isolation elements include a first isolation element and a second isolation element, the first isolation element and the second isolation element are alternately arranged along the first direction, the first isolation element is the first isolation segment, and the second isolation element is the second isolation segment.

6. The battery cell according to claim 1, characterized in that, The difference between the distance in the first direction of the bent portion of the first isolation segment from one end connected to the body portion of the first isolation segment to one end away from the body portion of the first isolation segment and the distance in the first direction of the bent portion of the second isolation segment from one end connected to the body portion of the second isolation segment to one end away from the body portion of the second isolation segment is 1mm-3mm.

7. The battery cell according to claim 1, characterized in that, The distance from one end of the bent portion of the first isolation segment connected to the body portion of the first isolation segment to one end away from the body portion of the first isolation segment in the first direction is 2mm-8mm; and / or The distance from one end of the body portion connected to the second isolation section to one end of the body portion away from the second isolation section in the first direction is 1mm-5mm.

8. The battery cell according to claim 1, characterized in that, The bent portion is provided with at least one through hole, which penetrates the bent portion along the thickness direction.

9. The battery cell according to claim 8, characterized in that, At least one through hole on the bend of at least one first isolation segment communicates with at least one through hole on the bend of at least one second isolation segment.

10. The battery cell according to claim 8, characterized in that, The diameter of the through hole is 0.2mm-1mm.

11. The battery cell according to claim 1, characterized in that, Along the direction of gravity, the wall portion is located at the bottom of the electrode assembly, and the wall portion is configured to support the electrode assembly.

12. The battery cell according to any one of claims 1-11, characterized in that, The battery cell also includes: A support member is disposed between the electrode assembly and the wall portion in the thickness direction of the wall portion and abuts against the electrode assembly. The support member is provided with at least one groove, and along the thickness direction of the wall portion, the support member has a first surface facing the electrode assembly, and the groove penetrates the first surface and forms a first opening.

13. The battery cell according to claim 12, characterized in that, The battery cell further includes an insulating component, which covers the outside of the electrode assembly, and the insulating component includes an insulating portion located between the wall portion and the electrode assembly; Along the thickness direction of the wall portion, the support member is located between the insulating portion and the electrode assembly.

14. The battery cell according to claim 13, characterized in that, The support member and the insulating part are integrally arranged; or The support member and the insulation part are integrally formed.

15. The battery cell according to claim 12, characterized in that, Along the thickness direction of the wall portion, at least a portion of at least one of the bent portions is disposed corresponding to the first opening of at least one of the grooves.

16. The battery cell according to claim 15, characterized in that, Along the thickness direction of the wall portion, at least a portion of the bend of at least one of the first isolation sections is located within at least one of the grooves.

17. The battery cell according to claim 12, characterized in that, The groove extends along the first direction.

18. The battery cell according to claim 17, characterized in that, The first surface is provided with a plurality of said grooves, at least some of said grooves being spaced apart along the first direction; and / or The first surface is provided with a plurality of grooves, at least some of which are arranged at intervals along the second direction, and the thickness direction of the wall portion is perpendicular to the first direction and the second direction.

19. The battery cell according to claim 17, characterized in that, The support member also has a second surface facing away from the electrode assembly in the thickness direction of the wall portion, and the support member further includes an outer peripheral surface that connects the first surface and the second surface, and at least one end of the groove in the first direction penetrates the outer peripheral surface to form a second opening.

20. The battery cell according to claim 19, characterized in that, The support member includes a plurality of support portions and at least one connecting portion. The plurality of support portions are arranged at intervals along the second direction, and each pair of adjacent support portions are connected by the connecting portion. The thickness direction of the wall portion, the first direction, and the second direction are perpendicular to each other. Along the second direction, at least one groove is formed between every two adjacent support portions.

21. The battery cell according to claim 20, characterized in that, The two ends of the connecting part are respectively connected to the middle of two adjacent supporting parts, and two grooves are formed between the two adjacent supporting parts. The two grooves are respectively located on both sides of the connecting part in the first direction.

22. The battery cell according to claim 21, characterized in that, Along the first direction, the outer peripheral surface includes a first side and a second side disposed opposite to each other, and the distance between at least one of the connecting portions and the first side and the distance between the connecting portion and the second side are not equal.

23. The battery cell according to claim 20, characterized in that, The support member includes a plurality of the connecting portions, and the plurality of the connecting portions includes at least one first connecting portion and at least one second connecting portion; Along the first direction, the outer peripheral surface includes a first side surface and a second side surface disposed opposite to each other, and the distance between each first connecting portion and the first side surface and the distance between each second connecting portion and the first side surface are not equal.

24. The battery cell according to claim 23, characterized in that, The support member has a central axis, which is parallel to the second direction; At least one of the first connecting portions is located on one side of the central axis in the first direction, and at least one of the second connecting portions is located on the other side of the central axis in the first direction.

25. The battery cell according to claim 23, characterized in that, There are multiple first connecting parts and multiple second connecting parts, and the first connecting parts and the second connecting parts are alternately arranged along the second direction.

26. The battery cell according to claim 23, characterized in that, There are multiple first connecting portions, which are arranged along the second direction and all located on the same straight line; and / or There are multiple second connecting parts, and the multiple second connecting parts are arranged along the second direction and are all located on the same straight line.

27. The battery cell according to claim 12, characterized in that, Along the thickness direction of the wall portion, the support member also has a second surface facing away from the electrode assembly, and at least one of the grooves penetrates the second surface and forms a third opening.

28. The battery cell according to claim 12, characterized in that, The support member is provided with a positioning hole, which penetrates the support member along the thickness direction of the wall portion, and the positioning hole and the groove are not connected.

29. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1-28.

30. An electrical device, characterized in that, Includes a battery cell as described in any one of claims 1-28, the battery cell being used to provide electrical energy.

Images