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, a support and an electrode assembly. The electrode assembly comprises a plurality of pole piece segments arranged in a stack along a first direction, and an isolation segment is arranged between each adjacent two pole piece segments. The isolation segment is bent to form a body part and a bent part. The body part is located between the adjacent two pole piece segments, and the bent part is located on a side of the pole piece segment close to a wall part. The support is configured to support the electrode assembly and is provided with a first groove. The first groove has a first opening facing the bent part. At least one bent part penetrates the first opening of at least one first groove and extends into the first groove, so as to increase the contact area between the bent part and the electrolyte in the first groove, thereby facilitating the electrolyte to pass through the bent part and climb to the inside of the electrode assembly for infiltration under the action of capillary phenomenon and the gap between the bent parts arranged in a stack.

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, a support member, 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 two adjacent electrode segments, the isolation segment is bent to form an interconnected body portion and a bent portion, the body portion is located between two adjacent electrode segments, the bent portion is located on the side of the electrode segment near the wall portion, and the bent portions of two adjacent isolation segments are stacked, the thickness direction of the wall portion is perpendicular to the first direction; the support member is disposed between the electrode assembly and the wall portion in the thickness direction of the wall portion, and the support member is configured to support the electrode assembly, the support member has at least one first groove, the first groove having a first opening facing the bent portion along the thickness direction of the wall portion, and at least one bent portion passing through the first opening of at least one first groove and extending into the first groove.

[0006] In the above technical solution, the flat area 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 electrode segments and a bent portion connected to one end of the body portion. The bent portion is located on the side of the electrode segment closest 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. Correspondingly, a support member is also provided between the electrode assembly and the wall portion, enabling the support member to provide support and separation between the electrode assembly and the wall portion, further reducing the risk of overlap and impact between the electrode assembly and the wall portion. Specifically, a first groove is provided on the support member, and the first groove has a direction facing the bent portion in the thickness direction of the wall portion. The first opening, and at least one bend passing through the first opening of at least one first groove and extending into the first groove, increases the contact area and effect between the bend and the electrolyte after the electrolyte enters the first groove. This facilitates the electrolyte passing through the bend and, under capillary action, climbing through the bend and the gaps between the stacked bends to the interior of the electrode assembly and wet multiple electrode segments. This reduces the difficulty of the electrolyte entering the electrode assembly from the end near the wall and improves the smoothness of the electrolyte entering the electrode assembly. As a result, the battery cell with this structure can improve the effect of the electrolyte entering the electrode assembly and wetting multiple electrode segments, thus alleviating the phenomenon of poor electrolyte wetting effect during the cycle of the electrode assembly 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 thickness direction of the wall portion, a plurality of the bent portions pass through the first opening of the same first groove and extend into the first groove.

[0008] In the above technical solution, by setting the multiple stacked bends to pass through the first opening of the same first groove and extend into the first groove, the same first groove can accommodate at least a portion of the multiple bends, thereby facilitating the simultaneous contact of the electrolyte in the first groove with the multiple bends. This is beneficial to further improve the efficiency of the electrolyte climbing into the electrode assembly through the bends, and thus further improve the wetting effect of the electrolyte on the electrode assembly.

[0009] In some embodiments, the support member is provided with a plurality of first grooves, and along the thickness direction of the wall portion, at least one of the bent portions passes through the first opening of the plurality of first grooves and extends into the plurality of first grooves.

[0010] In the above technical solution, by setting multiple first grooves on the support member, and at least one bending part is a structure inserted into multiple first grooves, the contact area between the bending part and the electrolyte in the first groove is increased, and multiple positions in different areas of the bending part are in contact with the electrolyte in the first groove. This increases the path and efficiency of the electrolyte climbing up the bending part into the electrode assembly, thereby further improving the wetting effect of the electrolyte on the electrode assembly.

[0011] In some embodiments, the first groove extends along the first direction, and the support member is provided with multiple rows of first grooves spaced apart along the second direction, and each row of first grooves includes at least one first groove. The thickness direction of the wall portion, the first direction, and the second direction are perpendicular to each other. Along the thickness direction of the wall portion, the bent portion is disposed opposite to the multiple first grooves, and the multiple regions of the bent portion in the second direction pass through the first opening of the corresponding first groove and extend into the corresponding first groove.

[0012] In the above technical solution, by setting multiple rows of first grooves spaced apart along the second direction on the support member, and inserting multiple areas of the bent portion in the second direction into the corresponding first grooves, the bent portion can contact the electrolyte in the first groove at multiple positions in the second direction. This facilitates manufacturing and assembly, reduces the assembly difficulty between the electrode assembly and the support member, and enables the electrolyte to climb from multiple positions of the bent portion into the electrode assembly in the second direction. This increases the path and efficiency of the electrolyte climbing into the electrode assembly through the bent portion, thereby further improving the wetting effect of the electrolyte on the electrode assembly.

[0013] In some embodiments, along the thickness direction of the wall portion, the bent portion is bent to form an arc-shaped area corresponding to the area of ​​the first opening, and the arc-shaped area passes through the first opening of the corresponding first groove and extends into the first groove.

[0014] In the above technical solution, by setting the area of ​​the bent portion corresponding to the first opening as a curved area and inserting it into the first groove, the part of the bent portion that passes through the first opening and extends into the first groove is the area of ​​the curved structure formed after the bent portion is bent. This structure facilitates the insertion of the curved area into the first groove along the thickness direction of the wall, which helps to reduce the difficulty of making the bent portion pass through the first opening of the first groove and extend into the first groove. On the other hand, it can further increase the contact area between the part of the bent portion located in the first groove and the electrolyte, which helps to further improve the efficiency of the electrolyte climbing into the electrode assembly through the bent portion, thereby further improving the wetting effect of the electrolyte on the electrode assembly.

[0015] In some embodiments, a plurality of the bent portions are stacked in the arc-shaped regions corresponding to the same first opening in the thickness direction of the wall portion and extend into the corresponding first groove; along the thickness direction of the wall portion, in two adjacent arc-shaped regions, the maximum curvature of the arc-shaped region closer to the wall portion is greater than the maximum curvature of the arc-shaped region farther from the wall portion.

[0016] In the above technical solution, the arc-shaped areas of multiple bends at the same first opening are stacked, and the maximum curvature of the arc-shaped areas closer to the wall is relatively larger. This makes at least a portion of the arc-shaped areas closer to the wall of the multiple bends have a greater degree of curvature. The battery cell with this structure can increase the gap between the arc-shaped areas of two adjacent bends, which is beneficial to further increase the size of the channel through which the electrolyte passes between two adjacent bends. This can further improve the smoothness of the electrolyte entering the electrode assembly from the end of the electrode assembly near the wall, and further improve the effect of the electrolyte entering the electrode assembly to wet multiple electrode segments.

[0017] In some embodiments, a gap channel is formed between two adjacent bends along the thickness direction of the wall portion; a communication port is formed at one end of the gap channel away from the body portion, and at least a portion of the communication port is located in the first groove and communicates with the first groove.

[0018] In the above technical solution, by setting the connecting port at the end of the gap channel away from the main body to be at least partially located in and connected to the first groove, the gap channel between two adjacent bends can be connected to the first groove at the end of the bend away from the main body. This facilitates the electrolyte in the first groove to enter the gap channel between the two adjacent bends from the connecting port and then climb to the interior of the electrode assembly. This further improves the smoothness of the electrolyte entering the electrode assembly from the end of the electrode assembly near the wall, thereby further improving the wetting effect of the electrolyte on the electrode assembly.

[0019] In some embodiments, the maximum dimension of the region of the gap channel corresponding to the first opening in the thickness direction of the wall portion gradually increases from one end of the bend portion connected to the body portion to the end of the bend portion away from the body portion.

[0020] In the above technical solution, by setting the maximum dimension of the area corresponding to the first opening of the gap channel in the thickness direction of the wall portion to gradually increase from the end of the bending portion connected to the main body portion to the end of the bending portion away from the main body portion, the dimension of the gap channel corresponding to the connection port in the thickness direction of the wall portion is maximized. This facilitates the electrolyte in the first groove to enter the gap channel through the connection port, which helps to further reduce the difficulty of the electrolyte entering the gap channel. In turn, it can further improve the smoothness of the electrolyte entering the electrode assembly from the end of the electrode assembly near the wall portion, thereby further improving the wetting effect of the electrolyte on the electrode assembly.

[0021] In some embodiments, along the thickness direction of the wall portion, in two adjacent gap channels, the maximum dimension of the portion of the communication opening of the gap channel closer to the wall portion located within the first groove in the thickness direction of the wall portion is greater than the maximum dimension of the portion of the communication opening of the gap channel farther from the wall portion located within the first groove in the thickness direction of the wall portion.

[0022] In the above technical solution, by setting the maximum dimension of the portion of the gap channel near the wall located in the first groove in the thickness direction of the wall to be greater than the maximum dimension of the portion of the gap channel far from the wall located in the first groove in the thickness direction of the wall, the maximum dimension of the gap channel near the wall corresponding to the first opening in the thickness direction of the wall is larger among the multiple gap channels formed by multiple bends. This facilitates the entry of electrolyte in the first groove into different gap channels, further reducing the difficulty of electrolyte entering between the multiple bends stacked, and further improving the smoothness of electrolyte entering the electrode assembly from the end of the electrode assembly near the wall, thereby further improving the wetting effect of electrolyte on the electrode assembly.

[0023] In some embodiments, the plurality of pole segments include a first pole segment and a second pole segment alternately arranged along the first direction, the first pole segment and the second pole segment having opposite polarities, and the end of the first pole segment near the wall portion in the thickness direction of the wall portion not extending beyond the second pole segment; 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 portion in the thickness direction of the wall portion.

[0024] In the above technical solution, the end of the second pole segment near the wall is flush with or longer than the end of the first pole segment near the wall. By setting the body part between two adjacent second pole segments and setting the bending part on the side of the second pole segment near the wall in the thickness direction of the wall, it is easier to bend the isolation segment, thereby reducing the molding difficulty of the body part and the bending part, and further improving the effect of the isolation segment in separating two adjacent pole segments, so as to further reduce the risk of overlapping of two adjacent pole segments near the wall.

[0025] In some embodiments, a second groove is provided on the surface of at least one side of the isolation segment, the second groove including a first groove segment located on the bend, the first groove segment communicating with at least one of the first grooves.

[0026] In the above technical solution, by providing a second groove on at least one side of the surface of the isolation section, the second groove includes a first groove segment located on the bend, and the first groove segment located on the bend communicates with at least one first groove, so that at least a portion of the second groove is provided on the bend and communicates with at least one first groove on the support member, and the first groove can form a channel for electrolyte passage between two overlapping bends, thereby facilitating the electrolyte to enter the first groove segment of the bend through the first groove of the support member and then climb to the interior of the electrode assembly to wet multiple electrode segments. This helps to further reduce the difficulty of electrolyte entering the electrode assembly from the end near the wall of the electrode assembly, and further improves the smoothness of electrolyte entering the interior of the electrode assembly. As a result, the battery cell with this structure can further improve the effect of electrolyte entering the electrode assembly to wet multiple electrode segments, thereby further alleviating the phenomenon of poor electrolyte wetting effect during the cycle use of the electrode assembly, and further reducing the risk of metal precipitation during the use of the battery cell, which is conducive to further improving the performance and reliability of the battery cell.

[0027] In some embodiments, along the thickness direction of the wall portion, the surface of the bent portion facing the support member is provided with the first groove segment, and the first groove segment is provided corresponding to the first opening of at least one first groove.

[0028] In the above technical solution, by providing a first groove segment on the surface of the bent portion facing the support member, and the first groove segment being configured to correspond with the first opening of at least one first groove, the first groove segment on the bent portion is configured to face the first opening of at least one first groove, thereby facilitating the interconnection between the first groove segment and at least one first groove, and increasing the interconnection area between the first groove segment and the first groove, thereby improving the smoothness of the electrolyte entering the first groove segment from the first groove.

[0029] In some embodiments, along the thickness direction of the wall portion, the surface of the bent portion opposite to the support member is provided with the first groove segment; the first groove segment penetrates the end face of the bent portion away from the body portion and forms a second opening, and at least a portion of the second opening is located in the first groove and communicates with the first groove.

[0030] In the above technical solution, by providing a first groove segment on the surface of the bent portion away from the support member, and the first groove segment penetrating the end face of the bent portion away from the main body and forming a second opening, at least a portion of which is located in the first groove, the first groove segment is configured to be interconnected with at least one first groove through the second opening, and the electrolyte in the first groove can easily enter the first groove segment from the second opening, which helps to reduce the difficulty of the electrolyte in the first groove entering the first groove segment.

[0031] In some embodiments, along the thickness direction of the wall portion, at least one region of the bent portion having the first groove segment passes through the first opening of at least one first groove and extends into the first groove.

[0032] In the above technical solution, by setting the area of ​​the bending part with the first groove segment as a structure that passes through the first opening of at least one first groove and is inserted into the first groove, on the one hand, it is convenient for the first groove and the first groove segment to communicate with each other, so as to further improve the smoothness of the electrolyte in the first groove entering the first groove segment. On the other hand, it is beneficial to make the area of ​​the bending part with the first groove segment bend or irregular in shape, which is conducive to expanding the size of the channel formed between the two overlapping bending parts for the electrolyte to pass through, so as to further reduce the difficulty of the electrolyte entering the electrode assembly from the end of the electrode assembly near the wall.

[0033] In some embodiments, along the thickness direction of the wall portion, at least one of the bent portions is bent to form an arc-shaped area corresponding to the region of the first opening, at least a portion of the arc-shaped area is located within the first groove, and at least a portion of at least one of the first groove segments is disposed in the arc-shaped area.

[0034] In the above technical solution, by setting the bending portion to bend into an arc-shaped area in the region of the first opening of the corresponding support member, the arc-shaped area is inserted into the first groove, and at least a portion of the first groove segment is disposed in the arc-shaped area, so that the region of the bending portion with the first groove segment is a bent structure inserted into the first groove, thereby further facilitating the communication between the first groove and the first groove segment, thereby further improving the smoothness of the electrolyte entering the first groove segment, and further expanding the size of the channel formed between the two overlapping bending portions for the electrolyte to pass through, thereby further reducing the difficulty of the electrolyte entering the electrode assembly from the end of the electrode assembly near the wall.

[0035] In some embodiments, the first groove segment extends along the extending direction of the bend.

[0036] In the above technical solution, by setting the first tank segment as a structure extending along the extension direction of the bending portion, the first tank segment is a strip-shaped structure extending from one end of the bending portion connected to the main body to the other end of the bending portion away from the main body. The first tank segment with this structure facilitates the electrolyte to climb towards the main body after entering the first tank segment, thereby facilitating the electrolyte to climb into the interior of the electrode assembly to wet multiple electrode segments, which is beneficial to further improve the effect of the electrode assembly being wetted by the electrolyte.

[0037] In some embodiments, the first groove extends to the end of the bend away from the body portion.

[0038] In the above technical solution, by setting the first tank segment to extend to the end of the bend that is away from the main body, the first tank segment is a structure that penetrates the end face of the bend that is away from the main body. This facilitates the entry of electrolyte from the area of ​​the bend that is penetrated by the first tank segment into the first tank segment, which helps to reduce the difficulty of electrolyte entering the first tank segment and improves the smoothness of electrolyte entering the first tank segment.

[0039] In some embodiments, the first groove extends along the first direction, and the support member is provided with multiple rows of first grooves spaced apart along the second direction, and each row of first grooves includes at least one first groove. The thickness direction of the wall portion, the first direction, and the second direction are perpendicular to each other. In a projection plane perpendicular to the thickness direction of the wall portion, the orthographic projection of the groove wall surface of the first groove segment extends along the first direction, and at least a portion of the orthographic projection of the groove wall surface of the first groove segment is located within the orthographic projection of the groove wall surface of a row of first grooves.

[0040] In the above technical solution, by setting the orthographic projection of the first tank segment's wall surface in the projection plane perpendicular to the thickness direction of the wall portion as a structure extending along the first direction, and at least a portion of the orthographic projection of the first tank segment's wall surface in the projection plane perpendicular to the thickness direction of the wall portion is located within the orthographic projection of the wall surface of a column of first grooves in the projection plane perpendicular to the thickness direction of the wall portion, the length direction of the first tank segment is consistent with the length direction of the first groove, and the first tank segment is correspondingly arranged with the first groove in the same column in the first direction, thereby further facilitating the entry of electrolyte into the first tank segment after the first groove and the first tank segment are connected, which is beneficial to further reduce the difficulty of electrolyte entering the first tank segment and further improve the smoothness of electrolyte entering the first tank segment.

[0041] In some embodiments, the second groove further includes a second groove segment located on the body portion, and the second groove segment communicates with the first groove segment.

[0042] In the above technical solution, the second groove also includes a second groove segment located on the body, and the second groove segment and the first groove segment are interconnected, so that the second groove is partially disposed on the bent part and the other part is disposed on the body. The electrode assembly with this structure is convenient for the electrolyte in the first groove segment to enter the second groove segment and then climb to the interior of the electrode assembly and wet multiple electrode segments, which is beneficial to further improve the effect of the electrode assembly being wetted by the electrolyte.

[0043] In some embodiments, the second groove segment extends along the thickness direction of the wall portion.

[0044] In the above technical solution, by setting the second tank section as a structure that extends along the thickness direction of the wall, the electrolyte in the first tank section can climb along the thickness direction of the wall after entering the second tank section. This helps to reduce the difficulty of the electrolyte climbing along the thickness direction of the wall, thereby facilitating the electrolyte to climb into the interior of the electrode assembly and wet multiple electrode segments, which is beneficial to further improve the effect of the electrode assembly being wetted by the electrolyte.

[0045] In some embodiments, the second groove extends to one end of the body portion away from the bend.

[0046] In the above technical solution, by setting the second groove segment to extend to the end of the main body away from the bending part, the second groove segment is a structure that penetrates the end face of the main body away from the wall part, which facilitates the processing of the second groove from the end of the main body away from the bending part, and helps to reduce the difficulty of setting the second groove on the isolation section.

[0047] In some embodiments, a plurality of second grooves are provided on the surface of at least one side of the isolation segment, and the plurality of second grooves are spaced apart along a second direction, wherein the thickness direction of the wall portion, the first direction, and the second direction are perpendicular to each other.

[0048] In the above technical solution, by providing a plurality of second grooves arranged at intervals along the second direction on the surface of at least one side of the isolation section, a plurality of first groove segments arranged at intervals along the second direction are provided on the bending part. This can, on the one hand, further increase the number and space of channels for electrolyte to pass through between the two overlapping bending parts, and on the other hand, enable the electrolyte to enter the multiple bending parts from the first groove segments at different positions of the bending part and then enter the electrode assembly, which is beneficial to increase the path for electrolyte flow and further improve the wetting effect of electrolyte on the electrode assembly.

[0049] In some embodiments, the isolation segment includes a base film and a coating, wherein the base film has the coating disposed on at least one side in its thickness direction, the coating having a porous structure, and the second groove is disposed on the coating.

[0050] In the above technical solution, the isolation section includes a base film and a coating disposed on the base film. By disposing the second groove on the coating of the isolation section, it is beneficial to reduce the difficulty of forming the second groove on the isolation section and to alleviate the phenomenon that the structural strength of the isolation section is excessively weakened by the second groove.

[0051] In some embodiments, the depth of the second groove is less than the thickness of the coating.

[0052] In the above technical solution, by setting the groove depth of the second groove to be less than the thickness of the coating, the second groove is a structure that does not penetrate the entire coating in the thickness direction of the coating. This allows the coating to be provided between the bottom surface of the base film and the second groove, thereby enabling the coating to play a certain role in separating and protecting the base film, reducing the risk of the base film being punctured in the area corresponding to the second groove, and thus mitigating the risk of internal short circuits in the electrode assembly caused by the puncture of the base film.

[0053] In some embodiments, the second groove extends through the coating along its thickness direction.

[0054] In the above technical solution, by setting the second groove as a structure that penetrates the coating in the thickness direction of the coating, on the one hand, the difficulty of setting the second groove on the coating can be reduced, and the second groove can be formed on the coating by simply using an intermittent coating process. On the other hand, the depth of the second groove can be further increased, so as to further increase the space between the two overlapping bends for the electrolyte to pass through and store the electrolyte.

[0055] In some embodiments, the first groove extends along the first direction.

[0056] In the above technical solution, by setting the first groove as a structure extending along the first direction, the extension direction of the first groove is parallel to the stacking direction of the multiple electrode segments, which facilitates the electrolyte contained in the first groove to wet the multiple electrode segments, which is beneficial to improving the overall wetting effect of the electrode assembly, thereby improving the performance and reliability of the battery cell.

[0057] In some embodiments, the extension length of the first groove in the first direction is greater than the maximum dimension of the bent portion in the first direction.

[0058] In the above technical solution, by setting the length of the first groove in the first direction to be greater than the maximum size of the bending part in the first direction, the phenomenon of the bending part covering the first groove is reduced. This facilitates the bending part to pass through the first opening of the first groove and extend into the first groove, reducing the difficulty of inserting the bending part into the first groove. On the other hand, it can improve the contact effect between the bending part and the electrolyte in the first groove, and reduce the obstruction of the first groove by a single bending part. This allows the electrolyte to climb into the interior of the electrode assembly through the bending part and the gaps between the stacked bending parts and wet multiple electrode segments, which helps to improve the smoothness of the electrolyte entering the interior of the electrode assembly, thereby improving the wetting effect of the electrolyte on the electrode assembly.

[0059] In some embodiments, the support member is provided with multiple rows of first grooves arranged at intervals along the second direction, and each row of first grooves includes at least one first groove, wherein the thickness direction of the wall portion, the first direction, and the second direction are perpendicular to each other.

[0060] In the above technical solution, by providing multiple rows of first grooves arranged at intervals along the second direction on the support member, and each row of first grooves including at least one first groove extending along the first direction, the multiple first grooves on the support member can be arranged to correspond to more electrode segments in the thickness direction of the wall, thereby facilitating the electrolyte contained in the first groove to wet multiple electrode segments, which is beneficial to further improve the overall wetting effect of the electrode assembly.

[0061] In some embodiments, the support member has a first surface facing the electrode assembly and a second surface facing away from the electrode assembly in the thickness direction of the wall portion, the first groove penetrating the first surface and forming the first opening; the support member also has an outer peripheral surface connecting the first surface and the second surface, at least one end of the first groove in the first direction penetrating the outer peripheral surface and forming a third opening.

[0062] In the above technical solution, by setting at least one first groove to penetrate the outer peripheral surface of the support member at least one end in the first direction, the electrolyte can also enter the first groove from the third opening, thereby reducing the difficulty of the electrolyte entering the first groove and improving the smoothness of the electrolyte entering the first groove, thereby further improving the wetting effect of the electrolyte on the end of the electrode assembly near the wall.

[0063] 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 first groove is formed between each pair of adjacent support portions.

[0064] 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 first groove can be formed between the two adjacent support portions. The support member with this structure is convenient to form the first groove on the support member, the structure is simple and easy to manufacture. On the other hand, it allows the electrolyte to enter the first groove from at least one end of the support member in the first direction and then climb up to the electrode assembly through the first groove segment on the bend and 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 wetting the end of the electrode assembly near the wall, so as to further improve the overall wetting effect of the electrode assembly.

[0065] In some embodiments, the two ends of the connecting portion are respectively connected to the middle of two adjacent support portions, and two first grooves are formed between the two adjacent support portions, with the two first grooves located on both sides of the connecting portion in the first direction.

[0066] In the above technical solution, by connecting the two ends of the connecting part to the middle position of two adjacent support parts, two first grooves are formed between the two adjacent support parts and spaced apart along the first direction. This allows the electrolyte to enter the corresponding first groove from the two ends of the support in the first direction and then climb up to the electrode assembly through the first groove segment on the bending part and wet multiple electrode segments, which helps to further increase the path of the electrolyte into the electrode assembly.

[0067] 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.

[0068] 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 first 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, which is beneficial to improving the effect of the electrode assembly being wetted by the electrolyte.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] In some embodiments, the support member has a first surface facing the electrode assembly and a second surface facing away from the electrode assembly in the thickness direction of the wall portion, the first groove penetrating the first surface and forming the first opening; and at least one of the first grooves penetrating the second surface in the thickness direction of the wall portion and forming a fourth opening.

[0076] In the above technical solution, by setting at least one first groove to also penetrate the second surface of the support member away from the electrode assembly, the at least one first 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 electrolyte buffering capacity of the first groove, thereby increasing the electrolyte storage capacity of the first groove. On the other hand, it facilitates the electrolyte to enter the first groove from the side of the support member away from the electrode assembly and then climb up to the electrode assembly through the first groove segment on the bend and wet multiple electrode segments. This helps to reduce the difficulty of electrolyte entering the first 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.

[0077] In some embodiments, the electrode assembly directly abuts against the support member along the thickness direction of the wall portion.

[0078] In the above technical solution, by setting the electrode assembly and the support to a direct contact structure, the difficulty of connecting the first groove on the support and the first groove segment on the bend can be reduced, and the electrolyte contained in the first groove can directly enter the first groove segment and then climb to the interior of the electrode assembly. This is beneficial to further reduce the difficulty of the end of the electrode assembly near the wall being wetted by the electrolyte, so as to further improve the wetting effect of the electrolyte on the electrode assembly.

[0079] 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.

[0080] 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, which helps reduce the risk of short circuit between the electrode assembly and the outer shell. Specifically, by setting the support component as a structure between the insulating part of the electrode assembly and the insulating component, the support component is located inside the insulating component. With this structure, the battery cell allows the support component to act as a separator between the insulating component and the electrode assembly, which alleviates the difficulty of electrolyte entering multiple electrode segments through multiple bends after the insulating part is pressed or squeezed against the electrode assembly. On the other hand, it facilitates direct contact between the bends and the support component, so that the electrolyte contained in the first groove can directly enter the first groove segment and then climb into the interior of the electrode assembly. This further reduces the difficulty of the end of the electrode assembly near the wall being wetted by the electrolyte, thereby further improving the wetting effect of the electrolyte on the electrode assembly.

[0081] In some embodiments, the support member and the insulating portion are separately disposed; or, the support member and the insulating portion are integrally formed.

[0082] 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. It also reduces the difficulty of setting the first groove on the side of the support facing the electrode assembly, thus 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. Furthermore, it reduces the risk of the support shifting or displacing between the insulating part and the electrode assembly during use.

[0083] Secondly, embodiments of this application also provide a battery device, including the aforementioned battery cell.

[0084] 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

[0085] 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.

[0086] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0087] Figure 2 Exploded views of the structure of the battery device provided in some embodiments of this application;

[0088] Figure 3 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0089] Figure 4 Exploded views of the structure of a single battery cell provided in some embodiments of this application;

[0090] Figure 5 Cross-sectional views of a battery cell provided in some embodiments of this application;

[0091] 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;

[0092] 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;

[0093] Figure 8 for Figure 7 A partially enlarged view of the main body of the electrode assembly shown;

[0094] Figure 9 A schematic diagram of the structure of the support member for a battery cell provided in some embodiments of this application;

[0095] Figure 10 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;

[0096] Figure 11 A partial cross-sectional view perpendicular to the second direction after the support member and multiple bends provided in some embodiments of this application are assembled together;

[0097] Figure 12 A partial cross-sectional view perpendicular to a first direction after the support member and multiple bent portions provided in some embodiments of this application are assembled together;

[0098] Figure 13A 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;

[0099] Figure 14 A front view of the isolation section of an electrode assembly provided in some embodiments of this application before bending;

[0100] Figure 15 This is a cross-sectional view of the bend in the isolation section of an electrode assembly provided in some embodiments of this application.

[0101] 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 - Fifth opening; 213 - End cap; 22 - Support; 221 - First surface; 2211 - First opening; 222 - First groove; 223 - Second surface; 2231 - Fourth opening; 2 24-Outer peripheral surface; 2241-First side surface; 2242-Second side surface; 2243-Third opening; 225-Support portion; 226-Connecting portion; 2261-First connecting portion; 2262-Second connecting portion; 227-Positioning hole; 23-Electrode assembly; 23a-Straight area; 23b-Bending area; 231-Main body; 231a-Positive electrode sheet; 231b-Negative electrode sheet; 231c-Separator; 23 11-Electrode segment; 2311a-First electrode segment; 2311b-Second electrode segment; 2312-Isolation segment; 2312a-Base film; 2312b-Coating; 23121-Body portion; 23122-Bending portion; 23122a-Second opening; 23122b-Arc region; 23123-Second groove; 23123a-First groove segment; 23123b-Second groove segment; 2313-Bending segment ; 2313a-First bending section; 2313b-Second bending section; 232-Positive electrode tab; 233-Negative electrode tab; 234-Gap channel; 2341-Connecting port; 24-Electrode terminal; 25-Current collector; 26-Pressure relief component; 27-Insulating component; 271-Insulating part; 200-Controller; 300-Motor; X-Thickness direction of the wall; Y-First direction; Z-Second direction; R-Wounding direction. Detailed Implementation

[0102] 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.

[0103] 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.

[0104] 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.

[0105] 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.

[0106] 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.

[0107] 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.

[0108] In this application, "multiple" means two or more (including two).

[0109] 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.

[0110] 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.

[0111] 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.

[0112] 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.

[0113] 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.

[0114] 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.).

[0115] 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 / 3O2 (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.

[0116] 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.

[0117] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0118] 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.).

[0119] 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.

[0120] 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.

[0121] 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.

[0122] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0123] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0124] 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.

[0125] 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.

[0126] In some embodiments, the battery cell also includes an electrolyte that acts as a conductor of ions between the positive and negative electrodes. The electrolyte includes an electrolyte salt and a solvent.

[0127] 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.

[0128] 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.

[0129] In some implementations, the electrode assembly has a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0130] In some implementations, the electrode assembly has a stacked structure.

[0131] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0132] 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.

[0133] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0134] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0135] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0136] In some implementations, the electrode assembly may be flat or polygonal in shape.

[0137] In some embodiments, the electrode assembly has tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0138] 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.

[0139] As an example, a battery cell can be 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.

[0140] 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.

[0141] 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.

[0142] 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.

[0143] 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.

[0144] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0145] 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.

[0146] 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.

[0147] 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.

[0148] 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.

[0149] 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.

[0150] For a typical battery cell, it usually includes a casing and electrode components and electrolyte housed within the casing. The electrode components include a positive electrode, a negative electrode, and a separator. The separator is positioned between the positive and negative electrodes to separate them. In related technologies, to reduce the risk of overlap between the positive and negative electrodes, the separator is usually positioned so that one end extends beyond the positive and negative electrodes to improve the separation effect. However, this battery cell structure causes the end of the separator extending beyond the positive and negative electrodes to be pressed against the bottom of the electrode components, especially in high-capacity battery cells where the size or height of the electrode components is large, causing the separator to extend beyond the positive electrode. The more tightly the positive and negative electrode plates are compressed, the greater the resistance and difficulty for the electrolyte to enter the electrode assembly from the bottom. Furthermore, the tighter the fit between the positive and negative electrode plates and the separator, and the smaller the gaps between the positive and negative electrode plates and the separator, the worse the electrolyte's ability to climb through the bottom of the electrode assembly and into the assembly. This makes the electrode assembly prone to poor electrolyte wetting during cycle use, resulting in poor performance of the battery cells and even increasing the risk of metal precipitation during use, thus hindering the reliability of the battery cells.

[0151] 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, a support member, 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 disposed between each pair of adjacent electrode segments. The isolation segment is bent to form an interconnected body portion and a bent portion. The body portion is located between two adjacent electrode segments, and the bent portion is located on the side of the electrode segment near the wall. The bent portions of two adjacent isolation segments are stacked. The thickness direction of the wall is perpendicular to the first direction. The support member is disposed between the electrode assembly and the wall in the thickness direction of the wall and is configured to support the electrode assembly. The support member has at least one first groove. Along the thickness direction of the wall, the first groove has a first opening facing the bent portion. At least one bent portion passes through the first opening of the at least one first groove and extends into the first groove.

[0152] 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 electrode segments and a bent portion connected to one end of the body portion. The bent portion is located on the side of the 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. Correspondingly, a support member is also provided between the electrode assembly and the wall portion, enabling the support member to provide support and separation between the electrode assembly and the wall portion, further reducing the risk of overlap and impact between the electrode assembly and the wall portion. Specifically, a first groove is provided on the support member, and the first groove has a bending direction facing the wall portion in the thickness direction of the wall portion. The first opening of the bend, and at least one bend passing through the first opening of at least one first groove and extending into the first groove, increases the contact area and effect between the bend and the electrolyte after the electrolyte enters the first groove. This facilitates the electrolyte passing through the bend and, under capillary action, climbing through the gaps between the bends and the stacked bends to the interior of the electrode assembly and wet multiple electrode segments. This reduces the difficulty of the electrolyte entering the electrode assembly from the end near the wall and improves the smoothness of electrolyte entry into the electrode assembly. As a result, the battery cell with this structure can improve the effect of electrolyte entering the electrode assembly and wetting multiple electrode segments, thus alleviating the phenomenon of poor electrolyte wetting effect during the cycle of use and reducing the risk of metal precipitation during use. This is beneficial to improving the performance and reliability of the battery cell.

[0153] 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.

[0154] 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.

[0155] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device according to an embodiment of this application.

[0156] 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.

[0157] 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.

[0158] 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.

[0159] 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.

[0160] 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.

[0161] 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.

[0162] 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.

[0163] 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, a prism, or other shapes. For example, in... Figure 3 In the middle, the battery cell 20 has a cuboid structure.

[0164] According to some embodiments of this application, refer to Figure 3 Please refer to further details. Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 and Figure 12 , 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 231 of the electrode assembly 23 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 231 of the electrode assembly 23 provided in some embodiments of this application, perpendicular to the second direction Z. Figure 8 for Figure 7 A partially enlarged view of the main body 231 of the electrode assembly 23 shown. Figure 9 This is a schematic diagram of the structure of the support member 22 for the battery cell 20 provided in some embodiments of this application. Figure 10 This is a front view of the support member 22 of the battery cell 20 provided in some embodiments of this application in the thickness direction X of the wall portion. Figure 11 A partial cross-sectional view perpendicular to the second direction Z, showing the support member 22 and the plurality of bent portions 23122 provided in some embodiments of this application after they are assembled together. Figure 12 This is a partial cross-sectional view perpendicular to the first direction Y, showing the support member 22 and multiple bends 23122 provided in some embodiments of this application after being assembled together. This application provides a battery cell 20, which includes a housing 21, an electrolyte, a support member 22, and at least one electrode assembly 23. The housing 21 has a wall portion 211. The electrolyte is contained within the housing 21. Electrode assembly 23 is disposed within housing 21. Electrode assembly 23 has a flat region 23a, which includes multiple electrode segments 2311 and multiple isolation segments 2312. The multiple electrode segments 2311 are stacked along the first direction Y, and an isolation segment 2312 is disposed between each two adjacent electrode segments 2311. The isolation segment 2312 is bent to form an interconnected body portion 23121 and a bent portion 23122. The body portion 23121 is located between two adjacent electrode segments 2311, and the bent portion 23122 is located on the side of the electrode segment 2311 near the wall portion 211. The bent portions 23122 of two adjacent isolation segments 2312 are stacked. The thickness direction X of the wall portion is perpendicular to the first direction Y. The support member 22 is disposed between the electrode assembly 23 and the wall portion 211 in the thickness direction X of the wall portion, and the support member 22 is configured to support the electrode assembly 23. The support member 22 is provided with at least one first groove 222. Along the thickness direction X of the wall portion, the support member 22 has a first surface 221 facing the electrode assembly 23. The first groove 222 penetrates the first surface 221 and forms a first opening 2211 facing the bending portion 23122. At least one bending portion 23122 passes through the first opening 2211 of at least one first groove 222 and extends into the first groove 222.

[0165] The outer casing 21 serves to house the electrolyte and electrode assembly 23. The outer casing 21 can have various structural forms, such as a cuboid or prism structure. Similarly, the outer casing 21 can be made of various materials, such as copper, iron, aluminum, steel, or aluminum alloy.

[0166] 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 23 and has a fifth opening 2121. That is, the housing 212 is a hollow structure with one end open. The end cap 213 covers the fifth opening 2121 of the housing 212 and forms a sealed connection to form a closed space for accommodating the electrode assembly 23 and the electrolyte.

[0167] 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 fifth opening 2121. The bottom wall and the end cap 213 are arranged opposite to each other. The side wall and the bottom wall together define a receiving cavity, in which the electrode assembly 23 is received.

[0168] 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.

[0169] The wall portion 211 is located at the bottom of the electrode assembly 23 in the thickness direction X of the wall portion, and the wall portion 211 is configured to support the electrode assembly 23. That is, the electrode assembly 23 is placed on the wall portion 211, and the wall portion 211 is a structure located below the electrode assembly 23 in the direction of gravity or approximately the direction of gravity. Correspondingly, the wall portion 211 can support the electrode assembly 23, and the thickness direction X of the wall portion is the direction of gravity or approximately the direction of gravity.

[0170] Optionally, the housing 212 can be of various shapes, such as a cuboid or prism structure. The shape of the housing 212 can be determined according to the specific shape of the electrode assembly 23. Exemplarily, in an embodiment of this application, the outer shell 21 formed by the housing 212 and the end cap 213 has a cuboid structure.

[0171] 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 open sides on opposite sides. One end cap 213 is fitted onto a fifth opening 2121 of the housing 212 and forms a sealed connection to form a closed space for accommodating the electrode assembly 23 and the electrolyte. That is, the housing 212 has a fifth opening 2121 on opposite sides, and the two end caps 213 are fitted onto the sides of the housing 212 respectively to close the corresponding fifth opening 2121.

[0172] In this embodiment of the application, the electrode assembly 23 includes a main body 231, a positive electrode tab 232 and a negative electrode tab 233. The main body 231 is the main component of the electrode assembly 23 for chemical reactions to occur inside the battery cell 20. The positive electrode tab 232 and the negative electrode tab 233 are both connected to the main body 231 and are spaced apart.

[0173] Optionally, the structure of the main body 231 of the electrode assembly 23 can be various. The main body 231 of the electrode assembly 23 can be a wound structure formed by winding the positive electrode 231a, the negative electrode 231b and the separator 231c, or it can be a stacked structure formed by alternately stacking the positive electrode 231a, the negative electrode 231b and the separator 231c. The separator 231c is disposed between the positive electrode 231a and the negative electrode 231b to insulate and isolate the positive electrode 231a and the negative electrode 231b.

[0174] For example, the separator 231c 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.

[0175] For example, in Figure 4 and Figure 5 In this embodiment, the positive electrode 232 and the negative electrode 233 are both connected to the same end of the main body 231 in the thickness direction X of the wall. Of course, in other embodiments, the positive electrode 232 and the negative electrode 233 may also be structures that are respectively connected to the two ends of the main body 231 in the thickness direction X of the wall.

[0176] The positive electrode tab 232 of the electrode assembly 23 is a multilayer metal foil structure connected to one end of the positive electrode 231a in the thickness direction X of the wall portion. Correspondingly, the negative electrode tab 233 of the electrode assembly 23 is a multilayer metal foil structure connected to one end of the negative electrode 231b in the thickness direction X of the wall portion. It should be noted that the positive electrode tab 232 and the positive electrode plate 231a can be separate structures. For example, the positive electrode tab 232 and the positive current collector of the positive electrode plate 231a can be welded together. Of course, the positive electrode tab 232 and the positive electrode plate 231a can also be integrally formed. For example, the positive current collector of the positive electrode tab 232 and the positive current collector of the positive electrode plate 231a can be formed by integrally cutting the same metal foil to form the positive electrode tab 232 and the positive current collector. Similarly, the negative electrode tab 233 and the negative electrode plate 231b can be separate structures. For example, the negative electrode tab 233 and the negative current collector of the negative electrode plate 231b can be welded together. Of course, the negative electrode tab 233 and the negative electrode plate 231b can also be integrally formed. For example, the negative current collector of the negative electrode tab 233 and the negative current collector of the negative electrode plate 231b can be formed by integrally cutting the same metal foil to form the negative electrode tab 233 and the negative current collector.

[0177] In this embodiment, the electrode assembly 23 has a flat region 23a, that is, the flat region 23a is the flat portion of the main body 231 of the electrode assembly 23. For example, in... Figure 6 In this structure, electrode assembly 23 has a wound structure, and the central axis of the winding of electrode assembly 23 extends along the thickness direction X of the wall portion. Correspondingly, the main body portion 231 also has two bending regions 23b, and the two bending regions 23b are respectively connected to the two opposite ends of the straight region 23a 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 23 has a stacked structure, refer to... Figure 13 As shown, Figure 13 The cross-sectional view of the main body 231 of the electrode assembly 23 provided in some embodiments of this application, perpendicular to the thickness direction X of the wall portion, shows that the entire main body 231 of the electrode assembly 23 is a flat region 23a, that is, the main body 231 of the electrode assembly 23 only includes the flat region 23a.

[0178] The flat region 23a includes a plurality of electrode segments 2311 stacked along the first direction Y. Each electrode segment 2311 includes a first electrode segment 2311a and a second electrode segment 2311b with opposite polarities. The first electrode segments 2311a and the second electrode segments 2311b are stacked and alternately arranged along the first direction Y. It should be noted that if the electrode assembly 23 has a wound structure, see [reference needed]. Figure 6 As shown, the multiple electrode segments 2311 are multiple straight segments of the positive electrode 231a located in the straight region 23a and multiple straight segments of the negative electrode 231b located in the straight region 23a. In other words, the electrode segments 2311 are a part of the positive electrode 231a located in the straight region 23a or a part of the negative electrode 231b located in the straight region 23a.

[0179] The multiple electrode segments 2311 include multiple first electrode segments 2311a with the same polarity, the first electrode segments 2311a being the portion of the positive electrode 231a located in the flat region 23a, and the multiple electrode segments 2311 also include multiple second electrode segments 2311b with the same polarity, the second electrode segments 2311b being the portion of the negative electrode 231b located in the flat region 23a. Correspondingly, the main body 231 also includes a plurality of bent segments 2313, including a first bent segment 2313a and a second bent segment 2313b. The first bent segment 2313a is the portion of the positive electrode 231a located within the bent region 23b, and the second bent segment 2313b is the portion of the negative electrode 231b located within the bent region 23b. In the winding direction R of the electrode assembly 23, the first bent segment 2313a connects two adjacent first electrode segments 2311a, and the first bent segment 2313a and the first electrode segments 2311a are alternately arranged. Correspondingly, in the winding direction R of the electrode assembly 23, the second bent segment 2313b connects two adjacent second electrode segments 2311b, and the second bent segment 2313b and the second electrode segments 2311b are alternately arranged.

[0180] It should be noted that if the electrode assembly 23 is a stacked structure, then the multiple electrode segments 2311 are multiple positive electrode plates 231a and multiple negative electrode plates 231b of the electrode assembly 23. Correspondingly, the first electrode segment 2311a is a positive electrode plate 231a, the second electrode segment 2311b is a negative electrode plate 231b, and the first electrode segment 2311a and the second electrode segment 2311b are arranged in an alternating stacked structure along the first direction Y.

[0181] The end of the first pole segment 2311a near the wall portion 211 in the thickness direction X of the wall portion does not extend beyond the second pole segment 2311b. That is, in the thickness direction X of the wall portion, the second pole segment 2311b can be a structure that extends beyond the end of the first pole segment 2311a near the wall portion 211, or it can be a structure in which the end of the second pole segment 2311b near the wall portion 211 and the end of the first pole segment 2311a near the wall portion 211 are flush with each other.

[0182] For example, in Figure 8 In the first electrode segment 2311a, at least a portion of the positive electrode 231a is formed, and the second electrode segment 2311b is at least a portion of the negative electrode 231b. Correspondingly, in order to reduce the risk of metal element precipitation during the use of the electrode assembly 23, the second electrode segment 2311b is a structure that extends beyond the end of the first electrode segment 2311a near the wall 211 in the thickness direction X of the wall portion.

[0183] The battery cell 20 includes at least one electrode assembly 23, meaning that the number of electrode assemblies 23 housed within the housing 21 can be one or more. For example, in... Figure 4In this structure, the electrode assembly 23 has a wound structure. Correspondingly, there can be one or more electrode assemblies 23 housed in the outer casing 21. After the positive electrode 231a and negative electrode 231b of the main body portion 231 of each electrode assembly 23 are wound, the tail end of the separator 231c of the main body portion 231 of each electrode assembly 23 continues to be wound and correspondingly covers the outside of the positive electrode 231a and negative electrode 231b to form the main body portion 231 of a single electrode assembly 23. See [link to relevant documentation]. Figure 4 As shown, two electrode assemblies 23 are disposed within the casing 21 of the battery cell 20. The two electrode assemblies 23 are stacked along the first direction Y. Of course, in other embodiments, the electrode assemblies 23 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 231 of the electrode assembly 23 is the thickness direction X of the wall portion, the thickness direction of the main body portion 231 of the electrode assembly 23 is the first direction Y, and the width direction of the main body portion 231 of the electrode assembly 23 is the second direction Z. It should be noted that if the electrode assembly 23 has a stacked structure, the number of electrode assemblies 23 housed within the casing 21 is usually one.

[0184] In this embodiment, the flat region 23a further includes multiple isolation segments 2312, and an isolation segment 2312 is provided between each pair of adjacent pole segments 2311. It should be noted that the isolation segment 2312 is the part of the isolation member 231c located in the flat region 23a. The multiple isolation segments 2312 are arranged along the first direction Y, and the isolation member 231c is a structure that separates the positive pole piece 231a and the negative pole piece 231b, so that an isolation segment 2312 is provided between each pair of adjacent pole segments 2311. That is, the isolation member 231c includes multiple isolation segments 2312 located in the flat region 23a and arranged along the first direction Y, and each isolation segment 2312 is used to separate the adjacent first pole segment 2311a and second pole segment 2311b.

[0185] If the electrode assembly 23 is a wound structure, the electrode assembly 23 includes two isolation members 231c, and the negative electrode sheet 231b is clamped between the two isolation members 231c. The portions of the two isolation members 231c located in the flat region 23a are isolation segments 2312. Correspondingly, each isolation member 231c also includes a connecting segment located in the bending region 23b, and the connecting segment connects two adjacent isolation segments 2312 in the winding direction R of the electrode assembly 23. If the electrode assembly 23 is a stacked structure, the electrode assembly 23 includes a plurality of isolation members 231c arranged along the first direction Y. An isolation member 231c is provided between each pair of adjacent electrode segments 2311. Correspondingly, the isolation member 231c is an isolation segment 2312.

[0186] The isolation segment 2312 is bent to form an interconnected body portion 23121 and a bent portion 23122. The body portion 23121 is located between two adjacent pole segments 2311, and the bent portion 23122 is located on the side of the pole segment 2311 near the wall portion 211. The bent portions 23122 of two adjacent isolation segments 2312 are stacked. That is, the isolation segment 2312 of the isolation member 231c located in the flat region 23a has a structure formed by bending into two parts. The part of the isolation segment 2312 that is sandwiched between two adjacent pole segments 2311 is the body portion 2312 of the isolation segment 2312. At least a portion of 1, and the structure of the isolation segment 2312 extending beyond the end of the pole segment 2311 near the wall 211 in the thickness direction X of the wall portion and being bent and located at the end of the multiple pole segments 2311 near the wall portion 211 is a bent portion 23122, so that the isolation segment 2312 is bent to form an L-shaped structure, and the bent portions 23122 of the multiple isolation segments 2312 located in the straight area 23a are located at the end of the multiple pole segments 2311 facing the wall portion 211, and the bent portions 23122 of each two adjacent isolation segments 2312 are stacked on each other along the thickness direction X of the wall portion.

[0187] In this embodiment, the battery cell 20 further includes a support member 22. The support member 22 is disposed between the electrode assembly 23 and the wall portion 211 in the thickness direction X of the wall portion and abuts against the electrode assembly 23 to separate the wall portion 211 and the electrode assembly 23. The support member 22 is configured to support the electrode assembly 23, that is, the electrode assembly 23 is placed on the support member 22. The support member 22 is a structure located at the bottom of the electrode assembly 23 in the direction of gravity or approximately the direction of gravity. Correspondingly, the wall portion 211 is a structure located at the bottom of the support member 22 in the direction of gravity or approximately the direction of gravity, so that the wall portion 211 can support the electrode assembly 23 through the support member 22.

[0188] Along the thickness direction X of the wall portion, the first groove 222 has a first opening 2211 facing the bent portion 23122. That is, the support member 22 has a first surface 221 facing the electrode assembly 23, and the first groove 222 is a structure that penetrates the first surface 221 and forms the first opening 2211, such that the first opening 2211 is formed on the first surface 221 of the support member 22 facing the electrode assembly 23. In other words, the first groove 222 provided on the support member 22 is a structure that extends to the first surface 221 on the side of the support member 22 facing the electrode assembly 23, so that the area of ​​the first surface 221 penetrated by the first groove 222 forms the first opening 2211. Optionally, the shape of the first groove 222 can be various, such as strip, circle, triangle or ring, etc. Similarly, the number of first grooves 222 can be one or more.

[0189] For example, the material of the support member 22 may be plastic, rubber or silicone, etc.

[0190] In this embodiment, at least one bent portion 23122 passes through the first opening 2211 of at least one first groove 222 and extends into the first groove 222, that is, at least one bent portion 23122 is a structure inserted into at least one first groove 222 along the thickness direction X of the wall portion. It should be noted that in embodiments where multiple first grooves 222 are provided on the support member 22, each bent portion 23122 can be a structure inserted into one first groove 222 or a structure inserted into multiple first grooves 222. Similarly, each first groove 222 can be a structure that only accommodates a portion of one bent portion 23122 or a structure that accommodates portions of multiple bent portions 23122.

[0191] In this embodiment, the electrolyte plays a role in conducting ions between the positive electrode 231a and the negative electrode 231b, and the electrolyte may include electrolyte salt and solvent.

[0192] 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.

[0193] 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.

[0194] In some embodiments, see Figure 3 and Figure 4 As shown, the battery cell 20 may also include an electrode terminal 24, which is insulated and mounted on the housing 21. The electrode terminal 24 is used to electrically connect with the electrode assembly 23 to output or input electrical energy of the battery cell 20.

[0195] It should be noted that the electrode terminal 24 is insulated and mounted on the housing 21, meaning that there is no electrical connection between the electrode terminal 24 and the housing 21.

[0196] For example, electrode terminals 24 are disposed on end caps 213 of housing 21.

[0197] In this embodiment of the application, the battery cell 20 includes two electrode terminals 24, which are disposed at intervals along the second direction Z on the end cap 213 of the housing 21. The two electrode terminals 24 are electrically connected to the positive electrode tab 232 and the negative electrode tab 233 of the electrode assembly 23, respectively, so as to realize the input or output of electrical energy of the battery cell 20.

[0198] For example, the electrode terminal 24 can be made of various materials, such as copper, iron, aluminum, steel or aluminum alloy.

[0199] For example, both the positive tab 232 and the negative tab 233 are connected to one end of the main body 231 facing the end cap 213 in the thickness direction X of the wall.

[0200] In some embodiments, see Figure 4 As shown, the battery cell 20 may also include two current collectors 25. Both current collectors 25 are disposed inside the housing 21 and are spaced apart. One current collector 25 connects one electrode terminal 24 and the positive tab 232 of multiple electrode assemblies 23, and the other current collector 25 connects another electrode terminal 24 and the negative tab 233 of multiple electrode assemblies 23, so as to realize the electrical connection between the two electrode terminals 24 and the electrode assemblies 23, which helps to reduce the assembly difficulty between the electrode assemblies 23 and the electrode terminals 24.

[0201] For example, the current collector 25 is welded to the positive electrode tab 232, and similarly, the current collector 25 is welded to the negative electrode tab 233. Of course, in other embodiments, the current collector 25 and the positive electrode tab 232, as well as the current collector 25 and the negative electrode tab 233, may also have a structure such as mutual contact or snap-fit.

[0202] For example, the material of the current collector 25 can be various, such as copper, iron, aluminum, steel or aluminum alloy.

[0203] In some embodiments, see Figure 3 and Figure 4 As shown, the battery cell 20 may also include a pressure relief component 26, which is disposed on the housing 21. The pressure relief component 26 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.

[0204] Optionally, the pressure relief component 26 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 26 and the outer casing 21 can be integrally formed or separately disposed. If the pressure relief component 26 and the outer casing 21 are separately disposed, the pressure relief component 26 can be connected to the outer casing 21 by welding or other means. Correspondingly, the pressure relief component 26 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 26 and the outer casing 21 are integrally formed, the pressure relief component 26 is an area on the outer casing 21 with a weak structure, such as an area on the outer casing 21 with a groove.

[0205] In some embodiments, the battery cell 20 may further include an insulating member 27, which covers the outside of the main body 231 of the electrode assembly 23 to insulate and isolate the main body 231 from the outer casing 21.

[0206] The insulating element 27 is an insulating film structure covering the outside of the main body 231 of the electrode assembly 23. For example, the material of the insulating element 27 can be polyethylene or polypropylene, etc.

[0207] It should be noted that in the embodiment where the insulating member 27 covers the outer side of the main body 231 of the electrode assembly 23, the support member 22 can be a structure located on the side of the insulating member 27 facing the main body 231, that is, the support member 22 is located on the inner side of the insulating member 27. Correspondingly, the support member 22 directly abuts against the electrode assembly 23. Of course, the support member 22 can be a structure located on the side of the insulating member 27 away from the main body 231, that is, the support member 22 is located on the outer side of the insulating member 27. Correspondingly, the support member 22 and the electrode assembly 23 indirectly abut against each other through the insulating member 27.

[0208] In this embodiment, the flat region 23a of the electrode assembly 23 has a plurality of isolation segments 2312 arranged along the first direction Y. The isolation segments 2312 are bent to form a body portion 23121 located between two adjacent electrode segments 2311 and a bent portion 23122 connected to one end of the body portion 23121. The bent portion 23122 is located on the side of the electrode segment 2311 near the wall portion 211 in the thickness direction X of the wall portion. The bent portions 23122 of two adjacent isolation segments 2312 are stacked, so that the plurality of bent portions 23122 can also serve to separate the wall portion 211 and the electrode segment 2311. Furthermore, the isolation segment 2312 with this structure can improve the effect of separating two adjacent electrode segments 2311, thereby reducing the risk of overlap between the two adjacent electrode segments 2311 near the wall 211. Correspondingly, a support member 22 is also provided between the electrode assembly 23 and the wall 211, so that the support member 22 can play a supporting and separating role between the electrode assembly 23 and the wall 211, which is conducive to further reducing the risk of overlap and collision between the electrode assembly 23 and the wall 211. Among them, by providing a first groove 222 on the support member 22, the first groove 22 2. The wall portion has a first opening 2211 facing the bending portion 23122 in the thickness direction X, and at least one bending portion 23122 passes through the first opening 2211 of at least one first groove 222 and extends into the first groove 222. This increases the contact area and effect between the bending portion 23122 and the electrolyte after the electrolyte enters the first groove 222, thereby facilitating the electrolyte to pass through the bending portion 23122 and, under the action of capillary action, climb through the bending portion 23122 and the gaps between the stacked bending portions 23122 to the interior of the electrode assembly 23 and to the multiple electrode segments 231. The immersion process helps reduce the difficulty of electrolyte entering the electrode assembly 23 from the end near the wall 211, and also improves the smoothness of electrolyte entering the electrode assembly 23. As a result, the battery cell 20 with this structure can improve the effect of electrolyte entering the electrode assembly 23 to immerse multiple electrode segments 2311, thereby alleviating the phenomenon of poor electrolyte immersion during the cyclic use of the electrode assembly 23, and reducing the risk of metal precipitation during the use of the battery cell 20, which is beneficial to improving the performance and reliability of the battery cell 20.

[0209] According to some embodiments of this application, in conjunction with Figure 8 , Figure 11 and Figure 12As shown, along the thickness direction X of the wall portion, multiple bends 23122 pass through the first opening 2211 of the same first groove 222 and extend into the first groove 222. That is, portions of multiple bends 23122 are inserted into the same first groove 222, i.e., at least one first groove 222 contains portions of multiple bends 23122.

[0210] In this embodiment, by configuring the stacked multiple bends 23122 to pass through the first opening 2211 of the same first groove 222 and extend into the first groove 222, at least a portion of the multiple bends 23122 can be accommodated in the same first groove 222. This facilitates the simultaneous contact between the electrolyte in the first groove 222 and the multiple bends 23122, which is beneficial to further improve the efficiency of the electrolyte climbing up into the electrode assembly 23 through the bends 23122, thereby further improving the wetting effect of the electrolyte on the electrode assembly 23.

[0211] According to some embodiments of this application, in conjunction with Figure 8 , Figure 9 , Figure 10 and Figure 12 As shown, the support member 22 may be provided with a plurality of first grooves 222. Along the thickness direction X of the wall, at least one bent portion 23122 passes through the first opening 2211 of the plurality of first grooves 222 and extends into the plurality of first grooves 222. That is, different regions of at least one bent portion 23122 are respectively inserted into the plurality of first grooves 222, such that each of the plurality of first grooves 222 accommodates a portion of the same bent portion 23122.

[0212] In this embodiment, by providing multiple first grooves 222 on the support member 22, and at least one bent portion 23122 being inserted into the multiple first grooves 222, the contact area between the bent portion 23122 and the electrolyte in the first grooves 222 is increased, and multiple positions in different areas of the bent portion 23122 are in contact with the electrolyte in the first grooves 222. This increases the path and efficiency of the electrolyte climbing through the bent portion 23122 into the electrode assembly 23, thereby further improving the wetting effect of the electrolyte on the electrode assembly 23.

[0213] In some embodiments, see Figure 9 , Figure 10 and Figure 12As shown, the first groove 222 extends along the first direction Y, and the support member 22 is provided with multiple rows of first grooves 222 arranged at intervals along the second direction Z, and each row of first grooves 222 includes at least one first groove 222. The thickness direction X of the wall portion, the first direction Y, and the second direction Z are perpendicular to each other. Along the thickness direction X of the wall portion, the bent portion 23122 is disposed opposite to the multiple first grooves 222, and multiple regions of the bent portion 23122 in the second direction Z respectively pass through the first opening 2211 of the corresponding first groove 222 and extend into the corresponding first groove 222.

[0214] In the same bending portion 23122, the portion of the bending portion 23122 that is accommodated in a first groove 222 has a structure that extends along the first direction Y, and the different regions of the bending portion 23122 that are accommodated in multiple first grooves 222 have a structure that are spaced apart along the second direction Z.

[0215] In this embodiment, by providing multiple rows of first grooves 222 arranged at intervals along the second direction Z on the support member 22, and by inserting multiple regions of the bent portion 23122 in the second direction Z into the corresponding first grooves 222, the bent portion 23122 can contact the electrolyte in the first grooves 222 at multiple positions in the second direction Z. This facilitates manufacturing and assembly, reducing the assembly difficulty between the electrode assembly 23 and the support member 22. Furthermore, it enables the electrolyte to climb from multiple positions of the bent portion 23122 into the electrode assembly 23 in the second direction Z, increasing the path and efficiency of the electrolyte climbing into the electrode assembly 23 through the bent portion 23122, thereby further improving the wetting effect of the electrolyte on the electrode assembly 23.

[0216] According to some embodiments of this application, see Figure 12 As shown, along the thickness direction X of the wall portion, the bent portion 23122 bends to form an arc-shaped area 23122b corresponding to the area of ​​the first opening 2211, and the arc-shaped area 23122b passes through the first opening 2211 of the corresponding first groove 222 and extends into the first groove 222.

[0217] The arc-shaped region 23122b is the portion of the bent portion 23122 that is correspondingly provided with the first opening 2211 of the support member 22 in the thickness direction X of the wall portion and is bent towards the wall portion 211 and inserted into the first groove 222, so that the arc-shaped region 23122b is a structure in which the bent portion 23122 is bent towards the wall portion 211 and protrudes from the first surface 221 of the support member 22. Correspondingly, the arc-shaped region 23122b passes through the first opening 2211 of the corresponding first groove 222 and extends into the first groove 222, that is, the arc-shaped region 23122b is a structure in which it is inserted into the corresponding first groove 222 in the thickness direction X of the wall portion.

[0218] It should be noted that in the embodiment where the support member 22 is provided with a plurality of first grooves 222 arranged at intervals along the second direction Z and the first grooves 222 extend along the first direction Y, the bent portion 23122 is formed with a plurality of arc-shaped regions 23122b arranged at intervals along the second direction Z, and the arc-shaped regions 23122b are strip structures extending along the first direction Y.

[0219] In this embodiment, by setting the area of ​​the bent portion 23122 corresponding to the first opening 2211 as a structure that bends to form an arc-shaped area 23122b and inserts it into the first groove 222, the portion of the bent portion 23122 that passes through the first opening 2211 and extends into the first groove 222 is the area where the bent portion 23122 forms an arc-shaped structure after bending. This structure facilitates the insertion of the arc-shaped area 23122b into the first groove 222 along the thickness direction X of the wall, which helps to reduce the difficulty of the bent portion 23122 passing through the first opening 2211 and extending into the first groove 222. On the other hand, it can further increase the contact area between the portion of the bent portion 23122 located in the first groove 222 and the electrolyte, which helps to further improve the efficiency of the electrolyte climbing up to the electrode assembly 23 through the bent portion 23122, thereby further improving the wetting effect of the electrolyte on the electrode assembly 23.

[0220] In some embodiments, please continue to see Figure 12 As shown, multiple bent portions 23122 are stacked with arc-shaped regions 23122b corresponding to the same first opening 2211 along the thickness direction X of the wall portion and extend into the corresponding first groove 222. Along the thickness direction X of the wall portion, in two adjacent arc-shaped regions 23122b, the maximum curvature of the arc-shaped region 23122b closer to the wall portion 211 is greater than the maximum curvature of the arc-shaped region 23122b farther from the wall portion 211.

[0221] Among them, multiple bends 23122 are stacked with arc-shaped areas 23122b corresponding to the same first opening 2211 in the thickness direction X of the wall and extend into the corresponding first groove 222. That is, multiple bends 23122 have arc-shaped areas 23122b at the same first opening 2211, and the arc-shaped areas 23122b of multiple bends 23122 at the same first opening 2211 are stacked along the thickness direction X of the wall and inserted into the same first groove 222.

[0222] In two adjacent arc-shaped regions 23122b, the maximum curvature of the arc-shaped region 23122b closer to the wall 211 is greater than the maximum curvature of the arc-shaped region 23122b farther from the wall 211. This results in at least a portion of the curvature of the arc-shaped region 23122b closer to the wall 211 being greater than the curvature of any position in the arc-shaped region 23122b farther from the wall 211. In other words, in the arc-shaped regions 23122b of the multiple bends 23122 at the same first opening 2211, at least a portion of the arc-shaped region 23122b closer to the wall 211 has a greater degree of curvature. This also results in the gap channel 234 located between two adjacent arc-shaped regions 23122b having a larger dimension in the thickness direction X of the wall.

[0223] In this embodiment, the arc-shaped regions 23122b of the multiple bends 23122 at the same first opening 2211 are stacked, and the maximum curvature of the arc-shaped regions 23122b closer to the wall 211 is relatively larger. This makes at least a portion of the arc-shaped regions 23122b closer to the wall 211 have a greater degree of curvature. The battery cell 20 with this structure can increase the gap between the arc-shaped regions 23122b of two adjacent bends 23122, which is beneficial to further increase the size of the channel through which the electrolyte passes between two adjacent bends 23122. This can further improve the smoothness of the electrolyte entering the electrode assembly 23 from the end near the wall 211, thereby further improving the effect of the electrolyte entering the electrode assembly 23 to wet the multiple electrode segments 2311.

[0224] In some embodiments, combined with Figure 8 , Figure 11 and Figure 12 As shown, along the thickness direction X of the wall portion, a gap channel 234 is formed between two adjacent bends 23122. A communication port 2341 is formed at one end of the gap channel 234 away from the body portion 23121, and at least a portion of the communication port 2341 is located in the first groove 222 and communicates with the first groove 222.

[0225] The gap channel 234 is a gap structure between each two adjacent bends 23122 in a plurality of stacked bends 23122. Correspondingly, a connecting port 2341 is formed at one end of the gap channel 234 away from the main body 23121. At least a portion of the connecting port 2341 is located in the first groove 222 and communicates with the first groove 222. That is, the gap channel 234 forms an open opening at one end of the bend 23122 away from the main body 23121, and the gap channel 234 is inserted into the first groove 222 at one end of the bend 23122 away from the main body 23121, so as to connect the gap channel 234 and the first groove 222 through the connecting port 2341.

[0226] In this embodiment, by setting the communication port 2341 at the end of the gap channel 234 away from the body portion 23121 to be at least partially located in and connected to the first groove 222, the gap channel 234 between two adjacent bends 23122 can communicate with the first groove 222 at the end of the bend 23122 away from the body portion 23121. This facilitates the electrolyte in the first groove 222 to enter the gap channel 234 between the two adjacent bends 23122 from the communication port 2341 and then climb to the interior of the electrode assembly 23. This further improves the smoothness of the electrolyte entering the electrode assembly 23 from the end of the electrode assembly 23 near the wall portion 211, thereby further improving the wetting effect of the electrolyte on the electrode assembly 23.

[0227] In some embodiments, see Figure 11 As shown, the maximum dimension of the region of the gap channel 234 corresponding to the first opening 2211 in the thickness direction X of the wall gradually increases from the end of the bend 23122 connected to the body portion 23121 to the end of the bend 23122 away from the body portion 23121. In other words, the maximum distance between the portions of two adjacent bends 23122 corresponding to the first opening 2211 in the thickness direction X of the wall gradually decreases from the end connected to the body portion 23121 to the end away from the body portion 23121, so that the maximum distance between the portions of two adjacent bends 23122 corresponding to the first opening 2211 in the thickness direction X of the wall is maximized at the location of the connecting opening 2341 of the gap channel 234.

[0228] In this embodiment, by setting the maximum size of the area of ​​the gap channel 234 corresponding to the first opening 2211 in the thickness direction X of the wall to gradually increase from one end of the bend 23122 connected to the body 23121 to the end of the bend 23122 away from the body 23121, the gap channel 234 is positioned at the position of the connecting port 2341 with the largest size in the thickness direction X of the wall. This facilitates the entry of electrolyte in the first groove 222 into the gap channel 234 through the connecting port 2341, further reducing the difficulty of electrolyte entering the gap channel 234. This further improves the smoothness of electrolyte entering the electrode assembly 23 from the end of the electrode assembly 23 near the wall 211, thereby further improving the wetting effect of electrolyte on the electrode assembly 23.

[0229] In some embodiments, please continue to see Figure 11 As shown, along the thickness direction X of the wall portion, in two adjacent gap channels 234, the maximum dimension of the portion of the connecting opening 2341 of the gap channel 234 closer to the wall portion 211 located in the first groove 222 in the thickness direction X of the wall portion is greater than the maximum dimension of the portion of the connecting opening 2341 of the gap channel 234 farther from the wall portion 211 located in the first groove 222 in the thickness direction X of the wall portion.

[0230] Among them, the portion of the connecting opening 2341 of the gap channel 234 located in the first groove 222 is the end of the gap channel 234 away from the main body 23121 that is inserted into the first groove 222 and communicates with the first groove 222. Correspondingly, in two adjacent gap channels 234, the maximum dimension of the portion of the connecting opening 2341 of the gap channel 234 closer to the wall 211 located in the first groove 222 in the thickness direction X of the wall is greater than the maximum dimension of the portion of the connecting opening 2341 of the gap channel 234 away from the wall 211 located in the first groove 222 in the thickness direction X of the wall. That is to say, among the multiple bends 23122, the larger the maximum distance in the thickness direction X of the bend 23122 closer to the wall 211 that is the end of the bend 23122 away from the main body 23121 and inserted into the first groove 222, the greater the distance between the bend 23122 and the adjacent bend 23122.

[0231] In this embodiment, by setting the maximum dimension of the portion of the connecting opening 2341 of the gap channel 234 near the wall 211 located in the first groove 222 in the thickness direction X of the wall to be greater than the maximum dimension of the portion of the connecting opening 2341 of the gap channel 234 far from the wall 211 located in the first groove 222 in the thickness direction X of the wall, the portion of the gap channel 234 closer to the wall 211 has a larger maximum dimension of the position of the connecting opening 2341 corresponding to the first opening 2211 in the thickness direction X of the wall among the multiple gap channels 234 formed by the stacking of multiple bends 23122. This facilitates the entry of electrolyte in the first groove 222 into different gap channels 234, further reducing the difficulty of electrolyte entering between the stacked multiple bends 23122, and further improving the smoothness of electrolyte entering the electrode assembly 23 from the end of the electrode assembly 23 near the wall 211, thereby further improving the wetting effect of electrolyte on the electrode assembly 23.

[0232] According to some embodiments of this application, see Figure 6 , Figure 7 and Figure 8 As shown, the plurality of pole segments 2311 include a first pole segment 2311a and a second pole segment 2311b alternately arranged along a first direction Y. The first pole segment 2311a and the second pole segment 2311b have opposite polarities, and the end of the first pole segment 2311a near the wall portion 211 in the thickness direction X of the wall portion does not extend beyond the second pole segment 2311b. The body portion 23121 is located between two adjacent second pole segments 2311b, and the bent portion 23122 is located on the side of the second pole segment 2311b near the wall portion 211 in the thickness direction X of the wall portion.

[0233] Wherein, the first electrode segment 2311a and the second electrode segment 2311b have opposite polarities, that is, the first electrode segment 2311a and the second electrode segment 2311b are at least portions of the positive electrode 231a and the negative electrode 231b, respectively. For example, in... Figure 6 In the diagram, the first electrode segment 2311a is the portion of the positive electrode 231a located in the flat region 23a, and the second electrode segment 2311b is the portion of the negative electrode 231b located in the flat region 23a. If the electrode assembly 23 has a stacked structure, see [reference needed]. Figure 13 As shown, the first electrode segment 2311a is the positive electrode 231a, and the second electrode segment 2311b is the negative electrode 231b.

[0234] The end of the first pole segment 2311a near the wall portion 211 in the thickness direction X of the wall portion does not extend beyond the second pole segment 2311b. That is, the end of the second pole segment 2311b near the wall portion 211 in the thickness direction X of the wall portion is flush with or closer to the wall portion 211 than the end of the first pole segment 2311a near the wall portion 211 in the thickness direction X of the wall portion. For example, see [link to example]. Figure 8 As shown, in order to reduce the risk of metal precipitation during use, the second electrode segment 2311b is a structure that extends beyond the end of the first electrode segment 2311a near the wall 211 in the thickness direction X of the wall.

[0235] The isolation segment 2312 is bent to form an interconnected body portion 23121 and a bent portion 23122. The body portion 23121 is located between two adjacent second pole segments 2311b, and the bent portion 23122 is located on the side of the second pole segment 2311b near the wall portion 211. The bent portions 23122 of two adjacent isolation segments 2312 are stacked. That is, the isolation segment 2312 of the isolation member 231c located in the flat region 23a has a structure formed by bending into two parts. The part of the isolation segment 2312 that is sandwiched between two adjacent pole segments 2311 and located between two adjacent second pole segments 2311b in the first direction Y is the body portion 23121 of the isolation segment 2312. That is, the body portion 23121 and the bent portion One end of 23122 is flush with the end of the second pole segment 2311b near the wall 211 in the thickness direction X of the wall. The structure of the isolation segment 2312 extending beyond the end of the second pole segment 2311b near the wall 211 in the thickness direction X of the wall and being bent and located at the end of the second pole segment 2311b near the wall 211 is the bent part 23122, so that the isolation segment 2312 is bent to form an L-shaped structure. The bent parts 23122 of the multiple isolation segments 2312 in the straight area 23a are located at the end of the multiple second pole segments 2311b facing the wall 211, and the bent parts 23122 of each two adjacent isolation segments 2312 are stacked on each other along the thickness direction X of the wall.

[0236] In this embodiment, the end of the second pole segment 2311b near the wall portion 211 is flush with or longer than the end of the first pole segment 2311a near the wall portion 211. By setting the body portion 23121 between two adjacent second pole segments 2311b and setting the bending portion 23122 on the side of the second pole segment 2311b near the wall portion 211 in the thickness direction X of the wall portion, it is easier to bend the isolation segment 2312, thereby reducing the molding difficulty of the body portion 23121 and the bending portion 23122, and further improving the effect of the isolation segment 2312 in separating two adjacent pole segments 2311, so as to further reduce the risk of overlapping of two adjacent pole segments 2311 at the end near the wall portion 211.

[0237] According to some embodiments of this application, in conjunction with Figure 7 , Figure 8 , Figure 9 and Figure 10 And please combine further Figure 14 and Figure 15 As shown, Figure 14 This is a front view of the isolation segment 2312 of the electrode assembly 23 provided in some embodiments of this application before bending. Figure 15 This is a cross-sectional view of the bent portion 23122 of the isolation section 2312 of the electrode assembly 23 provided in some embodiments of this application. A second groove 23123 is provided on at least one side surface of the isolation section 23122. The second groove 23123 includes a first groove segment 23123a located on the bent portion 23122. The first groove segment 23123a communicates with at least one first groove 222.

[0238] The isolation section 2312 has a second groove 23123 on at least one side of its surface. That is, the isolation section 2312 of the isolation member 231c has a second groove 23123 on at least one side of its surface in the thickness direction. The second groove 23123 can be provided on only one side of its surface or on both sides of its surface.

[0239] The second groove 23123 includes a first groove segment 23123a located on the bend 23122. That is, the second groove 23123 is a structure that is at least partially provided on the bend 23122. Optionally, the second groove 23123 may be provided only on the bend 23122 of the isolation section 2312. Correspondingly, the second groove 23123 as a whole is the first groove segment 23123a. Alternatively, it may be partially provided on the bend 23122 of the isolation section 2312, and another part provided on the body portion 23121 of the isolation section 2312. Correspondingly, the part of the second groove 23123 provided on the bend 23122 is the first groove segment 23123a of the second groove 23123.

[0240] The first groove segment 23123a communicates with the first groove 222, meaning that the first groove segment 23123a of the first groove 222 and the first groove 222 on the support member 22 are interconnected. It should be noted that if the first groove segment 23123a is provided on the surface of the bent portion 23122 facing the support member 22 in the thickness direction X of the wall portion, then the first groove segment 23123a corresponds to the first opening 2211 of at least one first groove 222; if the first groove segment 23123a is provided on the surface of the bent portion 23122 away from the support member 22 in the thickness direction X of the wall portion, then the first groove segment 23123a is a structure that penetrates the end face of the bent portion 23122 away from the body portion 23121, and the end of the first groove segment 23123a penetrating the bent portion 23122 communicates with the first groove 222.

[0241] In this embodiment, a second groove 23123 is provided on at least one side of the surface of the isolation section 2312. The second groove 23123 includes a first groove segment 23123a located on the bend 23122, and the first groove segment 23123a on the bend 23122 communicates with at least one first groove 222. This allows at least a portion of the second groove 23123 to be provided on the bend 23122 and communicate with at least one first groove 222 on the support member 22. Furthermore, the first groove 222 can form a channel for electrolyte passage between the two overlapping bends 23122, thereby facilitating the entry of electrolyte through the first groove 222 of the support member 22 into the first groove segment 2312 of the bend 23122. Within 3a, the electrolyte rises into the interior of the electrode assembly 23 to wet multiple electrode segments 2311. This helps to further reduce the difficulty of the electrolyte entering the electrode assembly 23 from the end near the wall 211, and also helps to further improve the smoothness of the electrolyte entering the interior of the electrode assembly 23. As a result, the battery cell 20 with this structure can further improve the effect of the electrolyte entering the electrode assembly 23 to wet multiple electrode segments 2311, thereby further alleviating the phenomenon of poor electrolyte wetting effect in the electrode assembly 23 during cycle use, and further reducing the risk of metal precipitation in the battery cell 20 during use. This is conducive to further improving the performance and reliability of the battery cell 20.

[0242] According to some embodiments of this application, in conjunction with Figure 5 , Figure 8 , Figure 9 , Figure 14 and Figure 15As shown, along the thickness direction X of the wall portion, the surface of the bent portion 23122 facing the support member 22 is provided with a first groove segment 23123a, and the first groove segment 23123a is correspondingly provided with a first opening 2211 of at least one first groove 222.

[0243] In this design, along the thickness direction X of the wall portion, a first groove segment 23123a is provided on the surface of the bent portion 23122 facing the support member 22. That is, the bent portion 23122 has a first groove segment 23123a on at least one surface facing the support member 22. Alternatively, the first groove segment 23123a can be provided on both sides of the bent portion 23122. The first groove segment 23123a on the surface of the bent portion 23122 facing the support member 22 is a structure that faces at least one first groove 222 in the thickness direction X of the wall portion, so that the groove opening of the first groove segment 23123a can be correspondingly provided with the first opening 2211 of the first groove 222 to connect the first groove segment 23123a and the first groove 222.

[0244] In this embodiment, by providing a first groove segment 23123a on the surface of the bent portion 23122 facing the support member 22, and by providing a structure in which the first groove segment 23123a and the first opening 2211 of at least one first groove 222 are correspondingly provided, the first groove segment 23123a on the bent portion 23122 is arranged to face the first opening 2211 of at least one first groove 222. This facilitates the interconnection between the first groove segment 23123a and at least one first groove 222, and also increases the area of ​​interconnection between the first groove segment 23123a and the first groove 222, thereby improving the smoothness of the electrolyte entering the first groove segment 23123a from the first groove 222.

[0245] According to some embodiments of this application, in conjunction with Figure 5 , Figure 8 , Figure 9 , Figure 11 , Figure 14 and Figure 15 As shown, along the thickness direction X of the wall portion, a first groove segment 23123a is provided on the surface of the bent portion 23122 facing away from the support member 22. The first groove segment 23123a penetrates the end face of the bent portion 23122 away from the body portion 23121 and forms a second opening 23122a, and at least a portion of the second opening 23122a is located in the first groove 222 and communicates with the first groove 222.

[0246] Along the thickness direction X of the wall portion, a first groove segment 23123a is provided on the surface of the bent portion 23122 facing away from the support member 22. That is, the bent portion 23122 has a first groove segment 23123a on at least one side of the surface facing away from the support member 22. Alternatively, the first groove segment 23123a can be provided on both sides of the bent portion 23122. The first groove segment 23123a on the surface of the bent portion 23122 facing away from the support member 22 is a structure that penetrates the end of the bent portion 23122 away from the main body portion 23121. At least a portion of the area of ​​the bent portion 23122 penetrated by the first groove segment 23123a is accommodated in the first groove 222, so that the second opening 23122a formed by the bending portion 23122 penetrated by the first groove segment 23123a can communicate with the first groove 222 to connect the first groove segment 23123a and the first groove 222.

[0247] It should be noted that, in this embodiment of the application, the surfaces on both sides of the bent portion 23122 are provided with a first groove segment 23123a, and correspondingly, the surfaces on both sides of the isolation segment 2312 are provided with a second groove 23123. The first groove segment 23123a provided on the surface of the bent portion 23122 facing the support member 22 is a structure that is directly facing and connected to the first groove 222, and the first groove segment 23123a provided on the surface of the bent portion 23122 away from the support member 22 is a structure that is connected to the first groove 222 through the second opening 23122a.

[0248] In this embodiment, by providing a first groove segment 23123a on the surface of the bent portion 23122 away from the support member 22, and by having at least a portion of the second opening 23122a formed by the first groove segment 23123a penetrating the end face of the bent portion 23122 away from the main body portion 23121 located within the first groove 222, the first groove segment 23123a is configured to communicate with at least one first groove 222 through the second opening 23122a. This facilitates the entry of electrolyte in the first groove 222 into the first groove segment 23123a from the second opening 23122a, thereby reducing the difficulty of the electrolyte in the first groove 222 entering the first groove segment 23123a.

[0249] According to some embodiments of this application, in conjunction with Figure 5 , Figure 8 , Figure 9 , Figure 12 and Figure 15As shown, along the thickness direction X of the wall portion, at least one region of the bent portion 23122 with a first groove segment 23123a passes through the first opening 2211 of at least one first groove 222 and extends into the first groove 222. That is, the region of at least one bent portion 23122 with a first groove segment 23123a is a structure in which at least a portion of the bent portion 23122 is inserted into the first groove 222 along the thickness direction X of the wall portion. If the first groove segment 23123a is provided on the surface of the bent portion 23122 facing the support member 22, then at least a portion of the first groove segment 23123a on the surface of the bent portion 23122 facing the support member 22 is located in the first groove 222; if the first groove segment 23123a is provided on the surface of the bent portion 23122 away from the support member 22, then at least a portion of the region of the bent portion 23122 facing the support member 22 and corresponding to the first groove segment 23123a is located in the first groove 222.

[0250] In this embodiment, by setting the area of ​​the bending portion 23122 with the first groove segment 23123a as a structure that passes through the first opening 2211 of at least one first groove 222 and is inserted into the first groove 222, on the one hand, it facilitates the communication between the first groove 222 and the first groove segment 23123a, thereby further improving the smoothness of the electrolyte entering the first groove segment 23123a in the first groove 222. On the other hand, by making the area of ​​the bending portion 23122 with the first groove segment 23123a be bent or irregular in shape, it is beneficial to expand the size of the channel formed between the two overlapping bending portions 23122 for the electrolyte to pass through, thereby further reducing the difficulty of the electrolyte entering the electrode assembly 23 from the end of the electrode assembly 23 near the wall portion 211.

[0251] In some embodiments, combined with Figure 5 , Figure 8 , Figure 9 , Figure 12 and Figure 15 As shown, along the thickness direction X of the wall portion, at least one bent portion 23122 is bent to form an arc-shaped area 23122b corresponding to the area of ​​the first opening 2211. At least a portion of the arc-shaped area 23122b is located in the first groove 222, and at least a portion of at least one first groove segment 23123a is disposed in the arc-shaped area 23122b.

[0252] Wherein, the arc-shaped region 23122b is the part of the bent portion 23122 that corresponds to the first opening 2211 of the support member 22 in the thickness direction X of the wall portion and is inserted into the first groove 222, so that the bent portion 23122 has a structure that bends towards the wall portion 211 in the thickness direction X of the wall portion, and the arc-shaped region 23122b has a structure that protrudes from the first surface 221 of the support member 22 in the direction towards the wall portion 211. Correspondingly, at least a portion of at least one first groove segment 23123a is provided in the arc-shaped region 23122b, that is, at least a portion of the first groove segment 23123a is provided in at least one arc-shaped region 23122b.

[0253] It should be noted that in the embodiment where the support member 22 is provided with a plurality of first grooves 222 arranged at intervals along the second direction Z and the first grooves 222 extend along the first direction Y, the bent portion 23122 is formed with a plurality of arc-shaped regions 23122b arranged at intervals along the second direction Z, and the arc-shaped regions 23122b are strip structures extending along the first direction Y. Correspondingly, at least a portion of each first groove segment 23123a may be disposed in one arc-shaped region 23122b, or at least a portion of a plurality of first groove segments 23123a may be disposed in one arc-shaped region 23122b.

[0254] In this embodiment, by setting the bent portion 23122 to bend in the area of ​​the first opening 2211 of the corresponding support member 22 to form an arc-shaped area 23122b, the arc-shaped area 23122b is inserted into the first groove 222, and at least a portion of the first groove segment 23123a is disposed in the arc-shaped area 23122b, so that the area of ​​the bent portion 23122 with the first groove segment 23123a is bent and inserted into the first groove 222, thereby further facilitating the communication between the first groove 222 and the first groove segment 23123a, thereby further improving the smoothness of the electrolyte in the first groove 222 entering the first groove segment 23123a, and further expanding the size of the channel formed between the two overlapping bent portions 23122 for the electrolyte to pass through, thereby further reducing the difficulty of the electrolyte entering the electrode assembly 23 from the end near the wall 211.

[0255] According to some embodiments of this application, see Figure 14 and Figure 15 As shown, the first groove segment 23123a extends along the extension direction of the bent portion 23122.

[0256] It should be noted that the extension direction of the bending portion 23122 is the extension trajectory line of the bending portion 23122 from one end connected to the main body portion 23121 to the end away from the main body portion 23121. That is to say, the first groove segment 23123a is a strip-shaped groove structure provided on the bending portion 23122 and extending from the end of the bending portion 23122 connected to the main body portion 23121 to the end of the bending portion 23122 away from the main body portion 23121. If the main body portion 23121 and the bending portion 23122 of the isolation segment 2312 are unfolded along the thickness direction X of the wall, as shown... Figure 14 As shown, the first groove segment 23123a is a strip structure extending along the thickness direction X of the wall.

[0257] In this embodiment, by setting the first groove segment 23123a to extend along the extension direction of the bending portion 23122, the first groove segment 23123a is a strip-shaped structure extending from one end of the bending portion 23122 connected to the body portion 23121 to the end of the bending portion 23122 away from the body portion 23121. The first groove segment 23123a with this structure facilitates the electrolyte to climb towards the body portion 23121 after entering the first groove segment 23123a, thereby facilitating the electrolyte to climb into the interior of the electrode assembly 23 to wet the multiple electrode segments 2311, which is beneficial to further improve the effect of the electrode assembly 23 being wetted by the electrolyte.

[0258] According to some embodiments of this application, in conjunction with Figure 8 , Figure 11 , Figure 14 and Figure 15 As shown, the first groove segment 23123a extends to the end of the bend 23122 away from the main body 23121. That is, the first groove segment 23123a is a structure that penetrates the end face of the bend 23122 away from the main body 23121, and a second opening 23122a is formed on the end face of the bend 23122 away from the main body 23121.

[0259] In this embodiment, by setting the first tank segment 23123a to extend to the end of the bend 23122 away from the main body 23121, the first tank segment 23123a is a structure that penetrates the end face of the bend 23122 away from the main body 23121. This facilitates the entry of electrolyte from the area of ​​the bend 23122 penetrated by the first tank segment 23123a into the first tank segment 23123a, which helps to reduce the difficulty of electrolyte entering the first tank segment 23123a and improves the smoothness of electrolyte entering the first tank segment 23123a.

[0260] According to some embodiments of this application, in conjunction with Figure 4 , Figure 5 , Figure 8 , Figure 9 and Figure 15 As shown, the first groove 222 extends along the first direction Y, and the support member 22 is provided with multiple rows of first grooves 222 arranged at intervals along the second direction Z, and each row of first grooves 222 includes at least one first groove 222. The thickness direction X of the wall portion, the first direction Y, and the second direction Z are perpendicular to each other. In the projection plane perpendicular to the thickness direction X of the wall portion, the orthographic projection of the groove wall surface of the first groove segment 23123a extends along the first direction Y, and at least a portion of the orthographic projection of the groove wall surface of the first groove segment 23123a is located within the orthographic projection of the groove wall surface of a row of first grooves 222. That is, the extension direction of the projection of the first groove segment 23123a provided on the bending portion 23122 in the thickness direction X of the wall portion is consistent with the extension direction of the first groove 222, and the projection of the first groove segment 23123a in the thickness direction X of the wall portion is correspondingly provided with and at least partially located within the first grooves 222 of the same row.

[0261] For example, in the embodiments of this application, each first groove segment 23123a located on the same side of the bend 23122 is provided in a one-to-one correspondence with a row of first grooves 222 in the thickness direction X of the wall.

[0262] In this embodiment, by setting the orthographic projection of the wall surface of the first groove segment 23123a in the projection plane perpendicular to the thickness direction X of the wall portion as extending along the first direction Y, and at least a portion of the orthographic projection of the wall surface of the first groove segment 23123a in the projection plane perpendicular to the thickness direction X of the wall portion is located within the orthographic projection of the wall surface of a column of first grooves 222 in the projection plane perpendicular to the thickness direction X of the wall portion, the length direction of the first groove segment 23123a is consistent with the length direction of the first groove 222, and the first groove segment 23123a is correspondingly arranged with the first groove 222 in the same column in the first direction Y, it is possible to further facilitate the entry of electrolyte into the first groove segment 23123a after the first groove 222 and the first groove segment 23123a are connected, which is beneficial to further reduce the difficulty of electrolyte entering the first groove segment 23123a and further improve the smoothness of electrolyte entering the first groove segment 23123a.

[0263] According to some embodiments of this application, in conjunction with Figure 8 and Figure 14 As shown, the second groove 23123 also includes a second groove segment 23123b located on the body portion 23121, and the second groove segment 23123b communicates with the first groove segment 23123a. That is, the second groove 23123 has a structure in which part of it is provided on the bent portion 23122 and another part is provided on the body portion 23121.

[0264] In this embodiment, the second groove 23123 further includes a second groove segment 23123b located on the body portion 23121, and the second groove segment 23123b and the first groove segment 23123a are interconnected, so that the second groove 23123 is partially disposed on the bent portion 23122 and the other part is disposed on the body portion 23121. The electrode assembly 23 with this structure is convenient for the electrolyte in the first groove segment 23123a to enter the second groove segment 23123b and then climb to the interior of the electrode assembly 23 and wet the multiple electrode segments 2311, which is beneficial to further improve the effect of the electrode assembly 23 being wetted by the electrolyte.

[0265] In some embodiments, please continue to combine Figure 8 and Figure 14 As shown, the second groove segment 23123b extends along the thickness direction X of the wall.

[0266] For example, the second groove segment 23123b is a strip structure extending along the thickness direction X of the wall portion, and the end of the second groove segment 23123b near the wall portion 211 in the thickness direction X of the wall portion is a structure that is interconnected with the first groove segment 23123a.

[0267] In this embodiment, by setting the second tank segment 23123b to extend along the thickness direction X of the wall, the electrolyte in the first tank segment 23123a enters the second tank segment 23123b and then climbs along the thickness direction X of the wall. This reduces the difficulty of the electrolyte climbing along the thickness direction X of the wall, thereby facilitating the electrolyte to climb into the interior of the electrode assembly 23 and wet the multiple electrode segments 2311, which further improves the effect of the electrode assembly 23 being wetted by the electrolyte.

[0268] In some embodiments, see Figure 14 As shown, the second groove segment 23123b extends to the end of the main body 23121 away from the bend 23122. That is, the second groove segment 23123b is a structure that penetrates the end face of the main body 23121 away from the bend 23122.

[0269] In this embodiment, by setting the second groove segment 23123b to extend to the end of the body portion 23121 away from the bending portion 23122, the second groove segment 23123b is a structure that penetrates the end face of the body portion 23121 away from the wall portion 211. This facilitates the processing of the second groove 23123 from the end of the body portion 23121 away from the bending portion 23122, which helps to reduce the difficulty of setting the second groove 23123 on the isolation segment 2312.

[0270] In some embodiments, combined with Figure 14 and Figure 15As shown, the area of ​​the cross-section of the first groove segment 23123a perpendicular to its extension direction can be greater than the area of ​​the cross-section of the second groove segment 23123b perpendicular to its extension direction.

[0271] It should be noted that the cross-sectional area of ​​the first groove segment 23123a perpendicular to its extension direction is greater than the cross-sectional area of ​​the second groove segment 23123b perpendicular to its extension direction. If the groove width of the first groove segment 23123a is the same as the groove width of the second groove segment 23123b, then the groove depth of the first groove segment 23123a can be greater than the groove depth of the second groove segment 23123b. If the groove depth of the first groove segment 23123a is the same as the groove depth of the second groove segment 23123b, then the groove width of the first groove segment 23123a can be greater than the groove width of the second groove segment 23123b. Of course, it is also possible that the groove depth of the first groove segment 23123a is greater than the groove depth of the second groove segment 23123b and the groove width of the first groove segment 23123a is greater than the groove width of the second groove segment 23123b.

[0272] In this embodiment, by setting the cross-sectional area of ​​the first tank segment 23123a to be larger than the cross-sectional area of ​​the second tank segment 23123b, on the one hand, it is easier for the electrolyte to enter the first tank segment 23123a, which helps to reduce the difficulty of the electrolyte entering the first tank segment 23123a; on the other hand, it is easier for the electrolyte to climb into the interior of the electrode assembly 23 in the second tank segment 23123b due to the effect of capillary action, so as to wet the multiple electrode segments 2311, which helps to improve the effect of the electrode assembly 23 being wetted by the electrolyte.

[0273] According to some embodiments of this application, see Figure 14 and Figure 15 As shown, a plurality of second grooves 23123 are provided on at least one side of the surface of the isolation section 2312, and the plurality of second grooves 23123 are arranged at intervals along the second direction Z, and the thickness direction X, the first direction Y and the second direction Z of the wall are perpendicular to each other.

[0274] The isolation section 2312 has a plurality of second grooves 23123 on at least one side of its surface. That is, the isolation section 2312 may have a plurality of second grooves 23123 on only one side of its surface, or it may have a plurality of second grooves 23123 on both sides of its surface. The plurality of second grooves 23123 on the same side of the isolation section 2312 are arranged at intervals along the second direction Z. Correspondingly, a plurality of first groove segments 23123a are formed on the same side of the bent portion 23122 and arranged at intervals along the second direction Z. A plurality of second groove segments 23123b are formed on the same side of the main body portion 23121 and arranged at intervals along the second direction Z. Each second groove segment 23123b is connected to a first groove segment 23123a.

[0275] For example, in the embodiments of this application, a plurality of second grooves 23123 are provided on both sides of the isolation segment 2312.

[0276] In this embodiment, by providing a plurality of second grooves 23123 arranged at intervals along the second direction Z on the surface of at least one side of the isolation section 2312, a plurality of first groove segments 23123a arranged at intervals along the second direction Z are provided on the bent portion 23122. This can, on the one hand, further increase the number and space of channels for electrolyte passage formed between the two overlapping bent portions 23122, and on the other hand, enable the electrolyte to enter the multiple bent portions 23122 from the first groove segments 23123a at different positions of the bent portion 23122 and then enter the electrode assembly 23, which is beneficial to increase the path for electrolyte flow and further improve the wetting effect of electrolyte on the electrode assembly 23.

[0277] According to some embodiments of this application, see Figure 15 As shown, the isolation section 2312 includes a base film 2312a and a coating 2312b. The base film 2312a has a coating 2312b on at least one side in its thickness direction. The coating 2312b has a porous structure, and a second groove 23123 is disposed on the coating 2312b.

[0278] The base film 2312a is an isolation segment 2312, which mainly serves to insulate and isolate two adjacent pole segments 2311. For example, the base film 2312a can be made of polyethylene, polypropylene, or polyimide, etc.

[0279] The coating 2312b has a porous structure, which enables it to absorb and retain electrolyte, giving the isolation section 2312 good liquid absorption and retention capabilities. This allows the isolation section 2312 to guide the electrolyte into the electrode assembly 23 and wet the multiple electrode segments 2311.

[0280] For example, in Figure 15 In this embodiment, the base film 2312a has a coating 2312b on both sides of its thickness direction. It should be noted that in the embodiment where the second groove 23123 is provided on both sides of the isolation section 2312 and the second groove 23123 is provided on the coating 2312b, then the base film 2312a has a coating 2312b on both sides.

[0281] For example, the material of coating 2312b can be ceramic, such as metal oxide ceramic or silicon carbide ceramic, that is, coating 2312b is ceramic coating 2312b. Of course, the material of coating 2312b can also be a mixture of ceramic and polycarbonate.

[0282] In this embodiment, the isolation segment 2312 includes a base film 2312a and a coating 2312b disposed on the base film 2312a. By disposing the second groove 23123 on the isolation segment 2312 onto the coating 2312b of the isolation segment 2312, it is beneficial to reduce the difficulty of forming the second groove 23123 on the isolation segment 2312 and to alleviate the phenomenon that the structural strength of the isolation segment 2312 is excessively weakened by the second groove 23123.

[0283] In some embodiments, please continue to see Figure 15 As shown, the depth of the second groove 23123 is less than the thickness of the coating 2312b. That is, the second groove 23123 does not penetrate the entire coating 2312b in the thickness direction, so that the bottom surface of the second groove 23123 and the base film 2312a are spaced apart.

[0284] In this embodiment, by setting the groove depth of the second groove 23123 to be less than the thickness of the coating 2312b, the second groove 23123 is a structure that does not penetrate the entire coating 2312b in the thickness direction of the coating 2312b. This allows the base film 2312a to also have a portion of the coating 2312b between the bottom surface of the groove and the second groove 23123. Thus, the coating 2312b can provide a certain degree of separation and protection for the base film 2312a, reducing the risk of the area of ​​the base film 2312a corresponding to the second groove 23123 being punctured. This can alleviate the risk of internal short circuit in the electrode assembly 23 caused by the puncture of the base film 2312a.

[0285] 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. For example, along the thickness direction of the coating 2312b, the second groove 23123 penetrates the coating 2312b. That is, the area of ​​the base film 2312a corresponding to the second groove 23123 is an exposed structure.

[0286] In this embodiment, by setting the second groove 23123 to penetrate the coating 2312b in the thickness direction of the coating 2312b, the difficulty of setting the second groove 23123 on the coating 2312b can be reduced. The second groove 23123 can be formed on the coating 2312b by simply using an intermittent coating process. On the other hand, the depth of the second groove 23123 can be further increased so as to further increase the space between the two overlapping bends 23122 to form a channel for electrolyte to pass through and store electrolyte.

[0287] According to some embodiments of this application, see Figure 9 and Figure 10As shown, the first groove 222 extends along the first direction Y, that is, the first groove 222 is a strip-shaped groove structure extending along the first direction Y.

[0288] In this embodiment, by setting the first groove 222 to extend along the first direction Y, the extension direction of the first groove 222 is parallel to the stacking direction of the multiple electrode segments 2311, which facilitates the electrolyte contained in the first groove 222 to wet the multiple electrode segments 2311, which is beneficial to improve the overall wetting effect of the electrode assembly 23, thereby improving the performance and reliability of the battery cell 20.

[0289] In some embodiments, combined with Figure 5 , Figure 6 and Figure 9 As shown, at least one first groove 222 spans at least two adjacent pole segments 2311 along the first direction Y. That is, the projections of two or more adjacent pole segments 2311 in the thickness direction X of the wall are located within the same first groove 222. Correspondingly, the extension dimension of one or more first grooves 222 in the first direction Y is greater than the thickness of the stacked and adjacent pole segments 2311.

[0290] In this embodiment, by setting at least one first groove 222 to span at least two adjacent electrode segments 2311 along the first direction Y, the at least one first groove 222 is configured to correspond to at least two electrode segments 2311 in the thickness direction X of the wall, thereby facilitating the wetting of multiple electrode segments 2311 by the electrolyte contained in the first groove 222, which is beneficial to further improve the overall wetting effect of the electrode assembly 23.

[0291] In some embodiments, combined with Figure 8 , Figure 9 , Figure 10 and Figure 11 As shown, the extension length of the first groove 222 in the first direction Y is greater than the maximum dimension of the bent portion 23122 in the first direction Y.

[0292] Wherein, the extension length of the first groove 222 in the first direction Y is the maximum length dimension of the first groove 222 in the first direction Y, and the maximum dimension of the bent portion 23122 in the first direction Y is the maximum distance in the first direction Y between one end of the bent portion 23122 connected to the body portion 23121 and the end of the bent portion 23122 away from the body portion 23121.

[0293] In this embodiment, by setting the length of the first groove 222 in the first direction Y to be greater than the maximum size of the bent portion 23122 in the first direction Y, the phenomenon of the bent portion 23122 covering the first groove 222 is reduced. This facilitates the bent portion 23122 passing through the first opening 2211 of the first groove 222 and extending into the first groove 222, reducing the difficulty of inserting the bent portion 23122 into the first groove 222. On the other hand, it can improve the contact effect between the bent portion 23122 and the electrolyte in the first groove 222, and reduce the obstruction of the first groove 222 by a single bent portion 23122. This allows the electrolyte to climb into the interior of the electrode assembly 23 through the bent portion 23122 and the gaps between the stacked bent portions 23122 and wet the multiple electrode segments 2311, which helps to improve the smoothness of the electrolyte entering the interior of the electrode assembly 23, thereby improving the wetting effect of the electrolyte on the electrode assembly 23.

[0294] According to some embodiments of this application, see Figure 9 and Figure 10 As shown, the support member 22 is provided with multiple rows of first grooves 222 arranged at intervals along the second direction Z, and each row of first grooves 222 includes at least one first groove 222. The thickness direction X of the wall, the first direction Y, and the second direction Z are perpendicular to each other. That is, the multiple first grooves 222 provided on the support member 22 are arranged in a structure along the first direction Y and the second direction Z, so that the support member 22 is provided with multiple rows of first grooves 222 arranged at intervals along the second direction Z, and each row of first grooves 222 includes at least one first groove 222 arranged along the first direction Y.

[0295] For example, in Figure 10 In the support member 22, a plurality of first grooves 222 are provided on the first surface 221 of the support member 22, which are arranged at intervals along the second direction Z, and each column of first grooves 222 includes a plurality of first grooves 222 arranged at intervals along the first direction Y.

[0296] In this embodiment, by providing multiple rows of first grooves 222 arranged at intervals along the second direction Z on the support member 22, and each row of first grooves 222 including at least one first groove 222 extending along the first direction Y, the multiple first grooves 222 on the support member 22 can be correspondingly arranged with more electrode segments 2311 in the thickness direction X of the wall, thereby facilitating the electrolyte contained in the first grooves 222 to wet the multiple electrode segments 2311, which is beneficial to further improve the overall wetting effect of the electrode assembly 23.

[0297] According to some embodiments of this application, see Figure 9 and Figure 10As shown, the support member 22 has a first surface 221 facing the electrode assembly 23 and a second surface 223 facing away from the electrode assembly 23 in the thickness direction X of the wall portion. A first groove 222 penetrates the first surface 221 and forms a first opening 2211. The support member 22 also has an outer peripheral surface 224, which connects the first surface 221 and the second surface 223. At least one end of the first groove 222 in the first direction Y penetrates the outer peripheral surface 224 and forms a third opening 2243.

[0298] The first surface 221 is the side of the support member 22 facing the wall portion 211 in the thickness direction X of the wall portion, and the side of the support member 22 facing the wall portion 211 in the thickness direction X of the wall portion. Correspondingly, the outer peripheral surface 224 is the side of the support member 22 that extends circumferentially along the support member 22 and connects the first surface 221 and the second surface 223.

[0299] The first groove 222 penetrates the first surface 221 and forms the first opening 2211. That is, the first groove 222 extends to the first surface 221 along the thickness direction X of the wall, and the area of ​​the first surface 221 penetrated by the first groove 222 forms the first opening 2211 of the first groove 222.

[0300] At least one first groove 222 extends through at least one end of the outer peripheral surface 224 in the first direction Y and forms a third opening 2243. That is, at least one first groove 222 is a structure that extends along the first direction Y and at least one end extends onto the outer peripheral surface 224, so that the area of ​​the outer peripheral surface 224 penetrated by the first groove 222 forms the third opening 2243. For example, in Figure 10 In this embodiment, only one end of the first groove 222 in the first direction Y penetrates the outer peripheral surface 224. Of course, in other embodiments, the first groove 222 may also have a structure in which both ends in the first direction Y penetrate the outer peripheral surface 224.

[0301] In this embodiment, by setting at least one first groove 222 to penetrate the outer peripheral surface 224 of the support member 22 in the first direction Y, the electrolyte can also enter the first groove 222 from the third opening 2243, thereby reducing the difficulty of the electrolyte entering the first groove 222 and improving the smoothness of the electrolyte entering the first groove 222, thereby further improving the wetting effect of the electrolyte on the end of the electrode assembly 23 near the wall 211.

[0302] According to some embodiments of this application, please continue to refer to Figure 9 and Figure 10As shown, the support member 22 includes a plurality of support portions 225 and at least one connecting portion 226. The plurality of support portions 225 are arranged at intervals along the second direction Z, and every two adjacent support portions 225 are connected by the connecting portion 226. 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 first groove 222 is formed between every two adjacent support portions 225.

[0303] Along the second direction Z, at least one first groove 222 is formed between every two adjacent support portions 225. That is, there may be only one first groove 222 between two adjacent support portions 225, or there may be multiple first grooves 222. For example, in Figure 9 In this embodiment, each pair of adjacent support portions 225 is connected by a connecting portion 226, and the two ends of the connecting portion 226 are respectively connected to the middle of the two adjacent support portions 225, so that two first grooves 222 are formed between the two adjacent support portions 225 on both sides of the corresponding connecting portion 226 in the first direction Y. Of course, in other embodiments, the connecting portion 226 may also have its two ends connected to the ends of the two adjacent support portions 225, so that only one first groove 222 is formed between the two adjacent support portions 225. Similarly, multiple connections arranged at intervals along the first direction Y may also be connected between the two adjacent support portions 225, so that multiple first grooves 222 arranged at intervals along the first direction Y are formed between the two adjacent support portions 225.

[0304] For example, the connecting portion 226 is a structure that extends along the second direction Z.

[0305] In this embodiment, the support member 22 is provided with a plurality of support portions 225 arranged at intervals along the second direction Z, and each pair of adjacent support portions 225 are connected by a connecting portion 226, so that at least one first groove 222 can be formed between the two adjacent support portions 225. The support member 22 with this structure is convenient to form the first groove 222 on the support member 22, which is simple in structure and easy to manufacture. On the other hand, it allows the electrolyte to enter the first groove 222 from at least one end of the support member 22 in the first direction Y, and then climb up to the electrode assembly 23 through the first groove segment 23123a on the bending portion 23122 and wet the multiple electrode segments 2311. This helps to increase the path of the electrolyte into the electrode assembly 23, thereby further reducing the difficulty of the electrolyte wetting the end of the electrode assembly 23 near the wall portion 211, so as to further improve the overall wetting effect of the electrode assembly 23.

[0306] In some embodiments, see Figure 10As shown, the two ends of the connecting part 226 are respectively connected to the middle of two adjacent support parts 225, and two first grooves 222 are formed between the two adjacent support parts 225. The two first grooves 222 are respectively located on both sides of the connecting part 226 in the first direction Y.

[0307] Correspondingly, the first grooves 222 located on both sides of the same connecting part 226 in the first direction Y have a structure in which one end of the support member 22 in the first direction Y passes through only one side of the support member 22 in the first direction Y.

[0308] It should be noted that the dimensions of the first grooves 222 on both sides of the same connecting portion 226 in the first direction Y can be the same or different in the first direction Y. For example, in Figure 10 In the first groove 222 located on both sides of the same connecting part 226 in the first direction Y have different dimensions in the first direction Y.

[0309] In this embodiment, by connecting the two ends of the connecting portion 226 to the middle positions of two adjacent support portions 225, two first grooves 222 are formed between the two adjacent support portions 225 at intervals along the first direction Y. This allows the electrolyte to enter the corresponding first grooves 222 from the two ends of the support member 22 in the first direction Y, and then climb up to the electrode assembly 23 through the first groove segment 23123a on the bending portion 23122 and wet the multiple electrode segments 2311. This further increases the path for the electrolyte to enter the electrode assembly 23.

[0310] According to some embodiments of this application, please refer to Figure 9 and Figure 10 As shown, along the first direction Y, the outer peripheral surface 224 includes a first side surface 2241 and a second side surface 2242 disposed opposite to each other, and the distance between at least one connecting portion 226 and the first side surface 2241 and the distance between it and the second side surface 2242 are not equal.

[0311] The support member 22 has a rectangular structure in the orthographic projection of the wall portion in the thickness direction X. Correspondingly, the support member 22 has two oppositely arranged sides in the first direction Y, namely the first side 2241 and the second side 2242.

[0312] At least one connecting portion 226 has a distance between itself and the first side surface 2241 that is not equal to the distance between itself and the second side surface 2242. That is, in the same connecting portion 226, the distance between the connecting portion 226 and the first side surface 2241 in the first direction Y is not equal to the distance between the connecting portion 226 and the second side surface 2242 in the first direction Y.

[0313] For example, in Figure 10In the support member 22, there are multiple connecting portions 226. The multiple connecting portions 226 include a first connecting portion 2261 and a second connecting portion 2262 that are adjacent to each other in the second direction Z. The first connecting portion 2261 and the second connecting portion 2262 are arranged at intervals in the first direction Y. Correspondingly, the distance between the first connecting portion 2261 and the first side surface 2241 in the first direction Y is greater than the distance between the first connecting portion 2261 and the second side surface 2242 in the first direction Y. Conversely, the distance between the second connecting portion 2262 and the first side surface 2241 in the first direction Y is less than the distance between the second connecting portion 2262 and the second side surface 2242 in the first direction Y.

[0314] In this embodiment, by setting the distance between at least one connecting portion 226 and the first side surface 2241 and the distance between it and the second side surface 2242 to be unequal, at least one connecting portion 226 is set at a position offset from the middle position of the support member 22 in the first direction Y, so that the first groove 222 can extend to the middle position of the support member 22 in the first direction Y, thereby facilitating the supply of electrolyte to the middle position of the electrode assembly 23 in the first direction Y within the battery cell 20, which is beneficial to improving the effect of the electrode assembly 23 being wetted by the electrolyte.

[0315] According to some embodiments of this application, see Figure 10 As shown, the support member 22 may include a plurality of connecting portions 226, each of which includes at least one first connecting portion 2261 and at least one second connecting portion 2262. Along the first direction Y, the outer peripheral surface 224 includes a first side surface 2241 and a second side surface 2242 disposed opposite to each other, and the distance between each first connecting portion 2261 and the first side surface 2241 and the distance between each second connecting portion 2262 and the first side surface 2241 are not equal.

[0316] Along the first direction Y, the distance between each first connecting part 2261 and the first side surface 2241 is greater than the distance between each second connecting part 2262 and the first side surface 2241. Conversely, along the first direction Y, the distance between each first connecting part 2261 and the second side surface 2242 is less than the distance between each second connecting part 2262 and the second side surface 2242. That is, in the first direction Y, the first connecting part 2261 is closer to the first side surface 2241 than the second connecting part 2262, and the first connecting part 2261 is farther away from the second side surface 2242 than the second connecting part 2262.

[0317] In this embodiment, by setting the distance between each first connecting part 2261 and the first side surface 2241 and the distance between each second connecting part 2262 and the first side surface 2241 to be unequal, the first connecting parts 2261 and the second connecting parts 2262 are arranged in a staggered manner in the second direction Z. This can disperse the pressure of the electrode assembly 23 on the support member 22, which helps to reduce the stress concentration phenomenon in the support member 22 and improve the structural strength of the support member 22, thereby reducing the risk of breakage or deformation of the support member 22 during use.

[0318] In some embodiments, see Figure 10 As shown, the support member 22 has a central axis (not shown) that is parallel to the second direction Z. At least one first connecting portion 2261 is located on one side of the central axis in the first direction Y, and at least one second connecting portion 2262 is located on the other side of the central axis in the first direction Y.

[0319] The central axis of the support member 22 is a straight line extending along the second direction Z, and the orthographic projection of the support member 22 in the thickness direction X perpendicular to the wall portion is a structure arranged symmetrically about the central axis of the support member 22.

[0320] At least one first connecting portion 2261 is located on one side of the central axis in the first direction Y, and at least one second connecting portion 2262 is located on the other side of the central axis in the first direction Y. That is, at least one first connecting portion 2261 and at least one second connecting portion 2262 are respectively located on both sides of the central axis in the first direction Y. For example, all first connecting portions 2261 are located on one side of the central axis in the first direction Y, and all second connecting portions 2262 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 2261 and the central axis is equal to the distance between the second connecting portion 2262 and the central axis.

[0321] In this embodiment, by setting the first connecting part 2261 and the second connecting part 2262 to be located on both sides of the central axis of the support member 22 in the first direction Y, the opposite sides of the support member 22 along the first direction Y have good structural strength, which can better disperse the pressure of the electrode assembly 23 on the support member 22, thereby reducing the stress concentration phenomenon of the support member 22 during use and reducing the risk of deformation of the support member 22, thereby improving the reliability of the support member 22.

[0322] In some embodiments, please continue to see Figure 10 As shown, there are multiple first connecting portions 2261 and second connecting portions 2262, and the first connecting portions 2261 and second connecting portions 2262 are alternately arranged along the second direction Z.

[0323] In this embodiment, by setting the first connecting part 2261 and the second connecting part 2262 to be arranged alternately along the second direction Z, each pair of adjacent connecting parts 226 in the plurality of connecting parts 226 are staggered in the second direction Z, thereby effectively improving the structural strength of the support member 22, which is beneficial to reducing the stress concentration phenomenon of the support member 22 during use, and can reduce the deformation risk of the support member 22.

[0324] In some embodiments, please continue to see Figure 10 As shown, there are multiple first connecting parts 2261, which are arranged along the second direction Z and all located on the same straight line. That is, the multiple first connecting parts 2261 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 2261 coincide.

[0325] In this embodiment, by setting the multiple first connecting parts 2261 to be arranged along the second direction Z and all located on the same straight line, the arrangement of the multiple first connecting parts 2261 is regular, which helps to reduce the processing difficulty of the support member 22 and can better disperse the pressure of the electrode assembly 23 on the support member 22, so as to reduce the stress concentration phenomenon of the support member 22 during use and reduce the risk of deformation of the support member 22.

[0326] In some embodiments, please continue to see Figure 10 As shown, there are multiple second connecting portions 2262, which are arranged along the second direction Z and all located on the same straight line. That is, the multiple second connecting portions 2262 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 2262 coincide.

[0327] In this embodiment, by setting the multiple second connecting parts 2262 to be arranged along the second direction Z and all located on the same straight line, the arrangement of the multiple second connecting parts 2262 is regular, which helps to reduce the processing difficulty of the support member 22 and can better disperse the pressure of the electrode assembly 23 on the support member 22, so as to reduce the stress concentration phenomenon of the support member 22 during use and reduce the risk of deformation of the support member 22.

[0328] According to some embodiments of this application, see Figure 9 , Figure 10 and Figure 12As shown, the support member 22 has a first surface 221 facing the electrode assembly 23 and a second surface 223 facing away from the electrode assembly 23 in the thickness direction X of the wall portion. A first groove 222 penetrates the first surface 221 and forms a first opening 2211. Along the thickness direction X of the wall portion, at least one first groove 222 penetrates the second surface 223 and forms a fourth opening 2231. That is, the first groove 222 provided on the support member 22 has a structure that extends to the second surface 223 on the side of the support member 22 facing away from the electrode assembly 23, so that the area of ​​the second surface 223 penetrated by the first groove 222 forms the fourth opening 2231. Correspondingly, the first groove 222 has a structure that penetrates the entire support member 22 along the thickness direction X of the wall portion.

[0329] It should be noted that in the embodiment where the first groove 222 penetrates the second surface 223 along the thickness direction X of the wall, the first groove 222 can only be a structure in the first direction Y that penetrates the outer peripheral surface 224 of the support member 22 at one end. If the first groove 222 is a structure that does not penetrate the second surface 223 in the thickness direction X of the wall, then the first groove 222 can be a structure in the first direction Y that penetrates the outer peripheral surface 224 of the support member 22 at both ends.

[0330] In this embodiment, by configuring at least one first groove 222 to penetrate the second surface 223 of the support member 22 away from the electrode assembly 23, the first groove 222 is configured to penetrate the entire support member 22 along the thickness direction X of the wall. This improves the electrolyte buffering capacity of the first groove 222, thereby increasing its storage capacity. It also facilitates the entry of electrolyte from the side of the support member 22 away from the electrode assembly 23 into the first groove 222, and then through the first groove segment 23123a on the bend 23122 to the electrode assembly 23 to wet the multiple electrode segments 2311. This reduces the difficulty of electrolyte entering the first groove 222, further reducing the difficulty of electrolyte wetting the end of the electrode assembly 23 near the wall 211, thereby further improving the overall wetting effect of the electrode assembly 23.

[0331] According to some embodiments of this application, see Figure 9 and Figure 10 As shown, the support member 22 may be provided with a positioning hole 227. The positioning hole 227 penetrates the support member 22 along the thickness direction X of the wall, and the positioning hole 227 and the first groove 222 are not connected.

[0332] The positioning hole 227 and the first groove 222 are not connected. That is, in the projection plane perpendicular to the thickness direction X of the wall, the orthographic projection of the hole wall of the positioning hole 227 and the orthographic projection of the groove side of the first groove 222 do not overlap.

[0333] It should be noted that the positioning hole 227 plays a positioning role for the support member 22 during the assembly or processing of the support member 22. The positioning hole 227 has a structure in which the two ends of the support member 22 penetrate the first surface 221 and the second surface 223 of the support member 22 respectively in the thickness direction X of the wall, and the positioning hole 227 does not penetrate the outer peripheral surface 224 of the support member 22.

[0334] For example, the support member 22 is provided with two positioning holes 227, which are arranged at intervals along the second direction Z, and one of the positioning holes 227 is a round hole and the other positioning hole 227 is an oblong hole.

[0335] In this embodiment, the support member 22 is also provided with a positioning hole 227, which can be used to position the support member 22. On the one hand, it can improve the assembly accuracy of the support member 22 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 first groove 222 on the support member 22, thereby improving the production quality of the support member 22. In particular, by setting the positioning hole 227 and the first groove 222 to be non-communicating, the interference effect of the first groove 222 on the positioning hole 227 during use can be reduced, and the phenomenon of reduced structural strength of the support member 22 can be reduced.

[0336] According to some embodiments of this application, in conjunction with Figure 4 , Figure 5 and Figure 14 As shown, along the thickness direction X of the wall portion, the electrode assembly 23 directly abuts against the first surface 221 of the support member 22. That is, the electrode assembly 23 and the first surface 221 of the support member 22 are in direct contact, so that the bent portion 23122 of the electrode assembly 23 directly abuts against the first surface 221 of the support member 22.

[0337] In this embodiment, by setting the electrode assembly 23 and the support member 22 to a direct contact structure, the difficulty of communicating between the first groove 222 on the support member 22 and the first groove segment 23123a on the bent portion 23122 can be reduced. It also facilitates the electrolyte contained in the first groove 222 to directly enter the first groove segment 23123a and then climb to the interior of the electrode assembly 23. This further reduces the difficulty of the end of the electrode assembly 23 near the wall 211 being wetted by the electrolyte, thereby further improving the wetting effect of the electrolyte on the electrode assembly 23.

[0338] According to some embodiments of this application, in conjunction with Figure 4 and Figure 5As shown, the battery cell 20 may further include an insulating member 27, which covers the outside of the electrode assembly 23, and the insulating member 27 includes an insulating portion 271 located between the wall portion 211 and the electrode assembly 23. Along the thickness direction X of the wall portion, the support member 22 is located between the insulating portion 271 and the electrode assembly 23.

[0339] Among them, the insulating portion 271 of the insulating member 27 is the part of the insulating member 27 located between the wall portion 211 and the electrode assembly 23 in the thickness direction X of the wall portion. Correspondingly, along the thickness direction X of the wall portion, the support member 22 is located between the insulating portion 271 and the electrode assembly 23. That is, the support member 22 is located on the side of the insulating portion 271 of the insulating member 27 facing the electrode assembly 23 in the thickness direction X of the wall portion, so that the support member 22 is also a structure located inside the insulating member 27.

[0340] In this embodiment, by covering the outside of the electrode assembly 23 with an insulating member 27, the insulating member 27 can effectively insulate and isolate the electrode assembly 23 and the outer casing 21, which helps to reduce the risk of short circuit between the electrode assembly 23 and the outer casing 21. Furthermore, by configuring the support member 22 as a structure located between the electrode assembly 23 and the insulating portion 271 of the insulating member 27, the support member 22 is positioned inside the insulating member 27. This structure in the battery cell 20 allows the support member 22 to act as a separator between the insulating member 27 and the electrode assembly 23, thus mitigating the risk of short circuit. After the insulating part 271 is tightly attached or pressed against the electrode assembly 23, it becomes more difficult for the electrolyte to enter the interior of the multiple electrode segments 2311 through the multiple bends 23122. On the other hand, it facilitates direct contact between the bends 23122 and the support member 22, so that the electrolyte contained in the first groove 222 can directly enter the first tank segment 23123a and then climb into the interior of the electrode assembly 23. This helps to further reduce the difficulty of the end of the electrode assembly 23 near the wall 211 being wetted by the electrolyte, thereby further improving the wetting effect of the electrolyte on the electrode assembly 23.

[0341] In some embodiments, see Figure 4 As shown, the support member 22 and the insulating part 271 are separate components. That is, the support member 22 and the insulating part 271 of the insulating member 27 are two independent parts. Correspondingly, the support member 22 and the insulating part 271 can be fixedly connected, such as by bonding, or they can not be fixedly connected and are only in abutting structure.

[0342] In this embodiment, by setting the support member 22 and the insulating part 271 of the insulating member 27 as separate structures, it is beneficial to reduce the difficulty of setting the support member 22 between the insulating part 271 and the electrode assembly 23, thereby reducing the assembly difficulty of the battery cell 20, and also reducing the difficulty of setting the first groove 222 on the side of the support member 22 facing the electrode assembly 23, thereby reducing the molding difficulty of the support member 22.

[0343] 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 22 and the insulating part 271 being integrally formed. That is, the support member 22 and the insulating part 271 are structures formed by an integral forming process, such as extrusion molding or injection molding. Correspondingly, the support member 22 is a protruding structure on the side of the insulating part 271 facing the electrode assembly 23.

[0344] In this embodiment, by setting the insulating portion 271 of the support member 22 and the insulating member 27 as an integrally formed structure, it is beneficial to improve the overall structural stability between the support member 22 and the insulating member 27, so as to improve the supporting effect of the support member 22 on the electrode assembly 23, and reduce the risk of the support member 22 shifting or displacing between the insulating portion 271 and the electrode assembly 23 during use.

[0345] 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.

[0346] 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.

[0347] 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.

[0348] 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.

[0349] 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 2In the middle, box 10 has a rectangular structure.

[0350] 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.

[0351] 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.

[0352] 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.

[0353] 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.

[0354] The electrical device can be any of the aforementioned devices or systems that utilize battery cells 20.

[0355] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0356] 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 by, 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 comprising 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 isolation segment is bent to form an interconnected body portion and a bent portion. The body portion is located between two adjacent electrode segments, and the bent portion is located on the side of the electrode segment closer to the wall portion. The bent portions of two adjacent isolation segments are stacked. The thickness direction of the wall portion is perpendicular to the first direction. A support member is disposed between the electrode assembly and the wall portion in the thickness direction of the wall portion, and the support member is configured to support the electrode assembly. The support member is provided with at least one first groove, and the first groove has a first opening facing the bend in the thickness direction of the wall portion. At least one of the bend portions passes through the first opening of at least one first groove and extends into the first groove.

2. The battery cell of claim 1, wherein, Along the thickness direction of the wall portion, a plurality of the bent portions pass through the first opening of the same first groove and extend into the first groove.

3. The battery cell of claim 1, wherein, The support member is provided with a plurality of first grooves, and along the thickness direction of the wall portion, at least one of the bent portions passes through the first opening of the plurality of first grooves and extends into the plurality of first grooves.

4. The battery cell of claim 3, wherein, The first groove extends along the first direction, and the support member is provided with multiple rows of first grooves arranged at intervals along the second direction, and each row of first grooves includes at least one first groove. The thickness direction of the wall, the first direction and the second direction are perpendicular to each other. Along the thickness direction of the wall portion, the bent portion is disposed opposite to a plurality of first grooves, and the multiple regions of the bent portion in the second direction respectively pass through the first opening of the corresponding first groove and extend into the corresponding first groove.

5. The battery cell of claim 1, wherein, Along the thickness direction of the wall portion, the bent portion is bent to form an arc-shaped area corresponding to the area of ​​the first opening, and the arc-shaped area passes through the first opening of the corresponding first groove and extends into the first groove.

6. The battery cell of claim 5, wherein, Multiple bending portions are stacked in the arc-shaped regions corresponding to the same first opening in the thickness direction of the wall portion and extend into the corresponding first groove; Along the thickness direction of the wall portion, in two adjacent arcuate regions, the maximum curvature of the arcuate region closer to the wall portion is greater than the maximum curvature of the arcuate region farther from the wall portion.

7. The battery cell of claim 1, wherein, Along the thickness direction of the wall portion, a gap channel is formed between two adjacent bends; The gap channel has a communication port at one end away from the body portion, and at least a portion of the communication port is located within the first groove and communicates with the first groove.

8. The battery cell of claim 7, wherein, The maximum dimension of the area of ​​the gap channel corresponding to the first opening in the thickness direction of the wall gradually increases from one end of the bend connecting to the body to the end of the bend away from the body.

9. The battery cell of claim 7, wherein, Along the thickness direction of the wall portion, in two adjacent gap channels, the maximum dimension of the portion of the gap channel closer to the wall portion whose opening is located in the first groove is greater than the maximum dimension of the portion of the gap channel farther from the wall portion whose opening is located in the first groove is located in the thickness direction of the wall portion.

10. The battery cell of claim 1, wherein, The plurality of said pole segments include a first pole segment and a second pole segment alternately arranged along the first direction, the first pole segment and the second pole segment having opposite polarities, and the end of the first pole segment near the wall portion in the thickness direction of the wall portion does not extend beyond the second pole segment; 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 closer to the wall portion in the thickness direction of the wall portion.

11. The battery cell of any one of claims 1-10, wherein, A second groove is provided on the surface of at least one side of the isolation section, the second groove including a first groove segment located on the bend, the first groove segment communicating with at least one of the first grooves.

12. The battery cell of claim 11, wherein, Along the thickness direction of the wall portion, the surface of the bent portion facing the support member is provided with the first groove segment, and the first groove segment is provided corresponding to the first opening of at least one first groove.

13. The battery cell of claim 11, wherein, Along the thickness direction of the wall portion, the surface of the bent portion opposite to the support member is provided with the first groove segment; The first groove extends through the end face of the bent portion away from the body portion and forms a second opening, and at least a portion of the second opening is located within the first groove and communicates with the first groove.

14. The battery cell of claim 11, wherein, Along the thickness direction of the wall portion, at least one region of the bent portion having the first groove segment passes through the first opening of at least one first groove and extends into the first groove.

15. The battery cell of claim 14, wherein, Along the thickness direction of the wall portion, at least one of the bent portions is bent to form an arc-shaped area corresponding to the area of ​​the first opening, at least a portion of the arc-shaped area is located within the first groove, and at least a portion of at least one of the first groove segments is disposed in the arc-shaped area.

16. The battery cell of claim 11, wherein, The first groove segment extends along the extension direction of the bend.

17. The battery cell of claim 11, wherein, The first groove extends to the end of the bent portion away from the body portion.

18. The battery cell of claim 11, wherein, The first groove extends along the first direction, and the support member is provided with multiple rows of first grooves arranged at intervals along the second direction, and each row of first grooves includes at least one first groove. The thickness direction of the wall, the first direction and the second direction are perpendicular to each other. In a projection plane perpendicular to the thickness direction of the wall portion, the orthographic projection of the groove wall surface of the first groove segment extends along the first direction, and at least a portion of the orthographic projection of the groove wall surface of the first groove segment lies within the orthographic projection of the groove wall surface of a row of the first grooves.

19. The battery cell according to claim 11, characterized in that, The second groove also includes a second groove segment located on the body portion, and the second groove segment communicates with the first groove segment.

20. The battery cell of claim 19, wherein, The second groove segment extends along the thickness direction of the wall portion.

21. The battery cell of claim 19, wherein, The second groove extends to the end of the body portion away from the bend.

22. The battery cell of claim 11, wherein, The isolation section has a plurality of second grooves on at least one side of its surface, and the plurality of second grooves are arranged at intervals along the second direction, wherein the thickness direction of the wall, the first direction and the second direction are perpendicular to each other.

23. The battery cell of claim 11, wherein, The isolation section includes a base film and a coating. The base film has the coating on at least one side in its thickness direction. The coating has a porous structure, and the second groove is disposed on the coating.

24. The battery cell of claim 23, wherein, The depth of the second groove is less than the thickness of the coating.

25. The battery cell of claim 23, wherein, The second groove penetrates the coating along its thickness direction.

26. The battery cell of any one of claims 1-10, wherein, The first groove extends along the first direction.

27. The battery cell of claim 26, wherein, The first groove extends in the first direction at a length greater than the maximum dimension of the bent portion in the first direction.

28. The battery cell according to claim 26, characterized in that, The support member is provided with multiple rows of first grooves arranged at intervals along the second direction, and each row of first grooves includes at least one first groove. The thickness direction of the wall, the first direction and the second direction are perpendicular to each other.

29. The battery cell of claim 26, wherein, The support member has a first surface facing the electrode assembly and a second surface facing away from the electrode assembly in the thickness direction of the wall portion, and the first groove penetrates the first surface and forms the first opening; The support member also has an outer peripheral surface that connects the first surface and the second surface, and at least one end of the first groove in the first direction penetrates the outer peripheral surface to form a third opening.

30. The battery cell of claim 29, wherein, 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 of the first grooves is formed between every two adjacent support portions.

31. The battery cell according to claim 30, characterized in that, The two ends of the connecting part are respectively connected to the middle of two adjacent supporting parts, and two first grooves are formed between the two adjacent supporting parts. The two first grooves are respectively located on both sides of the connecting part in the first direction.

32. The battery cell of claim 31, wherein, 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.

33. The battery cell of claim 30, wherein, 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.

34. The battery cell according to claim 33, 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.

35. The battery cell of claim 33, wherein, 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.

36. The battery cell of any one of claims 1-10, wherein, The support member has a first surface facing the electrode assembly and a second surface facing away from the electrode assembly in the thickness direction of the wall portion, and the first groove penetrates the first surface and forms the first opening; Along the thickness direction of the wall portion, at least one of the first grooves penetrates the second surface and forms a fourth opening.

37. The battery cell of any one of claims 1-10, wherein, Along the thickness direction of the wall portion, the electrode assembly directly abuts against the support member.

38. The battery cell of any one of claims 1-10, wherein, The battery cell further includes an insulating component, which covers the outside of the electrode assembly and 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.

39. The battery cell of claim 38, wherein, The support member and the insulating part are integrally arranged; or The support member and the insulation part are integrally formed.

40. A battery device, comprising: Includes the battery cell as described in any one of claims 1-39.

41. An electrical device, comprising: Includes a battery cell as described in any one of claims 1-39, the battery cell being used to provide electrical energy.

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