Battery monomer, battery device and electric device

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to a single battery, a battery device and a power utilization device.The single battery comprises a shell, an end cover, a supporting piece and at least one electrode assembly, and electrolyte is contained in the shell; the end cover covers the opening of the shell, and the shell comprises a first wall; at least part of the electrode assembly is contained in the shell, the electrode assembly comprises a first pole piece, the electrode assembly is provided with a first end face facing the first wall, and the end of the first pole piece faces the first end face; at least part of the supporting piece is located between the first end face and the first wall and makes contact with the first end face, the supporting piece is provided with at least one containing groove, and the containing groove is provided with a first opening facing the first end face, so that electrolyte contained in the containing groove can flow to the first end face of the electrode assembly through the first opening, and therefore the electrode assembly is soaked; the infiltration difficulty of the electrode assembly is reduced, and the cycle performance of the battery monomer is improved.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. In this context, electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the automotive industry's sustainable development. For electric vehicles, battery technology is a crucial factor in the development of the supporting components and electrode assemblies.

[0003] In the development of battery technology, cycle performance is a crucial indicator for individual battery cells. If cycle performance cannot be guaranteed, it severely impacts battery usability. Therefore, improving battery cycle performance is a pressing technical problem that needs to be solved in battery technology.

[0004] The above statements are for the purpose of providing background information in relation to this application only and do not necessarily constitute prior art. Utility Model Content

[0005] The purpose of this application is to provide a battery cell, a battery device, and an electrical device that can improve the cycle performance of the battery cell.

[0006] The technical solution adopted in the embodiments of this application is:

[0007] In a first aspect, a battery cell is provided, including a housing, an end cap, a support member, and at least one electrode assembly. The housing contains an electrolyte; the end cap is disposed over an opening in the housing, and the housing includes a first wall; at least a portion of the electrode assembly is housed within the housing, the electrode assembly includes a first electrode plate, the electrode assembly has a first end face facing the first wall, and the end of the first electrode plate is disposed facing the first end face; at least a portion of the support member is located between the first end face and the first wall and contacts the first end face, and the support member has at least one receiving groove, the receiving groove having a first opening facing the first end face.

[0008] By adopting the technical solution of this embodiment, at least a portion of the electrode assembly is located inside the housing, which contains an electrolyte; an end cap is provided at the opening of the housing to close the housing; the housing has a first wall; the electrode assembly includes a first electrode plate, which has a first end face facing the first wall; the end of the first electrode plate is disposed facing the first end face; a support member is located between the first end face and the first wall; the support member contacts the first end face; and the receiving groove of the support member has a first opening facing the first end face, so that the electrolyte contained in the receiving groove can flow through the first opening to the first end face of the electrode assembly, thereby wetting the end of the first electrode plate, reducing the difficulty of wetting the end of the first electrode plate, improving the wetting effect of the first electrode plate, improving the wetting effect of the electrode assembly, and improving the cycle performance of the battery cell.

[0009] In some embodiments, a first end face of at least one electrode assembly covers a first opening of at least one receiving groove.

[0010] By adopting the technical solution of this embodiment, the first end face can cover the first opening, so that the electrolyte can flow directly through the first opening to the first end face, thereby wetting the end of the first electrode, improving the wetting effect of the end of the first electrode, improving the wetting effect of the first electrode, and improving the cycle performance of the battery cell.

[0011] In some embodiments, the number of electrode assemblies is two, and the arrangement direction of the two electrode assemblies is perpendicular to the thickness direction of the support; the first end faces of the two electrode assemblies cover the first opening of all the receiving grooves.

[0012] By adopting the technical solution of this embodiment, all the first grooves can provide electrolyte to the electrode components in the battery cell, which is beneficial to improving the wetting effect of the electrode components and improving the cycle performance of the battery cell.

[0013] In some embodiments, the electrode assembly includes a flat portion, the portion of the first electrode located in the flat portion includes a first electrode layer, the number of first electrode layers is multiple, and the multiple first electrode layers are stacked along a first direction; at least a portion of the receiving groove is a first groove, and the first groove extends along the first direction.

[0014] By adopting the technical solution of this embodiment, the first groove extends along the stacking direction of the multiple first electrode layers, which is beneficial for the electrolyte contained in the first groove to flow to the multiple first electrode layers, thereby wetting the multiple first electrode layers, improving the overall wetting effect of the electrode assembly, and improving the cycle performance of the battery cell.

[0015] In some embodiments, at least one first groove spans at least two adjacent first electrode layers along a first direction.

[0016] By adopting the technical solution of this embodiment, the first groove can provide electrolyte to at least two adjacent first electrode layers, thereby wetting multiple first electrode layers, which is beneficial to improving the overall wetting effect of the electrode assembly and improving the cycle performance of the battery cell.

[0017] In some embodiments, the support member includes a plurality of first branches arranged along a second direction, with at least one first groove formed between two adjacent first branches; the second direction is perpendicular to the first direction and the thickness direction of the support member.

[0018] By adopting the technical solution of this embodiment, the support member adopts a first branch structure with multiple first branches arranged along the second direction, which is simple in structure and easy to process and manufacture.

[0019] In some embodiments, the support member further includes a connecting portion, and a plurality of first branches are spaced apart along a second direction, with adjacent first branches connected by the connecting portion.

[0020] By adopting the technical solution of this embodiment, two adjacent first branches are connected by a connecting part, which can increase the structural strength of the support and improve the reliability of the battery cell.

[0021] In some embodiments, the two ends of the connecting portion are respectively connected to the middle of two adjacent first branches; two first grooves are formed between the two adjacent first branches, and the two first grooves are respectively located on opposite sides of the connecting portion along the first direction.

[0022] By adopting the technical solution of this embodiment, the connecting part is connected to the middle of the two first branches, which can form two first grooves. The two first grooves are arranged at intervals along the first direction. The electrolyte flows through the support member along the first grooves on opposite sides of the first direction to both sides of the electrode assembly in the battery cell, which is beneficial to improve the wetting effect of the electrode assembly and improve the cycle performance of the battery cell.

[0023] In some embodiments, the support member has a first side and a second side that are distributed opposite to each other along a first direction, and the distance between at least one connecting portion and the first side and the distance between the connecting portion and the second side are not equal; and / or, the dimensions of two first grooves located on opposite sides of the same connecting portion along the first direction are not equal along the first direction.

[0024] By adopting the technical solution of this embodiment, at least one connecting part may not be located in the middle position of the support member along the first direction, so that the first groove can extend to the middle position of the electrode assembly in the battery cell along the first direction, thereby providing electrolyte to the middle position of the electrode assembly in the battery cell along the first direction, improving the wetting effect of the electrode assembly in the battery cell along the first direction, improving the wetting effect of the electrode assembly, and improving the cycle performance of the battery cell.

[0025] In some embodiments, the number of connecting parts is multiple, and the multiple connecting parts include at least one first connecting part and at least one second connecting part; the support has a first side surface, which is located on one side of the support in a first direction; the distance between all the first connecting parts and the first side surface and the distance between all the second connecting parts and the first side surface are not equal.

[0026] By adopting the technical solution of this embodiment, the distance between all the first connecting parts and the first side is not equal to the distance between all the second connecting parts and the first side, so that the first connecting parts and the second connecting parts are staggered, which can disperse the pressure of the electrode assembly on the support, reduce the stress concentration of the support, reduce the risk of deformation of the support, and improve the reliability of the battery cell.

[0027] In some embodiments, the support has a central axis parallel to a second direction; at least one first connecting portion is located on one side of the central axis in the first direction, and at least one second connecting portion is located on the other side of the central axis in the first direction.

[0028] By adopting the technical solution of this embodiment, the first connecting part and the second connecting part are respectively distributed on opposite sides of the support member along the first direction, so that both opposite sides of the support member along the first direction have good structural strength, which can better disperse the pressure of the electrode assembly on the support member, reduce stress concentration of the support member, reduce the risk of deformation of the support member, and improve the reliability of the battery cell.

[0029] In some embodiments, the number of first connecting portions is multiple, and the multiple first connecting portions are linearly distributed along the second direction; and / or, the number of second connecting portions is multiple, and the multiple second connecting portions are linearly distributed along the second direction.

[0030] By adopting the technical solution of this embodiment, the multiple connecting parts are arranged neatly, and the processing and manufacturing of the support is simple and convenient. In addition, it can also better disperse the pressure of the electrode assembly on the support, reduce the stress concentration of the support, reduce the risk of deformation of the support, and improve the reliability of the battery cell.

[0031] In some embodiments, there are multiple first connecting portions and multiple second connecting portions, and the multiple first connecting portions and multiple second connecting portions are alternately distributed along a second direction.

[0032] By adopting the technical solution of this embodiment, multiple first connecting parts and multiple second connecting parts are alternately distributed along the second direction. The distribution of the connecting parts is more dispersed, which helps to disperse the pressure of the electrode assembly on the support, reduce stress concentration of the support, reduce the risk of deformation of the support, and improve the reliability of the battery cell.

[0033] In some embodiments, there are multiple connecting portions, and the multiple connecting portions are distributed in a straight line along the second direction.

[0034] By adopting the technical solution of this embodiment, the support component has a regular structure and is easy to process and manufacture.

[0035] In some embodiments, the support member has a first side and a second side that are distributed opposite to each other along a first direction, and the distance between at least one connecting portion and the first side is equal to the distance between the connecting portion and the second side; and / or, two first grooves located on opposite sides of the same connecting portion along the first direction have equal dimensions along the first direction.

[0036] By adopting the technical solution of this embodiment, the dimensions of the first grooves on opposite sides of the same connection part are equal along the first direction, so that the electrode components in the battery cell can be well wetted on opposite sides along the first direction, which is beneficial to improving the cycle performance of the battery cell.

[0037] In some embodiments, at least two first grooves located on the same side of the connection and arranged along the second direction have different dimensions along the first direction.

[0038] By adopting the technical solution of this embodiment, a notch can be formed on one side of the support member along the first direction. The notch can accommodate electrolyte, and the electrolyte contained in the notch can directly wet the electrode assembly, which is beneficial to improving the cycle performance of the battery cell.

[0039] In some embodiments, at least three first grooves located on the same side of the connector and arranged along the second direction have a gradually increasing size along the first direction; and / or, at least three other first grooves located on the same side of the connector and arranged along the second direction have a gradually decreasing size along the first direction.

[0040] By adopting the technical solution of this embodiment, a notch can be formed on one side of the support member along the first direction. The notch can accommodate electrolyte, and the electrolyte contained in the notch can directly wet the electrode assembly, which is beneficial to improving the cycle performance of the battery cell.

[0041] In some embodiments, the dimensions of at least three consecutively arranged first grooves located on the same side of the connection and arranged along the second direction decrease first and then increase along the first direction.

[0042] By adopting the technical solution of this embodiment, a V-shaped notch can be formed on one side of the support member along the first direction. The V-shaped notch can accommodate electrolyte, and the electrolyte contained in the V-shaped notch can directly wet the electrode assembly, which is beneficial to improving the cycle performance of the battery cell. In addition, the structural strength of the support member can also be well taken into account, which is beneficial to improving the reliability of the battery cell.

[0043] In some embodiments, two adjacent first branches are connected on the same side of the connecting portion along the first direction and form a first groove.

[0044] By adopting the technical solution of this embodiment, the support has a simple structure and is easy to process and manufacture; in addition, the connecting part is located at the end of the first branch, and the first groove can extend from one side of the electrode assembly in the battery cell to the other side along the first direction, which is beneficial to guide the electrolyte to wet the middle position of the electrode assembly in the battery cell and improve the cycle performance of the battery cell.

[0045] In some embodiments, there are multiple first grooves, which are arranged along a second direction, and at least two first grooves have the same size along a first direction.

[0046] By adopting the technical solution of this embodiment, the support component has a regular and simple structure and is easy to process and manufacture.

[0047] In some embodiments, the support member further includes a plurality of second branches spaced apart along a second direction, with two adjacent second branches connected to the side of the connecting portion away from the first branch, and a first groove formed between two adjacent second branches.

[0048] By adopting the technical solution of this embodiment, the support member is provided with first grooves on both sides of the opposite sides along the first direction. The electrolyte can wet the corresponding opposite sides of the electrode assembly in the battery cell through the first grooves on both sides of the support member, which is beneficial to improving the cycle performance of the battery cell.

[0049] In some embodiments, along the first direction, the projection of at least one first branch does not completely overlap with the projections of all second branches.

[0050] By adopting the technical solution of this embodiment, the first branch and the second branch are staggered, which helps to disperse the pressure of the electrode assembly on the support, improve the uniformity of the force on the connection, reduce stress concentration, reduce the risk of deformation of the support, and improve the reliability of the battery cell.

[0051] In some embodiments, along the second direction, a plurality of first branches and a plurality of second branches are alternately distributed.

[0052] By adopting the technical solution of this embodiment, the first branch and the second branch are staggered and distributed on both sides of the support, which effectively disperses the pressure of the electrode assembly on the support, improves the uniformity of the force on the connection, reduces stress concentration, reduces the risk of deformation of the support, and improves the reliability of the battery cell.

[0053] In some embodiments, along the first direction, the dimension of at least one first groove along the second direction first decreases and then increases.

[0054] By adopting the technical solution of this embodiment, the first groove can form a Laval nozzle structure. The electrolyte flows into the first groove from the opening behind the connection part and flows towards the connection part. During this process, the flow area of ​​the electrolyte gradually decreases, the flow rate of the electrolyte increases, and the static pressure decreases. After the electrolyte flows through the minimum flow area of ​​the first groove, the flow rate of the electrolyte further increases, which improves the flow efficiency of the electrolyte into the electrode assembly, improves the wetting effect of the electrode assembly, and improves the cycle performance of the battery cell.

[0055] In some embodiments, two adjacent first branches are arranged at an angle.

[0056] By adopting the technical solution of this embodiment, two adjacent first branches are set at an angle, and the supporting force of the support member on the electrode assembly can be distributed obliquely along the first branch, which is beneficial to disperse the supporting force and improve the reliability of the battery cell.

[0057] In some embodiments, the support member further includes a plurality of second branches spaced apart along a second direction, with two adjacent second branches connected to the side of the connecting portion facing away from the first branch, and the two adjacent second branches being arranged at an included angle to form a first groove.

[0058] By adopting the technical solution of this embodiment, two adjacent second branches are set at an angle, and the supporting force of the support member on the electrode assembly can be distributed obliquely along the second branch, which is beneficial to disperse the supporting force and improve the reliability of the battery cell.

[0059] In some embodiments, a plurality of first branches are connected sequentially along a second direction, and two adjacent first branches are arranged at an angle to form a first groove.

[0060] By adopting the technical solution of this embodiment, two adjacent first branches are set at an angle, and the supporting force of the support member on the electrode assembly can be distributed obliquely along the first branch, which is beneficial to disperse the supporting force and improve the reliability of the battery cell.

[0061] In some embodiments, the electrode assembly includes a flat portion, the portion of the first electrode located in the flat portion includes a first electrode layer, the number of first electrode layers is multiple, the multiple first electrode layers are stacked along a first direction, and the second direction is perpendicular to the first direction and the thickness direction of the support member; at least a portion of the receiving groove is a first groove, the first groove extends along the second direction.

[0062] By adopting the technical solution of this embodiment, the first groove extends along the stacking direction of the multiple first electrode layers and the thickness direction of the support member, so that the first groove can extend along the length direction of the first electrode layer, so that the electrolyte contained in the first groove can better wet the first electrode layer, improve the wetting effect of the electrode assembly, and improve the cycle performance of the battery cell.

[0063] In some embodiments, the support member includes a connecting portion and a plurality of first branches spaced apart along a first direction, with the two ends of the connecting portion respectively connected to the middle of two adjacent first branches; two first grooves are formed between two adjacent first branches, and the two first grooves are respectively located on opposite sides of the connecting portion along a second direction.

[0064] By adopting the technical solution of this embodiment, two adjacent first branches are connected by a connecting part, which can increase the structural strength of the support and improve the reliability of the battery cell. In addition, the structure of the support is simple and easy to process and manufacture.

[0065] In some embodiments, the support member has a third side and a fourth side that are distributed opposite to each other along a second direction, and the distance between at least one connecting portion and the third side is equal to the distance between the connecting portion and the fourth side; and / or, two first grooves located on opposite sides of the same connecting portion along the second direction have equal dimensions along the second direction.

[0066] By adopting the technical solution of this embodiment, the dimensions of the first grooves on opposite sides of the same connection part along the second direction are equal, so that the electrode components in the battery cell can be well wetted on opposite sides along the second direction, which is beneficial to improving the cycle performance of the battery cell.

[0067] In some embodiments, the number of connecting parts is multiple, and the multiple connecting parts are distributed in a straight line along a first direction.

[0068] By adopting the technical solution of this embodiment, the support component has a regular structure and is easy to process and manufacture.

[0069] In some embodiments, the size of the first groove ranges from 0.5 mm to 30 mm along the extension direction perpendicular to the first groove and the thickness direction of the support.

[0070] By adopting the technical solution of this embodiment, the support member has good structural strength to better support the electrode assembly, and the first groove can accommodate a large amount of electrolyte to wet the electrode assembly. Furthermore, with the first groove penetrating the side of the support member, the electrolyte can flow into the electrode assembly at a suitable flow rate, improving the cycle performance of the battery cell.

[0071] In some embodiments, the size of the first groove ranges from 0.1 mm to 3 mm along the thickness direction of the support member.

[0072] By adopting the technical solution of this embodiment, the first groove can accommodate more electrolyte to wet the electrode assembly, and it is also beneficial to reasonably set the thickness of the support member, which is beneficial to improving the energy density of the battery cell.

[0073] In some embodiments, the support member has a first surface and a second surface disposed opposite to each other along its own thickness direction, and a side surface connecting the first surface and the second surface. The first surface is disposed facing the first end surface, the second surface is disposed away from the first end surface, the first opening is located on the first surface, and at least one receiving groove penetrates the side surface and forms the second opening.

[0074] By adopting the technical solution of this embodiment, the setting of the second opening allows the electrolyte outside the support and electrode assembly to flow into the receiving tank from the second opening, and then flow to the first end face through the receiving tank and the first opening, which effectively improves the wetting effect of the electrode assembly and improves the cycle performance of the battery cell.

[0075] In some embodiments, at least one side of the first end face protrudes from the side and forms a receiving space, and the second opening communicates with the receiving space.

[0076] By adopting the technical solution of this embodiment, the electrolyte located in the containment space can enter the containment tank through the second opening, and then flow to the end of the first electrode through the containment tank and the first opening, thereby improving the wetting effect of the first electrode and improving the cycle performance of the battery cell.

[0077] In some embodiments, at least one receiving groove extends through at least one end of the side along a first direction to form a second opening, the first direction being the width direction of the support member.

[0078] By adopting the technical solution of this embodiment, the electrolyte can enter the receiving tank through the second opening formed on the side of the receiving tank, and then flow along the receiving tank to the first end face, thereby wetting the first electrode sheet, improving the wetting effect of the first electrode sheet, and improving the cycle performance of the battery cell.

[0079] In some embodiments, the width of the support is W along the first direction, and the dimensions of all electrode assemblies are T1, where 0.9 ≤ W / T1 < 1.

[0080] By adopting the technical solution of this embodiment, along the first direction, the electrode assembly protrudes from the opposite sides of the support member, and the opposite sides of the support member can form a receiving space. The electrolyte in the receiving space can flow into the receiving tank through the second opening, and then flow into the first end face through the receiving tank, thereby wetting the first electrode sheet, improving the wetting effect of the first electrode sheet, and improving the cycle performance of the battery cell. In addition, the support member can better support the electrode assembly, improving the reliability of the battery cell.

[0081] In some embodiments, at least one receiving groove extends through at least one end of the side along a second direction to form a second opening, the second direction being the length direction of the support member.

[0082] By adopting the technical solution of this embodiment, the electrolyte can enter the receiving tank through the second opening formed on the side of the receiving tank, and then flow along the receiving tank to the first end face, thereby wetting the first electrode sheet, improving the wetting effect of the first electrode sheet, and improving the cycle performance of the battery cell.

[0083] In some embodiments, along the second direction, the electrode assembly has a size of L1 and the support has a length of L2, wherein 0.95 ≤ L2 / L1 < 1.

[0084] By adopting the technical solution of this embodiment, along the second direction, the electrode assembly protrudes from the opposite sides of the support member, and the opposite sides of the support member can form a receiving space. The electrolyte in the receiving space can flow into the receiving tank through the second opening, and then flow into the first end face through the receiving tank, thereby wetting the first electrode sheet, improving the wetting effect of the first electrode sheet, and improving the cycle performance of the battery cell. In addition, the support member can better support the electrode assembly, improving the reliability of the battery cell.

[0085] In some embodiments, along a first direction, the ends of two adjacent first branches located on the same side are connected by a connecting portion, and the ends of two adjacent first branches located on the other side are connected by a connecting portion.

[0086] By adopting the technical solution of this embodiment, each of the two adjacent first branches is connected to a connecting part at both ends along the first direction, which improves the structural strength of the support and helps to improve the reliability of the battery cell.

[0087] In some embodiments, the support member has a first surface and a second surface disposed opposite to each other along its own thickness direction, the first surface is disposed facing the first end surface, the second surface is disposed away from the first end surface, a first opening is located on the first surface, and at least one receiving groove penetrates the second surface to form a third opening.

[0088] By adopting the technical solution of this embodiment, the electrolyte can flow into the receiving tank from the third opening, which improves the wetting effect of the electrode assembly and is beneficial to improving the cycle performance of the battery cell.

[0089] In some embodiments, the battery cell includes a first insulating member, at least a portion of which is located within a housing, the first insulating member having a receiving space, at least a portion of the electrode assembly and a support member being located within the receiving space, and the first insulating member having a first through hole communicating with the receiving space and the outside of the first insulating member.

[0090] By adopting the technical solution of this embodiment, the electrolyte can enter the receiving space through the first through hole to wet the electrode assembly, which is beneficial to improve the wetting effect of the electrode assembly and improve the cycle performance of the battery cell. In addition, the support is located inside the first insulating member and the support has a receiving groove. A large amount of electrolyte will accumulate in the space between the receiving groove and the side of the support. The electrolyte in the receiving groove will wet the electrode assembly through the first opening, which improves the wetting performance of the electrode assembly and improves the cycle performance of the battery cell.

[0091] In some embodiments, the first insulating member has a second wall, at least a portion of which is located between the support member and the first wall. The second wall has a first through hole that penetrates the second wall along the thickness direction of the support member. Along the thickness direction of the support member, the projection of the first through hole does not coincide with the projection of all the third openings.

[0092] By adopting the technical solution of this embodiment, the first through hole penetrates the second wall, and the electrolyte outside the first insulating component can enter the first insulating component through the first through hole, thereby wetting the electrode assembly and improving the cycle performance of the battery cell; the third opening is staggered from the first through hole, so that the second wall can block the active material falling from the electrode assembly, reduce the risk of the falling active material coming into contact with the first wall, reduce the risk of the falling active material corroding the shell, and improve the reliability of the battery cell.

[0093] In some embodiments, the support further includes a substrate, a plurality of first branches are spaced apart along a second direction, the substrate is located between a first end face and a first wall, and the plurality of first branches are connected to the surface of the substrate facing the first end face.

[0094] By adopting the technical solution of this embodiment, the substrate can increase the structural strength of the support and improve the reliability of the battery cell. In addition, the substrate can also close the opening of the first groove facing away from the electrode assembly to prevent the active material falling from the electrode assembly from passing through the support, reduce problems such as electrochemical corrosion of the casing, and also help improve the structural reliability of the battery cell.

[0095] In some embodiments, the support includes a connecting portion, the two ends of which are connected to the middle of two adjacent first branches; two first grooves are formed between the two adjacent first branches, and the two first grooves are respectively located on opposite sides of the connecting portion along a first direction.

[0096] In some embodiments, at least a portion of the surface of at least one first branch facing the first end face is an arc surface.

[0097] By adopting the technical solution of this embodiment, the arc surface setting can reduce the contact area between the first end face and the support member, increase the contact area between the electrolyte in the receiving tank and the first end face, improve the wetting effect of the electrode assembly, and improve the cycle performance of the battery cell.

[0098] In some embodiments, at least a portion of the surface of at least one connecting portion facing the first end face is an arc surface.

[0099] By adopting the technical solution of this embodiment, the arc surface setting can reduce the contact area between the first end face and the support member, increase the contact area between the electrolyte in the receiving tank and the first end face, improve the wetting effect of the electrode assembly, and improve the cycle performance of the battery cell.

[0100] In some embodiments, a second through hole is provided at least one end of the support member along the second direction, the second through hole penetrates the support member along the thickness direction, the first branch is provided with the second through hole; and / or, the connecting portion is provided with the second through hole.

[0101] By adopting the technical solution of this embodiment, the setting of the second through hole can utilize the differences in shape and position of the second through hole to distinguish the two ends of the support member along the second direction, so as to facilitate the assembly of the first insulating member.

[0102] In some embodiments, the support member further includes a substrate and a plurality of spaced protrusions; the substrate is located between a first end face and a first wall, the plurality of protrusions are connected to the surface of the substrate facing the first end face, and the plurality of protrusions and the substrate form at least one receiving groove.

[0103] By adopting the technical solution of this embodiment, the support member adopts a structure of substrate and protrusion. The protrusion supports the electrode assembly, which helps to reduce the contact area between the support member and the electrode assembly, improves the wetting effect of the electrode assembly, and improves the cycle performance of the battery cell. The support member can form a well-connected receiving groove, which helps to improve the wetting effect of the electrode assembly and improve the cycle performance of the battery cell. In addition, the structure of the support member is simple and the processing and manufacturing are more convenient.

[0104] In some embodiments, the number of receiving slots is multiple, and the multiple protrusions are arranged in a matrix to form multiple receiving slots arranged in a crisscross pattern.

[0105] By adopting the technical solution of this embodiment, the support member forms multiple accommodating grooves arranged in a crisscross pattern. These grooves are interconnected, which helps to improve the wetting effect of the electrode assembly and the cycle performance of the battery cell. In addition, the support member has a simple structure and is easier to process and manufacture.

[0106] In some embodiments, at least a portion of the surface of at least one protrusion facing the first end face is an arc surface.

[0107] By adopting the technical solution of this embodiment, the surface of the protrusion facing away from the substrate can be an arc surface to increase the contact area between the electrolyte and the first end face, improve the wetting effect of the electrode assembly, and improve the cycle performance of the battery cell.

[0108] In some embodiments, the size of the substrate ranges from 0.1 mm to 1 mm along the thickness direction of the support member.

[0109] By adopting the technical solution of this embodiment, the support has good structural strength, so as to better support the electrode assembly; in addition, the substrate occupies little space, which is beneficial to improving the volumetric energy density of the battery cell.

[0110] In some embodiments, the thickness of the support member ranges from 0.1 mm to 3 mm.

[0111] By adopting the technical solution of this embodiment, the support has good structural strength, so as to better support the electrode assembly; in addition, the support occupies little space, which is conducive to improving the volumetric energy density of the battery cell.

[0112] In some embodiments, the support member has a first surface, which is disposed facing a first end face, and a first opening is located on the first surface; the area of ​​the first surface is S1, and the area of ​​the first opening of all receiving slots is S2, 0.1≤S2 / (S1+S2)≤0.8; optionally, 0.4≤S2 / (S1+S2)≤0.7.

[0113] By adopting the technical solution of this embodiment, the support member can better support the electrode assembly, and also enables the receiving tank to hold more electrolyte or the electrolyte to flow into the electrode assembly through the receiving tank at a better flow rate, thereby improving the wetting effect of the electrode assembly and improving the cycle performance of the battery cell.

[0114] In some embodiments, the support is an insulating component.

[0115] By adopting the technical solution of this embodiment, the support can insulate and separate the first wall and the electrode assembly, which can reduce the risk of short circuit in the battery cell and improve the reliability of the battery cell.

[0116] In some embodiments, the battery cell includes a first insulating member, at least a portion of which is located within a housing. The first insulating member has a receiving space, at least a portion of the electrode assembly and a support member are both located within the receiving space, and the first insulating member has a second wall, at least a portion of which is located between the support member and the first wall. The support member and the second wall are integrally formed.

[0117] By adopting the technical solution of this embodiment, the second wall of the first insulating member and the support member are integrally formed, which can save manufacturing processes and improve production efficiency.

[0118] In some embodiments, the battery cell has a third through hole that penetrates the support and the second wall along the thickness direction of the support.

[0119] By adopting the technical solution of this embodiment, the electrolyte located outside the first insulating member can directly wet the electrode assembly through the third through hole, thereby improving the wetting effect of the electrode assembly and improving the cycle performance of the battery cell.

[0120] In some embodiments, the battery cell includes a first insulating member, at least a portion of which is located within a housing, the first insulating member having a receiving space, at least a portion of the electrode assembly and the support member being located within the receiving space.

[0121] By adopting the technical solution of this embodiment, the first insulating component can insulate and separate the electrode assembly and the casing, which is beneficial to improving the reliability of the battery cell.

[0122] In some embodiments, the battery cell includes a second insulator, at least a portion of which is located on the side of the end cap facing the electrode assembly, and a first insulator is connected to the second insulator.

[0123] By adopting the technical solution of this embodiment, the second insulating component can insulate and separate the electrode assembly and the end cap, thereby reducing the risk of short circuit in the electrode assembly and improving the reliability of the battery cell.

[0124] In some embodiments, the battery cell includes an electrode terminal and a second insulating member. The electrode terminal is disposed on an end cap and is electrically connected to an electrode assembly. At least a portion of the second insulating member is located on the side of the end cap facing the electrode assembly, and the second insulating member insulatingly separates the electrode terminal and the end cap.

[0125] By adopting the technical solution of this embodiment, the second insulating member can insulate and separate the electrode assembly and the end cap, as well as the end cap and the electrode terminal, thereby reducing the risk of short circuit in the battery cell and improving the reliability of the battery cell.

[0126] In some embodiments, the housing is an insulating housing.

[0127] By adopting the technical solution of this embodiment, the insulating shell itself has insulating properties, which can realize the insulation between the shell and the electrode assembly, and is beneficial to eliminate the need for the first insulating component and improve the energy density of the battery cell.

[0128] In some embodiments, the inner wall of the housing is covered with an insulating coating.

[0129] By adopting the technical solution of this embodiment, the insulating coating can insulate and separate the shell and electrode assembly, which helps to eliminate the need for the first insulating component and improve the energy density of the battery cell.

[0130] In some embodiments, the housing includes an integrally formed outer peripheral wall and an end wall, the outer peripheral wall being connected to the periphery of the end wall, and an end cap being sealed to an opening in the outer peripheral wall facing away from the end wall, the end wall forming a first wall.

[0131] By adopting the technical solution of this embodiment, the housing includes an integrally formed outer peripheral wall and end wall, which can reduce the risk of electrolyte leakage from the outer peripheral wall and end wall and help improve the sealing performance of the battery cell; in addition, the opening on one side of the housing, as well as the support and end cap, are located on opposite sides of the electrode assembly, which facilitates the installation of the electrode assembly and support into the housing.

[0132] By adopting the technical solution of this embodiment, under its own gravity, the electrolyte will accumulate at the bottom of the shell and in the receiving groove of the support member. The first opening of the receiving groove is set facing the first end face, so that the accumulated electrolyte can wet the bottom of the first electrode and climb up along the first electrode. This helps to break the limitation of the battery cell in the height direction and the limitation of the charging rate, so that the battery cell can have higher energy density and cycle performance.

[0133] In some embodiments, the bottom wall of the shell forms a first wall along the direction of gravity.

[0134] By adopting the technical solution of this embodiment, the electrolyte will accumulate at the bottom of the shell and in the receiving groove of the support due to its own gravity. The first opening of the receiving groove is set facing the first end face, so that the accumulated electrolyte can wet the bottom of the first electrode and climb up along the first electrode. This helps to break the limitation of the battery cell in the height direction and the limitation of the charging rate, so that the battery cell can have higher energy density and cycle performance.

[0135] In some embodiments, the electrode assembly includes a second electrode and an isolator, the first electrode and the second electrode having different polarities; a portion of the isolator is located between the first electrode and the second electrode, the isolator extends beyond the first electrode and the second electrode toward the end of the support, and the isolator is bent toward the end of the support to form a laminated structure and a first end face.

[0136] By adopting the technical solution of this embodiment, the support member has a receiving groove, and the position of the stacked structure opposite to the first opening is not under pressure. Therefore, the position of the stacked structure that is not under pressure is relatively loose, and the electrolyte can flow through the loose part of the stacked structure to the first electrode and the second electrode, thereby improving the wetting effect of the electrode assembly and improving the cycle performance of the battery cell. In addition, the electrolyte can also directly pass through the separator and extend out of the ends of the first electrode and the second electrode, flowing to the first electrode and the second electrode, improving the wetting effect of the first electrode and the second electrode, and improving the cycle performance of the battery cell. The separator extends out of the end of the support member between the first electrode and the second electrode, so that the separator can insulate and separate the ends of the first electrode and the second electrode close to the support member, reducing the short circuit risk of the electrode assembly and improving the reliability of the battery cell.

[0137] In some embodiments, the electrode assembly includes a flat portion, a portion of the first electrode in the flat portion including a first electrode layer, a portion of the second electrode in the flat portion including a second electrode layer, and a portion of the separator in the flat portion including a separator layer; the number of first electrode layers, second electrode layers, and separator layers are all multiple; each separator layer includes a main body portion and a bent portion, at least a portion of the main body portion is located between adjacent first electrode layers and second electrode layers, the end of the main body portion facing the support member is connected to the bent portion, the bent portion is entirely located outside the corresponding adjacent first electrode layers and the bent portion is bent relative to the main body portion; the bent portions of two adjacent separator layers are stacked, and a gap is formed between the bent portions of two adjacent separator layers.

[0138] By adopting the technical solution of this embodiment, the electrolyte can flow to the first and second electrodes through the gap between the bends of two adjacent separators, improving the wetting effect of the electrode assembly. In addition, the support is provided with a receiving groove, and the position of the bend opposite to the first opening is suspended. The bends of the two adjacent separators are in a relatively loose state in the suspended position, so that the gap between the bends of the two adjacent separators has a large space in the suspended position. The electrolyte can flow to the first and second electrodes quickly through this space, thereby effectively improving the wetting effect of the electrode assembly and improving the cycle performance of the battery cell.

[0139] In some embodiments, the bends of two adjacent isolation layers are partially staggered.

[0140] By adopting the technical solution of this embodiment, in the bend of two adjacent isolation layers, the electrolyte can directly enter between the bends of the two adjacent isolation layers from the part of the bend of one isolation layer that does not cover the bend of the other isolation layer, reducing the difficulty of the electrolyte flowing to the first or second electrode, improving the wetting effect of the electrode assembly, and improving the cycle performance of the battery cell.

[0141] In some embodiments, the portion of the bent portion of at least one isolation layer away from the end of the main body is located within a corresponding receiving groove.

[0142] By adopting the technical solution of this embodiment, the electrolyte can directly enter between the bends of two adjacent insulating layers through the end of the bend away from the main body, so that the electrolyte can flow to the first electrode or the second electrode more quickly, thereby improving the wetting effect of the electrode assembly and improving the cycle performance of the battery cell.

[0143] In some embodiments, the electrode assembly is a wound structure, with tabs extending from the end of the electrode assembly facing away from the first wall; or, the electrode assembly is a stacked structure, with tabs extending from at least one side of the electrode assembly other than the side near the first wall.

[0144] By adopting the technical solution of this embodiment, the tabs and the support are located on opposite sides of the electrode assembly, which can reduce the impact of the tabs on the electrolyte flow to the first electrode, and is beneficial to improving the cycle performance and performance of the battery cell.

[0145] In some embodiments, the battery cell is a lithium iron phosphate battery cell, and the size of the battery cell ranges from 100mm to 400mm along the thickness direction of the support member; or, the battery cell is a ternary lithium battery cell, and the size of the battery cell ranges from 100mm to 300mm along the thickness direction of the support member.

[0146] By adopting the technical solution of this embodiment, the size of the battery cell is set within the above-mentioned range along the thickness direction of the support member. The larger size of the battery cell along the thickness direction of the support member is beneficial to improving the energy density of the battery cell. The electrode assembly inside the battery cell has a larger size along the thickness direction of the support member, and the electrolyte is not easy to flow to the end of the electrode assembly facing away from the support member, which limits the performance of the battery cell. However, the support member of this embodiment is provided with a receiving groove, which can provide electrolyte to the electrode assembly of the battery cell, improve the ability of the electrolyte to climb along the thickness direction of the support member, and improve the cycle performance of the battery cell.

[0147] Secondly, a battery device is provided, comprising a plurality of the aforementioned battery cells.

[0148] The battery device in this application uses the aforementioned battery cells, which have good cycle performance, thus improving the performance and lifespan of the battery device.

[0149] In some embodiments, in the battery device, the bottom wall of the casing forms a first wall along the direction of gravity.

[0150] By adopting the technical solution of this embodiment, in the battery device, the electrolyte will accumulate at the bottom of the shell and in the receiving groove of the support under its own gravity. The first opening of the receiving groove is set facing the first end face, so that the accumulated electrolyte can wet the bottom of the first electrode and climb up along the first electrode. This helps to break the limitation of the battery cell in the height direction and the limitation of the charging rate, so that the battery cell can have higher energy density and cycle performance.

[0151] Thirdly, an electrical device is provided, comprising the aforementioned battery cell or battery device, wherein the battery cell or battery device is used to store or provide electrical energy.

[0152] The electrical device in this application uses the aforementioned battery cell, which has good cycle performance, thus improving the performance and lifespan of the electrical device.

[0153] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0154] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0155] Figure 1 The diagram shows the structural features of a vehicle provided in some embodiments of this application.

[0156] Figure 2 This is an exploded view of a battery device provided in some embodiments of this application.

[0157] Figure 3 The diagram shows the structure of a single battery cell provided in some embodiments of this application.

[0158] Figure 4 This is an exploded view of a battery cell provided in some embodiments of this application.

[0159] Figure 5 This is an exploded view of a battery cell provided in some other embodiments of this application.

[0160] Figure 6 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application.

[0161] Figure 7 For along Figure 6 Sectional view along line AA in the middle.

[0162] Figure 8 for Figure 7 A magnified view of a section at point B.

[0163] Figure 9 Cross-sectional view of an electrode assembly provided in some embodiments of this application.

[0164] Figure 10 Cross-sectional view of an electrode assembly provided for other embodiments of this application.

[0165] Figure 11 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application.

[0166] Figure 12 For along Figure 11Sectional view of the CC line.

[0167] Figure 13 A cross-sectional view of an electrode assembly provided for some embodiments of this application.

[0168] Figure 14 A cross-sectional view of an electrode assembly provided for some embodiments of this application.

[0169] Figure 15 This is a schematic diagram of the structure of the support provided in some embodiments of this application.

[0170] Figure 16 for Figure 15 The diagram shows the structure of the support component.

[0171] Figure 17 This is a structural schematic diagram of a support member provided for other embodiments of this application.

[0172] Figure 18 This is a structural schematic diagram of a support member provided in some embodiments of this application.

[0173] Figure 19 This is a structural schematic diagram of a support member provided in some embodiments of this application.

[0174] Figure 20 This is a structural schematic diagram of a support member provided in some embodiments of this application.

[0175] Figure 21 This is a structural schematic diagram of a support member provided in some embodiments of this application.

[0176] Figure 22 This is a structural schematic diagram of a support member provided in some embodiments of this application.

[0177] Figure 23 This is a structural schematic diagram of a support member provided in some embodiments of this application.

[0178] Figure 24 This is a structural schematic diagram of a support member provided in some embodiments of this application.

[0179] Figure 25 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application.

[0180] Figure 26 For along Figure 25 Sectional view of the DD line.

[0181] Figure 27 for Figure 26 A magnified view of a section at point E in the middle.

[0182] Figure 28This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application.

[0183] Figure 29 The battery cells provided in some embodiments of this application are Figure 26 A magnified view of a section at point E in the middle.

[0184] Figure 30 This is a structural schematic diagram of a support member provided in some embodiments of this application.

[0185] Figure 31 This is a structural schematic diagram of a support member provided in some embodiments of this application.

[0186] Figure 32 This is a structural schematic diagram of a support member provided in some embodiments of this application.

[0187] Figure 33 This is a structural schematic diagram of a support member provided in some embodiments of this application.

[0188] Figure 34 This is a schematic diagram of the structure of the support and the second wall provided in some embodiments of this application.

[0189] Figure 35 For along Figure 34 Sectional view of the FF line.

[0190] Figure 36 For some embodiments of this application, the battery cell is provided along Figure 6 A partial schematic diagram of the cross-sectional view along line AA.

[0191] The following are the labeling elements in the figure:

[0192] 1000, Vehicle; 1100, Battery assembly; 1200, Controller; 1300, Motor; 100, Battery cell; 1001, Receiving space; 1002, Third through hole; 110, Housing; 111, Outer peripheral wall; 112, End wall; 113, First wall; 120, End cap; 130, Electrode assembly; 1301, First end face; 1302, Straight portion; 1303, Bending portion; 1304, Tab; 305. Positive electrode tab; 1306. Negative electrode tab; 131. First electrode; 1311. First electrode layer; 132. Second electrode; 1321. Second electrode layer; 133. Spacer; 1331. Spacer layer; 13311. Main body; 13312. Bending part; 1332. Spacer section; 1333. Gap; 134. Positive electrode; 135. Negative electrode; 140. Support; 1401. Receiving groove; 1401 1. First groove; 14012. Second groove; 1402. First opening; 1403. First surface; 1404. Second surface; 1405. Side surface; 14051. First side surface; 14052. Second side surface; 14053. Third side surface; 14054. Fourth side surface; 1406. Second opening; 1407. Third opening; 1408. Second through hole; 141. First support; 142. Connecting part; 14 21. First connecting part; 1422. Second connecting part; 143. Second branch; 144. Substrate; 145. Protrusion; 150. First insulating member; 1501. Receiving space; 151. Second wall; 1511. First through hole; 160. Electrode terminal; 161. Positive electrode terminal; 162. Negative electrode terminal; 170. Second insulating member; 200. Housing; 210. First housing; 220. Second housing. Detailed Implementation

[0193] 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 and completely 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.

[0194] In the description of the embodiments of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" and "second" may explicitly or implicitly include at least one of that feature.

[0195] In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise expressly and specifically limited.

[0196] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0197] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0198] In the description of this application, it should be understood that the terms "inner", "outer", "side", "upper", "bottom", "front", "rear", etc., indicating the orientation or positional relationship are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0199] In the description of this application, it should be noted that the term "and / or" is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone.

[0200] It should also be noted that in the embodiments of this application, the same reference numerals are used to represent the same component or part. For the same part in the embodiments of this application, the reference numerals may only be used to mark one part or component as an example. It should be understood that the reference numerals are also applicable to other identical parts or components.

[0201] A single battery cell can be a rechargeable battery, which refers to a battery cell that can be recharged after being discharged to activate the active materials and continue to be used.

[0202] A battery device refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity.

[0203] A battery cell includes an electrode assembly and a housing for housing the electrode assembly. The housing includes an end cap and a casing. The electrode assembly is placed inside the casing, and the end cap closes to the opening of the casing to seal it. The electrode assembly includes a separator and two electrodes with opposite polarities, with the separator separating the two electrodes. The battery cell also includes a support member located between the casing and the electrode assembly. The end faces of the electrode assembly and the electrodes abut against the support member, which increases the difficulty of electrolyte flow to the ends of the electrodes and is detrimental to improving the cycle performance of the electrode assembly.

[0204] Based on this, some embodiments of this application provide a battery cell, which includes a housing, an end cap, a support member, and at least one electrode assembly. The housing contains an electrolyte; the end cap is disposed over the opening of the housing, and the housing includes a first wall; at least a portion of the electrode assembly is housed within the housing, and the electrode assembly includes a first electrode plate, the electrode assembly including a first end face facing the first wall, and the end of the first electrode plate is disposed facing the first end face; the support member is housed within the housing, at least a portion of the support member is located between the first end face and the first wall, and the support member is in contact with the first end face; wherein the support member is provided with at least one receiving groove, and the receiving groove has a first opening facing the first end face.

[0205] The battery cell support member of this application embodiment has a receiving groove, and the receiving groove has a first opening facing the first end face, so that the electrolyte contained in the receiving groove can flow through the first opening to the first end face of the electrode assembly, thereby wetting the end of the first electrode sheet, reducing the difficulty of wetting the end of the first electrode sheet, improving the wetting effect of the first electrode sheet, improving the wetting effect of the electrode assembly, and improving the cycle performance of the battery cell.

[0206] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0207] like Figure 1 As shown, a battery device 1100 is installed inside the vehicle 1000. The battery device 1100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 1100 can be used to power the vehicle 1000; for example, the battery device 1100 can serve as the operating power source for the vehicle 1000.

[0208] The vehicle 1000 may also include a controller 1200 and a motor 1300. The controller 1200 is used to control the battery device 1100 to supply power to the motor 1300, for example, for the power needs of the vehicle 1000 during startup, navigation and driving.

[0209] In some embodiments of this application, the battery device 1100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0210] See Figure 2 As shown, in some embodiments, the battery device 1100 may include one or more battery cell assemblies for providing voltage and capacity.

[0211] A battery cell assembly may include multiple battery cells 100, which are connected in series, parallel, or mixed connection via a busbar. Mixed connection means that some of the multiple battery cells 100 are connected in series and others in parallel.

[0212] The battery cell 100 can be a secondary battery cell, which refers to a battery cell 100 that can be used again after being discharged by recharging to activate the active materials.

[0213] As an example, the battery cell 100 can be a lithium-ion battery cell, a sodium-ion battery cell, a sodium-lithium-ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium-sulfur battery cell, a magnesium-ion battery cell, a nickel-metal hydride battery cell, a nickel-cadmium battery cell, a lead-acid battery cell, etc.

[0214] In some embodiments, a battery cell assembly is typically formed by arranging a plurality of battery cells 100; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing a plurality of battery cells 100 into a single module. As an example, a battery module can be formed by binding a plurality of battery cells 100 together with cable ties.

[0215] In some embodiments, the battery device 1100 may be a battery pack, which includes a housing 200 and one or more battery cell assemblies housed within the housing 200. As an example, the battery cell assembly may be a battery module, which can be housed within the housing 200 by securing a battery module to the housing 200. Alternatively, as an example, the battery cell assembly may be housed within the housing 200 by directly securing multiple battery cells 100 to the housing 200.

[0216] In some embodiments, the housing 200 is used to house the battery cell 100, and the housing 200 can have various structures.

[0217] In some embodiments, the housing 200 may include a first housing 210 and a second housing 220. The first housing 210 and the second housing 220 are fastened together to form a closed space inside the housing 200 for housing the battery cell assembly. Here, "closed" refers to covering or closing, and can be sealed or unsealed. The first housing 210 may be a top cover or a bottom plate.

[0218] In some embodiments, the housing 200 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, thereby forming an enclosed space inside the housing 200 to accommodate the battery cell assembly. As an example, the frame may include multiple side beams.

[0219] In some embodiments, the housing 200 may be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 200 may be at least a portion of the floor of the vehicle 1000, or a portion of the housing 200 may be at least a portion of the crossbeams and longitudinal beams of the vehicle 1000.

[0220] In some embodiments, the battery device 1100 may be an energy storage device.

[0221] Energy storage devices can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. Energy storage devices can store electrical energy as needed and output it when appropriate. For example, energy storage devices can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours.

[0222] In some embodiments, the energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0223] See Figures 3-5 As shown, this application provides a battery cell 100, which includes a housing 110, an end cap 120 and an electrode assembly 130. The housing 110 has an opening, and the end cap 120 is connected to the housing 110 and covers the opening.

[0224] The housing 110 is a component used to fit the end cap 120 to form an internal cavity of the battery cell 100, which can be used to accommodate the electrode assembly 130, electrolyte and other components.

[0225] The housing 110 and the end cap 120 can be separate components. For example, an opening can be provided on the housing 110, and the end cap 120 can be used to close the opening to form an internal cavity of the battery cell 100.

[0226] The casing 110 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0227] The shape of the end cap 120 can be adapted to the shape of the housing 110 to fit the housing 110. The material of the end cap 120 can be the same as or different from the material of the housing 110. Optionally, the end cap 120 can be made of a material with a certain hardness and strength (such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.), so that the end cap 120 is not easily deformed when subjected to compression and impact, so that the battery cell 100 can have higher structural strength and improve reliability.

[0228] The end cap 120 is connected to the housing 110 by welding, bonding, snap-fitting or other means.

[0229] The housing 110 may be open at one end or at both ends.

[0230] In some examples, housing 110 may be a structure with an opening on one side, and end cap 120 may be provided and cover housing 110.

[0231] For example, the housing 110 includes an integrally formed outer peripheral wall 111 and an end wall 112. The outer peripheral wall 111 is connected around the end wall 112, and the end cap 120 is sealed to the opening of the outer peripheral wall 111 away from the end wall 112. The outer peripheral wall 111 and the end wall 112 are manufactured using integral forming processes such as stamping or integral casting.

[0232] In other examples, the housing 110 may also be a structure with openings on both sides, and two end caps 120 are provided, with the two end caps 120 respectively covering the two openings of the housing 110.

[0233] See Figures 6-14 As shown, electrode assembly 130 is a component in battery cell 100 where electrochemical reactions occur. Electrode assembly 130 can be entirely housed within housing 110 or partially housed within housing 110. For example, a portion of the tab 1304 of electrode assembly 130 can extend outside housing 110.

[0234] Optionally, the electrode assembly 130 is entirely housed within the housing 110. The number of electrode assemblies 130 can be one or more, wherein multiple electrode assemblies 130 can be stacked, and of course, multiple electrode assemblies 130 can also be arranged in other ways.

[0235] In some embodiments, the electrode assembly 130 includes a positive electrode 134 and a negative electrode 135. During the charging and discharging of the battery cell 100, active ions (e.g., lithium ions) are inserted and extracted back and forth between the positive electrode 134 and the negative electrode 135.

[0236] In some embodiments, the positive electrode 134 may include a positive current collector and a layer of positive active material disposed on at least one surface of the positive current collector.

[0237] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material layer is disposed on either or both of the two opposite surfaces of the positive current collector.

[0238] As an example, the positive current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, nickel alloys, titanium, or silver. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum 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.).

[0239] As an example, the positive electrode active material layer includes a positive electrode active material, which 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 manganese iron phosphate, and lithium manganese iron phosphate and carbon composites. Examples of lithium transition metal oxides may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM) 622 LiNi 0.8 Co 0.1 Mn0.1 O2 (also known as NCM) 811 ), lithium nickel cobalt aluminum oxide (such as LiNi) 0.8 Co 0.15 Al 0.05 At least one of O2 and its modified compounds. Modified compounds refer to substances obtained by modification methods such as doping or coating based on the above-mentioned substances.

[0240] In some embodiments, the negative electrode 135 may include a negative electrode current collector and a layer of negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0241] 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 layer is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0242] As an example, the negative electrode current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, nickel alloys, titanium, or silver. The composite current collector may include a polymer material substrate and a metal layer. The composite current collector 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.).

[0243] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cell 100. 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 negative electrode active materials for battery cell 100 may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0244] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0245] In some embodiments, the electrode assembly 130 further includes a separator 133 disposed between the positive electrode 134 and the negative electrode 135. The separator 133 can prevent short circuits between the positive and negative electrodes while allowing active ions to pass through.

[0246] The separator 133 may be partially located between the positive electrode 134 and the negative electrode 135. For example, the separator 133 protrudes from both ends of the positive electrode 134 and the negative electrode 135 along the axial direction of the battery cell 100; or, the entire separator 133 may be located between the positive electrode 134 and the negative electrode 135.

[0247] In some embodiments, the separator 133 is a separator membrane. The separator membrane of this application can be any known porous structure separator membrane with good chemical and mechanical stability.

[0248] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different. The separator 133 can be a single component located between the positive electrode 134 and the negative electrode 135, or it can be attached to the surface of the positive electrode 134 or the surface of the negative electrode 135. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can also be applied to the surface of the separator.

[0249] In some embodiments, the battery cell 100 further includes an electrolyte that serves to conduct ions between the positive electrode 134 and the negative electrode 135. The electrolyte used in this application can be selected according to requirements.

[0250] In some embodiments, the electrolyte includes an electrolyte salt and a solvent.

[0251] In some embodiments, the electrolyte salt may be selected from 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.

[0252] In some embodiments, the solvent may be selected from at least one of 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 of 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.

[0253] In some embodiments, the electrolyte may optionally include additives. For example, the additives may include negative electrode film-forming additives, positive electrode film-forming additives, and additives that can improve certain properties of the battery cell 100, such as additives that improve the overcharge / fast charge performance of the battery cell 100, additives that improve the high-temperature performance of the battery cell 100, additives that improve the low-temperature performance of the battery cell 100, etc.

[0254] The electrode assembly 130 can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked. The shape of the electrode assembly 130 can be cylindrical, flat, or polygonal, etc.

[0255] In some embodiments, the electrode assembly 130 is provided with tabs 1304, which can conduct current from the electrode assembly 130. Tabs 1304 are divided into positive tabs 1305 and negative tabs 1306.

[0256] As an example, the battery cell 100 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic battery cells, such as hexagonal prismatic battery cells.

[0257] In some embodiments, the battery cell 100 includes a housing 110, an end cap 120, a support member 140, and at least one electrode assembly 130. The housing 110 contains an electrolyte. The end cap 120 covers the opening of the housing 110, and the housing 110 includes a first wall 113. At least a portion of the electrode assembly 130 is housed within the housing 110. The electrode assembly 130 includes a first electrode 131 and has a first end face 1301 facing the first wall 113. The end of the first electrode 131 is disposed facing the first end face 1301. At least a portion of the support member 140 is located between the first end face 1301 and the first wall 113 and contacts the first end face 1301. The support member 140 has at least one receiving groove 1401, and the receiving groove 1401 has a first opening 1402 disposed facing the first end face 1301.

[0258] The first wall 113 refers to any wall portion of the shell 110.

[0259] See Figure 4 As shown, in some examples, the first wall 113 may refer to the end wall 112.

[0260] In some examples, the outer peripheral wall 111 includes a plurality of first sidewalls that are connected end to end in sequence along the circumference of the end wall 112. The first wall 113 may refer to any one of the first sidewalls in the outer peripheral wall 111.

[0261] See Figure 5As shown, in some examples, the housing 110 has openings on opposite sides, and there are two end caps 120. The two end caps 120 are sealed to the two openings of the housing 110. The housing 110 includes a plurality of second sidewalls, and a plurality of first sidewalls are connected end to end along the circumference of the end caps 120. The first wall 113 can refer to any one of the second sidewalls in the housing 110.

[0262] The electrode assembly 130 includes a positive electrode 134, a negative electrode 135, and a separator 133. The electrode assembly 130 includes a first electrode 131, which can be either the positive electrode 134 or the negative electrode 135.

[0263] In some examples, the positive electrode 134, the negative electrode 135, and the separator 133 are wound together.

[0264] See Figure 9 As shown, for example, the electrode assembly 130 has a wound structure. Exemplarily, the positive electrode 134, the separator 133, and the negative electrode 135 are wound into a cylindrical wound structure and then flattened to obtain a flat electrode assembly 130.

[0265] See Figures 6-9 As shown, in some examples, when the electrode assembly 130 has a wound structure, "the end of the first electrode 131" can refer to the end of the first electrode 131 along the axial direction of the electrode assembly 130, where the axial direction (see Z direction) is perpendicular to the winding direction of the electrode assembly 130. After the positive electrode 134, negative electrode 135, and separator 133 are wound, a receiving gap is formed between the positive electrode 134 and negative electrode 135. The separator 133 is located in the receiving gap, which has openings at opposite ends along the axial direction of the electrode assembly 130. "The end of the first electrode 131" can refer to the end of the first electrode 131 near the opening of the receiving gap towards the first wall 113. In addition, electrolyte can also flow into the space between the positive electrode 134 and negative electrode 135 through this opening to wet the positive electrode 134 and negative electrode 135. The separator 133 can fill the opening completely, or it can fill a portion of the opening.

[0266] During winding, the first electrode 131 is wound along its length. "The end of the first electrode 131" can refer to the end of the first electrode 131 along its width and toward the first wall 113.

[0267] In some examples, electrode assembly 130 is a stacked structure.

[0268] See Figure 10As shown, as an example, multiple positive electrode plates 134 and multiple negative electrode plates 135 can be provided, and the multiple positive electrode plates 134 and multiple negative electrode plates 135 can be stacked alternately. Multiple separators 133 can be provided, respectively provided between any adjacent positive electrode plates 134 or negative electrode plates 135; or, the separators 133 can be provided continuously, provided between any adjacent positive electrode plates 134 or negative electrode plates 135 by folding. The positive electrode plates 134 and negative electrode plates 135 are stacked along the thickness direction of the positive electrode plate 134. "The end of the first electrode plate 131" can refer to the end of the positive electrode plate 134 along its own width direction or length direction, or the end of the negative electrode plate 135 along its own width direction or length direction.

[0269] See Figures 11-14 As shown, as an example, multiple positive electrode plates 134 can be provided, and negative electrode plates 135 are folded to form multiple stacked folded segments. A positive electrode plate 134 is sandwiched between adjacent folded segments. The spacer 133 can be continuously provided and is provided between any adjacent positive electrode plates 134 or folded segments by folding. "The end of the first electrode plate 131" can refer to the end of the positive electrode plate 134 along its own width direction or length direction, or the end of the folded segment along its own width direction or length direction.

[0270] The first end face 1301 can refer to the end face where the ends of the electrode assembly 130 and the first electrode 131 are located on the same side. The first end face 1301 can be a plane or close to a plane.

[0271] See Figures 6-10 As shown, in some examples, the electrode assembly 130 is a wound structure, and the surface formed by the bend of the isolator 133 near the end of the first electrode 131, extending out between the positive electrode 134 and the negative electrode 135, is the first end face 1301.

[0272] In some examples, the electrode assembly 130 has a stacked structure, and there are multiple spacers 133, which are respectively disposed between any adjacent positive electrode 134 or negative electrode 135. The surface formed by bending the ends of the multiple spacers 133 near the first electrode 131 between the positive electrode 134 and the negative electrode 135 is the first end face 1301.

[0273] See Figures 11-14 As shown, in some examples, the electrode assembly 130 has a stacked structure, and the separator 133 can be continuously arranged. The separator 133 is arranged between any adjacent positive electrode 134 or negative electrode 135 by folding. The separator 133 is folded to form multiple separator segments 1332. In the multiple separator segments 1332, the ends of two adjacent separator segments 1332 near the first wall 113 are connected and bent to form a first end face 1301.

[0274] The end of the separator 133 near the first electrode 131 extends between the positive electrode 134 and the negative electrode 135, which can insulate and separate the ends of the positive electrode 134 and the negative electrode 135, reduce the risk of short circuit between the positive electrode 134 and the negative electrode 135, and help improve the reliability of the battery cell 100.

[0275] In some examples, the end of the separator 133 near the first electrode 131 does not extend between the positive electrode 134 and the negative electrode 135, and the end face of the positive electrode 134 or the negative electrode 135 facing the first wall 113 forms a first end face 1301.

[0276] The support member 140 can refer to the component located between the first wall 113 and the first end face 1301, and the support member 140 can support the electrode assembly 130.

[0277] In some examples, the support member 140 is a plate-like structure, with the first wall 113 and the first end face 1301 located on opposite sides of the support member 140 along its thickness direction Z. The first direction X can be referred to in the width direction of the support member 140, and the second direction Y can be referred to in the length direction of the support member 140.

[0278] For example, the support member 140 can also be called a base plate. The base plate raises the electrode assembly 130 to reduce the risk of interference between the electrode assembly 130 and the corner of the bottom of the housing 110. The corner can refer to a rounded structure or an inclined straight structure connecting the end wall 112 and the outer peripheral wall 111.

[0279] The support member 140 is in contact with the first end face 1301. The support member 140 is in direct contact with the first end face 1301. No other components are provided between the support member 140 and the first end face 1301.

[0280] The receiving groove 1401 can refer to the groove structure formed by the support member 140. The number of receiving grooves 1401 can be one or more. Each receiving groove 1401 has a first opening 1402 facing the first end face 1301. The first opening 1402 can refer to the opening formed by the receiving groove 1401 on the surface of the support member 140 that is in direct contact with the first end face 1301.

[0281] For example, a receiving slot 1401 has a first opening 1402, and multiple receiving slots 1401 have multiple first openings 1402.

[0282] In some examples, the receiving groove 1401 extends through the surface of the support 140 facing away from the first end face 1301, that is, the receiving groove 1401 is a through groove.

[0283] In some examples, the receiving groove 1401 does not penetrate the surface of the support 140 facing away from the first end face 1301, that is, the receiving groove 1401 is a blind groove.

[0284] In this embodiment of the battery cell 100, at least a portion of the electrode assembly 130 is located within a housing 110, which contains an electrolyte. An end cap 120 is disposed over the opening of the housing 110 to close it. The housing 110 has a first wall 113. The electrode assembly 130 includes a first electrode 131 and has a first end face 1301 facing the first wall 113. The end of the first electrode 131 is disposed facing the first end face 1301. A support member 140 is located between the first end face 1301 and the first wall 113. The support member 140 contacts the first end face 1301, and the receiving groove 1401 of the support member 140 has a first opening 1402 facing the first end face 1301, so that the electrolyte contained in the receiving groove 1401 can flow through the first opening 1402 to the first end face 1301 of the electrode assembly 130, thereby wetting the end of the first electrode 131, reducing the difficulty of wetting the end of the first electrode 131, improving the wetting effect of the first electrode 131, improving the wetting effect of the electrode assembly 130, and improving the cycle performance of the battery cell 100.

[0285] See Figure 8 As shown, in some embodiments, at least one electrode assembly 130 has a first end face 1301 covering a first opening 1402 of at least one receiving groove 1401.

[0286] In some examples, there is one electrode assembly 130, and the first end face 1301 covers the first opening 1402 of one or more receiving grooves 1401.

[0287] In some examples, there are multiple electrode assemblies 130, where the first end face 1301 of one electrode assembly 130 covers the first opening 1402 of one or more receiving grooves 1401, or the first end faces 1301 of multiple electrode assemblies 130 together cover the first opening 1402 of one or more receiving grooves 1401.

[0288] The first opening 1402, which is covered by the first end face 1301, can be completely covered by the first end face 1301, or a portion of it can be covered by the first end face 1301.

[0289] By adopting the technical solution of this embodiment, the first end face 1301 can cover the first opening 1402, so that the electrolyte can flow directly through the first opening 1402 to the first end face 1301, thereby wetting the end of the first electrode 131, improving the wetting effect of the end of the first electrode 131, improving the wetting effect of the first electrode 131, and improving the cycle performance of the battery cell 100.

[0290] In some embodiments, there are two electrode assemblies 130, and the arrangement direction of the two electrode assemblies 130 is perpendicular to the thickness direction Z of the support member 140; the first end face 1301 of the two electrode assemblies 130 covers the first opening 1402 of all receiving grooves 1401.

[0291] For example, the two electrode assemblies 130 are stacked along a first direction X, or the two electrode assemblies 130 are stacked along a second direction Y. Of course, in other examples, the two electrode assemblies 130 may also be stacked along other directions perpendicular to the thickness direction Z of the support 140.

[0292] The arrangement direction of the two electrode assemblies 130 is perpendicular to the thickness direction Z of the support member 140, such that the first end faces 1301 of the two electrode assemblies 130 are arranged side by side along the thickness direction Z perpendicular to the support member 140. The first end faces 1301 of the two electrode assemblies 130 can contact the support member 140. The first openings 1402 of all receiving grooves 1401 can be covered by the first end faces 1301 of the two electrode assemblies 130. However, it is not required that the first openings 1402 of each receiving groove 1401 be completely covered by the first end faces 1301 of the two electrode assemblies 130. It is possible that some areas of the first openings 1402 of some receiving grooves 1401 are not covered by the first end faces 1301 of the two electrode assemblies 130.

[0293] By adopting the technical solution of this embodiment, all the first grooves 14011 can provide electrolyte to the electrode assembly 130 in the battery cell 100, which is beneficial to improve the wetting effect of the electrode assembly 130 and improve the cycle performance of the battery cell 100.

[0294] In some embodiments, the housing 110 includes an integrally formed outer peripheral wall 111 and an end wall 112, the outer peripheral wall 111 being connected around the end wall 112, and an end cap 120 being sealed to an opening in the outer peripheral wall 111 facing away from the end wall 112, the end wall 112 forming a first wall 113.

[0295] End wall 112 can refer to the wall portion of housing 110 opposite to end cap 120, and end wall 112 of housing 110 forms first wall 113.

[0296] By adopting the technical solution of this embodiment, the housing 110 includes an integrally formed outer peripheral wall 111 and end wall 112, which can reduce the risk of electrolyte leakage between the outer peripheral wall 111 and end wall 112 and improve the sealing performance of the battery cell 100. In addition, the opening on one side of the housing 110, as well as the support member 140 and the end cap 120, are located on opposite sides of the electrode assembly 130, which facilitates the installation of the electrode assembly 130 and the support member 140 into the housing 110.

[0297] In some embodiments, the bottom wall of the housing 110 is a first wall 113 along the direction of gravity.

[0298] In some examples, "gravity direction" can refer to the direction of gravity when the battery cell 100 is installed on the battery device 1100; in this state, the support 140 is located below the electrode assembly 130, the first wall 113 is located below the support 140, and the first wall 113 is the bottom wall of the housing 110.

[0299] For example, the "gravity direction" can be referred to the thickness direction Z of the support 140.

[0300] In some examples, the housing 200 of the battery device 1100 includes an upper housing and a lower housing connected to each other. The upper housing and the lower housing are connected and enclosed to form a mounting cavity. The battery cell 100 is installed in the mounting cavity. The wall portion of the housing 110 of the battery cell 100 facing the bottom wall of the lower housing 200 is a first wall 113. The upper housing may adopt the structure of the first housing 210 described above, and the lower housing may adopt the structure of the second housing 220.

[0301] In some examples, the housing 200 of the battery device 1100 includes a bottom protective plate, and the wall of the housing 110 of the battery cell 100 facing the bottom protective plate is a first wall 113.

[0302] By adopting the technical solution of this embodiment, under its own gravity, the electrolyte will accumulate at the bottom of the housing 110 and in the receiving groove 1401 of the support member 140. The first opening 1402 of the receiving groove 1401 is set facing the first end face 1301, so that the accumulated electrolyte can wet the bottom of the first electrode 131 and climb upward along the first electrode 131. This helps to break the limitation of the battery cell 100 in the height direction and the limitation of the charging rate, so that the battery cell 100 can have higher energy density and cycle performance.

[0303] Please refer to the following: Figure 15 and Figure 16 As shown, in some embodiments, the electrode assembly 130 includes a flat portion 1302, and the portion of the first electrode 131 located in the flat portion 1302 includes a first electrode layer 1311. There are multiple first electrode layers 1311, and the multiple first electrode layers 1311 are stacked along the first direction X. At least a portion of the receiving groove 1401 is a first groove 14011, and the first groove 14011 extends along the first direction X.

[0304] See Figure 9As shown, in some examples, the electrode assembly 130 has a flat, wound structure. The flat portion of the electrode assembly 130 is called the flat section 1302. The portion of the first electrode 131 located within the flat section 1302 is arranged in a basically flat manner. The flat structure of the first electrode 131 located within the flat section 1302 is called the first electrode layer 1311. The first electrode 131 can be wound more than once to form multiple first electrode layers 1311. The stacking direction of the multiple first electrode layers 1311 is the first direction X.

[0305] The electrode assembly 130 also includes a bent portion 1303. Both ends of the straight portion 1302 are connected to the bent portion 1303. The bent portion 1303 is the part of the bent structure in the electrode assembly 130. The portion of the first electrode 131 located in the bent portion 1303 is basically bent. For example, the portion of the first electrode 131 located in the bent portion 1303 is a semi-circular arc structure or a semi-circular arc structure.

[0306] See Figure 10 , Figure 13 and Figure 14 As shown, in some examples, the electrode assembly 130 has a stacked structure, and the electrode assembly 130 as a whole has a flat structure. The first electrode 131 is located in a flat layer within the flat portion 1302, which is called the first electrode layer 1311. There are multiple first electrode 131s, and one first electrode 131 constitutes one first electrode layer 1311. Alternatively, the first electrode 131s can be folded to form multiple first electrode layers 1311. The stacking direction of the multiple first electrode layers 1311 is the first direction X.

[0307] The first groove 14011 is a receiving groove 1401, and the number of first grooves 14011 can be one or more; if the number of receiving grooves 1401 is one, the receiving groove 1401 is the first groove 14011; if the number of receiving grooves 1401 is multiple, the number of first grooves 14011 can be one or more.

[0308] For example, some of the recesses in the plurality of receiving grooves 1401 are first grooves 14011, and other grooves are other groove structures.

[0309] For example, multiple receiving slots 1401 are all first grooves 14011, and each receiving slot 1401 is referred to as a first groove 14011.

[0310] The first groove 14011 extends along the first direction X. It can be understood that the first groove 14011 has a certain size along the first direction X. The size l1 of the first groove 14011 along the first direction X can be greater than the size l2 of the first groove 14011 along the second direction Y, but it is not required that the size l1 of the first groove 14011 along the first direction X is greater than the size l2 of the first groove 14011 along the second direction Y.

[0311] By adopting the technical solution of this embodiment, the first groove 14011 extends along the stacking direction of the multiple first electrode layers 1311, which is beneficial for the electrolyte contained in the first groove 14011 to flow to the multiple first electrode layers 1311, thereby wetting the multiple first electrode layers 1311, improving the overall wetting effect of the electrode assembly 130, and improving the cycle performance of the battery cell 100.

[0312] In some embodiments, at least one first groove 14011 spans at least two adjacent first electrode layers 1311 along a first direction X.

[0313] In some examples, along the thickness direction Z of the support 140, the projection of one or more first grooves 14011 intersects with the projection of two adjacent first electrode layers 1311. The dimension l1 of one or more first grooves 14011 along the first direction X is greater than the dimension a of the two adjacent first electrode layers 1311 along the first direction X.

[0314] By adopting the technical solution of this embodiment, the first groove 14011 can provide electrolyte to at least two adjacent first electrode layers 1311, thereby wetting multiple first electrode layers 1311, which is beneficial to improving the overall wetting effect of the electrode assembly 130 and improving the cycle performance of the battery cell 100.

[0315] In some embodiments, the support member 140 includes a plurality of first branches 141 arranged along the second direction Y, and at least one first groove 14011 is formed between two adjacent first branches 141; the second direction Y is perpendicular to the first direction X and the thickness direction Z of the support member 140.

[0316] There are multiple first branches 141, and the multiple first branches 141 are arranged along the second direction Y. The space between two adjacent first branches 141 can form one or more first grooves 14011.

[0317] For example, a first groove 14011 may be formed between two adjacent first branches 141.

[0318] For example, two first grooves 14011 can be formed between two adjacent first branches 141, and the two first grooves 14011 are arranged along the first direction X.

[0319] In some examples, the first branch 141 refers to a long strip structure extending along the first direction X, and multiple first branches 141 are arranged at intervals along the second direction Y. The space between two adjacent first branches 141 can form a first groove 14011 or two first grooves 14011.

[0320] In some examples, the first branch 141 refers to a long strip structure that is inclined relative to the first direction X, and the space between two adjacent first branches 141 can form a first groove 14011.

[0321] By adopting the technical solution of this embodiment, the support member 140 adopts a structure of multiple first branches 141 arranged along the second direction Y, which is simple in structure and easy to process and manufacture.

[0322] In some embodiments, the support member 140 further includes a connecting portion 142, and a plurality of first branches 141 are spaced apart along a second direction Y, with adjacent first branches 141 connected by the connecting portion 142.

[0323] Multiple first branches 141 are spaced apart along the second direction Y, and the gap between two adjacent first branches 141 can form a first groove 14011 or two first grooves 14011.

[0324] The connecting portion 142 can refer to the part of the support member 140 used to connect two adjacent first branches 141. The connecting portion 142 can be perpendicularly connected to the first branch 141, or the connecting portion 142 can be inclined relative to the first branch 141. The connecting portion 142 and the first branch 141 can be manufactured by integral injection molding or integral machining, or the connecting portion 142 and the first branch 141 can be molded separately and then assembled together.

[0325] By adopting the technical solution of this embodiment, two adjacent first branches 141 are connected by a connecting part 142, which can increase the structural strength of the support member 140 and improve the reliability of the battery cell 100.

[0326] In some embodiments, the two ends of the connecting portion 142 are respectively connected to the middle of two adjacent first branches 141; two first grooves 14011 are formed between the two adjacent first branches 141, and the two first grooves 14011 are respectively located on opposite sides of the connecting portion 142 along the first direction X.

[0327] For example, the connecting portion 142 can be connected between the middle portions of two adjacent first branches 141, dividing the gap between the two adjacent first branches 141 into two parts, thereby forming two first grooves 14011. The boundary line between the connecting portion 142 and the two adjacent first branches 141 can be seen in [reference needed]. Figure 16 The dashed lines N and O are shown in the diagram.

[0328] By adopting the technical solution of this embodiment, the connecting part 142 is connected to the middle of the two first branches 141, which can form two first grooves 14011. The two first grooves 14011 are arranged at intervals along the first direction X. The electrolyte flows from the support member 140 along the first direction X to the two sides of the electrode assembly 130 in the battery cell 100, which is beneficial to improve the wetting effect of the electrode assembly 130 and improve the cycle performance of the battery cell 100.

[0329] In some embodiments, the support member 140 has a first side surface 14051 and a second side surface 14052 that are distributed opposite to each other along a first direction X, and the distance between at least one connecting portion 142 and the first side surface 14051 and the distance between it and the second side surface 14052 are not equal; and / or, the two first grooves 14011 located on opposite sides of the same connecting portion 142 along the first direction X have different dimensions along the first direction X.

[0330] Of the two sides 1405 of the support member 140 that are relatively distributed along the first direction X, one side 1405 is the first side 14051 and the other side 1405 is the second side 14052.

[0331] In some examples, the end faces of all the first branches 141 located on the same side of the support member 140 along the first direction X together form a first side surface 14051, and the end faces of all the first branches 141 located on the other side of the support member 140 along the first direction X together form a second side surface 14052. The first side surface 14051 and the second side surface 14052 can be planar structures or V-shaped surface structures, etc.

[0332] In some examples, the dimensions c1 of the plurality of first branches 141 along the first direction X are equal, the plurality of first branches 141 are arranged side by side, and the first side surface 14051 and the second side surface 14052 are planar. In other examples, the dimensions c1 of the plurality of first branches 141 along the first direction X may not be equal.

[0333] For the same connecting part 142, the distance D1 between the connecting part 142 and the first side surface 14051 is greater than or less than the distance D2 between the connecting part 142 and the second side surface 14052, so that the connecting part 142 is not located at the middle position of the support member 140 along the first direction X, thereby forming two first grooves 14011 with different dimensions along the first direction X. The number of connecting parts 142 that are not located at the middle position of the support member 140 along the first direction X is one or more.

[0334] In the two first grooves 14011 located on opposite sides of the same connecting portion 142 along the first direction X, the size l1 of the first groove 14011 closer to the first side 14051 along the first direction X is not equal to the size l1 of the first groove 14011 farther from the first side 14051 along the first direction X; in the two first grooves 14011, the size l1 of one first groove 14011 along the first direction X is greater than or less than the size l1 of the other first groove 14011 along the first direction X.

[0335] In some examples, the support 140 has a first side 14051 and a second side 14052 that are relatively distributed along a first direction X, and at least one connecting portion 142 is not equidistant from the first side 14051 and from the second side 14052.

[0336] In some examples, the two first grooves 14011 located on opposite sides of the same connection 142 along the first direction X have different dimensions along the first direction X.

[0337] In some examples, the support 140 has a first side 14051 and a second side 14052 that are relatively distributed along a first direction X, and the distance between at least one connecting portion 142 and the first side 14051 and the distance between it and the second side 14052 are not equal; the two first grooves 14011 located on opposite sides of the same connecting portion 142 along the first direction X are not equal in size along the first direction X.

[0338] In some cases, the electrolyte may not easily flow to the middle position of the electrode assembly 130 within the battery cell 100 along the first direction X. However, by adopting the technical solution of this embodiment, at least one connecting portion 142 may not be located at the middle position of the support member 140 along the first direction X, so that the first groove 14011 can extend to the middle position of the electrode assembly 130 within the battery cell 100 along the first direction X, thereby providing electrolyte to the middle position of the electrode assembly 130 within the battery cell 100 along the first direction X, improving the wetting effect of the electrode assembly 130 within the battery cell 100 along the first direction X, and improving the cycle performance of the battery cell 100.

[0339] In some embodiments, the number of connecting portions 142 is multiple, and the multiple connecting portions 142 include at least one first connecting portion 1421 and at least one second connecting portion 1422; the support member 140 has a first side surface 14051, which is located on one side of the support member 140 in the first direction X; the distance between all the first connecting portions 1421 and the first side surface 14051 and the distance between all the second connecting portions 1422 and the first side surface 14051 are not equal.

[0340] The first connecting part 1421 is a connecting part 142, and the second connecting part 1422 is a connecting part 142. The number of the first connecting parts 1421 and the number of the second connecting parts 1422 can be one or more.

[0341] For example, the number of first connecting parts 1421 and the number of second connecting parts 1422 may be equal or unequal. The number of connecting parts 142 is greater than or equal to the sum of the number of first connecting parts 1421 and the number of second connecting parts 1422.

[0342] For example, the distance d1 between all the first connecting parts 1421 and the first side surface 14051 is equal, the distance d2 between the second connecting parts 1422 and the first side surface 14051 is equal, and the distance d1 between the first connecting parts 1421 and the first side surface 14051 is greater than or less than the distance d2 between the second connecting parts 1422 and the first side surface 14051.

[0343] By adopting the technical solution of this embodiment, the distance between all the first connecting portions 1421 and the first side surface 14051 is not equal to the distance between all the second connecting portions 1422 and the first side surface 14051, so that the first connecting portions 1421 and the second connecting portions 1422 are staggered, which can disperse the pressure of the electrode assembly 130 on the support member 140, reduce the stress concentration of the support member 140, reduce the risk of deformation of the support member 140, and improve the reliability of the battery cell 100.

[0344] In some embodiments, the support member 140 has a central axis M parallel to the second direction Y; at least one first connecting portion 1421 is located on one side of the central axis M in the first direction X, and at least one second connecting portion 1422 is located on the other side of the central axis M in the first direction X.

[0345] For example, the central axis M is equidistant from the first side 14051 and the second side 14052. The central axis M is parallel or nearly parallel to the second direction Y. The central axis M divides the support member 140 into two symmetrical parts. The connecting part 142 located on the side of the central axis M along the first direction X is the first connecting part 1421. There is one or more first connecting parts 1421. The connecting part 142 located on the other side of the central axis M along the first direction X is the second connecting part 1422. There is one or more second connecting parts 1422. The central axis M is located between the first connecting part 1421 and the second connecting part 1422.

[0346] By adopting the technical solution of this embodiment, the first connecting part 1421 and the second connecting part 1422 are respectively distributed on opposite sides of the support member 140 along the first direction X, so that the opposite sides of the support member 140 along the first direction X have good structural strength, which can better disperse the pressure of the electrode assembly 130 on the support member 140, reduce the stress concentration of the support member 140, reduce the risk of deformation of the support member 140, and improve the reliability of the battery cell 100.

[0347] In some embodiments, the number of first connecting portions 1421 is multiple, and the multiple first connecting portions 1421 are linearly distributed along the second direction Y; and / or, the number of second connecting portions 1422 is multiple, and the multiple second connecting portions 1422 are linearly distributed along the second direction Y.

[0348] In some examples, the plurality of first connecting parts 1421 are arranged in a straight line along the second direction Y, and the projections of the plurality of first connecting parts 1421 along the second direction Y coincide.

[0349] In some examples, the plurality of second connecting parts 1422 are arranged in a straight line along the second direction Y, and the projections of the plurality of second connecting parts 1422 along the second direction Y coincide.

[0350] In some examples, a plurality of first connecting portions 1421 are arranged in a straight line along the second direction Y, and a plurality of second connecting portions 1422 are arranged in a straight line along the second direction Y.

[0351] By adopting the technical solution of this embodiment, the multiple connecting parts 142 are neatly distributed, and the processing and manufacturing of the support member 140 is simple and convenient. In addition, it can also better disperse the pressure of the electrode assembly 130 on the support member 140, reduce the stress concentration of the support member 140, reduce the risk of deformation of the support member 140, and improve the reliability of the battery cell 100.

[0352] In some embodiments, there are multiple first connecting portions 1421 and multiple second connecting portions 1422, and the multiple first connecting portions 1421 and multiple second connecting portions 1422 are alternately distributed along the second direction Y.

[0353] Along the second direction Y, a second connecting part 1422 is provided between two adjacent first connecting parts 1421, or a first connecting part 1421 is provided between two adjacent second connecting parts 1422.

[0354] In some examples, the multiple connecting parts 142 can be divided into only two categories: the first connecting part 1421 and the second connecting part 1422.

[0355] In some examples, the multiple connecting parts 142 are divided into first connecting parts 1421, second connecting parts 1422, and other types of connecting parts 142.

[0356] For example, along the second direction Y, the first connecting portion 142 is connected to the middle position of the first and second first branches 141 along the first direction X; the last connecting portion 142 is connected to the middle position of the last first and second last first branches 141 along the first direction X; the plurality of connecting portions 142 located between the first connecting portion 142 and the last connecting portion 142 are composed of a plurality of first connecting portions 1421 and a plurality of second connecting portions 1422 alternately distributed along the second direction.

[0357] By adopting the technical solution of this embodiment, multiple first connecting parts 1421 and multiple second connecting parts 1422 are alternately distributed along the second direction Y. The distribution of connecting parts 142 is more dispersed, which is beneficial to disperse the pressure of electrode assembly 130 on support member 140, reduce stress concentration of support member 140, reduce the risk of deformation of support member 140, and improve the reliability of battery cell 100.

[0358] See Figure 17 As shown, in some embodiments, there are multiple connecting portions 142, and the multiple connecting portions 142 are distributed in a straight line along the second direction Y.

[0359] For example, the boundary line of the connection can be seen in... Figure 17 The dashed box P.

[0360] By adopting the technical solution of this embodiment, the support member 140 has a regular structure and is easy to process and manufacture.

[0361] In some embodiments, the support member 140 has a first side surface 14051 and a second side surface 14052 that are distributed opposite to each other along a first direction X, and the distance between at least one connecting portion 142 and the first side surface 14051 and the distance between it and the second side surface 14052 are equal; and / or, two first grooves 14011 located on opposite sides of the same connecting portion 142 along the first direction X have equal dimensions along the first direction X.

[0362] The distance between one or more connecting portions 142 and the first side surface 14051 is equal to the distance between it and the second side surface 14052, such that one or more connecting portions 142 are located at the middle position of the support member 140 in the first direction X, thereby forming two first grooves 14011 of the same size along the first direction X.

[0363] For the same connecting part 142, the distance D1 between the connecting part 142 and the first side surface 14051 is equal to the distance D2 between the connecting part 142 and the second side surface 14052, so that the connecting part 142 is located at the middle position of the support member 140 along the first direction X, thereby forming two first grooves 14011 with the same size along the first direction X. The number of connecting parts 142 located at the middle position of the support member 140 along the first direction X is one or more.

[0364] In the two first grooves 14011 located on opposite sides of the same connecting portion 142 along the first direction X, the dimension l1 of the first groove 14011 closer to the first side 14051 along the first direction X is equal to the dimension l1 of the first groove 14011 farther from the first side 14051 along the first direction X; in these two first grooves 14011, the dimension l1 of one of the first grooves 14011 along the first direction X is equal to the dimension l1 of the other first groove 14011 along the first direction X.

[0365] In some examples, the support 140 has a first side 14051 and a second side 14052 that are relatively distributed along a first direction X, and at least one connecting portion 142 is at a distance from the first side 14051 equal to the distance between it and the second side 14052.

[0366] In some examples, the two first grooves 14011 located on opposite sides of the same connection 142 along the first direction X have the same size along the first direction X.

[0367] In some examples, the support 140 has a first side 14051 and a second side 14052 that are oppositely distributed along a first direction X, and the distance between at least one connecting portion 142 and the first side 14051 is equal to the distance between it and the second side 14052; two first grooves 14011 located on opposite sides of the same connecting portion 142 along the first direction X have equal dimensions along the first direction X.

[0368] By adopting the technical solution of this embodiment, the dimensions of the first grooves 14011 located on opposite sides of the same connection portion 142 are equal along the first direction X, so that the electrode assembly 130 in the battery cell 100 can be well wetted on opposite sides along the first direction X, which is beneficial to improving the cycle performance of the battery cell 100.

[0369] See Figure 18 As shown, in some embodiments, at least two first grooves 14011 located on the same side of the connecting portion 142 and arranged along the second direction Y have different dimensions l1 along the first direction X.

[0370] Among the plurality of first grooves 14011 located on the same side of the connecting portion 142 along the first direction X, two or more first grooves 14011 have different dimensions l1 along the first direction X, so that the dimensions of the portions of the plurality of first supports 141 located on the same side of the connecting portion 142 along the first direction X are different, and a notch can be formed on one side of the support member 140 along the first direction X.

[0371] By adopting the technical solution of this embodiment, a notch can be formed on one side of the support member 140 along the first direction X. The notch can accommodate electrolyte, and the electrolyte contained in the notch can directly wet the electrode assembly 130, which is beneficial to improving the cycle performance of the battery cell 100.

[0372] In some embodiments, at least three first grooves 14011 located on the same side of the connecting portion 142 and arranged along the second direction Y gradually increase in size l1 along the first direction X; and / or, at least three other first grooves 14011 located on the same side of the connecting portion 142 and arranged along the second direction Y gradually decrease in size l1 along the first direction X.

[0373] In some examples, at least three first grooves 14011 located on the same side of the connecting portion 142 and arranged along the second direction Y gradually increase in size l1 along the first direction X. Among the plurality of first grooves 14011 located on the same side of the connecting portion 142 along the first direction X, three or more first grooves 14011 may be consecutively arranged with gradually increasing size l1 along the first direction X, or three or more first grooves 14011 may be discontinuously arranged with gradually increasing size l1 along the first direction X.

[0374] In some examples, at least three additional first grooves 14011 located on the same side of the connecting portion 142 and arranged along the second direction Y gradually decrease in size l1 along the first direction X. Among the plurality of first grooves 14011 located on the same side of the connecting portion 142 along the first direction X, there may be three or more first grooves 14011 continuously arranged along the second direction Y with gradually decreasing size l1 along the first direction X, or there may be three or more first grooves 14011 discontinuously arranged along the second direction Y with gradually decreasing size l1 along the first direction X.

[0375] In some examples, at least three first grooves 14011 located on the same side of the connecting portion 142 and arranged along the second direction Y gradually increase in size l1 along the first direction X; at least three other first grooves 14011 located on the same side of the connecting portion 142 and arranged along the second direction Y gradually decrease in size l1 along the first direction X. Among the plurality of first grooves 14011 located on the same side of the connecting portion 142 along the first direction X, three or more first grooves 14011 continuously arranged along the second direction Y gradually increase in size l1 along the first direction X, and three or more first grooves 14011 discontinuously arranged along the second direction Y gradually increase in size l1 along the first direction X; three or more other first grooves 14011 continuously arranged along the second direction Y gradually decrease in size l1 along the first direction X, and three or more other first grooves 14011 discontinuously arranged along the second direction Y gradually decrease in size l1 along the first direction X.

[0376] By adopting the technical solution of this embodiment, a notch can be formed on one side of the support member 140 along the first direction X. The notch can accommodate electrolyte, and the electrolyte contained in the notch can directly wet the electrode assembly 130, which is beneficial to improving the cycle performance of the battery cell 100.

[0377] In some embodiments, at least three consecutively arranged first grooves 14011 located on the same side of the connecting portion 142 and arranged along the second direction Y decrease in size l1 along the first direction X and then increase.

[0378] The dimensions l1 of at least three or four first grooves 14011 arranged consecutively on the same side of the connecting portion 142 and along the second direction Y decrease and then increase along the first direction X.

[0379] By adopting the technical solution of this embodiment, a V-shaped notch can be formed on one side of the support member 140 along the first direction X. The V-shaped notch can accommodate electrolyte, and the electrolyte contained in the V-shaped notch can directly wet the electrode assembly 130, which is beneficial to improving the cycle performance of the battery cell 100. In addition, the structural strength of the support member 140 can also be well taken into account, which is beneficial to improving the reliability of the battery cell 100.

[0380] See Figure 19 As shown, in some embodiments, two adjacent first branches 141 are connected to the connecting portion 142 on the same side along the first direction X and form a first groove 14011.

[0381] For example, the connecting portion 142 is connected to the same end of two adjacent first branches 141 along the first direction X, thereby forming a first groove 14011. The ends of the two adjacent first branches 141 are connected to the same side of the connecting portion 142, and the two adjacent first branches 141 are located on the same side of the connecting portion 142.

[0382] By adopting the technical solution of this embodiment, the support member 140 has a simple structure and is easy to process and manufacture; in addition, the connecting part 142 is located at the end of the first branch 141, and the first groove 14011 can extend from one side of the electrode assembly 130 in the battery cell 100 to the other side along the first direction X, which is beneficial to guide the electrolyte to wet the middle position of the electrode assembly 130 in the battery cell 100 and improve the cycle performance of the battery cell 100.

[0383] In some embodiments, there are multiple first grooves 14011, and the multiple first grooves 14011 are arranged along the second direction Y, and at least two first grooves 14011 have the same size l1 along the first direction X.

[0384] Two or more first grooves 14011 have the same dimension l1 along the first direction X.

[0385] By adopting the technical solution of this embodiment, the support member 140 has a regular and simple structure and is easy to process and manufacture.

[0386] See Figure 20 As shown, in some embodiments, the support member 140 further includes a plurality of second branches 143 arranged at intervals along the second direction Y, with two adjacent second branches 143 connected to the side of the connecting portion 142 away from the first branch 141, and a first groove 14011 formed between two adjacent second branches 143.

[0387] The first branch 141 and the second branch 143 are located on opposite sides of the connecting part 142 along the first direction X. The multiple first branches 141 and multiple second branches 143 can be arranged one-to-one or staggered.

[0388] By adopting the technical solution of this embodiment, the support member 140 is provided with first grooves 14011 on both sides of the first direction X. The electrolyte can wet the corresponding opposite sides of the electrode assembly 130 in the battery cell 100 through the first grooves 14011 on both sides of the support member 140, which is beneficial to improving the cycle performance of the battery cell 100.

[0389] In some embodiments, along the first direction X, the projection of at least one first branch 141 does not completely overlap with the projections of all the second branches 143.

[0390] The projection of all the second branches 143 along the first direction X is a plurality of projection images spaced apart along the second direction Y, and the projection of one or more first branches 141 along the first direction X does not completely coincide with any of the plurality of projection images.

[0391] For example, at least one first branch 141 is offset from the corresponding second branch 143.

[0392] By adopting the technical solution of this embodiment, the first branch 141 and the second branch 143 are staggered, which helps to disperse the pressure of the electrode assembly 130 on the support member 140, improve the uniformity of the force on the connection part 142, reduce stress concentration, reduce the risk of deformation of the support member 140, and improve the reliability of the battery cell 100.

[0393] In some embodiments, a plurality of first branches 141 and a plurality of second branches 143 are alternately distributed along the second direction Y.

[0394] A second branch 143 is provided between two adjacent first branches 141, or a first branch 141 is provided between two adjacent second branches 143.

[0395] By adopting the technical solution of this embodiment, the first branch 141 and the second branch 143 are staggered and distributed on both sides of the support member 140, which effectively disperses the pressure of the electrode assembly 130 on the support member 140, improves the uniformity of the force on the connection part 142, reduces stress concentration, reduces the risk of deformation of the support member 140, and improves the reliability of the battery cell 100.

[0396] See Figure 21 As shown, in some embodiments, along the first direction X, the dimension l2 of at least one first groove 14011 along the second direction Y first decreases and then increases.

[0397] For example, the first branch 141 or part of the first branch 141 located on one side of the connecting part 142 along the first direction X is a rhomboid structure. The corner of the rhomboid structure is connected to one side of the connecting part 142. Along the first direction X, the distance between two adjacent first branches 141 decreases and then increases along the second direction Y dimension l2.

[0398] For example, the second branch 143 may be a rhombus structure, with the corner of the rhombus structure connected to one side of the connecting part 142, and the distance between two adjacent second branches 143 first decreasing and then increasing along the first direction X.

[0399] By adopting the technical solution of this embodiment, the first groove 14011 can form a Laval nozzle structure. The electrolyte flows into the first groove 14011 from the opening of the connecting part 142 away from the first groove 14011 and flows towards the connecting part 142. During this process, the flow area of ​​the electrolyte gradually decreases, the flow rate of the electrolyte increases, and the static pressure decreases. After the electrolyte flows through the minimum flow area of ​​the first groove 14011, the flow rate of the electrolyte further increases, which improves the flow efficiency of the electrolyte into the electrode assembly 130, improves the wetting effect of the electrode assembly 130, and improves the cycle performance of the battery cell 100.

[0400] See Figure 22 As shown, in some embodiments, two adjacent first branches 141 are arranged at an included angle.

[0401] For example, the first branch 141 is inclined relative to the second direction Y, and the included angle between two adjacent first branches 141 can be 30°, 60°, 90°, etc. The first branch 141 and the connecting part 142 are also arranged at an angle.

[0402] For example, two first branches 141 located on the same side of the support member 140 and continuously arranged along the second direction Y form a first branch group. There are multiple first branch groups, which are spaced apart along the second direction Y. A first groove 14011 can be formed between two adjacent first branch groups. In each first branch group, the ends of the two first branches 141 near the connecting portion 142 intersect and are connected to the connecting portion 142, and the two first branches 141 form a V-shaped structure.

[0403] By adopting the technical solution of this embodiment, two adjacent first branches 141 are arranged at an angle, and the supporting force of the support member 140 on the electrode assembly 130 can be distributed obliquely along the first branch 141, which is beneficial to disperse the supporting force and improve the reliability of the battery cell 100.

[0404] In some embodiments, the support member 140 further includes a plurality of second branches 143 arranged at intervals along the second direction Y, with two adjacent second branches 143 connected to the side of the connecting portion 142 facing away from the first branch 141, and two adjacent second branches 143 arranged at an included angle to form a first groove 14011.

[0405] For example, the second branch 143 is inclined relative to the second direction Y, and the included angle between two adjacent second branches 143 can be 30°, 60°, 90°, etc. The second branch 143 and the connecting part 142 are also arranged at an angle.

[0406] For example, two second branches 143 located on the same side of the support member 140 and continuously arranged along the second direction Y form a second branch group. There are multiple second branch groups, spaced apart along the second direction Y. A first groove 14011 can be formed between two adjacent second branch groups. In each second branch group, the ends of the two second branches 143 near the connecting portion 142 intersect and connect to the connecting portion 142, forming a V-shaped structure.

[0407] The first branch group and the second branch group can be set up one-to-one. For example, the first branch group and the corresponding second branch group can form an X-shaped structure.

[0408] Of course, in other examples, the first branch group and the second branch group can also be set separately.

[0409] By adopting the technical solution of this embodiment, two adjacent second branches 143 are arranged at an angle, and the supporting force of the support member 140 on the electrode assembly 130 can be distributed obliquely along the second branch 143, which is beneficial to disperse the supporting force and improve the reliability of the battery cell 100.

[0410] See Figure 23 As shown, in some embodiments, a plurality of first branches 141 are connected sequentially along the second direction Y, and two adjacent first branches 141 are arranged at an angle to form a first groove 14011.

[0411] For example, the first branch 141 is inclined relative to the first direction X, and the included angle between two adjacent first branches 141 can be 30°, 60°, 90°, etc. Two adjacent first branches 141 form a V-shaped structure, and multiple first branches 141 connected in sequence can form a broken line structure.

[0412] By adopting the technical solution of this embodiment, two adjacent first branches 141 are arranged at an angle, and the supporting force of the support member 140 on the electrode assembly 130 can be distributed obliquely along the first branch 141, which is beneficial to disperse the supporting force and improve the reliability of the battery cell 100.

[0413] See Figure 24 As shown, in some embodiments, the electrode assembly 130 includes a flat portion 1302, and the portion of the first electrode 131 located in the flat portion 1302 includes a first electrode layer 1311. There are multiple first electrode layers 1311, and the multiple first electrode layers 1311 are stacked along a first direction X. The second direction Y is perpendicular to the first direction X and the thickness direction Z of the support member 140. At least a portion of the receiving groove 1401 is a first groove 14011, and the first groove 14011 extends along the second direction Y.

[0414] The first groove 14011 extends along the second direction Y. It can be understood that the first groove 14011 has a certain size along the second direction Y. The size l2 of the first groove 14011 along the second direction Y can be greater than the size l1 of the first groove 14011 along the first direction X, but it is not required that the size l2 of the first groove 14011 along the second direction Y is greater than the size l1 of the first groove 14011 along the first direction X.

[0415] By adopting the technical solution of this embodiment, the first groove 14011 extends along the stacking direction perpendicular to the plurality of first electrode layers 1311 and the thickness direction Z of the support member 140, so that the first groove 14011 can extend along the length direction of the first electrode layer 1311, so that the electrolyte contained in the first groove 14011 can better wet the first electrode layer 1311, improve the wetting effect of the electrode assembly 130, and improve the cycle performance of the battery cell 100.

[0416] In some embodiments, the support member 140 includes a connecting portion 142 and a plurality of first branches 141 arranged at intervals along a first direction X. The two ends of the connecting portion 142 are respectively connected to the middle of two adjacent first branches 141. Two first grooves 14011 are formed between two adjacent first branches 141, and the two first grooves 14011 are respectively located on opposite sides of the connecting portion 142 along a second direction Y.

[0417] The number of first branches 141 is multiple, and the multiple first branches 141 are arranged at intervals along the first direction X. The connecting part 142 is connected to the middle of two adjacent first branches 141, thereby forming two first grooves 14011 between two adjacent first branches 141.

[0418] In some examples, the first branch 141 refers to a long strip structure extending along the second direction Y. Multiple first branches 141 are arranged at intervals along the first direction X. The connecting part 142 is perpendicularly connected between two adjacent first branches 141. The space between two adjacent first branches 141 can form two first grooves 14011.

[0419] For example, the connecting portion 142 can be connected between the middle portions of two adjacent first branches 141, dividing the gap between the two adjacent first branches 141 into two parts, thereby forming two first grooves 14011. The boundary line between the connecting portion 142 and the two adjacent first branches 141 can be seen in [reference needed]. Figure 24 The dashed lines N and O are shown in the diagram.

[0420] By adopting the technical solution of this embodiment, two adjacent first branches 141 are connected by a connecting part 142, which can increase the structural strength of the support member 140 and improve the reliability of the battery cell 100. In addition, the support member 140 has a simple structure and is easy to process and manufacture.

[0421] In some embodiments, the support member 140 has a third side surface 14053 and a fourth side surface 14054 that are distributed opposite to each other along the second direction Y, and the distance between at least one connecting portion 142 and the third side surface 14053 and the distance between it and the fourth side surface 14054 are equal; and / or, the two first grooves 14011 located on opposite sides of the same connecting portion 142 along the second direction Y have the same dimension l2 along the second direction Y.

[0422] Of the two sides 1405 of the support member 140 that are relatively distributed along the second direction Y, one side 1405 is the third side 14053 and the other side 1405 is the fourth side 14054.

[0423] In some examples, the end faces of all the first branches 141 on the same side of the support member 140 along the second direction Y collectively form a third side surface 14053, and the end faces of all the first branches 141 on the other side of the support member 140 along the second direction Y collectively form a fourth side surface 14054. The third side surface 14053 and the fourth side surface 14054 may be planar or have a structure similar to a V-shaped surface.

[0424] In some examples, the dimensions c2 of the multiple first branches 141 along the second direction Y are equal, the multiple first branches 141 are arranged side by side, and the third side 14053 and the fourth side 14054 are planar. Of course, in other examples, the dimensions c2 of the multiple first branches 141 along the second direction Y are not equal.

[0425] For the same connecting part 142, the distance D3 between the connecting part 142 and the third side surface 14053 is equal to the distance D4 between the connecting part 142 and the fourth side surface 14054, so that the connecting part 142 is located at the middle position of the support member 140 along the second direction Y, thereby forming two first grooves 14011 with different dimensions along the second direction Y. The number of connecting parts 142 located at the middle position of the support member 140 along the second direction Y is one or more.

[0426] In the two first grooves 14011 located on opposite sides of the same connecting portion 142 along the second direction Y, the dimension l2 of the first groove 14011 closer to the third side 14053 along the second direction Y is equal to the dimension l2 of the first groove 14011 farther from the third side 14053 along the second direction Y; in these two first grooves 14011, the dimension l2 of one first groove 14011 along the second direction Y is equal to the dimension l2 of the other first groove 14011 along the second direction Y.

[0427] In some examples, the support 140 has a third side 14053 and a fourth side 14054 that are relatively distributed along the second direction Y, and the distance between at least one connecting portion 142 and the third side 14053 is equal to the distance between it and the fourth side 14054.

[0428] In some examples, the two first grooves 14011 located on opposite sides of the same connection 142 along the second direction Y have the same dimension l2 along the second direction Y.

[0429] In some examples, the support 140 has a third side 14053 and a fourth side 14054 that are distributed opposite to each other along the second direction Y, and the distance between at least one connecting portion 142 and the third side 14053 is equal to the distance between it and the fourth side 14054; the two first grooves 14011 located on opposite sides of the same connecting portion 142 along the second direction Y have the same dimension l2 along the second direction Y.

[0430] By adopting the technical solution of this embodiment, the dimensions l2 of the first grooves 14011 located on opposite sides of the same connection portion 142 along the second direction Y are equal, so that the electrode assembly 130 in the battery cell 100 can be well wetted on opposite sides along the second direction Y, which is beneficial to improving the cycle performance of the battery cell 100.

[0431] In some embodiments, the number of connecting portions 142 is multiple, and the multiple connecting portions 142 are distributed in a straight line along the first direction X.

[0432] By adopting the technical solution of this embodiment, the support member 140 has a regular structure and is easy to process and manufacture.

[0433] See Figure 16 and Figure 24 As shown, in some embodiments, the size of the first groove 14011 ranges from 0.5 mm to 30 mm along the extension direction perpendicular to the first groove 14011 and the thickness direction Z of the support member 140.

[0434] Along the extension direction perpendicular to the first groove 14011 and the thickness direction Z of the support member 140, the dimension of the first groove 14011 is w, where w can be the groove width of the first groove 14011.

[0435] For example, see Figure 16 As shown, the first groove 14011 extends along the first direction X, and w is the dimension l2 of the first groove 14011 along the second direction Y.

[0436] For example, see Figure 24 As shown, the first groove 14011 extends along the second direction Y, and w is the dimension l1 of the first groove 14011 along the first direction X.

[0437] w can be 0.5mm, 30mm, or any number between 0.5mm and 30mm; for example, w can be, but is not limited to, 0.5mm, 1mm, 3mm, 5mm, 7mm, 9mm, 10mm, 15mm, 20mm, 25mm, or 30mm.

[0438] By adopting the technical solution of this embodiment, the support member 140 has better structural strength to better support the electrode assembly 130, and the first groove 14011 can accommodate more electrolyte to wet the electrode assembly 130. In addition, with the first groove 14011 penetrating the side 1405 of the support member 140, the electrolyte can flow into the electrode assembly 130 at a suitable flow rate, improving the cycle performance of the battery cell 100.

[0439] See Figure 16 As shown, in some embodiments, the size of the first groove 14011 along the thickness direction Z of the support 140 ranges from 0.1 mm to 3 mm.

[0440] Along the thickness direction Z of the support member 140, the size of the first groove 14011 is h, where h can be the groove depth of the first groove 14011.

[0441] For example, the first groove 14011 penetrates the support 140 along the thickness direction of the support 140, where h is the thickness T of the support 140.

[0442] For example, the first groove 14011 does not penetrate the support 140 along the thickness direction of the support 140, and h is less than the thickness T of the support 140.

[0443] h can be 0.1mm, 3mm, or any number between 0.1mm and 3mm; for example, h can be, but is not limited to, 0.1mm, 0.2mm, 0.5mm, 0.8mm, 1mm, 1.5mm, 2mm, 2.5mm, or 3mm.

[0444] By adopting the technical solution of this embodiment, the first groove 14011 can accommodate a larger amount of electrolyte to wet the electrode assembly 130. The thickness of the support member 140 can be reasonably set, which is beneficial to improving the energy density of the battery cell 100.

[0445] See Figure 16 and Figure 24As shown, in some embodiments, the support member 140 has a first surface 1403 and a second surface 1404 disposed opposite to each other along its own thickness direction, and a side surface 1405 connecting the first surface 1403 and the second surface 1404. The first surface 1403 is disposed facing the first end surface 1301, the second surface 1404 is disposed away from the first end surface 1301, the first opening 1402 is located on the first surface 1403, and at least one receiving groove 1401 penetrates the side surface 1405 to form a second opening 1406.

[0446] Of the two surfaces of the support member 140 arranged opposite each other along the thickness direction, the surface facing the electrode assembly 130 is the first surface 1403, and the surface facing the first wall 113 is the second surface 1404. The support member 140 is in direct contact with the first end face 1301. The first opening 1402 is formed on the first surface 1403, and the outer peripheral surface connecting the first surface 1403 and the second surface 1404 is the side surface 1405. One or more receiving grooves 1401 penetrate the side surface 1405, and the opening formed by one receiving groove 1401 penetrating the side surface 1405 is the second opening 1406.

[0447] For example, side 1405 includes a first side 14051, a second side 14052, a third side 14053, and a fourth side 14054. The first side 14051 and the second side 14052 are distributed opposite to each other along the width direction of the support member 140, and the third side 14053 and the fourth side 14054 are distributed opposite to each other along the length direction of the support member 140. One or more receiving grooves 1401 may penetrate at least one of the first side 14051, the second side 14052, the third side 14053, and the fourth side 14054.

[0448] By adopting the technical solution of this embodiment, the provision of the second opening 1406 allows the electrolyte outside the support member 140 and the electrode assembly 130 to flow into the receiving tank 1401 from the second opening 1406, and then flow to the first end face 1301 through the receiving tank 1401 and the first opening 1402, which effectively improves the wetting effect of the electrode assembly 130 and improves the cycle performance of the battery cell 100.

[0449] See Figure 8 , Figures 25-27 As shown, in some embodiments, at least one side of the first end face 1301 protrudes from the side face 1405 and forms a receiving space 1001, and the second opening 1406 communicates with the receiving space 1001.

[0450] In some examples, the number of electrode assemblies 130 may be one, and the edge of the first end face 1301 protrudes from at least one of the first side face 14051, the second side face 14052, the third side face 14053 and the fourth side face 14054.

[0451] For example, the first end face 1301 protrudes from the first side surface 14051 and the second side surface 14052 on opposite sides along the width direction of the support member 140; the first end face 1301 protrudes from the third side surface 14053 and the fourth side surface 14054 on opposite sides along the length direction of the support member 140; an annular space can be formed on the outer side of the support member 140, which is the receiving space 1001.

[0452] In some examples, there may be multiple electrode assemblies 130, which are stacked along the width direction of the support 140. The side of the first end face 1301 of the outermost electrode assembly 130 protrudes from at least one of the first side face 14051 and the second side face 14052, and the side of the first end face 1301 of at least one electrode assembly 130 protrudes from at least one of the third side face 14053 and the fourth side face 14054.

[0453] For example, there may be multiple electrode assemblies 130, which are stacked along the width direction of the support member 140. The first end faces 1301 of the two outermost electrode assemblies 130 protrude from the first side face 14051 and the second side face 14052, respectively. The first end faces 1301 of the multiple electrode assemblies 130 protrude from the opposite sides of the support member 140 along the length direction of the support member 140, respectively, from the third side face 14053 and the fourth side face 14054. The length of the electrode assembly 130 is greater than the length of the support member 140, and the sum of the thicknesses of the multiple electrode assemblies 130 is greater than the width of the support member 140. An annular space may be formed on the outer side of the support member 140, which is the receiving space 1001.

[0454] In some examples, the electrode assembly 130 is covered with a first insulating member 150. The space formed by the inner surface of the first insulating member 150, the outer peripheral surface of the support member 140, and the first end face 1301 is a receiving space 1001. The receiving space 1001 is connected to the second opening 1406. The electrolyte in the receiving space 1001 can flow into the receiving tank 1401 through the second opening 1406.

[0455] By adopting the technical solution of this embodiment, the electrolyte located in the receiving space 1001 can enter the receiving tank 1401 through the second opening 1406, and then flow to the end of the first electrode 131 through the receiving tank 1401 and the first opening 1402, thereby improving the wetting effect of the first electrode 131 and improving the cycle performance of the battery cell 100. In particular, when the bottom wall of the housing 110 is the first wall 113, the electrolyte can accumulate in the receiving space 1001, and the electrolyte in the receiving space 1001 can wet the first electrode 131 through the receiving tank 1401 and wet upward along the first electrode 131, which can effectively improve the wetting effect of the electrode assembly 130 and improve the cycle performance of the battery cell 100.

[0456] See Figure 8 , Figure 15 and Figure 16 As shown, in some embodiments, at least one receiving groove 1401 extends through at least one end of the side surface 1405 along a first direction X and forms a second opening 1406, where the first direction X is the width direction of the support member 140.

[0457] The opening formed by the receiving groove 1401 penetrating the side 1405 is the second opening 1406. One end of the receiving groove 1401 penetrating the side 1405 can form one second opening 1406. Both ends of the receiving groove 1401 penetrating the side 1405 can form two second openings 1406.

[0458] For example, the first groove 14011 extends along the first direction X, one end of one or more first grooves 14011 penetrates the first side surface 14051, or the other end of one or more first grooves 14011 penetrates the second side surface 14052, or the two ends of one or more first grooves 14011 respectively penetrate the first side surface 14051 and the second side surface 14052.

[0459] By adopting the technical solution of this embodiment, the electrolyte can enter the receiving tank 1401 through the second opening 1406 formed on the side 1405 of the receiving tank 1401, and then flow along the receiving tank 1401 to the first end face 1301, thereby wetting the first electrode 131, improving the wetting effect of the first electrode 131, and improving the cycle performance of the battery cell 100.

[0460] See Figure 7 and Figure 8 As shown, in some embodiments, the width of the support 140 is W along the first direction X, and the dimensions of all electrode assemblies 130 are T1, where 0.9 ≤ W / T1 < 1.

[0461] In some examples, T1 may be the sum of the thicknesses of all electrode assemblies 130, and W may be the width of the support 140.

[0462] When W / T1 < 1, it can be understood that the sum of the thicknesses of all electrode assemblies 130 is greater than the width of the support 140. The support 140 forms receiving spaces 1001 on both sides along its width. The electrolyte in the receiving spaces 1001 flows into the receiving tank 1401 through the second opening 1406, and then flows into the first end face 1301 through the receiving tank 1401, thereby wetting the electrode assemblies 130, improving the wetting effect of the electrode assemblies 130, and improving the cycle performance of the battery cell 100. Furthermore, the support 140 does not protrude beyond the electrode assemblies 130 along the first direction X, which also helps to improve the energy density of the battery cell 100. When W / T1 ≥ 0.9, the support 140 can better support the electrode assemblies 130, which helps to reduce stress concentration in the electrode assemblies 130 and improve the reliability of the battery cell 100.

[0463] The value of W / T1 can be 0.9 or any number between 0.9 and 1; for example, the value of W / T1 can be, but is not limited to, 0.9, 0.92, 0.94, 0.96, 0.98, and 0.99.

[0464] By adopting the technical solution of this embodiment, along the first direction X, the electrode assembly 130 protrudes from the opposite sides of the support member 140, and the opposite sides of the support member 140 can form a receiving space 1001. The electrolyte in the receiving space 1001 can flow into the receiving tank 1401 through the second opening 1406, and then flow into the first end face 1301 through the receiving tank 1401, thereby wetting the first electrode 131, improving the wetting effect of the first electrode 131, and improving the cycle performance of the battery cell 100. In addition, the support member 140 can better support the electrode assembly 130, improving the reliability of the battery cell 100.

[0465] See Figures 24-27 As shown, in some embodiments, at least one receiving groove 1401 extends through at least one end of the side surface 1405 along the second direction Y and forms a second opening 1406, the second direction Y being the length direction of the support member 140.

[0466] For example, the first groove 14011 extends along the second direction Y, one end of one or more first grooves 14011 penetrates the third side surface 14053, or the other end of one or more first grooves 14011 penetrates the fourth side surface 14054, or the two ends of one or more first grooves 14011 respectively penetrate the third side surface 14053 and the fourth side surface 14054.

[0467] By adopting the technical solution of this embodiment, the electrolyte can enter the receiving tank 1401 through the second opening 1406 formed on the side 1405 of the receiving tank 1401, and then flow along the receiving tank 1401 to the first end face 1301, thereby wetting the first electrode 131, improving the wetting effect of the first electrode 131, and improving the cycle performance of the battery cell 100.

[0468] In some embodiments, along the second direction Y, the electrode assembly 130 has a dimension of L1 and the support member 140 has a length of L2, wherein 0.95 ≤ L2 / L1 < 1.

[0469] L1 can be the length of the electrode assembly 130, and W can be the length of the support member 140.

[0470] With L2 / L1 < 1, it can be understood that the length of the electrode assembly 130 is greater than the length of the support member 140. The support member 140 can form receiving spaces 1001 on both sides along its length. The electrolyte in the receiving spaces 1001 can flow into the receiving tank 1401 through the second opening 1406, and then into the first end face 1301 through the receiving tank 1401, thereby wetting the first electrode 131, improving the wetting effect of the first electrode 131, and improving the cycle performance of the battery cell 100. Furthermore, along the second direction Y, the support member 140 does not protrude beyond the electrode assembly 130, which also helps to improve the energy density of the battery cell 100. With L2 / L1 ≥ 0.95, the support member 140 can better support the electrode assembly 130, which helps to reduce stress concentration in the electrode assembly 130 and improve the reliability of the battery cell 100.

[0471] The value of L2 / L1 can be 0.95 or any number between 0.95 and 1; for example, the value of L2 / L1 can be, but is not limited to, 0.95, 0.96, 0.98, and 0.99.

[0472] By adopting the technical solution of this embodiment, along the second direction Y, the electrode assembly 130 protrudes from the opposite sides of the support member 140, and the opposite sides of the support member 140 can form a receiving space 1001. The electrolyte in the receiving space 1001 can flow into the receiving tank 1401 through the second opening 1406, and then flow into the first end face 1301 through the receiving tank 1401, thereby wetting the first electrode 131, improving the wetting effect of the first electrode 131, and improving the cycle performance of the battery cell 100. In addition, the support member 140 can better support the electrode assembly 130, improving the reliability of the battery cell 100.

[0473] See Figure 28 As shown, in some embodiments, along the first direction X, the ends of two adjacent first branches 141 located on the same side are connected by a connecting portion 142, and the ends of two adjacent first branches 141 located on the other side are connected by a connecting portion 142.

[0474] For example, two connecting parts 142 are arranged parallel to each other along the first direction X, and two adjacent first branches 141 are arranged at intervals along the second direction Y, with the two adjacent first branches 141 connected between the two connecting parts 142.

[0475] By adopting the technical solution of this embodiment, each of the two adjacent first branches 141 is connected to a connecting portion 142 at both ends along the first direction X, which improves the structural strength of the support member 140 and is beneficial to improving the reliability of the battery cell 100.

[0476] See Figure 29 As shown, in some embodiments, the support member 140 has a first surface 1403 and a second surface 1404 disposed opposite to each other along its own thickness direction. The first surface 1403 is disposed facing the first end surface 1301, and the second surface 1404 is disposed away from the first end surface 1301. A first opening 1402 is located on the first surface 1403, and at least one receiving groove 1401 penetrates the second surface 1404 to form a third opening 1407.

[0477] One or more receiving grooves 1401 penetrate the support member 140 along the thickness direction Z. The opening formed by one receiving groove 1401 on the second surface 1404 is the third opening 1407. The shape of the first opening 1402 and the shape of the third opening 1407 may be the same or different.

[0478] By adopting the technical solution of this embodiment, the electrolyte can flow into the receiving tank 1401 from the third opening 1407, which improves the wetting effect of the electrode assembly 130 and is beneficial to improving the cycle performance of the battery cell 100.

[0479] In some embodiments, the battery cell 100 includes a first insulating member 150, at least a portion of which is located within the housing 110. The first insulating member 150 has a receiving space 1501. At least a portion of the electrode assembly 130 and the support member 140 are both located in the receiving space 1501. The first insulating member 150 has a first through hole 1511 communicating with the receiving space 1501 and the outside of the first insulating member 150.

[0480] The first insulating element 150 can refer to a component covering the electrode assembly 130. The first insulating element 150 is made of insulating material, such as polypropylene, polyethylene, polyethylene terephthalate, etc. The first insulating element 150 can be called a Mylar film. The first insulating element 150 can cover the electrode assembly 130 by folding or wrapping. The inner cavity formed by the first insulating element 150 is a receiving space 1501. The entire electrode assembly 130 can be located in the receiving space 1501, or a part of the electrode assembly 130 can be located in the receiving space 1501, and the tabs 1304 of the electrode assembly 130 can be located outside the receiving space 1501. The support member 140 is located in the receiving space 1501.

[0481] For example, the first insulating member 150 and the support member 140 may be separate components, that is, the first insulating member 150 and the support member 140 are individually molded and then assembled together.

[0482] The first insulating member 150 has a first through hole 1511 in its wall portion. The first through hole 1511 penetrates the wall portion of the first insulating member 150, thereby connecting the outside of the first insulating member 150 and the receiving space 1501. The number of first through holes 1511 can be one or more. Multiple first through holes 1511 can be located in different wall portions of the first insulating member 150 or in the same wall portion.

[0483] In some cases, the support member 140 is located outside the first insulator 150, and the first end face 1301 of the electrode assembly 130 directly abuts against the first insulator 150. The support member 140 is located between the first wall 113 and the first insulator 150. In this way, more electrolyte accumulates in the space on the side of the support member 140, that is, more electrolyte accumulates outside the first insulator 150. However, the external electrolyte does not easily penetrate the first insulator 150 and wet the electrode assembly 130, which is not conducive to improving the cycle performance of the battery cell 100.

[0484] By adopting the technical solution of this embodiment, the electrolyte can enter the receiving space 1501 through the first through hole 1511 to wet the electrode assembly 130, which is beneficial to improve the wetting effect of the electrode assembly 130 and improve the cycle performance of the battery cell 100. In addition, the support member 140 is located inside the first insulating member 150 and the support member 140 has a receiving groove 1401. A large amount of electrolyte will accumulate in the space between the receiving groove 1401 and the side of the support member 140. The electrolyte in the receiving groove 1401 will wet the electrode assembly 130 through the first opening 1402, which improves the wetting performance of the electrode assembly 130 and improves the cycle performance of the battery cell 100.

[0485] In some embodiments, the first insulating member 150 has a second wall 151, at least a portion of which is located between the support member 140 and the first wall 113. The second wall 151 is provided with a first through hole 1511, which penetrates the second wall 151 along the thickness direction Z of the support member 140. The projection of the first through hole 1511 along the thickness direction Z of the support member 140 does not coincide with the projection of all the third openings 1407.

[0486] The portion of the first insulating member 150 located between the support member 140 and the first wall 113 is the second wall 151. The second wall 151 may be located entirely between the support member 140 and the first wall 113, or it may be located partially between the support member 140 and the first wall 113.

[0487] The second wall 151 is provided with a first through hole 1511, and the first through hole 1511 penetrates the second wall 151 along the thickness direction Z of the support member 140. Along the thickness direction Z of the support member 140, the first through hole 1511 is offset from the projection of all the third openings 1407.

[0488] By adopting the technical solution of this embodiment, the first through hole 1511 penetrates the second wall 151, and the electrolyte outside the first insulating member 150 can enter the first insulating member 150 through the first through hole 1511, thereby wetting the electrode assembly 130 and improving the cycle performance of the battery cell 100; the third opening 1407 and the first through hole 1511 are staggered, so that the second wall 151 can block the active material falling from the electrode assembly 130, reduce the risk of the falling active material coming into contact with the first wall 113, reduce the risk of the falling active material corroding the casing 110, and improve the reliability of the battery cell 100.

[0489] See Figure 30 and Figure 31 As shown, in some embodiments, the support member 140 further includes a base plate 144, a plurality of first branches 141 are arranged at intervals along the second direction Y, the base plate 144 is located between the first end face 1301 and the first wall 113, and the plurality of first branches 141 are connected to the surface of the base plate 144 facing the first end face 1301.

[0490] The substrate 144 can refer to the plate structure in the support member 140 located on the first branch 141 facing away from the electrode assembly 130. The substrate 144 can provide a mounting base for the first branch 141 and play the role of supporting the first branch 141. The substrate 144 and the first branch 141 can be manufactured as a single piece through a molding process such as injection molding or machining. Alternatively, the first branch 141 and the substrate 144 can be molded separately and then assembled together.

[0491] In some examples, the support member 140 includes a connecting portion 142 connected to the substrate 144, with both ends of the connecting portion 142 connected to the middle of two adjacent first branches 141; two first grooves 14011 are formed between the two adjacent first branches 141, and the two first grooves 14011 are respectively located on opposite sides of the connecting portion 142 along the first direction X.

[0492] By adopting the technical solution of this embodiment, the provision of substrate 144 can increase the structural strength of support member 140 and improve the reliability of battery cell 100. In addition, substrate 144 can also close the opening of the first groove 14011 facing away from electrode assembly 130 to prevent active material falling from electrode assembly 130 from passing through support member 140, reduce problems such as electrochemical corrosion of casing 110, and also help improve the structural reliability of battery cell 100.

[0493] See Figure 32 As shown, in some embodiments, at least a portion of the surface of at least one first branch 141 facing the first end face 1301 is an arc surface.

[0494] One or more first branches 141 may have a portion of their surface facing the electrode assembly 130 that is an arc surface, or the entire surface of one or more first branches 141 facing the electrode assembly 130 may be an arc surface. The arc surface may be a circular arc surface, an elliptical arc surface, etc.

[0495] In some examples, the upper surface of the first branch 141 is connected to the left and right surfaces of the first branch 141 by a smooth transition through an arc surface; wherein, the upper surface of the first branch 141 can be a plane or a line.

[0496] By adopting the technical solution of this embodiment, the arc surface setting can reduce the contact area between the first end face 1301 and the support member 140, increase the contact area between the electrolyte in the receiving groove 1401 and the first end face 1301, improve the wetting effect of the electrode assembly 130, and improve the cycle performance of the battery cell 100.

[0497] In some embodiments, at least a portion of the surface of at least one connecting portion 142 facing the first end face 1301 is an arc surface.

[0498] One or more connecting portions 142 may have a portion of their surface facing the electrode assembly 130 that is curved, or the entire surface of one or more connecting portions 142 facing the electrode assembly 130 may be curved. The curved surface may be a circular arc surface, an elliptical arc surface, etc.

[0499] In some examples, the upper surface of the connecting part 142 is smoothly connected to the front and rear surfaces of the connecting part 142 by a curved surface; wherein, the upper surface of the connecting part 142 can be a plane or a line.

[0500] By adopting the technical solution of this embodiment, the arc surface setting can reduce the contact area between the first end face 1301 and the support member 140, increase the contact area between the electrolyte in the receiving groove 1401 and the first end face 1301, improve the wetting effect of the electrode assembly 130, and improve the cycle performance of the battery cell 100.

[0501] See Figure 15 As shown, in some embodiments, a second through hole 1408 is provided at least one end of the support member 140 along the second direction Y, the second through hole 1408 penetrates the support member 140 along the thickness direction Z of the support member 140, the first branch 141 is provided with the second through hole 1408; and / or, the connecting portion 142 is provided with the second through hole 1408.

[0502] In some examples, the second through hole 1408 penetrates the support member 140 along the thickness direction Z, and the second through hole 1408 penetrates the first surface 1403 and the second surface 1404 to form an opening. The support member 140 is provided at one end along the second direction Y, or the support member 140 is provided at both opposite ends along the second direction Y. The second through hole 1408 is provided at the first branch 141 or the connecting portion 142 located at the end of the support member 140 along the second direction Y.

[0503] For example, the first branch 141 and the connecting portion 142 located at the same end or different ends of the support member 140 along the second direction Y are both provided with a second through hole 1408.

[0504] For example, the second through holes 1408 located at both ends of the support member 140 have different shapes, which can easily distinguish the two ends of the support member 140 along the second direction Y, so as to facilitate the assembly of the first insulating member 150.

[0505] In some examples, along the second direction Y, any one of the first three first branches 141 is provided with a second through hole 1408; any one of the last three first branches 141 is provided with a second through hole 1408.

[0506] For example, along the second direction Y, the first branch 141 is provided with a second through hole 1408; the last branch 141 is provided with a second through hole 1408.

[0507] In some examples, along the second direction Y, any one of the first three connecting parts 142 is provided with a second through hole 1408; any one of the last three connecting parts 142 is provided with a second through hole 1408.

[0508] For example, along the second direction Y, the first connecting part 142 is provided with a second through hole 1408; the last connecting part 142 is provided with a second through hole 1408.

[0509] By adopting the technical solution of this embodiment, the second through hole 1408 can be used to distinguish the two ends of the support member 140 along the second direction Y by utilizing the differences in shape and position of the second through hole 1408, so as to facilitate the assembly of the first insulating member 150.

[0510] See Figure 33 As shown, in some embodiments, the support member 140 further includes a substrate 144 and a plurality of spaced protrusions 145; the substrate 144 is located between the first end face 1301 and the first wall 113, and the plurality of protrusions 145 are connected to the surface of the substrate 144 facing the first end face 1301, and the plurality of protrusions 145 and the substrate 144 form at least one receiving groove 1401.

[0511] The substrate 144 can refer to the main body of the support member 140. The surface of the substrate 144 facing the electrode assembly 130 is provided with a protruding structure, which is a protrusion 145. There can be multiple protrusions 145. Multiple protrusions 145 can be arranged regularly on the surface of the substrate 144 or arranged randomly on the surface of the substrate 144.

[0512] The structure of the protrusion 145 can be various, such as a circular column structure or a polygonal column structure.

[0513] By adopting the technical solution of this embodiment, the support member 140 adopts the structure of a substrate 144 and a protrusion 145. The protrusion 145 supports the electrode assembly 130, which helps to reduce the contact area between the support member 140 and the electrode assembly 130, improves the wetting effect of the electrode assembly 130, and improves the cycle performance of the battery cell 100. The support member 140 can form a well-connected receiving groove 1401, which helps to improve the wetting effect of the electrode assembly 130 and improve the cycle performance of the battery cell 100. In addition, the structure of the support member 140 is simple and the processing and manufacturing are more convenient.

[0514] In some embodiments, there are multiple receiving grooves 1401, and multiple protrusions 145 are arranged in a matrix to form multiple receiving grooves 1401 arranged in a crisscross pattern.

[0515] For example, the plurality of receiving grooves 1401 include a first groove 14011 and a second groove 14012. The first groove 14011 extends along a first direction X, and the second groove 14012 extends along a second direction Y. There are multiple first grooves 14011 and multiple second grooves 14012. The plurality of first grooves 14011 and the plurality of second grooves 14012 intersect and communicate with each other, thereby forming a mesh structure.

[0516] By adopting the technical solution of this embodiment, the support member 140 forms a plurality of accommodating grooves 1401 arranged in a crisscross pattern. The plurality of accommodating grooves 1401 arranged in a crisscross pattern are interconnected, which is beneficial to improving the wetting effect of the electrode assembly 130 and improving the cycle performance of the battery cell 100. In addition, the support member 140 has a simple structure and is more convenient to process and manufacture.

[0517] In some embodiments, at least a portion of the surface of at least one protrusion 145 facing the first end face 1301 is an arc surface.

[0518] In some examples, the upper surface of the protrusion 145 and the outer peripheral surface of the protrusion 145 are connected by a smooth transition through an arc surface; wherein, the upper surface of the protrusion 145 can be a plane or a point.

[0519] By adopting the technical solution of this embodiment, the surface of the protrusion 145 facing away from the substrate 144 can be an arc surface to increase the contact area between the electrolyte and the first end face 1301, improve the wetting effect of the electrode assembly 130, and improve the cycle performance of the battery cell 100.

[0520] See Figure 31 As shown, in some embodiments, the size of the substrate 144 ranges from 0.1 mm to 1 mm along the thickness direction Z of the support 140.

[0521] Along the thickness direction Z of the support member 140, the size of the substrate 144 is t, where t is the thickness of the substrate 144.

[0522] t can be 0.1mm, 1mm, or any number between 0.1mm and 1mm; for example, t can be, but is not limited to, 0.1mm, 0.2mm, 0.5mm, 0.8mm, or 1mm.

[0523] By adopting the technical solution of this embodiment, the support member 140 has good structural strength, so as to better support the electrode assembly 130; in addition, the substrate 144 occupies little space, which is beneficial to improving the volumetric energy density of the battery cell 100.

[0524] In some embodiments, the thickness of the support member 140 ranges from 0.1 mm to 3 mm.

[0525] The thickness of the support member 140 is T; T can be 0.1 mm, 3 mm or any number between 0.1 mm and 3 mm; for example, T can be, but is not limited to, 0.1 mm, 0.2 mm, 0.5 mm, 0.8 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm or 3 mm.

[0526] By adopting the technical solution of this embodiment, the support member 140 has good structural strength, so as to better support the electrode assembly 130; in addition, the support member 140 occupies little space, which is beneficial to improving the volumetric energy density of the battery cell 100.

[0527] In some embodiments, the support member 140 has a first surface 1403, which is disposed facing the first end surface 1301, and a first opening 1402 is located on the first surface 1403; the area of ​​the first surface 1403 is S1, and the area of ​​the first opening 1402 of all the receiving slots 1401 is S2, 0.1≤S2 / (S1+S2)≤0.8.

[0528] The first surface 1403 can refer to the surface of the support member 140 that contacts the first end face 1301. The first surface 1403 is used to support the electrode assembly 130. The first surface 1403 can also be called the support area. All the first openings 1402 form the hollow area of ​​the first surface 1403. The support area and the hollow area together form a total area. S2 / (S1+S2) can refer to the area ratio of the support area in the total area.

[0529] For example, the support member 140 is rectangular, and S1+S2 is equal to the length of the support member 140 multiplied by its width.

[0530] The value of S2 / (S1+S2) can be 0.1, 0.8, or any number between 0.1 and 0.8; for example, the value of S2 / (S1+S2) can be, but is not limited to, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, or 0.8.

[0531] By adopting the technical solution of this embodiment, with the setting of 0.1≤S2 / (S1+S2)≤0.8, the support member 140 can better support the electrode assembly 130, and also enables the receiving tank 1401 to hold more electrolyte or the electrolyte to flow into the electrode assembly 130 through the receiving tank 1401 at a better flow rate, thereby improving the wetting effect of the electrode assembly 130 and improving the cycle performance of the battery cell 100.

[0532] In some embodiments, 0.4 ≤ S2 / (S1+S2) ≤ 0.7.

[0533] By adopting the technical solution of this embodiment, the reliability and cycle performance of the battery cell 100 can be better balanced.

[0534] In some embodiments, the support member 140 is an insulating component.

[0535] The support 140 is an insulating component, and the support 140 is made of insulating materials, such as polypropylene, polyphenylene sulfide, epoxy resin, etc.

[0536] By adopting the technical solution of this embodiment, the support member 140 can insulate and separate the first wall 113 and the electrode assembly 130, which can reduce the risk of short circuit in the battery cell 100 and improve the reliability of the battery cell 100.

[0537] In some embodiments, the battery cell 100 includes a first insulating member 150, at least a portion of which is located within the housing 110. The first insulating member 150 has a receiving space 1501, at least a portion of the electrode assembly 130 and the support member 140 are both located within the receiving space 1501. The first insulating member 150 has a second wall 151, at least a portion of which is located between the support member 140 and the first wall 110. The support member 140 and the second wall 151 are integrally formed.

[0538] The second wall 151 of the first insulating component 150 and the support component 140 are manufactured using integrated molding processes such as injection molding and die casting.

[0539] By adopting the technical solution of this embodiment, the second wall 151 of the first insulating member 150 is integrally formed with the support member 140, which can save manufacturing processes and improve production efficiency.

[0540] See Figure 34 and Figure 35 As shown, in some embodiments, the battery cell 100 has a third through hole 1002, which penetrates the support 140 and the second wall 151 along the thickness direction Z of the support 140.

[0541] The third through hole 1002 can penetrate the second wall 151 and the support member 140 along the thickness direction Z of the support member 140, and the number of the third through holes 1002 can be one or more.

[0542] For example, the third through hole 1002 penetrates the second wall 151 and the first branch 141 along the thickness direction Z of the support member 140.

[0543] For example, the third through hole 1002 penetrates the second wall 151 and the connecting portion 142 along the thickness direction Z of the support member 140.

[0544] By adopting the technical solution of this embodiment, the electrolyte located outside the first insulating member 150 can directly wet the electrode assembly 130 through the third through hole 1002, thereby improving the wetting effect of the electrode assembly 130 and improving the cycle performance of the battery cell 100.

[0545] See Figures 6-8As shown, in some embodiments, the battery cell 100 includes a first insulating member 150, at least a portion of which is located within the housing 110. The first insulating member 150 has a receiving space 1501, at least a portion of the electrode assembly 130 and the support member 140 are both located in the receiving space 1501.

[0546] By adopting the technical solution of this embodiment, the first insulating member 150 can insulate and separate the electrode assembly 130 and the housing 110, which is beneficial to improving the reliability of the battery cell 100.

[0547] See Figures 6-8 As shown, in some embodiments, the battery cell 100 includes a second insulating member 170, at least a portion of which is located on the side of the end cap 120 facing the electrode assembly 130, and a first insulating member 150 is connected to the second insulating member 170.

[0548] The second insulating component 170 can also refer to a part located on the side of the end cap 120 facing the electrode assembly 130. The second insulating component 170 is made of insulating material, such as polypropylene, polyphenylene sulfide, etc. The second insulating component 170 can also be referred to as the lower plastic.

[0549] For example, the first insulating member 150 covers the electrode assembly 130 and can form a receiving space 1501. The end of the receiving space 1501 facing away from the first wall 113 has an opening, and the second insulating member 170 can be located in the opening. The first insulating member 150 is arranged around the periphery of the second insulating member 170, and the end of the first insulating member 150 near the opening can be fixedly connected to the second insulating member 170 by means of welding or bonding.

[0550] By adopting the technical solution of this embodiment, the second insulating member 170 can insulate and separate the electrode assembly 130 and the end cap 120, which can reduce the risk of short circuit in the electrode assembly 130 and improve the reliability of the battery cell 100.

[0551] See Figure 4 As shown, in some embodiments, the battery cell 100 includes an electrode terminal 160 and a second insulator 170. The electrode terminal 160 is disposed on the end cap 120 and is electrically connected to the electrode assembly 130. At least a portion of the second insulator 170 is located on the side of the end cap 120 facing the electrode assembly 130, and the second insulator 170 insulates and separates the electrode terminal 160 and the end cap 120.

[0552] Electrode terminal 160 can refer to the component that electrically connects the battery cell 100 to the external circuit. Electrode terminal 160 can be fixedly connected to end cover 120 by means of screwing, snap-fitting, etc. A part of the second insulating member 170 can be disposed between end cover 120 and electrode assembly 130, and another part of the second insulating member 170 can be located between end cover 120 and electrode terminal 160, thereby achieving insulation between electrode terminal 160 and end cover 120.

[0553] The electrode terminal 160 is divided into a positive electrode terminal 161 and a negative electrode terminal 162. The positive electrode terminal 161 and the negative electrode terminal 162 are electrically connected to the positive tab 1305 and the negative tab 1306 of the electrode assembly 130, respectively, thereby realizing the charging and discharging of the battery cell 100.

[0554] In some examples, there is only one end cap 120, and the positive electrode terminal 161 and the negative electrode terminal 162 can be provided on the end cap 120 to facilitate electrical connection with external circuits.

[0555] In some examples, there are two end caps 120, with the positive electrode terminal 161 and the negative electrode terminal 162 disposed on two separate end caps 120; or, the positive electrode terminal 161 and the negative electrode terminal 162 are disposed on one of the end caps 120.

[0556] By adopting the technical solution of this embodiment, the second insulating member 170 can insulate and separate the electrode assembly 130 and the end cap 120, as well as the end cap 120 and the electrode terminal 160, thereby reducing the risk of short circuit in the battery cell 100 and improving the reliability of the battery cell 100.

[0557] In some embodiments, the housing 110 is an insulating housing.

[0558] The insulating shell is made of insulating materials, such as polypropylene, polyphenylene sulfide, epoxy resin, etc.

[0559] By adopting the technical solution of this embodiment, the insulating shell itself has insulating properties, which can realize the insulation between the shell 110 and the electrode assembly 130, which is beneficial to eliminate the first insulating component 150 and improve the energy density of the battery cell 100.

[0560] In some embodiments, the inner wall of the housing 110 is covered with an insulating coating.

[0561] The insulating coating can be made of various materials, such as ceramic-based insulating coatings, polyimide coatings, and fluorinated ethylene propylene copolymer coatings.

[0562] By adopting the technical solution of this embodiment, the insulating coating can insulate and separate the housing 110 and the electrode assembly 130, which is beneficial to eliminate the first insulating component 150 and improve the energy density of the battery cell 100.

[0563] In some embodiments, see Figures 6-14 As shown, the electrode assembly 130 includes a second electrode 132 and an isolator 133. The first electrode 131 and the second electrode 132 have different polarities. A portion of the isolator 133 is located between the first electrode 131 and the second electrode 132. The end of the isolator 133 facing the support member 140 extends beyond the first electrode 131 and the second electrode 132. The end of the isolator 133 facing the support member 140 is bent to form a stacked structure and a first end face 1301.

[0564] The second electrode 132 has the opposite polarity to the first electrode 131. The first electrode 131 is the positive electrode 134, and the second electrode 132 is the negative electrode 135; or, the first electrode 131 is the negative electrode 135, and the second electrode 132 is the positive electrode 134.

[0565] The isolator 133 is located between the first electrode 131 and the second electrode 132 to insulate and separate the first electrode 131 and the second electrode 132. A portion of the isolator 133 is located between the first electrode 131 and the second electrode 132. The end of the isolator 133 near the support 140 can extend between the first electrode 131 and the second electrode 132. The end of the isolator 133 extending between the first electrode 131 and the second electrode 132 is bent to form a first end face 1301.

[0566] In some examples, see Figure 8 and Figure 9 As shown, the electrode assembly 130 has a wound structure. The end of the spacer 133 extending between the first electrode 131 and the second electrode 132 is bent to form an overlap between the ends of two adjacent turns of the spacer 133, thus forming a stacked structure.

[0567] In some examples, see Figure 8 and Figure 10 As shown, the electrode assembly 130 has a stacked structure, and there are multiple isolation members 133. After the ends of the multiple isolation members 133 extending between the first electrode 131 and the second electrode 132 are bent, the ends of the adjacent two layers of isolation members 133 will overlap together, thereby forming a stacked structure.

[0568] In some examples, see Figures 12-14 As shown, the isolation members 133 are continuously arranged, and the isolation members 133 are folded to form multiple isolation segments 1332. After the ends of the multiple isolation segments 1332 extending between the first electrode 131 and the second electrode 132 are bent, the ends of two adjacent isolation segments 1332 will overlap together to form a stacked structure.

[0569] In some cases, the stacked structure is located between the first electrode 131 and the support 140, with the electrode assembly 130 abutting against the support 140. This makes the stacked structure more compact, which makes it difficult for the electrolyte to flow from the adjacent layers within the stacked structure to the first electrode 131 and the second electrode 132, which is not conducive to improving the cycle performance of the battery cell 100.

[0570] By adopting the technical solution of this embodiment, the support member 140 has a receiving groove 1401, and the position of the stacked structure opposite to the first opening 1402 is suspended. Therefore, the suspended part of the stacked structure is relatively loose, and the electrolyte can flow through the loose part of the stacked structure to the first electrode 131 and the second electrode 132, thereby improving the wetting effect of the electrode assembly 130 and improving the cycle performance of the battery cell 100. In addition, the electrolyte can also directly pass through the separator 133 and extend out of the ends of the first electrode 131 and the second electrode 132. The fluid flows to the first electrode 131 and the second electrode 132, improving the wetting effect of the first electrode 131 and the second electrode 132 and improving the cycle performance of the battery cell 100; the separator 133 extends from the end of the support member 140 between the first electrode 131 and the second electrode 132, so that the separator 133 can insulate and separate the ends of the first electrode 131 and the second electrode 132 near the support member 140, reducing the short circuit risk of the electrode assembly 130 and improving the reliability of the battery cell 100.

[0571] See Figure 36 As shown, in some embodiments, the electrode assembly 130 includes a flat portion 1302, the portion of the first electrode 131 located in the flat portion 1302 includes a first electrode layer 1311, the portion of the second electrode 132 located in the flat portion 1302 includes a second electrode layer 1321, and the portion of the separator 133 located in the flat portion 1302 includes a separator layer 1331; the number of first electrode layers 1311, second electrode layers 1321, and separator layers 1331 are all multiple; each separator layer 1331 includes a main body portion 13311 and a bent portion 13312, the main body portion... At least a portion of 13311 is located between adjacent first electrode layers 1311 and second electrode layers 1321. The end of the main body 13311 facing the support member 140 is connected to the bent portion 13312. The bent portion 13312 is entirely located outside the corresponding adjacent first electrode layers 1311 and first electrode layers 1311. The bent portion 13312 is bent relative to the main body 13311. The bent portions 13312 of two adjacent isolation layers 1331 are stacked, and a gap 1333 is formed between the bent portions 13312 of two adjacent isolation layers 1331.

[0572] In some examples, see Figure 8 and Figure 9As shown, the electrode assembly 130 has a wound structure and a flat structure. The flat portion of the electrode assembly 130 is the flat section 1302. The portion of the second electrode 132 located within the flat section 1302 is arranged in a basically flat manner. The flat structure of the second electrode 132 located within the flat section 1302 is the second electrode layer 1321. The second electrode 132 can be wound more than once to form multiple second electrode layers 1321. The portion of the insulating member 133 located within the flat section 1302 is arranged in a basically flat manner. The flat structure of the insulating member 133 located within the flat section 1302 is the insulating layer 1331. The insulating layer 1331 can be wound more than once to form multiple insulating layers 1331.

[0573] The electrode assembly 130 also includes a bent portion 1303. Both ends of the straight portion 1302 are connected to the bent portion 1303. The bent portion 1303 is the part of the electrode assembly 130 with a bent structure. The portion of the second electrode 132 located within the bent portion 1303 is basically curved. For example, the portion of the second electrode 132 located within the bent portion 1303 is a semi-circular arc structure or a structure similar to a semi-circular arc. The portion of the spacer 133 located within the bent portion 1303 is basically curved. For example, the portion of the spacer 133 located within the bent portion 1303 is a semi-circular arc structure or a structure similar to a semi-circular arc.

[0574] In some examples, see Figure 10 As shown, the electrode assembly 130 has a stacked structure and the electrode assembly 130 as a whole has a flat structure. The second electrode 132 is located in a flat structure within the flat portion 1302, which is the second electrode layer 1321. There are multiple second electrode 132s, and one second electrode 132 is one second electrode layer 1321.

[0575] In some examples, see Figure 14 As shown, there is one second electrode 132, which is folded to form multiple second electrode layers 1321.

[0576] In some examples, see Figure 10 As shown, the isolation member 133 is located in a straight structure within the straight portion 1302, which is an isolation layer 1331; there are multiple isolation members 133, and one isolation member 133 forms one isolation layer 1331.

[0577] In some examples, see Figure 13 and Figure 14 As shown, the isolation element 133 is folded to form multiple isolation segments 1332, and each isolation segment 1332 is an isolation layer 1331.

[0578] The insulating layer 1331 comprises two parts: a main body 13311 located between the first electrode layer 1311 and the second electrode layer 1321, and a bent portion 13312 connected to the end of the main body 13311 near the support member 140. The bent portion 13312 is bent relative to the main body 13311 and is located between the negative electrode 135 and the support member 140. The bent portion 13312 and the main body 13311 are separated by the end face of the negative electrode 135 facing the support member 140. The bent portions 13312 of multiple insulating layers 1331 are bent relative to the main body 13311 to form a stacked structure.

[0579] A gap 1333 is formed between the bends 13312 of two adjacent isolation layers 1331. The gap 1333 can refer to the space formed between the parts of the bends 13312 of two adjacent isolation layers 1331 that are not tightly attached to each other.

[0580] By adopting the technical solution of this embodiment, the electrolyte can flow through the gap 1333 between the bends 13312 of two adjacent isolation layers 1331 to the first electrode 131 and the second electrode 132, thereby improving the wetting effect of the electrode assembly 130. In addition, the support member 140 is provided with a receiving groove 1401, and the position of the bends 13312 opposite to the first opening 1402 is suspended. The bends 13312 of two adjacent isolation layers 1331 are in a relatively loose state in the suspended position, so that the gap 1333 between the bends 13312 of two adjacent isolation layers 1331 has a large space in the suspended position. The electrolyte can flow quickly through this space to the first electrode 131 and the second electrode 132, thereby effectively improving the wetting effect of the electrode assembly 130 and improving the cycle performance of the battery cell 100.

[0581] See Figure 8 As shown, in some embodiments, the bends 13312 of two adjacent isolation layers 1331 are partially staggered.

[0582] In the bends 13312 of two adjacent isolation layers 1331, one bend 13312 of isolation layer 1331 covers a portion of the bend 13312 of the other isolation layer 1331, thereby forming a stacked structure.

[0583] By adopting the technical solution of this embodiment, in the bends 13312 of two adjacent isolation layers 1331, the electrolyte can directly enter between the bends 13312 of the two adjacent isolation layers 1331 from the part of the bend 13312 of one isolation layer 1331 that does not cover the bend 13312 of the other isolation layer 1331, reducing the difficulty of the electrolyte flowing to the first electrode 131 or the second electrode 132, improving the wetting effect of the electrode assembly 130, and improving the cycle performance of the battery cell 100.

[0584] See Figure 8 As shown, in some embodiments, the portion of the bent portion 13312 of at least one isolation layer 1331 away from the end of the main body portion 13311 is located in the corresponding receiving groove 1401.

[0585] A portion of the bent portion 13312 of one or more isolation layers 1331, away from the end of the main body 13311, is located within the corresponding receiving groove 1401.

[0586] By adopting the technical solution of this embodiment, the electrolyte can directly enter the space between the bends 13312 of the two adjacent isolation layers 1331 through the end of the bend 13312 away from the main body 13311, so that the electrolyte can flow to the first electrode 131 or the second electrode 132 more quickly, thereby improving the wetting effect of the electrode assembly 130 and improving the cycle performance of the battery cell 100.

[0587] See Figure 4 As shown, in some embodiments, the electrode assembly 130 has a wound structure, and the end of the electrode assembly 130 facing away from the first wall 113 has a tab 1304.

[0588] The electrode tab 1304 is divided into a positive electrode tab 1305 and a negative electrode tab 1306. The positive electrode plate 134 leads out the positive electrode tab 1305, and the negative electrode plate 135 leads out the negative electrode tab 1306. Both the positive electrode tab 1305 and the negative electrode tab 1306 are located at the ends of the electrode assembly 130 facing away from the first wall 113. The positive electrode tab 1305 is used to connect to the positive electrode terminal 161, and the negative electrode tab 1306 is used to connect to the negative electrode terminal 162.

[0589] By adopting the technical solution of this embodiment, the tab 1304 and the support 140 are located on opposite sides of the electrode assembly 130, which can reduce the influence of the tab 1304 on the electrolyte flow to the first electrode 131, and is beneficial to improving the cycle performance and performance of the battery cell 100.

[0590] See Figure 5 As shown, in some embodiments, the electrode assembly 130 has a stacked structure, and at least one of the other sides of the electrode assembly 130, excluding the side near the first wall 113, has tabs 1304 extending out.

[0591] The side of the electrode assembly 130 closest to the first wall 113 is the first side, and the tab 1304 may be located on the side of the electrode assembly 130 adjacent to the first side or on the side of the electrode assembly 130 opposite to the first side.

[0592] In some examples, the positive tab 1305 and the negative tab 1306 may be located on the same side of the electrode assembly 130 or on different sides.

[0593] For example, there are multiple positive electrode plates 134 and negative electrode plates 135, and positive electrode tabs 1305 and negative electrode tabs 1306 are located on the side of the electrode assembly 130 facing away from the support member 140; or, the positive electrode plates 134 and negative electrode plates 135 are respectively disposed on the same side of opposite sides of the electrode assembly 130 along the second direction Y, or the positive electrode plates 134 and negative electrode plates 135 are respectively disposed on opposite sides of the electrode assembly 130 along the second direction Y.

[0594] For example, the separator 133 is continuously arranged, and the positive electrode 134 and the negative electrode 135 are respectively disposed on the same side of the opposite sides of the electrode assembly 130 along the second direction Y, or the positive electrode 134 and the negative electrode 135 are respectively disposed on opposite sides of the electrode assembly 130 along the second direction Y.

[0595] By adopting the technical solution of this embodiment, the tab 1304 and the support 140 are located on opposite sides of the electrode assembly 130, which can reduce the influence of the tab 1304 on the electrolyte flow to the first electrode 131, and is beneficial to improving the cycle performance and performance of the battery cell 100.

[0596] In some embodiments, the battery cell 100 is a lithium iron phosphate battery cell, and the size of the battery cell 100 ranges from 100mm to 400mm along the thickness direction Z of the support member 140.

[0597] Along the thickness direction Z of the support member 140, the dimension of the battery cell 100 is H, where H can refer to the height of the battery cell 100.

[0598] Lithium iron phosphate battery cells usually refer to lithium iron phosphate batteries (LFP batteries), which are lithium-ion batteries that use lithium iron phosphate (LiFePO4) as the positive electrode material.

[0599] H can be 100mm, 400mm, or any number between 100mm and 400mm; for example, H can be, but is not limited to, 100mm, 120mm, 150mm, 180mm, 200mm, 250mm, 300mm, 350mm, or 400mm.

[0600] By adopting the technical solution of this embodiment, the size of the lithium iron phosphate battery cell is set within the above-mentioned range along the thickness direction Z of the support member 140. The larger size of the lithium iron phosphate battery cell along the thickness direction Z of the support member 140 is beneficial to improving the energy density of the lithium iron phosphate battery cell. The electrode assembly 130 inside the lithium iron phosphate battery cell has a larger size along the thickness direction Z of the support member 140, making it difficult for the electrolyte to flow to the end of the electrode assembly 130 facing away from the support member 140, which limits the performance of the lithium iron phosphate battery cell. However, the support member 140 of this application embodiment is provided with a receiving groove 1401, which can provide electrolyte to the electrode assembly 130 of the lithium iron phosphate battery cell, improve the climbing ability of the electrolyte along the thickness direction Z of the support member 140, and improve the cycle performance of the lithium iron phosphate battery cell.

[0601] In some embodiments, the battery cell 100 is a ternary lithium battery cell, and the size of the battery cell 100 ranges from 100mm to 300mm along the thickness direction Z of the support member 140.

[0602] Ternary lithium battery cells refer to lithium-ion batteries that use a composite oxide of three metal elements, namely nickel (Ni), cobalt (Co), manganese (Mn), or aluminum (Al), as the positive electrode material.

[0603] H can be 100mm, 300mm, or any number between 100mm and 300mm; for example, H can be, but is not limited to, 100mm, 120mm, 150mm, 180mm, 200mm, 250mm, or 300mm.

[0604] By adopting the technical solution of this embodiment, the size of the ternary lithium battery cell is set within the above-mentioned range along the thickness direction Z of the support member 140. The larger size of the ternary lithium battery cell along the thickness direction Z of the support member 140 is beneficial to improving the energy density of the ternary lithium battery cell. The electrode assembly 130 in the ternary lithium battery cell has a larger size along the thickness direction Z of the support member 140, making it difficult for the electrolyte to flow to the end of the electrode assembly 130 facing away from the support member 140, which limits the performance of the ternary lithium battery cell. However, the support member 140 of this embodiment is provided with a receiving groove 1401, which can provide electrolyte to the electrode assembly 130 of the ternary lithium battery cell, improve the climbing ability of the electrolyte along the thickness direction Z of the support member 140, and improve the cycle performance of the ternary lithium battery cell.

[0605] In some embodiments, a battery device 1100 includes a plurality of the aforementioned battery cells 100.

[0606] The battery device 1100 of this application embodiment adopts the above-mentioned battery cell 100. The battery cell 100 has good cycle performance, which is beneficial to improving the performance and service life of the battery device 1100.

[0607] In some embodiments, in the battery device, the bottom wall of the housing 110 forms a first wall 113 along the direction of gravity.

[0608] In some examples, "gravity direction" can refer to the direction of gravity when the battery cell 100 is installed on the battery device 1100; in this state, the support 140 is located below the electrode assembly 130, the first wall 113 is located below the support 140, and the first wall 113 is the bottom wall of the housing 110.

[0609] For example, the "gravity direction" can be referred to the thickness direction Z of the support 140.

[0610] In some examples, the housing 200 of the battery device 1100 includes an upper housing and a lower housing connected to each other. The upper housing and the lower housing are connected and enclosed to form a mounting cavity. The battery cell 100 is installed in the mounting cavity. The wall portion of the housing 110 of the battery cell 100 facing the bottom wall of the lower housing 200 is a first wall 113. The upper housing may adopt the structure of the first housing 210 described above, and the lower housing may adopt the structure of the second housing 220.

[0611] In some examples, the housing 200 of the battery device 1100 includes a bottom protective plate, and the wall of the housing 110 of the battery cell 100 facing the bottom protective plate is a first wall 113.

[0612] By adopting the technical solution of this embodiment, in the battery device 1100, the electrolyte will accumulate at the bottom of the housing 110 and in the receiving groove 1401 of the support member 140 under its own gravity. The first opening 1402 of the receiving groove 1401 is set facing the first end face 1301, so that the accumulated electrolyte can wet the bottom of the first electrode 131 and climb upward along the first electrode 131. This helps to break the limitation of the battery cell 100 in the height direction and the limitation of the charging rate, so that the battery cell 100 can have higher energy density and cycle performance.

[0613] In some embodiments, an electrical device includes the battery cell 100 or the battery device 1100 described above, the battery cell 100 or the battery device 1100 being used to store or provide electrical energy.

[0614] The electrical device in this application embodiment uses the aforementioned battery cell 100. The battery cell 100 has good cycle performance, which is beneficial to improving the performance and service life of the electrical device.

[0615] See Figure 4 , Figures 6-8As shown, in some embodiments, the battery cell 100 includes a housing 110, an end cap 120, a support member 140, and two electrode assemblies 130: the housing 110 contains an electrolyte; the end cap 120 covers the opening of the housing 110, and the housing 110 includes a first wall 113; at least a portion of the electrode assembly 130 is housed within the housing 110, and the electrode assembly 130 includes a first electrode 131, the electrode assembly 130 having a first end face 1301 facing the first wall 113, and the end of the first electrode 131 facing the first end face 1301; the support member 140 is located between the first end face 1301 and the first wall 113, and the support member 140 contacts the first end face 1301; wherein, the support member 140 is provided with a receiving groove 1401, and the receiving groove 1401 has a first opening 1402 facing the first end face 1301.

[0616] The electrode assembly 130 includes a flat portion 1302. A portion of the first electrode 131 located in the flat portion 1302 includes a first electrode layer 1311. Multiple first electrode layers 1311 are stacked along a first direction X. At least a portion of the receiving groove 1401 is a first recess 14011, extending along the first direction X and spanning at least two adjacent first electrode layers 1311 along the first direction X.

[0617] See Figure 15 and Figure 16 As shown, the support member 140 includes a connecting portion 142 and a plurality of first branches 141. The plurality of first branches 141 are spaced apart along the second direction Y. The two ends of the connecting portion 142 are respectively connected to the middle of two adjacent first branches 141. Two first grooves 14011 are formed between two adjacent first branches 141. The two first grooves 14011 are respectively located on opposite sides of the connecting portion 142 along the first direction X.

[0618] There are multiple connecting portions 142, including first connecting portions 1421 and second connecting portions 1422. There are multiple first connecting portions 1421 and multiple second connecting portions 1422. All first connecting portions 1421 are equidistant from the first side surface 14051, and all second connecting portions 1422 are equidistant from the first side surface 14051. However, the distance between the first connecting portions 1421 and the first side surface 14051 is not equal to the distance between the second connecting portions 1422 and the first side surface 14051.

[0619] The support member 140 has a central axis M, which is parallel to the second direction Y; all the first connecting parts 1421 are located on one side of the central axis M in the first direction X, and all the second connecting parts 1422 are located on the other side of the central axis M in the first direction X.

[0620] Multiple first connecting parts 1421 are distributed in a straight line along the second direction Y; multiple second connecting parts 1422 are distributed in a straight line along the second direction Y, and the multiple first connecting parts 1421 and multiple second connecting parts 1422 are alternately distributed along the second direction Y.

[0621] The description of the various embodiments above tends to emphasize the differences between the various embodiments. The similarities or similarities between them can be referred to, and for the sake of brevity, they will not be repeated here.

[0622] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized by, include: The casing contains the electrolyte; An end cap is provided at the opening of the housing, the housing including a first wall; At least one electrode assembly, at least a portion of which is housed within the housing, the electrode assembly including a first electrode plate having a first end face facing the first wall, and an end of the first electrode plate being disposed facing the first end face; A support member, at least partially located between the first end face and the first wall and in contact with the first end face, the support member having at least one receiving groove having a first opening facing the first end face.

2. The battery cell according to claim 1, characterized in that: The first end face of at least one of the electrode assemblies covers the first opening of at least one of the receiving grooves.

3. The battery cell according to claim 2, characterized in that: The number of electrode assemblies is two, and the arrangement direction of the two electrode assemblies is perpendicular to the thickness direction of the support; the first end face of the two electrode assemblies covers all the first openings of the receiving grooves.

4. The battery cell according to any one of claims 1 to 3, characterized in that: The electrode assembly includes a flat portion, and the portion of the first electrode located in the flat portion includes a first electrode layer. The number of first electrode layers is multiple, and the multiple first electrode layers are stacked along a first direction. At least a portion of the receiving groove is a first groove that extends along the first direction.

5. The battery cell according to claim 4, characterized in that: At least one of the first grooves spans at least two adjacent first electrode layers along the first direction.

6. The battery cell according to claim 4, characterized in that: The support member includes a plurality of first branches arranged along a second direction, and at least one first groove is formed between two adjacent first branches; the second direction is perpendicular to the first direction and the thickness direction of the support member.

7. The battery cell according to claim 6, characterized in that: The support also includes a connecting portion, and a plurality of first branches are spaced apart along the second direction, with adjacent two first branches connected by the connecting portion.

8. The battery cell according to claim 7, characterized in that: The two ends of the connecting part are respectively connected to the middle of two adjacent first branches; two first grooves are formed between two adjacent first branches, and the two first grooves are respectively located on opposite sides of the connecting part along the first direction.

9. The battery cell of claim 8, wherein: The support member has a first side and a second side that are distributed opposite to each other along the first direction, 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; and / or, the dimensions of the two first grooves located on opposite sides of the same connecting portion along the first direction are not equal along the first direction.

10. The battery cell according to claim 8, characterized in that: The number of connecting parts is multiple, and the multiple connecting parts include at least one first connecting part and at least one second connecting part; the support member has a first side surface, which is located on one side of the support member in the first direction; The distances between all the first connecting parts and the first side are not equal to the distances between all the second connecting parts and the first side.

11. The battery cell of claim 10, wherein: The support member has a central axis parallel to the second direction; at least one first connecting portion is located on one side of the central axis in the first direction, and at least one second connecting portion is located on the other side of the central axis in the first direction.

12. The battery cell of claim 10, wherein: The number of first connecting parts is multiple, and the multiple first connecting parts are distributed in a straight line along the second direction; and / or, the number of second connecting parts is multiple, and the multiple second connecting parts are distributed in a straight line along the second direction.

13. The battery cell according to claim 10, characterized in that: The number of first connecting parts is multiple, the number of second connecting parts is multiple, and the multiple first connecting parts and the multiple second connecting parts are alternately distributed along the second direction.

14. The battery cell according to claim 8, characterized in that: The number of connecting parts is multiple, and the multiple connecting parts are distributed in a straight line along the second direction.

15. The battery cell according to claim 14, characterized in that: The support member has a first side and a second side that are distributed opposite to each other along the first direction, and at least one of the connecting portions is at the same distance from the first side and from the second side; and / or, the two first grooves located on opposite sides of the same connecting portion along the first direction are of equal size along the first direction.

16. The battery cell according to claim 15, characterized in that: At least two of the first grooves, located on the same side of the connection and arranged along the second direction, have different dimensions along the first direction.

17. The battery cell according to claim 16, characterized in that: At least three of the first grooves located on the same side of the connecting portion and arranged along the second direction have a gradually increasing size along the first direction; and / or, at least three other first grooves located on the same side of the connecting portion and arranged along the second direction have a gradually decreasing size along the first direction.

18. The battery cell according to claim 14, characterized in that: The dimensions of at least three consecutively arranged first grooves, located on the same side of the connecting portion and arranged along the second direction, decrease first and then increase along the first direction.

19. The battery cell according to claim 7, characterized in that: Two adjacent first branches are connected to the same side of the connecting portion along the first direction and form a first groove.

20. The battery cell according to claim 19, characterized in that: The number of the first grooves is multiple, and the multiple first grooves are arranged along the second direction, with at least two first grooves having the same size along the first direction.

21. The battery cell according to claim 19, characterized in that: The support member further includes a plurality of second branches arranged at intervals along the second direction, with two adjacent second branches connected to the side of the connecting portion away from the first branch, and a first groove formed between two adjacent second branches.

22. The battery cell according to claim 21, characterized in that: Along the first direction, the projection of at least one of the first branches does not completely overlap with the projections of all the second branches.

23. The battery cell according to claim 22, characterized in that: Along the second direction, a plurality of first branches and a plurality of second branches are alternately distributed.

24. The battery cell according to claim 7, characterized in that: Along the first direction, the dimension of at least one of the first grooves along the second direction first decreases and then increases.

25. The battery cell according to claim 19, characterized in that: The two adjacent first branches are arranged at an angle.

26. The battery cell according to claim 25, characterized in that: The support member further includes a plurality of second branches arranged at intervals along the second direction, with two adjacent second branches connected to the side of the connecting portion facing away from the first branch, and two adjacent second branches arranged at an included angle to form a first groove.

27. The battery cell according to claim 6, characterized in that: Multiple first branches are connected sequentially along the second direction, and two adjacent first branches are arranged at an angle to form a first groove.

28. The battery cell according to any one of claims 1 to 3, characterized in that: The electrode assembly includes a flat portion, and the portion of the first electrode located in the flat portion includes a first electrode layer. There are multiple first electrode layers, and the multiple first electrode layers are stacked along a first direction. The second direction is perpendicular to the first direction and the thickness direction of the support member. At least a portion of the receiving groove is a first groove that extends along the second direction.

29. The battery cell according to claim 28, characterized in that: The support member includes a connecting portion and a plurality of first branches spaced apart along the first direction. The two ends of the connecting portion are respectively connected to the middle of two adjacent first branches. Two first grooves are formed between two adjacent first branches, and the two first grooves are respectively located on opposite sides of the connecting portion along the second direction.

30. The battery cell according to claim 29, characterized in that: The support member has a third side and a fourth side that are distributed opposite to each other along the second direction, and at least one of the connecting portions is equidistant from the third side and from the fourth side; and / or, the two first grooves located on opposite sides of the same connecting portion along the second direction are equidistant from each other along the second direction.

31. The battery cell according to claim 29, characterized in that: The number of connecting parts is multiple, and the multiple connecting parts are distributed in a straight line along the first direction.

32. The battery cell according to claim 4, characterized in that: Along the extension direction perpendicular to the first groove and the thickness direction of the support member, the size of the first groove ranges from 0.5 mm to 30 mm.

33. The battery cell of claim 4, wherein: Along the thickness direction of the support member, the size of the first groove ranges from 0.1 mm to 3 mm.

34. The battery cell of any one of claims 1-3, wherein: The support member has a first surface and a second surface arranged opposite to each other along its own thickness direction, and a side surface connecting the first surface and the second surface. The first surface faces the first end face, the second surface faces away from the first end face, the first opening is located on the first surface, and at least one of the receiving grooves penetrates the side surface and forms a second opening.

35. The battery cell according to claim 34, characterized in that: At least one side of the first end face protrudes from the side face and forms a receiving space, and the second opening communicates with the receiving space.

36. The battery cell of claim 34, wherein: At least one of the receiving grooves extends through the side surface along a first direction, which is the width direction of the support member.

37. The battery cell according to claim 36, characterized in that: The width of the support member is W, and along the first direction, the dimensions of all the electrode assemblies are T1, where 0.9 ≤ W / T1 < 1.

38. The battery cell of claim 34, wherein: At least one of the receiving grooves extends through the side surface along a second direction, which is the length direction of the support member.

39. The battery cell of claim 38, wherein: Along the second direction, the electrode assembly has a dimension of L1, and the support has a length of L2, wherein 0.95 ≤ L2 / L1 < 1.

40. The battery cell according to claim 19, characterized in that: Along the first direction, the ends of two adjacent first branches located on the same side are connected to the connecting portion, and the ends of two adjacent first branches located on the other side are connected to the connecting portion.

41. The battery cell according to any one of claims 1 to 3, characterized in that: The support member has a first surface and a second surface that are arranged opposite to each other along its own thickness direction. The first surface faces the first end face, and the second surface faces away from the first end face. The first opening is located on the first surface, and at least one of the receiving grooves penetrates the second surface to form a third opening.

42. The battery cell according to claim 41, characterized in that: The battery cell includes a first insulating member, at least a portion of which is located within the housing. The first insulating member has a receiving space. At least a portion of the electrode assembly and the support member are located within the receiving space. The first insulating member has a first through hole communicating with the receiving space and the outside of the first insulating member.

43. The battery cell according to claim 42, characterized in that: The first insulating member has a second wall, at least a portion of which is located between the support member and the first wall. The second wall has a first through hole that penetrates the second wall along the thickness direction of the support member. Along the thickness direction of the support member, the projection of the first through hole does not coincide with the projection of all the third openings.

44. The battery cell according to claim 6, characterized in that: The support also includes a base plate, a plurality of first branches are arranged at intervals along the second direction, the base plate is located between the first end face and the first wall, and the plurality of first branches are connected to the surface of the base plate facing the first end face.

45. The battery cell according to claim 6, characterized in that: At least a portion of the surface of at least one of the first branches facing the first end face is an arc surface.

46. ​​The battery cell according to claim 7, characterized in that: At least a portion of the surface of at least one of the connecting portions facing the first end face is an arc surface.

47. The battery cell of claim 7, wherein: A second through hole is provided at at least one end of the support member along the second direction, the second through hole penetrating the support member along the thickness direction, the first branch is provided with the second through hole; and / or, the connecting portion is provided with the second through hole.

48. The battery cell according to any one of claims 1 to 3, characterized in that: The support member further includes a substrate and a plurality of spaced protrusions; the substrate is located between the first end face and the first wall, the plurality of protrusions are connected to the surface of the substrate facing the first end face, and the plurality of protrusions and the substrate form at least one receiving groove.

49. The battery cell of claim 48, wherein: The number of the receiving grooves is multiple, and the multiple protrusions are arranged in a matrix to form multiple receiving grooves arranged in a crisscross pattern.

50. The battery cell according to claim 48, characterized in that: At least a portion of the surface of at least one of the protrusions facing the first end face is an arc surface.

51. The battery cell according to claim 44, characterized in that: Along the thickness direction of the support member, the size of the substrate ranges from 0.1 mm to 1 mm.

52. The battery cell according to any one of claims 1 to 3, characterized in that: The thickness of the support member ranges from 0.1 mm to 3 mm.

53. The battery cell according to any one of claims 1 to 3, characterized in that: The support member has a first surface, which is disposed facing the first end face, and the first opening is located on the first surface; the area of ​​the first surface is S1, and the area of ​​the first opening of all the receiving grooves is S2, 0.1≤S2 / (S1+S2)≤0.

8. Optionally, 0.4≤S2 / (S1+S2)≤0.

7.

54. The battery cell of any one of claims 1-3, wherein: The support component is an insulating part.

55. The battery cell according to any one of claims 1 to 3, characterized in that: The battery cell includes a first insulating member, at least a portion of which is located within the housing. The first insulating member has a receiving space. At least a portion of the electrode assembly and the support member are both located within the receiving space. The first insulating member has a second wall, at least a portion of which is located between the support member and the first wall. The support member and the second wall are integrally formed.

56. The battery cell of claim 55, wherein: The battery cell has a third through hole, which penetrates the support and the second wall along the thickness direction of the support.

57. The battery cell of any one of claims 1-3, wherein: The battery cell includes a first insulating member, at least a portion of which is located within the housing. The first insulating member has a receiving space, and at least a portion of the electrode assembly and the support member are both located within the receiving space.

58. The battery cell of claim 57, wherein: The battery cell includes a second insulating member, at least a portion of which is located on the side of the end cap facing the electrode assembly, and the first insulating member is connected to the second insulating member.

59. The battery cell according to any one of claims 1 to 3, characterized in that: The battery cell includes an electrode terminal and a second insulating member. The electrode terminal is disposed on the end cap and is electrically connected to the electrode assembly. At least a portion of the second insulating member is located on the side of the end cap facing the electrode assembly, and the second insulating member insulatingly separates the electrode terminal and the end cap.

60. The battery cell according to any one of claims 1 to 3, characterized in that: The housing is an insulating housing.

61. The battery cell according to any one of claims 1 to 3, characterized in that: The inner wall of the housing is covered with an insulating coating.

62. The battery cell according to any one of claims 1 to 3, characterized in that: The housing includes an integrally formed outer peripheral wall and an end wall. The outer peripheral wall is connected to the periphery of the end wall, and the end cap is sealed to the opening of the outer peripheral wall facing away from the end wall. The end wall forms the first wall.

63. The battery cell according to any one of claims 1 to 3, characterized in that: Along the direction of gravity, the bottom wall of the shell forms the first wall.

64. The battery cell according to any one of claims 1 to 3, characterized in that: The electrode assembly includes a second electrode and an isolator, wherein the first electrode and the second electrode have different polarities; The isolator is located between the first electrode and the second electrode, and extends beyond the first electrode and the second electrode toward the end of the support. The isolator is bent toward the end of the support to form a stacked structure and the first end face.

65. The battery cell of claim 64, wherein: The electrode assembly includes a flat portion, the portion of the first electrode located in the flat portion includes a first electrode layer, the portion of the second electrode located in the flat portion includes a second electrode layer, and the portion of the insulating member located in the flat portion includes an insulating layer; the number of the first electrode layer, the number of the second electrode layer, and the number of the insulating layer are all multiple. Each of the insulating layers includes a main body and a bent portion. At least a portion of the main body is located between adjacent first electrode layers and second electrode layers. The end of the main body facing the support is connected to the bent portion. The bent portion is entirely located outside the corresponding adjacent first electrode layers and first electrode layers. The bent portion is bent relative to the main body. The bent portions of two adjacent isolation layers are stacked, and a gap is formed between the bent portions of two adjacent isolation layers.

66. The battery cell according to claim 65, characterized in that: The bends of two adjacent isolation layers are partially staggered.

67. The battery cell according to claim 65, characterized in that: At least one portion of the bent portion of the isolation layer, away from the end of the main body, is located within the corresponding receiving groove.

68. The battery cell of any one of claims 1-3, wherein: The electrode assembly has a wound structure, and the end of the electrode assembly facing away from the first wall has an electrode tab. Alternatively, the electrode assembly may be a stacked structure, with at least one side of the electrode assembly, excluding the side closest to the first wall, having tabs extending from it.

69. The battery cell according to any one of claims 1 to 3, characterized in that: The battery cell is a lithium iron phosphate battery cell, and the size of the battery cell ranges from 100mm to 400mm along the thickness direction of the support member. Alternatively, the battery cell is a ternary lithium battery cell, and the size of the battery cell ranges from 100mm to 300mm along the thickness direction of the support member.

70. A battery device, comprising: It includes multiple battery cells according to any one of claims 1 to 69.

71. The battery device according to claim 70, characterized in that: In the battery device, the bottom wall of the casing forms the first wall along the direction of gravity.

72. An electrical device, characterized in that: Includes a battery cell according to any one of claims 1 to 69 or a battery device according to claim 70 or 71, wherein the battery cell or the battery device is used to store or provide electrical energy.

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