Battery monomer, battery device and electric device

Abstract

The invention discloses a battery monomer, a battery device and a power utilization device, and belongs to the technical field of batteries. The battery monomer comprises a shell, an electrode assembly, a first insulating part and a second insulating part, the shell is provided with a first wall in a first direction; the electrode assembly is contained in the shell, the electrode assembly is provided with a first surface in a second direction, and the second direction is perpendicular to the first direction; the first insulating part is arranged between the first wall and the electrode assembly; the second insulating part at least partially wraps the electrode assembly, the second insulating part comprises a first main body part and a first connecting part, the first main body part at least partially covers the first surface, in the first direction, the first connecting part is connected to one end, close to the first wall, of the first main body part, and the first connecting part is connected with the first insulating part; wherein the thickness of the first connecting part is greater than that of the first main body part. According to the technical scheme provided by the invention, the reliability of the battery monomer can be improved.

Description

Technical Field

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

[0002] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, power batteries, as the power source, play an irreplaceable and crucial role. With the vigorous promotion of new energy vehicles, the demand for power battery products is also increasing. Among them, batteries, as core components of new energy vehicles, have high requirements in terms of reliability and service life.

[0003] In battery technology, to improve the reliability of individual battery cells, an insulating structure, such as an insulating film and a lower plastic layer, is typically placed between the outer periphery of the electrode assembly and the inner periphery of the casing. However, when the electrode assembly is placed inside the casing, the inertia during its movement and the uneven stress on the insulating film can lead to breakage at the connection between the insulating film and the lower plastic layer, thus hindering the improvement of the battery cell's reliability. Summary of the Invention

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

[0005] In a first aspect, embodiments of this application provide a battery cell, including a casing, an electrode assembly, a first insulating member, and a second insulating member; the casing has a first wall in a first direction; the electrode assembly is housed within the casing, and the electrode assembly has a first surface in a second direction, the second direction being perpendicular to the first direction; the first insulating member is disposed between the first wall and the electrode assembly; the second insulating member at least partially encloses the electrode assembly, the second insulating member including a first main body portion and a first connecting portion, the first main body portion at least partially covering the first surface, and in the first direction, the first connecting portion is connected to one end of the first main body portion near the first wall, and the first connecting portion is connected to the first insulating member; wherein, the thickness of the first connecting portion is greater than the thickness of the first main body portion.

[0006] In the above technical solution, the thickness of the first connecting part is greater than the thickness of the first main body. On the one hand, this makes the strength of the first connecting part higher than that of the first main body, thereby reducing the risk of breakage at the connection between the first connecting part and the first insulating component due to the inertia of the electrode assembly and uneven stress on the first connecting part when the electrode assembly enters the housing. On the other hand, the thickness of the first main body is less than that of the first connecting part, reducing the space occupied by the first main body in the housing. Thus, with a fixed space in the housing, the electrode assembly can occupy more space, thereby increasing the volume of the electrode assembly and increasing the energy density of the battery cell.

[0007] In some embodiments, the maximum width of the first connecting portion in the first direction is B, which satisfies 0 < B ≤ 10 mm.

[0008] In the above technical solution, when B > 0, the first connecting part can have a certain size in the first direction to connect with the first insulating member; when B ≤ 10mm, the size of the first connecting part in the first direction can be reduced. On the one hand, this reduces the risk of lithium plating in the electrode assembly caused by the first connecting part being inserted into the surface of the electrode assembly facing the first wall in the first direction, thereby improving the reliability of the battery cell; on the other hand, it reduces the risk of lithium plating in the electrode assembly caused by the first connecting part squeezing the edge of the surface of the electrode assembly facing the first wall in the second direction, thereby improving the reliability of the battery cell. Therefore, when 0 < B ≤ 10mm, the first connecting part can have a certain size in the first direction to connect with the first insulating member, while reducing the risk of lithium plating in the electrode assembly, thereby improving the reliability of the battery cell.

[0009] In some embodiments, 3.5mm ≤ B ≤ 7mm.

[0010] In the above technical solution, when B≥3.5mm, the first connecting part has sufficient size in the first direction to connect with the first insulating part, thereby further increasing the reliability of the connection between the first connecting part and the first insulating part; therefore, when 3.5mm<B≤10mm, the first connecting part can improve the reliability of the connection between the first connecting part and the first insulating part, while reducing the risk of lithium plating in the electrode assembly, so as to improve the reliability of the battery cell.

[0011] In some embodiments, the thickness of the first connecting portion in the second direction is A, which satisfies 0.2mm≤A≤0.5mm.

[0012] In the above technical solution, when A ≥ 0.2 mm, the cross-section of the first connecting part, when it has a certain length, is cut by a plane perpendicular to the first direction, resulting in a certain area. This strengthens the first connecting part and reduces the risk of breakage at the connection between the first connecting part and the first insulating component due to the inertia of the electrode assembly and uneven stress on the first connecting part when the electrode assembly enters the casing, thereby improving the reliability of the battery cell. When A ≤ 0.5 mm, it reduces the risk of the first connecting part not being properly melted by the heating device when the first connecting part and the first insulating component are joined by heat fusion. This reduces the risk of decreased connection strength, thereby improving the reliability of the thermal fusion connection between the first connecting part and the first insulating part. Therefore, when 0.2mm≤A≤0.5mm, the first connecting part can reduce the risk of breakage at the connection between the first connecting part and the first insulating part due to the inertia of the electrode assembly and uneven stress on the first connecting part when the electrode assembly enters the housing, thereby improving the reliability of the battery cell. At the same time, it can reduce the risk of decreased connection strength caused by the first connecting part not being properly melted by the heating device when the first connecting part and the first insulating part are thermally fused together, thereby improving the reliability of the thermal fusion connection between the first connecting part and the first insulating part.

[0013] In some embodiments, 0.2mm ≤ A ≤ 0.45mm.

[0014] In the above technical solution, when A≤0.45mm, the risk of reduced connection strength due to the first connecting part not being properly melted by the heating device when the first connecting part and the first insulating part are connected by heat fusion can be further reduced, thereby further improving the reliability of the heat fusion connection between the first connecting part and the first insulating part; therefore, when 0.2mm≤A≤0.45mm, the first connecting part can reduce the risk of breakage at the connection between the first connecting part and the first insulating part due to the inertia of the electrode assembly and uneven stress on the first connecting part when the electrode assembly enters the shell, thereby improving the reliability of the battery cell. At the same time, it can further reduce the risk of reduced connection strength due to the first connecting part not being properly melted by the heating device when the first connecting part and the first insulating part are connected by heat fusion, thereby further improving the reliability of the heat fusion connection between the first connecting part and the first insulating part.

[0015] In some embodiments, the length of the first connecting portion in the third direction is L, satisfying 0 < L ≤ 350 mm, and the first direction, the second direction, and the third direction are perpendicular to each other.

[0016] In the above technical solution, when L≤350mm, the first connecting part will not extend beyond the first surface of the electrode assembly in the third direction, so that the first connecting part will not extend to the side of the electrode assembly adjacent to the first surface. This makes the first connecting part overlap with the rest of the second insulating part, resulting in an excessively thick overlapping part. This reduces the risk that the overlapping part cannot be well melted by the heating device due to the excessive thickness of the overlapping part, thus reducing the connection strength. This improves the reliability of the thermal fusion connection between the second insulating part and the first insulating part.

[0017] In some embodiments, 170mm ≤ L ≤ 350mm.

[0018] In the above technical solution, when L≥170mm, the first connecting part has a certain size in the third direction, which facilitates the thermal fusion connection between the first connecting part and the structure on the first insulating part used for thermal fusion. Therefore, when 170mm≤L≤350mm, the first connecting part can be easily thermally fused with the structure on the first insulating part used for thermal fusion, while ensuring that the first connecting part does not extend to the side of the electrode assembly adjacent to the first surface, so that the first connecting part overlaps with the rest of the second insulating part, resulting in an excessively thick overlapping part. This reduces the risk that the overlapping part cannot be well melted by the heating device due to the excessive thickness of the overlapping part, thus reducing the risk of reduced connection strength, thereby improving the reliability of the thermal fusion connection between the second insulating part and the first insulating part.

[0019] In some embodiments, the first connection portion includes a plurality of first extension regions, which are spaced apart along a third direction, wherein the first direction, the second direction, and the third direction are perpendicular to each other.

[0020] In the above technical solution, the first connecting part includes a plurality of first extension areas, which are spaced apart along a third direction to facilitate heat fusion with the corresponding heat fusion structure on the first insulating member.

[0021] In some embodiments, the first insulating member includes a substrate and a plurality of protrusions, wherein the plurality of protrusions protrude from the side of the substrate facing the electrode assembly along the first direction and are spaced apart along the third direction; a plurality of first extension regions are connected to the plurality of protrusions in a one-to-one correspondence.

[0022] In the above technical solution, the first insulating member includes a substrate and a plurality of protrusions. On the one hand, along the first direction, the plurality of protrusions protrude from the side of the substrate facing the electrode assembly and are spaced apart along the third direction, so that the protrusions can insulate and isolate the electrode assembly's opposite polarity tabs or other battery cell structural components connected to the opposite polarity tabs. On the other hand, the plurality of first extension areas are connected one-to-one with the plurality of protrusions to maximize the connection area between the first insulating member and the first connecting part, thereby increasing the reliability of the connection between the first insulating member and the first connecting part.

[0023] In some embodiments, the first connecting portion further includes a first body region, which is connected to one end of the first main body portion near the first wall in the first direction, and the first body region extends along the third direction; a plurality of first extension regions are connected to the first body region and protrude from the first body region in the first direction.

[0024] In the above technical solution, multiple first extension areas are connected through the first body area, and multiple first extension areas and the first main body are connected through the first body area, thereby increasing the integrity of the first connecting part and facilitating the processing and manufacturing of the first connecting part.

[0025] In some embodiments, the first connecting portion includes a first sub-connecting portion and a second sub-connecting portion, which are stacked along the second direction; the first sub-connecting portion and the second sub-connecting portion are thermally fused together to form a first thermally fused region and a second thermally fused region, which are spaced apart along the third direction; at least a portion of the first thermally fused region is located in the first extension region, and the second thermally fused region is located in the first body region; the size of the first thermally fused region in the first direction is larger than the size of the second thermally fused region in the first direction.

[0026] In the above technical solution, the size of the first hot melt zone in the first direction is larger than that of the second hot melt zone in the first direction. Thus, when the sizes of the first and second hot melt zones in the third direction are constant, the area of ​​the first hot melt zone is larger than that of the second hot melt zone. This results in the first sub-connector and the second sub-connector having a larger connection area in the first extension area, thereby increasing the connection strength of the first and second sub-connectors in the first extension area and reducing the risk of the first and second sub-connectors separating in the first extension area. This further improves the strength of the connection area between the first connector and the first insulating member, thereby reducing the risk of the connection between the first connector and the first insulating member breaking due to the inertia of the electrode assembly and uneven stress on the first connector when the electrode assembly enters the housing.

[0027] In some embodiments, a portion of the first hot melt zone is located in the first extension zone, and another portion of the first hot melt zone is located in the first body zone.

[0028] In the above technical solution, a portion of the first hot melt zone is located in the first extension zone, and another portion of the first hot melt zone is located in the first body zone, thereby increasing the strength of the area adjacent to the connection area between the first connection and the first insulating member in the first direction, thereby reducing the risk of this part breaking when the electrode assembly enters the housing due to the inertia of the electrode assembly and the uneven force on the first connection.

[0029] In some embodiments, the first extension region protrudes from the first body region by a dimension B1 in the first direction, satisfying 0 < B1 ≤ 10 mm.

[0030] In the above technical solution, when B1 > 0, the first extension region can have a certain size in the first direction to connect with the first insulating member; when B1 ≤ 10mm, the size of the first extension region in the first direction can be reduced. On the one hand, this reduces the risk of lithium plating in the electrode assembly caused by the first extension region being inserted into the surface of the electrode assembly facing the first wall in the first direction, thereby improving the reliability of the battery cell; on the other hand, it reduces the risk of lithium plating in the electrode assembly caused by the first extension region squeezing the edge of the surface of the electrode assembly facing the first wall in the second direction, thereby improving the reliability of the battery cell. Therefore, when 0 < B1 ≤ 10mm, the first extension region can have a certain size in the first direction to connect with the first insulating member, while reducing the risk of lithium plating in the electrode assembly, thereby improving the reliability of the battery cell.

[0031] In some embodiments, 3.5mm ≤ B1 ≤ 7mm.

[0032] In the above technical solution, when B1≥3.5mm, the first extension area has sufficient size in the first direction to connect with the first insulating element, thereby further increasing the reliability of the connection between the first extension area and the first insulating element; therefore, when 3.5mm<B1≤10mm, the first extension area can improve the reliability of the connection between the first extension area and the first insulating element, while reducing the risk of lithium plating in the electrode assembly, so as to improve the reliability of the battery cell.

[0033] In some embodiments, the dimension of the first extension region in the third direction is L1, satisfying 12mm≤L1≤25mm.

[0034] In the above technical solution, when L1 ≥ 12mm, the first extension area can effectively cover the protrusion of the first insulating member and the heating mechanism of the heating device in the first direction, facilitating the thermal fusion connection between the first extension area and the protrusion of the first insulating member. When L1 ≤ 25mm, the area of ​​the first extension area can be reduced, thereby reducing the volume of the first connecting part and the material usage of the first connecting part, thus reducing the manufacturing cost of the first connecting part. Therefore, when 12mm ≤ L1 ≤ 25mm, the first extension area can effectively cover the protrusion of the first insulating member and the heating mechanism of the heating device in the first direction, facilitating the thermal fusion connection between the first extension area and the protrusion of the first insulating member, while reducing the volume of the first connecting part, thereby reducing the material usage of the first connecting part and the manufacturing cost of the first connecting part.

[0035] In some embodiments, 12mm≤L1≤20mm.

[0036] In the above technical solution, when L1≤20mm, the area of ​​the first extension region can be further reduced, thereby reducing the volume of the first connecting part, and thus reducing the material usage of the first connecting part, thereby further reducing the manufacturing cost of the first connecting part. Therefore, when 12mm≤L1≤25mm, the first extension region can better cover the protrusion of the first insulating member and the heating mechanism of the heating device in the first direction, so as to facilitate the thermal fusion connection between the first extension region and the protrusion of the first insulating member, while further reducing the volume of the first connecting part, thereby reducing the material usage of the first connecting part, and thus further reducing the manufacturing cost of the first connecting part.

[0037] In some embodiments, the first connecting portion includes a first sub-connecting portion and a second sub-connecting portion, the first sub-connecting portion and the second sub-connecting portion are stacked along the second direction, and the first sub-connecting portion is integrally formed with the first main body portion.

[0038] In the above technical solution, the first sub-connecting part is integrally formed with the first main body. On the one hand, it reduces the processing of the first sub-connecting part and the process of connecting the first main body and the first sub-connecting part, which facilitates the processing of the first main body and part of the first connecting part. On the other hand, it reduces the risk of weak parts at the connection between the first main body and the first sub-connecting part, and improves the connection reliability between the first connecting parts.

[0039] In some embodiments, the thickness of the first sub-connecting portion is equal to the thickness of the first main body portion.

[0040] In the above technical solution, the thickness of the first sub-connector is equal to the thickness of the first main body, which reduces the complexity of the equipment used to manufacture the first sub-connector and the first main body, improves the production qualification rate of the first sub-connector and the first main body, and facilitates the processing of the first sub-connector and the first main body.

[0041] In some embodiments, the second sub-connection portion is located between the first sub-connection portion and the first insulating member.

[0042] In the above technical solution, the second sub-connecting part is located between the first sub-connecting part and the first insulating part. When the first connecting part and the first insulating part are heat-fused together, the second sub-connecting part is limited in the second direction by the first sub-connecting part and the first insulating part, thereby reducing the risk of poor forming of the heat-fused area caused by the folding of the second sub-connecting part and improving the stability of the connection between the first connecting part and the first insulating part.

[0043] In some embodiments, the first sub-connecting portion and the second sub-connecting portion are integrally formed, and along the first direction, the end of the first sub-connecting portion away from the first connecting portion is connected to the second sub-connecting portion.

[0044] In the above technical solution, the first sub-connecting part and the second sub-connecting part are integrally formed, thereby reducing the processing of the second sub-connecting part and the process of connecting the first sub-connecting part and the second sub-connecting part, and facilitating the processing of the first main body and the first connecting part.

[0045] In some embodiments, a first groove is provided at the crease between the first sub-connecting portion and the second sub-connecting portion.

[0046] In the above technical solution, a first groove is provided at the crease between the first sub-connecting part and the second sub-connecting part. On the one hand, it facilitates the second sub-connecting part to be folded along the first groove so as to be stacked with the first sub-connecting part in the second direction. On the other hand, the first groove can be used to release the internal stress generated between the first sub-connecting part and the second sub-connecting part due to the folding of the second sub-connecting part relative to the first sub-connecting part, thereby reducing the risk of bulging at the connection between the first sub-connecting part and the second sub-connecting part and improving the production qualification rate of the first connecting part.

[0047] In some embodiments, the thickness of the first sub-connecting portion, the thickness of the second sub-connecting portion, and the thickness of the first main body portion are all equal.

[0048] In the above technical solution, the thickness of the first sub-connector, the thickness of the second sub-connector, and the thickness of the first main body are equal, which reduces the complexity of the instruments used to manufacture the first sub-connector, the second sub-connector, and the first main body, improves the production qualification rate of the first sub-connector, the second sub-connector, and the first main body, and facilitates the processing of the first sub-connector, the second sub-connector, and the first main body.

[0049] In some embodiments, the first sub-connection portion and the second sub-connection portion are integrally disposed.

[0050] In the above technical solution, the first sub-connecting part and the second sub-connecting part are separately arranged and stacked along the second direction, which makes the structure simple and easy to implement.

[0051] In some embodiments, the second sub-connector and the first sub-connector are thermally fused together along the second direction.

[0052] In the above technical solution, the use of hot-melt connection between the second sub-connecting part and the first sub-connecting part can improve the connection strength and reliability between the second sub-connecting part and the first sub-connecting part. At the same time, it eliminates the need for a component to connect the second sub-connecting part and the first sub-connecting part, which is beneficial for optimizing the production process and production cycle, and can reduce the manufacturing cost of the first connecting part.

[0053] In some embodiments, the second sub-connection portion and the first sub-connection portion are welded along the second direction.

[0054] In the above technical solution, the welding method is used to connect the second sub-connecting part and the first sub-connecting part, which can effectively improve the connection firmness and reliability between the second sub-connecting part and the first sub-connecting part, and help reduce the risk of the second sub-connecting part and the first sub-connecting part falling off each other during use, thereby improving the strength of the first connecting part.

[0055] In some embodiments, the second sub-connector is adhered to the first sub-connector along the second direction.

[0056] In the above technical solution, the second sub-connecting part and the first sub-connecting part are connected by adhesive bonding, which can improve the binding force between the second sub-connecting part and the first sub-connecting part, reduce the risk of wrinkling of the first connecting part, thereby improving the strength of the first connecting part. This is beneficial for optimizing the production process and production cycle, and can also reduce the manufacturing cost of the first connecting part.

[0057] In some embodiments, the electrode assembly has a second surface disposed opposite to the first surface along the second direction; the second insulating member further includes a second body portion and a second connecting portion, the second body portion at least partially covering the second surface, the second connecting portion being connected to one end of the second body portion near the first wall, and the second connecting portion being connected to the first insulating member; wherein the thickness of the second connecting portion is greater than the thickness of the second body portion.

[0058] In the above technical solution, the thickness of the second connecting part is greater than the thickness of the second main body. On the one hand, this makes the strength of the second connecting part higher than that of the second main body, thereby reducing the risk of breakage at the connection between the second connecting part and the first insulating member due to the inertia of the electrode assembly and the uneven stress on the second connecting part when the electrode assembly enters the housing. On the other hand, the thickness of the second main body is less than that of the second connecting part, reducing the space occupied by the second main body in the housing. Thus, with a fixed space in the housing, the electrode assembly can occupy more space, thereby increasing the volume of the electrode assembly and increasing the energy density of the battery cell.

[0059] In some embodiments, the thickness of the second body portion is equal to the thickness of the first body portion.

[0060] In the above technical solution, the thickness of the second main body is equal to the thickness of the first main body, so that the thickness of the raw materials of the first main body and the second main body is the same, thereby enabling the first main body and the second main body to be produced simultaneously using raw materials of the same thickness, thus making it easier to manufacture the raw materials of the first main body and the second main body together, which facilitates the production of the second insulating component.

[0061] In some embodiments, the electrode assembly has a third surface and a fourth surface disposed opposite each other along a third direction, the first direction, the second direction, and the third direction being perpendicular to each other; the second insulating member further includes a third body portion and a fourth body portion, the third body portion and the fourth body portion being respectively connected to the two ends of the first body portion along the third direction; the third body portion at least partially covers the third surface, and in the first direction, the end of the third body portion near the first wall is connected to the first insulating member; the fourth body portion at least partially covers the fourth surface, and in the first direction, the end of the fourth body portion near the first wall is connected to the first insulating member.

[0062] In the above technical solution, the third surface is at least partially covered by the third main body and the fourth surface is at least partially covered by the fourth main body to insulate and isolate the third surface, the fourth surface and the outer casing, thereby reducing the risk of short circuit between the electrode assembly and the outer casing and improving the reliability of the battery cell. At the same time, the end of the third main body near the first wall is connected to the first insulating member, and the end of the fourth main body near the first wall is connected to the first insulating member, thereby increasing the area of ​​connection between the second insulating member and the first insulating member, thereby improving the reliability of the connection between the second insulating member and the first insulating member.

[0063] In some embodiments, the thickness of the third main body portion and the thickness of the fourth main body portion are both equal to the thickness of the first main body portion.

[0064] In the above technical solution, the thickness of the third main body and the thickness of the fourth main body are equal to the thickness of the first main body, which reduces the complexity of the equipment used to manufacture the third main body, the fourth main body and the first main body, improves the production qualification rate of the third main body, the fourth main body and the first main body, and facilitates the processing of the third main body, the fourth main body and the first main body.

[0065] In some embodiments, the second insulating member further includes a fifth body portion and a sixth body portion, the fifth body portion and the sixth body portion being respectively connected to both ends of the second body portion along the third direction; the fifth body portion at least partially covers the third surface, and one end of the fifth body portion near the first wall is connected to the first insulating member; the sixth body portion at least partially covers the fourth surface, and one end of the sixth body portion near the first wall is connected to the first insulating member.

[0066] In the above technical solution, the third surface is at least partially covered by the fifth main body and the fourth surface is at least partially covered by the sixth main body to insulate and isolate the third surface, the fourth surface and the outer casing, thereby reducing the risk of short circuit between the electrode assembly and the outer casing and improving the reliability of the battery cell. At the same time, the end of the fifth main body near the first wall is connected to the first insulating member, and the end of the sixth main body near the first wall is connected to the first insulating member, thereby increasing the area of ​​connection between the second insulating member and the first insulating member, thereby improving the reliability of the connection between the second insulating member and the first insulating member.

[0067] In some embodiments, the thickness of the fifth main body portion and the thickness of the sixth main body portion are both equal to the thickness of the second main body portion.

[0068] In the above technical solution, the thickness of the fifth main body and the thickness of the sixth main body are equal to the thickness of the second main body, which reduces the complexity of the equipment used to manufacture the fifth main body, the sixth main body and the second main body, improves the production qualification rate of the fifth main body, the sixth main body and the second main body, and facilitates the processing of the fifth main body, the sixth main body and the second main body.

[0069] In some embodiments, the third body portion and the fifth body portion at least partially overlap in a third direction, and the overlapping area of ​​the third body portion and the fifth body portion is connected to the first insulating member.

[0070] In the above technical solution, the third main body and the fifth main body overlap at least partially in the third direction, so that the third main body and the fifth main body can cover the third surface to insulate and isolate the third surface from the housing, thereby reducing the risk of short circuit between the electrode assembly and the housing. Simultaneously, the overlapping area of ​​the third main body and the fifth main body is connected to the first insulating member. Since the thickness of the overlapping area is greater than the thickness of either the third or fifth main body, the strength of the connection between the overlapping area and the first insulating member is greater than the strength of the connection between the third and fifth main body and the first insulating member alone, or the strength of the connection between the fifth main body and the first insulating member alone. This reduces the risk of breakage at the connection between the third main body and the first insulating member and the connection between the fifth main body and the first insulating member due to the inertia of the electrode assembly and the uneven stress on the second insulating member when the electrode assembly enters the housing.

[0071] In some embodiments, the fourth main body portion and the sixth main body portion at least partially overlap in a third direction, and the overlapping area of ​​the fourth main body portion and the sixth main body portion is connected to the first insulating member.

[0072] In the above technical solution, the fourth main body and the sixth main body overlap at least partially in the third direction, so that the fourth main body and the sixth main body can cover the fourth surface to insulate and isolate the fourth surface from the housing, thereby reducing the risk of short circuit between the electrode assembly and the housing. Simultaneously, the overlapping area of ​​the fourth main body and the sixth main body is connected to the first insulating member. Since the thickness of the overlapping area is greater than the thickness of either the fourth or sixth main body, the strength of the connection between the overlapping area and the first insulating member is greater than the strength of the connection between the fourth main body and the first insulating member alone, or the strength of the connection between the sixth main body and the first insulating member. This reduces the risk of breakage at the connection between the fourth main body and the first insulating member and the connection between the sixth main body and the first insulating member due to the inertia of the electrode assembly and the uneven stress on the second insulating member when the electrode assembly enters the housing.

[0073] In some embodiments, along the first direction, the electrode assembly has a fifth surface facing away from the first wall; the second insulating member further includes a seventh body portion that at least partially covers the fifth surface, the seventh body portion connecting the first body portion and the second body portion.

[0074] In the above technical solution, the second insulating member also includes a seventh main body portion, which at least partially covers the fifth surface to insulate and isolate the fifth surface from the outer shell, thereby reducing the risk of short circuit between the electrode assembly and the outer shell; at the same time, the seventh main body portion connects the first main body portion and the second main body portion, thereby improving the integrity of the second insulating member and facilitating the processing and manufacturing of the second insulating member.

[0075] In some embodiments, the electrode assembly includes a positive electrode and a negative electrode, the electrode assembly has a flat region, and the portion of the positive electrode located in the flat region and the portion of the negative electrode located in the flat region are stacked along the second direction.

[0076] In the above technical solution, the positive electrode portion located in the flat region and the negative electrode portion located in the flat region are stacked along the second direction, thereby making the first surface planar, which reduces the bending of the first main body and the first connecting part, thus facilitating the connection between the first connecting part and the first insulating member.

[0077] In some embodiments, the capacity of the battery cell is greater than 500Ah.

[0078] In the above technical solution, the larger the capacity of the battery cell, the greater the mass of the electrode assembly of the battery cell, which in turn leads to a greater inertia when it enters the casing. Since the thickness of the first connecting part is greater than the thickness of the first main body, the strength of the connection between the second insulating part and the first insulating part is strengthened, which reduces the risk of the connection between the first connecting part and the first insulating part breaking due to the greater inertia generated by the movement of the electrode assembly when it enters the casing.

[0079] In some embodiments, the dimension of the battery cell in the first direction is H1, the dimension of the battery cell in the second direction is T1, and the dimension of the battery cell in the third direction is W1, satisfying 3720cm. 3 ≤W1×T1×H1≤12500cm 3 The first direction, the second direction, and the third direction are perpendicular to each other.

[0080] In the above technical solution, since the volume of the battery cell is larger, the volume of the electrode assembly of the battery cell is larger, which makes the mass of the electrode assembly greater, resulting in greater inertia when it enters the casing. Since the thickness of the first connecting part is greater than the thickness of the first main body, the strength of the connection between the second insulating part and the first insulating part is strengthened, reducing the risk of breakage at the connection between the first connecting part and the first insulating part due to the greater inertia generated by the movement of the electrode assembly when it enters the casing.

[0081] In some embodiments, 120mm ≤ H1 ≤ 400mm.

[0082] In the above technical solution, since the larger the size of the battery cell in the first direction, the larger the volume of the battery cell when the size in other directions is constant, the larger the volume of the electrode assembly of the battery cell, and thus the larger the mass of the electrode assembly, resulting in greater inertia when it enters the casing. Therefore, the thickness of the first connecting part is set to be greater than the thickness of the first main body, so that the strength of the connection between the second insulating member and the first insulating member is strengthened, reducing the risk of breakage at the connection between the first connecting part and the first insulating member due to the large inertia generated by the movement of the electrode assembly when the electrode assembly enters the casing.

[0083] In some embodiments, 60mm≤T1≤150mm.

[0084] In the above technical solution, since the larger the size of the battery cell in the second direction, the larger the volume of the battery cell when the size in other directions is constant, the larger the volume of the electrode assembly of the battery cell, and thus the larger the mass of the electrode assembly, resulting in greater inertia when it enters the casing. Therefore, the thickness of the first connecting part is set to be greater than the thickness of the first main body, so that the strength of the connection between the second insulating member and the first insulating member is strengthened, reducing the risk of breakage at the connection between the first connecting part and the first insulating member due to the large inertia generated by the movement of the electrode assembly when the electrode assembly enters the casing.

[0085] In some embodiments, 200mm ≤ W1 ≤ 1500mm.

[0086] In the above technical solution, since the larger the size of the battery cell in the third direction, the larger the volume of the battery cell with the same size in other directions, the larger the volume of the electrode assembly of the battery cell, and thus the larger the mass of the electrode assembly, resulting in greater inertia when it enters the casing, the thickness of the first connecting part is set to be greater than the thickness of the first main body, so that the strength of the connection between the second insulating member and the first insulating member is strengthened, reducing the risk of breakage at the connection between the first connecting part and the first insulating member due to the large inertia generated by the movement of the electrode assembly when it enters the casing.

[0087] In some embodiments, the electrode assembly has a mass greater than 5 kg.

[0088] In the above technical solution, since the larger the mass of the electrode assembly, the greater its inertia when entering the shell, and since the thickness of the first connecting part is greater than the thickness of the first main body, the strength of the connection between the second insulating part and the first insulating part is strengthened, reducing the risk of the connection between the first connecting part and the first insulating part breaking due to the large inertia generated by the movement of the electrode assembly when the electrode assembly enters the shell.

[0089] In some embodiments, the housing includes a shell and a cover plate, the shell having an opening and the cover plate sealing the opening; the first wall is the cover plate, or the first wall is a wall portion of the shell opposite to the cover plate.

[0090] In the above technical solution, the opening design facilitates the placement of the electrode assembly inside the housing, and the cover plate seals the opening to form a sealed space, thereby providing a stable working environment for the electrode assembly and improving the reliability of the battery cell.

[0091] Secondly, embodiments of this application also provide a battery device, including the aforementioned battery cell.

[0092] Thirdly, embodiments of this application also provide an electrical device, including the aforementioned battery cell or battery device, wherein the battery cell is used to provide electrical energy. Attached Figure Description

[0093] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0094] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0095] Figure 2 Exploded views of the structure of the battery device provided in some embodiments of this application;

[0096] Figure 3 Exploded views of the structure of a single battery cell provided in some embodiments of this application;

[0097] Figure 4 This is a schematic diagram of the structure of the second insulating member not covering the first surface, provided in some embodiments of this application;

[0098] Figure 5This is a schematic diagram of the structure when the second insulating element covers the first surface, as provided in some embodiments of this application;

[0099] Figure 6 for Figure 5 Sectional view of AA;

[0100] Figure 7 This is a schematic diagram of the structure of a portion of the second insulating element provided in some embodiments of this application;

[0101] Figure 8 This is a schematic diagram of the structure of the first insulating element provided in some embodiments of this application;

[0102] Figure 9 This is a schematic diagram of the structure of the first connecting portion provided in some embodiments of this application;

[0103] Figure 10 Exploded view of the structure of a first type of first connection portion provided in some embodiments of this application;

[0104] Figure 11 A cross-sectional view of a second insulating element covering a first surface, provided in some embodiments of this application;

[0105] Figure 12 This is a schematic diagram of the structure of the second type of first connecting part after unfolding, provided in some embodiments of this application;

[0106] Figure 13 This is a schematic diagram of the structure of the third type of first connecting part after unfolding, provided in some embodiments of this application;

[0107] Figure 14 This is a schematic diagram of the structure of the second insulating member not covering the first and second surfaces, provided in some embodiments of this application;

[0108] Figure 15 This is a schematic diagram of the unfolded structure of the second insulating member provided in some embodiments of this application;

[0109] Figure 16 This is a cross-sectional view of a second insulating element covering a third or fourth surface, provided in some embodiments of this application.

[0110] Figure 17 The diagram shows the structure of a single battery cell provided in some embodiments of this application.

[0111] Icons: 1000 - Vehicle; 100 - Battery unit; 200 - Controller; 300 - Motor;

[0112] 10 - Box body; 11 - First box body; 12 - Second box body;

[0113] 20 - Battery cell; 21 - Casing; 211 - First wall; 22 - Electrode assembly; 221 - First tab; 222 - Second tab; 223 - Body; 22A - First surface; 22B - Second surface; 22C - Third surface; 22D - Fourth surface; 22E - Fifth surface; 22F - Sixth surface;

[0114] 23-First insulating element; 231-Base; 232-Protrusion; 232A-First protrusion; 232B-Second protrusion; 232C-Third protrusion;

[0115] 24-Second insulating component; 241-First main body portion; 242-First connecting portion; 2421-First extension area; 2421A-First sub-extension area; 2421B-Second sub-extension area; 2421C-Third sub-extension area; 2421D-First hot melt area; 2422-First body area; 2422A-Second hot melt area;

[0116] 2423 - First sub-connecting part; 2423A - First sub-extension area; 2423B - First sub-body area; 2424 - Second sub-connecting part; 2424A - Second sub-extension area; 2424B - Second sub-body area;

[0117] 2425 - First notch groove; 2425A - Clearance hole;

[0118] 243 - Second main body part; 244 - Second connecting part; 245 - Third main body part; 2451 - Second groove; 246 - Fourth main body part; 2461 - Third groove; 247 - Fifth main body part; 2471 - Fourth groove; 248 - Sixth main body part; 2481 - Fifth groove; 249 - Seventh main body part; 2491 - Sixth groove; 2492 - Seventh groove;

[0119] 25-Adapter; 251-First Adapter; 252-Second Adapter;

[0120] 26 - Electrode terminal; 261 - First electrode terminal; 262 - Second electrode terminal;

[0121] X - First direction; Y - Second direction; Z - Third direction. Detailed Implementation

[0122] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0123] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0124] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0125] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0126] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0127] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0128] In this application, "multiple" means two or more (including two).

[0129] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0130] Battery cells include, but are not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc.

[0131] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, reduces the risk of short circuits while allowing active ions to pass through.

[0132] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0133] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0134] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0135] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxide may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM) 622 LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811 ), lithium nickel cobalt aluminum oxide (such as LiNi) 0.85 Co 0.15 Al 0.05 At least one of O2 and its modified compounds.

[0136] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, lithium source material, potassium metal, or sodium metal may also be filled and / or deposited within the foamed metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0137] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0138] As an example, the negative electrode current collector can be a metal foil, a foamed metal, or a composite current collector. For example, as a metal foil, it can be silver-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. Foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0139] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0140] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0141] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as battery negative electrode active materials may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0142] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0143] In some embodiments, the separator is a separator membrane. The separator membrane can be any known porous structure separator membrane with good chemical and mechanical stability.

[0144] As an example, the material of the separator may include at least one of glass fiber, nonwoven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator may be a single-layer film or a multi-layer composite film. When the separator is a multi-layer composite film, the materials of each layer may be the same or different. The separator may be a separate component located between the positive and negative electrodes, or it may be attached to the surfaces of the positive and negative electrodes.

[0145] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0146] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte can be liquid, gel-like, or solid. Liquid electrolytes include electrolyte salts and solvents.

[0147] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0148] In some embodiments, the solvent may include at least one selected from ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. Ether solvents may include one or more selected from ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ethers.

[0149] Among them, the gel electrolyte includes a polymer as the electrolyte backbone network, combined with an ionic liquid - lithium salt.

[0150] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0151] As an example, polymer solid electrolytes can be polyether (polyoxyethylene), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids-lithium salts, cellulose, etc.

[0152] As an example, inorganic solid electrolytes may include one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium germanium phosphate sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0153] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0154] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0155] In some implementations, the electrode assembly is a stacked structure.

[0156] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0157] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0158] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0159] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0160] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0161] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0162] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0163] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0164] The battery cell also includes an insulating film, which covers the outside of the electrode assembly. This insulating film can be a Mylar film. The Mylar film is applied after the electrode assembly is formed, through a Mylar coating process. The Mylar film serves to seal and protect the electrode assembly.

[0165] As an example, a battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0166] In some embodiments, the battery device can be a battery module, and when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0167] In some embodiments, the battery device may be a battery pack, which includes a housing and individual battery cells, with the individual battery cells or battery modules housed within the housing.

[0168] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0169] In some embodiments, the battery can be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0170] Batteries possess outstanding advantages such as high energy density, low environmental pollution, high power density, long lifespan, wide applicability, and low self-discharge coefficient, making them a crucial component of today's new energy development. The development of battery technology must simultaneously consider multiple design factors, such as performance parameters like energy density, cycle life, discharge capacity, and charge / discharge rate. Furthermore, battery reliability must also be taken into account.

[0171] In battery technology, to improve the reliability of individual battery cells, an insulating structure is typically placed between the outer periphery of the electrode assembly and the inner periphery of the casing. This includes the aforementioned insulating film, which is placed between the electrode assembly and the casing to insulate and isolate the side of the electrode assembly not covered by the insulating film from the lower plastic layer of the casing. The insulating film and the lower plastic layer are joined by heat fusion to completely cover the electrode assembly. However, when the electrode assembly is placed inside the casing, the inertia during its movement and the uneven stress on the insulating film can lead to a risk of breakage at the connection between the insulating film and the lower plastic layer, thus negatively impacting the reliability of the individual battery cell.

[0172] Based on the above considerations, in order to reduce the risk of insulating film cracking when the electrode assembly enters the housing during assembly and improve the reliability of the battery cell, this application provides a battery cell including a housing, an electrode assembly, a first insulating member, and a second insulating member; the housing has a first wall in a first direction; the electrode assembly is housed within the housing, and the electrode assembly has a first surface in a second direction, the second direction being perpendicular to the first direction; the first insulating member is disposed between the first wall and the electrode assembly; the second insulating member at least partially encloses the electrode assembly, the second insulating member including a first main body portion and a first connecting portion, the first main body portion at least partially covering the first surface, and in the first direction, the first connecting portion is connected to the end of the first main body portion near the first wall, and the first connecting portion is connected to the first insulating member; wherein, the thickness of the first connecting portion is greater than the thickness of the first main body portion.

[0173] In this battery cell structure, a first insulating member is disposed between a first wall and an electrode assembly; a second insulating member at least partially encloses the electrode assembly. The second insulating member includes a first main body and a first connecting portion. The first main body at least partially covers a first surface. In a first direction, the first connecting portion is connected to the end of the first main body near the first wall and is connected to the first insulating member. The thickness of the first connecting portion is greater than the thickness of the first main body. This results in a higher strength for the first connecting portion compared to the first main body, reducing the risk of breakage at the connection between the first connecting portion and the first insulating member due to the inertia of the electrode assembly and uneven stress on the first connecting portion when the electrode assembly enters the casing, thereby improving the reliability of the battery cell. On the other hand, the thickness of the first main body is less than that of the first connecting portion, reducing the space occupied by the first main body within the casing. This allows the electrode assembly to occupy more space within a given casing space, increasing the volume of the electrode assembly and thus increasing the energy density of the battery cell.

[0174] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery cells and battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0175] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0176] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle 1000. The battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to supply power to the vehicle 1000; for example, the battery device 100 can serve as the operating power source or general power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 controls the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0177] In some embodiments of this application, the battery device 100 can not only serve as the operating power or power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0178] Please refer to Figure 2 , Figure 2 This is an exploded view of the structure of a battery device 100 provided in some embodiments of this application. The battery device 100 includes a housing 10 and battery cells 20, the battery cells 20 being housed within the housing 10.

[0179] The housing 10 provides assembly space for the battery cell 20, and can adopt various structures. In some embodiments, the housing 10 may include a first housing body 11 and a second housing body 12, which overlap each other, and together define an assembly space for accommodating the battery cell 20. The second housing body 12 may be a hollow structure open at one end, and the first housing body 11 may be a plate-like structure, with the first housing body 11 covering the open side of the second housing body 12 so that the first housing body 11 and the second housing body 12 together define the assembly space; alternatively, the first housing body 11 and the second housing body 12 may both be hollow structures open on one side, with the open side of the first housing body 11 covering the open side of the second housing body 12.

[0180] Of course, the box 10 formed by the first box body 11 and the second box body 12 can be of various shapes, such as a cylinder, a cuboid, or a cube. For example, in... Figure 2 In the middle, the shape of box 10 is a cuboid.

[0181] In the battery device 100, there can be one or more battery cells 20 disposed within the housing 10. When there are multiple battery cells 20 disposed within the housing 10, they can be connected in series, in parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery device 100 can also consist of multiple battery cells 20 first connected in series, in parallel, or in a mixed configuration to form a battery module, and then multiple battery modules are connected in series, in parallel, or in a mixed configuration to form a whole, which is then housed within the housing 10.

[0182] In some embodiments, the battery device 100 may also include other structures. For example, the battery device 100 may also include a busbar for connecting multiple battery cells 20 to achieve electrical connection between the multiple battery cells 20.

[0183] Each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 20 can be in the form of a cuboid, cylinder, prism, or other shapes. For example, in... Figure 3In the middle, the battery cell 20 has a cuboid structure.

[0184] According to some embodiments of this application, refer to Figure 3 Please refer to further details. Figure 4 , Figure 5 and Figure 6 , Figure 3 This is an exploded view of the structure of a battery cell 20 provided in some embodiments of this application. Figure 4 This is a schematic diagram of the structure of the second insulating member 24 not covering the first surface 22A according to some embodiments of this application. Figure 5 This is a schematic diagram of the structure when the second insulating member 24 covers the first surface 22A according to some embodiments of this application. Figure 6 for Figure 5 A cross-sectional view of AA. This application provides a battery cell 20, including a housing 21, an electrode assembly 22, a first insulating member 23, and a second insulating member 24. The housing 21 has a first wall 211 in a first direction X. The electrode assembly 22 is housed within the housing 21 and has a first surface 22A in a second direction Y, which is perpendicular to the first direction X. The first insulating member 23 is disposed between the first wall 211 and the electrode assembly 22. The second insulating member 24 at least partially encloses the electrode assembly 22. The second insulating member 24 includes a first main body 241 and a first connecting portion 242. The first main body 241 at least partially covers the first surface 22A. In the first direction X, the first connecting portion 242 is connected to one end of the first main body 241 near the first wall 211 and is connected to the first insulating member 23. The thickness of the first connecting portion 242 is greater than the thickness of the first main body 241.

[0185] The housing 21 is a component for accommodating the electrode assembly 22. The housing 21 can also be used to accommodate an electrolyte, such as an electrolyte solution. In some embodiments, a receiving cavity is formed inside the housing 21 for accommodating the electrode assembly 22.

[0186] In some embodiments, the material of the housing 21 can be metal or a combination of metal and non-metal. For example, the housing 21 can be made of metal, such as aluminum, copper, iron, steel, or aluminum alloy; or, for example, parts of the housing 21 can be made of metal, while other parts can be made of non-metal, such as the cover plate of the housing 21 being made of metal, while other parts of the housing 21 are made of non-metallic materials. The housing 21 can be adapted to the shape of the electrode assembly 22. For example, in... Figure 3 In the case of electrode assembly 22 having a cuboid structure, a cuboid shell 21 can be selected.

[0187] In some embodiments, the housing 21 includes a shell and a cover plate, one end of the shell having an opening through which the electrode assembly 22 can be placed inside the shell. The shell may be made of a metallic material, such as aluminum, aluminum alloy, or nickel-plated steel. Two electrode terminals 26 are provided on the cover plate. One of the two electrode terminals 26 is a positive electrode terminal 26, and the other is a negative electrode terminal 26. The shell may be cuboid, cylindrical, or elliptical. Both electrode terminals 26 may be located on the cover plate, both on the shell, or one on the cover plate and the other on the shell.

[0188] The first wall 211 is part of the structure of the outer shell 21. The first wall 211 can be insulated to install the first electrode terminal 261 and the second electrode terminal 262.

[0189] Both the first electrode terminal 261 and the second electrode terminal 262 are insulated components mounted on the first wall 211. The first electrode terminal 261 and the second electrode terminal 262 are used for electrical connection with the positive and negative electrodes of the electrode assembly 22, respectively. This allows current to flow into the electrode assembly 22 through the first electrode terminal 261 and out of the electrode assembly 22 through the second electrode terminal 262; or, allows current to flow into the electrode assembly 22 through the second electrode terminal 262 and out of the electrode assembly 22 through the first electrode terminal 261.

[0190] The first wall 211 can be made of conductive materials, such as metals, for example, the first wall 211 can be made of materials such as aluminum, copper, iron, aluminum, steel or aluminum alloy.

[0191] In some embodiments, the first wall 211 may be a cover plate of the outer casing 21, and the casing of the outer casing 21 surrounds the edge of the first wall 211.

[0192] In some embodiments, the first wall 211 may be connected to the housing by welding, bonding, snap-fitting, or other connection methods. In some embodiments, the first wall 211 and the housing may be integrally formed.

[0193] The first direction X can be parallel to the height direction of the battery cell 20, and the second direction Y can be parallel to the width direction of the battery cell 20.

[0194] When the electrode assembly 22 is placed into the housing 21, the insertion direction can be parallel to the first direction X, and the first direction X can be parallel to the direction of gravity.

[0195] It should be noted that the electrode assembly 22 is the component in the battery cell 20 where the electrochemical reaction occurs. The electrode assembly 22 can have various structures; exemplarily, it can be a wound structure formed by winding a positive electrode, a separator, and a negative electrode. Exemplarily, the separator is a separator membrane, and the main material of the separator membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride.

[0196] In an embodiment where the electrode assembly 22 has a wound structure, the first direction X may be parallel to the winding axis of the electrode assembly 22.

[0197] For example, refer to Figure 3 The outer casing 21 can accommodate one electrode assembly 22 or multiple electrode assemblies 22, which are stacked along the second direction Y.

[0198] The first surface 22A refers to an outer surface of the electrode assembly 22 in the second direction Y. In an embodiment where the electrode assembly 22 consists of multiple electrodes stacked along the second direction Y, the first surface 22A refers to the surface of the outermost electrode in the second direction Y that is away from other electrodes.

[0199] In some embodiments, refer to Figure 3 The electrode assembly 22 includes a body 223, a first tab 221, and a second tab 222. Exemplarily, the body 223 has a sixth surface 22F facing the first wall 211 in a first direction X, and both the first tab 221 and the second tab 222 are disposed on the sixth surface 22F. The battery cell 20 also includes a first adapter 251 and a second adapter 252. The first adapter 251 is used to electrically connect the first tab 221 to the first electrode terminal 261. The second adapter 252 is used to electrically connect the second tab 222 to the second electrode terminal 262.

[0200] The main body 223 is the area where the electrode assembly 22 undergoes a chemical reaction within the battery cell 20. The main body 223 is a structure formed by winding together the area of ​​the positive electrode sheet coated with a positive active material layer, the separator, and the area of ​​the negative electrode sheet coated with a negative active material layer. It mainly relies on the movement of metal ions between the positive and negative electrode sheets with opposite polarities to work.

[0201] The first tab 221 and the second tab 222 are portions of the electrode assembly 22 used to guide current into the body 223 and out of the body 223, respectively. For example, the first tab 221 is used to guide current into the body 223, and the second tab 222 is used to guide current out of the body 223; or, the second tab 222 is used to guide current into the body 223, and the first tab 221 is used to guide current out of the body 223.

[0202] If the first tab 221 is used as the positive electrode of the input or output electrode assembly 22, then the first tab 221 is a component formed by stacking and connecting the regions on the positive electrode sheet that are not coated with a positive active material layer. Correspondingly, if the second tab 222 is used as the negative electrode of the output or input electrode assembly 22, then the second tab 222 is a component formed by stacking and connecting the regions on the negative electrode sheet that are not coated with a negative active material layer. If the first tab 221 is used as the negative electrode of the output or input electrode assembly 22, then the first tab 221 is a component formed by stacking and connecting the regions on the negative electrode sheet that are not coated with a negative active material layer. Correspondingly, if the second tab 222 is used as the positive electrode of the input or output electrode assembly 22, then the second tab 222 is a component formed by stacking and connecting the regions on the positive electrode sheet that are not coated with a positive active material layer. For example, in the embodiments of this application, the first tab 221 is used as the negative electrode of the output or input electrode assembly 22, and the second tab 222 is used as the positive electrode of the output or input electrode assembly 22.

[0203] A first insulating member 23 is disposed between the electrode assembly 22 and the first wall 211. The first insulating member 23 has insulating properties and can insulate and isolate the first wall 211 and the electrode assembly 22. For example, the first insulating member 23 can be the lower plastic of the battery cell 20.

[0204] In some embodiments, the first insulating element 23 may be in the form of a sheet, plate, or ring.

[0205] In some embodiments, the first insulating element 23 may be a rubber element, a silicone element, or a plastic element, etc.

[0206] In some embodiments, the first insulating element 23 is made of an insulating material, such as polypropylene, polyethylene, or other materials with insulating properties.

[0207] The connection between the first insulating component 23 and the first wall 211 includes, but is not limited to, injection molding, bonding, snap-fitting, or other connection methods such as connecting through other connecting components.

[0208] The second insulating element 24 can seal, protect and insulate the electrode assembly 22. For example, the second insulating element 24 can be a Mylar membrane.

[0209] The first main body 241 is the portion of the second insulating member 24 used to at least cover the first surface 22A.

[0210] Reference Figure 4The first main body 241 being the portion of the second insulating member 24 used to at least cover the first surface 22A can be understood as a portion of the first main body 241 covering the first surface 22A. The electrode assembly 22 has a third surface 22C and a fourth surface 22D disposed opposite to each other in the third direction Z. The third surface 22C and the fourth surface 22D are disposed adjacent to the first surface 22A. A portion of the first main body 241 can extend beyond both sides of the first surface 22A in the third direction Z and fold towards the third surface 22C and the fourth surface 22D respectively to cover part or completely cover the third surface 22C and the fourth surface 22D. The electrode assembly 22 has a fifth surface 22E in the first direction X, away from the first wall 211. The fifth surface 22E is disposed adjacent to the first surface 22A. A portion of the first main body 241 can extend beyond the first surface 22A in the first direction X, away from the first wall 211, and fold towards the fifth surface 22E respectively to cover part or completely cover the fifth surface 22E.

[0211] The third direction Z can be parallel to the length direction of the battery cell 20, and the first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0212] The first connecting portion 242 is the part of the second insulating member 24 that connects to the first main body portion 241 and is used for connecting to the first insulating member 23. For clarity, please refer to [reference needed] when showing the extent of the first connecting portion 242 of the second insulating member 24 after the first surface 22A is completely covered. Figure 5 The area where the first connecting part 242 is located is marked by a dashed line in the figure. It should be noted that the dashed line is only for the purpose of showing the area of ​​the first connecting part 242 and does not represent any physical meaning.

[0213] For example, refer to Figure 5 After the first body portion 241 covers the first surface 22A, along the first direction X, the first connecting portion 242 is located between the first body portion 241 and the first wall 211 and is connected to the first insulating member 23.

[0214] In some embodiments, the first connecting portion 242 may be connected to the first insulating member 23 by welding, hot-melt connection, bonding or other connection methods.

[0215] In some embodiments, the first main body 241 and the first connecting part 242 are designed separately, and the first connecting part 242 can be connected to the first main body 241 by welding, hot melt connection, bonding or other connection methods.

[0216] In some embodiments, the first main body 241 and the first connecting part 242 are integrally formed, and the first main body 241 and the first connecting part 242 are formed into two regions with different thicknesses by injection molding or roll forming.

[0217] In some embodiments, refer to Figure 6 Within the same projection plane perpendicular to the second direction Y, the orthographic projections of the tab and the adapter plate fall into the overall projection of the first connecting portion 242. In other words, when viewed along the second direction Y, the first connecting portion 242 shares at least a portion of the space with the tab and the adapter plate. This reduces the impact of the first connecting portion 242 on the main body 223 of the electrode assembly 22.

[0218] In this embodiment, the thickness of the first connecting portion 242 is greater than the thickness of the first main body portion 241. On the one hand, this makes the strength of the first connecting portion 242 higher than that of the first main body portion 241, thereby reducing the risk of breakage at the connection between the first connecting portion 242 and the first insulating member 23 due to the inertia of the electrode assembly 22 and uneven stress on the first connecting portion 242 when the electrode assembly 22 enters the housing 21. On the other hand, the thickness of the first main body portion 241 is less than that of the first connecting portion 242, reducing the space occupied by the first main body portion 241 within the housing 21. Thus, with a fixed space within the housing 21, the electrode assembly 22 can occupy more space, thereby increasing the volume of the electrode assembly 22 and increasing the energy density of the battery cell 20.

[0219] According to some embodiments of this application, please refer to Figure 5 and Figure 6 The maximum width of the first connecting part 242 in the first direction X is B, which satisfies 0 < B ≤ 10 mm.

[0220] The maximum width of the first connecting portion 242 in the first direction X is from the end of the first connecting portion 242 furthest from the first main body portion 241 in the first direction X to the first end of the first main body portion 241 closest to the first connecting portion 242 in the first direction X.

[0221] B can be any point value or a range between any two of the following: 0.2mm, 0.4mm, 0.6mm, 0.8mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm.

[0222] In this embodiment, when B > 0, the first connecting portion 242 can have a certain size in the first direction X to connect with the first insulating member 23; when B ≤ 10 mm, the size of the first connecting portion 242 in the first direction X can be reduced. On the one hand, this reduces the risk of lithium plating in the electrode assembly 22 due to the first connecting portion 242 being inserted into the surface of the electrode assembly 22 facing the first wall 211 in the first direction X, thereby improving the reliability of the battery cell 20; on the other hand, it reduces the risk of lithium plating in the electrode assembly 22 due to the first connecting portion 242 squeezing the surface of the electrode assembly 22 facing the first wall 211 in the first direction X at the edge of the second direction Y, thereby improving the reliability of the battery cell 20. Therefore, when 0 < B ≤ 10 mm, the first connecting portion 242 can have a certain size in the first direction X to connect with the first insulating member 23, while reducing the risk of lithium plating in the electrode assembly 22, thereby improving the reliability of the battery cell 20.

[0223] According to some embodiments of this application, please refer to Figure 5 and Figure 6 , 3.5mm≤B≤7mm.

[0224] B can be any point value or a range between any two of the following: 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm.

[0225] In this embodiment, when B ≥ 3.5 mm, the first connecting portion 242 has sufficient dimensions in the first direction X to connect with the first insulating member 23, thereby further increasing the reliability of the connection between the first connecting portion 242 and the first insulating member 23. Therefore, when 3.5 mm < B ≤ 10 mm, the first connecting portion 242 can improve the reliability of the connection between the first connecting portion 242 and the first insulating member 23, while reducing the risk of lithium plating in the electrode assembly 22, thereby improving the reliability of the battery cell 20.

[0226] According to some embodiments of this application, please refer to Figure 5 and Figure 6 The thickness of the first connecting part 242 in the second direction Y is A, which satisfies 0.2mm≤A≤0.5mm.

[0227] The thickness of the first connecting portion 242 in the second direction Y is the distance between the side of the first connecting portion 242 in the second direction Y for connecting with the first insulating member 23 and the side of the first connecting portion 242 in the second direction Y away from the first insulating member 23.

[0228] A can be any point value or a range between any two of the following: 0.2mm, 0.21mm, 0.22mm, 0.23mm, 0.24mm, 0.25mm, 0.26mm, 0.27mm, 0.28mm, 0.29mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm.

[0229] In this embodiment, when A ≥ 0.2 mm, the first connecting portion 242, having a certain length, has a cross-section with a plane perpendicular to the first direction X that has a certain area. This results in the first connecting portion 242 having a certain strength, reducing the risk of breakage at the connection between the first connecting portion 242 and the first insulating member 23 due to the inertia of the electrode assembly 22 and uneven stress on the first connecting portion 242 when the electrode assembly 22 enters the housing 21. This improves the reliability of the battery cell 20. When A ≤ 0.5 mm, it reduces the risk of the first connecting portion 242 not being properly melted by the heating device when the first connecting portion 242 and the first insulating member 23 are joined by heat fusion, thus improving the reliability of the battery cell 20. This reduces the risk of reduced connection strength, thereby improving the reliability of the thermal fusion connection between the first connecting part 242 and the first insulating member 23. Therefore, when 0.2mm≤A≤0.5mm, the first connecting part 242 can reduce the risk of breakage at the connection between the first connecting part 242 and the first insulating member 23 due to the inertia of the electrode assembly 22 and uneven stress on the first connecting part 242 when the electrode assembly 22 enters the housing 21, thereby improving the reliability of the battery cell 20. At the same time, it can reduce the risk of reduced connection strength caused by the first connecting part 242 not being properly melted by the heating device when the first connecting part 242 and the first insulating member 23 are thermally fused, thereby improving the reliability of the thermal fusion connection between the first connecting part 242 and the first insulating member 23.

[0230] According to some embodiments of this application, please refer to Figure 5 and Figure 6 , 0.2mm≤A≤0.45mm.

[0231] A can be any point value from 0.2mm, 0.21mm, 0.22mm, 0.23mm, 0.24mm, 0.25mm, 0.26mm, 0.27mm, 0.28mm, 0.29mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, or any range between two of these values.

[0232] In this embodiment, when A ≤ 0.45 mm, the risk of reduced connection strength due to the first connecting part 242 not being properly melted by the heating device when the first connecting part 242 and the first insulating part 23 are connected by heat fusion can be further reduced, thereby further improving the reliability of the heat fusion connection between the first connecting part 242 and the first insulating part 23. Therefore, when 0.2 mm ≤ A ≤ 0.45 mm, the first connecting part 242 can reduce the risk of breakage at the connection between the first connecting part 242 and the first insulating part 23 due to the inertia of the electrode assembly 22 and uneven stress on the first connecting part 242 when the electrode assembly 22 enters the outer casing 21, thereby improving the reliability of the battery cell 20. At the same time, it can further reduce the risk of reduced connection strength due to the first connecting part 242 not being properly melted by the heating device when the first connecting part 242 and the first insulating part 23 are connected by heat fusion, thereby further improving the reliability of the heat fusion connection between the first connecting part 242 and the first insulating part 23.

[0233] According to some embodiments of this application, please refer to Figure 5 and Figure 6 The length of the first connecting part 242 in the third direction Z is L, which satisfies 0 < L ≤ 350 mm, and the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0234] The length of the first connecting part 242 in the third direction Z is the distance between the two ends of the first connecting part 242 that are relatively disposed in the third direction Z.

[0235] L can be any point value or a range between any two of the following: 2mm, 4mm, 6mm, 8mm, 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 150mm, 200mm, 250mm, 300mm, 350mm.

[0236] In this embodiment, when L≤350mm, the first connecting portion 242 will not extend beyond the first surface 22A of the electrode assembly 22 in the third direction Z, so that the first connecting portion 242 will not extend to the side of the electrode assembly 22 adjacent to the first surface 22A. This makes the first connecting portion 242 overlap with the rest of the second insulating member 24, resulting in an excessively thick overlapping portion. This reduces the risk that the overlapping portion cannot be well melted by the heating device due to excessive thickness, thus reducing the connection strength. This improves the reliability of the thermal fusion connection between the second insulating member 24 and the first insulating member 23.

[0237] According to some embodiments of this application, please refer to Figure 5 and Figure 6 , 170mm≤L≤350mm.

[0238] L can be any point value or a range of any two of the following: 170mm, 180mm, 190mm, 200mm, 210mm, 220mm, 230mm, 240mm, 250mm, 260mm, 270mm, 280mm, 290mm, 300mm, 310mm, 320mm, 330mm, 340mm, 350mm.

[0239] In this embodiment, when L≥170mm, the first connecting portion 242 has a certain size in the third direction Z, which facilitates the thermal fusion connection between the first connecting portion 242 and the structure on the first insulating member 23 for thermal fusion. Therefore, when 170mm≤L≤350mm, the first connecting portion 242 can be easily thermally fused with the structure on the first insulating member 23 for thermal fusion, while ensuring that the first connecting portion 242 does not extend to the side of the electrode assembly 22 adjacent to the first surface 22A. This prevents the first connecting portion 242 from overlapping with the rest of the second insulating member 24, resulting in an excessively thick overlapping portion. This reduces the risk that the overlapping portion cannot be properly melted by the heating device due to excessive thickness, thus reducing the connection strength. This improves the reliability of the thermal fusion connection between the second insulating member 24 and the first insulating member 23.

[0240] According to some embodiments of this application, please refer to Figure 7 and Figure 8 , Figure 7 This is a schematic diagram of the structure of some of the second insulating members 24 provided in some embodiments of this application. Figure 8 This is a schematic diagram of the structure of the first insulating member 23 provided in some embodiments of this application. The first connecting portion 242 includes a plurality of first extension regions 2421, which are spaced apart along a third direction Z, and the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0241] In some embodiments, the first insulating member 23 has a protrusion 232 extending toward the electrode assembly 22 in the first direction X on the side facing the electrode assembly 22. The protrusion 232 is used to abut against the body 223 of the electrode assembly 22 to restrict the movement of the electrode assembly 22 in the first direction X.

[0242] The first extension region 2421 is a portion of the first connecting portion 242 used to connect with the protrusion 232 on the first insulating member 23 on one side in the second direction Y.

[0243] The shape of the first extension region 2421 can be varied; for example, refer to Figure 7 The first extension area 2421 is rectangular.

[0244] In this embodiment, the first connecting portion 242 includes a plurality of first extension regions 2421, which are spaced apart along the third direction Z to facilitate heat fusion with the corresponding heat fusion structure on the first insulating member 23.

[0245] According to some embodiments of this application, please refer to Figure 7 and Figure 8 The first insulating member 23 includes a base 231 and a plurality of protrusions 232. Along the first direction X, the plurality of protrusions 232 protrude from the side of the base 231 facing the electrode assembly 22 and are spaced apart along the third direction Z. A plurality of first extension areas 2421 are connected to the plurality of protrusions 232 in a one-to-one correspondence.

[0246] The substrate 231 has a protrusion 232 on the side facing the electrode assembly 22. The protrusion 232 is the part of the first insulating member 23 used for contacting the electrode assembly 22.

[0247] The shape of the protrusion 232 can be varied; for example, refer to Figure 8 The convex part 232 is rectangular.

[0248] The connection between the protrusion 232 and the substrate 231 includes, but is not limited to, injection molding, bonding, snap-fitting, or other connection relationships through other connecting components.

[0249] In some embodiments, refer to Figure 7 and Figure 8The plurality of protrusions 232 include a first protrusion 232A, a second protrusion 232B, and a third protrusion 232C, which are sequentially spaced along a third direction Z. The first protrusion 232A abuts against the portion of the body 223 located on the side of the first tab 221 away from the second tab 222. The third protrusion 232C abuts against the portion of the body 223 located on the side of the second tab 222 away from the first tab 221. The second protrusion 232B abuts against the portion of the body 223 located between the first tab 221 and the second tab 222. This allows the middle portion of the first insulating member 23 to be supported by the electrode assembly 22. The first adapter 251, the first tab 221, the second adapter 252, and the second tab 222 are isolated, thereby reducing the risk of internal short circuits in the battery cell 20 caused by the overlap of the first adapter 251 and the second adapter 252, and improving the reliability of the battery cell 20. At the same time, the first protrusion 232A, the second protrusion 232B, and the third protrusion 232C all abut against the main body 223, thereby reducing the risk of internal short circuits in the battery cell 20 caused by the first adapter 251 and the second adapter 252 abutting against the main body 223 due to contact with the first insulating member 23. The plurality of first extension regions 2421 include a first sub-extension region 2421A, a second sub-extension region 2421B, and a third sub-extension region 2421C arranged sequentially at intervals along the first direction X. Specifically, the first extension region 2421A is connected to the first protrusion 232A on the side facing the first connecting portion 242 in the second direction Y; the second extension region 2421B is connected to the second protrusion 232B on the side facing the first connecting portion 242 in the second direction Y; and the third extension region 2421C is connected to the third protrusion 232C on the side facing the first connecting portion 242 in the second direction Y. This fully utilizes the structure of the protrusion 232 of the first insulating member 23 for connection with it, making the internal structure of the battery cell 20 more compact and reducing wasted space within the casing 21. This allows for the placement of a larger electrode assembly 22, thereby increasing the energy density of the battery cell 20. Meanwhile, the first extension area 2421A, the second extension area 2421B, and the third extension area 2421C are connected one-to-one with the first protrusion 232A, the second protrusion 232B, and the third protrusion 232C to maximize the connection area between the first insulating member 23 and the first connecting part 242, thereby increasing the reliability of the connection between the first insulating member 23 and the first connecting part 242.

[0250] In this embodiment, the first insulating member 23 includes a base 231 and a plurality of protrusions 232. On the one hand, along the first direction X, the plurality of protrusions 232 protrude from the side of the base 231 facing the electrode assembly 22 and are spaced apart along the third direction Z, so that the protrusions 232 can insulate and isolate the electrode tabs of the electrode assembly 22 with opposite polarity or other battery cell 20 structural components connected to the electrode tabs with opposite polarity. On the other hand, the plurality of first extension areas 2421 are connected one-to-one with the plurality of protrusions 232 to increase the connection area between the first insulating member 23 and the first connecting portion 242 as much as possible, thereby increasing the reliability of the connection between the first insulating member 23 and the first connecting portion 242.

[0251] According to some embodiments of this application, please refer to Figure 7 The first connecting portion 242 also includes a first body region 2422. In the first direction X, the first body region 2422 is connected to the end of the first main body portion 241 near the first wall 211, and the first body region 2422 extends in the third direction Z. A plurality of first extension regions 2421 are connected to the first body region 2422 and protrude from the first body region 2422 in the first direction X.

[0252] The first body region 2422 can be the area in the first connecting portion 242 that connects the first main body portion 241 and the first extension region 2421.

[0253] In embodiments where the first connecting portion 242 and the first main body 223 are separate, the first main body region 2422 connects to a plurality of first extension regions 2421. Therefore, during installation, instead of connecting the plurality of first extension regions 2421 and the first main body portion 241 separately, by connecting the first main body region 2422 and the first main body portion 241 to connect the plurality of first extension regions 2421 and the first main body portion 241, the connection of the plurality of first extension regions 2421 and the first main body portion 241 can be completed more quickly, thereby reducing the processing time of the second insulating member 24 and facilitating the processing and manufacturing of the second insulating member 24.

[0254] In this embodiment, a plurality of first extension areas 2421 are connected through the first body area 2422, and the plurality of first extension areas 2421 and the first main body 223 are connected through the first body area 2422, thereby increasing the integrity of the first connecting part 242 and facilitating the processing and manufacturing of the first connecting part 242.

[0255] According to some embodiments of this application, please refer to Figure 9 and Figure 10 , Figure 9 This is a schematic diagram of the structure of the first connecting portion 242 provided in some embodiments of this application. Figure 10An exploded view of the structure of a first connecting portion 242 provided in some embodiments of this application. The first connecting portion 242 includes a first sub-connecting portion 2423 and a second sub-connecting portion 2424, which are stacked along a second direction Y. The first sub-connecting portion 2423 and the second sub-connecting portion 2424 are thermally fused together to form a first thermally fused region 2421D and a second thermally fused region 2422A, which are spaced apart along a third direction Z. At least a portion of the first thermally fused region 2421D is located in a first extension region 2421, and the second thermally fused region 2422A is located in a first body region 2422. The size of the first thermally fused region 2421D in the first direction X is larger than the size of the second thermally fused region 2422A in the first direction X.

[0256] The first sub-connecting portion 2423 and the second sub-connecting portion 2424 are two bodies of the first connecting portion 242, and at least one of the first sub-connecting portion 2423 and the second sub-connecting portion 2424 is connected to the first main body portion 241.

[0257] In some embodiments, the first main body 241 and the first connecting part 242 are designed separately, and at least one of the first sub-connecting part 2423 and the second sub-connecting part 2424 can be connected to the first main body 241 by welding, hot-melt connection, bonding or other connection methods.

[0258] In some embodiments, at least one of the first main body portion 241, the first sub-connecting portion 2423, and the second sub-connecting portion 2424 is integrally formed by injection molding or roll forming or the like.

[0259] In some embodiments, the first connecting portion 242 may further include a third sub-connecting portion, a fourth sub-connecting portion, and so on, with the multiple sub-connecting portions stacked along the second direction Y such that the thickness of the first connecting portion 242 is greater than the thickness of the first main body portion 241.

[0260] The first sub-connecting portion 2423 and the second sub-connecting portion 2424 are thermally fused together. That is, a portion of the first sub-connecting portion 2423 and a portion of the second sub-connecting portion 2424 are fused together and then fixedly connected, so that a portion of the first sub-connecting portion 2423 and a portion of the second sub-connecting portion 2424 are fused together as one unit. Exemplarily, the thermal fusion connection between the first sub-connecting portion 2423 and the second sub-connecting portion 2424 can be achieved in various ways. For example, the first sub-connecting portion 2423 and the second sub-connecting portion 2424 can be partially melted by high-temperature melting to achieve the thermal fusion connection between them.

[0261] The first hot-melting zone 2421D and the second hot-melting zone 2422A are regions that connect the first sub-connecting portion 2423 and the second sub-connecting portion 2424 by heating one or both of the first sub-connecting portion 2423 and the second sub-connecting portion 2424, causing a portion of one or both of the first sub-connecting portion 2423 and the second sub-connecting portion 2424 to melt and join together.

[0262] To clearly show the range of the first hot melt zone 2421D and the second hot melt zone 2422A, please refer to... Figure 9 The area of ​​the first hot melt zone 2421D and the second hot melt zone 2422A is marked by dashed lines or pattern fills in the figure. It should be noted that the dashed lines and pattern fills are only for the purpose of showing the area of ​​the first hot melt zone 2421D and the second hot melt zone 2422A and do not represent any physical meaning.

[0263] For clarity, please refer to the following: (The text abruptly ends here, so the translation will stop here as well.) Figure 9 The area of ​​the first extension area 2421 and the first body area 2422 is marked by dashed lines in the figure. It should be noted that the dashed lines are only for the purpose of showing the area of ​​the first extension area 2421 and the first body area 2422 and do not represent any entity.

[0264] The first hot melt zone 2421D and the second hot melt zone 2422A can be of various shapes, such as circular, square, and polygonal, as shown in the reference. Figure 9 Both the first hot melt zone 2421D and the second hot melt zone 2422A are rectangular.

[0265] In some embodiments, refer to Figure 10 The first sub-connecting portion 2423 includes a first sub-extension region 2423A and a first sub-body region 2423B. The second sub-connecting portion 2424 includes a second sub-extension region 2424A and a second sub-body region 2424B. The first sub-extension region 2423A and the second sub-extension region 2424A are stacked along the second direction Y to form a first extension region 2421. The first sub-body region 2423B and the second sub-body region 2424B are stacked along the second direction Y to form a first body region 2422.

[0266] At least a portion of the first hot melt zone 2421D is located in the first extension zone 2421, which may mean that a portion of the first hot melt zone 2421D is located within the first extension zone 2421; a portion of the first hot melt zone 2421D extends along the first direction X to the first body zone 2422.

[0267] For example, a portion of the first sub-extension region 2423A and a portion of the second sub-extension region 2424A are thermally fused together to form a portion of the first thermally fused region 2421D; a portion of the first sub-body region 2423B and a portion of the second sub-body region 2424B are thermally fused together to form another portion of the first thermally fused region 2421D.

[0268] The second hot melt zone 2422A being located in the first body zone 2422 can mean that the second hot melt zone 2422A is located within the first body zone 2422.

[0269] A portion of the first sub-body region 2423B and a portion of the second sub-body region 2424B are thermally fused together to form a second thermally fused region 2422A.

[0270] It is understandable that the orthographic projection of the second hot melt zone 2422A and the orthographic projection of the first extension zone 2421 on the projection plane perpendicular to the first direction X do not overlap.

[0271] The size of the first hot melt zone 2421D in the first direction X is larger than that of the second hot melt zone 2422A in the first direction X. Therefore, given that the sizes of the first hot melt zone 2421D and the second hot melt zone 2422A are constant in the third direction Z, the area of ​​the first hot melt zone 2421D is larger than that of the second hot melt zone 2422A. This results in the first sub-connecting portion 2423 and the second sub-connecting portion 2424 having a larger connection area in the first extension region 2421, thereby increasing the connection strength of the first sub-connecting portion 2423 and the second sub-connecting portion 2424 in the first extension region 2421 and reducing the risk of separation of the first sub-connecting portion 2423 and the second sub-connecting portion 2424 in the first extension region 2421.

[0272] In some embodiments, the first sub-connection portion 2423 and the second sub-connection portion 2424 are ultrasonically welded to form a first welding area and a second welding area, the first welding area and the second welding area are spaced apart along a third direction Z; at least a portion of the first welding area is located in the first extension area 2421, the second welding area is located in the first body area 2422, and the size of the first welding area in the first direction X is larger than the size of the second welding area in the first direction X.

[0273] In this embodiment, the size of the first hot melt zone 2421D in the first direction X is larger than the size of the second hot melt zone 2422A in the first direction X. Therefore, given that the sizes of the first hot melt zone 2421D and the second hot melt zone 2422A are constant in the third direction Z, the area of ​​the first hot melt zone 2421D is larger than the area of ​​the second hot melt zone 2422A. This results in the first sub-connecting portion 2423 and the second sub-connecting portion 2424 having a larger connection area in the first extension region 2421, thereby increasing the connection strength of the first sub-connecting portion 2423 and the second sub-connecting portion 2424 in the first extension region 2421. This reduces the risk of the first sub-connecting portion 2423 and the second sub-connecting portion 2424 separating in the first extension region 2421, and further improves the strength of the connection area between the first connecting portion 242 and the first insulating member 23. This reduces the risk of breakage at the connection between the first connecting portion 242 and the first insulating member 23 due to the inertia of the electrode assembly 22 and uneven stress on the first connecting portion 242 when the electrode assembly 22 enters the housing 21.

[0274] According to some embodiments of this application, please refer to Figure 9 A portion of the first hot melt zone 2421D is located in the first extension zone 2421, and another portion of the first hot melt zone 2421D is located in the first body zone 2422.

[0275] In this embodiment, a portion of the first hot melt zone 2421D is located in the first extension zone 2421, and another portion of the first hot melt zone 2421D is located in the first body zone 2422. This increases the strength of the area in the first connection portion 242 adjacent to the connection area between the first connection portion 242 and the first insulating member 23 in the first direction X, thereby reducing the risk of this portion breaking when the electrode assembly 22 enters the housing 21 due to the inertia of the electrode assembly 22 and the uneven force on the first connection portion 242.

[0276] According to some embodiments of this application, please refer to Figure 9 The first extension region 2421 protrudes from the first body region 2422 in the first direction X by a size of B1, which satisfies 0 < B1 ≤ 10 mm.

[0277] The first extension region 2421 protrudes from the first body region 2422 in the first direction X by a size equal to the width of the first extension region 2421, which is the distance between the end of the first extension region 2421 away from the first body region 2422 in the first direction X and the end of the first body region 2422 close to the first extension region 2421 in the first direction X.

[0278] B1 can be any point value from 0.2mm, 0.4mm, 0.6mm, 0.8mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, or any range between two of them.

[0279] In this embodiment, when B1 > 0, the first extension region 2421 can have a certain size in the first direction X to connect with the first insulating member 23; when B1 ≤ 10 mm, the size of the first extension region 2421 in the first direction X can be reduced. On the one hand, this reduces the risk of lithium plating in the electrode assembly 22 due to the first extension region 2421 being inserted into the surface of the electrode assembly 22 facing the first wall 211 in the first direction X, thereby improving the reliability of the battery cell 20; on the other hand, it reduces the risk of lithium plating in the electrode assembly 22 due to the first extension region 2421 squeezing the surface of the electrode assembly 22 facing the first wall 211 in the first direction X at the edge of the second direction Y, thereby improving the reliability of the battery cell 20. Therefore, when 0 < B1 ≤ 10 mm, the first extension region 2421 can have a certain size in the first direction X to connect with the first insulating member 23, while reducing the risk of lithium plating in the electrode assembly 22, thereby improving the reliability of the battery cell 20.

[0280] According to some embodiments of this application, please refer to Figure 9 , 3.5mm≤B1≤7mm.

[0281] B1 can be any point value from 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, or any range between two of these values.

[0282] In this embodiment, when B1 ≥ 3.5 mm, the first extension region 2421 has sufficient dimensions in the first direction X to connect with the first insulating member 23, thereby further increasing the reliability of the connection between the first extension region 2421 and the first insulating member 23. Therefore, when 3.5 mm < B1 ≤ 10 mm, the first extension region 2421 can improve the reliability of the connection between the first extension region 2421 and the first insulating member 23, while reducing the risk of lithium plating in the electrode assembly 22, thereby improving the reliability of the battery cell 20.

[0283] According to some embodiments of this application, please refer to Figure 9 The first extension region 2421 has a dimension of L1 in the third direction Z, which satisfies 12mm≤L1≤25mm.

[0284] The dimension of the first extension region 2421 in the third direction Z is the length of the first extension region 2421, which is the distance between the two sides of the first extension region 2421 that are set opposite to each other in the third direction Z.

[0285] L1 can be any point value or a range of any two of the following: 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm.

[0286] In this embodiment, when L1 ≥ 12 mm, the first extension area 2421 can better cover the protrusion 232 of the first insulating member 23 and the heating mechanism of the heating device in the first direction X, so as to facilitate the thermal fusion connection between the first extension area 2421 and the protrusion 232 of the first insulating member 23. When L1 ≤ 25 mm, the area of ​​the first extension area 2421 can be reduced, thereby reducing the volume of the first connecting part 242, and thus reducing the material usage of the first connecting part 242, thereby reducing the manufacturing cost of the first connecting part 242. Therefore, when 12 mm ≤ L1 ≤ 25 mm, the first extension area 2421 can better cover the protrusion 232 of the first insulating member 23 and the heating mechanism of the heating device in the first direction X, so as to facilitate the thermal fusion connection between the first extension area 2421 and the protrusion 232 of the first insulating member 23, while reducing the volume of the first connecting part 242, thereby reducing the material usage of the first connecting part 242, and thus reducing the manufacturing cost of the first connecting part 242.

[0287] According to some embodiments of this application, please refer to Figure 9 , 12mm≤L1≤20mm.

[0288] L1 can be any point value from 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, or a range between any two.

[0289] In this embodiment, when L1 ≤ 20 mm, the area of ​​the first extension region 2421 can be further reduced, thereby reducing the volume of the first connecting portion 242, and thus reducing the material usage of the first connecting portion 242, thereby further reducing the manufacturing cost of the first connecting portion 242. Therefore, when 12 mm ≤ L1 ≤ 25 mm, the first extension region 2421 can better cover the protrusion 232 of the first insulating member 23 and the heating mechanism of the heating device in the first direction X, so that the first extension region 2421 and the protrusion 232 of the first insulating member 23 can be thermally fused together, while further reducing the volume of the first connecting portion 242, thereby reducing the material usage of the first connecting portion 242, and thus further reducing the manufacturing cost of the first connecting portion 242.

[0290] According to some embodiments of this application, please refer to Figure 10The first connecting portion 242 includes a first sub-connecting portion 2423 and a second sub-connecting portion 2424. The first sub-connecting portion 2423 and the second sub-connecting portion 2424 are stacked along the second direction Y. The first sub-connecting portion 2423 is integrally formed with the first main body portion 241.

[0291] For example, the first main body portion 241 and the first sub-connecting portion 2423 can be integrally formed by roll forming, or the first main body portion 241 and the first sub-connecting portion 2423 can be integrally formed by injection molding.

[0292] In this embodiment, the first sub-connecting portion 2423 is integrally formed with the first main body portion 241. On the one hand, this reduces the processing of the first sub-connecting portion 2423 and the steps of connecting the first main body portion 241 and the first sub-connecting portion 2423, making it easier to process the first main body portion 241 and part of the first connecting portion 242. On the other hand, it reduces the risk of weak points at the connection between the first main body portion 241 and the first sub-connecting portion 2423, and improves the connection reliability between the first connecting portions 242.

[0293] According to some embodiments of this application, please refer to Figure 11 , Figure 11 This is a cross-sectional view of the second insulating member 24 covering the first surface 22A according to some embodiments of this application. The thickness of the first sub-connecting portion 2423 is equal to the thickness of the first main body portion 241.

[0294] The thickness of the first sub-connecting portion 2423 refers to the distance between the opposite sides of the first sub-connecting portion 2423 in the second direction Y when the first connecting portion 242 is connected to the first insulating member 23.

[0295] The thickness of the first main body 241 refers to the distance between the opposite sides of the first main body 241 in the second direction Y when the first connecting part 242 is connected to the first insulating member 23.

[0296] Understandably, when the first sub-connecting part 2423 and the first main body part 241 are integrally formed by roll forming, the thickness of the first sub-connecting part 2423 is equal to the thickness of the first main body part 241. On the one hand, this eliminates the need for the pressure roller device used for roll forming to have a stepped portion to roll the first sub-connecting part 2423 and the first main body part 241 separately. On the other hand, since the thickness of the first sub-connecting part 2423 and the first main body part 241 are equal, the first sub-connecting part 2423 and the first main body part 241 can be arbitrarily cut into a specified shape from the roll-formed material without the need for precise positioning of the material. This ensures that the thickness of the area occupied by the first sub-connecting part 2423 is different from the thickness of the area occupied by the first main body part 241, thereby reducing the processing difficulty.

[0297] Understandably, when the first sub-connecting part 2423 and the first main body part 241 are integrally formed by injection molding, the thickness of the first sub-connecting part 2423 and the thickness of the first main body part 241 are equal, which makes the opposite sides of the mold flat, which facilitates the forming of the first sub-connecting part 2423 and the first main body part 241 and reduces the processing difficulty of the first sub-connecting part 2423 and the first main body part 241.

[0298] In this embodiment, the thickness of the first sub-connecting portion 2423 is equal to the thickness of the first main body portion 241, which reduces the complexity of the instruments used to manufacture the first sub-connecting portion 2423 and the first main body portion 241, improves the production qualification rate of the first sub-connecting portion 2423 and the first main body portion 241, and facilitates the processing of the first sub-connecting portion 2423 and the first main body portion 241.

[0299] According to some embodiments of this application, please refer to Figure 11 The second sub-connector 2424 is located between the first sub-connector 2423 and the first insulating member 23.

[0300] The second sub-connecting part 2424 being located between the first sub-connecting part 2423 and the first insulating member 23 means that when the first connecting part 242 is connected to the first insulating member 23, along the second direction Y, the second sub-connecting part 2424 is located between the first sub-connecting part 2423 and the first insulating member 23.

[0301] Understandably, the first main body 241 can limit the first sub-connecting portion 2423 to restrict the movement of the first sub-connecting portion 2423 in the second direction Y when the first main body 241 covers the first surface 22A. This restricts the movement of the second sub-connecting portion 2424 in the second direction Y by the first sub-connecting portion 2423 and the first insulating member 23, thereby reducing the risk of a gap between the first connecting portion 242 and the first insulating member 23 caused by the folding of the part of the second sub-connecting portion 2424 that is not connected to the first sub-connecting portion 2423. This also reduces the risk of poor forming of the hot-melt area when the first connecting portion 242 and the first insulating member 23 are hot-melted together.

[0302] In this embodiment, the second sub-connecting part 2424 is located between the first sub-connecting part 2423 and the first insulating member 23. When the first connecting part 242 and the first insulating member 23 are heat-fused together, the second sub-connecting part 2424 is limited in the second direction Y by the first sub-connecting part 2423 and the first insulating member 23, thereby reducing the risk of poor forming of the heat-fused area caused by the folding of the second sub-connecting part 2424 and improving the stability of the connection between the first connecting part 242 and the first insulating member 23.

[0303] According to some embodiments of this application, please refer to Figure 12 and Figure 13 , Figure 12 and Figure 13 This is a schematic diagram of the unfolded structure of two first connecting portions 242 provided in some embodiments of this application. The first sub-connecting portion 2423 and the second sub-connecting portion 2424 are integrally formed. Along the first direction X, the end of the first sub-connecting portion 2423 away from the first connecting portion 242 is connected to the second sub-connecting portion 2424.

[0304] For example, the first sub-connecting portion 2423 and the second sub-connecting portion 2424 can be integrally formed by roll forming, or the first sub-connecting portion 2423 and the second sub-connecting portion 2424 can be integrally formed by injection molding.

[0305] The second sub-connecting part 2424 is folded toward the first sub-connecting part 2423 to be attached to one side of the first sub-connecting part 2423 in the second direction Y, and then stacked with the first sub-connecting part 2423 along the second direction Y.

[0306] In this embodiment, the first sub-connecting portion 2423 and the second sub-connecting portion 2424 are integrally formed, thereby reducing the processing of the second sub-connecting portion 2424 and the process of connecting the first sub-connecting portion 2423 and the second sub-connecting portion 2424, and facilitating the processing of the first main body portion 241 and the first connecting portion 242.

[0307] According to some embodiments of this application, please refer to Figure 12 and Figure 13 A first groove 2425 is provided at the crease between the first sub-connecting part 2423 and the second sub-connecting part 2424.

[0308] In some embodiments, the first groove 2425 is a groove extending in the third direction Z.

[0309] In some embodiments, the first groove 2425 may be a plurality of strip holes spaced apart along the third direction Z, and the extension direction of the strip holes may be parallel to the third direction Z.

[0310] In an embodiment where the first connecting portion 242 has a first extension area 2421, a clearance hole 2425A is provided at the crease between the first sub-connecting portion 2423 and the second sub-connecting portion 2424. The clearance hole 2425A is a plurality of strip holes spaced apart along the third direction Z. The extension direction of the strip holes can be parallel to the third direction Z. The crease between the first sub-connecting portion 2423 and the second sub-connecting portion 2424 passes through the geometric center of the clearance hole 2425A along the third direction Z. The second sub-connecting portion 2424 rotates around the first groove 2425 to attach to one side of the first sub-connecting portion 2423 in the second direction Y, thereby forming a first extension area 2421 between two adjacent clearance holes 2425A.

[0311] Understandably, when the second sub-connecting portion 2424 rotates around the first groove 2425, the first groove 2425 can release the internal stress generated between the first sub-connecting portion 2423 and the second sub-connecting portion 2424 due to the second sub-connecting portion 2424 being folded relative to the first sub-connecting portion 2423, reducing the risk of bulging at the connection between the first sub-connecting portion 2423 and the second sub-connecting portion 2424, thereby reducing the risk of a gap between the first sub-connecting portion 2423 and the second sub-connecting portion 2424 in the second direction Y, and further reducing the risk of poor forming of the hot-melt area when the first connecting portion 242 and the first insulating member 23 are hot-melted together.

[0312] In this embodiment, a first groove 2425 is provided at the crease between the first sub-connecting portion 2423 and the second sub-connecting portion 2424. On the one hand, this facilitates the second sub-connecting portion 2424 to fold along the first groove 2425 so as to be stacked with the first sub-connecting portion 2423 along the second direction Y. On the other hand, the first groove 2425 can be used to release the internal stress generated between the first sub-connecting portion 2423 and the second sub-connecting portion 2424 due to the folding of the second sub-connecting portion 2424 relative to the first sub-connecting portion 2423, thereby reducing the risk of bulging at the connection between the first sub-connecting portion 2423 and the second sub-connecting portion 2424 and improving the production qualification rate of the first connecting portion 242.

[0313] According to some embodiments of this application, please refer to Figure 11 The thickness of the first sub-connecting portion 2423, the thickness of the second sub-connecting portion 2424, and the thickness of the first main body portion 241 are all equal.

[0314] The thickness of the second sub-connecting portion 2424 refers to the distance between the opposite sides of the first main body portion 241 in the second direction Y when the first connecting portion 242 is connected to the first insulating member 23.

[0315] Understandably, when the first sub-connecting part 2423, the second sub-connecting part 2424, and the first main body part 241 are integrally formed by roll forming, the thicknesses of the first sub-connecting part 2423, the second sub-connecting part 2424, and the first main body part 241 are equal. On the one hand, this eliminates the need for the pressure roller device to have a stepped portion to roll the first sub-connecting part 2423, the second sub-connecting part 2424, and the first main body part 241 separately. On the other hand, since the thicknesses of the first sub-connecting part 2423, the second sub-connecting part 2424, and the first main body part 241 are equal, the first sub-connecting part 2423, the second sub-connecting part 2424, and the first main body part 241 can be arbitrarily cut into a specified shape from the roll-formed material without the need for precise positioning of the material. This allows the thicknesses of the areas occupied by the first sub-connecting part 2423, the second sub-connecting part 2424, and the first main body part 241 to differ, thereby reducing processing difficulty.

[0316] Understandably, when the first sub-connecting part 2423, the second sub-connecting part 2424, and the first main body part 241 are integrally formed by injection molding, the thickness of the first sub-connecting part 2423, the thickness of the second sub-connecting part 2424, and the thickness of the first main body part 241 are equal, which makes the opposite sides of the mold flat, facilitates the forming of the first sub-connecting part 2423, the second sub-connecting part 2424, and the first main body part 241, and reduces the processing difficulty of the first sub-connecting part 2423, the second sub-connecting part 2424, and the first main body part 241.

[0317] In this embodiment, the thicknesses of the first sub-connecting portion 2423, the second sub-connecting portion 2424, and the first main body portion 241 are equal, which reduces the complexity of the instruments used to manufacture the first sub-connecting portion 2423, the second sub-connecting portion 2424, and the first main body portion 241, improves the production qualification rate of the first sub-connecting portion 2423, the second sub-connecting portion 2424, and the first main body portion 241, and facilitates the processing of the first sub-connecting portion 2423, the second sub-connecting portion 2424, and the first main body portion 241.

[0318] According to some embodiments of this application, please refer to Figure 10 The first sub-connecting part 2423 and the second sub-connecting part 2424 are set separately.

[0319] In embodiments where the thickness of the first sub-connecting portion 2423 is equal to the thickness of the second sub-connecting portion 2424, the first sub-connecting portion 2423 and the second sub-connecting portion 2424 are separately provided. This allows the first sub-connecting portion 2423 and the second sub-connecting portion 2424 to be cut from raw materials of the same thickness. This enables the raw materials for the first sub-connecting portion 2423 and the second sub-connecting portion 2424 to be manufactured together, making the manufacturing of the raw materials simpler and thus facilitating the manufacturing of the first sub-connecting portion 2423 and the second sub-connecting portion 2424.

[0320] In embodiments where the thickness of the first sub-connecting portion 2423 and the thickness of the second sub-connecting portion 2424 are not equal, the first sub-connecting portion 2423 and the second sub-connecting portion 2424 are separately provided. The first sub-connecting portion 2423 and the second sub-connecting portion 2424 can be manufactured using raw materials of different thicknesses. This reduces the complexity of the instruments used to manufacture the first sub-connecting portion 2423, the second sub-connecting portion 2424 and the first main body portion 241, and facilitates the processing of the first sub-connecting portion 2423 and the second sub-connecting portion 2424, compared to embodiments where the first sub-connecting portion 2423 and the second sub-connecting portion 2424 are integrally formed.

[0321] In this embodiment, the first sub-connecting part 2423 and the second sub-connecting part 2424 are separately arranged and stacked along the second direction Y, which makes the structure simple and easy to implement.

[0322] According to some embodiments of this application, the second sub-connector 2424 and the first sub-connector 2423 are thermally fused together along the second direction Y.

[0323] In this embodiment, the second sub-connecting part 2424 and the first sub-connecting part 2423 are connected by heat fusion, which can effectively improve the connection strength and reliability between the second sub-connecting part 2424 and the first sub-connecting part 2423. This helps to reduce the risk of the second sub-connecting part 2424 and the first sub-connecting part 2423 falling off each other during use, thereby improving the strength of the first connecting part 242. Furthermore, there is no need to provide a component for connecting the second sub-connecting part 2424 and the first sub-connecting part 2423, which helps to optimize the production process and production cycle, and can reduce the manufacturing cost of the first connecting part 242.

[0324] According to some embodiments of this application, the second sub-connector 2424 and the first sub-connector 2423 are welded along the second direction Y.

[0325] The first sub-connecting portion 2423 and the second sub-connecting portion 2424 are welded together. That is, a portion of the first sub-connecting portion 2423 and a portion of the second sub-connecting portion 2424 are fused together and then fixedly connected. Alternatively, a portion of the first sub-connecting portion 2423, a portion of the second sub-connecting portion 2424, and welding material are fused together and then fixedly connected, so that a portion of the first sub-connecting portion 2423 and a portion of the second sub-connecting portion 2424 are fused into one unit. Exemplarily, the welding of the first sub-connecting portion 2423 and the second sub-connecting portion 2424 can be performed in various ways. For example, laser welding can be used to partially melt the first sub-connecting portion 2423 and the second sub-connecting portion 2424 to achieve welding between them. Ultrasonic welding can also be used to partially melt the first sub-connecting portion 2423 and the second sub-connecting portion 2424 to achieve welding between them.

[0326] In this embodiment, the second sub-connecting part 2424 and the first sub-connecting part 2423 are connected by welding, which can effectively improve the connection strength and reliability between the second sub-connecting part 2424 and the first sub-connecting part 2423. This helps to reduce the risk of the second sub-connecting part 2424 and the first sub-connecting part 2423 falling off each other during use, thereby improving the strength of the first connecting part 242. This also helps to optimize the production process and production cycle, and can reduce the manufacturing cost of the first connecting part 242.

[0327] According to some embodiments of this application, along the second direction Y, the second sub-connector 2424 is bonded to the first sub-connector 2423.

[0328] The second sub-connector 2424 is bonded to the first sub-connector 2423, that is, a portion of the first sub-connector 2423 and a portion of the second sub-connector 2424 are connected by an adhesive.

[0329] In this embodiment, the second sub-connecting part 2424 and the first sub-connecting part 2423 are connected by adhesive bonding, which can effectively improve the connection firmness and reliability between the second sub-connecting part 2424 and the first sub-connecting part 2423. This helps to reduce the risk of the second sub-connecting part 2424 and the first sub-connecting part 2423 falling off each other during use, further improves the binding force between the second sub-connecting part 2424 and the first sub-connecting part 2423, reduces the risk of the first connecting part 242 wrinkling, thereby improving the strength of the first connecting part 242. This is beneficial for optimizing the production process and production cycle, and can also reduce the manufacturing cost of the first connecting part 242.

[0330] According to some embodiments of this application, please refer to Figure 14 , Figure 14 This is a schematic diagram of the structure of the second insulating member 24 provided in some embodiments of this application when it does not cover the first surface 22A and the second surface 22B. The electrode assembly 22 has a second surface 22B, which is disposed opposite to the first surface 22A along the second direction Y. The second insulating member 24 also includes a second main body portion 243 and a second connecting portion 244. The second main body portion 243 at least partially covers the second surface 22B, and the second connecting portion 244 is connected to one end of the second main body portion 243 near the first wall 211. The second connecting portion 244 is connected to the first insulating member 23. The thickness of the second connecting portion 244 is greater than the thickness of the second main body portion 243.

[0331] The second surface 22B refers to an outer surface of the electrode assembly 22 in the second direction Y. In an embodiment where the electrode assembly 22 consists of multiple electrode sheets stacked along the second direction Y, the second surface 22B refers to the surface of the electrode sheet furthest from the first surface 22A in the second direction Y.

[0332] The second main body 243 is the portion of the second insulating member 24 used to at least cover the second surface 22B.

[0333] Reference Figure 14 The second main body 243, which is the portion of the second insulating member 24 used to at least cover the second surface 22B, can be understood as a portion of the second main body 243 covering the second surface 22B. The electrode assembly 22 has a third surface 22C and a fourth surface 22D disposed opposite to each other in the third direction Z. The third surface 22C and the fourth surface 22D are disposed adjacent to the second surface 22B. A portion of the second main body 243 can extend beyond both sides of the second surface 22B in the third direction Z and fold towards the third surface 22C and the fourth surface 22D respectively to cover part or completely cover the third surface 22C and the fourth surface 22D. The electrode assembly 22 has a fifth surface 22E in the first direction X, away from the first wall 211. The fifth surface 22E is disposed adjacent to the second surface 22B. A portion of the second main body 243 can extend beyond the second surface 22B away from the first wall 211 in the first direction X and fold towards the fifth surface 22E respectively to cover part or completely cover the fifth surface 22E.

[0334] The second connecting part 244 is the part of the second insulating member 24 that is connected to the second main body part 243 and is used to connect to the first insulating member 23.

[0335] After the second body portion 243 covers the second surface 22B, along the first direction X, the second connecting portion 244 is located between the second body portion 243 and the first wall 211 and is connected to the first insulating member 23.

[0336] In some embodiments, the second connection portion 244 may be connected to the first insulating member 23 by welding, hot-melt connection, bonding or other connection methods.

[0337] In some embodiments, the second main body 243 and the second connecting part 244 are designed separately, and the second connecting part 244 can be connected to the second main body 243 by welding, hot melt connection, bonding or other connection methods.

[0338] In some embodiments, the second main body 243 and the second connecting part 244 are integrally formed, and the second main body 243 and the second connecting part 244 are formed into two regions with different thicknesses by injection molding or roll forming.

[0339] Within the same projection plane perpendicular to the second direction Y, the orthographic projections of the tab and the adapter plate fall into the overall projection of the second connecting portion 244. That is, when viewed along the second direction Y, the second connecting portion 244 shares at least a portion of the space with the tab and the adapter plate. This reduces the impact of the second connecting portion 244 on the main body 223 of the electrode assembly 22.

[0340] In this embodiment, the thickness of the second connecting portion 244 is greater than the thickness of the second main body portion 243. On the one hand, this makes the strength of the second connecting portion 244 higher than that of the second main body portion 243, thereby reducing the risk of breakage at the connection between the second connecting portion 244 and the first insulating member 23 due to the inertia of the electrode assembly 22 and the uneven stress on the second connecting portion 244 when the electrode assembly 22 enters the housing 21. On the other hand, the thickness of the second main body portion 243 is less than that of the second connecting portion 244, reducing the space occupied by the second main body portion 243 within the housing 21. Thus, with a fixed space within the housing 21, the electrode assembly 22 can occupy more space, thereby increasing the volume of the electrode assembly 22 and increasing the energy density of the battery cell 20.

[0341] According to some embodiments of this application, the thickness of the second main body portion 243 is equal to the thickness of the first main body portion 241.

[0342] The thickness of the second main body 243 refers to the distance between the two sides of the second main body 243 along the second direction Y after the second connecting part 244 is connected to the first insulating member 23.

[0343] The first main body 241 and the second main body 243 can be made from raw materials of the same thickness, so that the raw materials of the first main body 241 and the second main body 243 can be manufactured together, making the manufacturing of raw materials simpler, and thus facilitating the manufacturing of the first sub-connecting part 2423 and the second sub-connecting part 2424.

[0344] In this embodiment, the thickness of the second main body 243 is equal to the thickness of the first main body 241, so that the thickness of the raw materials of the first main body 241 and the second main body 243 is the same, thereby enabling the first main body 241 and the second main body 243 to be produced using raw materials of the same thickness. This allows the raw materials of the first main body 241 and the second main body 243 to be manufactured together, which facilitates the production of the second insulating member 24.

[0345] According to some embodiments of this application, please refer to Figure 14 and Figure 15 , Figure 15 This is a schematic diagram of the unfolded structure of the second insulating member 24 provided in some embodiments of this application. The electrode assembly 22 has a third surface 22C and a fourth surface 22D disposed opposite each other along a third direction Z, with the first direction X, the second direction Y, and the third direction Z being perpendicular to each other; the second insulating member 24 also includes a third main body portion 245 and a fourth main body portion 246, which are respectively connected to the two ends of the first main body portion 241 along the third direction Z; the third main body portion 245 at least partially covers the third surface 22C, and in the first direction X, the end of the third main body portion 245 near the first wall 211 is connected to the first insulating member 23; the fourth main body portion 246 at least partially covers the fourth surface 22D, and in the first direction X, the end of the fourth main body portion 246 near the first wall 211 is connected to the first insulating member 23.

[0346] The third surface 22C refers to an outer surface of the electrode assembly 22 in the third direction Z.

[0347] The fourth surface 22D refers to a surface of the electrode assembly 22 that is disposed opposite to the third surface 22C in the third direction Z.

[0348] The first direction X can be parallel to the height direction of the battery cell 20, the second direction Y can be parallel to the width direction of the battery cell 20, and the third direction Z can be parallel to the length direction of the electrode assembly 22.

[0349] The third main body 245 is the portion or the entire portion of the second insulating member 24 that covers the third surface 22C, and the fourth main body 246 is the portion or the entire portion of the second insulating member 24 that covers the fourth surface 22D.

[0350] In some embodiments, the third main body 245, the fourth main body 246 and the first main body 241 are designed separately, and the third main body 245 and the fourth main body 246 can be connected to the first main body 241 by welding, hot-melt connection, bonding or other connection methods.

[0351] In some embodiments, the third main body portion 245, the fourth main body portion 246, and the first main body portion 241 are integrally formed, and the third main body portion 245, the fourth main body portion 246, and the first main body portion 241 are formed by injection molding or roll forming.

[0352] In this embodiment, the third surface 22C is at least partially covered by the third main body portion 245, and the fourth surface 22D is at least partially covered by the fourth main body portion 246, so as to insulate and isolate the third surface 22C, the fourth surface 22D and the outer casing 21, thereby reducing the risk of short circuit between the electrode assembly 22 and the outer casing 21, and thus improving the reliability of the battery cell 20. At the same time, the end of the third main body portion 245 near the first wall 211 is connected to the first insulating member 23, and the end of the fourth main body portion 246 near the first wall 211 is connected to the first insulating member 23, thereby increasing the area of ​​connection between the second insulating member 24 and the first insulating member 23, thereby improving the reliability of the connection between the second insulating member 24 and the first insulating member 23.

[0353] According to some embodiments of this application, please refer to Figure 14 and Figure 15 The thickness of the third main body 245 and the thickness of the fourth main body 246 are both equal to the thickness of the first main body 241.

[0354] The thickness of the third main body 245 refers to the distance between two opposite sides of the third main body 245 in the third direction Z when the third main body 245 is connected to the first insulating member 23.

[0355] The thickness of the fourth main body 246 refers to the distance between two opposite sides of the fourth main body 246 in the third direction Z when the fourth main body 246 is connected to the first insulating member 23.

[0356] Understandably, when the third main body 245, the fourth main body 246, and the first main body 241 are integrally formed by roll forming, the thicknesses of the third main body 245, the fourth main body 246, and the first main body 241 are equal. On the one hand, this eliminates the need for the roll forming device to have stepped sections to roll the third main body 245, the fourth main body 246, and the first main body 241 separately. On the other hand, since the thicknesses of the third main body 245, the fourth main body 246, and the first main body 241 are equal, the roll-formed material can be arbitrarily cut into a specified shape without the need for precise positioning of the material. This results in the thicknesses of the areas occupied by the third main body 245, the fourth main body 246, and the first main body 241 being different from the thicknesses of the areas occupied by the first main body 241, thereby reducing processing difficulty.

[0357] Understandably, when the third main body 245, the fourth main body 246, and the first main body 241 are integrally formed by injection molding, the thickness of the third main body 245, the thickness of the fourth main body 246, and the thickness of the first main body 241 are equal, which makes the opposite sides of the mold flat, facilitating the forming of the third main body 245, the fourth main body 246, and the first main body 241, and reducing the processing difficulty of the third main body 245, the fourth main body 246, and the first main body 241.

[0358] In some embodiments, a second groove 2451 is provided at the crease between the third main body portion 245 and the first main body portion 241. The second groove 2451 is a groove extending along the first direction X. Alternatively, the second groove 2451 can be a plurality of strip holes spaced apart along the first direction X. The extending direction of the strip holes can be parallel to the first direction X.

[0359] In some embodiments, a third groove 2461 is provided at the crease between the fourth main body portion 246 and the first main body portion 241. The third groove 2461 is a groove extending along the first direction X. Alternatively, the third groove 2461 can be a plurality of strip holes spaced apart along the first direction X. The extending direction of the strip holes can be parallel to the first direction X.

[0360] In this embodiment, the thickness of the third main body 245 and the thickness of the fourth main body 246 are equal to the thickness of the first main body 241, which reduces the complexity of the instruments used to manufacture the third main body 245, the fourth main body 246 and the first main body 241, improves the production qualification rate of the third main body 245, the fourth main body 246 and the first main body 241, and facilitates the processing of the third main body 245, the fourth main body 246 and the first main body 241.

[0361] According to some embodiments of this application, please refer to Figure 14 and Figure 15 The second insulating member 24 also includes a fifth main body portion 247 and a sixth main body portion 248, which are respectively connected to the two ends of the second main body portion 243 along the third direction Z; the fifth main body portion 247 at least partially covers the third surface 22C, and the end of the fifth main body portion 247 near the first wall 211 is connected to the first insulating member 23; the sixth main body portion 248 at least partially covers the fourth surface 22D, and the end of the sixth main body portion 248 near the first wall 211 is connected to the first insulating member 23.

[0362] The fifth main body 247 is the portion or the entire portion of the second insulating member 24 that covers the third surface 22C, and the sixth main body 248 is the portion or the entire portion of the second insulating member 24 that covers the fourth surface 22D.

[0363] For clarity, please refer to the diagram of the fifth main body section 247 and the second main body section 243. Figure 15 The area of ​​the fifth main body 247 and the second main body 243 is marked by dashed lines in the figure. It should be noted that the dashed lines are only for the purpose of showing the area of ​​the fifth main body 247 and the second main body 243 and do not represent any entity.

[0364] In some embodiments, the fifth main body portion 247, the sixth main body portion 248, and the second main body portion 243 are designed separately, and the fifth main body portion 247 and the sixth main body portion 248 can be connected to the second main body portion 243 by welding, hot-melt connection, bonding, or other connection methods.

[0365] In some embodiments, the fifth main body portion 247, the sixth main body portion 248, and the second main body portion 243 are integrally formed, and the fifth main body portion 247, the sixth main body portion 248, and the second main body portion 243 are formed by injection molding or roll forming.

[0366] In this embodiment, the third surface 22C is at least partially covered by the fifth main body portion 247, and the fourth surface 22D is at least partially covered by the sixth main body portion 248, so as to insulate and isolate the third surface 22C, the fourth surface 22D and the outer casing 21, thereby reducing the risk of short circuit between the electrode assembly 22 and the outer casing 21, and thus improving the reliability of the battery cell 20. At the same time, the end of the fifth main body portion 247 near the first wall 211 is connected to the first insulating member 23, and the end of the sixth main body portion 248 near the first wall 211 is connected to the first insulating member 23, thereby increasing the area of ​​connection between the second insulating member 24 and the first insulating member 23, thereby improving the reliability of the connection between the second insulating member 24 and the first insulating member 23.

[0367] According to some embodiments of this application, please refer to Figure 14 and Figure 15 The thickness of the fifth main body 247 and the thickness of the sixth main body 248 are both equal to the thickness of the second main body 243.

[0368] The thickness of the fifth main body 247 refers to the distance between two opposite sides of the fifth main body 247 in the third direction Z when the fifth main body 247 is connected to the first insulating member 23.

[0369] The thickness of the sixth main body 248 refers to the distance between two opposite sides of the sixth main body 248 in the third direction Z when the sixth main body 248 is connected to the first insulating member 23.

[0370] Understandably, when the fifth main body portion 247, the sixth main body portion 248, and the second main body portion 243 are integrally formed by roll forming, the thicknesses of the fifth main body portion 247, the sixth main body portion 248, and the second main body portion 243 are equal. On the one hand, this eliminates the need for the pressure roller device to have stepped sections to roll the fifth main body portion 247, the sixth main body portion 248, and the second main body portion 243 separately. On the other hand, since the thicknesses of the fifth main body portion 247, the sixth main body portion 248, and the second main body portion 243 are equal, the material after roll forming can be arbitrarily cut into a specified shape without the need for precise positioning of the material. This allows the thicknesses of the areas occupied by the fifth main body portion 247, the sixth main body portion 248, and the second main body portion 243 to differ, thereby reducing processing difficulty.

[0371] Understandably, when the fifth main body part 247, the sixth main body part 248, and the second main body part 243 are integrally formed by injection molding, the thickness of the fifth main body part 247, the thickness of the sixth main body part 248, and the thickness of the second main body part 243 are equal, which makes the opposite sides of the mold flat, facilitating the forming of the fifth main body part 247, the sixth main body part 248, and the second main body part 243, and reducing the processing difficulty of the fifth main body part 247, the sixth main body part 248, and the second main body part 243.

[0372] In some embodiments, a fourth groove 2471 is provided at the crease between the fifth main body portion 247 and the second main body portion 243. The fourth groove 2471 is a groove extending along the first direction X. Alternatively, the fourth groove 2471 can be a plurality of strip holes spaced apart along the first direction X. The extending direction of the strip holes can be parallel to the first direction X.

[0373] In some embodiments, a fifth groove 2481 is provided at the crease between the sixth main body portion 248 and the second main body portion 243. The fifth groove 2481 is a groove extending along the first direction X. Alternatively, the fifth groove 2481 can be a plurality of strip holes spaced apart along the first direction X. The extending direction of the strip holes can be parallel to the first direction X.

[0374] In this embodiment, the thickness of the fifth main body portion 247 and the thickness of the sixth main body portion 248 are equal to the thickness of the second main body portion 243. This reduces the complexity of the instruments used to manufacture the fifth main body portion 247, the sixth main body portion 248 and the second main body portion 243, improves the production qualification rate of the fifth main body portion 247, the sixth main body portion 248 and the second main body portion 243, and facilitates the processing of the fifth main body portion 247, the sixth main body portion 248 and the second main body portion 243.

[0375] According to some embodiments of this application, please refer to Figure 14 and Figure 15 and refer to Figure 16 , Figure 16 This is a cross-sectional view of a second insulating member 24 covering a third surface 22C or a fourth surface 22D, as provided in some embodiments of this application. The third main body portion 245 and the fifth main body portion 247 at least partially overlap in the third direction Z, and the overlapping area of ​​the third main body portion 245 and the fifth main body portion 247 is connected to the first insulating member 23.

[0376] In this embodiment, the third main body portion 245 and the fifth main body portion 247 at least partially overlap in the third direction Z, so that the third main body portion 245 and the fifth main body portion 247 can cover the third surface 22C to insulate and isolate the third surface 22C and the housing 21, thereby reducing the risk of short circuit between the electrode assembly 22 and the housing 21; at the same time, the overlapping area of ​​the third main body portion 245 and the fifth main body portion 247 is connected to the first insulating member 23. Since the thickness of the overlapping area of ​​the third main body portion 245 and the fifth main body portion 247 is greater than the thickness of the third main body portion 245 or the thickness of the fifth main body portion 247, the strength of the connection between the overlapping area of ​​the third main body portion 245 and the fifth main body portion 247 and the first insulating member 23 is greater than the strength of the connection between the third main body portion 245 and the first insulating member 23 alone or the strength of the connection between the fifth main body portion 243 and the first insulating member 23 alone. This reduces the risk of breakage at the connection between the third main body 245 and the first insulating member 23 and the connection between the fifth main body 223 and the first insulating member 23 due to the inertia of the electrode assembly 22 and the uneven stress on the second insulating member 24 when the electrode assembly 22 enters the housing 21.

[0377] According to some embodiments of this application, please refer to Figure 14 and Figure 15 and refer to Figure 16 The fourth main body portion 246 and the sixth main body portion 248 overlap at least partially in the third direction Z, and the overlapping area of ​​the fourth main body portion 246 and the sixth main body portion 248 is connected to the first insulating member 23.

[0378] In this embodiment, the fourth main body portion 246 and the sixth main body portion 248 at least partially overlap in the third direction Z, so that the fourth main body portion 246 and the sixth main body portion 248 can cover the fourth surface 22D to insulate and isolate the fourth surface 22D and the housing 21, thereby reducing the risk of short circuit between the electrode assembly 22 and the housing 21; at the same time, the overlapping area of ​​the fourth main body portion 246 and the sixth main body portion 248 is connected to the first insulating member 23. Since the thickness of the overlapping area of ​​the fourth main body portion 246 and the sixth main body portion 248 is greater than the thickness of the fourth main body portion 246 or the thickness of the sixth main body portion 248, the strength of the connection between the overlapping area of ​​the fourth main body portion 246 and the sixth main body portion 248 and the first insulating member 23 is greater than the strength of the connection between the fourth main body portion 246 and the first insulating member 23 alone or the strength of the connection between the sixth main body portion 243 and the first insulating member 23. This reduces the risk of breakage at the connection between the fourth main body 246 and the first insulating member 23 and the connection between the sixth main body 223 and the first insulating member 23 due to the inertia of the electrode assembly 22 and the uneven stress on the second insulating member 24 when the electrode assembly 22 enters the housing 21.

[0379] According to some embodiments of this application, please refer to Figure 14 and Figure 15 Along the first direction X, the electrode assembly 22 has a fifth surface 22E facing away from the first wall 211; the second insulating member 24 also includes a seventh body portion 249, which at least partially covers the fifth surface 22E, and the seventh body portion 249 connects the first body portion 241 and the second body portion 243.

[0380] The fifth surface 22E refers to a surface of the electrode assembly 22 that is away from the first wall 211 in the first direction X.

[0381] The seventh main body 249 is the portion of the second insulating member 24 that covers the fifth surface 22E.

[0382] For a clearer view of the scope of the seventh main body section 249, please refer to... Figure 15 The area of ​​the seventh main body 249 is marked by a dashed line in the figure. It should be noted that the dashed line is only for the purpose of showing the area of ​​the seventh main body 249 and does not represent any entity.

[0383] In some embodiments, the first main body 241, the second main body 243, and the seventh main body 249 are designed separately, and the first main body 241 and the second main body 243 can be connected to the seventh main body 249 by welding, hot-melt connection, bonding, or other connection methods.

[0384] In some embodiments, the first main body portion 241, the second main body portion 243, and the seventh main body portion 249 are integrally formed, and the first main body portion 241, the second main body portion 243, and the seventh main body portion 249 are formed by injection molding or roll forming.

[0385] In some embodiments, a sixth groove 2491 is provided at the crease between the first main body portion 241 and the seventh main body portion 249. The sixth groove 2491 is a groove extending along the third direction Z. Alternatively, the sixth groove 2491 can be a plurality of strip holes spaced apart along the third direction Z. The extending direction of the strip holes can be parallel to the third direction Z.

[0386] In some embodiments, a seventh groove is provided at the crease between the second main body portion 243 and the seventh main body portion 249. The seventh groove 2492 is a groove extending along the third direction Z. Alternatively, the seventh groove 2492 can be a plurality of strip holes spaced apart along the third direction Z. The extending direction of the strip holes can be parallel to the third direction Z.

[0387] In this embodiment, the second insulating member 24 further includes a seventh main body portion 249, which at least partially covers the fifth surface 22E to insulate and isolate the fifth surface 22E from the housing 21, thereby reducing the risk of short circuit between the electrode assembly 22 and the housing 21; at the same time, the seventh main body portion 249 connects the first main body portion 241 and the second main body portion 243, thereby improving the integrity of the second insulating member 24 and facilitating the processing and manufacturing of the second insulating member 24.

[0388] According to some embodiments of this application, the electrode assembly 22 includes a positive electrode and a negative electrode. The electrode assembly 22 has a flat region, and the portions of the positive electrode and the negative electrode located in the flat region are stacked along the second direction Y.

[0389] The positive and negative electrode plates are flat in the flat region.

[0390] In an embodiment where the electrode assembly 22 has a stacked structure, both the positive and negative electrode sheets are flat and stacked along the second direction Y.

[0391] In an embodiment where the electrode assembly 22 has a wound structure, the electrode assembly 22 includes a straight region and two bent regions. The two bent regions are respectively connected to the two ends of the straight region in the third direction Z. The positive electrode and the negative electrode are straight in the straight region and bent in the bent region.

[0392] In this embodiment, the portion of the positive electrode sheet located in the flat region and the portion of the negative electrode sheet located in the flat region are stacked along the second direction Y, thereby making the first surface 22A planar, which reduces the bending of the first main body portion 241 and the first connecting portion 242, thus facilitating the connection between the first connecting portion 242 and the first insulating member 23.

[0393] According to some embodiments of this application, the capacity of the battery cell 20 is greater than 500Ah.

[0394] The capacity of the battery cell 20 can be any one of the following values: 500Ah, 510Ah, 520Ah, 530Ah, 540Ah, 550Ah, 560Ah, 570Ah, 580Ah, 590Ah, 600Ah, 700Ah, 800Ah, 900Ah, or a range between any two of these values, or a value or range greater than the above values.

[0395] In this embodiment, the larger the capacity of the battery cell 20, the greater the mass of the electrode assembly 22 of the battery cell 20, which in turn leads to a greater inertia when it enters the housing 21. Since the thickness of the first connecting part 242 is greater than the thickness of the first main body part 241, the strength of the connection between the second insulating member 24 and the first insulating member 23 is enhanced, reducing the risk of the connection between the first connecting part 242 and the first insulating member 23 breaking due to the greater inertia generated by the movement of the electrode assembly 22 when it enters the housing 21.

[0396] According to some embodiments of this application, please refer to Figure 17 , Figure 17 This is a schematic diagram of the structure of a battery cell 20 provided in some embodiments of this application. The dimension of the battery cell 20 in the first direction X is H1, the dimension of the battery cell 20 in the second direction Y is T1, and the dimension of the battery cell 20 in the third direction Z is W1, satisfying 3720cm. 3 ≤W1×T1×H1≤12500cm 3 The first direction X, the second direction Y, and the third direction Z are all perpendicular to each other.

[0397] The dimension of the battery cell 20 in the first direction X is the height of the battery cell 20 in the first direction X, which is the distance between the two sides of the battery cell 20 that are disposed opposite to each other in the first direction X.

[0398] The dimension of the battery cell 20 in the second direction Y is the width of the battery cell 20 in the second direction Y, which is the distance between the two sides of the battery cell 20 that are disposed opposite to each other in the second direction Y.

[0399] The dimension of the battery cell 20 in the third direction Z is the length of the battery cell 20 in the third direction Z, which is the distance between the two sides of the battery cell 20 that are set opposite to each other in the third direction Z.

[0400] W1×T1×H1 can be taken as 3720cm 3 3730cm 3 3740cm 3 3750cm 3 3760cm 3 3770cm 3 3780cm 3 3790cm 3 3800cm 3 3900cm 3 4000cm 3 5000cm 3 6000cm 3 7000cm 3 8000cm 3 9000cm 3 10000cm 3 11000cm 3 12000cm 3 12500cm 3 The point value of any one of them or the range value between any two.

[0401] In this embodiment, since the volume of the battery cell 20 is larger, the volume of the electrode assembly 22 of the battery cell 20 is also larger, resulting in a larger mass of the electrode assembly 22. Consequently, the inertia is greater when it enters the outer casing 21. Since the thickness of the first connecting part 242 is greater than the thickness of the first main body part 241, the strength of the connection between the second insulating member 24 and the first insulating member 23 is enhanced, reducing the risk of breakage at the connection between the first connecting part 242 and the first insulating member 23 due to the greater inertia generated by the movement of the electrode assembly 22 when it enters the outer casing 21.

[0402] According to some embodiments of this application, please refer to Figure 17 , 120mm≤H1≤400mm.

[0403] H1 can be any point value or a range between any two of the following: 120mm, 130mm, 140mm, 150mm, 160mm, 170mm, 180mm, 190mm, 200mm, 250mm, 300mm, 350mm, 400mm.

[0404] In this embodiment, since the battery cell 20 has a larger size in the first direction X, and its volume is larger when the size in other directions is constant, the volume of the electrode assembly 22 of the battery cell 20 is larger, which makes the mass of the electrode assembly 22 larger. This results in greater inertia when it enters the housing 21. Therefore, the thickness of the first connecting part 242 is set to be greater than the thickness of the first main body 241, so that the strength of the connection between the second insulating member 24 and the first insulating member 23 is strengthened, reducing the risk of breakage at the connection between the first connecting part 242 and the first insulating member 23 due to the greater inertia generated by the movement of the electrode assembly 22 when it enters the housing 21.

[0405] According to some embodiments of this application, please refer to Figure 17 , 60mm≤T1≤150mm.

[0406] T1 can be any point value or a range between any two of the following: 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm, 150mm.

[0407] In this embodiment, since the battery cell 20 has a larger size in the second direction Y, and its volume is larger when the size in other directions is constant, the volume of the electrode assembly 22 of the battery cell 20 is larger, which makes the mass of the electrode assembly 22 larger. This results in greater inertia when it enters the housing 21. Therefore, the thickness of the first connecting part 242 is set to be greater than the thickness of the first main body 241, so that the strength of the connection between the second insulating member 24 and the first insulating member 23 is strengthened, reducing the risk of breakage at the connection between the first connecting part 242 and the first insulating member 23 due to the greater inertia generated by the movement of the electrode assembly 22 when it enters the housing 21.

[0408] According to some embodiments of this application, please refer to Figure 17 , 200mm≤W1≤1500mm.

[0409] W1 can take any point value from 200mm, 210mm, 220mm, 230mm, 240mm, 250mm, 260mm, 270mm, 280mm, 290mm, 300mm, 400mm, 500mm, 600mm, 700mm, 800mm, 900mm, 1000mm, 1100mm, 1200mm, 1300mm, 1400mm, 1500mm, or a range between any two.

[0410] In this embodiment, since the battery cell 20 has a larger size in the third direction Z, and the battery cell 20 has a larger volume when the size in other directions is constant, the electrode assembly 22 of the battery cell 20 has a larger volume, which makes the electrode assembly 22 have a larger mass. As a result, it has a larger inertia when it enters the housing 21. Therefore, the thickness of the first connecting part 242 is set to be greater than the thickness of the first main body part 241, so that the strength of the connection between the second insulating member 24 and the first insulating member 23 is strengthened, and the risk of the connection between the first connecting part 242 and the first insulating member 23 breaking due to the large inertia generated by the movement of the electrode assembly 22 when it enters the housing 21 is reduced.

[0411] In some embodiments, the electrode assembly 22 has a mass greater than 5 kg.

[0412] The mass of the electrode assembly 22 can be any one of the following values: 5.1kg, 5.2kg, 5.3kg, 5.4kg, 5.5kg, 5.6kg, 5.7kg, 5.8kg, 5.9kg, 6kg, 6.1kg, 6.2kg, 6.3kg, 6.4kg, 6.5kg, 7kg, 7.5kg, 8kg, or any value between two of these values, or a value or range greater than the above values.

[0413] It should be noted that the mass of the electrode assembly 22 is the mass of the electrode assembly 22 when it is not immersed in the electrolyte. For example, when measuring the mass of the electrode assembly 22 in a battery cell that has been assembled, the electrode assembly 22 can be removed from the housing 21 and inserted into a centrifuge. After separating the electrode assembly 22 and the electrolyte by the centrifuge, the mass of the electrode assembly 22 can be measured.

[0414] In this embodiment, since the larger the mass of the electrode assembly 22, the greater its inertia when entering the housing 21, the thickness of the first connecting part 242 is set to be greater than the thickness of the first main body part 241. This strengthens the connection between the second insulating member 24 and the first insulating member 23, reducing the risk of breakage at the connection between the first connecting part 242 and the first insulating member 23 due to the large inertia generated by the movement of the electrode assembly 22 when it enters the housing 21.

[0415] According to some embodiments of this application, the outer casing 21 includes a housing and a cover plate, the housing having an opening and the cover plate sealing the opening; the first wall 211 is the cover plate, or the first wall 211 is a wall portion of the housing opposite to the cover plate.

[0416] The housing is a component used to house the electrode assembly 22.

[0417] The cover is a component that closes the opening of the housing to isolate the internal environment of the battery cell 20 from the external environment.

[0418] Understandably, the shape of the cover plate can be adapted to the shape of the shell. For example, if the shell is a cuboid structure, the cover plate can be a rectangular plate structure that fits the shell. The cover plate can also be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. The material of the cover plate can be the same as or different from that of the shell.

[0419] The first wall 211 can be a cover plate; or, the first wall 211 can also be a wall portion of the shell opposite to the cover plate, which is not limited in the embodiments of this application.

[0420] In this embodiment, the opening design facilitates the placement of the electrode assembly 22 within the housing, and the cover plate seals the opening to form a sealed space, thereby providing a stable working environment for the electrode assembly 22 and improving the reliability of the battery cell 20.

[0421] According to some embodiments of this application, a battery device 100 is also provided, which includes the battery cell 20 provided above.

[0422] Among them, reference Figure 2 As shown, the battery device 100 may also include a housing 10, in which the battery cells 20 are housed.

[0423] In some embodiments, the housing 10 may include a first housing body 11 and a second housing body 12, the first housing body 11 and the second housing body 12 covering each other, the first housing body 11 and the second housing body 12 together defining an assembly space for accommodating the battery cell 20.

[0424] Optionally, the second box body 12 can be a hollow structure with one end open, and the first box body 11 can be a plate-like structure. The first box body 11 covers the open side of the second box body 12 so that the first box body 11 and the second box body 12 together define the assembly space; the first box body 11 and the second box body 12 can also be hollow structures with one side open, and the open side of the first box body 11 covers the open side of the second box body 12.

[0425] Of course, the box 10 formed by the first box body 11 and the second box body 12 can be of various shapes, such as a cylinder or a cuboid. For example, see [reference]. Figure 2 Box 10 has a rectangular structure.

[0426] Optionally, the battery cell 20 disposed within the housing 10 can be one or more. For example, see [reference]. Figure 2The battery device 100 has multiple battery cells 20 installed inside its housing 10. These battery cells 20 can be connected in series, in parallel, or in a mixed configuration. A mixed configuration means that some of the battery cells 20 are connected in series and others in parallel. The multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 20 is housed inside the housing 10.

[0427] The battery device 100 may also include other structures. For example, the battery device 100 may also include a busbar component that connects multiple battery cells 20 to achieve electrical connection between the multiple battery cells 20.

[0428] It should be noted that in some embodiments, the battery device 100 may not have a housing 10. The battery device 100 includes multiple battery cells 20, and the battery device 100 composed of multiple battery cells 20 can be directly mounted onto the electrical device to provide power to the electrical device through the multiple battery cells 20. That is, the housing 10 can be part of the electrical device. Taking a vehicle 1000 as an example, the housing 10 can be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 10 can be at least a part of the floor of the vehicle 1000, or a portion of the housing 10 can be at least a part of the crossbeams and longitudinal beams of the vehicle 1000.

[0429] According to some embodiments of this application, some embodiments of this application also provide an electrical device, which includes a battery cell 20 as described above, the battery cell 20 being used to provide electrical energy.

[0430] According to some embodiments of this application, please refer to Figures 3-17 A battery cell 20 is provided, including a housing 21, an electrode assembly 22, a first insulating member 23, and a second insulating member 24. The housing 21 has a first wall 211 in a first direction X. The electrode assembly 22 is housed within the housing 21 and has a first surface 22A in a second direction Y, which is perpendicular to the first direction X. The first insulating member 23 is disposed between the first wall 211 and the electrode assembly 22. The second insulating member 24 at least partially encloses the electrode assembly 22 and includes a first main body 241 and a first connecting portion 242. The first main body 241 at least partially covers the first surface 22A. In the first direction X, the first connecting portion 242 is connected to one end of the first main body 241 near the first wall 211 and is connected to the first insulating member 23. The thickness of the first connecting portion 242 is greater than the thickness of the first main body 241.

[0431] The first connecting part 242 has a maximum width of B in the first direction X, satisfying 3.5mm≤B≤7mm; the first connecting part 242 has a thickness of A in the second direction Y, satisfying 0.2mm≤A≤0.45mm; the first connecting part 242 has a length of L in the third direction Z, satisfying 170mm≤L≤350mm; and the first direction X, the second direction Y, and the third direction Z are all perpendicular to each other.

[0432] The first connecting portion 242 includes a plurality of first extension regions 2421, which are spaced apart along the third direction Z. The first insulating member 23 includes a base 231 and a plurality of protrusions 232. Along the first direction X, the plurality of protrusions 232 protrude from the side of the base 231 facing the electrode assembly 22 and are spaced apart along the third direction Z. The plurality of first extension regions 2421 are connected to the plurality of protrusions 232 in a one-to-one correspondence.

[0433] The first connecting portion 242 also includes a first body region 2422. In the first direction X, the first body region 2422 is connected to the end of the first main body portion 241 near the first wall 211, and the first body region 2422 extends along the third direction Z. A plurality of first extension regions 2421 are connected to the first body region 2422 and protrude from the first body region 2422 along the first direction X.

[0434] The first extension region 2421 protrudes from the first body region 2422 by a dimension B1 in the first direction X, satisfying 3.5mm≤B1≤7mm; the first extension region 2421 has a dimension L1 in the third direction Z, satisfying 12mm≤L1≤20mm.

[0435] In some embodiments, the first connecting portion 242 includes a first sub-connecting portion 2423 and a second sub-connecting portion 2424, which are stacked along a second direction Y. The first sub-connecting portion 2423 is integrally formed with the first main body portion 241. The thickness of the first sub-connecting portion 2423 is equal to the thickness of the first main body portion 241, and the second sub-connecting portion 2424 is located between the first sub-connecting portion 2423 and the first insulating member 23.

[0436] In some embodiments, the first sub-connecting portion 2423 and the second sub-connecting portion 2424 are integrally formed, and along the first direction X, the end of the first sub-connecting portion 2423 away from the first connecting portion 242 is connected to the second sub-connecting portion 2424. A first groove 2425 is provided at the crease between the first sub-connecting portion 2423 and the second sub-connecting portion 2424.

[0437] In some embodiments, the first sub-connecting portion 2423 and the second sub-connecting portion 2424 are separately provided.

[0438] The thicknesses of the first sub-connecting portion 2423, the second sub-connecting portion 2424, and the first main body portion 241 are all equal.

[0439] In some embodiments, the second sub-connector 2424 and the first sub-connector 2423 are thermally fused together along the second direction Y. The first sub-connector 2423 and the second sub-connector 2424 are thermally fused together to form a first thermally fused region 2421D and a second thermally fused region 2422A, which are spaced apart along the third direction Z. At least a portion of the first thermally fused region 2421D is located in the first extension region 2421, and the second thermally fused region 2422A is located in the first body region 2422. The size of the first thermally fused region 2421D in the first direction X is larger than the size of the second thermally fused region 2422A in the first direction X. A portion of the first thermally fused region 2421D is located in the first extension region 2421, and another portion of the first thermally fused region 2421D is located in the first body region 2422.

[0440] In some embodiments, the second sub-connector 2424 and the first sub-connector 2423 are welded along the second direction Y.

[0441] In some embodiments, along the second direction Y, the second sub-connector 2424 is bonded to the first sub-connector 2423.

[0442] The electrode assembly 22 has a second surface 22B, which is disposed opposite to the first surface 22A along the second direction Y. The second insulating member 24 further includes a second main body portion 243 and a second connecting portion 244. The second main body portion 243 at least partially covers the second surface 22B, and the second connecting portion 244 is connected to one end of the second main body portion 243 near the first wall 211. The second connecting portion 244 is connected to the first insulating member 23. The thickness of the second connecting portion 244 is greater than the thickness of the second main body portion 243.

[0443] The electrode assembly 22 has a third surface 22C and a fourth surface 22D disposed opposite each other along a third direction Z, with the first direction X, the second direction Y, and the third direction Z being perpendicular to each other. The second insulating member 24 further includes a third main body portion 245 and a fourth main body portion 246, which are respectively connected to the two ends of the first main body portion 241 along the third direction Z. The third main body portion 245 at least partially covers the third surface 22C, and in the first direction X, the end of the third main body portion 245 near the first wall 211 is connected to the first insulating member 23. The fourth main body portion 246 at least partially covers the fourth surface 22D, and in the first direction X, the end of the fourth main body portion 246 near the first wall 211 is connected to the first insulating member 23. The thickness of the third main body portion 245 and the thickness of the fourth main body portion 246 are both equal to the thickness of the first main body portion 241.

[0444] The second insulating member 24 further includes a fifth main body portion 247 and a sixth main body portion 248, which are respectively connected to the two ends of the second main body portion 243 along the third direction Z. The fifth main body portion 247 at least partially covers the third surface 22C, and the end of the fifth main body portion 247 near the first wall 211 is connected to the first insulating member 23. The sixth main body portion 248 at least partially covers the fourth surface 22D, and the end of the sixth main body portion 248 near the first wall 211 is connected to the first insulating member 23. The thickness of the fifth main body portion 247 and the thickness of the sixth main body portion 248 are both equal to the thickness of the second main body portion 243.

[0445] The third main body portion 245 and the fifth main body portion 247 overlap at least partially in the third direction Z, and the overlapping area of ​​the third main body portion 245 and the fifth main body portion 247 is connected to the first insulating member 23.

[0446] The fourth main body portion 246 and the sixth main body portion 248 overlap at least partially in the third direction Z, and the overlapping area of ​​the fourth main body portion 246 and the sixth main body portion 248 is connected to the first insulating member 23.

[0447] Along the first direction X, the electrode assembly 22 has a fifth surface 22E facing away from the first wall 211; the second insulating member 24 also includes a seventh body portion 249, which at least partially covers the fifth surface 22E, and the seventh body portion 249 connects the first body portion 241 and the second body portion 243.

[0448] The electrode assembly 22 includes a positive electrode and a negative electrode. The electrode assembly 22 has a flat region. The portion of the positive electrode located in the flat region and the portion of the negative electrode located in the flat region are stacked along the second direction Y.

[0449] The capacity of the battery cell 20 is greater than 500Ah. The dimension of the battery cell 20 in the first direction X is H1, the dimension in the second direction Y is T1, and the dimension in the third direction Z is W1, satisfying 3720cm. 3 ≤W1×T1×H1≤12500cm 3 Where H1 satisfies 120mm≤H1≤400mm, T1 satisfies 60mm≤T1≤150mm, and W1 satisfies 200mm≤W1≤1500mm.

[0450] The outer casing 21 includes a shell and a cover plate. The shell has an opening, and the cover plate seals the opening. The first wall 211 is the cover plate, or the first wall 211 is a wall portion of the shell opposite to the cover plate.

[0451] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0452] The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit this application. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell, characterized in that, include: The outer casing has a first wall in a first direction; An electrode assembly is housed within the housing, the electrode assembly having a first surface in a second direction, the second direction being perpendicular to the first direction; A first insulating element is disposed between the first wall and the electrode assembly; A second insulating member at least partially encloses the electrode assembly. The second insulating member includes a first main body and a first connecting portion. The first main body at least partially covers the first surface. In the first direction, the first connecting portion is connected to one end of the first main body near the first wall. The first connecting portion is connected to the first insulating member. The thickness of the first connecting portion is greater than the thickness of the first main body portion.

2. The battery cell as described in claim 1, characterized in that, The maximum width of the first connecting part in the first direction is B, which satisfies 0 < B ≤ 10 mm.

3. The battery cell as described in claim 2, characterized in that, 3.5mm≤B≤7mm.

4. The battery cell as described in claim 1, characterized in that, The thickness of the first connecting part in the second direction is A, which satisfies 0.2mm≤A≤0.5mm.

5. The battery cell as described in claim 4, characterized in that, 0.2mm≤A≤0.45mm.

6. The battery cell as described in claim 1, characterized in that, The length of the first connecting part in the third direction is L, which satisfies 0 < L ≤ 350 mm, and the first direction, the second direction and the third direction are perpendicular to each other.

7. The battery cell as described in claim 6, characterized in that, 170mm≤L≤350mm.

8. The battery cell as described in claim 1, characterized in that, The first connecting portion includes a plurality of first extension areas, which are spaced apart along a third direction, with the first direction, the second direction, and the third direction being perpendicular to each other.

9. The battery cell as described in claim 8, characterized in that, The first insulating member includes a base and a plurality of protrusions. Along the first direction, the plurality of protrusions protrude from the side of the base facing the electrode assembly and are spaced apart along the third direction. The multiple first extension regions are connected one-to-one with the multiple protrusions.

10. The battery cell as described in claim 8, characterized in that, The first connecting portion further includes a first body area, which is connected to the end of the first main body portion near the first wall in the first direction, and the first body area extends along the third direction; Multiple first extension regions are connected to the first body region and protrude from the first body region along the first direction.

11. The battery cell as described in claim 10, characterized in that, The first connecting portion includes a first sub-connecting portion and a second sub-connecting portion, which are stacked along the second direction; The first sub-connecting part and the second sub-connecting part are thermally fused together to form a first thermal fusion zone and a second thermal fusion zone, and the first thermal fusion zone and the second thermal fusion zone are spaced apart along the third direction; At least a portion of the first hot melt zone is located in the first extension region, and the second hot melt zone is located in the first body region. The size of the first hot melt zone in the first direction is greater than the size of the second hot melt zone in the first direction.

12. The battery cell as described in claim 11, characterized in that, A portion of the first hot melt zone is located in the first extension zone, and another portion of the first hot melt zone is located in the first body zone.

13. The battery cell as described in claim 10, characterized in that, The first extension region protrudes from the first body region by a dimension B1 in the first direction, satisfying 0 < B1 ≤ 10 mm.

14. The battery cell as described in claim 13, characterized in that, 3.5mm≤B1≤7mm.

15. The battery cell as described in claim 8, characterized in that, The dimension of the first extension region in the third direction is L1, which satisfies 12mm≤L1≤25mm.

16. The battery cell as described in claim 15, characterized in that, 12mm≤L1≤20mm.

17. The battery cell as described in claim 1, characterized in that, The first connecting portion includes a first sub-connecting portion and a second sub-connecting portion, which are stacked along the second direction, and the first sub-connecting portion is integrally formed with the first main body portion.

18. The battery cell as described in claim 17, characterized in that, The thickness of the first sub-connector is equal to the thickness of the first main body.

19. The battery cell as described in claim 17, characterized in that, The second sub-connection is located between the first sub-connection and the first insulating member.

20. The battery cell as described in claim 17, characterized in that, The first sub-connecting part and the second sub-connecting part are integrally formed, and along the first direction, the end of the first sub-connecting part away from the first connecting part is connected to the second sub-connecting part.

21. The battery cell as described in claim 20, characterized in that, A first groove is provided at the crease between the first sub-connecting part and the second sub-connecting part.

22. The battery cell as described in claim 20, characterized in that, The thickness of the first sub-connecting part, the thickness of the second sub-connecting part, and the thickness of the first main body part are all equal.

23. The battery cell as described in claim 17, characterized in that, The first sub-connecting part and the second sub-connecting part are separately provided.

24. The battery cell according to any one of claims 17-23, characterized in that, Along the second direction, the second sub-connecting portion and the first sub-connecting portion are thermally fused together.

25. The battery cell according to any one of claims 17-23, characterized in that, Along the second direction, the second sub-connection portion and the first sub-connection portion are welded.

26. The battery cell according to any one of claims 17-23, characterized in that, Along the second direction, the second sub-connector is bonded to the first sub-connector.

27. The battery cell as described in claim 1, characterized in that, The electrode assembly has a second surface, which is disposed opposite to the first surface along the second direction; The second insulating member further includes a second main body portion and a second connecting portion. The second main body portion at least partially covers the second surface, and the second connecting portion is connected to one end of the second main body portion near the first wall. The second connecting portion is connected to the first insulating member. The thickness of the second connecting portion is greater than the thickness of the second main body portion.

28. The battery cell as described in claim 27, characterized in that, The thickness of the second main body is equal to the thickness of the first main body.

29. The battery cell as described in claim 27, characterized in that, The electrode assembly has a third surface and a fourth surface disposed opposite to each other along a third direction, wherein the first direction, the second direction and the third direction are perpendicular to each other; The second insulating member further includes a third main body portion and a fourth main body portion, wherein the third main body portion and the fourth main body portion are respectively connected to the two ends of the first main body portion along the third direction; The third main body portion at least partially covers the third surface, and in the first direction, one end of the third main body portion near the first wall is connected to the first insulating member; The fourth main body portion at least partially covers the fourth surface, and in the first direction, one end of the fourth main body portion near the first wall is connected to the first insulating member.

30. The battery cell as described in claim 29, characterized in that, The thickness of the third main body and the thickness of the fourth main body are both equal to the thickness of the first main body.

31. The battery cell as described in claim 29, characterized in that, The second insulating member further includes a fifth main body portion and a sixth main body portion, the fifth main body portion and the sixth main body portion being respectively connected to the two ends of the second main body portion along the third direction; The fifth main body portion at least partially covers the third surface, and one end of the fifth main body portion near the first wall is connected to the first insulating member; The sixth main body portion at least partially covers the fourth surface, and one end of the sixth main body portion near the first wall is connected to the first insulating member.

32. The battery cell as described in claim 31, characterized in that, The thickness of the fifth main body and the thickness of the sixth main body are both equal to the thickness of the second main body.

33. The battery cell as described in claim 31, characterized in that, The third main body portion and the fifth main body portion overlap at least partially in a third direction, and the overlapping area of ​​the third main body portion and the fifth main body portion is connected to the first insulating member.

34. The battery cell as described in claim 31, characterized in that, The fourth main body portion and the sixth main body portion overlap at least partially in a third direction, and the overlapping area of ​​the fourth main body portion and the sixth main body portion is connected to the first insulating member.

35. The battery cell according to any one of claims 27-34, characterized in that, Along the first direction, the electrode assembly has a fifth surface facing away from the first wall; The second insulating member further includes a seventh body portion, which at least partially covers the fifth surface, and the seventh body portion connects the first body portion and the second body portion.

36. The battery cell as described in claim 1, characterized in that, The electrode assembly includes a positive electrode and a negative electrode, and the electrode assembly has a flat region. The portion of the positive electrode located in the flat region and the portion of the negative electrode located in the flat region are stacked along the second direction.

37. The battery cell as described in claim 1, characterized in that, The capacity of the battery cell is greater than 500Ah.

38. The battery cell as described in claim 1, characterized in that, The dimension of the battery cell in the first direction is H1, the dimension of the battery cell in the second direction is T1, and the dimension of the battery cell in the third direction is W1, satisfying 3720cm. 3 ≤W1×T1×H1≤12500cm 3 The first direction, the second direction, and the third direction are perpendicular to each other.

39. The battery cell as described in claim 38, characterized in that, 120mm≤H1≤400mm.

40. The battery cell as described in claim 38, characterized in that, 60mm≤T1≤150mm.

41. The battery cell as described in claim 38, characterized in that, 200mm≤W1≤1500mm.

42. The battery cell as described in claim 1, characterized in that, The electrode assembly has a mass greater than 5 kg.

43. The battery cell as described in claim 1, characterized in that, The outer casing includes a housing and a cover plate, the housing having an opening and the cover plate sealing the opening; The first wall is the cover plate, or the first wall is the wall portion of the housing opposite to the cover plate.

44. A battery device, characterized in that, It includes multiple battery cells according to any one of claims 1-43.

45. An electrical appliance, characterized in that, Includes a battery cell according to any one of claims 1-43, the battery cell being used to provide electrical energy.

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