Battery monomer, battery device and electric device

Abstract

The utility model provides a battery monomer, a battery device and a power utilization device, and belongs to the technical field of batteries. The battery monomer comprises a shell, an electrode assembly and a supporting piece, the electrode assembly is contained in the shell, the electrode assembly is of a winding type structure, and the electrode assembly is provided with a winding center hole extending in the first direction. At least part of the supporting piece is arranged in the winding center hole, the supporting piece comprises a first supporting part, and the first supporting part extends in the first direction. The first supporting part is provided with a through hole, the through hole extends in the first direction and penetrates through the end faces of the two ends of the first supporting part, the first supporting part is further provided with a notch, and the notch penetrates through the peripheral face of the first supporting part and the hole wall face of the through hole, so that the supporting piece has the functions of being compressed and rebounded while supporting the hole wall face of the winding center hole. Therefore, the phenomenon that the electrode assembly collapses at the winding center hole in the using process can be relieved, and the risk that the internal pressure of the single battery is increased sharply in the using process can also be relieved.

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 of electric vehicles, play an irreplaceable and important role. With the vigorous promotion of new energy vehicles, the demand for power battery products is also increasing. Among them, battery devices typically include a casing and multiple battery cells housed within the casing.

[0003] In battery technology, a battery cell includes a casing and an electrode assembly housed within the casing. The tabs of the electrode assembly are electrically connected to the casing or electrode terminals disposed on the casing to realize the input or output of electrical energy of the battery cell. However, in the prior art, battery cells are prone to problems such as electrode assembly damage or casing connection failure during use, resulting in a short service life and low reliability of the battery cell. Utility Model Content

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

[0005] In a first aspect, embodiments of this application provide a battery cell, including a housing, an electrode assembly, and a support member; the electrode assembly is housed within the housing, the electrode assembly has a wound structure, the electrode assembly has a wound central hole, and the wound central hole extends along a first direction; at least a portion of the support member is disposed within the wound central hole, the support member includes a first support portion, the first support portion extends along the first direction; wherein, the first support portion is provided with a through hole, the through hole extends along the first direction and penetrates the end faces of both ends of the first support portion, the first support portion is also provided with a notch, the notch penetrates the outer peripheral surface of the first support portion and the hole wall surface of the through hole.

[0006] In the above technical solution, a support member is provided inside the winding center hole of the electrode assembly. The extension direction of the first support portion of the support member and the extension direction of the winding center hole are both along the first direction. This allows the support member to support the hole wall of the winding center hole of the electrode assembly, effectively mitigating the collapse of the electrode assembly at the winding center hole during use. This reduces the risk of lithium plating or even breakage and cracking of the electrode assembly during use, and also reduces the drop in battery cell capacity during use. Specifically, by providing through holes penetrating both ends of the first support portion along the first direction, and providing notches on the first support portion that penetrate the outer peripheral surface of the first support portion and the hole wall of the through holes, at least a portion of the first support portion has a "C"-shaped structure in a cross-section perpendicular to the first direction. This allows the through holes to connect the spaces at both ends of the electrode assembly in the first direction, which is beneficial for the internal structure of the planar battery cell. The pressure is reduced to decrease the risk of casing cracking due to excessive internal pressure in the battery cell, and it facilitates electrolyte passage, which is beneficial to improving the wetting effect of the electrode assembly. On the other hand, while supporting the hole wall of the winding center hole, the support also has the function of being compressed and rebounding. This reduces the rigid support of the support on the hole wall of the winding center hole, so that when the electrode assembly expands during use, it can compress the support, allowing the expansion of the electrode assembly to be effectively released at the winding center hole. Furthermore, when the electrode assembly contracts, the support can rebound to effectively support the hole wall of the winding center hole of the electrode assembly. In this way, it can effectively alleviate the phenomenon of a surge in internal pressure in the battery cell during use, reducing the risk of damage and cracking of the electrode assembly or deformation and connection failure of the casing. It can also alleviate the phenomenon of collapse of the electrode assembly at the winding center hole, which is beneficial to improving the service life and reliability of the battery cell.

[0007] In some embodiments, the notch extends through the end face of at least one end of the first support in the first direction.

[0008] In the above technical solution, by setting the notch as a structure that penetrates at least one end face of the first support in the first direction, on the one hand, the difficulty of setting the notch on the first support can be reduced, thereby reducing the manufacturing difficulty of the support member. On the other hand, the performance of the support member being compressed and rebounding can be improved, thereby further reducing the rigid support of the support member on the hole wall of the winding center hole. This allows the support member to be compressed when the electrode assembly expands during use, so that the expansion of the electrode assembly can be effectively released at the winding center hole. It also allows the support member to rebound when the electrode assembly contracts, thereby effectively supporting the hole wall of the winding center hole of the electrode assembly.

[0009] In some embodiments, the notch extends through the end faces of both ends of the first support portion in the first direction.

[0010] In the above technical solution, by setting the notch to be a structure that penetrates the end faces of both ends of the first support in the first direction, so that any position of the first support is a "C"-shaped structure in the cross-section perpendicular to the first direction, on the one hand, the difficulty of setting the notch on the first support can be further reduced, thereby further reducing the manufacturing difficulty of the support member. On the other hand, the performance of the support member in being compressed and rebounding can be further improved, thereby further reducing the rigid support of the support member on the hole wall of the winding center hole. This allows the support member to be compressed when the electrode assembly expands during use, so that the expansion of the electrode assembly can be effectively released at the winding center hole, and the support member can rebound when the electrode assembly contracts, thereby effectively supporting the hole wall of the winding center hole of the electrode assembly.

[0011] In some embodiments, the first support portion has a first end and a second end opposite each other in the circumferential direction of the through hole, and the notch is formed between the first end and the second end; wherein the minimum distance between the first end and the second end is L, satisfying 0.3mm≤L≤1.5mm.

[0012] In the above technical solution, the minimum distance between the first end and the second end of the first support in the circumferential direction of the through hole is 0.3mm to 1.5mm. On the one hand, setting the minimum distance between the first end and the second end to be greater than or equal to 0.3mm can increase the space size of the first support when the electrode assembly expands, so as to further reduce the rigid support of the support member on the hole wall of the winding center hole. This can further alleviate the phenomenon of a surge in internal pressure in the battery cell during use, and further reduce the risk of damage and cracking of the electrode assembly or deformation and connection failure of the shell. On the other hand, setting the minimum distance between the first end and the second end to be less than or equal to 1.5mm can improve the structural strength of the support member, which is conducive to improving the support effect of the support member on the hole wall of the winding center hole. This can further alleviate the phenomenon of collapse of the electrode assembly at the winding center hole during use, and further reduce the risk of lithium plating or even breakage and cracking of the electrode assembly during use. It can also further reduce the phenomenon of a drop in the capacity of the battery cell during use.

[0013] In some embodiments, the notch extends along the first direction.

[0014] In the above technical solution, by setting the notch to extend along the first direction and penetrate through both ends of the first support, on the one hand, the difficulty of setting the notch on the first support can be reduced, thereby reducing the manufacturing difficulty of the support. On the other hand, when the electrode assembly expands, the compression effect of the first support of the support can be improved, thereby reducing the rigid support of the support on the hole wall of the winding center hole, and making it easier for the first support of the support to rebound when the electrode assembly contracts.

[0015] In some embodiments, the wall thickness of the through hole is T, which satisfies 0.6mm≤T≤1.4mm.

[0016] In the above technical solution, on the one hand, by setting the wall thickness of the through hole of the first support part to be greater than or equal to 0.6mm, the structural strength of the first support part can be improved, thereby reducing the risk of cracking or damage to the first support part during compression, thus effectively improving the stability and reliability of the support component. On the other hand, by setting the wall thickness of the through hole of the first support part to be less than or equal to 1.4mm, the difficulty of the first support part of the support component being compressed when the electrode assembly expands can be reduced, thereby further reducing the rigid support of the support component on the hole wall surface of the winding center hole, thereby further alleviating the phenomenon of a surge in internal pressure in the battery cell during use, and further reducing the risk of damage and cracking of the electrode assembly or deformation and connection failure of the outer shell.

[0017] In some embodiments, the diameter of the through hole is D1, which satisfies 1.5mm≤D1≤5.5mm.

[0018] In the above technical solution, on the one hand, by setting the diameter of the through hole of the first support part to be greater than or equal to 1.5mm, the first support part can be easily compressed when the electrode assembly expands. This reduces the difficulty of compressing the first support part of the support while supporting the hole wall of the winding center hole. On the other hand, by setting the diameter of the through hole of the first support part to be less than or equal to 5.5mm, the support difficulty of the support can be reduced, and the phenomenon of limited size of the support and wall thickness of the through hole due to excessive space occupied by the through hole can be reduced. This can effectively improve the structural strength of the support and reduce the risk of cracking or damage to the first support part during compression, which is conducive to improving the stability and reliability of the support.

[0019] In some embodiments, the outer diameter of the first support portion is D2, and the diameter of the winding center hole is D3, satisfying that 0.79≤D2 / D3≤1.

[0020] In the above technical solution, the ratio of the outer diameter of the first support part to the diameter of the winding center hole is 0.79 to 1. On the one hand, setting the ratio of the outer diameter of the first support part to the diameter of the winding center hole to be greater than or equal to 0.79 can reduce the gap between the support and the hole wall of the winding center hole, thereby improving the support effect of the support on the hole wall of the winding center hole. This further alleviates the phenomenon of collapse of the electrode assembly at the winding center hole during use, thereby further reducing the risk of lithium plating or even breakage and cracking of the electrode assembly during use, and can further reduce the phenomenon of capacity drop of the battery cell during use. On the other hand, setting the ratio of the outer diameter of the first support part to the diameter of the winding center hole to be less than or equal to 1 makes it easier to assemble the support into the winding center hole, thereby reducing the assembly difficulty between the support and the electrode assembly. In addition, during the process of assembling the support into the winding center hole, it can effectively alleviate the scraping and wear phenomenon of the support on the electrode assembly, thereby improving the assembly quality of the battery cell.

[0021] In some embodiments, 3.5mm ≤ D2 ≤ 5.5mm.

[0022] In the above technical solution, by setting the outer diameter of the first support part of the support member to 3.5mm to 5.5mm, the support effect of the support member on the hole wall of the winding center hole is improved, while the assembly difficulty between the support member and the electrode assembly is further reduced and the assembly quality of the battery cell is further improved.

[0023] In some embodiments, the support member further includes a second support portion; the second support portion is disposed within the through hole, and the second support portion has a plurality of connecting ends, the plurality of connecting ends being arranged at intervals along the circumference of the through hole and all being connected to the hole wall surface of the through hole.

[0024] In the above technical solution, by setting a second support part inside the through hole of the first support part, and having multiple connecting ends of the second support part connected to the hole wall of the through hole, the second support part is a structure that is connected to the hole wall of the through hole at multiple positions in the circumferential direction of the through hole. This allows the second support part to support the hole wall of the through hole of the first support part, thereby improving the structural strength of the support member, reducing the risk of cracking or damage to the support member during compression, and improving the support effect of the support member on the hole wall of the winding center hole, thereby further mitigating the phenomenon of collapse of the electrode assembly at the winding center hole during use.

[0025] In some embodiments, the second support is configured to bend and deform when the first support is compressed, and to recover its deformation when the first support is reset.

[0026] In the above technical solution, by setting the second support part to be able to bend and deform when the first support part is compressed, and to recover its deformation when the first support part is reset, on the one hand, the second support part can not only support the first support part, but also reduce the obstruction of the first support part when the first support part is compressed, thereby reducing the rigid support of the support member on the hole wall of the winding center hole. This allows the support member to still be compressed when the electrode assembly expands during use, so that the expansion of the electrode assembly can be released at the winding center hole. On the other hand, after the first support part is compressed, the second support part can assist the first support part in recovering, which helps to reduce the risk of the first support part collapsing after being compressed.

[0027] In some embodiments, the second support portion includes a plurality of support ribs arranged circumferentially along the through hole, with one end of each of the plurality of support ribs connected together and the other end serving as the connecting end.

[0028] In the above technical solution, the second support part is provided with multiple support ribs arranged circumferentially along the through hole, and one end of the support rib is connected to other support ribs, and the other end is connected to the hole wall of the through hole, so as to realize that the second support part supports the hole wall of the through hole of the first support part. The structure is simple, easy to manufacture, and has a good support effect.

[0029] In some embodiments, in a projection plane perpendicular to the first direction, the orthographic projection of the central axis of the through hole lies within the orthographic projection of the connection area of ​​the plurality of support ribs.

[0030] In the above technical solution, by setting the orthographic projection of the central axis of the through hole in the projection plane perpendicular to the first direction to be located in the orthographic projection of the connection area of ​​the multiple support ribs in the projection plane perpendicular to the first direction, the connection position of the multiple support ribs is located on the central axis of the through hole, thereby further improving the support effect of the second support part on the hole wall of the through hole of the first support part.

[0031] In some embodiments, in a projection plane perpendicular to the first direction, the width of the orthographic projection of the support rib is W, satisfying 0.15mm≤W≤0.35mm.

[0032] In the above technical solution, on the one hand, by setting the width of the orthographic projection of the support rib in the projection plane perpendicular to the first direction to be greater than or equal to 0.15mm, the structural strength of the support rib can be improved, thereby reducing the risk of breakage or damage during use, which is beneficial to improving the stability and reliability of the second support part. On the other hand, by setting the width of the orthographic projection of the support rib in the projection plane perpendicular to the first direction to be less than or equal to 0.35mm, the manufacturing difficulty of the support rib and the difficulty of setting it in the through hole can be reduced, and the phenomenon that the support rib supports the hole wall of the through hole of the first support part too much, causing the first support part to be unable to be effectively compressed can be alleviated.

[0033] In some embodiments, the second support portion includes at least one set of support ribs, each set of support ribs including two support ribs; wherein, in a projection plane perpendicular to the first direction, the length directions of the orthographic projections of the two support ribs in the same set are parallel.

[0034] In the above technical solution, by setting the orthographic projections of the two support ribs in the same group in a projection plane perpendicular to the first direction to be parallel to each other, the angle between the two support ribs in the same group in the circumferential direction of the through hole is 180 degrees, so that the two support ribs in the same group are connected at one end and respectively set opposite to each other. The second support part with this structure can improve the support effect of the second support part on the hole wall of the through hole of the first support part, thereby further reducing the risk of cracking or damage of the support member during compression, and further improving the support effect of the support member on the hole wall of the winding center hole, so as to further alleviate the phenomenon of collapse of the electrode assembly at the winding center hole during use.

[0035] In some embodiments, along the circumference of the through hole, the extension directions of the orthographic projections of each two adjacent support ribs in a projection plane perpendicular to the first direction are perpendicular to each other.

[0036] In the above technical solution, by setting the orthographic projections of two adjacent support ribs in the circumferential direction of the through hole in a projection plane perpendicular to the first direction to be mutually perpendicular, the thickness directions of the two adjacent support ribs in the circumferential direction of the through hole are perpendicular to each other, so as to reduce the connection difficulty between multiple support ribs and further improve the support effect of the support ribs of the second support part on the hole wall of the through hole.

[0037] In some embodiments, the supporting rib is a plate-like structure extending along the first direction.

[0038] In the above technical solution, by setting the support ribs as plate-like structures extending along the first direction, the manufacturing difficulty of the second support part can be reduced, and the connection difficulty of multiple support ribs can be reduced. On the other hand, the support ribs can support the hole wall of the through hole at multiple positions in the first direction, which is beneficial to improving the support effect of the support ribs of the second support part on the hole wall of the through hole.

[0039] In some embodiments, the first support portion and the second support portion are integrally formed.

[0040] In the above technical solution, by setting the first support part and the second support part of the support member as an integrally formed structure, the connection stability and reliability between the first support part and the second support part can be improved, which helps to reduce the risk of the second support part detaching from the through hole during use.

[0041] In some embodiments, the elastic modulus of the material of the support member is E, which satisfies 800MPa≤E≤2000MPa.

[0042] In the above technical solution, by setting the elastic modulus of the support material to 800MPa to 2000MPa, on the one hand, it can alleviate the phenomenon that the support is too soft and therefore the support effect on the hole wall of the winding center hole is not good. It also facilitates the rebound of the first support part of the support when the electrode assembly shrinks, thereby further mitigating the risk of the electrode assembly collapsing at the winding center hole during use. On the other hand, it can alleviate the rigid support of the support on the hole wall of the winding center hole caused by the support being too hard, so that the support can be compressed when the electrode assembly expands during use, which helps to reduce the risk of a sharp increase in internal pressure in the battery cell during use.

[0043] In some embodiments, the electrode assembly includes a first electrode and a second electrode with opposite polarities, both of which are wound around the winding center hole; the first electrode includes a first current collector and a first active material layer, the first active material layer being disposed on at least one side of the first current collector in the radial direction of the winding center hole; the second electrode includes a second current collector and a second active material layer, the second active material layer being disposed on at least one side of the second current collector in the radial direction of the winding center hole; wherein, along the first direction, the second active material layer extends beyond both ends of the first active material layer, and the first support portion extends beyond both ends of the first active material layer.

[0044] In the above technical solution, by setting the first support part of the support member to extend beyond both ends of the first active material layer in the first direction, the support member can support the area where the first active material layer of the first electrode and the second active material layer of the second electrode are stacked, thereby effectively improving the support effect of the support member on the first electrode and the second electrode, further alleviating the phenomenon of collapse at the winding center hole of the electrode assembly during use, thereby further reducing the risk of lithium plating or even breakage and cracking of the electrode assembly during use, and further reducing the phenomenon of capacity drop of the battery cell during use.

[0045] In some embodiments, neither end of the first support portion in the first direction extends beyond the two ends of the second active material layer in the first direction.

[0046] In the above technical solution, by setting the two ends of the first support part of the support member in the first direction to not exceed the two ends of the second active material layer, the end of the support member is located between the end of the first active material layer and the end of the second active material layer in the first direction. This not only improves the support effect of the support member on the first electrode and the second electrode, but also effectively reduces the space occupied by the support member, thereby reducing the interference between the support member and other components inside the battery cell.

[0047] In some embodiments, the first electrode further includes a first tab connected to one end of the first current collector in the first direction, and the second electrode further includes a second tab connected to one end of the second current collector in the first direction; wherein, the first support extends beyond both ends of the second active material layer in the first direction along the first direction, and along the first direction, the first support does not extend beyond the end of the first tab away from the first current collector, and the first support does not extend beyond the end of the second tab away from the second current collector.

[0048] In the above technical solution, by setting the first support portion to extend beyond both ends of the second active material layer in the first direction, and not beyond the end of the first tab away from the first current collector and the end of the second tab away from the second current collector, the support member can also support the inner side of the first tab and the second tab near the winding center hole, thereby alleviating the phenomenon of the first tab and the second tab collapsing at the winding center hole, reducing the risk of the first tab or the second tab being inserted backward into the first active material layer or the second active material layer causing an internal short circuit in the battery cell, and thus improving the reliability of the battery cell.

[0049] In some embodiments, along the first direction, the first tab and the second tab are respectively formed at both ends of the electrode assembly; wherein, the two ends of the first support portion in the first direction do not extend beyond the end of the first tab away from the first current collector and the end of the first support portion does not extend beyond the end of the second tab away from the second current collector.

[0050] In the above technical solution, by setting the first tab and the second tab at the two ends of the electrode assembly in the first direction, so that the first support part does not exceed the structure of the first tab and the second tab at the two ends in the first direction, on the one hand, the separation between the first tab and the second tab can be achieved to reduce the risk of short circuit between the first tab and the second tab during use. On the other hand, the assembly difficulty between the support and the electrode assembly can be reduced to reduce the manufacturing difficulty of the battery cell, and the support can be used to support the first tab and the second tab respectively.

[0051] In some embodiments, the electrode assembly further includes a spacer disposed between the first electrode and the second electrode to separate the first electrode and the second electrode, wherein the spacer extends beyond both ends of the second active material layer along the first direction; wherein the first support extends beyond both ends of the second active material layer in the first direction, and neither end of the first support in the first direction extends beyond both ends of the spacer in the first direction.

[0052] In the above technical solution, an separator is also provided between the first electrode and the second electrode of the electrode assembly, so that the separator can separate the first electrode and the second electrode to reduce the risk of short circuit between the first electrode and the second electrode. In particular, by setting the first support portion to extend beyond the two ends of the second active material layer in the first direction but not beyond the two ends of the separator in the first direction, the support portion can also support the two ends of the separator in the first direction, so as to reduce the phenomenon that the separation effect of the first electrode and the second electrode is not good after the two ends of the separator collapse or wrinkle, thereby further reducing the risk of short circuit between the first electrode and the second electrode and improving the reliability of the battery cell.

[0053] In some embodiments, the electrode assembly is cylindrical, and the central axis of the electrode assembly extends along the first direction.

[0054] In the above technical solution, by setting the electrode assembly to a cylindrical shape, it is easier to process and form a cylindrical battery cell, which gives the battery cell advantages such as high capacity, long cycle life, and wide operating temperature range. Furthermore, by setting the central axis of the electrode assembly to a cylindrical structure extending along a first direction, it is easier to form a winding center hole extending along the first direction, thereby facilitating the assembly of the support member into the winding center hole and reducing the assembly difficulty of the battery cell.

[0055] Secondly, embodiments of this application also provide a battery device, including the aforementioned battery cell.

[0056] Thirdly, embodiments of this application also provide an electrical device, including the aforementioned battery cell, wherein the battery cell is used to provide electrical energy. Attached Figure Description

[0057] 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.

[0058] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0059] Figure 2 Exploded views of the structure of the battery device provided in some embodiments of this application;

[0060] Figure 3 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0061] Figure 4 Cross-sectional views of a battery cell provided in some embodiments of this application;

[0062] Figure 5 This is a schematic diagram of the structure of the support member provided in some embodiments of this application;

[0063] Figure 6 for Figure 5 A partial enlarged view of point A on the support member shown;

[0064] Figure 7 A cross-sectional view of the support member provided in some embodiments of this application, perpendicular to the first direction;

[0065] Figure 8 A cross-sectional view of an electrode assembly provided in some embodiments of this application, perpendicular to a first direction;

[0066] Figure 9This is an assembly diagram of the electrode assembly and support provided in some embodiments of this application.

[0067] Icons: 1000 - Vehicle; 100 - Battery assembly; 10 - Housing; 11 - First housing body; 12 - Second housing body; 20 - Battery cell; 21 - Casing; 211 - Shell; 2111 - Bottom wall; 2112 - Side wall; 212 - End cap; 22 - Electrode assembly; 221 - Winding center hole; 222 - First electrode; 2221 - First tab; 2222 - First current collector; 2223 - First active material layer; 223 - ... Diode; 2231-Second electrode tab; 2232-Second current collector; 2233-Second active material layer; 224-Isolator; 23-Support member; 231-First support part; 2311-Through hole; 2312-Notch; 2313-First end; 2314-Second end; 232-Second support part; 232a-Connecting end; 2321-Support rib; 24-Electrode terminal; 200-Controller; 300-Motor; X-First direction. Detailed Implementation

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] In this application, "multiple" means two or more (including two).

[0075] 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.

[0076] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0077] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, helps prevent short circuits to some extent while allowing active ions to pass through.

[0078] 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.

[0079] 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.

[0080] 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.).

[0081] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxide may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM) 622 LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811 ), lithium nickel cobalt aluminum oxide (such as LiNi) 0.85 Co 0.15 Al 0.05At least one of O2 and its modified compounds.

[0082] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloys, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, lithium source material, potassium metal, or sodium metal can also be filled and / or deposited within the foamed metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0083] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0084] 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, 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.).

[0085] 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.

[0086] 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.

[0087] 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.

[0088] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0089] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0090] In some embodiments, the separator is a separator membrane. The separator membrane can be of various types, and any known porous separator membrane with good chemical and mechanical stability can be selected.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] Among them, the gel electrolyte includes a polymer as the electrolyte backbone network, combined with an ionic liquid - lithium salt.

[0097] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0098] 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.

[0099] 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.

[0100] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0101] In some implementations, the electrode assembly has a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0102] In some implementations, the electrode assembly has a stacked structure.

[0103] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0104] 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.

[0105] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0106] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0107] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0108] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0109] 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.

[0110] 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.

[0111] As an example, a battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include, but are not limited to, square battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0112] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0113] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells into a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0114] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0115] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing by fixing the battery module in the housing.

[0116] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0117] As an example, the enclosure may include a first enclosure body and a second enclosure body. The first enclosure body and the second enclosure body are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, which can be either sealed or unsealed. The first enclosure body may be a top cover or a bottom plate.

[0118] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0119] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0120] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0121] Battery devices possess outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide applicability, and low self-discharge coefficient, making them an important component of today's new energy development. The development of battery technology must simultaneously consider multiple design factors, such as performance parameters like energy density, cycle life, discharge capacity, and charge / discharge rate. Furthermore, the reliability of the battery device must also be taken into account.

[0122] For a typical battery cell, it includes a casing and an electrode assembly housed within the casing. The electrode assembly includes two electrodes of opposite polarity and a spacer between them. To reduce manufacturing complexity, the spacer and the two electrodes are typically wound together to form a wound electrode assembly. A central hole is formed at the center of the electrode assembly. This central hole allows gas and electrolyte from inside the battery cell to pass through, facilitating internal venting and improving electrolyte wetting. It also provides a buffer for expansion during charging and discharging. However, because the wound electrode assembly has a hollow internal structure, the electrodes... During use, battery modules are highly susceptible to collapse at the winding center hole, especially in cylindrical battery cells. This can lead to risks such as lithium plating or even breakage and cracking of the electrode assembly. Therefore, in related technologies, a center pin is usually installed inside the winding center hole to support the hole wall of the electrode assembly, thereby reducing the risk of collapse at the center of the electrode assembly. However, in this type of battery cell, the center pin provides rigid support to the hole wall of the winding center hole. This prevents the expansion generated by the electrode assembly during use from being effectively released at the winding center hole, which can easily lead to increased internal pressure in the electrode assembly. This can cause damage and cracking of the electrode assembly, or deformation and connection failure of the casing, thus hindering the improvement of the battery cell's lifespan and reliability.

[0123] Based on the above considerations, in order to solve the problems of short service life and low reliability of battery cells, this application provides a battery cell including a housing, an electrode assembly, and a support member. The electrode assembly is housed within the housing and has a wound structure. The electrode assembly has a winding center hole that extends along a first direction. At least a portion of the support member is disposed within the winding center hole. The support member includes a first support portion that extends along the first direction. The first support portion has a through hole that extends along the first direction and penetrates the end faces of both ends of the first support portion. The first support portion also has a notch that penetrates the outer peripheral surface of the first support portion and the wall surface of the through hole.

[0124] In this type of battery cell, a support member is provided within the winding center hole of the electrode assembly. The extension direction of the first support portion of the support member and the extension direction of the winding center hole are both along the first direction. This allows the support member to support the hole wall of the winding center hole of the electrode assembly, effectively mitigating the collapse of the electrode assembly at the winding center hole during use. This reduces the risk of lithium plating or even breakage and cracking of the electrode assembly during use, and also reduces the drop in battery cell capacity during use. Specifically, by providing through holes penetrating both ends of the first support portion along the first direction, and providing notches on the first support portion that penetrate the outer peripheral surface of the first support portion and the hole wall of the through holes, at least a portion of the first support portion has a "C"-shaped structure in a cross-section perpendicular to the first direction. This allows the through holes to connect the spaces at both ends of the electrode assembly in the first direction, which is beneficial for planar battery cells. The internal pressure is reduced to minimize the risk of casing cracking due to excessive internal pressure in the battery cell, and facilitates electrolyte passage, which improves the wetting effect of the electrode assembly. On the other hand, while supporting the wall of the winding center hole, the support also has the function of being compressed and rebounding. This reduces the rigid support of the support on the wall of the winding center hole, allowing the support to be compressed when the electrode assembly expands during use, so that the expansion of the electrode assembly can be effectively released at the winding center hole. Furthermore, the support can rebound when the electrode assembly contracts, effectively supporting the wall of the winding center hole. This effectively alleviates the phenomenon of a surge in internal pressure in the battery cell during use, reducing the risk of damage and cracking of the electrode assembly or deformation and connection failure of the casing. It also prevents the collapse of the electrode assembly at the winding center hole, which is beneficial to improving the service life and reliability of the battery cell.

[0125] The battery cells disclosed in this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system for such an electrical device can be constructed using battery cells and battery devices disclosed in this application. This helps to mitigate the problem of damage or breakage of battery cells during use, thereby improving the service life and reliability of the battery cells.

[0126] This application provides an electrical device that uses a single battery cell or battery assembly as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0127] 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.

[0128] 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.

[0129] 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.

[0130] Please refer to Figure 2 and Figure 3 , Figure 2 This is an exploded view of the structure of the battery device 100 provided in some embodiments of this application. Figure 3 This is a schematic diagram of the structure of a battery cell 20 provided in some embodiments of this application. The battery device 100 includes a housing 10 and battery cells 20, which are housed within the housing 10.

[0131] 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.

[0132] 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.

[0133] In the battery device 100, there can be one or more battery cells 20 disposed within the housing 10. When there are multiple battery cells 20 disposed within the housing 10, they can be connected in series, in parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery device 100 can also consist of multiple battery cells 20 first connected in series, in parallel, or in a mixed configuration to form battery modules, and then multiple battery modules are connected in series, in parallel, or in a mixed configuration to form a whole, which is then housed within the housing 10.

[0134] 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.

[0135] Each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 20 can be in the form of a cuboid, cylinder, prism, or other shapes. For example, in... Figure 3 In the process, the battery cell 20 has a cylindrical structure, and the axial direction of the battery cell 20 is parallel to the first direction X.

[0136] According to some embodiments of this application, refer to Figure 3 Please refer to further details. Figure 4 , Figure 5 , Figure 6 and Figure 7 , Figure 4 This is a cross-sectional view of a battery cell 20 provided in some embodiments of this application. Figure 5 This is a schematic diagram of the structure of the support member 23 provided in some embodiments of this application. Figure 6 for Figure 5 A partial enlarged view of point A on the support member 23 shown. Figure 7This is a cross-sectional view of the support member 23 provided in some embodiments of this application, perpendicular to the first direction X. This application provides a battery cell 20, which includes a housing 21, an electrode assembly 22, and a support member 23. The electrode assembly 22 is housed within the housing 21 and has a wound structure. The electrode assembly 22 has a wound center hole 221, which extends along the first direction X. At least a portion of the support member 23 is disposed within the wound center hole 221. The support member 23 includes a first support portion 231, which extends along the first direction X. The first support portion 231 has a through hole 2311, which extends along the first direction X and penetrates the end faces of both ends of the first support portion 231. The first support portion 231 also has a notch 2312, which penetrates the outer peripheral surface of the first support portion 231 and the wall surface of the through hole 2311.

[0137] The outer shell 21 can also be used to contain electrolytes, such as electrolyte solution. The outer shell 21 can have various structural forms, such as a cylinder or a cuboid. Similarly, the outer shell 21 can be made of various materials, such as copper, iron, aluminum, steel, or aluminum alloy.

[0138] In some embodiments, the housing 21 can be a sealed structure or a non-sealed structure. As an example, when the housing 21 is a sealed structure, it can protect the electrode assembly 22 and prevent, to some extent, electrolyte leakage. When the housing 21 is a non-sealed structure, it can still protect the electrode assembly 22, and a sealing bag may be included between the housing 21 and the electrode assembly 22. The sealing bag is used to encapsulate the electrode assembly 22 and the electrolyte, etc. Specifically, the sealing bag can be a bag-shaped insulating component or an aluminum-plastic film.

[0139] Optionally, the housing 21 may include a housing 211 and an end cap 212. The housing 211 has an internal cavity for accommodating the electrode assembly 22 and has an opening. That is, the housing 211 is a hollow structure with an opening at one end. The end cap 212 covers the opening of the housing 211 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 22 and the electrolyte.

[0140] The housing 211 includes a bottom wall 2111 and a side wall 2112. The bottom wall 2111 and the end cap 212 are disposed opposite to each other. The side wall 2112 surrounds the bottom wall 2111, and one end of the side wall 2112 is connected to the bottom wall 2111, while the other end forms an opening.

[0141] When assembling the battery cell 20, the electrode assembly 22 can be placed into the housing 211 first, and the electrolyte can be filled into the housing 211. Then, the end cap 212 can be closed onto the opening of the housing 211 to complete the assembly of the battery cell 20.

[0142] The housing 211 can have various shapes, such as a cylinder, cuboid, or prism. The shape of the housing 211 can be determined based on the specific shape of the electrode assembly 22. For example, if the electrode assembly 22 is a cylinder, a cylindrical housing 211 can be used; if the electrode assembly 22 is a cuboid, a cuboid housing 211 can be used. Of course, the end cap 212 can also have various structures, such as a plate-like structure or a hollow structure open at one end. For example, in… Figure 3 In the middle, the shell 211 is a cylindrical structure, and the axis of the shell 211 is parallel to the first direction X. Correspondingly, the orthographic projection of the end cover 212 in the projection plane perpendicular to the first direction X is circular.

[0143] Of course, it is understandable that the outer casing 21 is not limited to the structure described above. The outer casing 21 can also be other structures. For example, the outer casing 21 can include a housing 211 and two end caps 212. The housing 211 is a hollow structure with openings on both opposite sides. One end cap 212 is fitted onto one opening of the housing 211 to form a sealed connection, thereby forming a sealed space for accommodating the electrode assembly 22 and the electrolyte. In other words, the housing 211 has openings on both opposite sides, and the two end caps 212 are fitted onto both sides of the housing 211 to close the corresponding openings.

[0144] In the embodiments of this application, please refer to Figure 8 and Figure 9 , Figure 8 This is a cross-sectional view of the electrode assembly 22 provided in some embodiments of this application, perpendicular to the first direction X. Figure 9 This is a schematic diagram illustrating the assembly of the electrode assembly 22 and the support member 23 provided in some embodiments of this application. The electrode assembly 22 may include a first electrode 222, a second electrode 223, and a spacer 224. The first electrode 222 and the second electrode 223 have opposite polarities. The spacer 224 is disposed between the first electrode 222 and the second electrode 223 to separate them. The electrode assembly 22 has a wound structure, meaning that the electrode assembly 22 is a wound structure formed by winding the first electrode 222, the second electrode 223, and the spacer 224.

[0145] The first electrode 222 and the second electrode 223 have opposite polarities, that is, the first electrode 222 and the second electrode 223 are the positive electrode and the negative electrode of the electrode assembly 22, respectively. Correspondingly, the first electrode 222 is provided with a first tab 2221, and the second electrode 223 is provided with a second tab 2231. The first tab 2221 and the second tab 2231 are the positive tab and the negative tab of the electrode assembly 22, respectively.

[0146] The electrode assembly 22 has a winding center hole 221, and the winding center hole 221 extends along the first direction X. That is, after the first electrode 222, the second electrode 223 and the separator 224 of the electrode assembly 22 are wound, a winding center hole 221 extending along the first direction X will be formed at the center position of the electrode assembly 22, and the winding center hole 221 is a structure that passes through both ends of the electrode assembly 22 along the first direction X.

[0147] For example, the electrode assembly 22 is cylindrical, and the central axis of the electrode assembly 22 extends along the first direction X.

[0148] For example, the separator 224 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.

[0149] In some embodiments, see Figure 3 and Figure 4 As shown, the battery cell 20 also includes an electrode terminal 24, which is insulated and mounted on the housing 21, and is electrically connected to one tab of the electrode assembly 22, so that the electrode terminal 24 serves as an output or input electrode of the battery cell 20.

[0150] The electrode terminal 24 is insulated and mounted on the housing 21, meaning that no electrical connection is formed between the electrode terminal 24 and the housing 21. For example, the electrode terminal 24 is insulated and mounted on the bottom wall 2111 of the housing 211.

[0151] Alternatively, the connection structure between the electrode terminal 24 and the tab can be varied, such as welding or abutment.

[0152] For example, the electrode terminal 24 can be made of various materials, such as copper, iron, aluminum, steel or aluminum alloy.

[0153] It should be noted that the other tab of the electrode assembly 22 can be electrically connected to the housing 21, so that the housing 21 serves as another output or input terminal of the battery cell 20, allowing the electrode terminal 24 and the housing 21 to cooperate in outputting or inputting electrical energy into the battery cell 20. Alternatively, in other embodiments, the battery cell 20 may include two electrode terminals 24, each disposed at one end of the housing 21 in the first direction X, and both electrode terminals 24 are insulated from the housing 21. The two electrode terminals 24 are electrically connected to the first tab 2221 and the second tab 2231 of the electrode assembly 22, respectively, so that the two electrode terminals 24 cooperate in inputting or outputting electrical energy into the battery cell 20.

[0154] In this embodiment, the support member 23 is a columnar structure extending along the first direction X, and at least a portion of the support member 23 is inserted into the winding center hole 221 of the electrode assembly 22 along the first direction X, such that the support member 23 is configured to support the hole wall of the winding center hole 221 during the use of the battery cell 20.

[0155] At least a portion of the support member 23 is disposed within the winding center hole 221. That is, the support member 23 can be a structure in which the entire structure is accommodated within the winding center hole 221 of the electrode assembly 22, or it can be a structure in which at least one end extends out of the winding center hole 221 of the electrode assembly 22.

[0156] The first support portion 231 is the main part of the support member 23 used to support the wall surface of the winding center hole 221. The first support portion 231 is a columnar structure extending along the first direction X. The first support portion 231 is provided with a through hole 2311. The through hole 2311 extends along the first direction X and penetrates the end faces of both ends of the first support portion 231. That is to say, the through hole 2311 extends along the first direction X and its two ends in the first direction X respectively extend to the end faces of both ends of the first support portion 231, making the first support portion 231 a hollow structure with an internal hollow structure and open at both ends.

[0157] The first support portion 231 is also provided with a notch 2312, which penetrates the outer peripheral surface of the first support portion 231 and the hole wall surface of the through hole 2311. That is to say, the notch 2312 penetrates the hole wall of the through hole 2311 radially.

[0158] It should be noted that the notch 2312 can be a structure that penetrates only one or both ends of the first support portion 231 in the first direction X, or it can be a structure in which neither end of the first support portion 231 in the first direction X is penetrated by the notch 2312, that is, the notch 2312 is formed between the end faces of the two ends of the first support portion 231 in the first direction X.

[0159] Optionally, the support member 23 can be made of various materials. It can be a metal, such as aluminum or steel, or a non-metallic material, such as polyethylene or polypropylene. In this embodiment, the support member 23 is made of a non-metallic material.

[0160] In some embodiments, the battery cell 20 may further include a pressure relief component for releasing the internal pressure of the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined value.

[0161] Optionally, the pressure relief component can be disposed on the end cap 212 of the outer casing 21 or on the housing 211 of the outer casing 21. Similarly, the pressure relief component and the outer casing 21 can be integrally formed or separately disposed. If the pressure relief component and the outer casing 21 are separately disposed, the pressure relief component can be connected to the outer casing 21 by welding or other means. Correspondingly, the pressure relief component can be a component such as an explosion-proof valve, explosion-proof disc, gas valve, pressure relief valve or safety valve. If the pressure relief component and the outer casing 21 are integrally formed, the pressure relief component is an area on the outer casing 21 with a weak structure, such as an area on the outer casing 21 with a groove.

[0162] In this embodiment, a support member 23 is provided inside the winding center hole 221 of the electrode assembly 22. The first support portion 231 of the support member 23 extends in the same direction as the winding center hole 221, both extending along the first direction X. This allows the support member 23 to support the hole wall of the winding center hole 221 of the electrode assembly 22, effectively mitigating the collapse of the electrode assembly 22 at the winding center hole 221 during use. This reduces the risk of lithium plating or even breakage and cracking of the electrode assembly 22 during use, and also reduces the risk of damage to the battery cells 20. The capacitance drop during use is mitigated by providing through holes 2311 extending along the first direction X through both ends of the first support 231, and providing notches 2312 on the first support 231, the notches 2312 penetrating the outer peripheral surface of the first support 231 and the wall surface of the through holes 2311. This results in at least a portion of the first support 231 having a "C"-shaped structure in a cross-section perpendicular to the first direction X. This allows the through holes 2311 to connect the spaces at both ends of the electrode assembly 22 along the first direction X. This design facilitates the reduction of internal pressure within the planar battery cell 20, thus minimizing the risk of the casing 21 cracking due to excessive internal pressure. It also allows for easier electrolyte passage, improving the wetting effect of the electrode assembly 22. Furthermore, while supporting the wall of the winding center hole 221, the support member 23 also possesses compression and rebound capabilities. This reduces the rigid support of the support member 23 on the hole wall of the winding center hole 221, allowing it to compress the support member 23 when the electrode assembly 22 expands during use, thereby reducing the expansion of the electrode assembly 22. The expansion can be effectively released at the winding center hole 221, and the support member 23 can rebound when the electrode assembly 22 contracts, so as to effectively support the hole wall of the winding center hole 221 of the electrode assembly 22. This can effectively alleviate the phenomenon of a surge in internal pressure in the battery cell 20 during use, thereby reducing the risk of damage and cracking of the electrode assembly 22 or deformation and connection failure of the outer shell 21. It can also alleviate the phenomenon of collapse of the electrode assembly 22 at the winding center hole 221, which is conducive to improving the service life and reliability of the battery cell 20.

[0163] According to some embodiments of this application, see Figure 5 , Figure 6 and Figure 7As shown, the notch 2312 penetrates at least one end face of the first support portion 231 in the first direction X. That is, the notch 2312 can be a structure that only penetrates one end face of the first support portion 231 in the first direction X, i.e., the notch 2312 extends to the end face of one end of the first support portion 231 in the first direction X, or it can be a structure that penetrates the end faces of both ends of the first support portion 231 in the first direction X, i.e., the notch 2312 extends to the end faces of both ends of the first support portion 231 in the first direction X.

[0164] In this embodiment, by setting the notch 2312 to penetrate at least one end face of the first support portion 231 in the first direction X, the difficulty of setting the notch 2312 on the first support portion 231 can be reduced, thereby reducing the manufacturing difficulty of the support member 23. On the other hand, the performance of the support member 23 in compression and rebound can be improved, thereby further reducing the rigid support of the support member 23 on the hole wall of the winding center hole 221. This allows the support member 23 to be compressed when the electrode assembly 22 expands during use, so that the expansion of the electrode assembly 22 can be effectively released at the winding center hole 221. It also allows the support member 23 to rebound when the electrode assembly 22 contracts, thereby effectively supporting the hole wall of the winding center hole 221 of the electrode assembly 22.

[0165] In some embodiments, please continue to see Figure 5 , Figure 6 and Figure 7 As shown, the notch 2312 penetrates the end faces of both ends of the first support portion 231 in the first direction X.

[0166] The notch 2312 penetrates the end faces of both ends of the first support portion 231 in the first direction X. That is, the notch 2312 is both a structure that penetrates the outer peripheral surface of the first support portion 231 and the wall surface of the through hole 2311, and a structure that penetrates the end faces of both ends of the first support portion 231 in the first direction X, so that the first support portion 231 has a first end 2313 and a second end 2314 in the circumferential direction of the through hole 2311, and the notch 2312 is formed between the first end 2313 and the second end 2314. The end face of the first end 2313 connects the outer peripheral surface of the first support portion 231 and the wall surface of the through hole 2311, and also connects the end faces of both ends of the first support portion 231 in the first direction X. Similarly, the end face of the second end 2314 connects the outer peripheral surface of the first support portion 231 and the wall surface of the through hole 2311, and also connects the end faces of both ends of the first support portion 231 in the first direction X.

[0167] For example, in Figure 5 and Figure 6In this context, the notch 2312 is a structure that extends along the first direction X and penetrates the end faces of both ends of the first support portion 231 in the first direction X. Of course, in other embodiments, the notch 2312 may also be a structure that extends spirally along the first direction X.

[0168] In this embodiment, by setting the notch 2312 to penetrate the end faces of both ends of the first support portion 231 in the first direction X, the shape of any position of the first support portion 231 is "C"-shaped in the cross-section perpendicular to the first direction X. On the one hand, this can further reduce the difficulty of setting the notch 2312 on the first support portion 231, thereby further reducing the manufacturing difficulty of the support member 23. On the other hand, it can further improve the compression and rebound performance of the support member 23, thereby further reducing the rigid support of the support member 23 on the hole wall of the winding center hole 221. This allows the support member 23 to be compressed when the electrode assembly 22 expands during use, so that the expansion of the electrode assembly 22 can be effectively released at the winding center hole 221. It also allows the support member 23 to rebound when the electrode assembly 22 contracts, thereby effectively supporting the hole wall of the winding center hole 221 of the electrode assembly 22.

[0169] According to some embodiments of this application, see Figure 6 and Figure 7 As shown, the first support portion 231 has a first end 2313 and a second end 2314 opposite each other in the circumferential direction of the through hole 2311, and a notch 2312 is formed between the first end 2313 and the second end 2314. The minimum distance between the first end 2313 and the second end 2314 is L, which satisfies 0.3mm≤L≤1.5mm.

[0170] Wherein, the first end 2313 and the second end 2314 are the two opposite ends of the first support part 231 where the notch 2312 is provided. Correspondingly, L is the minimum distance between the end face of the first end 2313 and the end face of the second end 2314 of the first support part 231. The end face of the first end 2313 of the first support part 231 connects the hole wall of the through hole 2311 and the outer peripheral surface of the first support part 231, and also connects the end faces of the two ends of the first support part 231 in the first direction X. Similarly, the end face of the second end 2314 of the first support part 231 connects the hole wall of the through hole 2311 and the outer peripheral surface of the first support part 231, and also connects the end faces of the two ends of the first support part 231 in the first direction X, so that the notch 2312 is located between the end face of the first end 2313 and the end face of the second end 2314 in the circumferential direction of the through hole 2311.

[0171] For example, the minimum distance L between the first end 2313 and the second end 2314 can be 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1mm, 1.05mm, 1.1mm, 1.15mm, 1.2mm, 1.25mm, 1.3mm, 1.35mm, 1.4mm, 1.45mm, or 1.5mm, etc.

[0172] In this embodiment, the minimum distance between the first end 2313 and the second end 2314 of the first support portion 231, which are opposite each other in the circumferential direction of the through hole 2311, is 0.3mm to 1.5mm. Setting the minimum distance between the first end 2313 and the second end 2314 to be greater than or equal to 0.3mm can increase the space dimension of the first support portion 231 that is compressed when the electrode assembly 22 expands, thereby further reducing the rigid support of the support member 23 on the hole wall of the winding center hole 221. This can further alleviate the phenomenon of a surge in internal pressure in the battery cell 20 during use, and further reduce the cost of the electrode assembly 22. There is a risk of damage and cracking, or deformation and connection failure of the outer casing 21. On the other hand, setting the minimum distance between the first end 2313 and the second end 2314 to less than or equal to 1.5mm can improve the structural strength of the support member 23, which is conducive to improving the support effect of the support member 23 on the hole wall of the winding center hole 221. This can further alleviate the phenomenon of collapse of the electrode assembly 22 at the winding center hole 221 during use, thereby further reducing the risk of lithium plating or even breakage and cracking of the electrode assembly 22 during use, and further reducing the phenomenon of capacity drop of the battery cell 20 during use.

[0173] According to some embodiments of this application, see Figure 5 and Figure 6 As shown, the notch 2312 extends along the first direction X, that is, the notch 2312 is a strip structure extending along the first direction X, and the notch 2312 penetrates the end faces of both ends of the first support part 231 along the first direction X.

[0174] In this embodiment, by setting the notch 2312 as a structure that extends along the first direction X and penetrates both ends of the first support portion 231, on the one hand, the difficulty of setting the notch 2312 on the first support portion 231 can be reduced, thereby reducing the manufacturing difficulty of the support member 23. On the other hand, when the electrode assembly 22 expands, the compression effect of the first support portion 231 of the support member 23 can be improved, thereby reducing the rigid support of the support member 23 on the hole wall of the winding center hole 221, and making it easier for the first support portion 231 of the support member 23 to rebound when the electrode assembly 22 contracts.

[0175] According to some embodiments of this application, see Figure 7 As shown, the wall thickness of the through hole 2311 is T, which satisfies 0.6mm≤T≤1.4mm.

[0176] Wherein, T is the thickness of the hole wall of the through hole 2311 in the radial direction of the through hole 2311, and similarly, T is also the distance between the hole wall surface of the through hole 2311 and the outer peripheral surface of the first support part 231 in the radial direction of the through hole 2311.

[0177] For example, the wall thickness T of the through hole 2311 can be 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1mm, 1.05mm, 1.1mm, 1.15mm, 1.2mm, 1.25mm, 1.3mm, 1.35mm or 1.4mm, etc.

[0178] In this embodiment, on the one hand, by setting the wall thickness of the through hole 2311 of the first support portion 231 to be greater than or equal to 0.6 mm, the structural strength of the first support portion 231 can be improved, thereby reducing the risk of cracking or damage to the first support portion 231 during compression, thus effectively improving the stability and reliability of the support member 23. On the other hand, by setting the wall thickness of the through hole 2311 of the first support portion 231 to be less than or equal to 1.4 mm, the difficulty of compressing the first support portion 231 of the support member 23 can be reduced when the electrode assembly 22 expands, thereby further reducing the rigid support of the support member 23 on the hole wall surface of the winding center hole 221, thereby further alleviating the phenomenon of a surge in internal pressure in the battery cell 20 during use, and further reducing the risk of damage and cracking of the electrode assembly 22 or deformation and connection failure of the outer shell 21.

[0179] According to some embodiments of this application, please continue to refer to Figure 7 As shown, the diameter of the through hole 2311 is D1, which satisfies 1.5mm≤D1≤5.5mm.

[0180] For example, the diameter D1 of the through hole 2311 can be 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, 5mm, 5.1mm, 5.2mm, 5.3mm, 5.4mm, or 5.5mm, etc.

[0181] In this embodiment, on the one hand, by setting the diameter of the through hole 2311 of the first support portion 231 to be greater than or equal to 1.5 mm, the first support portion 231 can be easily compressed when the electrode assembly 22 expands. This reduces the difficulty of compressing the first support portion 231 of the support member 23 while enabling the support member 23 to support the wall surface of the winding center hole 221. On the other hand, by setting the diameter of the through hole 2311 of the first support portion 231 to be less than or equal to 5.5 mm, the support difficulty of the support member 23 can be reduced, and the phenomenon of the size of the support member 23 and the wall thickness of the through hole 2311 being limited due to excessive space occupied by the through hole 2311 can be reduced. This can effectively improve the structural strength of the support member 23, reduce the risk of cracking or damage to the first support portion 231 during compression, and improve the stability and reliability of the support member 23.

[0182] According to some embodiments of this application, please refer to Figure 4 and Figure 7 As shown, the outer diameter of the first support part 231 is D2, and the diameter of the winding center hole 221 is D3, satisfying 0.79≤D2 / D3≤1.

[0183] For example, the ratio of the outer diameter D2 of the first support portion 231 to the diameter D3 of the winding center hole 221 can be 0.79, 0.8, 0.81, 0.82, 0.83, 0.84, 0.85, 0.86, 0.87, 0.88, 0.89, 0.9, 0.91, 0.92, 0.93, 0.94, 0.95, 0.96, 0.97, 0.98, 0.99, or 1, etc.

[0184] In this embodiment, the ratio of the outer diameter of the first support portion 231 to the diameter of the winding center hole 221 is 0.79 to 1. Setting this ratio to be greater than or equal to 0.79 reduces the gap between the support member 23 and the hole wall of the winding center hole 221, thereby improving the support effect of the support member 23 on the hole wall of the winding center hole 221. This further alleviates the phenomenon of the electrode assembly 22 collapsing at the winding center hole 221 during use, and further reduces the risk of the electrode assembly 22 collapsing during use. This design mitigates the risks of lithium plating or even breakage and cracking, and further reduces the drop in capacity of the battery cell 20 during use. On the other hand, setting the ratio of the outer diameter of the first support 231 to the diameter of the winding center hole 221 to be less than or equal to 1 facilitates the assembly of the support 23 into the winding center hole 221, thereby reducing the assembly difficulty between the support 23 and the electrode assembly 22. Furthermore, during the assembly of the support 23 into the winding center hole 221, it effectively alleviates the scratching and wear of the support 23 on the electrode assembly 22, thereby improving the assembly quality of the battery cell 20.

[0185] In some embodiments, see Figure 7 As shown, the outer diameter of the first support part 231 is D2, which satisfies 3.5mm≤D2≤5.5mm.

[0186] For example, the outer diameter D2 of the first support portion 231 can be 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, 5mm, 5.1mm, 5.2mm, 5.3mm, 5.4mm, or 5.5mm, etc.

[0187] In this embodiment, by setting the outer diameter of the first support portion 231 of the support member 23 to 3.5mm to 5.5mm, the support effect of the support member 23 on the hole wall of the winding center hole 221 is improved, while the assembly difficulty between the support member 23 and the electrode assembly 22 is further reduced and the assembly quality of the battery cell 20 is further improved.

[0188] According to some embodiments of this application, see Figure 5 , Figure 6 and Figure 7 As shown, the support member 23 may also include a second support portion 232, which is disposed in the through hole 2311. The second support portion 232 has a plurality of connecting ends 232a, which are arranged at intervals along the circumference of the through hole 2311 and are all connected to the hole wall surface of the through hole 2311.

[0189] The second support portion 232 has multiple connecting ends 232a, which are arranged at intervals along the circumference of the through hole 2311 and are all connected to the hole wall of the through hole 2311. In other words, multiple areas of the second support portion 232 are connected to the hole wall of the through hole 2311, and the multiple positions where the second support portion 232 and the hole wall of the through hole 2311 are connected to each other are arranged at intervals along the circumference of the through hole 2311.

[0190] For example, the second support portion 232 is a structure that extends along the first direction X, and the second support portion 232 is inserted into the through hole 2311 along the first direction X.

[0191] Optionally, the first support portion 231 and the second support portion 232 can be integrally formed. For example, the first support portion 231 and the second support portion 232 can be made by an integral forming process such as injection molding or extrusion molding. Of course, the first support portion 231 and the second support portion 232 can be separately set. For example, the second support portion 232 can be connected to the hole wall of the through hole 2311 by a structure such as bonding or snap-fitting.

[0192] In this embodiment, by providing a second support portion 232 within the through hole 2311 of the first support portion 231, and having multiple connecting ends 232a of the second support portion 232 connected to the hole wall of the through hole 2311, the second support portion 232 is structured to be connected to the hole wall of the through hole 2311 at multiple positions in the circumferential direction of the through hole 2311. This allows the second support portion 232 to support the hole wall of the through hole 2311 of the first support portion 231, thereby improving the structural strength of the support member 23 and reducing the risk of cracking or damage to the support member 23 during compression. It also improves the support effect of the support member 23 on the hole wall of the winding center hole 221, further mitigating the phenomenon of collapse of the electrode assembly 22 at the winding center hole 221 during use.

[0193] In some embodiments, see Figure 7 As shown, the second support portion 232 is configured to bend and deform when the first support portion 231 is compressed, and to recover its deformation when the first support portion 231 is reset. In other words, the second support portion 232 has the ability to elastically deform, and can bend and deform when the first support portion 231 is compressed and deformed by the electrode assembly 22, and can recover its deformation when the compressive force applied to the first support portion 231 by the electrode assembly 22 is removed and the first support portion 231 is reset.

[0194] In this embodiment, by configuring the second support portion 232 to be able to bend and deform when the first support portion 231 is compressed, and to recover its deformation when the first support portion 231 is reset, on the one hand, the second support portion 232 can not only support the first support portion 231, but also reduce the obstruction of the first support portion 231 when the first support portion 231 is compressed, thereby reducing the rigid support of the support member 23 on the hole wall of the winding center hole 221. This allows the electrode assembly 22 to still compress the support member 23 when it expands during use, so that the expansion of the electrode assembly 22 can be released at the winding center hole 221. On the other hand, after the first support portion 231 is compressed, the second support portion 232 can assist the first support portion 231 in recovery, which helps to reduce the risk of the first support portion 231 collapsing after being compressed.

[0195] According to some embodiments of this application, see Figure 6 and Figure 7 As shown, the second support portion 232 may include a plurality of support ribs 2321 arranged circumferentially along the through hole 2311, with one end of each of the plurality of support ribs 2321 connected and the other end being a connecting end 232a.

[0196] Among them, one end of each of the multiple support ribs 2321 is connected, and the other end is a connecting end 232a. That is to say, one end of each of the multiple support ribs 2321 is a structure that is interconnected, and the other end of each support rib 2321 is connected to the wall surface of the through hole 2311.

[0197] For example, in Figure 7 In the middle, the second support part 232 is provided with four support ribs 2321. The four support ribs 2321 are arranged circumferentially along the through hole 2311, and in the projection plane perpendicular to the thickness direction of the wall, the extension directions of the orthographic projections of two adjacent support ribs 2321 are perpendicular to each other.

[0198] In this embodiment, the second support part 232 is provided with a plurality of support ribs 2321 arranged circumferentially along the through hole 2311, and one end of the support rib 2321 is connected to other support ribs 2321, and the other end is connected to the hole wall of the through hole 2311, so that the second support part 232 supports the hole wall of the through hole 2311 of the first support part 231. The structure is simple, easy to manufacture, and has a good support effect.

[0199] In some embodiments, in a projection plane perpendicular to the first direction X, the orthographic projection of the central axis of the through hole 2311 lies within the orthographic projection of the connection area of ​​the plurality of support ribs 2321. That is, the connection position of the plurality of support ribs 2321 is located on the central axis of the through hole 2311. Similarly, in a projection plane perpendicular to the thickness direction of the wall, the orthographic projection of the connection area of ​​the support rib 2321 coincides with the center of the orthographic projection of the hole wall of the through hole 2311. That is, in a projection plane perpendicular to the thickness direction of the wall, the orthographic projection of the support rib 2321 is a structure extending radially along the through hole 2311.

[0200] In this embodiment, by setting the orthographic projection of the central axis of the through hole 2311 in the projection plane perpendicular to the first direction X to be located in the orthographic projection of the connection area of ​​the multiple support ribs 2321 in the projection plane perpendicular to the first direction X, the connection position of the multiple support ribs 2321 is located on the central axis of the through hole 2311, thereby further improving the support effect of the second support part 232 on the hole wall of the through hole 2311 of the first support part 231.

[0201] According to some embodiments of this application, see Figure 7 As shown, in the projection plane perpendicular to the first direction X, the width of the orthographic projection of the support rib 2321 is W, which satisfies 0.15mm≤W≤0.35mm.

[0202] For example, in a projection plane perpendicular to the first direction X, the width W of the orthographic projection of the support rib 2321 can be 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.2mm, 0.21mm, 0.22mm, 0.23mm, 0.24mm, 0.25mm, 0.26mm, 0.27mm, 0.28mm, 0.29mm, 0.3mm, 0.31mm, 0.32mm, 0.33mm, 0.34mm, or 0.35mm, etc.

[0203] In this embodiment, on the one hand, by setting the width of the orthographic projection of the support rib 2321 in the projection plane perpendicular to the first direction X to be greater than or equal to 0.15mm, the structural strength of the support rib 2321 can be improved, thereby reducing the risk of breakage or damage during use. This is beneficial to improving the stability and reliability of the second support part 232. On the other hand, by setting the width of the orthographic projection of the support rib 2321 in the projection plane perpendicular to the first direction X to be less than or equal to 0.35mm, the manufacturing difficulty of the support rib 2321 and the difficulty of setting it in the through hole 2311 can be reduced. It can also alleviate the phenomenon that the support strength of the support rib 2321 on the hole wall of the through hole 2311 of the first support part 231 is too great, which causes the first support part 231 to be unable to be effectively compressed.

[0204] According to some embodiments of this application, see Figure 7 As shown, the second support portion 232 includes at least one set of support ribs 2321, and each set of support ribs 2321 includes two support ribs 2321. In the projection plane perpendicular to the first direction X, the length directions of the orthographic projections of the two support ribs 2321 in the same set are parallel.

[0205] In the projection plane perpendicular to the first direction X, the length directions of the orthographic projections of the two support ribs 2321 in the same group are parallel. That is, in the cross section perpendicular to the first direction X, the directions of the two support ribs 2321 in the same group from the end where the two support ribs 2321 are connected to each other to their respective connecting ends 232a are parallel to each other, so that the two connecting ends 232a of the two support ribs 2321 are arranged opposite each other.

[0206] For example, in Figure 7 In the middle, the second support part 232 includes two sets of support ribs 2321. The two support ribs 2321 in each set of support ribs 2321 are connected to each other to form a plate-like structure. In the projection plane perpendicular to the first direction X, the orthographic projection of the two support ribs 2321 in one set of support ribs 2321 is a structure that is perpendicular to the orthographic projection of the two support ribs 2321 in the other set of support ribs 2321.

[0207] In this embodiment, by setting the orthographic projections of the two support ribs 2321 in the same group onto a projection plane perpendicular to the first direction X as parallel to each other, the angle between the two support ribs 2321 in the same group and the through hole 2311 in the circumferential direction is 180 degrees. This makes the two support ribs 2321 in the same group connected at one end and respectively arranged opposite to each other. The second support part 232 with this structure can improve the support effect of the second support part 232 on the hole wall of the through hole 2311 of the first support part 231, thereby further reducing the risk of cracking or damage of the support member 23 during compression, and further improving the support effect of the support member 23 on the hole wall of the winding center hole 221, so as to further alleviate the phenomenon of collapse of the electrode assembly 22 at the winding center hole 221 during use.

[0208] In some embodiments, see Figure 6 and Figure 7 As shown, along the circumference of the through hole 2311, the extension directions of the orthographic projections of two adjacent support ribs 2321 in a projection plane perpendicular to the first direction X are perpendicular to each other. That is, in the circumference of the through hole 2311, the thickness directions of two adjacent support ribs 2321 are perpendicular to each other.

[0209] In this embodiment, by setting the orthographic projections of two adjacent support ribs 2321 in the circumferential direction of the through hole 2311 in a projection plane perpendicular to the first direction X to be mutually perpendicular, the thickness directions of the two adjacent support ribs 2321 in the circumferential direction of the through hole 2311 are perpendicular to each other, so as to reduce the connection difficulty between multiple support ribs 2321 and further improve the support effect of the support ribs 2321 of the second support part 232 on the hole wall of the through hole 2311.

[0210] According to some embodiments of this application, in conjunction with Figure 6 and Figure 7 As shown, the support rib 2321 is a plate-like structure extending along the first direction X, that is, the thickness direction of the support rib 2321 is perpendicular to the radial direction of the through hole 2311.

[0211] In this embodiment, by setting the support rib 2321 as a plate-like structure extending along the first direction X, the manufacturing difficulty of the second support part 232 can be reduced, and the connection difficulty of multiple support ribs 2321 can be reduced. On the other hand, the support rib 2321 can support the hole wall surface of the through hole 2311 at multiple positions in the first direction X, which is beneficial to improving the support effect of the support rib 2321 of the second support part 232 on the hole wall surface of the through hole 2311.

[0212] According to some embodiments of this application, see Figure 7 As shown, the first support portion 231 and the second support portion 232 are integrally formed.

[0213] In this embodiment, by setting the first support portion 231 and the second support portion 232 of the support member 23 as an integrally formed structure, the connection stability and reliability between the first support portion 231 and the second support portion 232 can be improved, which helps to reduce the risk of the second support portion 232 detaching from the through hole 2311 during use.

[0214] According to some embodiments of this application, the elastic modulus of the material of the support member 23 is E, which satisfies 800MPa≤E≤2000MPa.

[0215] For example, the elastic modulus of the material of the support member 23 may be 800MPa, 850MPa, 900MPa, 950MPa, 1000MPa, 1100MPa, 1200MPa, 1300MPa, 1400MPa, 1500MPa, 1600MPa, 1700MPa, 1800MPa, 1900MPa or 2000MPa, etc.

[0216] For example, the material of the support member 23 may be polyethylene or polypropylene, etc.

[0217] In this embodiment, by setting the elastic modulus of the material of the support member 23 to 800MPa to 2000MPa, on the one hand, it can alleviate the phenomenon that the support member 23 is too soft, resulting in poor support effect on the hole wall of the winding center hole 221. It also facilitates the rebound of the first support part 231 of the support member 23 when the electrode assembly 22 contracts, thereby further mitigating the risk of the electrode assembly 22 collapsing at the winding center hole 221 during use. On the other hand, it can alleviate the rigid support of the support member 23 on the hole wall of the winding center hole 221 caused by the support member 23 being too hard, so that the support member 23 can be compressed when the electrode assembly 22 expands during use, which helps to reduce the risk of a sharp increase in internal pressure in the battery cell 20 during use.

[0218] According to some embodiments of this application, in conjunction with Figure 8 and Figure 9 As shown, the electrode assembly 22 includes a first electrode 222 and a second electrode 223 with opposite polarities, both wound around a central hole 221. The first electrode 222 includes a first current collector 2222 and a first active material layer 2223, with the first active material layer 2223 disposed on at least one side of the first current collector 2222 in the radial direction of the central hole 221. The second electrode 223 includes a second current collector 2232 and a second active material layer 2233, with the second active material layer 2233 disposed on at least one side of the second current collector 2232 in the radial direction of the central hole 221. Along the first direction X, the second active material layer 2233 extends beyond both ends of the first active material layer 2223, and the first support portion 231 extends beyond both ends of the first active material layer 2223.

[0219] The first electrode 222 and the second electrode 223 are the positive electrode and the negative electrode of the electrode assembly 22, respectively. Correspondingly, the electrode assembly 22 is also provided with an isolation member 224, which is disposed between the first electrode 222 and the second electrode 223 to separate the first electrode 222 and the second electrode 223. The first electrode 222, the second electrode 223 and the isolation member 224 are wound together to form a winding center hole 221, so that the first electrode 222, the second electrode 223 and the isolation member 224 are all structures arranged around the winding center hole 221.

[0220] For example, in Figure 9 In the first electrode assembly 22, the first electrode tab 2221 is connected to one end of the first current collector 2222 in the first direction X, and the second electrode tab 2231 is connected to one end of the second current collector 2232 in the first direction X. The first electrode tab 2221 and the second electrode tab 2231 are respectively located at both ends of the electrode assembly 22 in the first direction X.

[0221] For example, the first electrode 222 is a positive electrode and the second electrode 223 is a negative electrode. Correspondingly, the first active material layer 2223 includes a positive active material and the second active material layer 2233 includes a negative active material. By setting the second active material layer 2233 to extend beyond both ends of the first active material layer 2223 in the first direction X, the risk of lithium plating in the electrode assembly 22 during use can be reduced.

[0222] In this embodiment, by setting the first support portion 231 of the support member 23 to extend beyond both ends of the first active material layer 2223 in the first direction X, the support member 23 can support the area where the first active material layer 2223 of the first electrode 222 and the second active material layer 2233 of the second electrode 223 are stacked, thereby effectively improving the support effect of the support member 23 on the first electrode 222 and the second electrode 223, further alleviating the phenomenon of collapse at the winding center hole 221 of the electrode assembly 22 during use, thereby further reducing the risk of lithium plating or even breakage and cracking of the electrode assembly 22 during use, and further reducing the phenomenon of capacity drop of the battery cell 20 during use.

[0223] In some embodiments, see Figure 9 As shown, neither end of the first support portion 231 extends beyond the ends of the second active material layer 2233 in the first direction X. That is, the end of the first support portion 231 is located between the end of the first active material layer 2223 and the end of the second active material layer 2233 in the first direction X.

[0224] In this embodiment, by setting the two ends of the first support portion 231 of the support member 23 in the first direction X to not exceed the two ends of the second active material layer 2233, the support member 23 can effectively reduce the space occupied by the support member 23 while improving the support effect of the support member 23 on the first electrode 222 and the second electrode 223, so as to reduce the interference between the support member 23 and other components inside the battery cell 20.

[0225] Of course, the structure of the battery cell 20 is not limited to this. In some embodiments, the battery cell 20 can also have other structures. For example, the first electrode 222 further includes a first tab 2221, which is connected to one end of the first current collector 2222 in the first direction X. The second electrode 223 further includes a second tab 2231, which is connected to one end of the second current collector 2232 in the first direction X. The first support portion 231 extends beyond both ends of the second active material layer 2233 in the first direction X. Along the first direction X, the first support portion 231 does not extend beyond the end of the first tab 2221 away from the first current collector 2222, and the first support portion 231 does not extend beyond the end of the second tab 2231 away from the second current collector 2232.

[0226] The first tab 2221 and the second tab 2231 are respectively connected to one end of the first current collector 2222 and the second current collector 2232 in the first direction X. The first tab 2221 and the first tab 2221 can be located at the same end of the electrode assembly 22 in the first direction X, or they can be located at both ends of the electrode assembly 22 in the first direction X.

[0227] The first support portion 231 extends beyond both ends of the second active material layer 2233 in the first direction X, that is, the second active material layer 2233 is located between the two ends of the first support portion 231 in the first direction X.

[0228] Along the first direction X, the first support portion 231 does not extend beyond the end of the first electrode tab 2221 away from the first current collector 2222, and the first support portion 231 does not extend beyond the end of the second electrode tab 2231 away from the second current collector 2232. In embodiments where the first electrode tab 2221 and the second electrode tab 2231 are located at the same end of the electrode assembly 22 in the first direction X, the end of the first support portion 231 near the first electrode tab 2221 and the second electrode tab 2231 in the first direction X is neither beyond the first electrode tab 2221 nor... In embodiments where the first electrode 2221 and the second electrode 2231 are located at opposite ends of the electrode assembly 22 in the first direction X, the first support portion 231 is a structure in which the two ends in the first direction X do not extend beyond the first electrode 2221 and the second electrode 2231, respectively, such that the first support portion 231 is a structure located in the first direction X between the surface of the first electrode 2221 facing away from the second electrode 2231 and the surface of the second electrode 2231 facing away from the first electrode 2221.

[0229] In this embodiment, by configuring the first support portion 231 to extend beyond both ends of the second active material layer 2233 in the first direction X, and not to extend beyond the end of the first tab 2221 away from the first current collector 2222 and the end of the second tab 2231 away from the second current collector 2232, the support member 23 can also support the inner side of the first tab 2221 and the second tab 2231 near the winding center hole 221. This can alleviate the phenomenon of the first tab 2221 and the second tab 2231 collapsing at the winding center hole 221, thereby reducing the risk of the first tab 2221 or the second tab 2231 being inserted backward into the first active material layer 2223 or the second active material layer 2233, causing an internal short circuit in the battery cell 20, and thus improving the reliability of the battery cell 20.

[0230] In an embodiment where the first support portion 231 does not extend beyond the end of the first tab 2221 away from the first current collector 2222, and the first support portion 231 does not extend beyond the end of the second tab 2231 away from the second current collector 2232, the first tab 2221 and the second tab 2231 are respectively formed at both ends of the electrode assembly 22 along the first direction X. The two ends of the first support portion 231 in the first direction X respectively do not extend beyond the end of the first tab 2221 away from the first current collector 2222 and the end of the first support portion 231 away from the second tab 2231 away from the second current collector 2232.

[0231] In this embodiment, by disposing the first tab 2221 and the second tab 2231 at both ends of the electrode assembly 22 in the first direction X, the first support portion 231 is positioned such that its two ends in the first direction X do not exceed the structure of the first tab 2221 and the second tab 2231. This achieves separation between the first tab 2221 and the second tab 2231, reducing the risk of short circuits during use. It also reduces the assembly difficulty between the support member 23 and the electrode assembly 22, thereby reducing the manufacturing difficulty of the battery cell 20. Furthermore, it facilitates the support member 23 in supporting the first tab 2221 and the second tab 2231 respectively.

[0232] Of course, the battery cell 20 can also have other structures. For example, in some embodiments, the electrode assembly 22 further includes a separator 224, which is disposed between the first electrode 222 and the second electrode 223 to separate the first electrode 222 and the second electrode 223. Along the first direction X, the separator 224 extends beyond both ends of the second active material layer 2233. The first support portion 231 extends beyond both ends of the second active material layer 2233 in the first direction X, and neither end of the first support portion 231 in the first direction X extends beyond both ends of the separator 224 in the first direction X.

[0233] The insulating element 224 serves to insulate and separate the first electrode 222 and the second electrode 223. For example, the insulating element 224 is an insulating membrane.

[0234] In the first direction X, the separator 224 extends beyond both ends of the second active material layer 2233, that is, the second active material layer 2233 is located between the two ends of the separator 224 in the first direction X.

[0235] The first support portion 231 extends beyond both ends of the second active material layer 2233 in the first direction X, and neither end of the first support portion 231 in the first direction X extends beyond both ends of the separator 224 in the first direction X. That is, the end of the first support portion 231 is located between the end of the second active material layer 2233 and the end of the separator 224 in the first direction X.

[0236] In this embodiment, an isolator 224 is further provided between the first electrode 222 and the second electrode 223 of the electrode assembly 22, so that the isolator 224 can separate the first electrode 222 and the second electrode 223, thereby reducing the risk of short circuit between the first electrode 222 and the second electrode 223. In this embodiment, by setting the first support portion 231 to extend beyond the two ends of the second active material layer 2233 in the first direction X, but not beyond the two ends of the isolator 224 in the first direction X, the support portion 23 can also support the two ends of the isolator 224 in the first direction X, thereby reducing the phenomenon that the separation effect of the first electrode 222 and the second electrode 223 is poor after the two ends of the isolator 224 collapse or wrinkle, thereby further reducing the risk of short circuit between the first electrode 222 and the second electrode 223, and improving the reliability of the battery cell 20.

[0237] According to some embodiments of this application, see Figure 3 and Figure 4 As shown, the electrode assembly 22 is cylindrical, and its central axis extends along the first direction X. Correspondingly, the outer casing 21 of the battery cell 20 is also cylindrical.

[0238] In this embodiment, by setting the electrode assembly 22 to a cylindrical shape, it is easier to process and form the cylindrical battery cell 20, which gives the battery cell 20 advantages such as high capacity, long cycle life, and wide operating temperature range. Furthermore, by setting the central axis of the electrode assembly 22 to a cylindrical structure extending along the first direction X, it is easier to form a winding center hole 221 extending along the first direction X, thereby facilitating the assembly of the support member 23 into the winding center hole 221 and reducing the assembly difficulty of the battery cell 20.

[0239] According to some embodiments of this application, this application also provides a battery device 100, which includes a battery cell 20 of any of the above schemes.

[0240] Among them, see Figure 2 As shown, the battery device 100 may also include a housing 10, in which the battery cells 20 are housed.

[0241] 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.

[0242] 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.

[0243] Of course, the box 10 formed by the first box body 11 and the second box body 12 can be of various shapes, such as a cylinder or a cuboid. For example, in... Figure 2 In the middle, box 10 has a rectangular structure.

[0244] Optionally, the battery cell 20 disposed within the housing 10 can be one or more. For example, in... Figure 2 In the battery device 100, multiple battery cells 20 are arranged inside the housing 10. The multiple battery cells 20 can be connected in series, parallel, or in a mixed manner. A mixed connection means that the multiple battery cells 20 are connected in both series and parallel. The multiple battery cells 20 can be directly connected in series, parallel, or in a mixed manner, and then the whole assembly of the multiple battery cells 20 is housed in the housing 10. Of course, the battery device 100 can also be formed by first connecting multiple battery cells 20 in series, parallel, or in a mixed manner to form a battery module, and then connecting multiple battery modules in series, parallel, or in a mixed manner to form a whole assembly, which is also housed in the housing 10.

[0245] 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.

[0246] 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.

[0247] According to some embodiments of this application, this application also provides an electrical device, which includes a battery cell 20 of any of the above schemes, and the battery cell 20 is used to provide electrical energy to the electrical device.

[0248] The electrical device can be any of the aforementioned devices or systems that utilize battery cells 20.

[0249] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0250] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell, characterized by, The electrode assembly comprises: a housing; an electrode assembly accommodated in the housing, the electrode assembly being in a wound structure, the electrode assembly having a wound central hole, and the wound central hole extending in a first direction; and a support member at least partially disposed in the wound central hole, the support member comprising a first support portion extending in the first direction; wherein the first support portion is provided with a through hole extending in the first direction and penetrating end faces of both ends of the first support portion, and the first support portion is further provided with a notch penetrating an outer peripheral surface of the first support portion and a hole wall surface of the through hole. The notch penetrates the end face of at least one end of the first support portion in the first direction.

2. The battery cell of claim 1, wherein, The notch penetrates the end faces of both ends of the first support portion in the first direction.

3. The battery cell of claim 2, wherein, The first support portion has opposite first and second ends in the circumferential direction of the through hole, and the notch is formed between the first and second ends; 4. The battery cell of claim 3, wherein, wherein the minimum distance between the first and second ends is L, satisfying 0.3mm≤L≤1.5mm. The notch extends in the first direction.

5. The battery cell of claim 3, wherein, The wall thickness of the hole wall of the through hole is T, satisfying 0.6mm≤T≤1.4mm.

6. The battery cell of claim 1, wherein, The diameter of the through hole is D1, satisfying 1.5mm≤D1≤5.5mm.

7. The battery cell of claim 1, wherein, The outer diameter of the first support portion is D2, and the diameter of the wound central hole is D3, satisfying 0.79≤D2 / D3≤1.

8. The battery cell of claim 1, wherein, 3.5mm≤D2≤5.5mm.

9. The battery cell of claim 8, wherein, The support member further comprises:

10. The battery cell of any one of claims 1-9, wherein, a second support portion disposed in the through hole, the second support portion having a plurality of connection ends spaced apart in the circumferential direction of the through hole and connected to the hole wall surface of the through hole. The second support portion is configured to be deformed when the first support portion is compressed and to recover the deformation when the first support portion is reset.

11. The battery cell of claim 10, wherein, The second support portion comprises a plurality of support ribs arranged in the circumferential direction of the through hole, one end of each of the plurality of support ribs being connected, and the other end being the connection end.

12. The battery cell of claim 10, wherein, In a projection plane perpendicular to the first direction, the normal projection of the central axis of the through hole is located within the normal projection of the connection region of the plurality of support ribs.

13. The battery cell of claim 12, wherein, In a projection plane perpendicular to the first direction, the width of the normal projection of the support rib is W, satisfying 0.15mm≤W≤0.35mm.

14. The battery cell of claim 12, wherein, The second support portion comprises at least one group of support ribs, each group of support ribs comprising two support ribs; 15. The battery cell of claim 12, wherein, wherein, in a projection plane perpendicular to the first direction, the length direction of the normal projection of the two support ribs in the same group is parallel. Along the circumferential direction of the through hole, the extension directions of the normal projections of every two adjacent support ribs in the projection plane perpendicular to the first direction are perpendicular to each other.

16. The battery cell of claim 12, wherein, The support rib is a plate-like structure extending in the first direction.

17. The battery cell of claim 12, wherein, The first support portion and the second support portion are integrally formed.

18. The battery cell of claim 10, wherein, The elastic modulus of the material of the support member is E, satisfying 800MPa≤E≤2000MPa.

19. The battery cell of any one of claims 1-9, wherein, ​ 20. The battery cell of any one of claims 1-9, wherein, The electrode assembly includes a first tab and a second tab having opposite polarities, the first tab and the second tab are each wound around the winding center hole; The first tab includes a first current collector and a first active material layer disposed on at least one side of the first current collector in the radial direction of the winding center hole, and the second tab includes a second current collector and a second active material layer disposed on at least one side of the second current collector in the radial direction of the winding center hole; Wherein, along the first direction, the second active material layer exceeds both ends of the first active material layer, and the first support portion exceeds both ends of the first active material layer.

21. The battery cell of claim 20, wherein, Both ends of the first support portion in the first direction do not exceed both ends of the second active material layer in the first direction.

22. The battery cell of claim 20, wherein, The first tab further includes a first tab, and the first tab is connected to one end of the first current collector in the first direction, and the second tab further includes a second tab, and the second tab is connected to one end of the second current collector in the first direction; Wherein, the first support portion exceeds both ends of the second active material layer in the first direction along the first direction, and along the first direction, the first support portion does not exceed one end of the first tab away from the first current collector, and the first support portion does not exceed one end of the second tab away from the second current collector.

23. The battery cell of claim 22, wherein, Along the first direction, the first tab and the second tab are respectively formed at both ends of the electrode assembly; Wherein, both ends of the first support portion in the first direction do not exceed one end of the first tab away from the first current collector and one end of the second tab away from the second current collector, respectively.

24. The battery cell of claim 20, wherein, The electrode assembly further includes a separator disposed between the first tab and the second tab to separate the first tab and the second tab, and along the first direction, the separator exceeds both ends of the second active material layer; Wherein, the first support portion exceeds both ends of the second active material layer in the first direction along the first direction, and both ends of the first support portion in the first direction do not exceed both ends of the separator in the first direction.

25. The battery cell of any one of claims 1-9, wherein, The electrode assembly is cylindrical, and a central axis of the electrode assembly extends along the first direction.

26. A battery device, characterized by The battery cell as claimed in any one of claims 1-25.

27. An electrical device, comprising: The battery cell as claimed in any one of claims 1-25 is used to provide electrical energy.

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