Battery monomer, battery device and electric equipment

Abstract

The invention discloses a battery monomer, a battery device and electric equipment. The invention relates to the technical field of batteries. The battery monomer disclosed by the invention has the technical effects that the strength of the fixing piece is enhanced, so that the failure phenomenon of the explosion-proof valve caused by the risk that the pole is broken prior to the explosion-proof valve is reduced, and the reliability of the battery monomer is improved. The battery monomer comprises a pole, an electrode assembly, a shell and a fixing piece, the pole is electrically connected with the electrode assembly, the electrode assembly is arranged in the shell, the shell is provided with a first wall, the pole is arranged on the first wall, the fixing piece comprises a first plane part, a transition part and a second plane part, the transition part is located between the first plane part and the second plane part, and the second plane part is located between the first plane part and the second plane part. The first plane part is clamped with the pole, the second plane part is connected with the first wall, and at least one of the thickness of the first plane part in the axial direction of the pole, the thickness of the second plane part in the axial direction of the pole and the thickness of the transition part in the direction perpendicular to the axial direction of the pole is larger than 0.8 mm and smaller than or equal to 1.5 mm.

Description

Technical Field

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

[0002] New energy batteries are being used more and more widely in daily life and industry. For example, new energy vehicles equipped with batteries are already in widespread use.

[0003] In related technologies, the terminals in a battery cell are snapped together with a fixing component, and the terminals are also connected to the casing through the fixing component. However, due to the inherent defects of the fixing component, the reliability of the battery cell is relatively weak. Summary of the Invention

[0004] This application provides a battery cell, a battery device, and an electrical appliance, which has the technical effect of strengthening the strength of the fixing component itself, thereby reducing the risk of the terminal post breaking before the explosion-proof valve and causing the explosion-proof valve to fail, and thus improving the reliability of the battery cell.

[0005] In a first aspect, this application provides a battery cell, which includes a terminal post, an electrode assembly, a housing, and a fixing member, wherein the terminal post and the electrode assembly are electrically connected; the electrode assembly is disposed within the housing, the housing having a first wall, and the terminal post is disposed on the first wall; the fixing member includes a first planar portion, a transition portion, and a second planar portion, the transition portion being located between the first planar portion and the second planar portion, the first planar portion engaging with the terminal post, and the second planar portion being connected to the first wall; at least one of the following thicknesses—the thickness of the first planar portion along the axial direction of the terminal post, the thickness of the second planar portion along the axial direction of the terminal post, and the thickness of the transition portion along a direction perpendicular to the axial direction of the terminal post—is greater than 0.8 mm and less than or equal to 1.5 mm.

[0006] The battery cell provided in this application has at least one thickness greater than 0.8 mm and less than 1.5 mm in the following three categories: the thickness of the first planar portion along the axial direction of the electrode post; the thickness of the second planar portion along the axial direction of the electrode post; and the thickness of the transition portion in the direction perpendicular to the axial direction of the electrode post. In contrast, in related technologies, the thicknesses of the first planar portion along the axial direction of the electrode post, the second planar portion along the axial direction of the electrode post, and the transition portion in the direction perpendicular to the axial direction of the electrode post are all less than 0.8 mm. Compared to related technologies, the battery cell provided in this application has at least one thickness greater than 0.8 mm and less than 1.5 mm in the first planar portion, the transition portion, and the second planar portion. Correspondingly, the strength of the fixing component itself is also enhanced, reducing the possibility of the fixing component breaking. On this basis, the risk of the electrode post breaking before the explosion-proof valve is reduced, leading to the failure of the explosion-proof valve, thereby improving the reliability of the battery cell.

[0007] In one possible implementation provided in this application, the thicknesses of the first planar portion along the axial direction of the pole post, the thickness of the second planar portion along the axial direction of the pole post, and the thickness of the transition portion along the direction perpendicular to the axial direction of the pole post are all greater than 0.8 mm and less than or equal to 1.5 mm.

[0008] The battery cell provided in this application further enhances the strength of the fixing component by making the thickness of the first flat portion along the axial direction of the electrode post, the thickness of the second flat portion along the axial direction of the electrode post, and the thickness of the transition portion in the direction perpendicular to the axial direction of the electrode post all greater than 0.8 mm and less than or equal to 1.5 mm. Correspondingly, it also further reduces the possibility of the fixing component breaking.

[0009] In one possible implementation provided in this application, the thickness of the first planar portion along the axial direction of the pole post, the thickness of the second planar portion along the axial direction of the pole post, and the thickness of the transition portion in the direction perpendicular to the axial direction of the pole post are all the same.

[0010] The battery cell provided in this application has the same thickness for the first planar portion along the axial direction of the electrode post, the second planar portion along the axial direction of the electrode post, and the transition portion in the direction perpendicular to the axial direction of the electrode post. This improves the consistency of the fixing component thickness and facilitates its processing and manufacturing.

[0011] In one possible implementation provided in this application, the thickness of the second planar portion along the axial direction of the pole post is greater than 0.8 mm and less than or equal to 1.5 mm, and the thickness of the first planar portion along the axial direction of the pole post is equal to 0.8 mm.

[0012] The battery cell provided in this application, since the second planar portion is connected to the first wall, improves the reliability of the connection between the second planar portion and the first wall by making the thickness of the second planar portion along the axial direction of the pole post greater than 0.8 mm and less than or equal to 1.5 mm. The thickness of the first planar portion along the axial direction of the pole post is equal to 0.8 mm, that is, the first planar portion is not thickened, so as to avoid the fastener being too heavy, which would lead to the battery cell being too heavy and not take advantage of the lightweight design of the battery cell.

[0013] In one possible implementation provided in this application, the thickness of the transition portion along the direction perpendicular to the pole post is the same as the thickness of the second planar portion along the pole post.

[0014] The battery cell provided in this application has the following advantages: the thickness of the transition portion in the direction perpendicular to the pole axis is the same as the thickness of the second planar portion in the direction of the pole axis, and the transition portion is located between the first planar portion and the second planar portion, which further improves the reliability of the connection between the second planar portion and the first wall.

[0015] In one possible implementation provided in this application, the ratio of the axial thickness of the first planar portion along the pole post to the axial thickness of the second planar portion along the pole post is greater than or equal to 0.4 and less than or equal to 0.9.

[0016] The battery cell provided in this application reduces the phenomenon of excessive thickness of the second flat portion, which would increase the overall height of the battery, by making the ratio of the axial thickness of the first flat portion along the pole post to the axial thickness of the second flat portion along the pole post greater than or equal to 0.4. The ratio of the axial thickness of the first flat portion along the pole post to the axial thickness of the second flat portion along the pole post is less than or equal to 0.9 to reduce the phenomenon of insufficient strength of the second flat portion and weak connection strength between the second flat portion and the first wall, which would cause the pole post to break before the explosion-proof valve.

[0017] In one possible implementation provided in this application, the ratio of the axial thickness of the first planar portion along the pole post to the axial thickness of the second planar portion along the pole post is greater than or equal to 0.5 and less than or equal to 0.85.

[0018] The battery cell provided in this application further reduces the phenomenon of excessive thickness of the second flat portion, which would otherwise increase the overall height of the battery, by making the ratio of the axial thickness of the first flat portion along the pole post to the axial thickness of the second flat portion along the pole post greater than or equal to 0.5. The ratio of the axial thickness of the first flat portion along the pole post to the axial thickness of the second flat portion along the pole post is less than or equal to 0.85, which further reduces the phenomenon of insufficient strength of the second flat portion and weak connection strength between the second flat portion and the first wall, thereby causing the pole post to break before the explosion-proof valve, and thus improving the reliability of the battery cell.

[0019] In one possible implementation provided in this application, the reinforcing protrusion of the transition portion facing the side near the pole post has a thickness in the direction perpendicular to the axial direction of the pole post, which is the thickness between the side of the reinforcing protrusion near the pole post and the side of the transition portion away from the pole post. And / or, the reinforcing protrusion of the transition portion facing the side away from the pole post has a thickness in the direction perpendicular to the axial direction of the pole post, which is the thickness between the side of the transition portion near the pole post and the side of the reinforcing protrusion away from the pole post. The thickness of the transition portion in the direction perpendicular to the axial direction of the pole post is greater than 0.8 mm and less than or equal to 1.5 mm.

[0020] The battery cell provided in this application has a thickness of more than 0.8 mm and less than or equal to 1.5 mm in the direction perpendicular to the axial direction of the terminal post by providing reinforcing protrusions on the side of the transition portion facing closer to the terminal post and / or providing reinforcing protrusions on the side of the transition portion facing away from the terminal post. In other words, it is equivalent to thickening the transition portion only at the location where reinforcing protrusions are provided, thereby improving the strength of the transition portion itself while reducing its weight.

[0021] In one possible implementation provided in this application, there are multiple reinforcing protrusions, which are distributed circumferentially on the transition portion along the pole post.

[0022] The battery cell provided in this application further improves the strength of the fixing component by distributing multiple reinforcing protrusions along the circumference of the electrode post on the transition portion.

[0023] In one possible implementation provided in this application, a weight-reducing groove is provided on the side of the transition portion away from the pole post along a direction perpendicular to the axial direction of the pole post, and a reinforcing protrusion is provided on the side of the transition portion facing the pole post, with the weight-reducing groove and the reinforcing protrusion opposite each other.

[0024] The battery cell provided in this application has a weight-reducing groove on the side of the transition portion away from the terminal post in a direction perpendicular to the axis of the terminal post, and a reinforcing protrusion is provided on the side of the transition portion facing the terminal post. The weight-reducing groove and the reinforcing protrusion are opposite each other. In this way, the strength of the transition portion itself is improved without increasing the weight of the transition portion, which is beneficial to the lightweight design of the battery cell.

[0025] In one possible implementation provided in this application, the battery cell further includes an insulating member and a through hole. The insulating member is located between the terminal post and the fixing member to insulate the terminal post from the fixing member. At least a portion of the insulating member is located on the wall of the through hole, which is located near the reinforcing protrusion at the transition portion.

[0026] The battery cell provided in this application reduces the likelihood of the transition section near the through hole being weaker and more prone to breakage by placing the through hole near the reinforcing protrusion in the transition section.

[0027] In one possible implementation provided in this application, there are multiple reinforcing protrusions, and through holes are disposed between the multiple reinforcing protrusions, with the multiple reinforcing protrusions evenly distributed along the circumference of the through holes.

[0028] The battery cell provided in this application further reduces the possibility that the transition section near the through hole is weaker and that the transition section near the through hole is more likely to break by arranging the through hole between multiple reinforcing protrusions and distributing the multiple reinforcing protrusions evenly along the circumference of the through hole.

[0029] In one possible implementation provided in this application, there are multiple reinforcing protrusions and multiple through holes, with each through hole corresponding to one of the multiple reinforcing protrusions.

[0030] The battery cell provided in this application further reduces the possibility of the transition section being weaker near the through holes and cracking preferentially near the through holes by making multiple through holes correspond one-to-one with multiple reinforcing protrusions.

[0031] In one possible implementation provided in this application, the thickness of the first wall along the axial direction of the pole post is greater than or equal to 1.5 mm and less than or equal to 3.0 mm.

[0032] The battery cell provided in this application reduces the possibility of the first wall separating from the casing due to excessive thinness, thereby reducing the likelihood of the electrode breaking before the explosion-proof valve, by making the thickness of the first wall greater than or equal to 1.5 mm and less than or equal to 3.0 mm along the axial direction of the electrode post.

[0033] In one possible implementation provided in this application, the first wall includes a connecting portion and a non-connecting portion, the connecting portion is welded to the second planar portion, and along the axial direction of the pole post, the sum of the thickness of the second planar portion and the thickness of the connecting portion is greater than the thickness of the non-connecting portion.

[0034] The battery cell provided in this application improves the reliability of the welding between the first wall and the second flat portion by making the sum of the thickness of the second flat portion and the thickness of the connecting portion greater than the thickness of the non-connecting portion along the axial direction of the electrode post.

[0035] In one possible implementation provided in this application, the thickness of the connecting portion is greater than the thickness of the non-connecting portion along the axial direction of the pole post.

[0036] The battery cell provided in this application has a connecting portion with a thickness greater than the non-connecting portion along the axial direction of the electrode post. In other words, a boss is formed on the first wall, and the second flat portion is welded to the boss. This facilitates welding by workers.

[0037] In one possible implementation provided in this application, the connecting portion has a groove. Along the axial direction of the pole post, the depth of the groove is less than the thickness of the second planar portion. The sum of the thickness between the side of the groove near the second planar portion and the side of the groove away from the second planar portion and the thickness of the second planar portion is greater than the thickness of the non-connecting portion.

[0038] The battery cell provided in this application has a groove on the connecting part, the depth of which is less than the thickness of the second flat part. In other words, a part of the second flat part is located in the groove, thus reducing the overall height of the battery cell.

[0039] In one possible implementation provided in this application, the connecting portion has a groove. Along the axial direction of the pole post, the depth of the groove is greater than the thickness of the second planar portion. The sum of the thickness between the side of the groove near the second planar portion and the side of the groove away from the second planar portion and the thickness of the second planar portion is greater than the thickness of the non-connecting portion.

[0040] The battery cell provided in this application has a groove on the connecting part, the depth of which is greater than the thickness of the second flat part. In other words, the second flat part is completely recessed into the groove, which further reduces the overall height of the battery cell.

[0041] In one possible implementation provided in this application, along the axial direction of the pole post, the welding depth between the second planar portion and the groove is less than or equal to the thickness of the second planar portion.

[0042] The battery cell provided in this application improves the aesthetics of the battery cell by making the welding depth between the second flat portion and the groove less than or equal to the thickness of the second flat portion along the axial direction of the electrode post. In other words, the welding material does not completely immerse the second flat portion.

[0043] In one possible implementation provided in this application, the gas production of a single battery cell is greater than or equal to 0.25 MPa and less than or equal to 0.45 MPa.

[0044] In one possible implementation provided in this application, the diameter of the pole post is greater than or equal to 18 mm and less than or equal to 36 mm.

[0045] Secondly, this application provides a battery device comprising a plurality of battery cells provided in any of the first aspects.

[0046] The battery device provided in this application, since it includes multiple battery cells provided in any of the first aspects, has the same technical effect, namely, it has the technical effect of strengthening the strength of the fixing component itself, thereby reducing the risk of the terminal post breaking before the explosion-proof valve and the failure of the explosion-proof valve, and thus improving the reliability of the battery cell.

[0047] Thirdly, this application provides an electrical device including at least one battery device provided by any of the second aspects for providing electrical energy.

[0048] The electrical equipment provided in this application includes at least one battery device provided by any of the second aspects for providing electrical energy, and the battery device includes multiple battery cells provided by any of the first aspects. Therefore, it has the same technical effect, namely, it has the technical effect of strengthening the strength of the fixing component itself, thereby reducing the risk of the terminal post breaking before the explosion-proof valve and the failure of the explosion-proof valve, thereby improving the reliability of the battery cells. Attached Figure Description

[0049] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0050] Figure 1 This is a first-view structural diagram of a battery cell provided in an embodiment of this application;

[0051] Figure 2 This is a second-view structural schematic diagram of a battery cell provided in an embodiment of this application;

[0052] Figure 3A schematic cross-sectional view of a single battery cell provided in an embodiment of this application;

[0053] Figure 4 Provided for the embodiments of this application Figure 1 Enlarged view of point A in the middle;

[0054] Figure 5 An exploded view of the portion of the fixing member provided in the embodiment of this application, which has a reinforcing protrusion and an insulating member facing the side near the pole post, and the pole post itself;

[0055] Figure 6 Provided for the embodiments of this application Figure 5 A schematic diagram of a structure in which a reinforcing protrusion is provided on the side of the fixing component facing closer to the pole post;

[0056] Figure 7 Provided for the embodiments of this application Figure 6 A cross-sectional schematic diagram of the fastener in the diagram;

[0057] Figure 8 Provided for the embodiments of this application Figure 6 A bottom view of the fasteners in the diagram;

[0058] Figure 9 The fastener provided in this application embodiment has a weight-reducing groove on the side facing away from the pole post, a reinforcing protrusion and an insulating part on the side facing closer to the pole post, and an exploded view of the pole post.

[0059] Figure 10 Provided for the embodiments of this application Figure 9 A schematic diagram of the fastener structure in the diagram;

[0060] Figure 11 Provided for the embodiments of this application Figure 9 A bottom view of the fasteners in the diagram.

[0061] Explanation of reference numerals in the attached figures

[0062] 1-Battery cell; 11-Housing; 111-First wall; 1111-Connecting part; 11111-Groove; 1112-Non-connecting part; 12-Terminal post; 13-Fixing component; 131-First flat part; 132-Second flat part; 133-Transition part; 1331-Through hole; 1332-Weight reduction groove; 1333-Reinforcing protrusion; 14-Explosion-proof valve; 15-Adapter; 16-Insulating component. Detailed Implementation

[0063] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0064] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein 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 specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0065] In the description of the embodiments of this application, technical terms such as "first," "second," and "third" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0066] In this document, the term "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 throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0067] In the description of the embodiments 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, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0068] In the description of the embodiments of this application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0069] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0070] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0071] The following is a detailed description of this application.

[0072] Currently, new energy batteries are being used more and more widely in daily life and industry. For example, new energy vehicles equipped with batteries are already in widespread use.

[0073] In related technologies, the terminal post in the battery cell is snapped into place with a fixing component, and the terminal post is also connected to the housing through the fixing component. However, due to the design of the fixing component itself, the terminal post breaks before the explosion-proof valve, causing the explosion-proof valve to fail and reducing the reliability of the battery cell.

[0074] This application provides a battery cell comprising a terminal post, an electrode assembly, a housing, and a fixing member. The terminal post and the electrode assembly are electrically connected. The electrode assembly is disposed within the housing, which has a first wall, and the terminal post is disposed on the first wall. The fixing member comprises a first planar portion, a transition portion, and a second planar portion, the transition portion being located between the first and second planar portions. The first planar portion engages with the terminal post, and the second planar portion is connected to the first wall. At least one of the following thicknesses—the thickness of the first planar portion along the axial direction of the terminal post, the thickness of the second planar portion along the axial direction of the terminal post, and the thickness of the transition portion along a direction perpendicular to the axial direction of the terminal post—is greater than 0.8 mm and less than or equal to 1.5 mm. By increasing the thickness of at least one of the following: the thickness of the first planar portion along the axial direction of the electrode post; the thickness of the second planar portion along the axial direction of the electrode post; and the thickness of the transition portion in the direction perpendicular to the axial direction of the electrode post, to be greater than 0.8 mm and less than 1.5 mm, at least one of the first planar portion, the transition portion, and the second planar portion is thickened. Correspondingly, the strength of the fixing member itself is also enhanced, and the possibility of the fixing member breaking is reduced. On this basis, the risk of the electrode post breaking before the explosion-proof valve is reduced, which may lead to the failure of the explosion-proof valve, thereby improving the reliability of the battery cell.

[0075] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0076] Reference Figure 1 , Figure 2 and Figure 3 This application provides a battery cell 1, which includes a terminal post 12, an electrode assembly, a housing 11, and a fixing member 13, wherein the terminal post 12 and the electrode assembly are electrically connected; based on this, and referring to... Figure 4 , Figure 5 and Figure 6 The electrode assembly is disposed within the housing 11, which has a first wall 111, and the electrode post is disposed on the first wall 111. The fixing member 13 includes a first planar portion 131, a transition portion 133, and a second planar portion 132. The transition portion 133 is located between the first planar portion 131 and the second planar portion 132. The first planar portion 131 is engaged with the electrode post 12, and the second planar portion 132 is connected to the first wall 111. The thickness of the first planar portion 131 along the axial direction of the electrode post 12, the thickness of the second planar portion 132 along the axial direction of the electrode post 12, and the thickness of the transition portion 133 in the direction perpendicular to the axial direction of the electrode post 12 are all greater than 0.8 mm and less than or equal to 1.5 mm.

[0077] In this embodiment of the application, the battery cell 1 can be a secondary battery. A secondary battery refers to a battery cell 1 that can continue to be used after being discharged by recharging to activate the active materials.

[0078] In this embodiment, the battery cell 1 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. This embodiment does not limit the types of batteries.

[0079] In this embodiment, the battery cell 1 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic battery cells, such as hexagonal prismatic battery cells. This embodiment does not limit the specific shape of the battery cell.

[0080] In this embodiment, the pole post 12 can also be called an electrode terminal. The electrode terminal is electrically connected to the electrode assembly. The electrode terminal can be directly connected to the electrode assembly or indirectly connected to the electrode assembly through the adapter 15. This embodiment does not limit this.

[0081] In this embodiment, the electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell 1, active ions (e.g., lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator is disposed between the positive and negative electrodes to prevent short circuits between them while allowing active ions to pass through.

[0082] In this embodiment of the application, the electrode assembly may further include tabs. Here, the pole 12 is connected to the tabs in the electrode assembly. There may be two poles 12, and the two poles 12 are electrically connected to the positive and negative tabs in the electrode assembly respectively. Alternatively, there may be one pole 12, and one pole 12 is electrically connected to the positive and negative tabs in the electrode assembly simultaneously. This embodiment of the application does not limit this.

[0083] In this embodiment, the battery cell 1 further includes a housing 11, which is used to encapsulate the electrode assembly and electrolyte, etc. The housing 11 can be a rigid housing, an aluminum housing, a plastic housing (such as a polypropylene housing), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film, etc.

[0084] In this embodiment, the housing 11 can be integrally formed or separately formed. If the housing 11 is separately formed, it can include a lower housing 11 and an upper end cover. The upper end cover is fastened to the lower housing 11 to form a receiving cavity, and the electrode assembly is disposed in the receiving cavity. Of course, the electrode post 12 is disposed on the first wall 111. Here, the first wall 111 can be the first wall 111 on the upper end cover or the first wall 111 on the lower housing 11. This embodiment does not limit the specific type of wall.

[0085] In this embodiment, the second planar portion 132 is fixed to the first wall 111. This fixing can be non-removable, such as by welding or adhesive bonding. Alternatively, it can be detachable, such as by threaded connection or snap-fit ​​connection. This embodiment does not impose any limitations on this method. In one possible implementation provided by this embodiment, the second planar portion 132 is fixed to the first wall 111 by welding.

[0086] In this embodiment, the fastener 13 includes a first planar portion 131, a transition portion 133, and a second planar portion 132. The transition portion 133 is located between the first planar portion 131 and the second planar portion 132, meaning that the fastener 13 has a ring-shaped structure. The first planar portion forms the outer ring of the ring-shaped structure, the transition portion 133 forms the middle ring of the ring-shaped structure, and the second planar portion 132 forms the inner ring of the ring-shaped structure.

[0087] In this embodiment, the thickness of the first planar portion 131 along the axial direction of the pole post 12 is denoted as L1; the thickness of the second planar portion 132 along the axial direction of the pole post 12 is denoted as L2; ​​and the thickness of the transition portion 133 along the direction perpendicular to the axial direction of the pole post 12 is denoted as L3.

[0088] In this embodiment, the thickness of the first planar portion 131 along the axial direction of the pole post 12, the thickness of the second planar portion 132 along the axial direction of the pole post 12, and the thickness of the transition portion 133 in the direction perpendicular to the axial direction of the pole post can be measured by placing the fixing member 13 on a reference surface and then measuring the thickness of the three portions using a measuring tool, such as a vernier caliper. For example, when measuring the thickness of the first planar portion 131 along the axial direction of the pole post 12, the vernier caliper is attached to the side of the first planar portion 131 near the first wall 111 and the side away from the first wall 111. Here, it should be further noted that measuring the thickness of the first planar portion 131 along the axial direction of the pole post 12 should refer to the thickness of the section with the largest thickness among all sections along the axial direction of the pole post 12.

[0089] In this embodiment, at least one of the following thicknesses—the thickness of the first planar portion 131 along the axial direction of the pole post 12, the thickness of the second planar portion 132 along the axial direction of the pole post 12, and the thickness of the transition portion 133 along the direction perpendicular to the axial direction of the pole post 12—is greater than 0.8 mm and less than or equal to 1.5 mm. This can be: only the thickness of the first planar portion 131 along the axial direction of the pole post 12 is greater than 0.8 mm and less than or equal to 1.5 mm; only the thickness of the second planar portion 132 along the axial direction of the pole post 12 is greater than 0.8 mm and less than or equal to 1.5 mm; only the thickness of the transition portion 133 along the direction perpendicular to the axial direction of the pole post 12 is greater than 0.8 mm and less than or equal to 1.5 mm; or the thickness of the first planar portion 131 along the axial direction of the pole post 12, the thickness of the second planar portion 132 along the axial direction of the pole post 12, and the thickness of the transition portion 133 along the direction perpendicular to the axial direction of the pole post 12 are all greater than 0.8 mm and less than or equal to 1.5 mm. The thickness of the first planar portion 131 along the axial direction of the pole post 12 is greater than 0.8 mm and less than or equal to 1.5 mm; or the thickness of the first planar portion 131 along the axial direction of the pole post 12 and the thickness of the transition portion 133 in the direction perpendicular to the axial direction of the pole post 12 are both greater than 0.8 mm and less than or equal to 1.5 mm, or the thickness of the second planar portion 132 along the axial direction of the pole post 12 and the thickness of the transition portion 133 in the direction perpendicular to the axial direction of the pole post 12 are both greater than 0.8 mm and less than or equal to 1.5 mm; or the thickness of the first planar portion 131 along the axial direction of the pole post 12, the thickness of the second planar portion 132 along the axial direction of the pole post 12, and the thickness of the transition portion 133 in the direction perpendicular to the axial direction of the pole post 12 are all greater than 0.8 mm and less than or equal to 1.5 mm.

[0090] In this embodiment of the application, the thickness of the first planar portion 131 along the axial direction of the electrode post 12, the thickness of the second planar portion 132 along the axial direction of the electrode post 12, and the thickness of the transition portion 133 along the direction perpendicular to the axial direction of the electrode post 12 are all greater than 0.8 mm and less than 1.5 mm. For example, in a specific embodiment, the thickness can be 0.9 mm, 1.0 mm, or 1.4 mm.

[0091] The battery cell 1 provided in this application has at least one thickness greater than 0.8 mm and less than 1.5 mm in the following areas: the thickness of the first planar portion 131 along the axial direction of the electrode post 12; the thickness of the second planar portion 132 along the axial direction of the electrode post 12; and the thickness of the transition portion 133 in the direction perpendicular to the axial direction of the electrode post 12. In contrast, in related technologies, the thicknesses of the first planar portion 131 along the axial direction of the electrode post 12, the second planar portion 132 along the axial direction of the electrode post 12, and the transition portion 133 in the direction perpendicular to the axial direction of the electrode post 12 are all less than 0.8 mm. Compared to related technologies, the battery cell 1 provided in this application achieves at least one thickness of greater than 0.8 mm and less than 1.5 mm for the first planar portion 131, the transition portion 133, and the second planar portion 132. Correspondingly, the strength of the fixing member 13 itself is also enhanced, reducing the possibility of the fixing member 13 breaking. On this basis, the risk of the electrode post 12 breaking before the explosion-proof valve 14 is reduced, leading to the failure of the explosion-proof valve 14, thereby improving the reliability of the battery cell 1.

[0092] Reference Figure 4 , Figure 5 and Figure 6 This application provides a battery cell 1, wherein the thickness of the first planar portion 131 along the axial direction of the electrode post 12, the thickness of the second planar portion 132 along the axial direction of the electrode post 12, and the thickness of the transition portion 133 along the direction perpendicular to the axial direction of the electrode post 12 are all greater than 0.8 mm and less than or equal to 1.5 mm.

[0093] In this embodiment, the thickness of the first planar portion 131 along the axial direction of the pole post 12, the thickness of the second planar portion 132 along the axial direction of the pole post 12, and the thickness of the transition portion 133 along the direction perpendicular to the axial direction of the pole post 12 are all greater than 0.8 mm and less than or equal to 1.5 mm. However, this embodiment does not limit the magnitude relationship between the thicknesses of the first planar portion 131 along the axial direction of the pole post 12, the second planar portion 132 along the axial direction of the pole post 12, and the transition portion 133 along the direction perpendicular to the axial direction of the pole post 12.

[0094] The battery cell 1 provided in this application embodiment further enhances the strength of the fixing member 13 by making the thickness of the first flat portion 131 along the axial direction of the pole post 12, the thickness of the second flat portion 132 along the axial direction of the pole post 12, and the thickness of the transition portion 133 along the direction perpendicular to the axial direction of the pole post 12 all greater than 0.8 mm and less than or equal to 1.5 mm. Correspondingly, it also further reduces the possibility of the fixing member 13 breaking.

[0095] Reference Figure 4 , Figure 5 and Figure 6 This application provides a battery cell 1, wherein the thickness of the first planar portion 131 along the axial direction of the electrode post 12, the thickness of the second planar portion 132 along the axial direction of the electrode post 12, and the thickness of the transition portion 133 in the vertical direction along the axial direction of the electrode post 12 are all the same.

[0096] In this application embodiment, "same thickness" means substantially the same, such as the thickness of both not exceeding an error threshold. In one example, this error threshold could be 0.1 mm, 0.3 mm, etc., and this application embodiment does not impose any limitations on this. In one possible implementation provided in this application embodiment, the error threshold is 0.3 mm.

[0097] In this embodiment of the application, the thickness of the first planar portion 131 along the axial direction of the pole post 12, the thickness of the second planar portion 132 along the axial direction of the pole post 12, and the thickness of the transition portion 133 in the vertical direction along the axial direction of the pole post 12 can all be 1.0 mm; can all be 0.8 mm; or can all be 1.2 mm.

[0098] The battery cell 1 provided in this application embodiment has the same thickness for the first planar portion 131 along the axial direction of the electrode post 12, the second planar portion 132 along the axial direction of the electrode post 12, and the transition portion 133 along the direction perpendicular to the axial direction of the electrode post 12. This improves the consistency of the fixing member 13's thickness and facilitates its manufacturing. It should be noted that the consistent thickness of the three parts can be achieved through stamping, which simply requires stamping plates of equal thickness.

[0099] Reference Figure 4 , Figure 5 and Figure 6 This application provides a battery cell 1, wherein the thickness of the second planar portion 132 along the axial direction of the electrode post 12 is greater than 0.8 mm and less than or equal to 1.5 mm, and the thickness of the first planar portion 131 along the axial direction of the electrode post 12 is equal to 0.8 mm.

[0100] In this embodiment, the thickness of the transition portion 133 in the direction perpendicular to the axial direction of the pole post 12 can be equal to the thickness of the first planar portion 131 in the axial direction of the pole post 12; the thickness of the transition portion 133 in the direction perpendicular to the axial direction of the pole post 12 can also be greater than 0.8 mm and less than or equal to 1.5 mm, and the thickness of the transition portion 133 in the direction perpendicular to the axial direction of the pole post 12 can also be the same as the thickness of the second planar portion 132 in the axial direction of the pole post 12.

[0101] The battery cell 1 provided in this application embodiment has a second planar portion 132 connected to the first wall 111. By making the thickness of the second planar portion 132 along the axial direction of the pole post 12 greater than 0.8 mm and less than or equal to 1.5 mm, the reliability of the connection between the second planar portion 132 and the first wall 111 is improved. The thickness of the first planar portion 131 along the axial direction of the pole post 12 is equal to 0.8 mm, that is, the first planar portion 131 is not thickened, so as to avoid the fastener 13 being too heavy, which would lead to the battery cell 1 being too heavy and not taking advantage of the lightweight design of the battery cell 1.

[0102] Reference Figure 4 , Figure 5 and Figure 6 This application provides a battery cell 1, wherein the thickness of the transition portion 133 in the direction perpendicular to the axial direction of the pole post 12 is the same as the thickness of the second planar portion 132 in the axial direction of the pole post 12.

[0103] In this embodiment, the thickness of the transition portion 133 in the direction perpendicular to the axial direction of the pole post 12 is the same as the thickness of the second planar portion 132 in the axial direction of the pole post 12. For example, if the thickness of the second planar portion 132 in the axial direction of the pole post 12 is 1.0 mm, then the thickness of the transition portion 133 in the direction perpendicular to the axial direction of the pole post 12 is also 1.0 mm.

[0104] The battery cell 1 provided in this application embodiment has the same thickness of the transition portion 133 in the direction perpendicular to the axial direction of the pole post 12 as the thickness of the second planar portion 132 in the axial direction of the pole post 12, and the transition portion 133 is located between the first planar portion 131 and the second planar portion 132, which further improves the reliability of the connection between the second planar portion 132 and the first wall 111.

[0105] Reference Figure 5 , Figure 6 and Figure 7 This application provides a battery cell 1 in which the ratio of the axial thickness of the first planar portion 131 along the pole post 12 to the axial thickness of the second planar portion 132 along the pole post 12 is greater than or equal to 0.4 and less than or equal to 0.9.

[0106] In this embodiment, the ratio of the axial thickness of the first planar portion 131 along the pole post 12 to the axial thickness of the second planar portion 132 along the pole post 12 is greater than or equal to 0.4 and less than or equal to 0.9. In some specific embodiments, the ratio can be 0.5, 0.7, or 0.8.

[0107] In one example, the first planar portion 131 has an axial thickness of 0.8 mm along the pole post 12, and the second planar portion 132 has an axial thickness of 1.3 mm along the pole post 12. The ratio of the axial thickness of the first planar portion 131 along the pole post 12 to the axial thickness of the second planar portion 132 along the pole post 12 is 0.6.

[0108] In another example, the first planar portion 131 has an axial thickness of 0.9 mm along the pole post 12, and the second planar portion 132 has an axial thickness of 1.2 mm along the pole post 12. The ratio of the axial thickness of the first planar portion 131 along the pole post 12 to the axial thickness of the second planar portion 132 along the pole post 12 is 0.75.

[0109] The battery cell 1 provided in this application embodiment reduces the phenomenon that the second flat portion 132 is too thick, thereby increasing the overall height of the battery, by making the ratio of the axial thickness of the first flat portion 131 along the pole post 12 to the axial thickness of the second flat portion 132 along the pole post 12 greater than or equal to 0.4. The ratio of the axial thickness of the first flat portion 131 along the pole post 12 to the axial thickness of the second flat portion 132 along the pole post 12 less than or equal to 0.9, thereby reducing the phenomenon that the second flat portion 132 is not strong enough and the connection strength between the second flat portion 132 and the first wall 111 is weak, thereby causing the pole post 12 to break before the explosion-proof valve 14.

[0110] Reference Figure 5 , Figure 6 and Figure 7 This application provides a battery cell 1 in which the ratio of the axial thickness of the first planar portion 131 along the pole post 12 to the axial thickness of the second planar portion 132 along the pole post 12 is greater than or equal to 0.5 and less than or equal to 0.85.

[0111] In this embodiment, the ratio of the axial thickness of the first planar portion 131 along the pole post 12 to the axial thickness of the second planar portion 132 along the pole post 12 is greater than or equal to 0.5 and less than or equal to 0.85. In some specific embodiments, the ratio can be 0.6, 0.7, or 0.8.

[0112] In one example, the first planar portion 131 has an axial thickness of 0.8 mm along the pole post 12, and the second planar portion 132 has an axial thickness of 1.3 mm along the pole post 12. The ratio of the axial thickness of the first planar portion 131 along the pole post 12 to the axial thickness of the second planar portion 132 along the pole post 12 is 0.6.

[0113] In another example, the first planar portion 131 has an axial thickness of 0.9 mm along the pole post 12, and the second planar portion 132 has an axial thickness of 1.2 mm along the pole post 12. The ratio of the axial thickness of the first planar portion 131 along the pole post 12 to the axial thickness of the second planar portion 132 along the pole post 12 is 0.75.

[0114] The battery cell 1 provided in this application embodiment further reduces the phenomenon that the second flat portion 132 is too thick, thereby increasing the overall height of the battery, by making the ratio of the axial thickness of the first flat portion 131 along the pole post 12 to the axial thickness of the second flat portion 132 along the pole post 12 greater than or equal to 0.5. The ratio of the axial thickness of the first flat portion 131 along the pole post 12 to the axial thickness of the second flat portion 132 along the pole post 12 less than or equal to 0.85, thereby further reducing the phenomenon that the second flat portion 132 is not strong enough and the connection strength between the second flat portion 132 and the first wall 111 is weak, thereby causing the pole post 12 to break before the explosion-proof valve 14.

[0115] Reference Figure 7 and Figure 8 This application provides a battery cell 1, in which a reinforcing protrusion 1333 is provided on the side of the transition portion 133 facing the terminal post 12. The thickness of the transition portion 133 in the direction perpendicular to the axial direction of the terminal post 12 is the thickness between the side of the reinforcing protrusion 1333 facing the terminal post 12 and the side of the transition portion 133 away from the terminal post 12. And / or, the reinforcing protrusion 1333 provided on the side of the transition portion 133 facing away from the terminal post 12 is provided. The thickness of the transition portion 133 in the direction perpendicular to the axial direction of the terminal post 12 is the thickness between the side of the transition portion 133 facing the terminal post 12 and the side of the reinforcing protrusion 1333 away from the terminal post 12. The thickness of the transition portion 133 in the direction perpendicular to the axial direction of the terminal post 12 is greater than 0.8 mm and less than or equal to 1.5 mm.

[0116] In this embodiment, the transition portion 133 may have only one reinforcing protrusion 1333 on the side facing closer to or further away from the pole post 12, or it may have multiple reinforcing protrusions 1333. This embodiment does not limit this. In one possible implementation provided by this embodiment, the transition portion 133 has eight reinforcing protrusions 1333 on the side facing closer to the pole post 12.

[0117] The battery cell 1 provided in this embodiment of the application has a reinforcing protrusion 1333 on the side of the transition portion 133 facing closer to the pole post 12 and / or a reinforcing protrusion 1333 on the side of the transition portion 133 facing away from the pole post 12. The thickness of the transition portion 133 in the direction perpendicular to the axial direction of the pole post 12 is greater than 0.8 mm and less than or equal to 1.5 mm. In other words, it is equivalent to thickening the transition portion 133 only at the position where the reinforcing protrusion 1333 is provided. This improves the strength of the transition portion 133 itself while reducing its weight, and does not increase the height of the fixing member 13 in the axial direction of the pole post 12.

[0118] Reference Figure 7 and Figure 8 This application provides a battery cell 1 with multiple reinforcing protrusions 1333 distributed circumferentially along the electrode post 12 on the transition portion 133.

[0119] In this embodiment, there are 8 reinforcing protrusions 1333. The 8 reinforcing protrusions 1333 are arranged in pairs as a group. The 4 groups of reinforcing protrusions 1333 are distributed on the transition portion 133 along the circumference of the pole post 12 and at a 90-degree interval between each other.

[0120] The battery cell 1 provided in this application embodiment further improves the strength of the fixing member 13 by distributing multiple reinforcing protrusions 1333 along the circumference of the pole post 12 on the transition portion 133.

[0121] Reference Figure 9 , Figure 10 and Figure 11 This application provides a battery cell 1. Along the direction perpendicular to the axial direction of the pole post 12, a weight reduction groove 1332 is provided on the side of the transition portion 133 away from the pole post 12, and a reinforcing protrusion 1333 is provided on the side of the transition portion 133 facing the pole post 12. The weight reduction groove 1332 and the reinforcing protrusion 1333 are opposite to each other.

[0122] In this embodiment, the reinforcing protrusion 1333 on the side of the transition portion 133 facing the pole post 12 can be formed by punching a weight-reducing groove 1332 on the side of the transition portion 133 away from the pole post 12; of course, the reinforcing protrusion 1333 can also be formed by injection molding, and this embodiment does not limit it.

[0123] The battery cell 1 provided in this application embodiment has a weight-reducing groove 1332 provided on the side of the transition portion 133 away from the pole post 12 in a direction perpendicular to the axis of the pole post 12, and a reinforcing protrusion 1333 provided on the side of the transition portion 133 facing the pole post 12. The weight-reducing groove 1332 is opposite to the reinforcing protrusion 1333. In this way, the strength of the transition portion 133 itself is improved without increasing the weight of the transition portion 133, which is beneficial to the lightweight design of the battery cell 1.

[0124] Reference Figure 9 , Figure 10 and Figure 11 This application provides a battery cell 1, which further includes an insulating member and a through hole 1331. The insulating member is located between the terminal post 12 and the fixing member 13 and is used to insulate the terminal post 12 from the fixing member 13. At least a portion of the insulating member is located on the hole wall of the through hole 1331. The through hole 1331 is located at the position of the transition portion 133 near the reinforcing protrusion 1333.

[0125] In this embodiment of the application, the insulating element can be formed by injection molding insulating material into the through hole 1331. In one example, the insulating material can be rubber.

[0126] In this embodiment, the insulating component is located between the terminal post 12 and the fixing component 13. In addition, the insulating component can also be located on the side of the fixing component 13 away from the terminal post 12. In this way, the fixing component 13 can be insulated from the outside world, thereby improving the safety of the battery cell 1.

[0127] The battery cell 1 provided in this application embodiment reduces the possibility of the transition portion 133 near the through hole 1331 being weaker and cracking preferentially at the through hole 1331 by setting the through hole 1331 near the reinforcing protrusion 1333 in the transition portion 133.

[0128] Reference Figure 9 , Figure 10 and Figure 11 This application provides a battery cell 1 with multiple reinforcing protrusions 1333 and through holes 1331 disposed between the multiple reinforcing protrusions 1333, and the multiple reinforcing protrusions 1333 are evenly distributed along the circumference of the through holes 1331.

[0129] In this embodiment of the application, there can be two reinforcing protrusions 1333, and the through hole 1331 is located between the two reinforcing protrusions 1333. The two reinforcing protrusions 1333 are evenly distributed at 180-degree intervals along the circumference of the through hole 1331.

[0130] The battery cell 1 provided in this application embodiment further reduces the possibility that the transition portion 133 is weaker near the through hole 1331 and that the transition portion 133 is more likely to break preferentially near the through hole 1331 by distributing the through hole 1331 between multiple reinforcing protrusions 1333 and distributing the multiple reinforcing protrusions 1333 evenly along the circumference of the through hole 1331.

[0131] Reference Figure 9 , Figure 10 and Figure 11 This application provides a battery cell 1 with multiple reinforcing protrusions 1333 and multiple through holes 1331, with each through hole 1331 corresponding to one of the multiple reinforcing protrusions 1333.

[0132] In this embodiment of the application, there are 4 reinforcing protrusions 1333 and 4 through holes 1331, with each of the 4 through holes 1331 corresponding to one of the 4 reinforcing protrusions 1333.

[0133] The battery cell 1 provided in this application embodiment further reduces the possibility that the transition portion 133 is weaker near the through hole 1331 and the transition portion 133 is more likely to break preferentially near the through hole 1331 by making multiple through holes 1331 correspond one-to-one with multiple reinforcing protrusions 1333.

[0134] Reference Figure 3 and Figure 4 This application provides a battery cell 1, in which the thickness of the first wall 111 along the axial direction of the electrode post 12 is greater than or equal to 1.5 mm and less than or equal to 3.0 mm.

[0135] In this embodiment of the application, the thickness of the first wall 111 is denoted as L4.

[0136] In this embodiment, measuring the thickness of the first wall 111 along the axial direction of the pole post 12 to be greater than or equal to 1.5 mm and less than or equal to 3.0 mm can be achieved by placing the housing 11 on a reference surface, cutting the housing 11 along the axial direction of the pole post 12, and then measuring the first wall 111 using a measuring tool, such as a vernier caliper. For example, when measuring the thickness of the first wall 111, the vernier caliper is attached to both the side of the first wall 111 facing away from the second flat portion 132 and the side close to the second flat portion 132. It should be noted that the measured thickness of the first wall 111 should refer to the thickness of the section with the largest thickness among all sections along the axial direction of the pole post 12.

[0137] In this embodiment of the application, the thickness of the first wall 111 along the axial direction of the pole post 12 can be 2.0 mm, 1.7 mm, or 2.3 mm.

[0138] The battery cell 1 provided in this application embodiment has a thickness of 1.5 mm and 3.0 mm along the axial direction of the electrode post 12. This reduces the possibility that the first wall 111 will separate from the shell 11 due to the first wall 111 being too thin, and thus the electrode post 12 will break before the explosion-proof valve 14. This reduces the failure of the explosion-proof valve 14 and improves the reliability of the battery cell 1.

[0139] Reference Figure 3 and Figure 4This application provides a battery cell 1, the first wall 111 includes a connecting portion 1111 and a non-connecting portion 1112, the connecting portion 1111 is welded to a second planar portion 132, along the axial direction of the pole post 12, the sum of the thickness of the second planar portion 132 and the thickness of the connecting portion 1111 is greater than the thickness of the non-connecting portion 1112.

[0140] In this embodiment of the application, the thickness of the first wall 111 is denoted as L4, the connecting part 1111 is denoted as L41, and the non-connecting part is denoted as L42.

[0141] In this embodiment, the thickness of the second planar portion 132 along the axial direction of the pole post 12 is 0.8 mm, the thickness of the connecting portion 1111 along the axial direction of the pole post 12 is 1.5 mm, and the thickness of the non-connecting portion 1112 along the axial direction of the pole post 12 is 2.0 mm.

[0142] In this embodiment of the application, the thickness of the second planar portion 132 along the axial direction of the pole post 12 is 1.0 mm, the thickness of the connecting portion 1111 along the axial direction of the pole post 12 is 1.2 mm, and the thickness of the non-connecting portion 1112 along the axial direction of the pole post 12 is 2.0 mm.

[0143] The battery cell 1 provided in this application embodiment has its thickness along the axial direction of the electrode post 12 such that the sum of the thickness of the second planar portion 132 and the thickness of the connecting portion 1111 is greater than the thickness of the non-connecting portion 1112. This can further improve the reliability of the welding between the first wall 111 and the second planar portion 132.

[0144] Reference Figure 3 and Figure 4 This application provides a battery cell 1 in which the thickness of the connecting portion 1111 is greater than the thickness of the non-connecting portion 1112 along the axial direction of the electrode post 12.

[0145] In this embodiment of the application, the thickness of the connecting part 1111 is 2.5mm, and the thickness of the non-connecting part 1112 is 2mm.

[0146] In this embodiment of the application, the thickness of the connecting portion 1111 is 2.3 mm, and the thickness of the non-connecting portion 1112 is 2 mm.

[0147] The battery cell 1 provided in this application embodiment has a thickness of the connecting portion 1111 greater than the thickness of the non-connecting portion 1112 along the axial direction of the electrode post 12. In other words, a boss is formed on the first wall 111, and the second flat portion 132 is welded to the boss. This makes it convenient for workers to weld.

[0148] Reference Figure 3 and Figure 4This application provides a battery cell 1, in which a groove 1111 is provided in the connecting portion 1111. Along the axial direction of the pole post 12, the depth of the groove 11111 is less than the thickness of the second flat portion 132. The sum of the thickness of the side of the groove 11111 close to the second flat portion 132 and the side of the groove 11111 away from the second flat portion 132 and the thickness of the second flat portion 132 is greater than the thickness of the non-connecting portion 1112.

[0149] In this embodiment of the application, the thickness of the first wall 111 is denoted as L4, the connecting portion 1111 is denoted as L41, the depth of the groove is denoted as L411, the depth of the groove 11111 is less than the thickness of the second planar portion 132, and the thickness between the side of the groove 11111 that is close to the second planar portion 132 and the side of the groove 11111 that is away from the second planar portion 132 is denoted as L412.

[0150] In this embodiment of the application, the depth of the groove 11111 along the axial direction of the pole post 12 is less than the thickness of the second flat portion 132. When the thickness of the second flat portion 132 along the axial direction of the pole post 12 is equal to 1.5mm, the depth of the groove 11111 along the axial direction of the pole post 12 should be less than 1.5mm.

[0151] In this embodiment, the sum of the thickness of the side of the groove 11111 near the second planar portion 132 and the side of the groove 11111 away from the second planar portion 132 and the thickness of the second planar portion 132 is greater than the thickness of the non-connecting portion 1112. For example, if the thickness of the non-connecting portion 1112 is 2mm, then the sum of the thickness of the side of the groove 11111 near the second planar portion 132 and the side of the groove 11111 away from the second planar portion 132 and the thickness of the second planar portion 132 is greater than 2mm.

[0152] The battery cell 1 provided in this application embodiment has a groove 11111 on the connecting part 1111. The depth of the groove 11111 is less than the thickness of the second flat part 132. In other words, a part of the second flat part 132 is located in the groove 11111. In this way, the overall height of the battery cell 1 can be reduced.

[0153] Reference Figure 3 and Figure 4 This application provides a battery cell 1, with a groove 11111 provided in the connecting portion 1111. Along the axial direction of the pole post 12, the depth of the groove 11111 is greater than the thickness of the second flat portion 132. The sum of the thickness between the side of the groove 11111 close to the second flat portion 132 and the side of the groove 11111 away from the second flat portion 132 and the thickness of the second flat portion 132 is greater than the thickness of the non-connecting portion 1112.

[0154] In this embodiment of the application, the depth of the groove 11111 along the axial direction of the pole post 12 is greater than the thickness of the second flat portion 132. For example, when the thickness of the second flat portion 132 along the axial direction of the pole post 12 is equal to 1.5mm, the depth of the groove 11111 along the axial direction of the pole post 12 should be greater than 1.5mm.

[0155] In this embodiment, the sum of the thickness of the side of the groove 11111 near the second planar portion 132 and the side of the groove 11111 away from the second planar portion 132 and the thickness of the second planar portion 132 is greater than the thickness of the non-connecting portion 1112. For example, if the thickness of the non-connecting portion 1112 is 2mm, then the sum of the thickness of the side of the groove 11111 near the second planar portion 132 and the side of the groove 11111 away from the second planar portion 132 and the thickness of the second planar portion 132 is greater than 2mm.

[0156] The battery cell 1 provided in this application embodiment has a groove 11111 on the connecting part 1111. The depth of the groove 11111 is greater than the thickness of the second flat part 132. In other words, the second flat part 132 is completely recessed in the groove 11111. In this way, the overall height of the battery cell 1 can be further reduced.

[0157] Reference Figure 3 and Figure 4 This application provides a battery cell 1 in which the welding depth of the second flat portion 132 and the groove 11111 along the axial direction of the electrode post 12 is less than or equal to the thickness of the second flat portion 132.

[0158] In this embodiment of the application, along the axial direction of the pole post 12, the welding depth between the second flat portion 132 and the groove 11111 is less than or equal to the thickness of the second flat portion 132. If the thickness of the second flat portion 132 along the axial direction of the pole post 12 is greater than 0.8 mm, then the welding depth between the second flat portion 132 and the groove 11111 should be less than or equal to 0.8 mm.

[0159] The battery cell 1 provided in this application embodiment improves the aesthetics of the battery cell 1 by making the welding depth between the second flat portion 132 and the groove 11111 less than or equal to the thickness of the second flat portion 132 along the axial direction of the electrode post 12. In other words, the welding material will not completely immerse the second flat portion 132.

[0160] This application provides a battery cell 1, wherein the gas production capacity of the battery cell 1 is greater than or equal to 0.25 MPa and less than or equal to 0.45 MPa.

[0161] In this embodiment of the application, the gas production of battery cell 1 is the sum of the gas generated during the charging and discharging of battery cell 1 throughout its entire life cycle and the gas stored inside battery cell 1. For example, if battery cell 1 can be charged and discharged 50 times, then the gas production of battery cell 1 is the sum of the gas generated during the charging and discharging of battery cell 1 50 times and the gas stored inside battery cell 1.

[0162] In this embodiment of the application, the battery cell 1 can be a ternary lithium battery, and the gas production capacity of the ternary lithium battery is greater than or equal to 0.25MPa and less than or equal to 0.45MPa.

[0163] In this embodiment of the application, the gas production of battery cell 1 can be 0.25MPa, 0.3MPa, or 0.4MPa.

[0164] In this embodiment, the gas production of battery cell 1 can be measured by directly connecting the sealing port of the battery cell 1 to be installed with the gas pressure gauge through a gas guide tube, and directly charging and discharging the battery cell 1 throughout its entire life cycle. At this time, the total amount of gas generated by the charging and discharging of the battery cell 1 throughout its entire life cycle and the total amount of gas stored inside the battery cell 1 are directly displayed by the gas pressure gauge.

[0165] This application provides a battery cell 1 with a terminal post 12 having a diameter greater than or equal to 18 mm and less than or equal to 36 mm.

[0166] In this embodiment, the diameter of the electrode post can be 20mm, 25mm, or 30mm.

[0167] In this embodiment, the diameter of the pole post 12 is denoted as L5.

[0168] In this embodiment, the pole post 12 is placed on a reference surface, and a vernier caliper measures the pole post 12 radially. For example, when measuring the diameter of the pole post 12, the vernier caliper is engaged on opposite sides of the pole post 12 radially. It should be noted that the diameter of the pole post 12 refers to the two sides furthest apart radially from each other.

[0169] This application provides a battery cell 1, which is a prismatic battery. The length of the prismatic battery is greater than or equal to 215 mm and less than or equal to 500 mm, and the width is greater than or equal to 45 mm and less than or equal to 120 mm.

[0170] In this embodiment, the length of the battery cell 1 can be 215mm and the width can be 50mm; the length of the battery cell 1 can also be 300mm and the width can also be 80mm.

[0171] The length of battery cell 1 is denoted as L6, and the width is denoted as L7.

[0172] In this embodiment, the length and width of the battery cell 1 can be measured by placing the battery cell 1 on a reference surface and using a measuring tool, such as a vernier caliper, to measure the two sides that are opposite each other along the length direction of the battery cell 1 and the two sides that are opposite each other along the width direction of the battery cell 1. Here, it should be noted that the length of the battery cell 1 should refer to the two sides that are farthest apart along the length direction of the battery cell 1, and similarly, the width of the battery cell 1 should refer to the two sides that are farthest apart along the width direction of the battery cell 1.

[0173] This application provides a battery device, which includes a plurality of battery cells 1 provided in this application embodiment.

[0174] In this embodiment, the battery device may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells 1, which are connected in series, parallel, or mixed connections via a busbar.

[0175] In this embodiment of the application, the battery device can be a battery pack, which includes a housing and one or more individual battery cells housed in the housing.

[0176] In this embodiment, the housing may include a first housing and a second housing. The first housing and the second housing are fastened together to form a closed space inside the housing for housing the individual battery cells. Here, "closed" refers to covering or shutting down, and can be either sealed or unsealed. The first housing may be a top cover or a bottom plate.

[0177] In this embodiment, the housing may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that the interior of the housing forms a closed space to accommodate individual battery cells.

[0178] In this embodiment, the housing can be part of the vehicle's chassis structure. For example, the housing's top cover 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.

[0179] In this embodiment, 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.

[0180] This application provides an electrical device, including at least one battery device provided in this application for providing electrical energy.

[0181] In this embodiment of the application, the electrical equipment can be a mobile phone, portable device, laptop computer, electric vehicle, electric toy, power tool, vehicle, ship and spacecraft, etc. The spacecraft can include airplane, rocket, space shuttle and spacecraft, etc.

[0182] This application embodiment also provides a specific technical solution: the thickness of the second planar portion 132 along the axial direction of the pole post 12 is greater than the thickness of the first planar portion 131 along the axial direction of the pole post 12, which is equivalent to thickening the side of the fixing member 13 near the first wall 111; furthermore, the thickness of the transition portion 133 along the axial direction of the pole post 12 is equal to the thickness of the second planar portion 132 along the axial direction of the pole post 12 or equal to the thickness of the first planar portion 131 along the axial direction of the pole post 12. When the thickness of the transition portion 133 along the axial direction of the pole post 12 is equal to the thickness of the second planar portion 132 along the axial direction of the pole post 12, it is equivalent to thickening the side of the fixing member 13 near the first wall 111 and also thickening the side of the fixing member 13 facing the pole post 12. When the axial thickness of the fastener 13 is equal to the axial thickness of the first planar portion 131 along the pole post 12, it is equivalent to thickening only the side of the fastener 13 near the first wall 111. Furthermore, the ratio of the axial thickness of the first planar portion 131 along the pole post 12 to the axial thickness of the second planar portion 132 along the pole post 12 is greater than or equal to 0.4 and less than or equal to 0.9, preferably greater than or equal to 0.5 and less than or equal to 0.85. Furthermore, if the fastener 13 is welded to the first wall 111, the weld penetration depth of the fastener 13 to the first wall 111 should be less than or equal to the axial thickness of the second planar portion 132 along the pole post 12. Since the axial thickness of the second planar portion 132 along the pole post 12 is increased, the penetration depth is increased accordingly, the welding strength is increased, and thus the strength of the pole post 12 is improved.

[0183] This application embodiment also provides a specific technical solution. The fixing member 13 is provided with a through hole 1331, and a reinforcing protrusion 1333 is also provided on the fixing member 13. The reinforcing protrusion 1333 is located around the through hole 1331. For example, the reinforcing protrusion 1333 can be a reinforcing rib. Further, the number of reinforcing protrusions 1333 is greater than or equal to the number of through holes 1331. Further still, both the through hole 1331 and the reinforcing protrusion 1333 are provided at the transition portion 133 to avoid the risk of the fixing member 13 and the pole post 12 becoming connected due to the addition of reinforcing protrusions 1333 to the first flat portion 131. Further still, a stamping process can be considered, in which the side of the transition portion 133 away from the pole post 12 is concave, and the side of the transition portion 133 close to the pole post 12 is convex to form the reinforcing protrusion 1333. In this way, the weight of the fixing member 13 can be increased, and the strength of the pole post 12 can be improved without affecting the height of the pole post 12.

[0184] The above embodiments are merely illustrative of the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein.

Claims

1. A battery cell, characterized by, The application relates to a battery pole, comprising: a pole column; an electrode assembly, the pole column and the electrode assembly being electrically connected; a housing, the electrode assembly being arranged in the housing, the housing having a first wall, the pole column being arranged on the first wall; a fixing member, the fixing member comprising a first planar portion, a transition portion and a second planar portion, the transition portion being located between the first planar portion and the second planar portion, the first planar portion being clamped with the pole column, and the second planar portion being connected with the first wall; at least one of the thickness of the first planar portion along the axial direction of the pole column, the thickness of the second planar portion along the axial direction of the pole column and the thickness of the transition portion along the direction perpendicular to the axial direction of the pole column is greater than 0.8 mm and less than or equal to 1.5 mm.

2. The battery cell of claim 1, wherein, all of the thickness of the first planar portion along the axial direction of the pole column, the thickness of the second planar portion along the axial direction of the pole column and the thickness of the transition portion along the direction perpendicular to the axial direction of the pole column are greater than 0.8 mm and less than or equal to 1.5 mm.

3. The battery cell of claim 2, wherein, the thickness of the first planar portion along the axial direction of the pole column, the thickness of the second planar portion along the axial direction of the pole column and the thickness of the transition portion along the direction perpendicular to the axial direction of the pole column are the same.

4. The battery cell of claim 1, wherein, the thickness of the second planar portion along the axial direction of the pole column is greater than 0.8 mm and less than or equal to 1.5 mm, and the thickness of the first planar portion along the axial direction of the pole column is equal to 0.8 mm.

5. The battery cell of claim 4, wherein, the thickness of the transition portion along the direction perpendicular to the axial direction of the pole column is the same as the thickness of the second planar portion along the axial direction of the pole column.

6. The battery cell according to claim 4 or 5, characterized in that the ratio of the thickness of the first planar portion along the axial direction of the pole column to the thickness of the second planar portion along the axial direction of the pole column is greater than or equal to 0.4 and less than or equal to 0.

9.

7. The battery cell of claim 6, wherein, the ratio of the thickness of the first planar portion along the axial direction of the pole column to the thickness of the second planar portion along the axial direction of the pole column is greater than or equal to 0.5 and less than or equal to 0.

85.

8. The battery cell of any one of claims 1 to 7, wherein, the transition portion is provided with a reinforcing protrusion close to the pole column, and the thickness of the transition portion along the direction perpendicular to the axial direction of the pole column is the thickness between the side of the reinforcing protrusion close to the pole column and the side of the transition portion away from the pole column along the direction perpendicular to the axial direction of the pole column, and / or the transition portion is provided with a reinforcing protrusion away from the pole column, and the thickness of the transition portion along the direction perpendicular to the axial direction of the pole column is the thickness between the side of the transition portion close to the pole column and the side of the reinforcing protrusion away from the pole column along the direction perpendicular to the axial direction of the pole column, and the thickness of the transition portion along the direction perpendicular to the axial direction of the pole column is greater than 0.8 mm and less than or equal to 1.5 mm.

9. The battery cell of claim 8, wherein, the reinforcing protrusions are multiple, and the multiple reinforcing protrusions are distributed on the transition portion along the circumferential direction of the pole column.

10. The battery cell of claim 8, wherein, in the direction perpendicular to the axial direction of the pole column, the side of the transition portion away from the pole column is provided with a lightening groove, the reinforcing protrusion is arranged on the side of the transition portion close to the pole column, and the lightening groove is opposite to the reinforcing protrusion.

11. The battery cell of claim 8, wherein, The battery cell further comprises an insulation piece and a through hole, the insulation piece is located between the pole and the fixing piece for insulating the pole from the fixing piece, and at least part of the insulation piece is located on the hole wall of the through hole, and the through hole is arranged at the transition portion close to the reinforcing protrusion.

12. The battery cell of claim 11, wherein, The reinforcing protrusions are multiple, the through hole is arranged between the multiple reinforcing protrusions, and the multiple reinforcing protrusions are uniformly distributed along the circumference of the through hole.

13. The battery cell of claim 11, wherein, The reinforcing protrusions are multiple, and the through holes are multiple, and the multiple through holes correspond to the multiple reinforcing protrusions one by one.

14. The battery cell of any one of claims 1 to 13, wherein, In the axial direction of the pole, the thickness of the first wall is greater than or equal to 1.5 mm and less than or equal to 3.0 mm.

15. The battery cell of any one of claims 1 to 14, wherein, The first wall comprises a connecting portion and a non-connecting portion, the connecting portion is welded with the second planar portion, and the sum of the thickness of the second planar portion and the thickness of the connecting portion is greater than the thickness of the non-connecting portion in the axial direction of the pole.

16. The battery cell of claim 15, wherein, In the axial direction of the pole, the thickness of the connecting portion is greater than the thickness of the non-connecting portion.

17. The battery cell of claim 15, wherein, The connecting portion is provided with a groove, and the depth of the groove is less than the thickness of the second planar portion in the axial direction of the pole, and the sum of the thickness between the side of the groove close to the second planar portion and the side of the groove away from the second planar portion and the thickness of the second planar portion is greater than the thickness of the non-connecting portion.

18. The battery cell of claim 15, wherein, The connecting portion is provided with a groove, and the depth of the groove is greater than the thickness of the second planar portion in the axial direction of the pole, and the sum of the thickness between the side of the groove close to the second planar portion and the side of the groove away from the second planar portion and the thickness of the second planar portion is greater than the thickness of the non-connecting portion.

19. The battery cell of claim 17 or 18, wherein, In the axial direction of the pole, the welding depth of the second planar portion and the groove is less than or equal to the thickness of the second planar portion.

20. The battery cell of any one of claims 1-19, wherein, The battery cell has a gas production greater than or equal to 0.25 MPa and less than or equal to 0.45 MPa.

21. The battery cell of any one of claims 1-20, wherein, The diameter of the pole is greater than or equal to 18 mm and less than or equal to 36 mm.

22. A battery device, characterized by Comprise: A plurality of battery cells according to any one of claims 1 to 21.

23. An electrical device, comprising: Comprise: At least one battery device according to claim 22 for providing electrical energy.

Images