Battery cell, battery device and electric apparatus

Abstract

Disclosed in the present disclosure are a battery cell, a battery device and an electric apparatus. The present disclosure relates to the technical field of batteries. The battery cell comprises a terminal post, an electrode assembly and a fixing member, wherein the electrode assembly is electrically connected to the terminal post and is disposed within a casing; the casing 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 is located between the first planar portion and the second planar portion; the first planar portion is snap-fitted with the terminal post, and the second planar portion is connected to the first wall; and at least one of the thickness of the second planar portion in the axial direction of the terminal post and the thickness of at least part of the transition portion in a direction perpendicular to the axial direction of the terminal post is greater than the thickness of the first planar portion in the axial direction of the terminal post.

Description

Battery cell, battery device and electric equipment

[0001] Cross-reference to related applications

[0002] The present disclosure is based on and claims priority to Chinese Patent Application No. 202411258835.7, filed on September 9, 2024, entitled "Battery cell, battery device and electric equipment", the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present disclosure relates to the technical field of batteries, and in particular to a battery cell, a battery device and an electric equipment. BACKGROUND

[0004] New energy batteries are increasingly widely used in life and industry. For example, new energy vehicles equipped with batteries have been widely used.

[0005] In the related art, the pole in the battery cell is clamped with the fixing member, and the pole is also connected with the shell through the fixing member. However, due to the defects of the fixing member, the reliability of the battery cell is weak. SUMMARY

[0006] The present disclosure provides a battery cell, a battery and an electric equipment, which has the technical effect of strengthening the strength of the fixing member except for the clamping part of the pole, thereby improving the strength of the pole, reducing the risk of the pole breaking before the explosion-proof valve, and improving the reliability of the battery cell.

[0007] In a first aspect, the present disclosure provides a battery cell, comprising a pole, an electrode assembly, a shell and a fixing member, wherein the electrode assembly is electrically connected with the pole; the electrode assembly is arranged in the shell, and the shell has a first wall, and the pole is arranged on the first wall; the fixing member comprises a first planar part, a transition part and a second planar part, the transition part is located between the first planar part and the second planar part, the first planar part is clamped with the pole, and the second planar part is connected with the first wall; at least one of the thickness of the second planar part along the axial direction of the pole and the thickness of the transition part along the direction perpendicular to the axial direction of the pole is greater than the thickness of the first planar part along the axial direction of the pole.

[0008] The battery cell provided by the present disclosure has the advantages that the thickness of the second flat part along the axial direction of the pole is greater than the thickness of the first flat part along the axial direction of the pole, and the thickness of the transition part at least partially along the direction perpendicular to the axial direction of the pole is greater than the thickness of the first flat part along the axial direction of the pole, so that the strength of at least one of the second flat part and the transition part is weaker than that in the prior art, and the second flat part and the transition part are prone to breakage. Compared with the prior art, the thickness of at least one of the second flat part and the transition part is increased, in other words, the thickness is increased, and correspondingly, the strength of at least one of the second flat part and the transition part is also increased, and the strength of the fixing part except the first flat part is also increased correspondingly, so that the possibility of breakage is reduced, and the risk of the pole breaking before the explosion-proof valve is reduced, the possibility of the explosion-proof valve failure is reduced, and the reliability of the battery cell is improved.

[0009] In an implementation provided by the present disclosure, the thickness of the second flat part along the axial direction of the pole is greater than the thickness of the first flat part along the axial direction of the pole, and the ratio of the thickness of the first flat part along the axial direction of the pole to the thickness of the second flat part along the axial direction of the pole is greater than or equal to 0.4 and less than or equal to 0.9.

[0010] The battery cell provided by the present disclosure has the advantages that the thickness of the second flat part along the axial direction of the pole is greater than the thickness of the first flat part along the axial direction of the pole, and the thickness of the transition part at least partially along the direction perpendicular to the axial direction of the pole is greater than the thickness of the first flat part along the axial direction of the pole, so that the strength of at least one of the second flat part and the transition part is weaker than that in the prior art, and the second flat part and the transition part are prone to breakage. Compared with the prior art, the thickness of at least one of the second flat part and the transition part is increased, in other words, the thickness is increased, and correspondingly, the strength of at least one of the second flat part and the transition part is also increased, and the strength of the fixing part except the first flat part is also increased correspondingly, so that the possibility of breakage is reduced, and the risk of the pole breaking before the explosion-proof valve is reduced, the possibility of the explosion-proof valve failure is reduced, and the reliability of the battery cell is improved.

[0011] In an implementation provided by the present disclosure, the ratio of the thickness of the first flat part along the axial direction of the pole to the thickness of the second flat part along the axial direction of the pole is greater than or equal to 0.5 and less than or equal to 0.85.

[0012] The battery cell provided by the present disclosure has the advantages that the thickness of the second flat part along the axial direction of the pole is greater than the thickness of the first flat part along the axial direction of the pole, and the thickness of the transition part at least partially along the direction perpendicular to the axial direction of the pole is greater than the thickness of the first flat part along the axial direction of the pole, so that the strength of at least one of the second flat part and the transition part is weaker than that in the prior art, and the second flat part and the transition part are prone to breakage. Compared with the prior art, the thickness of at least one of the second flat part and the transition part is increased, in other words, the thickness is increased, and correspondingly, the strength of at least one of the second flat part and the transition part is also increased, and the strength of the fixing part except the first flat part is also increased correspondingly, so that the possibility of breakage is reduced, and the risk of the pole breaking before the explosion-proof valve is reduced, the possibility of the explosion-proof valve failure is reduced, and the reliability of the battery cell is improved.

[0013] In an implementation provided by the present disclosure, the thickness of the transition part at least partially along the direction perpendicular to the axial direction of the pole is equal to the thickness of the second flat part along the axial direction of the pole.

[0014] The battery cell provided by the present disclosure further enhances the strength of the fixing part except the first flat part by making the thickness of the transition part along the direction perpendicular to the axial direction of the pole equal to the thickness of the second flat part along the axial direction of the pole, and correspondingly, further reduces the possibility of damage of the fixing part.

[0015] In an implementation provided by the present disclosure, the thickness of the transition part along the direction perpendicular to the axial direction of the pole is equal to the thickness of the first flat part along the axial direction of the pole.

[0016] The battery cell provided by the present disclosure only enhances the thickness of the second flat part along the axial direction of the pole by making the thickness of the transition part along the direction perpendicular to the axial direction of the pole equal to the thickness of the first flat part along the axial direction of the pole, avoids the fixing part being too heavy, and further causes the battery cell to be too heavy, which is not conducive to the lightweight design of the battery cell.

[0017] In an implementation provided by the present disclosure, the side of the transition part close to the pole or the side of the transition part away from the pole is provided with a reinforcing protrusion, and the thickness of the transition part corresponding to the position provided with the reinforcing protrusion along the direction perpendicular to the axial direction of the pole is greater than the thickness of the first flat part along the axial direction of the pole.

[0018] The battery cell provided by the present disclosure reduces the weight of the transition part while improving the strength of the transition part by providing the side of the transition part close to the pole or the side of the transition part away from the pole with a reinforcing protrusion, and the thickness of the transition part corresponding to the position provided with the reinforcing protrusion along the direction perpendicular to the axial direction of the pole is greater than the thickness of the first flat part along the axial direction of the pole, in other words, the position of the transition part provided with the reinforcing protrusion is thickened.

[0019] In an implementation provided by the present disclosure, the reinforcing protrusions are multiple, and the multiple reinforcing protrusions are distributed on the transition part along the circumferential direction of the pole.

[0020] The battery cell provided by the present disclosure further improves the strength of the fixing part by making the multiple reinforcing protrusions distributed on the transition part along the circumferential direction of the pole.

[0021] In an implementation provided by the present disclosure, along the direction perpendicular to the axial direction of the pole, the side of the transition part away from the pole is provided with a weight-reducing groove, and the reinforcing protrusion is arranged on the side of the transition part facing the pole, and the weight-reducing groove is opposite to the reinforcing protrusion.

[0022] The battery cell provided by the present disclosure reduces the weight of the transition part while improving the strength of the transition part by making the side of the transition part away from the pole provided with a weight-reducing groove along the direction perpendicular to the axial direction of the pole, and the reinforcing protrusion is arranged on the side of the transition part facing the pole, and the weight-reducing groove is opposite to the reinforcing protrusion.

[0023] In an implementation provided by the present disclosure, the battery cell further comprises an insulating piece and a through hole, the insulating piece is located between the pole column and the fixing piece, and is used for insulating the pole column and the fixing piece, and at least part of the insulating piece is located on the hole wall of the through hole, and the through hole is arranged at the position of the transition part close to the reinforcing protrusion.

[0024] The battery cell provided by the present disclosure reduces the possibility that the transition part close to the through hole is preferentially broken by arranging the through hole at the position of the transition part close to the reinforcing protrusion.

[0025] In an implementation provided by the present disclosure, the reinforcing protrusion is a plurality of reinforcing protrusions, the through hole is arranged between the plurality of reinforcing protrusions, and the plurality of reinforcing protrusions are uniformly distributed along the circumference of the through hole.

[0026] The battery cell provided by the present disclosure further reduces the possibility that the transition part close to the through hole is preferentially broken by arranging the through hole between the plurality of reinforcing protrusions and uniformly distributing the plurality of reinforcing protrusions along the circumference of the through hole.

[0027] In an implementation provided by the present disclosure, the reinforcing protrusion is a plurality of reinforcing protrusions, and the through hole is a plurality of through holes, the plurality of through holes correspond to the plurality of reinforcing protrusions one by one.

[0028] The battery cell provided by the present disclosure further reduces the possibility that the transition part close to the through hole is preferentially broken by arranging the plurality of through holes to correspond to the plurality of reinforcing protrusions one by one.

[0029] In an implementation provided by the present disclosure, along the axial direction of the pole column, the thickness of the first wall is greater than 1.5 mm and less than or equal to 3.0 mm.

[0030] The battery cell provided by the present disclosure reduces the possibility that the first wall is separated from the shell due to the first wall being too thin, and the pole column is preferentially broken before the explosion-proof valve, thereby reducing the phenomenon of failure of the explosion-proof valve, by arranging the thickness of the first wall to be greater than or equal to 1.5 mm and less than or equal to 3.0 mm along the axial direction of the pole column.

[0031] In an implementation provided by the present disclosure, 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 along the axial direction of the pole column.

[0032] The battery cell provided by the present disclosure further improves the reliability of welding the first wall with the second planar portion by arranging the sum of the thickness of the second planar portion and the thickness of the connecting portion to be greater than the thickness of the non-connecting portion along the axial direction of the pole column.

[0033] In an implementation provided by the present disclosure, along the axial direction of the pole column, the thickness of the connecting portion is greater than the thickness of the non-connecting portion.

[0034] The battery cell provided by the present disclosure, along the axial direction of the pole column, by making the thickness of the connecting portion greater than the thickness of the non-connecting portion, in other words, the boss is formed on the first wall, and the second planar portion is welded with the boss, so that the worker can be conveniently welded.

[0035] In an implementation provided by the present disclosure, the connecting portion is provided with a groove, along the axial direction of the pole column, the depth of the groove is less than the thickness of the second planar portion, 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.

[0036] The battery cell provided by the present disclosure, by providing the connecting portion with a groove, the depth of the groove is less than the thickness of the second planar portion, in other words, part of the second planar portion is located in the groove, so that the height of the battery cell as a whole can be reduced.

[0037] In an implementation provided by the present disclosure, the connecting portion is provided with a groove, along the axial direction of the pole column, the depth of the groove is greater than the thickness of the second planar portion, 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.

[0038] The battery cell provided by the present disclosure, by providing the connecting portion with a groove, the depth of the groove is greater than the thickness of the second planar portion, in other words, the second planar portion is completely recessed in the groove, so that the height of the battery cell as a whole can be further reduced.

[0039] In an implementation provided by the present disclosure, along the axial direction of the pole column, the welding depth of the second planar portion and the groove is less than or equal to the thickness of the second planar portion.

[0040] The battery cell provided by the present disclosure, along the axial direction of the pole column, by making the welding depth of the second planar portion and the groove less than or equal to the thickness of the second planar portion, in other words, the welding material does not completely immerse the second planar portion, which is conducive to improving the appearance of the battery cell.

[0041] In an implementation provided by the present disclosure, the battery cell has a gas production greater than or equal to 0.25 MPa and less than or equal to 0.45 MPa.

[0042] In an implementation provided by the present disclosure, the diameter of the pole column is greater than or equal to 18 mm and less than or equal to 36 mm.

[0043] In a second aspect, the present disclosure provides a battery device, which comprises a plurality of battery cells provided by any one of the first aspect.

[0044] The battery device provided by the present disclosure has the same technical effects as the plurality of battery monomers provided by any one of the first aspect, i.e., the strength of the fixing member except the joint part with the pole is enhanced, the strength of the pole is further improved, the risk of the pole breaking before the explosion-proof valve is reduced, and the reliability of the battery monomer is further improved.

[0045] In a third aspect, the present disclosure provides a power utilization device comprising at least one battery device provided by any one of the second aspect for providing electric energy.

[0046] The power utilization device provided by the present disclosure has the same technical effects as the battery device provided by any one of the second aspect for providing electric energy, and the battery device comprises the plurality of battery monomers provided by any one of the first aspect, i.e., the strength of the fixing member except the joint part with the pole is enhanced, the strength of the pole is further improved, the risk of the pole breaking before the explosion-proof valve is reduced, and the reliability of the battery monomer is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0047] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of preferred embodiments, and are not intended to limit the present disclosure. Moreover, like reference numerals in the drawings denote like elements. In the drawings:

[0048] FIG. 1 is a first perspective view of a battery monomer according to an embodiment of the present disclosure;

[0049] FIG. 2 is a second perspective view of a battery monomer according to an embodiment of the present disclosure;

[0050] FIG. 3 is a cross-sectional view of a battery monomer according to an embodiment of the present disclosure;

[0051] FIG. 4 is an enlarged view of A in FIG. 3 according to an embodiment of the present disclosure;

[0052] FIG. 5 is an exploded view of a fixing member provided with a reinforcing protrusion on the side close to the pole, a portion of an insulating member, and a pole according to an embodiment of the present disclosure;

[0053] FIG. 6 is a structural view of the fixing member provided with a reinforcing protrusion on the side close to the pole in FIG. 5 according to an embodiment of the present disclosure;

[0054] FIG. 7 is a cross-sectional view of the fixing member in FIG. 6 according to an embodiment of the present disclosure;

[0055] FIG. 8 is a bottom view of the fixing member in FIG. 6 according to an embodiment of the present disclosure;

[0056] FIG. 9 is an exploded schematic view of a fixing member, a portion of an insulating member, and a pole provided with a lightening groove on a side facing away from the pole and a reinforcing protrusion on a side facing the pole according to an embodiment of the present disclosure;

[0057] FIG. 10 is a structural schematic view of the fixing member of FIG. 9 according to an embodiment of the present disclosure;

[0058] FIG. 11 is a bottom view of the fixing member of FIG. 9 according to an embodiment of the present disclosure.

[0059] BRIEF DESCRIPTION OF THE DRAWINGS 1 - battery cell; 11 - housing; 111 - first wall; 1111 - connecting portion; 11111 - recess; 1112 - non-connecting portion; 12 - pole; 13 - fixing member; 131 - first planar portion; 132 - second planar portion; 133 - transition portion; 1331 - through hole; 1332 - lightening groove; 1333 - reinforcing protrusion; 14 - explosion-proof valve; 15 - adapter; 16 - insulating member. DETAILED DESCRIPTION

[0060] Embodiments of the technical solutions of the present disclosure will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present disclosure, and therefore only serve as examples, and cannot limit the protection scope of the present disclosure.

[0061] 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 disclosure belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure; the terms "include" and "have" and any variations thereof in the specification and in the claims and the above description of drawings are intended to cover the inclusion not the exclusion of one or more elements.

[0062] In the description of the embodiments of the present disclosure, the technical terms "first", "second", "third" and the like are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the technical features indicated. In the description of the embodiments of the present disclosure, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0063] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present disclosure. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0064] In the description of the embodiments of the disclosure, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are "or" relationship.

[0065] In the description of the embodiments of the disclosure, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the embodiments of the disclosure and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed, operated or used in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the disclosure.

[0066] In the description of the embodiments of the disclosure, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the disclosure can be understood according to the specific circumstances.

[0067] In the description of the embodiments of the disclosure, unless otherwise explicitly specified and limited, the technical term "contact" should be understood in a broad sense, which can be direct contact or contact through an intermediate medium layer, which can be contact between two objects in contact without interaction force, or contact between two objects in contact with interaction force.

[0068] At present, new energy batteries are more and more widely used in life and industry, for example, new energy vehicles equipped with batteries have been widely used.

[0069] In the related art, the pole in the battery monomer is clamped with the fixing piece, and the pole is also connected with the shell through the fixing piece, but due to the design of the fixing piece itself, the strength of the rest of the fixing piece is low, the fixing piece is damaged, the pole is broken earlier than the explosion-proof valve, the explosion-proof valve is invalid, and the reliability of the battery monomer is reduced.

[0070] The battery monomer provided by the present disclosure comprises a pole, an electrode assembly, a shell and a fixing piece, wherein the electrode assembly is electrically connected with the pole; the electrode assembly is arranged in the shell, the shell has a first wall, and the pole is arranged on the first wall; the fixing piece comprises a first planar part, a transition part and a second planar part, the transition part is located between the first planar part and the second planar part, the first planar part is clamped with the pole, and the second planar part is connected with the first wall; at least one of the thickness of the second planar part along the axial direction of the pole and the thickness of the transition part at least partially along the direction perpendicular to the axial direction of the pole is greater than the thickness of the first planar part along the axial direction of the pole. At least one of the second planar part and the transition part at least partially is thickened, in other words, the thickness is increased, and correspondingly, at least one of the second planar part and the transition part at least partially is also enhanced, the strength of the fixing piece except the first planar part is also enhanced correspondingly, and the possibility of damage is reduced. On this basis, the risk of the pole breaking before the explosion-proof valve is reduced, the possibility of the explosion-proof valve failure is reduced, and the reliability of the battery monomer is improved.

[0071] In the following, the present disclosure will be described in detail.

[0072] Referring to FIGS. 1, 2 and 3, the present disclosure provides a battery monomer 1 comprising a pole 12, an electrode assembly, a shell 11 and a fixing piece 13, wherein the electrode assembly is electrically connected with the pole 12; on this basis, and referring to FIGS. 4, 5 and 6, the electrode assembly is arranged in the shell 11, the shell 11 has a first wall 111, and the pole is arranged on the first wall 111; the fixing piece 13 comprises a first planar part 131, a transition part 133 and a second planar part 132, the transition part 133 is located between the first planar part 131 and the second planar part 132, the first planar part 131 is clamped with the pole 12, and the second planar part 132 is connected with the first wall 111; at least one of the thickness of the second planar part 132 along the axial direction of the pole 12 and the thickness of the transition part 133 at least partially along the direction perpendicular to the axial direction of the pole 12 is greater than the thickness of the first planar part 131 along the axial direction of the pole 12.

[0073] In the present disclosure, the battery monomer 1 can be a secondary battery, which refers to a battery monomer 1 that is discharged and then activated by charging to continue to be used.

[0074] In the present disclosure, the battery monomer 1 can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel chromium battery, a lead-acid battery, etc., and the present disclosure is not limited thereto.

[0075] In the embodiments of the present disclosure, the battery monomer 1 can be a cylindrical battery monomer, a prismatic battery monomer, a soft package battery monomer or other shaped battery monomer, and the prismatic battery monomer includes a square battery monomer, a blade-shaped battery monomer, a multi-prismatic battery monomer, such as a hexagonal battery monomer, and the like, and the embodiments of the present disclosure are not limited thereto.

[0076] In the embodiments of the present disclosure, the pole column 12 can also be referred to as an electrode terminal, the electrode terminal is electrically connected with the electrode assembly, and the electrode terminal can be directly connected with the electrode assembly or indirectly connected with the electrode assembly through the adapter 15, and the embodiments of the present disclosure are not limited thereto.

[0077] In the embodiments of the present disclosure, the electrode assembly includes a positive electrode, a negative electrode and a separator. In the charging and discharging process of the battery monomer 1, active ions (such as lithium ions) are embedded and extracted between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short-circuiting and allow the active ions to pass through.

[0078] In the embodiments of the present disclosure, the electrode assembly can further include a tab, and here, the pole column 12 is connected with the tab in the electrode assembly, the pole column 12 can be two, and the two pole columns 12 are respectively and correspondingly electrically connected with the positive and negative tabs in the electrode assembly, or the pole column 12 can be one, and the one pole column 12 is electrically connected with the positive and negative tabs in the electrode assembly, and the embodiments of the present disclosure are not limited thereto.

[0079] In the embodiments of the present disclosure, the battery monomer 1 further includes a shell 11, and the shell 11 is used for packaging the electrode assembly and the electrolyte and the like. The shell 11 can be a rigid shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell) or an aluminum-plastic film and the like.

[0080] In the embodiments of the present disclosure, the shell 11 can be integrally formed or separately formed, for example, the shell 11 is separately formed, and the shell 11 can include a lower shell 11 and an upper end cover, and the upper end cover is buckled on the lower shell 11 to form a containing cavity, and the electrode assembly is arranged in the containing cavity. Of course, the pole column 12 is arranged on the first wall 111, and here, the first wall 111 can be a first wall 111 on the upper end cover or a first wall 111 on the lower shell 11, and the embodiments of the present disclosure are not limited thereto.

[0081] In the embodiments of the present disclosure, the second planar part 132 is fixed with the first wall 111, and here, the second planar part 132 can be fixed with the first wall 111 in a non-detachable manner, such as welding, gluing and the like, and of course, the second planar part 132 can also be fixed with the first wall 111 in a detachable manner, such as threaded connection, buckle connection and the like, and the embodiments of the present disclosure are not limited thereto. In an implementation manner provided by the embodiments of the present disclosure, the second planar part 132 is fixed with the first wall 111 by welding.

[0082] In the embodiments of the present disclosure, the fixing member 13 comprises 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, which means that the fixing member 13 is a ring structure, the first planar portion 131 forms an outer ring of the ring structure, the transition portion 133 forms a middle ring of the ring structure, and the second planar portion 132 forms an inner ring of the ring structure.

[0083] In the embodiments of the present disclosure, the thickness of the first planar portion 131 along the axial direction of the pole 12 is denoted as L1, the thickness of the second planar portion 132 along the axial direction of the pole 12 is denoted as L2, and the thickness of the transition portion 133 along the direction perpendicular to the axial direction of the pole 12 is denoted as L3.

[0084] In the embodiments of the present disclosure, the thickness of the first planar portion 131 along the axial direction of the pole 12, the thickness of the second planar portion 132 along the axial direction of the pole 12, and the thickness of the transition portion 133 along the direction perpendicular to the axial direction of the pole can be measured by placing the fixing member 13 on a reference surface and then measuring the thicknesses of the three portions with a measuring tool, such as a vernier caliper. For example, to measure the thickness of the first planar portion 131 along the axial direction of the pole 12, the vernier caliper is clamped on the side of the first planar portion 131 close to the first wall 111 and the side away from the first wall 111. It should be noted that the thickness of the first planar portion 131 along the axial direction of the pole 12 refers to the thickness of the section with the largest thickness in all sections along the axial direction of the pole 12.

[0085] In the embodiments of the present disclosure, at least one of the thickness of the second planar portion 132 along the axial direction of the pole 12 and the thickness of the transition portion 133 along the direction perpendicular to the axial direction of the pole 12 is greater than the thickness of the first planar portion 131 along the axial direction of the pole 12. For example, only the thickness of the second planar portion 132 along the axial direction of the pole 12 is greater than the thickness of the first planar portion 131 along the axial direction of the pole 12; or only the thickness of the transition portion 133 along the direction perpendicular to the axial direction of the pole 12 is greater than the thickness of the first planar portion 131 along the axial direction of the pole 12; or both the thickness of the second planar portion 132 along the axial direction of the pole 12 and the thickness of the transition portion 133 along the direction perpendicular to the axial direction of the pole 12 are greater than the thickness of the first planar portion 131 along the axial direction of the pole 12. It should be noted that when both the thickness of the second planar portion 132 along the axial direction of the pole 12 and the thickness of the transition portion 133 along the direction perpendicular to the axial direction of the pole 12 are greater than the thickness of the first planar portion 131 along the axial direction of the pole 12, the present disclosure does not limit the size between the two thicknesses.

[0086] In the embodiments of the present disclosure, if the thickness of at least part of the transition portion 133 in the direction perpendicular to the axial direction of the pole column 12 is greater than the thickness of the first flat portion 131 in the axial direction of the pole column 12, the thickness of the entire transition portion 133 in the direction perpendicular to the axial direction of the pole column 12 can be greater than the thickness of the first flat portion 131 in the axial direction of the pole column 12; or the thickness of part of the transition portion 133 in the direction perpendicular to the axial direction of the pole column 12 can be greater than the thickness of the first flat portion 131 in the axial direction of the pole column 12, and the thickness of another part of the transition portion 133 in the direction perpendicular to the axial direction of the pole column 12 can be equal to the thickness of the first flat portion 131 in the axial direction of the pole column 12.

[0087] In the embodiments of the present disclosure, at least one of the thickness of the second flat portion 132 in the axial direction of the pole column 12 and the thickness of at least part of the transition portion 133 in the direction perpendicular to the axial direction of the pole column 12 is greater than the thickness of the first flat portion 131 in the axial direction of the pole column 12, while in the related art, at least one of the second flat portion 132 and the transition portion 133 is weak in strength and is prone to damage. Compared with the related art, the present disclosure thickens at least one of the second flat portion 132 and at least part of the transition portion 133, in other words, the thickness is increased, and correspondingly, at least one of the second flat portion 132 and at least part of the transition portion 133 is also correspondingly strengthened, and the strength of the other parts of the fixing member 13 except the first flat portion 131 is also correspondingly strengthened, and the possibility of damage is reduced. On this basis, the risk of the pole column 12 breaking before the explosion-proof valve 14 is reduced, the possibility of the explosion-proof valve 14 failing is reduced, and the reliability of the battery monomer 1 is improved.

[0088] Referring to FIGS. 5, 6 and 7, the present disclosure provides a battery monomer 1, the thickness of the second flat portion 132 in the axial direction of the pole column 12 is greater than the thickness of the first flat portion 131 in the axial direction of the pole column 12, and the ratio of the thickness of the first flat portion 131 in the axial direction of the pole column 12 to the thickness of the second flat portion 132 in the axial direction of the pole column 12 is greater than or equal to 0.4 and less than or equal to 0.9.

[0089] In the embodiments of the present disclosure, the ratio of the thickness of the first flat portion 131 in the axial direction of the pole column 12 to the thickness of the second flat portion 132 in the axial direction of the pole column 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, the ratio can be 0.7, and the ratio can be 0.8.

[0090] In an example, the thickness of the first flat portion 131 in the axial direction of the pole column 12 is 0.8 mm, and the thickness of the second flat portion 132 in the axial direction of the pole column 12 is 1.3 mm. The ratio of the thickness of the first flat portion 131 in the axial direction of the pole column 12 to the thickness of the second flat portion 132 in the axial direction of the pole column 12 is 0.6.

[0091] In another example, the first flat portion 131 has an axial thickness along the pole 12 of 0.9 mm, and the second flat portion 132 has an axial thickness along the pole 12 of 1.2 mm. The ratio of the axial thickness of the first flat portion 131 to the axial thickness of the second flat portion 132 along the pole 12 is 0.75.

[0092] The battery cell 1 provided by the embodiments of the present disclosure reduces the phenomenon of the second flat portion 132 being too thick and increasing the overall height of the battery by making the ratio of the axial thickness of the first flat portion 131 to the axial thickness of the second flat portion 132 along the pole 12 greater than or equal to 0.4. The ratio of the axial thickness of the first flat portion 131 to the axial thickness of the second flat portion 132 along the pole 12 is less than or equal to 0.9 to reduce the phenomenon of the second flat portion 132 not being strong enough and the second flat portion 132 and the first wall 111 not being connected strongly enough, so that the pole 12 breaks before the explosion-proof valve 14.

[0093] Referring to FIGS. 5, 6, and 7, the embodiments of the present disclosure provide a battery cell 1, in which the ratio of the axial thickness of the first flat portion 131 to the axial thickness of the second flat portion 132 along the pole 12 is greater than or equal to 0.5 and less than or equal to 0.85.

[0094] In the embodiments of the present disclosure, the ratio of the axial thickness of the first flat portion 131 to the axial thickness of the second flat portion 132 along the pole 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, the ratio can be 0.7, and the ratio can be 0.8.

[0095] In an example, the first flat portion 131 has an axial thickness along the pole 12 of 0.8 mm, and the second flat portion 132 has an axial thickness along the pole 12 of 1.3 mm. The ratio of the axial thickness of the first flat portion 131 to the axial thickness of the second flat portion 132 along the pole 12 is 0.6.

[0096] In another example, the first flat portion 131 has an axial thickness along the pole 12 of 0.9 mm, and the second flat portion 132 has an axial thickness along the pole 12 of 1.2 mm. The ratio of the axial thickness of the first flat portion 131 to the axial thickness of the second flat portion 132 along the pole 12 is 0.75.

[0097] The battery monomer 1 provided by the embodiment of the present disclosure further reduces the phenomenon of the second planar part 132 being too thick and increasing the overall height of the battery by making the ratio of the axial thickness of the first planar part 131 along the pole column 12 to the axial thickness of the second planar part 132 along the pole column 12 greater than or equal to 0.5, and further reduces the phenomenon of the second planar part 132 being insufficient in strength, the second planar part 132 being weak in connection strength with the first wall 111, and thus the pole column 12 being broken before the explosion-proof valve 14 by making the ratio of the axial thickness of the first planar part 131 along the pole column 12 to the axial thickness of the second planar part 132 along the pole column 12 less than or equal to 0.85.

[0098] Referring to FIGS. 5, 6 and 7, the embodiment of the present disclosure provides a battery monomer 1, the thickness of the transition part 133 at least partially along a direction perpendicular to the axial direction of the pole column 12 is equal to the thickness of the second planar part 132 along the axial direction of the pole column 12.

[0099] In the embodiment of the present disclosure, the thickness being the same means being substantially the same, for example, the thicknesses of the two are not more than an error threshold value, which may, in an example, be 0.1 mm, which may be 0.3 mm, and the like, and the embodiment of the present disclosure does not limit this. In an implementable manner provided by the embodiment of the present disclosure, the error threshold value is 0.3 mm.

[0100] In the embodiment of the present disclosure, the thickness of the transition part 133 at least partially along a direction perpendicular to the axial direction of the pole column 12 is the same as the thickness of the second planar part 132 along the axial direction of the pole column 12, for example, the thickness of the second planar part 132 along the axial direction of the pole column 12 is 1.0 mm, and the thickness of the transition part 133 at least partially along a direction perpendicular to the axial direction of the pole column 12 is also 1.0 mm.

[0101] The battery monomer 1 provided by the embodiment of the present disclosure further enhances the strength of the remaining parts of the fixing part 13 except the first planar part 131 by making the thickness of the transition part 133 at least partially along a direction perpendicular to the axial direction of the pole column 12 equal to the thickness of the second planar part 132 along the axial direction of the pole column 12, and correspondingly, further reduces the possibility of damage to the fixing part 13.

[0102] Referring to FIGS. 5, 6 and 7, the embodiment of the present disclosure provides a battery monomer 1, the thickness of the transition part 133 at least partially along a direction perpendicular to the axial direction of the pole column 12 is equal to the thickness of the first planar part 131 along the axial direction of the pole column 12.

[0103] In the embodiment of the present disclosure, the thickness of the transition part 133 at least partially along a direction perpendicular to the axial direction of the pole column 12 is equal to the thickness of the first planar part 131 along the axial direction of the pole column 12, for example, the thickness of the first planar part 131 along the axial direction of the pole column 12 is 0.8 mm, and the thickness of the transition part 133 at least partially along a direction perpendicular to the axial direction of the pole column 12 is also 0.8 mm.

[0104] The battery monomer 1 provided by the embodiment of the present disclosure avoids the fixing member 13 being too heavy, and further avoids the battery monomer 1 being too heavy, which is not conducive to the lightweight design of the battery monomer 1.

[0105] Referring to FIGS. 7 and 8, the embodiment of the present disclosure provides a battery monomer 1, the transition part 133 is provided with a reinforcing protrusion 1333 on the side close to or away from the pole column 12, and the thickness of the transition part 133 corresponding to the position where the reinforcing protrusion 1333 is arranged is greater than the thickness of the first planar part 131 along the axial direction of the pole column 12.

[0106] In the embodiment of the present disclosure, the side of the transition part 133 close to or away from the pole column 12 can be provided with only one reinforcing protrusion 1333, or can be provided with a plurality of reinforcing protrusions 1333, and the embodiment of the present disclosure does not limit this. In an implementation manner provided by the embodiment of the present disclosure, eight reinforcing protrusions 1333 are arranged on the side of the transition part 133 close to the pole column 12.

[0107] The battery monomer 1 provided by the embodiment of the present disclosure is provided with the reinforcing protrusion 1333 on the side of the transition part 133 close to or away from the pole column 12, and the thickness of the transition part 133 corresponding to the position where the reinforcing protrusion 1333 is arranged is greater than the thickness of the first planar part 131 along the axial direction of the pole column 12, in other words, the position of the transition part 133 where the reinforcing protrusion 1333 is arranged is thickened, which improves the strength of the transition part 133 itself while reducing the weight of the transition part 133 itself.

[0108] Referring to FIGS. 7 and 8, the embodiment of the present disclosure provides a battery monomer 1, the reinforcing protrusion 1333 is a plurality of reinforcing protrusions 1333, and the plurality of reinforcing protrusions 1333 are distributed on the transition part 133 along the circumferential direction of the pole column 12.

[0109] In the embodiment of the present disclosure, the reinforcing protrusion 1333 is eight reinforcing protrusions 1333, and the eight reinforcing protrusions 1333 are each a group of two, and the four groups of reinforcing protrusions 1333 are distributed on the transition part 133 along the circumferential direction of the pole column 12 and spaced 90 degrees apart from each other.

[0110] The battery monomer 1 provided by the embodiment of the present disclosure is provided with the plurality of reinforcing protrusions 1333 distributed on the transition part 133 along the circumferential direction of the pole column 12, which further improves the strength of the fixing member 13 itself.

[0111] Referring to FIGS. 9, 10 and 11, the battery monomer 1 provided by the embodiment of the present disclosure is provided with a lightening groove 1332 on the side of the transition part 133 away from the pole column 12 in the direction perpendicular to the axial direction of the pole column 12, and a reinforcing protrusion 1333 is arranged on the side of the transition part 133 facing the pole column 12, and the lightening groove 1332 is opposite to the reinforcing protrusion 1333.

[0112] In the embodiment of the present disclosure, the reinforcing protrusion 1333 on the side of the transition part 133 facing the pole column 12 can be formed by punching the lightening groove 1332 on the side of the transition part 133 away from the pole column 12; of course, the reinforcing protrusion 1333 can also be formed by injection molding, and the embodiment of the present disclosure does not limit this.

[0113] The battery monomer 1 provided by the embodiment of the present disclosure is provided with a lightening groove 1332 on the side of the transition part 133 away from the pole column 12 in the direction perpendicular to the axial direction of the pole column 12, and a reinforcing protrusion 1333 is arranged on the side of the transition part 133 facing the pole column 12, and the lightening groove 1332 is opposite to the reinforcing protrusion 1333, so that the strength of the transition part 133 itself is improved while the weight of the transition part 133 is not increased, which is conducive to the lightweight design of the battery monomer 1.

[0114] Referring to FIGS. 9, 10 and 11, the battery monomer 1 provided by the embodiment of the present disclosure further comprises an insulating part and a through hole 1331, the insulating part is located between the pole column 12 and the fixing part 13, and is used for insulating the pole column 12 and the fixing part 13, and at least part of the insulating part is located on the hole wall of the through hole 1331, and the through hole 1331 is arranged at the position of the transition part 133 close to the reinforcing protrusion 1333.

[0115] In the embodiment of the present disclosure, the insulating part can be formed by injecting insulating material into the through hole 1331, and in an example, the insulating material can be rubber.

[0116] In the embodiment of the present disclosure, the insulating part is located between the pole column 12 and the fixing part 13, and on this basis, the insulating part can also be located on the side of the fixing part 13 away from the pole column 12, so that the fixing part 13 can be insulated from the outside, and the safety of the battery monomer 1 is improved.

[0117] The battery monomer 1 provided by the embodiment of the present disclosure is provided with a lightening groove 1332 on the side of the transition part 133 away from the pole column 12 in the direction perpendicular to the axial direction of the pole column 12, and a reinforcing protrusion 1333 is arranged on the side of the transition part 133 facing the pole column 12, and the lightening groove 1332 is opposite to the reinforcing protrusion 1333, so that the strength of the transition part 133 itself is improved while the weight of the transition part 133 is not increased, which is conducive to the lightweight design of the battery monomer 1.

[0118] Referring to FIGS. 9, 10 and 11, the battery monomer 1 provided by the embodiment of the present disclosure is provided with a lightening groove 1332 on the side of the transition part 133 away from the pole column 12 in the direction perpendicular to the axial direction of the pole column 12, and a reinforcing protrusion 1333 is arranged on the side of the transition part 133 facing the pole column 12, and the lightening groove 1332 is opposite to the reinforcing protrusion 1333, so that the strength of the transition part 133 itself is improved while the weight of the transition part 133 is not increased, which is conducive to the lightweight design of the battery monomer 1.

[0119] In the embodiments of the present disclosure, the reinforcing protrusions 1333 can be two, the through hole 1331 is located between the two reinforcing protrusions 1333, and the two reinforcing protrusions 1333 are uniformly distributed at intervals of 180 degrees along the circumference of the through hole 1331.

[0120] The battery monomer 1 provided by the embodiments of the present disclosure further reduces the possibility that the transition part 133 near the through hole 1331 is weak in strength and preferentially ruptures by arranging the through hole 1331 between the plurality of reinforcing protrusions 1333 and uniformly distributing the plurality of reinforcing protrusions 1333 along the circumference of the through hole 1331.

[0121] Referring to FIGS. 9, 10 and 11, the embodiments of the present disclosure provide a battery monomer 1, the reinforcing protrusions 1333 are a plurality of, the through holes 1331 are a plurality of, and the plurality of through holes 1331 correspond one-to-one to the plurality of reinforcing protrusions 1333.

[0122] In the embodiments of the present disclosure, the reinforcing protrusions 1333 are four, the through holes 1331 are also four, and the four through holes 1331 correspond one-to-one to the four reinforcing protrusions 1333.

[0123] The battery monomer 1 provided by the embodiments of the present disclosure further reduces the possibility that the transition part 133 near the through hole 1331 is weak in strength and preferentially ruptures by arranging the plurality of through holes 1331 to correspond one-to-one to the plurality of reinforcing protrusions 1333.

[0124] Referring to FIGS. 3 and 4, the embodiments of the present disclosure provide a battery monomer 1, the thickness of the first wall 111 is greater than 1.5 mm and less than or equal to 3.0 mm along the axial direction of the pole column 12.

[0125] In the embodiments of the present disclosure, the thickness of the first wall 111 is represented as L4.

[0126] In the embodiments of the present disclosure, the thickness of the first wall 111 can be greater than or equal to 1.5 mm and less than or equal to 3.0 mm along the axial direction of the pole column 12. The measurement can be that the shell 11 is placed on a reference surface, the shell 11 is cut along the axial direction of the pole column 12, and then a measuring tool such as a vernier caliper is used to measure the first wall. For example, to measure the thickness of the first wall 111, the vernier caliper is clamped on the first wall 111 on the side away from the second planar part 132 and on the side close to the second planar part 132. It should be noted that the thickness of the first wall 111 should refer to the thickness of the largest cross section in all cross sections along the axial direction of the pole column 12.

[0127] In the embodiments of the present disclosure, the thickness of the first wall 111 can be 2.0 mm, 1.7 mm or 2.3 mm along the axial direction of the pole column 12.

[0128] The battery monomer 1 provided by the embodiment of the present disclosure reduces the possibility that the first wall 111 is separated from the shell 11 due to the first wall 111 being too thin, and that the pole column 12 is broken before the explosion-proof valve 14, thereby reducing the failure of the explosion-proof valve 14, and improving the reliability of the battery monomer 1.

[0129] Referring to FIGS. 3 and 4, the embodiment of the present disclosure provides a battery monomer 1, the first wall 111 includes a connecting portion 1111 and a non-connecting portion 1112, the connecting portion 1111 is welded with the second planar portion 132, and the sum of the thickness of the second planar portion 132 and the thickness of the non-connecting portion 1112 is greater than the thickness of the non-connecting portion 1112 along the axial direction of the pole column 12.

[0130] In the embodiment of the present disclosure, the thickness of the first wall 111 is represented as L4, the connecting portion 1111 is represented as L41, and the non-connecting portion is represented as L42.

[0131] In the embodiment of the present disclosure, the thickness of the second planar portion 132 along the axial direction of the pole column 12 is 0.8 mm, the thickness of the connecting portion 1111 along the axial direction of the pole column 12 is 1.5 mm, and the thickness of the non-connecting portion 1112 along the axial direction of the pole column 12 is 2.0 mm.

[0132] In the embodiment of the present disclosure, the thickness of the second planar portion 132 along the axial direction of the pole column 12 is 1.0 mm, the thickness of the connecting portion 1111 along the axial direction of the pole column 12 is 1.2 mm, and the thickness of the non-connecting portion 1112 along the axial direction of the pole column 12 is 2.0 mm.

[0133] The battery monomer 1 provided by the embodiment of the present disclosure reduces the possibility that the first wall 111 is separated from the shell 11 due to the first wall 111 being too thin, and that the pole column 12 is broken before the explosion-proof valve 14, thereby reducing the failure of the explosion-proof valve 14, and improving the reliability of the battery monomer 1.

[0134] Referring to FIGS. 3 and 4, the embodiment of the present disclosure provides a battery monomer 1, the thickness of the connecting portion 1111 is greater than the thickness of the non-connecting portion 1112 along the axial direction of the pole column 12.

[0135] In the embodiment of the present disclosure, the thickness of the connecting portion 1111 is 2.5 mm, and the thickness of the non-connecting portion 1112 is 2 mm.

[0136] In the embodiment of the present disclosure, the thickness of the connecting portion 1111 is 2.3 mm, and the thickness of the non-connecting portion 1112 is 2 mm.

[0137] The battery monomer 1 provided by the embodiment of the present disclosure, along the axial direction of the pole column 12, by making the thickness of the connecting portion 1111 greater than the thickness of the non-connecting portion 1112, in other words, the first wall 111 is formed with a boss, and the second flat portion 132 is welded with the boss, so that the worker can be welded conveniently.

[0138] Referring to FIGS. 3 and 4, the embodiment of the present disclosure provides a battery monomer 1, the connecting portion 1111 is provided with a groove 11111, along the axial direction of the pole column 12, the depth of the groove 11111 is less than the thickness of the second flat portion 132, and 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 is greater than the thickness of the non-connecting portion 1112.

[0139] In the embodiment of the present disclosure, the thickness of the first wall 111 is represented as L4, the connecting portion 1111 is represented as L41, and the depth of the groove is represented as L411. The depth of the groove 11111 is less than the thickness of the second flat portion 132, and 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 is represented as L412.

[0140] In the embodiment of the present disclosure, along the axial direction of the pole column 12, the depth of the groove 11111 is less than the thickness of the second flat portion 132, and when the thickness of the second flat portion 132 along the axial direction of the pole column 12 is equal to 1.5 mm, the depth of the groove 11111 along the axial direction of the pole column 12 should be less than 1.5 mm.

[0141] In the embodiment of the present disclosure, 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 is greater than the thickness of the non-connecting portion 1112, for example, when the thickness of the non-connecting portion 1112 is 2 mm, 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 is greater than 2 mm.

[0142] The battery monomer 1 provided by the embodiment of the present disclosure, by providing the groove 11111 on the connecting portion 1111, the depth of the groove 11111 is less than the thickness of the second flat portion 132, in other words, part of the second flat portion 132 is located in the groove 11111, so that the overall height of the battery monomer 1 can be reduced.

[0143] With reference to FIGS. 3 and 4, the battery cell 1 provided by the embodiment of the present disclosure has the connecting portion 1111 provided with the groove 11111, and the depth of the groove 11111 is greater than the thickness of the second flat portion 132 along the axial direction of the pole 12. 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 is greater than the thickness of the non-connecting portion 1112.

[0144] In the embodiment of the present disclosure, the depth of the groove 11111 is greater than the thickness of the second flat portion 132 along the axial direction of the pole 12. For example, when the thickness of the second flat portion 132 along the axial direction of the pole 12 is equal to 1.5 mm, the depth of the groove 11111 should be greater than 1.5 mm along the axial direction of the pole 12.

[0145] In the embodiment of the present disclosure, 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 is greater than the thickness of the non-connecting portion 1112. For example, when the thickness of the non-connecting portion 1112 is 2 mm, 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 should be greater than 2 mm.

[0146] The battery cell 1 provided by the embodiment of the present disclosure has the connecting portion 1111 provided with the groove 11111, and the depth of the groove 11111 is greater than the thickness of the second flat portion 132. In other words, the second flat portion 132 is completely recessed in the groove 11111. In this way, the overall height of the battery cell 1 can be further reduced.

[0147] With reference to FIGS. 3 and 4, the battery cell 1 provided by the embodiment of the present disclosure has the second flat portion 132 and the groove 11111, and the welding depth of the second flat portion 132 and the groove 11111 is less than or equal to the thickness of the second flat portion 132 along the axial direction of the pole 12.

[0148] In the embodiment of the present disclosure, the welding depth of the second flat portion 132 and the groove 11111 is less than or equal to the thickness of the second flat portion 132 along the axial direction of the pole 12. For example, when the thickness of the second flat portion 132 along the axial direction of the pole 12 is greater than 0.8 mm, the welding depth of the second flat portion 132 and the groove 11111 should be less than or equal to 0.8 mm.

[0149] The battery cell 1 provided by the embodiment of the present disclosure has the second flat portion 132 and the groove 11111, and the welding depth of the second flat portion 132 and the groove 11111 is less than or equal to the thickness of the second flat portion 132 along the axial direction of the pole 12. In other words, the welding material does not completely immerse the second flat portion 132, which is conducive to improving the appearance of the battery cell 1.

[0150] The battery monomer 1 provided by the embodiment of the present disclosure has a gas production amount greater than or equal to 0.25 MPa and less than or equal to 0.45 MPa.

[0151] In the embodiment of the present disclosure, the gas production amount of the battery monomer 1 is the sum of the gas generated by charging and discharging in the whole life cycle of the battery monomer 1 and the gas stored in the battery monomer 1. For example, if the battery monomer 1 can be charged and discharged 50 times, the gas production amount of the battery monomer 1 is the sum of the gas generated by charging and discharging the battery monomer 1 for 50 times and the gas stored in the battery monomer 1.

[0152] In the embodiment of the present disclosure, the battery monomer 1 can be a ternary lithium battery, and the gas production amount of the ternary lithium battery is greater than or equal to 0.25 MPa and less than or equal to 0.45 MPa.

[0153] In the embodiment of the present disclosure, the gas production amount of the battery monomer 1 can be 0.25 MPa, can be 0.3 MPa, or can be 0.4 MPa.

[0154] In the embodiment of the present disclosure, the measurement of the gas production amount of the battery monomer 1 can be that the sealing port of the battery monomer 1 to be installed with a sealing nail is directly connected with a barometer through a gas guide pipe, and the charging and discharging in the whole life cycle of the battery monomer 1 is directly performed, at this time, the sum of the gas generated by the charging and discharging in the whole life cycle of the battery monomer 1 and the gas stored in the battery monomer 1 is directly displayed by the barometer.

[0155] The battery monomer 1 provided by the embodiment of the present disclosure has a pole 12 with a diameter greater than or equal to 18 mm and less than or equal to 36 mm.

[0156] In the embodiment of the present disclosure, the diameter of the pole can be 20 mm, the diameter of the pole can be 25 mm, and the diameter of the pole can be 30 mm.

[0157] In the embodiment of the present disclosure, the diameter of the pole 12 is denoted as L5.

[0158] In the embodiment of the present disclosure, the pole 12 is placed on a reference surface, and a vernier caliper is used to measure the pole 12 along the radial direction of the pole 12. For example, the diameter of the pole 12 is measured, and the vernier caliper is clamped on the opposite sides of the pole 12 along the radial direction of the pole 12. It should be noted that the diameter of the pole 12 refers to the distance between the two sides farthest away from each other along the radial direction of the pole 12.

[0159] The battery monomer 1 provided by the embodiment of the present disclosure is a square battery, and the length of the square battery is greater than or equal to 215 mm and less than or equal to 500 mm, and the width of the square battery is greater than or equal to 45 mm and less than or equal to 120 mm.

[0160] In the embodiments of the present disclosure, the length of the battery cell 1 can be 215 mm, and the width can be 50 mm. The length of the battery cell 1 can also be 300 mm, and the width can also be 80 mm.

[0161] The length of the battery cell 1 is denoted as L6, and the width is denoted as L7.

[0162] In the embodiments of the present disclosure, the measurement of the length and width of the battery cell 1 can be placing the battery cell 1 on a reference surface, and using a measuring tool such as a vernier caliper to measure the two sides arranged opposite along the length direction of the battery cell 1 and the two sides arranged opposite along the width direction of the battery cell 1. The length of the battery cell 1 should refer to the two sides with the farthest distance between the two opposite sides along the length direction of the battery cell 1. Similarly, the width of the battery cell 1 should refer to the two sides with the farthest distance between the two opposite sides along the width direction of the battery cell 1.

[0163] The embodiments of the present disclosure provide a battery device, which includes a plurality of battery cells 1 provided by the embodiments of the present disclosure.

[0164] In the embodiments of the present disclosure, the battery device can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly (Battery Cell Assembly) can include a plurality of battery cells 1, and the plurality of battery cells 1 are connected in series, in parallel, or in a mixed connection through a busbar component.

[0165] In the embodiments of the present disclosure, the battery device can be a battery pack, which includes a box body and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body.

[0166] In the embodiments of the present disclosure, the box body can include a first box body and a second box body. The first box body and the second box body are buckled to form a closed space inside the box body to accommodate the battery cell assembly. Here, the closed refers to covering or closing, which can be sealed or unsealed. The first box body can be a top cover or a bottom plate.

[0167] In the embodiments of the present disclosure, the box body can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected with the frame, so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0168] In the embodiments of the present disclosure, the box body can be part of the chassis structure of the vehicle. For example, the top cover of the box body can be at least part of the floor of the vehicle, or the frame of the box body can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0169] In the embodiments of the present disclosure, the battery device refers to an energy storage device, which includes a box body, and at least one side of the box body is provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0170] The embodiment of the present disclosure provides a power utilization device, which comprises at least one battery device provided by the embodiment of the present disclosure for providing electric energy.

[0171] In the embodiment of the present disclosure, the power utilization device can be a mobile phone, a portable device, a notebook computer, an electric vehicle, an electric toy, an electric tool, a vehicle, a ship and a spacecraft, etc. The spacecraft can include an airplane, a rocket, a space shuttle and a spaceship, etc.

[0172] The embodiment of the present disclosure further provides a specific technical solution, the thickness of the second flat part 132 along the axial direction of the pole 12 is greater than the thickness of the first flat part 131 along the axial direction of the pole 12, which is equivalent to thickening the side of the fixing part 13 close to the first wall 111; further, the thickness of the transition part 133 along the axial direction of the pole 12 is equal to the thickness of the second flat part 132 along the axial direction of the pole 12 or equal to the thickness of the first flat part 131 along the axial direction of the pole 12, when the thickness of the transition part 133 along the axial direction of the pole 12 is equal to the thickness of the second flat part 132 along the axial direction of the pole 12, it is equivalent to thickening the side of the fixing part 13 close to the first wall 111 and also thickening the side of the fixing part 13 facing the pole 12, when the thickness of the transition part 133 along the axial direction of the pole 12 is equal to the thickness of the first flat part 131 along the axial direction of the pole 12, it is equivalent to thickening only the side of the fixing part 13 close to the first wall 111; further, the ratio of the thickness of the first flat part 131 along the axial direction of the pole 12 to the thickness of the second flat part 132 along the axial direction of the pole 12 is greater than or equal to 0.4 and less than or equal to 0.9, and the ratio is preferably greater than or equal to 0.5 and less than or equal to 0.85; further, if the fixing part 13 is welded with the first wall 111, the welding penetration of the fixing part 13 and the first wall 111 should be less than or equal to the thickness of the second flat part 132 along the axial direction of the pole 12, because the thickness of the second flat part 132 along the axial direction of the pole 12 is increased, the penetration is increased accordingly, the welding strength is increased, and the strength of the pole 12 is further improved.

[0173] The embodiment of the present disclosure further provides a specific technical solution, the fixing member 13 is provided with a through hole 1331, and a reinforcing protrusion 1333 is further arranged on the fixing member 13, the reinforcing protrusion 1333 is located around the through hole 1331, and the reinforcing protrusion 1333 can be a reinforcing rib for example; further, the number of the reinforcing protrusions 1333 is greater than or equal to the number of the through holes 1331; still further, the through hole 1331 and the reinforcing protrusion 1333 are arranged at the transition portion 133, so as to avoid the risk that the fixing member 13 is in conduction with the pole 12 due to the reinforcing protrusion 1333 added to the first plane portion 131; still further, the stamping forming process can be considered, the side of the transition portion 133 away from the pole 12 is concave, the side of the transition portion 133 close to the pole 12 is convex to form the reinforcing protrusion 1333, so that the weight of the fixing member 13 can not be increased, and meanwhile, the strength of the pole 12 is improved without affecting the height of the pole 12.

[0174] The above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than limit them; although the present disclosure is described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions recorded in the above embodiments can still be modified, or some or all of the technical features can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present disclosure, and they should be covered in the scope of the specification of the present disclosure. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present disclosure is not limited to the specific embodiments disclosed in the present disclosure.

Claims

A battery cell comprises: a pole; an electrode assembly electrically connected with the pole; a housing, the electrode assembly is arranged in the housing, the housing has a first wall, the pole is arranged on the first wall; a fixing member, the fixing member comprises a first planar part, a transition part and a second planar part, the transition part is located between the first planar part and the second planar part, the first planar part is clamped with the pole, and the second planar part is connected with the first wall; at least one of the thickness of the second planar part along the axial direction of the pole and the thickness of the transition part along a direction perpendicular to the axial direction of the pole is greater than the thickness of the first planar part along the axial direction of the pole. The battery cell of claim 1, wherein, The thickness of the second planar part along the axial direction of the pole is greater than the thickness of the first planar part along the axial direction of the pole, and the ratio of the thickness of the first planar part along the axial direction of the pole to the thickness of the second planar part along the axial direction of the pole is greater than or equal to 0.4 and less than or equal to 0.

9. The battery cell of claim 2, wherein, The ratio of the thickness of the first planar part along the axial direction of the pole to the thickness of the second planar part along the axial direction of the pole is greater than or equal to 0.5 and less than or equal to 0.

85. The battery cell of any one of claims 1 to 3, wherein, The thickness of the transition part along a direction perpendicular to the axial direction of the pole is equal to the thickness of the second planar part along the axial direction of the pole. The battery cell of any one of claims 1 to 3, wherein, The thickness of the transition part along a direction perpendicular to the axial direction of the pole is equal to the thickness of the first planar part along the axial direction of the pole. The battery cell of any one of claims 1 to 5, wherein, The transition part is provided with a reinforcing protrusion on one side close to the pole or one side away from the pole, and the thickness of the transition part corresponding to the position provided with the reinforcing protrusion along a direction perpendicular to the axial direction of the pole is greater than the thickness of the first planar part along the axial direction of the pole. The battery cell of claim 6, wherein, The reinforcing protrusion is provided in a plurality, and the plurality of reinforcing protrusions are distributed on the transition part along the circumferential direction of the pole. The battery cell of claim 6, wherein, Along a direction perpendicular to the axial direction of the pole, the transition part is provided with a lightening groove on one side away from the pole, the reinforcing protrusion is arranged on one side of the transition part facing the pole, and the lightening groove is opposite to the reinforcing protrusion. The battery cell of claim 6, wherein, The battery cell further comprises an insulating member and a through hole, the insulating member is located between the pole and the fixing member for insulating the pole and the fixing member, and at least part of the insulating member is located on the hole wall of the through hole, and the through hole is arranged at the position of the transition part close to the reinforcing protrusion. The battery cell of claim 9, wherein, The reinforcing protrusion is provided in a plurality, the through hole is arranged between the plurality of reinforcing protrusions, and the plurality of reinforcing protrusions are uniformly distributed along the circumferential direction of the through hole. The battery cell of claim 9, wherein, The reinforcing protrusion is provided in a plurality, the through hole is provided in a plurality, and the plurality of through holes correspond to the plurality of reinforcing protrusions one by one. The battery cell of any one of claims 1 to 11, wherein, Along the axial direction of the pole, the thickness of the first wall is greater than 1.5 mm and less than or equal to 3.0 mm. The battery cell of any one of claims 1 to 12, wherein, The first wall comprises a connecting part and a non-connecting part, the connecting part is welded with the second planar part, and the sum of the thickness of the second planar part and the thickness of the non-connecting part along the axial direction of the pole is greater than the thickness of the non-connecting part. The battery cell of claim 13, wherein, Along the axial direction of the pole, the thickness of the connecting part is greater than the thickness of the non-connecting part. The battery cell of claim 14, wherein, The connecting portion is provided with a groove, along the axial direction of the pole, the depth of the groove is less than the thickness of the second flat portion, and the sum of the thickness between the side of the groove close to the second flat portion and the side of the groove away from the second flat portion and the thickness of the second flat portion is greater than the thickness of the non-connecting portion. The battery cell of claim 14, wherein, The connecting portion is provided with a groove, along the axial direction of the pole, the depth of the groove is greater than the thickness of the second flat portion, and the sum of the thickness between the side of the groove close to the second flat portion and the side of the groove away from the second flat portion and the thickness of the second flat portion is greater than the thickness of the non-connecting portion. The battery cell according to claim 15 or 16, wherein Along the axial direction of the pole, the welding depth of the second flat portion and the groove is less than or equal to the thickness of the second flat portion. The battery cell of any one of claims 1 to 17, 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, and / or the diameter of the pole is greater than or equal to 18 mm and less than or equal to 36 mm. A battery device comprising: The plurality of battery cells of any one of claims 1 to 18. An electrical device, comprising: At least one battery device of claim 19 for providing electrical energy. An electrical device, comprising:

Images