Battery cell, battery device, and electric apparatus

Abstract

The present disclosure relates to the technical field of batteries. Disclosed are a battery cell, a battery device, and an electric apparatus. The battery cell comprises a pole, an electrode assembly, a casing, and a fixing member, wherein the pole is electrically connected to the electrode assembly; the electrode assembly is arranged in the casing; the casing has a first wall; the pole is arranged on the first wall; the fixing member comprises a first flat portion, a transition portion, and a second flat portion; the transition portion is located between the first flat portion and the second flat portion; the first flat portion is engaged with the pole; the second flat portion is connected to the first wall; at least one of the thickness of the first flat portion in the axial direction of the pole, the thickness of the second flat portion in the axial direction of the pole, and the thickness of the transition portion in a direction perpendicular to the axial direction of the pole is greater than 0.8 mm and less than or equal to 1.5 mm.

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. 202411258830.4, 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 related technologies, 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 itself, the reliability of the battery cell is weak. SUMMARY

[0006] The present disclosure provides a battery cell, a battery device and an electric equipment, which has the technical effect of strengthening the strength of the fixing member itself, thereby reducing the risk of the pole breaking before the explosion-proof valve, causing the explosion-proof valve to fail, and further improving the reliability of the battery cell.

[0007] In a first aspect, the present disclosure provides a battery cell, the battery cell comprising a pole, an electrode assembly, a shell and a fixing member, wherein the pole and the electrode assembly are electrically connected; 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 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 clamped with the pole, and the second planar portion is connected with the first wall; at least one of the thickness of the first planar portion along the axial direction of the pole, the thickness of the second planar portion along the axial direction of the pole and the thickness of the transition portion along the direction perpendicular to the axial direction of the pole is greater than 0.8mm and less than or equal to 1.5mm.

[0008] The battery cell provided by the present disclosure has at least one of the thickness of the first flat part along the axial direction of the pole, the thickness of the second flat 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 greater than 0.8 mm and less than 1.5 mm, while the thickness of the first flat part along the axial direction of the pole, the thickness of the second flat 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 in the prior art are all less than 0.8 mm. Compared with the prior art, the thickness of at least one of the first flat part, the transition part and the second flat part provided by the present disclosure is greater than 0.8 mm and less than 1.5 mm, and the strength of the fixing part is correspondingly enhanced, the possibility of damage of the fixing part is reduced, on this basis, the risk of the pole rupturing before the explosion-proof valve is reduced, the possibility of the failure of the explosion-proof valve is reduced, and the reliability of the battery cell is improved.

[0009] In an implementation provided by the present disclosure, the thickness of the first flat part along the axial direction of the pole, the thickness of the second flat 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 are all greater than 0.8 mm and less than or equal to 1.5 mm.

[0010] The battery cell provided by the present disclosure has the thickness of the first flat part along the axial direction of the pole, the thickness of the second flat 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 all greater than 0.8 mm and less than or equal to 1.5 mm, which further enhances the strength of the fixing part and correspondingly further reduces the possibility of damage of the fixing part.

[0011] In an implementation provided by the present disclosure, the thickness of the first flat part along the axial direction of the pole, the thickness of the second flat 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 are the same.

[0012] The battery cell provided by the present disclosure has the thickness of the first flat part along the axial direction of the pole, the thickness of the second flat 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 the same, which improves the consistency of the thickness of the fixing part and facilitates processing and manufacturing.

[0013] 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 0.8 mm and less than or equal to 1.5 mm, and the thickness of the first flat part along the axial direction of the pole is equal to 0.8 mm.

[0014] The battery cell provided by the present disclosure, due to the second planar part being connected with the first wall, by making the thickness of the second planar part along the axial direction of the pole column greater than 0.8mm and less than or equal to 1.5mm, the reliability of the connection between the second planar part and the first wall is improved, and the thickness of the first planar part along the axial direction of the pole column is equal to 0.8mm, that is, the first planar part is not thickened, which avoids the fixed 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.

[0015] In an implementation manner provided by the present disclosure, the thickness of the transition part along the direction perpendicular to the axial direction of the pole column is the same as the thickness of the second planar part along the axial direction of the pole column.

[0016] The battery cell provided by the present disclosure, by making the thickness of the transition part along the direction perpendicular to the axial direction of the pole column the same as the thickness of the second planar part along the axial direction of the pole column, and the transition part being located between the first planar part and the second planar part, the reliability of the connection between the second planar part and the first wall is further improved.

[0017] In an implementation manner provided by the present disclosure, the ratio of the thickness of the first planar part along the axial direction of the pole column to the thickness of the second planar part along the axial direction of the pole column is greater than or equal to 0.4 and less than or equal to 0.9.

[0018] The battery cell provided by the present disclosure, by making the ratio of the thickness of the first planar part along the axial direction of the pole column to the thickness of the second planar part along the axial direction of the pole column greater than or equal to 0.4, the phenomenon of the second planar part being too thick and further increasing the overall height of the battery is reduced, and by making the ratio of the thickness of the first planar part along the axial direction of the pole column to the thickness of the second planar part along the axial direction of the pole column less than or equal to 0.9, the phenomenon of the second planar part being insufficient in strength and the connection between the second planar part and the first wall being weak is reduced, so that the pole column is broken before the explosion-proof valve.

[0019] In an implementation manner provided by the present disclosure, the ratio of the thickness of the first planar part along the axial direction of the pole column to the thickness of the second planar part along the axial direction of the pole column is greater than or equal to 0.5 and less than or equal to 0.85.

[0020] The battery cell provided by the present disclosure, by making the ratio of the thickness of the first planar part along the axial direction of the pole column to the thickness of the second planar part along the axial direction of the pole column greater than or equal to 0.5, the phenomenon of the second planar part being too thick and further increasing the overall height of the battery is further reduced, and by making the ratio of the thickness of the first planar part along the axial direction of the pole column to the thickness of the second planar part along the axial direction of the pole column less than or equal to 0.85, the phenomenon of the second planar part being insufficient in strength and the connection between the second planar part and the first wall being weak is further reduced, so that the pole column is broken before the explosion-proof valve, and the reliability of the battery cell is improved.

[0021] In an implementation provided by the present disclosure, the reinforcing protrusion is arranged on the transition portion towards the side close to the pole column, 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 reinforcing protrusion is arranged on the transition portion towards the side away from the pole column, 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.

[0022] The battery cell provided by the present disclosure thickens the position of the transition portion where the reinforcing protrusion is arranged, that is, thickens the position where the reinforcing protrusion is arranged only, thereby improving the strength of the transition portion and reducing the weight of the transition portion.

[0023] In an implementation provided by the present disclosure, the reinforcing protrusion is arranged on the transition portion towards the side close to the pole column, 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 reinforcing protrusion is arranged on the transition portion towards the side away from the pole column, 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.

[0024] The battery cell provided by the present disclosure thickens the position of the transition portion where the reinforcing protrusion is arranged, that is, thickens the position where the reinforcing protrusion is arranged only, thereby improving the strength of the transition portion and reducing the weight of the transition portion.

[0025] In an implementation provided by the present disclosure, the reinforcing protrusion is arranged on the transition portion towards the side close to the pole column, 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 reinforcing protrusion is arranged on the transition portion towards the side away from the pole column, 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.

[0026] The battery cell provided by the present disclosure thickens the position of the transition portion where the reinforcing protrusion is arranged, that is, thickens the position where the reinforcing protrusion is arranged only, thereby improving the strength of the transition portion and reducing the weight of the transition portion.

[0027] In an implementation provided by the present disclosure, the battery cell further comprises an insulating member and a through hole, the insulating member is arranged between the pole column and the fixing member to insulate the pole column and the fixing member, at least part of the insulating member is arranged on the hole wall of the through hole, and the through hole is arranged at the position of the transition portion close to the reinforcing protrusion.

[0028] The battery cell provided by the present disclosure reduces the possibility that the transition portion close to the through hole is preferentially broken.

[0029] In an implementation provided by the present disclosure, the reinforcing protrusions are 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.

[0030] The battery cell provided by the present disclosure further reduces the possibility that the transition portion near the through hole is weak in strength and preferentially ruptures 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.

[0031] In an implementation provided by the present disclosure, the reinforcing protrusions are a plurality of reinforcing protrusions, and the through hole is a plurality of through holes, the plurality of through holes corresponding to the plurality of reinforcing protrusions in one-to-one correspondence.

[0032] The battery cell provided by the present disclosure further reduces the possibility that the transition portion near the through hole is weak in strength and preferentially ruptures by arranging the plurality of through holes in one-to-one correspondence with the plurality of reinforcing protrusions.

[0033] 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 or equal to 1.5 mm and less than or equal to 3.0 mm.

[0034] The battery cell provided by the present disclosure reduces the possibility that the first wall separates from the shell due to the first wall being too thin, and the pole column ruptures 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.

[0035] In an implementation provided by the present disclosure, the first wall includes a connecting portion and a non-connecting portion, the connecting portion is welded to 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.

[0036] The battery cell provided by the present disclosure further improves the reliability of welding the first wall to 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.

[0037] In an implementation provided by the present disclosure, the thickness of the connecting portion is greater than the thickness of the non-connecting portion along the axial direction of the pole column.

[0038] The battery cell provided by the present disclosure facilitates welding by the worker by arranging 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, in other words, forming a boss on the first wall and welding the second planar portion to the boss.

[0039] In an implementation provided by the present disclosure, the connecting portion is provided with a groove, and the depth of the groove is less than the thickness of the second flat portion along the axial direction of the pole column. 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 is greater than the thickness of the non-connecting portion.

[0040] The battery cell provided by the present disclosure has a reduced overall height by providing the connecting portion with a groove, and the depth of the groove is less than the thickness of the second flat portion, in other words, a part of the second flat portion is located in the groove.

[0041] In an implementation provided by the present disclosure, the connecting portion is provided with a groove, and the depth of the groove is greater than the thickness of the second flat portion along the axial direction of the pole column. 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 is greater than the thickness of the non-connecting portion.

[0042] The battery cell provided by the present disclosure has a further reduced overall height by providing the connecting portion with a groove, and the depth of the groove is greater than the thickness of the second flat portion, in other words, the second flat portion is completely recessed in the groove.

[0043] In an implementation provided by the present disclosure, the welding depth of the second flat portion and the groove is less than or equal to the thickness of the second flat portion along the axial direction of the pole column.

[0044] The battery cell provided by the present disclosure has an improved appearance by making the welding depth of 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 pole column, in other words, the solder does not completely immerse the second flat portion.

[0045] 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.

[0046] 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.

[0047] In a second aspect, the present disclosure provides a battery device comprising the plurality of battery cells provided by any one of the first aspect.

[0048] The battery device provided by the present disclosure has the same technical effects as the battery cell provided by the first aspect, that is, the strength of the fixing member itself is strengthened, thereby reducing the risk of the pole column breaking before the rupture valve and the failure of the rupture valve, and further improving the reliability of the battery cell.

[0049] In a third aspect, the present disclosure provides a power consuming device comprising at least one battery device according to any one of the second aspect for providing electric energy.

[0050] The power consuming device according to the present disclosure comprises at least one battery device according to any one of the second aspect for providing electric energy, and the battery device comprises a plurality of battery cells according to any one of the first aspect. Therefore, the power consuming device has the same technical effects, i.e., the strength of the fixing member is enhanced, the risk of the pole breaking before the explosion-proof valve is reduced, the failure of the explosion-proof valve is avoided, and the reliability of the battery cells is improved. BRIEF DESCRIPTION OF DRAWINGS

[0051] 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:

[0052] FIG. 1 is a first perspective view of a battery cell according to an embodiment of the present disclosure;

[0053] FIG. 2 is a second perspective view of the battery cell according to an embodiment of the present disclosure;

[0054] FIG. 3 is a cross-sectional view of the battery cell according to an embodiment of the present disclosure;

[0055] FIG. 4 is an enlarged view of A in FIG. 3 according to an embodiment of the present disclosure;

[0056] FIG. 5 is an exploded view of a fixing member provided with a reinforcing protrusion on a side close to a pole, a portion of an insulating member, and the pole according to an embodiment of the present disclosure;

[0057] FIG. 6 is a perspective view of the fixing member provided with the reinforcing protrusion on the side close to the pole according to an embodiment of the present disclosure;

[0058] FIG. 7 is a cross-sectional view of the fixing member according to an embodiment of the present disclosure;

[0059] FIG. 8 is a bottom view of the fixing member according to an embodiment of the present disclosure;

[0060] FIG. 9 is an exploded view of a fixing member provided with a weight-reducing groove on a side away from a pole, a reinforcing protrusion on a side close to the pole, a portion of an insulating member, and the pole according to an embodiment of the present disclosure;

[0061] FIG. 10 is a perspective view of the fixing member according to an embodiment of the present disclosure;

[0062] FIG. 11 is a bottom view of the fixing member in FIG. 9, according to an embodiment of the present disclosure.

[0063] BRIEF DESCRIPTION OF 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 - weight-reducing groove; 1333 - reinforcing protrusion; 14 - explosion-proof valve; 15 - adapter; 16 - insulating member. DETAILED DESCRIPTION

[0064] The embodiments of the technical solutions of the present disclosure will be described in detail below with reference to the 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.

[0065] 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 present disclosure belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure; the terms "include" and "have" and any variations thereof used in the specification and claims of the present disclosure and the above description of drawings are intended to cover the non-exclusive inclusion.

[0066] 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.

[0067] 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.

[0068] In the description of the embodiments of the present 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 " / " herein generally represents an "or" relationship between the front and rear associated objects.

[0069] In the description of the embodiments of the present disclosure, the orientations or positional relationships indicated by the technical terms "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present disclosure and simplifying the description, and do 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 present disclosure.

[0070] In the description of the embodiments of the present disclosure, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to the specific circumstances.

[0071] In the description of the embodiments of the present 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, and can be contact between two objects in contact without interaction force, or contact between two objects in contact with interaction force.

[0072] Next, the present disclosure will be described in detail.

[0073] 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.

[0074] In the related art, the pole in the battery monomer is clamped with the fixing part, and the pole is also connected with the shell through the fixing part, but due to the design of the fixing part itself, the pole breaks earlier than the explosion-proof valve, the explosion-proof valve fails, and the reliability of the battery monomer is reduced.

[0075] The battery monomer provided by the embodiment of the present disclosure comprises a pole, an electrode assembly, a shell and a fixing piece, wherein the pole and the electrode assembly are electrically connected; 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 connected with the pole, and the second planar part is connected with the first wall; at least one of the thickness of the first planar part along the axial direction of the pole, 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 0.8 mm and less than or equal to 1.5 mm. By making at least one of the thickness of the first planar part along the axial direction of the pole, 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 greater than 0.8 mm and less than 1.5 mm, the thickness of at least one of the first planar part, the transition part and the second planar part is increased, and correspondingly, the strength of the fixing piece itself is also increased, and the possibility of damage of the fixing piece is reduced. On this basis, the risk of the pole breaking before the rupture of the explosion-proof valve is reduced, the possibility of the failure of the explosion-proof valve is reduced, and the reliability of the battery monomer is improved.

[0076] The embodiment of the present disclosure will be described in detail below with reference to the accompanying drawings.

[0077] Referring to FIGS. 1, 2 and 3, the embodiment of 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 pole 12 and the electrode assembly are electrically connected; 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 connected 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 first planar part 131 along the axial direction of the pole 12, the thickness of the second planar part 132 along the axial direction of the pole 12 and the thickness of the transition part 133 along the direction perpendicular to the axial direction of the pole 12 is greater than 0.8 mm and less than or equal to 1.5 mm.

[0078] In the embodiment of 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.

[0079] In the embodiment of 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 storage battery and the like, and the present disclosure is not limited thereto.

[0080] In the embodiments of the present disclosure, the battery cell 1 can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell, or a battery cell of other shapes, and the prismatic battery cell includes a square battery cell, a blade battery cell, a multi-prismatic battery cell, such as a hexagonal battery cell, and the like, and the embodiments of the present disclosure are not limited thereto.

[0081] In the embodiments of the present disclosure, the pole 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.

[0082] In the embodiments of the present disclosure, the electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging of the battery cell 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 short circuit of the positive electrode and the negative electrode, and at the same time, the active ions can pass through.

[0083] In the embodiments of the present disclosure, the electrode assembly can further include a tab, and here, the pole 12 is connected with the tab in the electrode assembly, the pole 12 can be two, and the two poles 12 are respectively and electrically connected with the positive and negative tabs in the electrode assembly one by one, or the pole 12 can be one, and the one pole 12 is electrically connected with the positive and negative tabs in the electrode assembly at the same time, and the embodiments of the present disclosure are not limited thereto.

[0084] In the embodiments of the present disclosure, the battery cell 1 further includes a shell 11, and the shell 11 is used for packaging the electrode assembly, 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.

[0085] In the embodiments of the present disclosure, the shell 11 can be integrally formed, or can be formed in a split manner, for example, the shell 11 is formed in a split manner, and the shell 11 can include a lower shell 11 and an upper end cover, and the upper end cover is fastened on the lower shell 11 to form a containing cavity, and the electrode assembly is arranged in the containing cavity. Of course, the pole 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 can be a first wall 111 on the lower shell 11, and the embodiments of the present disclosure are not limited thereto.

[0086] In the embodiments of the present disclosure, the second planar portion 132 is fixed to the first wall 111. Here, the fixing of the second planar portion 132 to the first wall 111 can be non-detachable fixing, such as welding, gluing, etc. Of course, the fixing of the second planar portion 132 to the first wall 111 can also be detachable fixing, such as threaded connection, buckle connection, etc. The embodiments of the present disclosure are not limited in this regard. In an implementation provided by the embodiments of the present disclosure, the second planar portion 132 is fixed to the first wall 111 by welding.

[0087] In the embodiments of the present disclosure, 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. This means that the fixing member 13 has 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. The second planar portion 132 forms an inner ring of the ring structure.

[0088] 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. The thickness of the transition portion 133 along a direction perpendicular to the axial direction of the pole 12 is denoted as L3.

[0089] 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 a direction perpendicular to the axial direction of the pole 12 can be measured by placing the fixing member 13 on a reference surface and then measuring the thicknesses of the three portions using 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 of the first planar portion 131 away from the first wall 111. Here, it should be noted that the thickness of the first planar portion 131 along the axial direction of the pole 12 should refer to the thickness of the section with the largest thickness in all sections along the axial direction of the pole 12.

[0090] In the embodiments of the present disclosure, at least one of the thickness of the first flat portion 131 along the axial direction of the pole 12, the thickness of the second flat 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 0.8 mm and less than or equal to 1.5 mm. For example, in specific embodiments, the thickness can be 0.9 mm, the thickness can be 1.0 mm, and the thickness can be 1.4 mm.

[0091] In the embodiments of the present disclosure, the thickness of the first flat portion 131 along the axial direction of the pole 12, the thickness of the second flat 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 all greater than 0.8 mm and less than or equal to 1.5 mm.

[0092] The thickness of at least one of the thickness of the first flat portion 131 along the axial direction of the pole column 12, the thickness of the second flat portion 132 along the axial direction of the pole column 12, and the thickness of the transition portion 133 along the direction perpendicular to the axial direction of the pole column 12 is greater than 0.8 mm and less than 1.5 mm, and in the related art, the thickness of the first flat portion 131 along the axial direction of the pole column 12, the thickness of the second flat portion 132 along the axial direction of the pole column 12, and the thickness of the transition portion 133 along the direction perpendicular to the axial direction of the pole column 12 are all less than 0.8 mm, compared with the related art, the thickness of at least one of the first flat portion 131, the transition portion 133, and the second flat portion 132 of the battery monomer 1 provided by the present disclosure is greater than 0.8 mm and less than 1.5 mm, and correspondingly, the strength of the fixing member 13 is also enhanced, and the possibility of damage of the fixing member 13 is reduced. On this basis, the risk of the pole column 12 rupturing before the explosion-proof valve 14 is reduced, the possibility of the explosion-proof valve 14 failing is caused, and the reliability of the battery monomer 1 is improved.

[0093] Referring to FIGS. 4, 5, and 6, the present disclosure provides a battery monomer 1, the thickness of the first flat portion 131 along the axial direction of the pole column 12, the thickness of the second flat portion 132 along the axial direction of the pole column 12, and the thickness of the transition portion 133 along the direction perpendicular to the axial direction of the pole column 12 are all greater than 0.8 mm and less than or equal to 1.5 mm.

[0094] In the present disclosure, the thickness of the first flat portion 131 along the axial direction of the pole column 12, the thickness of the second flat portion 132 along the axial direction of the pole column 12, and the thickness of the transition portion 133 along the direction perpendicular to the axial direction of the pole column 12 are all greater than 0.8 mm and less than or equal to 1.5 mm, but the present disclosure does not limit the size relationship between the thickness of the first flat portion 131 along the axial direction of the pole column 12, the thickness of the second flat portion 132 along the axial direction of the pole column 12, and the thickness of the transition portion 133 along the direction perpendicular to the axial direction of the pole column 12.

[0095] The battery monomer 1 provided by the present disclosure 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 column 12, the thickness of the second flat portion 132 along the axial direction of the pole column 12, and the thickness of the transition portion 133 along the direction perpendicular to the axial direction of the pole column 12 all greater than 0.8 mm and less than or equal to 1.5 mm, and correspondingly, the possibility of damage of the fixing member 13 is further reduced.

[0096] Referring to FIGS. 4, 5, and 6, the present disclosure provides a battery monomer 1, the thickness of the first flat portion 131 along the axial direction of the pole column 12, the thickness of the second flat portion 132 along the axial direction of the pole column 12, and the thickness of the transition portion 133 along the direction perpendicular to the axial direction of the pole column 12 are all greater than 0.8 mm and less than or equal to 1.5 mm.

[0097] In the embodiments of the present disclosure, the same thickness means substantially the same, for example, the thicknesses of the three are not more than an error threshold, which may, for example, be 0.1 mm, or may be 0.3 mm, and the like. In one implementation provided by the embodiments of the present disclosure, the error threshold is 0.3 mm.

[0098] In the embodiments of the present disclosure, the thickness of the first flat portion 131 along the axial direction of the pole 12, the thickness of the second flat portion 132 along the axial direction of the pole 12, and the thickness of the transition portion 133 along the vertical direction of the axial direction of the pole 12 may each be 1.0 mm; may each be 0.8 mm; or may each be 1.2 mm.

[0099] The battery monomer 1 provided by the embodiments of the present disclosure has the same thickness of the first flat portion 131 along the axial direction of the pole 12, the second flat portion 132 along the axial direction of the pole 12, and the transition portion 133 along the vertical direction of the axial direction of the pole 12, which facilitates the machining and manufacturing of the fixing member 13 while ensuring the consistency of the thickness of the fixing member 13. It should be noted that the thickness of the three is consistent and can be achieved by stamping. In this process, only the plate member with the same thickness needs to be stamped.

[0100] Referring to FIGS. 4, 5, and 6, the battery monomer 1 provided by the embodiments of the present disclosure has a thickness of the second flat portion 132 along the axial direction of the pole 12 greater than 0.8 mm and less than or equal to 1.5 mm, and a thickness of the first flat portion 131 along the axial direction of the pole 12 equal to 0.8 mm.

[0101] In the embodiments of the present disclosure, the thickness of the transition portion 133 along the vertical direction of the axial direction of the pole 12 may be equal to the thickness of the first flat portion 131 along the axial direction of the pole 12; the thickness of the transition portion 133 along the vertical direction of the axial direction of the pole 12 may also be greater than 0.8 mm and less than or equal to 1.5 mm; and the thickness of the transition portion 133 along the vertical direction of the axial direction of the pole 12 may also be the same as the thickness of the second flat portion 132 along the axial direction of the pole 12.

[0102] The battery monomer 1 provided by the embodiments of the present disclosure has the second flat portion 132 connected to the first wall 111, and the thickness of the second flat portion 132 along the axial direction of the pole 12 is greater than 0.8 mm and less than or equal to 1.5 mm, which is conducive to improving the reliability of the connection between the second flat portion 132 and the first wall 111. The thickness of the first flat portion 131 along the axial direction of the pole 12 is equal to 0.8 mm, that is, the first flat portion 131 is not thickened, which avoids the fixing member 13 being too heavy and thus the battery monomer 1 being too heavy, and facilitates the lightweight design of the battery monomer 1.

[0103] Referring to FIG. 4, FIG. 5 and FIG. 6, the battery cell 1 provided by the embodiment of the present disclosure has the same thickness of the transition portion 133 along the direction perpendicular to the axial direction of the pole 12 as the thickness of the second flat portion 132 along the axial direction of the pole 12.

[0104] In the embodiment of the present disclosure, the thickness of the transition portion 133 along the direction perpendicular to the axial direction of the pole 12 is the same as the thickness of the second flat portion 132 along the axial direction of the pole 12. For example, if the thickness of the second flat portion 132 along the axial direction of the pole 12 is 1.0 mm, the thickness of the transition portion 133 along the direction perpendicular to the axial direction of the pole 12 is also 1.0 mm.

[0105] The battery cell 1 provided by the embodiment of the present disclosure has the same thickness of the transition portion 133 along the direction perpendicular to the axial direction of the pole 12 as the thickness of the second flat portion 132 along the axial direction of the pole 12, and the transition portion 133 is located between the first flat portion 131 and the second flat portion 132, thereby further improving the reliability of the connection between the second flat portion 132 and the first wall 111.

[0106] Referring to FIG. 5, FIG. 6 and FIG. 7, the battery cell 1 provided by the embodiment of the present disclosure has a ratio of the thickness of the first flat portion 131 along the axial direction of the pole 12 to the thickness of the second flat portion 132 along the axial direction of the pole 12 greater than or equal to 0.4 and less than or equal to 0.9.

[0107] In the embodiment of the present disclosure, the ratio of the thickness of the first flat portion 131 along the axial direction of the pole 12 to the thickness of the second flat portion 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. In some specific embodiments, the ratio can be 0.5, the ratio can be 0.7, and the ratio can be 0.8.

[0108] In an example, the thickness of the first flat portion 131 along the axial direction of the pole 12 is 0.8 mm, and the thickness of the second flat portion 132 along the axial direction of the pole 12 is 1.3 mm. The ratio of the thickness of the first flat portion 131 along the axial direction of the pole 12 to the thickness of the second flat portion 132 along the axial direction of the pole 12 is 0.6.

[0109] In another example, the thickness of the first flat portion 131 along the axial direction of the pole 12 is 0.9 mm, and the thickness of the second flat portion 132 along the axial direction of the pole 12 is 1.2 mm. The ratio of the thickness of the first flat portion 131 along the axial direction of the pole 12 to the thickness of the second flat portion 132 along the axial direction of the pole 12 is 0.75.

[0110] The battery monomer 1 provided by the embodiment of the present disclosure reduces the phenomenon that the second flat part 132 is too thick and the overall height of the battery is increased by making the ratio of the axial thickness of the first flat part 131 along the pole column 12 to the axial thickness of the second flat part 132 along the pole column 12 greater than or equal to 0.4, and the ratio of the axial thickness of the first flat part 131 along the pole column 12 to the axial thickness of the second flat part 132 along the pole column 12 is less than or equal to 0.9, so as to reduce the phenomenon that the second flat part 132 is not strong enough, the connection between the second flat part 132 and the first wall 111 is weak, and the pole column 12 is broken before the explosion-proof valve 14.

[0111] Referring to FIGS. 5, 6 and 7, the embodiment of the present disclosure provides a battery monomer 1, the ratio of the axial thickness of the first flat part 131 along the pole column 12 to the axial thickness of the second flat part 132 along the pole column 12 is greater than or equal to 0.5 and less than or equal to 0.85.

[0112] In the embodiment of the present disclosure, the ratio of the axial thickness of the first flat part 131 along the pole column 12 to the axial thickness of the second flat part 132 along the pole column 12 is greater than or equal to 0.5 and less than or equal to 0.85, and in some specific embodiments, the ratio can be 0.6, the ratio can be 0.7, and the ratio can be 0.8.

[0113] In an example, the axial thickness of the first flat part 131 along the pole column 12 is 0.8 mm, and the axial thickness of the second flat part 132 along the pole column 12 is 1.3 mm, and the ratio of the axial thickness of the first flat part 131 along the pole column 12 to the axial thickness of the second flat part 132 along the pole column 12 is 0.6.

[0114] In another example, the axial thickness of the first flat part 131 along the pole column 12 is 0.9 mm, and the axial thickness of the second flat part 132 along the pole column 12 is 1.2 mm, and the ratio of the axial thickness of the first flat part 131 along the pole column 12 to the axial thickness of the second flat part 132 along the pole column 12 is 0.75.

[0115] The battery monomer 1 provided by the embodiment of the present disclosure further reduces the phenomenon that the second flat part 132 is too thick and the overall height of the battery is increased by making the ratio of the axial thickness of the first flat part 131 along the pole column 12 to the axial thickness of the second flat part 132 along the pole column 12 greater than or equal to 0.5, and the ratio of the axial thickness of the first flat part 131 along the pole column 12 to the axial thickness of the second flat part 132 along the pole column 12 is less than or equal to 0.85, so as to further reduce the phenomenon that the second flat part 132 is not strong enough, the connection between the second flat part 132 and the first wall 111 is weak, and the pole column 12 is broken before the explosion-proof valve 14.

[0116] Referring to FIGS. 7 and 8, the battery cell 1 provided in the embodiment of the present disclosure includes the reinforcing protrusion 1333 arranged on the transition portion 133 toward the side close to the pole column 12, and the thickness of the transition portion 133 along the direction perpendicular to the axial direction of the pole column 12 is the thickness between the side of the reinforcing protrusion 1333 close to the pole column 12 and the side of the transition portion 133 away from the pole column 12 along the direction perpendicular to the axial direction of the pole column 12, and / or the reinforcing protrusion 1333 arranged on the transition portion 133 toward the side away from the pole column 12, and the thickness of the transition portion 133 along the direction perpendicular to the axial direction of the pole column 12 is the thickness between the side of the transition portion 133 close to the pole column 12 and the side of the reinforcing protrusion 1333 away from the pole column 12 along the direction perpendicular to the axial direction of the pole column 12, and the thickness of the transition portion 133 along the direction perpendicular to the axial direction of the pole column 12 is greater than 0.8 mm and less than or equal to 1.5 mm.

[0117] In the embodiment of the present disclosure, the reinforcing protrusion 1333 can be arranged on the transition portion 133 toward the side close to or away from the pole column 12, and the number of the reinforcing protrusions 1333 is not limited in the embodiment of the present disclosure. In an implementation provided in the embodiment of the present disclosure, eight reinforcing protrusions 1333 are arranged on the transition portion 133 toward the side close to the pole column 12.

[0118] In the battery cell 1 provided in the embodiment of the present disclosure, the reinforcing protrusion 1333 is arranged on the transition portion 133 toward the side close to the pole column 12 and / or the reinforcing protrusion 1333 arranged on the transition portion 133 toward the side away from the pole column 12, and the thickness of the transition portion 133 along the direction perpendicular to the axial direction of the pole column 12 is greater than 0.8 mm and less than or equal to 1.5 mm, in other words, the position of the transition portion 133 where the reinforcing protrusion 1333 is arranged is thickened, and the strength of the transition portion 133 is improved while the weight of the transition portion 133 is reduced, and the height of the fixing member 13 along the axial direction of the pole column 12 is not increased.

[0119] Referring to FIGS. 7 and 8, the battery cell 1 provided in the embodiment of the present disclosure includes the reinforcing protrusion 1333 arranged on the transition portion 133 toward the side close to the pole column 12, and the thickness of the transition portion 133 along the direction perpendicular to the axial direction of the pole column 12 is the thickness between the side of the reinforcing protrusion 1333 close to the pole column 12 and the side of the transition portion 133 away from the pole column 12 along the direction perpendicular to the axial direction of the pole column 12, and / or the reinforcing protrusion 1333 arranged on the transition portion 133 toward the side away from the pole column 12, and the thickness of the transition portion 133 along the direction perpendicular to the axial direction of the pole column 12 is the thickness between the side of the transition portion 133 close to the pole column 12 and the side of the reinforcing protrusion 1333 away from the pole column 12 along the direction perpendicular to the axial direction of the pole column 12, and the thickness of the transition portion 133 along the direction perpendicular to the axial direction of the pole column 12 is greater than 0.8 mm and less than or equal to 1.5 mm.

[0120] In the embodiment of the present disclosure, the reinforcing protrusion 1333 is eight, and the eight reinforcing protrusions 1333 are arranged in four groups, and the four groups of reinforcing protrusions 1333 are distributed on the transition portion 133 along the circumferential direction of the pole column 12 and spaced 90 degrees apart from each other.

[0121] The battery cell 1 provided in the embodiment of the present disclosure further improves the strength of the fixing member 13 by arranging the plurality of reinforcing protrusions 1333 on the transition portion 133 along the circumferential direction of the pole column 12.

[0122] 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.

[0123] 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.

[0124] 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.

[0125] 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.

[0126] 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.

[0127] 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.

[0128] 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.

[0129] 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.

[0130] 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.

[0131] 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.

[0132] 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.

[0133] 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.

[0134] 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.

[0135] 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 or equal to 1.5 mm and less than or equal to 3.0 mm along the axial direction of the pole column 12.

[0136] In the embodiments of the present disclosure, the thickness of the first wall 111 is represented as L4.

[0137] In the embodiments of the present disclosure, the measurement that the thickness of the first wall 111 is 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 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 111. 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 the side close to the second planar part 132. It should be noted that the measurement of 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.

[0138] In the embodiment of the present disclosure, the thickness of the first wall 111 along the axial direction of the pole column 12 can be 2.0 mm, can be 1.7 mm, or can be 2.3 mm.

[0139] 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.

[0140] 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 connecting portion 1111 is greater than the thickness of the non-connecting portion 1112 along the axial direction of the pole column 12.

[0141] 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.

[0142] 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.

[0143] 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.

[0144] 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.

[0145] 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.

[0146] 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.

[0147] 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.

[0148] 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.

[0149] Referring to FIG. 3 and FIG. 4, the battery monomer 1 provided by the embodiment of the present disclosure, 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.

[0150] 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.

[0151] 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.

[0152] 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 should be greater than 2 mm.

[0153] 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.

[0154] 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.

[0155] 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.

[0156] 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.

[0157] 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.

[0158] 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.

[0159] 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.

[0160] 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.

[0161] 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.

[0162] 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.

[0163] 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.

[0164] 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.

[0165] 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.

[0166] 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.

[0167] 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, or the diameter of the pole can be 30 mm.

[0168] In the embodiment of the present disclosure, the diameter of the pole 12 is denoted as L5.

[0169] 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 should refer to the distance between the two sides that are farthest apart along the radial direction of the pole 12.

[0170] 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.

[0171] 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.

[0172] The length of the battery cell 1 is denoted as L6, and the width is denoted as L7.

[0173] 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. It should be noted that 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, and 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.

[0174] 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.

[0175] 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 connected in series, parallel or mixed connection through a busbar component.

[0176] 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.

[0177] 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. The closed here means covered or closed, which can be sealed or unsealed. The first box body can be a top cover or a bottom plate.

[0178] 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.

[0179] 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.

[0180] 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.

[0181] The embodiment of the present disclosure provides a battery device.

[0182] The power consuming 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 spacecraft, etc.

[0183] The embodiment of the present disclosure also 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 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 to 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.

[0184] 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.

[0185] 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

1. A battery cell, comprising: a pole; an electrode assembly, the pole and the electrode assembly being electrically connected; a housing, the electrode assembly being disposed in the housing, the housing having a first wall, the pole being disposed 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 engaged with the pole, the second planar portion being connected with the first wall; at least one of a thickness of the first planar portion along an axial direction of the pole, a thickness of the second planar portion along the axial direction of the pole, and a thickness of the transition portion along a direction perpendicular to the axial direction of the pole is greater than 0.8 mm and less than or equal to 1.5 mm. all of the thickness of the first planar portion along the axial direction of the pole, the thickness of the second planar portion along the axial direction of the pole, and the thickness of the transition portion along the direction perpendicular to the axial direction of the pole are 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, the thickness of the second planar portion along the axial direction of the pole, and the thickness of the transition portion along the direction perpendicular to the axial direction of the pole are the same. the thickness of the second planar portion along the axial direction of the pole 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 is equal to 0.8 mm. the thickness of the transition portion along the direction perpendicular to the axial direction of the pole is the same as the thickness of the second planar portion along the axial direction of the pole. a ratio of the thickness of the first planar portion along the axial direction of the pole to the thickness of the second planar portion along the axial direction of the pole is greater than or equal to 0.4 and less than or equal to 0.

9. a ratio of the thickness of the first planar portion along the axial direction of the pole to the thickness of the second planar portion along the axial direction of the pole is greater than or equal to 0.5 and less than or equal to 0.

85. the transition portion is provided with a reinforcing protrusion towards a side close to the pole, and the thickness of the transition portion along the direction perpendicular to the axial direction of the pole is a thickness between a side of the reinforcing protrusion close to the pole and a side of the transition portion away from the pole along the direction perpendicular to the axial direction of the pole, and / or the transition portion is provided with a reinforcing protrusion towards a side away from the pole, and the thickness of the transition portion along the direction perpendicular to the axial direction of the pole is a thickness between a side of the transition portion close to the pole and a side of the reinforcing protrusion away from the pole along the direction perpendicular to the axial direction of the pole, the thickness of the transition portion along the direction perpendicular to the axial direction of the pole is greater than 0.8 mm and less than or equal to 1.5 mm. the reinforcing protrusion is a plurality of reinforcing protrusions, the plurality of reinforcing protrusions are distributed on the transition portion along a circumferential direction of the pole, and / or a weight-reducing groove is provided on a side of the transition portion away from the pole along a direction perpendicular to the axial direction of the pole, the reinforcing protrusion is provided on a side of the transition portion towards the pole, and the weight-reducing groove is opposite to the reinforcing protrusion. ​ ​ ​ ​ ​ 2. The battery cell of claim 1, wherein, ​ 3. The battery cell of claim 2, wherein, ​ 4. The battery cell of claim 1, wherein, ​ 5. The battery cell of claim 4, wherein, ​ 6. The battery cell of claim 4 or 5, wherein, ​ 7. The battery cell of claim 6, wherein, ​ 8. The battery cell of any one of claims 1 to 7, wherein, ​ 9. The battery cell of claim 8, wherein, ​ 10. 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.

11. The battery cell of claim 10, 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, or the reinforcing protrusions are multiple, the through holes are multiple, and the multiple through holes correspond to the multiple reinforcing protrusions one by one.

12. The battery cell of any one of claims 1-11, 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.

13. The battery cell of any one of claims 1-12, 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.

14. The battery cell of claim 13, wherein, In the axial direction of the pole, the thickness of the connecting portion is greater than the thickness of the non-connecting portion.

15. The battery cell of claim 13, 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.

16. The battery cell of claim 13, 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.

17. The battery cell of claim 15 or 16, 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.

18. The battery cell of any one of claims 1-17, 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.

19. A battery device comprising: A plurality of battery cells according to any one of claims 1 to 18.

20. An electrical device, comprising: at least one battery device according to claim 19 for providing electrical energy.

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