Battery monomer and power battery

Abstract

The utility model provides a battery monomer and a power battery, and relates to the technical field of batteries. The top cover assembly of the battery monomer comprises a top cover sheet with a mounting hole, a pole column penetrating through the mounting hole, and a plastic part arranged at the mounting hole and positioned between the top cover sheet and the pole column. A first anti-torsion structure is arranged on the peripheral side of the pole, the first anti-torsion structure is arranged close to the top of the pole, a through hole is formed in the plastic part, the pole penetrates through the through hole, a second anti-torsion structure is arranged on the hole wall of the through hole, and the first anti-torsion structure and the second anti-torsion structure are matched to limit the pole to rotate around the axis of the pole relative to the plastic part. According to the battery monomer provided by the invention, through the cooperation of the first anti-torsion structure and the second anti-torsion structure, the pole has higher anti-torsion capability, so that the possibility of loosening or falling off of the pole is reduced, and the use safety of the battery monomer is further improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery monomer and a power battery. BACKGROUND

[0002] In the top cover assembly of the existing battery monomer, the outer circumferential surface of the pole post is relatively smooth, and the pole post is combined with the plastic part connected to the top cover for use. In the working condition with high torsion, the relative rotation between the pole post and the plastic part is prone to occur, thereby causing the pole post to loosen or fall off, and affecting the use safety of the battery monomer. CONTENT OF THE UTILITY MODEL

[0003] Therefore, the present application aims to provide a battery monomer and a power battery, and aims to solve the technical problem that the relative rotation between the pole post and the plastic part is prone to occur in the prior art.

[0004] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0005] In a first aspect, the embodiments of the present application provide a battery monomer having a height direction, which comprises:

[0006] a shell having a receiving cavity and an opening in communication with the receiving cavity;

[0007] an electrode assembly arranged in the receiving cavity;

[0008] a top cover assembly connected to the shell to close the opening, the top cover assembly comprising a top cover sheet, a pole post and a plastic part, the top cover sheet being arranged on the opening, and the top cover sheet having a mounting hole penetrating therethrough along the height direction, the pole post being arranged through the mounting hole and being electrically connected to the electrode assembly, the pole post having an axis parallel to the height direction, the pole post having a top portion arranged away from the top cover sheet in the height direction, the pole post having an outer circumferential surface surrounding the axis, the outer circumferential surface being provided with a first anti-torsion structure, the first anti-torsion structure being arranged close to the top portion, the plastic part being arranged at the mounting hole and being located between the top cover sheet and the pole post, the plastic part being provided with a through hole, the pole post being arranged through the through hole, the through hole having a hole wall abutting against the pole post, the hole wall being provided with a second anti-torsion structure, the first anti-torsion structure and the second anti-torsion structure cooperating to limit the relative rotation of the pole post around the axis relative to the plastic part.

[0009] In one of the embodiments of the first aspect, the first anti-torsion structure comprises a plurality of first protrusions arranged along the circumferential direction of the outer circumferential surface, the second anti-torsion structure comprises a plurality of second recesses arranged along the circumferential direction of the hole wall, and each of the plurality of first protrusions is embedded in one of the plurality of second recesses; or

[0010] The first anti-torsion structure comprises a plurality of first recesses arranged along the circumference of the outer surface, and the second anti-torsion structure comprises a plurality of second protrusions arranged along the circumference of the hole wall, and each of the second protrusions is embedded in one of the first recesses.

[0011] In one of the embodiments of the first aspect, the first protrusion or the first recess is strip-shaped, and the length direction of the first protrusion or the first recess is inclined to the axis.

[0012] In one of the embodiments of the first aspect, at least two of the first protrusions are adjacent and arranged in a direction inclined to the axis; or

[0013] at least two of the first recesses are adjacent and arranged in a direction inclined to the axis; or

[0014] at least two of the first protrusions are adjacent and arranged in a direction parallel to the axis; or

[0015] at least two of the first recesses are adjacent and arranged in a direction parallel to the axis.

[0016] In one of the embodiments of the first aspect, the first recess comprises a first groove and a second groove arranged to intersect, the first groove extends along the direction of the axis, and the second groove extends along a direction surrounding the axis, and the second protrusion comprises a first protrusion and a second protrusion arranged to intersect, the first protrusion is arranged to correspond to the first groove, and the second protrusion is arranged to correspond to the second groove.

[0017] In one of the embodiments of the first aspect, the first recess is a circular hole, and the second protrusion is a cylindrical protrusion; or

[0018] the first recess is a square hole, and the second protrusion is a square protrusion.

[0019] In one of the embodiments of the first aspect, each of the adjacent two square holes is distributed in a staggered manner in the height direction, and each of the adjacent two square protrusions is arranged in a staggered manner in the height direction.

[0020] In one of the embodiments of the first aspect, the first anti-torsion structure is a rough layer, the rough layer has an uneven surface, and the second anti-torsion structure is an adhesive layer, and the adhesive layer is bonded to the rough layer.

[0021] In one of the embodiments of the first aspect, the battery cell has a projection plane perpendicular to the height direction, and the outer circumferential surface and the hole wall have non-circular shapes in the projection plane.

[0022] In a second aspect, the embodiments of the present application also provide a power battery comprising the battery cell of any one of the embodiments of the first aspect.

[0023] The beneficial effects of the present application are as follows:

[0024] In the battery cell provided by the present application, the top cover assembly comprises a top cover sheet, a pole and a plastic part. The top cover sheet has a mounting hole, the plastic part has a through hole, the pole is arranged in the mounting hole and the through hole respectively, the plastic part is arranged at the mounting hole and between the top cover sheet and the pole, the outer circumferential surface of the pole is provided with a first anti-torsion structure, and the hole wall of the through hole is provided with a second anti-torsion structure. In this way, the first anti-torsion structure and the second anti-torsion structure are matched to limit the rotation of the pole about its axis relative to the plastic part, so that the pole has higher anti-torsion capability, thereby reducing the possibility of loosening or falling off of the pole, and further improving the use safety of the battery cell. In addition, the waist part of the pole is usually a concave structure, or for a composite pole, the waist part is usually a welding position of the upper pole and the lower pole, and it is not easy to set the anti-torsion structure. In the top cover assembly provided by the present application, the first anti-torsion structure is arranged close to the top of the pole. Compared with other regions of the pole, the outer circumferential surface close to the top is easier to process and has smaller processing difficulty.

[0025] In order to make the above objectives, features and advantages of the present application more apparent and easy to understand, the following will specifically describe the preferred embodiments with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiments. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be considered as limiting the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0027] Figure 1 Fig. 1 shows a perspective structural schematic diagram of a battery cell in some embodiments of the present application;

[0028] Figure 2 Fig. 2 shows a perspective exploded structural schematic diagram of a battery cell in some embodiments of the present application;

[0029] Figure 3 Fig. 3 shows a perspective structural schematic diagram of a top cover assembly in some embodiments of the present application;

[0030] Figure 4 shows Figure 3 a sectional view structure schematic diagram in A-A of

[0031] Figure 5 shows Figure 4 a magnified structure schematic diagram in B area of

[0032] Figure 6 shows a three-dimensional structure schematic diagram of the first pole column in the application;

[0033] Figure 7 shows Figure 6 a magnified structure schematic diagram in C area of

[0034] Figure 8 shows a one-angle structure schematic diagram of the first pole column in the application;

[0035] Figure 9 shows a three-dimensional structure schematic diagram of the first plastic part in the application;

[0036] Figure 10 shows Figure 9 a magnified structure schematic diagram in D area of

[0037] Figure 11 shows a three-dimensional structure schematic diagram of the second pole column in the application;

[0038] Figure 12 shows Figure 11 a magnified structure schematic diagram in E area of

[0039] Figure 13 shows a three-dimensional structure schematic diagram of the second plastic part in the application;

[0040] Figure 14 shows a three-dimensional structure schematic diagram of the third pole column in the application;

[0041] Figure 15 shows a three-dimensional structure schematic diagram of the fourth pole column in the application;

[0042] Figure 16 shows a three-dimensional structure schematic diagram of the third plastic part in the application;

[0043] Figure 17 shows a three-dimensional structure schematic diagram of the fifth pole column in the application;

[0044] Figure 18 shows a three-dimensional structure schematic diagram of the sixth pole column in the application;

[0045] Figure 19 shows a three-dimensional structure schematic diagram of the fourth plastic part in the application;

[0046] Figure 20 A perspective structural schematic view of the seventh pole and the fifth plastic part in the application is shown;

[0047] Figure 21 A perspective structural schematic view of the eighth pole and the sixth plastic part in the application is shown;

[0048] Figure 22 A perspective structural schematic view of the eighth pole and the sixth plastic part in the application is shown;

[0049] Figure 23 A perspective structural schematic view of Figure 22 A sectional structural schematic view at F-F in the application is shown.

[0050] Main element symbol explanation:

[0051] 1000 - battery cell; 100 - top cover assembly; 110 - top cover sheet; 111 - mounting hole; 120 - pole; 121 - axis; 122 - top; 123 - first anti-torsion structure; 1231 - first protrusion; 1232 - first recess; 12321 - first groove; 12322 - second groove; 1234 - rough layer; 130 - plastic part; 131 - through hole; 132 - second anti-torsion structure; 1321 - second protrusion; 13211 - first protrusion; 13212 - second protrusion; 1322 - second recess; 1324 - adhesive layer; 200 - shell; 210 - opening; 220 - accommodating cavity; 300 - electrode assembly; Z - height direction. DETAILED DESCRIPTION

[0052] The embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary only, only for explaining the present application, and cannot be understood as a limitation of the present application.

[0053] In the description of the present application, it is understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0054] In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and are not to be construed as indicating or implying relative importance or an ordered ranking of the indicated technical features. Thus, features defined with "first", "second" or "third" can include, explicitly or implicitly, one or more of such features. In the description of the present application, the meaning of "a plurality of" is two or more, unless explicitly specified and limited otherwise.

[0055] In the present application, unless explicitly specified and limited otherwise, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0056] In the present application, unless explicitly specified and limited otherwise, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0057] The outer periphery of the pole is relatively smooth in the existing top cover assembly of the battery monomer, and the pole is combined with the plastic part connected to the top cover for use. In the working condition with high torsion, relative rotation is prone to occur between the pole and the plastic part, thereby causing the pole to loosen or fall off, and further causing the risk of electrolyte leakage, the pole disengaging from the electrical connection with the electrode assembly, etc., affecting the safety of the battery monomer.

[0058] In order to solve the above technical problems, as shown in Figures 1 to 5 The first aspect, the embodiments of the present application provide a battery monomer 1000, which relates to the technical field of battery and is mainly applied to power battery. The battery monomer 1000 can be a square battery, a cylindrical battery, a button battery, etc., which is not specifically limited here.

[0059] As shown in Figure 6 , Figure 8 and Figure 9 The battery monomer 1000 provided by the present embodiment has a height direction Z and comprises a shell 200, an electrode assembly 300 and a top cover assembly 100.

[0060] The shell 200 has a receiving cavity 220 and an opening 210 communicating with the receiving cavity 220, the electrode assembly 300 is arranged in the receiving cavity 220, and the top cover assembly 100 is connected to the shell 200 to close the opening 210. The top cover assembly 100 includes a top cover sheet 110, a pole 120 and a plastic part 130. The top cover sheet 110 covers the opening 210 and has a mounting hole 111 penetrating in the height direction Z. The pole 120 is arranged in the mounting hole 111 and is electrically connected to the electrode assembly 300. The axis 121 of the pole 120 is parallel to the height direction Z. The pole 120 has a top portion 122 arranged away from the top cover sheet 110 in the height direction Z. The pole 120 has an outer peripheral surface surrounding the axis 121. The outer peripheral surface is provided with a first anti-torsion structure 123 arranged close to the top portion 122. The plastic part 130 is arranged between the top cover sheet 110 and the pole 120 at the mounting hole 111. The plastic part 130 is provided with a through hole 131. The pole 120 is arranged in the through hole 131. The through hole 131 has a hole wall abutting against the pole 120. The hole wall is provided with a second anti-torsion structure 132. The first anti-torsion structure 123 and the second anti-torsion structure 132 cooperate to limit the rotation of the pole 120 about the axis 121 relative to the plastic part 130.

[0061] Exemplarily, the plastic part 130 can be connected to the top cover sheet 110 by clamping, screwing, bonding, interference fit and the like. The connection manner of the plastic part 130 and the top cover sheet 110 is not specifically limited. The pole 120 can be a positive pole and / or a negative pole. For example, when the pole 120 is applied to a square battery, the pole 120 can include a positive pole and a negative pole, which are arranged in the top cover sheet 110, respectively. When the pole 120 is applied to a cylindrical battery, the pole 120 can be a positive pole to serve as a positive pole of the cylindrical battery. Correspondingly, the shell of the cylindrical battery serves as a negative pole of the cylindrical battery. Of course, the pole 120 can also be a negative pole. In this case, the shell of the cylindrical battery serves as a positive pole of the cylindrical battery. The type of the pole 120 is not specifically limited.

[0062] It should be noted that the first anti-torsion structure 123 is arranged close to the top portion 122, which means that the first anti-torsion structure 123 is adjacent to the top portion 122, or the distance between the first anti-torsion structure 123 and the top portion 122 in the height direction Z is less than or equal to 0.1 mm. The electrode assembly 300 includes at least one bare cell. For example, the electrode assembly 300 can include one bare cell, or two bare cells, or more than three bare cells. The number of the bare cells is not specifically limited.

[0063] It can be understood that the battery cell 1000 provided by the embodiment has the mounting hole 111 in the top cover sheet 110, the through hole 131 in the plastic member 130, the pole column 120 penetrating the mounting hole 111 and the through hole 131 respectively, the plastic member 130 arranged at the mounting hole 111 and located between the top cover sheet 110 and the pole column 120, the first anti-torsion structure 123 arranged on the outer circumferential surface of the pole column 120, and the second anti-torsion structure 132 arranged on the hole wall of the through hole 131. In this way, the first anti-torsion structure 123 and the second anti-torsion structure 132 are matched to limit the rotation of the pole column 120 around the axis 121 relative to the plastic member 130, so that the pole column 120 has higher anti-torsion capacity, thereby reducing the possibility of loosening or falling off of the pole column 120, and further improving the use safety of the battery cell 1000.

[0064] In addition, the waist part of the pole column is usually a concave structure, or for a composite pole column, the waist part is usually a welding position of the upper pole column and the lower pole column, and it is not easy to arrange the anti-torsion structure. In the top cover assembly 100 provided by the embodiment, the first anti-torsion structure 123 is arranged close to the top part 122 of the pole column 120, and compared with other regions of the pole column 120, the outer circumferential surface close to the top part 122 is better in machining and has smaller machining difficulty.

[0065] As shown in FIG. 1, Figures 6 to 20 In one embodiment, the first anti-torsion structure 123 includes a plurality of first protrusions 1231 arranged along the circumferential direction of the outer circumferential surface, the second anti-torsion structure 132 includes a plurality of second recesses 1322 arranged along the circumferential direction of the hole wall, and the plurality of first protrusions 1231 are one-to-one correspondingly arranged in the plurality of second recesses 1322; or the first anti-torsion structure 123 includes a plurality of first recesses 1232 arranged along the circumferential direction of the outer circumferential surface, the second anti-torsion structure 132 includes a plurality of second protrusions 1321 arranged along the circumferential direction of the hole wall, and the plurality of second protrusions 1321 are one-to-one correspondingly arranged in the plurality of first recesses 1232.

[0066] In the embodiment, the mutual engagement of the outer circumferential surface of the pole column 120 and the through hole 131 of the plastic member 130 is realized through the design of the protrusions and the recesses, so as to effectively limit the rotation of the pole column 120, thereby improving the anti-torsion capacity of the pole column 120.

[0067] As shown in FIG. 1, Figure 11 and Figure 12As shown in the drawings, in one specific embodiment, the first protrusions 1231 or the first recesses 1232 are in the shape of a strip, and the length direction of the first protrusions 1231 or the first recesses 1232 is inclined to the axis 121. In this way, not only can the rotation of the pole post 120 about the axis 121 relative to the plastic member 130 be limited, but also the displacement of the pole post 120 in the direction of the axis 121 relative to the plastic member 130 can be limited, so that the pole post 120 has higher stability.

[0068] As shown in the drawings, Figures 11 to 14 In one specific embodiment, at least two first protrusions 1231 are adjacent and arranged in a direction inclined to the axis 121, or at least two first recesses 1232 are adjacent and arranged in a direction inclined to the axis 121, or at least two first protrusions 1231 are adjacent and arranged in a direction parallel to the axis 121, or at least two first recesses 1232 are adjacent and arranged in a direction parallel to the axis 121. In this way, not only can the rotation of the pole post 120 about the axis 121 relative to the plastic member 130 be limited, but also the displacement of the pole post 120 in the direction of the axis 121 relative to the plastic member 130 can be limited, so that the pole post 120 has higher stability.

[0069] As shown in the drawings, Figures 15 to 17 In one specific embodiment, the first recesses 1232 are circular holes, and the second protrusions 1321 are cylindrical protrusions. In this way, the mutual engagement of the outer circumferential surface of the pole post 120 and the through hole 131 of the plastic member 130 is achieved, the rotation of the pole post 120 about the axis 121 relative to the plastic member 130 is limited, and the torsional resistance of the pole post 120 is improved.

[0070] As shown in the drawings, Figure 20 In another specific embodiment, the first recesses 1232 are square holes, and the second protrusions 1321 are square protrusions. In this way, the rotation of the pole post 120 about the axis 121 relative to the plastic member 130 is also limited, and the torsional resistance of the pole post 120 is improved.

[0071] As shown in the drawings, Figure 20 Further, each of the adjacent square holes is arranged in a staggered manner in the height direction Z, and each of the adjacent square protrusions is arranged in a staggered manner in the height direction Z. By arranging the plurality of square holes and the plurality of square protrusions in a staggered manner, the rotation of the pole post 120 relative to the plastic member 130 can be better limited after the mutual engagement of the square protrusions and the square holes, so as to improve the torsional resistance of the pole post 120.

[0072] As shown in the drawings, Figure 18 and Figure 19As shown, in another specific embodiment, the first concave portion 1232 includes a first groove 12321 and a second groove 12322 that are intersectingly arranged, the first groove 12321 extending in the direction of the axis 121, and the second groove 12322 extending in the direction around the axis 121, and the second convex portion 1321 includes a first protrusion 13211 and a second protrusion 13212 that are intersectingly arranged, the first protrusion 13211 corresponding to the first groove 12321, and the second protrusion 13212 corresponding to the second groove 12322, that is, a plurality of first protrusions 13211 are embedded in a plurality of first grooves 12321 in a one-to-one correspondence, and a plurality of second protrusions 13212 are embedded in a plurality of second grooves 12322 in a one-to-one correspondence. In this way, the first groove 12321 and the second groove 12322 are intersecting to form Figure 18 The horizontal and vertical combination shape shown is formed by the intersection of the first protrusion 13211 and the second protrusion 13212 Figure 19 The horizontal and vertical combination shapes shown can better restrict the pole 120 from rotating relative to the plastic component 130 after the two horizontal and vertical combination shapes are engaged with each other, thereby improving the anti-torsion capability of the pole 120.

[0073] It should be noted that, for the above three specific embodiments, the first concave portion 1232 and the second convex portion 1321 may also be in other shapes, such as a rhombus, an ellipse, etc. Since the second convex portion 1321 is embedded in the first concave portion 1232, they can both play a role in limiting the rotation of the pole 120. No specific limitation is imposed on the shapes of the first concave portion 1232 and the second convex portion 1321. Figure 20 The staggered arrangement of adjacent square holes and adjacent square protrusions shown can also be applied to the embodiments of circular holes and cylindrical protrusions. Of course, it can also be applied to the embodiments of horizontal and vertical combination shapes. No specific restrictions are made on the application scenarios of the staggered arrangement.

[0074] like Figures 21 to 23 As shown, in another embodiment, the first anti-torsion structure 123 is a rough layer 1234 having an uneven surface, and the second anti-torsion structure 132 is an adhesive layer 1324 , which is bonded to the rough layer 1234 .

[0075] In this embodiment, the rough layer 1234 can increase the surface roughness of the outer peripheral surface of the pole 120, and the adhesive layer 1324 can improve the bonding strength between the outer peripheral surface of the pole 120 and the through hole 131 of the plastic component 130, thereby effectively limiting the rotation of the pole 120 relative to the plastic component 130, thereby improving the anti-torsion ability of the pole 120.

[0076] Exemplarily, the outer circumferential surface of the pole 120 can be made rough by sanding, blasting, spraying, or the like to form a rough layer 1234. The adhesive layer 1324 can be an AB glue layer (two-liquid mixed hardening glue), a double-sided adhesive layer, or the like, which is not specifically limited herein.

[0077] In one embodiment, the battery monomer 1000 has a projection plane perpendicular to the height direction Z, and the outer circumferential surface of the pole 120 and the hole wall of the through hole 131 are both non-circular in the projection plane.

[0078] It can be understood that the cooperation of the non-circular outer circumferential surface of the pole 120 and the non-circular hole wall of the through hole 131 can further limit the rotation of the pole 120 relative to the plastic part 130, thereby further improving the torsional resistance of the pole 120.

[0079] Exemplarily, the above-mentioned non-circular shape refers to a shape other than a circular shape, which can be an elliptical shape, a polygonal shape, or the like. The polygonal shape can further be a triangular shape, a quadrilateral shape, a pentagonal shape, a hexagonal shape, or the like. The quadrilateral shape can be, for example, a parallelogram, a trapezoid, a rectangle, a square, or the like. The type of non-circular shape is not specifically limited herein.

[0080] In a second aspect, the embodiments of the present application provide a power battery, which comprises the battery monomer 1000 in any of the embodiments of the first aspect.

[0081] It should be noted that the power battery is mainly applied to electric devices such as new energy vehicles, energy storage containers, spacecraft, and ships. When applied to a new energy vehicle, the power battery can be a battery pack, which further can be a battery pack comprising a plurality of battery modules, each of which comprises a plurality of battery monomers 1000. Of course, the battery pack can also comprise a plurality of battery monomers 1000, i.e., the module design is omitted, and a battery box containing a plurality of battery monomers 1000 is arranged in a new energy vehicle (Cell To Pack, CTP technology). Of course, the power battery can also comprise a plurality of battery monomers 1000, i.e., the battery pack is not used, and the battery module and battery box designs are omitted, and a plurality of battery monomers 1000 are directly integrated into a new energy vehicle (Cell To Chassis, CTC technology).

[0082] It should be understood that, since the power battery provided by the embodiments has the battery monomer 1000 in any of the embodiments of the second aspect, it has all the beneficial effects of the battery monomer 1000, which will not be described herein.

[0083] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are contained in at least one embodiment or example of the present application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0084] Although the embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and are not to be construed as limiting the present application, and the person skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A battery cell, characterized in that: Having a height direction (Z), the battery cell comprises: A housing (200) having a receiving cavity (220) and an opening (210) communicating with the receiving cavity (220); An electrode assembly (300) is disposed in the accommodating cavity (220); A top cover assembly (100) is connected to the housing (200) to close the opening (210); the top cover assembly (100) includes a top cover sheet (110), a pole (120) and a plastic part (130); the top cover sheet (110) is covered on the opening (210), and the top cover sheet (110) has a mounting hole (111) passing through it along the height direction (Z); the pole (120) is arranged in the mounting hole (111) and is electrically connected to the electrode assembly (300); the axis (121) of the pole (120) is parallel to the height direction (Z); the pole (120) has a top (122) arranged away from the top cover sheet (110) in the height direction (Z); the pole (120) has a plastic part (130) surrounding the axis ( The outer peripheral surface of the pole (121) is provided with a first anti-torsion structure (123), the first anti-torsion structure (123) is provided near the top (122), the plastic part (130) is provided at the mounting hole (111), and is located between the top cover (110) and the pole (120), a through hole (131) is provided on the plastic part (130), the pole (120) is passed through the through hole (131), the through hole (131) has a hole wall abutting against the pole (120), and a second anti-torsion structure (132) is provided on the hole wall, the first anti-torsion structure (123) and the second anti-torsion structure (132) cooperate to limit the pole (120) from rotating around the axis (121) relative to the plastic part (130).

2. The battery cell according to claim 1, wherein: The first anti-torsion structure (123) includes a plurality of first convex portions (1231), the plurality of first convex portions (1231) are arranged along the circumferential direction of the outer peripheral surface, the second anti-torsion structure (132) includes a plurality of second concave portions (1322), the plurality of second concave portions (1322) are arranged along the circumferential direction of the hole wall, and the plurality of first convex portions (1231) are embedded in the plurality of second concave portions (1322) in a one-to-one correspondence; or The first anti-torsion structure (123) includes a plurality of first recesses (1232), and the plurality of first recesses (1232) are arranged along the circumference of the outer peripheral surface; the second anti-torsion structure (132) includes a plurality of second protrusions (1321), and the plurality of second protrusions (1321) are arranged along the circumference of the hole wall, and the plurality of second protrusions (1321) are embedded in the plurality of first recesses (1232) in a one-to-one correspondence.

3. The battery cell according to claim 2, characterized in that: The shape of the first convex portion (1231) or the first concave portion (1232) is a bar, and the length direction of the first convex portion (1231) or the first concave portion (1232) is inclined to the axis (121).

4. The battery cell according to claim 2, characterized in that: At least two of the first protrusions (1231) are adjacent to each other and arranged in a direction inclined to the axis (121); or At least two of the first recesses (1232) are adjacent to each other and arranged in a direction inclined to the axis (121); or At least two of the first protrusions (1231) are adjacent to each other and arranged in a direction parallel to the axis (121); or At least two of the first recesses (1232) are adjacent to each other and arranged in a direction parallel to the axis (121).

5. The battery cell according to claim 2, characterized in that: The first recess (1232) includes a first groove (12321) and a second groove (12322) that are intersectingly arranged, the first groove (12321) extends along the direction of the axis (121), and the second groove (12322) extends along the direction surrounding the axis (121), and the second protrusion (1321) includes a first protrusion (13211) and a second protrusion (13212) that are intersectingly arranged, the first protrusion (13211) is arranged corresponding to the first groove (12321), and the second protrusion (13212) is arranged corresponding to the second groove (12322).

6. The battery cell according to claim 2, characterized in that The first concave portion (1232) is a circular hole, and the second convex portion (1321) is a cylindrical protrusion; or The first concave portion (1232) is a square hole, and the second convex portion (1321) is a square protrusion.

7. The battery cell according to claim 6, characterized in that Every two adjacent square holes are staggered in the height direction (Z), and every two adjacent square protrusions are staggered in the height direction (Z).

8. The battery cell according to claim 1, wherein: The first anti-torsion structure (123) is a rough layer (1234), and the rough layer (1234) has an uneven surface. The second anti-torsion structure (132) is an adhesive layer (1324), and the adhesive layer (1324) is bonded to the rough layer (1234).

9. The battery cell according to any one of claims 1 to 8, characterized in that: The battery cell has a projection plane, the projection plane is perpendicular to the height direction (Z), and the orthographic projection shapes of the outer peripheral surface and the hole wall on the projection plane are both non-circular.

10. A power battery, characterized in that: A battery cell comprising the battery cell according to any one of claims 1 to 9.

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