Battery cell and power battery
By setting anti-torsion structures on the outer circumference of the electrode post and the wall of the through hole in the plastic part, the problem of the electrode post and plastic part rotating under high torque conditions is solved, thereby improving the safety and stability of the battery cell.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- SUNWODA MOBILITY ENERGY TECHNOLOGY CO LTD
- Filing Date
- 2025-10-29
- Publication Date
- 2026-05-15
AI Technical Summary
In existing technologies, the terminal post and the plastic part are prone to relative rotation under high torque conditions, which can cause the terminal post to loosen or fall off, affecting the safety of the battery cell.
A first anti-torsion structure is provided on the outer peripheral surface of the electrode post, and a second anti-torsion structure is provided on the wall of the through hole of the plastic part. The two structures work together to restrict the rotation of the electrode post relative to the plastic part around its axis, thereby improving the anti-torsion capability.
It effectively reduces the possibility of the terminal post loosening or falling off, improves the safety of the battery cell, and simplifies the processing difficulty of the anti-torsion structure.
Smart Images
Figure CN2025130913_15052026_PF_FP_ABST
Abstract
Description
A battery cell and a power battery
[0001] Cross-reference to related applications
[0002] This application claims priority to Chinese Patent Application No. 2024227162719, filed on November 7, 2024, entitled "A Battery Cell and a Power Battery", the entire contents of which are incorporated herein by reference. Technical Field
[0003] This application relates to the field of battery technology, and in particular to a battery cell and a power battery. Background Technology
[0004] In the top cover assembly of a battery cell, the outer circumferential surface of the terminal post is relatively smooth. The terminal post is used in conjunction with the plastic parts connected to the top cover. Under high torque conditions, relative rotation can easily occur between the terminal post and the plastic parts, which can cause the terminal post to loosen or fall off, affecting the safety of the battery cell.
[0005] Application content
[0006] In view of this, the purpose of this application is to provide a battery cell and a power battery, which aims to solve the technical problem that relative rotation easily occurs between the terminal and the plastic part in the prior art.
[0007] To achieve the above objectives, the technical solution adopted in this application is as follows:
[0008] In a first aspect, embodiments of this application provide a battery cell having a height orientation, the battery cell comprising:
[0009] The housing has a receiving cavity and an opening communicating with the receiving cavity;
[0010] The electrode assembly is disposed within the receiving cavity;
[0011] A top cover assembly is connected to the housing to close the opening. The top cover assembly includes a top cover plate, an electrode post, and a plastic part. The top cover plate covers the opening and has a mounting hole extending through it along the height direction. The electrode post passes through the mounting hole and is electrically connected to the electrode assembly. The axis of the electrode post is parallel to the height direction. The electrode post has a top portion in the height direction that is opposite to the top cover plate. The electrode post has an outer peripheral surface surrounding the axis. A first anti-torsion structure is provided on the outer peripheral surface. The first anti-torsion structure is located near the top portion. The plastic part is located at the mounting hole and between the top cover plate and the electrode post. A through hole is formed in the plastic part. The electrode post passes through the through hole. The through hole has a hole wall that abuts against the electrode post. A second anti-torsion structure is provided on the hole wall. The first anti-torsion structure and the second anti-torsion structure cooperate to restrict the electrode post from rotating relative to the plastic part around the axis.
[0012] In one embodiment of the first aspect, the first anti-torsion structure includes a plurality of first protrusions arranged circumferentially along the outer peripheral surface; the second anti-torsion structure includes a plurality of second recesses arranged circumferentially along the hole wall; and the plurality of first protrusions are correspondingly embedded in the plurality of second recesses.
[0013] The first anti-torsion structure includes a plurality of first recesses, which are arranged circumferentially along the outer peripheral surface. The second anti-torsion structure includes a plurality of second protrusions, which are arranged circumferentially along the hole wall, and the plurality of second protrusions are embedded in the plurality of first recesses one by one.
[0014] In one embodiment 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.
[0015] In one embodiment of the first aspect, at least two of the first protrusions are adjacent and arranged obliquely to the axis; or
[0016] At least two of the first recesses are adjacent and their arrangement is inclined to the axis; or
[0017] At least two of the first protrusions are adjacent and arranged in a direction parallel to the axis; or
[0018] At least two of the first recesses are adjacent and arranged in a direction parallel to the axis.
[0019] In one embodiment of the first aspect, the first recess includes an intersecting first groove and a second groove, the first groove extending along the direction of the axis and the second groove extending around the axis; the second protrusion includes an intersecting first protrusion and a second protrusion, the first protrusion corresponding to the first groove and the second protrusion corresponding to the second groove.
[0020] In one embodiment of the first aspect, the first recess is a circular hole, and the second protrusion is a cylindrical protrusion; or
[0021] The first recess is a square hole, and the second protrusion is a square protrusion.
[0022] In one embodiment of the first aspect, each pair of adjacent square holes are staggered in the height direction, and each pair of adjacent square protrusions are staggered in the height direction.
[0023] In one embodiment of the first aspect, the first anti-torsion structure is a rough layer having an uneven surface, and the second anti-torsion structure is an adhesive layer bonded to the rough layer.
[0024] In one embodiment of the first aspect, the battery cell has a projection plane perpendicular to the height direction, and the orthographic projection shapes of the outer peripheral surface and the hole wall on the projection plane are both non-circular.
[0025] Secondly, embodiments of this application also provide a power battery, including the battery cell described in any of the embodiments of the first aspect above.
[0026] The beneficial effects of this application are as follows:
[0027] The battery cell provided in this application includes a top cover assembly comprising a top cover sheet, terminals, and a plastic component. The top cover sheet has mounting holes, and the plastic component has through holes. The terminals are respectively inserted through the mounting holes and through holes. The plastic component is positioned at the mounting holes, between the top cover sheet and the terminals. A first anti-torsion structure is provided on the outer circumferential surface of the terminals, and a second anti-torsion structure is provided on the wall of the through holes. Thus, the first and second anti-torsion structures work together to restrict the rotation of the terminals relative to the plastic component around their axes, giving the terminals higher torsional resistance and reducing the possibility of loosening or detachment, thereby improving the safety of the battery cell. Furthermore, the waist of the terminals is usually a recessed structure, or for composite terminals, the waist is usually the welding point of the upper and lower terminals, making it difficult to provide an anti-torsion structure. However, in the top cover assembly provided in this application, the first anti-torsion structure is positioned close to the top of the terminals. Compared to other areas of the terminals, the outer circumferential surface near the top is easier to process and less difficult to manufacture. Attached Figure Description
[0028] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0029] Figure 1 shows a three-dimensional structural schematic diagram of a battery cell in some embodiments of this application;
[0030] Figure 2 shows a three-dimensional exploded structure diagram of a battery cell in some embodiments of this application;
[0031] Figure 3 shows a three-dimensional structural schematic diagram of the top cover assembly in some embodiments of this application;
[0032] Figure 4 shows a schematic cross-sectional view of the structure at point AA in Figure 3;
[0033] Figure 5 shows an enlarged structural schematic diagram of region B in Figure 4;
[0034] Figure 6 shows a three-dimensional structural schematic diagram of the first type of pole post in this application;
[0035] Figure 7 shows an enlarged structural schematic diagram of region C in Figure 6;
[0036] Figure 8 shows a schematic diagram of the first type of pole post in this application from one perspective;
[0037] Figure 9 shows a three-dimensional structural diagram of the first type of plastic part in this application;
[0038] Figure 10 shows an enlarged structural schematic diagram of region D in Figure 9;
[0039] Figure 11 shows a three-dimensional structural schematic diagram of the second type of pole post in this application;
[0040] Figure 12 shows an enlarged structural schematic diagram of region E in Figure 11;
[0041] Figure 13 shows a three-dimensional structural diagram of the second type of plastic part in this application;
[0042] Figure 14 shows a three-dimensional structural schematic diagram of the third type of pole post in this application;
[0043] Figure 15 shows a three-dimensional structural schematic diagram of the fourth type of pole post in this application;
[0044] Figure 16 shows a three-dimensional structural diagram of the third type of plastic part in this application;
[0045] Figure 17 shows a three-dimensional structural schematic diagram of the fifth type of pole post in this application;
[0046] Figure 18 shows a three-dimensional structural schematic diagram of the sixth type of pole post in this application;
[0047] Figure 19 shows a three-dimensional structural diagram of the fourth type of plastic part in this application;
[0048] Figure 20 shows a three-dimensional structural diagram of the seventh type of pole and the fifth type of plastic part in this application;
[0049] Figure 21 shows a three-dimensional structural diagram of the eighth type of pole post and the sixth type of plastic part in this application;
[0050] Figure 22 shows a schematic diagram of the assembly structure of the eighth pole and the sixth plastic part in this application from one perspective.
[0051] Figure 23 shows a schematic cross-sectional view of the structure at FF in Figure 22.
[0052] Key component symbols: 1000 - Battery cell; 100 - Top cover assembly; 110 - Top cover sheet; 111 - Mounting hole; 120 - Terminal post; 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 - Housing; 210 - Opening; 220 - Receiving cavity; 300 - Electrode assembly; Z - Height direction. Detailed Implementation
[0053] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.
[0054] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.
[0055] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0056] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0057] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0058] In the top cover assembly of a battery cell, the outer circumferential surface of the terminal post is relatively smooth. The terminal post is used in conjunction with the plastic parts connected to the top cover. Under high torque conditions, the terminal post and the plastic parts are prone to relative rotation, which can cause the terminal post to loosen or fall off. This can lead to risks such as electrolyte leakage and the terminal post detaching from the electrical connection of the electrode assembly, affecting the safety of the battery cell.
[0059] To address the aforementioned technical problems, as shown in Figures 1 to 5, in a first aspect, embodiments of this application provide a battery cell 1000, relating to the field of battery technology and primarily applied in power batteries. The battery cell 1000 can be a prismatic battery, a cylindrical battery, a button battery, etc., and no specific limitations are imposed here.
[0060] As shown in Figures 6, 8 and 9, the battery cell 1000 provided in this embodiment has a height direction Z and includes a housing 200, an electrode assembly 300 and a top cover assembly 100.
[0061] The housing 200 has a receiving cavity 220 and an opening 210 in the receiving cavity 220. The electrode assembly 300 is disposed in the receiving cavity 220. The top cover assembly 100 is connected to the housing 200 to close the opening 210. The top cover assembly 100 includes a top cover plate 110, an electrode post 120 and a plastic part 130. The top cover plate 110 covers the opening 210 and has a mounting hole 111 that extends through it along the height direction Z. The electrode post 120 is disposed through the mounting hole 111 and is electrically connected to the electrode assembly 300. The axis 121 of the electrode post 120 is parallel to the height direction Z. The electrode post 120 has a top 122 in the height direction Z that is away from the top cover plate 110. The electrode post 120 has an outer peripheral surface surrounding the axis 121. A first anti-torsion structure 123 is disposed on the outer peripheral surface. The first anti-torsion structure 123 is disposed near the top 122. The plastic part 130 is disposed at the mounting hole 111 and is located between the top cover plate 110 and the pole post 120. The plastic part 130 has a through hole 131, and the pole post 120 is disposed through the through hole 131. The through hole 131 has a hole wall that abuts against the pole post 120. 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 restrict the pole post 120 from rotating relative to the plastic part 130 around the axis 121.
[0062] For example, the plastic part 130 can be connected to the top cover plate 110 by means of snap-fit, screw connection, bonding, interference fit, etc., and no specific limitation is made here on the connection method between the plastic part 130 and the top cover plate 110. The terminal 120 can be a positive terminal and / or a negative terminal. For example, when the terminal 120 is applied to a square battery, the terminal 120 can include a positive terminal and a negative terminal, which are respectively disposed on the top cover plate 110; when the terminal 120 is applied to a cylindrical battery, the terminal 120 can be a positive terminal to serve as the positive electrode of the cylindrical battery, and correspondingly, the casing of the cylindrical battery serves as the negative electrode of the cylindrical battery. Of course, the terminal 120 can also be a negative terminal, in which case the casing of the cylindrical battery serves as the positive electrode of the cylindrical battery. No specific limitation is made here on the type of terminal 120.
[0063] It should be noted that the first anti-torsion structure 123 being positioned close to the top 122 means that the first anti-torsion structure 123 is adjacent to the top 122, or that the distance between the first anti-torsion structure 123 and the top 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; that is, it can be a single bare cell, two bare cells, or even three or more bare cells. No specific limitations are imposed here.
[0064] It is understood that the battery cell 1000 provided in this embodiment has a mounting hole 111 on the top cover 110 and a through hole 131 on the plastic part 130. The terminal post 120 passes through the mounting hole 111 and the through hole 131 respectively. The plastic part 130 is located at the mounting hole 111 and between the top cover 110 and the terminal post 120. A first anti-torsion structure 123 is provided on the outer peripheral surface of the terminal post 120. At the same time, a second anti-torsion structure 132 is provided 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 cooperate to restrict the rotation of the terminal post 120 relative to the plastic part 130 around its axis 121, so that the terminal post 120 has a higher anti-torsion ability, thereby reducing the possibility of the terminal post 120 loosening or falling off, and thus improving the safety of the battery cell 1000.
[0065] Furthermore, the waist of the pole post is usually a recessed structure, or for composite pole posts, the waist is usually the welding position of the upper pole post and the lower pole post, making it difficult to set an anti-torsion structure. However, in the top cover assembly 100 provided in this embodiment, the first anti-torsion structure 123 is set close to the top 122 of the pole post 120. Compared with other areas of the pole post 120, the outer peripheral surface near the top 122 is easier to process and less difficult to process.
[0066] As shown in Figures 6 to 20, in one embodiment, the first anti-torsion structure 123 includes a plurality of first protrusions 1231 arranged circumferentially along the outer peripheral surface, and the second anti-torsion structure 132 includes a plurality of second recesses 1322 arranged circumferentially along the hole wall, with the plurality of first protrusions 1231 correspondingly embedded in the plurality of second recesses 1322; or the first anti-torsion structure 123 includes a plurality of first recesses 1232 arranged circumferentially along the outer peripheral surface, and the second anti-torsion structure 132 includes a plurality of second protrusions 1321 arranged circumferentially along the hole wall, with the plurality of second protrusions 1321 correspondingly embedded in the plurality of first recesses 1232.
[0067] In this embodiment, the design of the protrusion and the concave part realizes the interlocking between the outer peripheral surface of the pole post 120 and the through hole 131 of the plastic part 130, which effectively restricts the rotation of the pole post 120 and thus improves the torsional resistance of the pole post 120.
[0068] As shown in Figures 11 and 12, in one specific embodiment, the first protrusion 1231 or the first recess 1232 is strip-shaped, and the length direction of the first protrusion 1231 or the first recess 1232 is inclined to the axis 121. This not only restricts the rotation of the pole post 120 relative to the plastic part 130 around its axis 121, but also restricts the displacement of the pole post 120 relative to the plastic part 130 along the direction of its axis 121, thus giving the pole post 120 higher stability.
[0069] As shown in Figures 11 to 14, in one specific embodiment, at least two first protrusions 1231 are adjacent and arranged obliquely to the axis 121; or at least two first recesses 1232 are adjacent and arranged obliquely to the axis 121; or at least two first protrusions 1231 are adjacent and arranged parallel to the axis 121; or at least two first recesses 1232 are adjacent and arranged parallel to the axis 121. This not only restricts the rotation of the pole post 120 relative to the plastic part 130 around its axis 121, but also restricts the displacement of the pole post 120 relative to the plastic part 130 along the direction of its axis 121, thus giving the pole post 120 higher stability.
[0070] As shown in Figures 15 to 17, in one specific embodiment, the first recess 1232 is a circular hole, and the second protrusion 1321 is a cylindrical protrusion. This achieves mutual engagement between the outer peripheral surface of the electrode post 120 and the through hole 131 of the plastic part 130, restricting the rotation of the electrode post 120 relative to the plastic part 130 around its axis 121, thereby improving the torsional resistance of the electrode post 120.
[0071] As shown in Figure 20, in another specific embodiment, the first recess 1232 is a square hole, and the second protrusion 1321 is a square protrusion. This similarly restricts the rotation of the pole post 120 relative to the plastic part 130 around its axis 121, thereby improving the torsional resistance of the pole post 120.
[0072] As shown in Figure 20, furthermore, each pair of adjacent square holes are staggered in the height direction Z, and each pair of adjacent square protrusions are staggered in the height direction Z. By staggering the arrangement of multiple square holes and multiple square protrusions, the square protrusions and square holes can better restrict the rotation of the pole post 120 relative to the plastic part 130 after they engage with each other, thereby improving the torsional resistance of the pole post 120.
[0073] As shown in Figures 18 and 19, in another specific embodiment, the first recess 1232 includes intersecting first grooves 12321 and second grooves 12322. The first groove 12321 extends along the direction of axis 121, and the second groove 12322 extends around axis 121. The second protrusion 1321 includes intersecting first protrusions 13211 and second protrusions 13212. The first protrusions 13211 correspond to the first grooves 12321, and the second protrusions 13212 correspond to the second grooves 12322. That is, multiple first protrusions 13211 are embedded in multiple first grooves 12321, and multiple second protrusions 13212 are embedded in multiple second grooves 12322. Thus, the first groove 12321 and the second groove 12322 intersect to form the horizontal and vertical combination shape shown in Figure 18, and the first protrusion 13211 and the second protrusion 13212 intersect to form the horizontal and vertical combination shape shown in Figure 19. After the two horizontal and vertical combination shapes are engaged with each other, they can better restrict the rotation of the pole post 120 relative to the plastic part 130, thereby improving the torsional resistance of the pole post 120.
[0074] It should be noted that, for the three specific embodiments described above, the first recess 1232 and the second protrusion 1321 can also be other shapes, such as rhombus or ellipse. Since the second protrusion 1321 is embedded in the first recess 1232, it can effectively restrict the rotation of the pole post 120. Therefore, no specific restrictions are placed on the shapes of the first recess 1232 and the second protrusion 1321. Furthermore, the method of staggering adjacent square holes and adjacent square protrusions, as shown in Figure 20, can also be applied to embodiments with circular holes and cylindrical protrusions. Of course, it can also be applied to embodiments with a combination of horizontal and vertical shapes. No specific restrictions are placed on the application scenarios of this staggered arrangement.
[0075] As shown in Figures 21 to 23, in another embodiment, the first anti-torsion structure 123 is a rough layer 1234 with an uneven surface, and the second anti-torsion structure 132 is an adhesive layer 1324 bonded to the rough layer 1234.
[0076] In this embodiment, the roughening layer 1234 can increase the surface roughness of the outer peripheral surface of the pole post 120, and the adhesive layer 1324 can improve the bonding strength between the outer peripheral surface of the pole post 120 and the through hole 131 of the plastic part 130. This can effectively restrict the rotation of the pole post 120 relative to the plastic part 130, thereby improving the torsional resistance of the pole post 120.
[0077] For example, a rough layer 1234 can be formed on the outer peripheral surface of the pole post 120 by means of sanding, polishing, spraying, etc. The adhesive layer 1324 can be an AB glue layer (two-component mixed hardening adhesive), a double-sided adhesive layer, etc., without specific limitations.
[0078] In one embodiment, the battery cell 1000 has a projection plane that is perpendicular to the height direction Z. The orthographic projection shapes of the outer peripheral surface of the electrode post 120 and the hole wall of the through hole 131 on the projection plane are both non-circular.
[0079] It is understandable that by using the non-circular outer circumferential surface of the pole post 120 and the non-circular through hole 131 wall to cooperate, the pole post 120 can be further restricted from rotating relative to the plastic part 130, thereby further improving the torsional resistance of the pole post 120.
[0080] For example, the above-mentioned non-circular shape refers to a shape other than a circle. Non-circular shapes can be ellipses, polygons, etc. Polygons can be further divided into triangles, quadrilaterals, pentagons, hexagons, etc. Quadrilaterals include parallelograms, trapezoids, rectangles, squares, etc. No specific restrictions are placed on the types of non-circular shapes here.
[0081] Secondly, embodiments of this application provide a power battery, including the battery cell 1000 in any of the embodiments of the first aspect described above.
[0082] It should be noted that power batteries are mainly used in electrical devices such as new energy vehicles, energy storage containers, spacecraft, and ships. When applied to new energy vehicles, the power battery can be a battery pack, or more specifically, a battery pack comprising multiple battery modules, each of which includes multiple individual battery cells (1000). Alternatively, the battery pack can consist of multiple individual battery cells (1000), eliminating the module design and placing the battery box containing the multiple individual battery cells (1000) directly into the new energy vehicle (Cell To Pack, CTP technology). Another option is for the power battery to consist of multiple individual battery cells (1000), without using a battery pack form, eliminating the battery module and battery box design, and directly integrating the multiple individual battery cells (1000) into the new energy vehicle (Cell To Chassis, CTC technology).
[0083] It should be understood that, since the power battery provided in this embodiment has the battery cell 1000 in any of the embodiments of the second aspect described above, it has all the beneficial effects of the battery cell 1000, which will not be elaborated here.
[0084] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0085] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.
Claims
1. A battery cell, wherein, Having a height orientation (Z), the battery cell comprises: The housing (200) has a receiving cavity (220) and an opening (210) communicating with the receiving cavity (220); An electrode assembly (300) is disposed within the receiving 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 plate (110), an electrode post (120), and a plastic part (130). The top cover plate (110) covers the opening (210) and has a mounting hole (111) extending therethrough along the height direction (Z). The electrode post (120) is disposed through the mounting hole (111) and electrically connected to the electrode assembly (300). The axis (121) of the electrode post (120) is parallel to the height direction (Z). The electrode post (120) has a top (122) in the height direction (Z) that is away from the top cover plate (110). The electrode post (120) has a surrounding axis (121) The outer peripheral surface of 121) is provided with a first anti-torsion structure (123), which is located near the top (122). The plastic part (130) is located at the mounting hole (111) and between the top cover (110) and the pole (120). The plastic part (130) is provided with a through hole (131), through which the pole (120) passes. The through hole (131) has a hole wall that abuts against the pole (120). 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 restrict the pole (120) from rotating relative to the plastic part (130) around the axis (121).
2. The battery cell according to claim 1, wherein, The first anti-torsion structure (123) includes a plurality of first protrusions (1231), which are arranged circumferentially along the outer peripheral surface. The second anti-torsion structure (132) includes a plurality of second recesses (1322), which are arranged circumferentially along the hole wall. The plurality of first protrusions (1231) are correspondingly embedded in the plurality of second recesses (1322).
3. The battery cell according to claim 2, wherein, The first protrusion (1231) is strip-shaped, and the length direction of the first protrusion (1231) is inclined to the axis (121).
4. The battery cell according to claim 2, wherein, At least two of the first protrusions (1231) are adjacent and arranged in an angle inclined to the axis (121).
5. The battery cell according to claim 2, wherein, At least two of the first protrusions (1231) are adjacent and arranged in a direction parallel to the axis (121).
6. The battery cell according to claim 1, wherein, The first anti-torsion structure (123) includes a plurality of first recesses (1232), which are arranged circumferentially along the outer peripheral surface. The second anti-torsion structure (132) includes a plurality of second protrusions (1321), which are arranged circumferentially along the hole wall, and the plurality of second protrusions (1321) are correspondingly embedded in the plurality of first recesses (1232).
7. The battery cell according to claim 6, wherein, The first recess (1232) is strip-shaped, and the length direction of the first recess (1232) is inclined to the axis (121).
8. The battery cell according to claim 6, wherein, At least two of the first recesses (1232) are adjacent and arranged in an angle inclined to the axis (121).
9. The battery cell according to claim 6, wherein, At least two of the first recesses (1232) are adjacent and arranged in a direction parallel to the axis (121).
10. The battery cell according to claim 6, wherein, The first recess (1232) includes a first groove (12321) and a second groove (12322) that intersect each other. The first groove (12321) extends along the direction of the axis (121), and the second groove (12322) extends around the axis (121). The second protrusion (1321) includes a first protrusion (13211) and a second protrusion (13212) that intersect each other. The first protrusion (13211) corresponds to the first groove (12321), and the second protrusion (13212) corresponds to the second groove (12322).
11. The battery cell according to claim 6, wherein, The first recess (1232) is a circular hole, and the second protrusion (1321) is a cylindrical protrusion.
12. The battery cell according to claim 6, wherein, The first recess (1232) is a square hole, and the second protrusion (1321) is a square protrusion.
13. The battery cell according to claim 12, wherein, Each pair of adjacent square holes is staggered in the height direction (Z), and each pair of adjacent square protrusions is staggered in the height direction (Z).
14. The battery cell according to claim 1, wherein, The first anti-torsion structure (123) is a rough layer (1234) with an uneven surface, and the second anti-torsion structure (132) is an adhesive layer (1324) bonded to the rough layer (1234).
15. The battery cell according to claim 14, wherein, The adhesive layer (1324) is an AB adhesive layer or a double-sided adhesive layer.
16. The battery cell according to claim 1, wherein, The battery cell has a projection plane that is perpendicular to the height direction (Z). The orthographic projections of the outer peripheral surface and the hole wall onto the projection plane are both non-circular.
17. The battery cell according to claim 16, wherein, The non-circular shape is either elliptical or polygonal.
18. The battery cell according to claim 1, wherein, The battery cell is a square battery, and the terminal (120) includes a positive terminal and a negative terminal, which are respectively inserted into the top cover plate (110).
19. The battery cell according to claim 1, wherein, The battery cell is a cylindrical battery, the terminal (120) is a positive terminal to serve as the positive electrode of the cylindrical battery, and the casing (200) serves as the negative electrode of the cylindrical battery.
20. A power battery, wherein, Includes the battery cell according to any one of claims 1 to 19.