Battery and top cover assembly thereof

Abstract

The utility model discloses a battery and a top cover assembly thereof, the top cover assembly comprises a pole, a gasket and upper plastic cement, the peripheral side of the pole is provided with a first flange; the gasket is sleeved outside the pole, and at least part of the gasket is positioned below the first flange; the upper plastic sleeve is arranged outside the post terminal and is at least partially positioned below the gasket; and the gasket is gradually inclined from the annular inner side edge to the annular outer side edge to the direction farther away from the bottom surface of the post terminal. In the top cover assembly, through the gasket with the non-planar structure and the radial half inclined arrangement, the sealing performance of the periphery of the pole can be improved, the resistance for resisting deformation and a certain buffer space can be provided, the problems of cracking, liquid leakage, sealing failure and the like at the connecting part of the pole can be weakened and even avoided, and the influence of thermal expansion of the battery on the internal structure of the battery cell can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy, in particular to a battery and a top cover component thereof. Background Art

[0002] Against the backdrop of global energy conservation, emission reduction and sustainable development, the replacement of fossil energy with new energy has become a popular demand. Currently, new energy technologies have been widely used in the fields of automobiles, heavy trucks, agricultural drones, power tools, etc.

[0003] Power batteries have the characteristics of high energy density, long cycle life, no memory effect and environmental friendliness, and are widely used in plug-in hybrid electric vehicles, hybrid electric vehicles and pure electric vehicles. Energy storage batteries are mainly used in solar power generation equipment, wind power generation equipment and power storage systems for renewable energy storage.

[0004] The chemical reactions during the charging and discharging process of the battery cell will produce gas and heat. The accumulation of these gases and the temperature rise will increase the internal pressure of the battery cell, causing the battery cell to expand, leading to cracks at the pole connections, leakage, and sealing failure, which will have an adverse effect on the internal structure of the battery cell.

[0005] Therefore, how to reduce or even avoid the above-mentioned battery cell expansion causing cracking, leakage, sealing failure at the pole connection, and adverse effects on the internal structure of the battery cell is a technical problem that needs to be urgently solved by technical personnel in this field. Utility Model Content

[0006] In view of this, the purpose of the utility model is to provide a battery and a top cover assembly thereof, which, through a non-planar structure and a gasket inclined in a radial half-section, can provide resistance to deformation and a certain buffer space, reduce or even avoid problems such as cracking, leakage, and sealing failure at the pole connection, and reduce the influence of thermal expansion of the battery on the internal structure of the battery cell.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A top cover assembly comprises a pole, a gasket and an upper plastic, wherein a first flange is arranged on the circumferential side of the pole; the gasket is sleeved outside the pole and at least partially located below the first flange; the upper plastic is sleeved outside the pole and at least partially located below the gasket; the gasket is gradually inclined from the annular inner side edge to the annular outer side edge in a direction further away from the bottom surface of the pole.

[0009] Optionally, in the longitudinal section of the pole:

[0010] An angle A1 between a first contact surface between the bottom surface of the first flange and the upper surface of the gasket and a cross section of the pole is greater than zero, and an outer end of the first contact surface is further away from the bottom surface of the pole than an inner end;

[0011] and / or,

[0012] An angle A2 between a second contact surface between the lower surface of the gasket and the upper plastic and a cross section of the pole is greater than zero, and an outer end of the second contact surface is further away from the bottom surface of the pole than an inner end.

[0013] Optionally, 0≤A1≤60°, and / or, 0≤A2≤60°.

[0014] Optionally, it also includes a top cover sheet and a sealing ring; the top cover sheet is provided with a first mounting hole penetrating the upper and lower surfaces of the top cover sheet, and the pole passes through the first mounting hole; the upper plastic portion extends into the first mounting hole, and is partially located between the gasket and the top cover sheet; a second flange is also provided on the peripheral side of the pole, and the first flange and the second flange are respectively located on the upper and lower sides of the top cover sheet; the sealing ring is sleeved outside the pole, and is at least partially located between the side wall of the first mounting hole and the pole.

[0015] Optionally, it also includes a lower plastic; a first sink is provided on the bottom surface of the top cover sheet around the radial outer side of the first mounting hole; the lower plastic is provided with a second mounting hole penetrating the upper and lower surfaces of the lower plastic, and a first boss located on the top surface of the lower plastic; the pole passes through the second mounting hole, and the first boss is located in the first sink.

[0016] Optionally, a second sink is provided on the bottom surface of the lower plastic, and the second flange is located in the second sink.

[0017] Optionally, one or more third sinks are arranged at the bottom of the lower plastic around the circumference of the second sink.

[0018] Optionally, one or more fourth sinks are arranged on the bottom surface of the top cover sheet in a circumferential direction around the first sink.

[0019] Optionally, a second boss is provided on the upper surface of the top cover sheet, and a projection of the first recessed platform on the upper surface of the top cover sheet is located within a top surface region of the second boss.

[0020] Optionally, the upper plastic is provided with at least one protruding portion on the bottom surface that contacts the upper surface of the top cover sheet; the upper surface of the top cover sheet is provided with at least one sunken concave groove radially outward of the first mounting hole; and the protruding portion is at least partially located in the sunken concave groove.

[0021] Optionally, the protrusion at the positive electrode of the top cover assembly and the protrusion at the negative electrode have different shapes; and / or, the protrusion is located at the injection port and welding area of ​​the upper plastic.

[0022] A battery comprises a shell, a battery cell located in the shell, and a top cover assembly located at an end of the shell, wherein the top cover assembly is the top cover assembly described above.

[0023] It can be seen from the above technical scheme that in the battery and its top cover assembly provided by the utility model, since the gasket is gradually inclined from the inner side of the ring to the outer side of the ring in a direction further away from the bottom surface of the pole, the upper and lower surfaces of the gasket are non-planar structures. Therefore, compared with a flat ring gasket of the same diameter, the contact area between the upper surface of the gasket and the first flange, as well as the contact area between the lower surface of the gasket and the upper plastic can be increased, thereby facilitating the sealing of the connection position. Moreover, when the battery cell expands due to the increase in internal pressure, the gasket with a non-planar structure and an inclined radial semi-section can provide resistance to deformation and a certain buffer space, thereby reducing or even avoiding cracking, leakage, and sealing failure at the pole connection, and reducing the influence of battery thermal expansion on the internal structure of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A schematic diagram of the explosion structure of a battery cell provided in an embodiment of the utility model.

[0026] Figure 2 A schematic diagram of the exploded structure of the top cover assembly and shell of the battery cell provided in an embodiment of the utility model.

[0027] Figure 3 An axial cross-sectional view of a battery cell at the pole position provided in an embodiment of the utility model.

[0028] Figure 4 for Figure 3 A magnified view of a local area.

[0029] Figure 5 and Figure 6 They are respectively an axonometric view and a front view of the bottom structure of a lower plastic provided with a second sinking platform and a third sinking platform provided in an embodiment of the utility model.

[0030] Figure 7 and Figure 8 They are respectively an axonometric view and a cross-sectional view of a pole provided in an embodiment of the utility model.

[0031] Fig. 9A schematic diagram of the top structure of a top cover sheet provided with a first sinking platform provided in an embodiment of the utility model. ( Fig. 9 The dotted line in the figure indicates the edge line of the second boss.

[0032] Fig.10 A schematic diagram of the bottom structure of a top cover sheet provided with a first sinking platform provided in an embodiment of the utility model. ( Fig. 9 The hatched area in the figure represents the bottom surface of the groove of the first sink.

[0033] Fig.11 A schematic diagram of the bottom structure of another top cover plate provided with a first sinking platform and a fourth sinking platform provided in an embodiment of the utility model.

[0034] Fig.12 and Fig.13 They are respectively an axonometric view and a cross-sectional view of a plastic upper provided in an embodiment of the utility model.

[0035] Fig.14 and Fig.15 They are respectively a schematic diagram of the top structure and a schematic diagram of the bottom structure of another upper plastic provided with a protrusion provided in an embodiment of the utility model.

[0036] Fig.16 A schematic diagram of the top structure of another top cover sheet provided with a sunken terrace-shaped slot provided in an embodiment of the utility model.

[0037] in:

[0038] 1-top cover, 2-pole, 3-gasket, 4-upper plastic, 5-sealing ring, 6-lower plastic,

[0039] 7-explosion-proof valve, 8-protection sheet, 9-aluminum shell,

[0040] 11-first mounting hole, 12-first boss, 13-first sink, 14-fourth sink,

[0041] 15-sunken slot,

[0042] 21- first flange, 22- second flange,

[0043] 31- annular inner side, 32- annular outer side, 41- raised part,

[0044] 61-second mounting hole, 62-first boss, 63-second sink, 64-third sink,

[0045] N1-thickness of the first flange of the pole, N2-thickness of the second flange of the pole. DETAILED DESCRIPTION

[0046] The utility model discloses a battery and a top cover assembly thereof, which can increase the sealing around the pole through a non-planar structure and a gasket with a radial semi-section inclined, and can provide resistance to deformation and a certain buffer space, reduce or even avoid problems such as cracking, leakage, and sealing failure at the connection of the pole, and reduce the influence of thermal expansion of the battery on the internal structure of the battery core.

[0047] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0048] See also Figures 1 to 4 The top cover assembly provided by the embodiment of the utility model includes a pole 2, a gasket 3, and an upper plastic 4, wherein: a first flange 21 is provided on the peripheral side of the pole 2; the gasket 3 is annularly sleeved outside the pole 2, at least partially located below the first flange 21, and gradually tilted from the annular inner side edge 31 to the annular outer side edge 32 in a direction further away from the bottom surface S3 of the pole; the upper plastic 4 is annularly sleeved outside the pole 2, and at least partially located below the gasket 3.

[0049] It should be noted that the annular inner side 31 and the annular outer side 32 of the gasket 3 refer to the radial inner side and the radial outer side of the annular structure, respectively, and the pole bottom surface S3 refers to the end surface of the pole 2 located on the inner side of the top cover sheet 1 and close to the inner pole piece of the battery cell. Figure 3 and Figure 4 : In the longitudinal section where the central axis of the pole 2 is located, the radial half section of the gasket 3 (i.e. Figure 4 In the cross section of the gasket 3 in the middle, the side close to the pole 2 is the above-mentioned annular inner side 31, and the side away from the pole 2 is the above-mentioned annular outer side 32. In addition, the radial semi-section of the gasket 3 presents a shape that gradually tilts from the radial inner side to the radial outer side in a direction further away from the bottom surface S3 of the pole. Thus, the upper annular end face of the gasket 3 is a concave (i.e., the annular inner side is concave relative to the annular outer side, or the annular outer side is warped upward relative to the annular inner side) non-planar structure, and at the same time, the lower annular end face of the gasket 3 is a convex (i.e., the annular inner side is convex relative to the annular outer side, or the annular outer side is warped upward relative to the annular inner side) non-planar structure.

[0050] It can be seen that in the top cover assembly, since the upper and lower surfaces of the gasket 3 are both non-planar structures, the contact area between the upper surface of the gasket 3 and the first flange 21, as well as the contact area between the lower surface of the gasket 3 and the upper plastic 4 can be increased relative to a flat annular gasket of the same diameter, thereby facilitating the sealing of the connection position. Moreover, when the battery cell expands due to the increase in internal pressure, the gasket 3 with a non-planar structure and an inclined radial semi-section can provide resistance to deformation and a certain buffer space, thereby reducing or even avoiding problems such as cracking, leakage, and sealing failure at the pole connection, and reducing the impact of battery thermal expansion on the internal structure of the battery cell.

[0051] When implementing it, Figure 4 As shown in , the pole cross section S0 is parallel to the plane where the top cover sheet 1 is located, and the angle A between the radial semi-section of the gasket 3 and the pole cross section S0 is greater than zero. Since the thickness of the gasket 3 is generally uniform, in the longitudinal section of the pole 2: the angle A1 between the first contact surface S1 between the bottom surface of the first flange 21 and the upper surface of the gasket 3 and the pole cross section S0 is greater than zero, and the outer end of the first contact surface S1 is further away from the pole bottom surface S3 relative to the inner end; and / or, the angle A2 between the second contact surface S2 between the lower surface of the gasket 3 and the upper plastic 4 and the pole cross section S0 is greater than zero, and the outer end of the second contact surface S2 is further away from the pole bottom surface S3 relative to the inner end. Preferably, 0≤A1≤60°, and / or, 0≤A2≤60°. When A is too large, the inclination angle of the contact surface between the gasket 3 and the upper plastic 4 (i.e., the second contact surface S2) is too large, and the axial force is small, which can easily cause the pole 2 to slip from the first mounting hole 11 of the top cover plate 1; when A is too small, the upper plastic 4 will be subjected to greater pressure, which can easily cause the upper plastic 4 to crack.

[0052] See also Figure 1 and Figure 3 In some embodiments, the top cover assembly further includes a top cover sheet 1 and a sealing ring 5. The top cover sheet 1 is provided with a first mounting hole 11 penetrating the upper and lower surfaces of the top cover sheet 1, and the pole 2 is provided in the first mounting hole 11; the upper plastic 4 partially extends into the first mounting hole 11, and is partially located between the gasket 4 and the top cover sheet 1; a second flange 22 is also provided on the peripheral side of the pole 2, and the first flange 21 and the second flange 22 are respectively located on the upper and lower sides of the top cover sheet 1; the sealing ring 5 is sleeved outside the pole 2, and is at least partially located between the side wall of the first mounting hole 11 and the pole 2, for example Figure 3As shown in , the sealing ring 5 is partially located in the first mounting hole 11 of the top cover sheet 1, and partially located between the top cover sheet 1 and the second flange 22. Moreover, the sealing ring 5 is elastic and can squeeze the upper plastic 4 upward when the battery cell expands, thereby transmitting some force to the gasket 3, so as to achieve the purpose of buffering the expansion of the battery cell. Specifically, when the battery cell expands, the second flange 22 at the bottom of the pole 2 squeezes the sealing ring 5, and the upper plastic 4 can be squeezed upward by the elasticity of the sealing ring 5, and then the force is transmitted to the gasket 3. At this time, the gasket 3 and the upper plastic 4 and / or the gasket 3 and the first flange 21 may slide relative to each other along the inclined contact surface or have a tendency to slide relative to each other, so that the expansion of the battery cell can be buffered by any one of the friction between the gasket 3 and the upper plastic 4, the friction between the gasket 3 and the first flange 21, the deformation of the gasket 3, or multiple factors.

[0053] Furthermore, the top cover assembly is also provided with a lower plastic 6. Part of the outer area of ​​the first mounting hole 11 of the top cover sheet 1 is located below the upper plastic 4, the bottom inner side of the upper plastic 4 extends into the first mounting hole 11, and the lower plastic 6 is closer to the bottom surface S3 of the pole than the upper plastic 4.

[0054] When assembling the top cover sheet 1, pole 2 and lower plastic 6 into the top cover assembly, it is difficult to accurately position the pole 2 due to the large number of assembled parts. Even when the pole 2 is riveted by the flange structure (i.e., the second flange 22 and the first flange 21), the position of the pole 2 is still prone to deviation, resulting in uneven flange and poor flange positioning effect, which in turn leads to the following problems: ① The actual axial force area of ​​the pole flange is small, and the flange deformation will occur when it is subjected to a small push and pull force, and then the sealing ring 5 rebounds, resulting in sealing failure, leakage and other risks, and even the risk of the pole falling off. ② The flatness of the upper surface of the pole flange is poor, resulting in uneven compression of the sealing ring 5, overpressure in some places, and insufficient compression in some places. During long-term use, the sealing ring 5 will fail to seal locally, resulting in the risk of leakage. ③ The height fluctuation of the pole flange increases. When the pole flange height is small, the upper plastic 4 will be over-pressurized, resulting in cracking and short circuit risk of the upper plastic 4; when the pole flange height is large, the flange may be higher than the upper surface of the pole, affecting the fit between the upper surface of the pole and the busbar, which may easily cause poor welding problems such as busbar cold welding during welding, affecting the overcurrent and resistance of the battery pack. ④ A large number of metal chips are generated during flanging, and the metal chips may fall into the battery cell during production, causing the battery cell to be short-circuited and scrapped. ⑤ The pole flange is uneven. When the flanging riveting die is stamped, the part with greater deformation bears greater flanging pressure, greater hardness, and greater internal stress; the part with less deformation bears less flanging pressure, less hardness, and less stress. Because the internal stress and hardness of the flanging are uneven and have a large difference, the flanging may be wrinkled or wavy. ⑥ Deviation in the pole position during flanging may cause the pole center distance to exceed the tolerance, making the pole and the top cover pole hole non-coaxial, affecting the welding of the pole bottom and the winding core ear and the welding of the pole top and the busbar.

[0055] Therefore, see Fig. 9 and Fig.10 A first sink 13 is provided on the bottom surface of the top cover sheet 1 around the radial outer side of the first mounting hole 11; see Figure 5 and Figure 6 The lower plastic 6 is provided with a second mounting hole 61 penetrating the upper and lower surfaces of the lower plastic, and a first boss 62 located on the top surface of the lower plastic. The first boss 62 is arranged around the circumference of the second mounting hole 61. Figures 1 to 4, the pole 2 is arranged through the second mounting hole 61 of the lower plastic 6 and the first mounting hole 11 of the top cover sheet 1, and the first boss 62 of the lower plastic 6 is located in the first sink 13 of the top cover sheet 1. Furthermore, a second sink 63 is arranged on the bottom surface of the lower plastic 6 at a position corresponding to the first boss 62, so as to form a convex structure on the lower plastic 6, and the second flange 22 radially outward of the bottom of the pole 2 is located in the second sink 63. It can be seen that the first boss 62 can reserve space for the positioning of the pole, so that the pole is accurately positioned and the flanging effect is ensured, thereby achieving the effects of increasing the push-pull force of the pole, improving the flatness of the upper surface of the pole flanging, stabilizing the height of the pole flanging, reducing metal chips, ensuring uniform flanging, and reducing the error of the pole center distance.

[0056] For further information, see Figures 5 to 8 In some embodiments, one or more third sinkers 64 are arranged around the circumference of the second sinker 63 at the bottom of the lower plastic 6. Specifically, assuming that the length of each third sinker 64 is L1, the width is L2, the depth is L3, and the thickness of the lower plastic 6 is L4, then 50mm≥L1≥0.5mm, 10mm≥L2≥0.5mm, 2mm≥L3≥0mm, and 0.6≥L3 / L4≥0.1. When L3 / L4<0.1, the thickness of the bottom of the third sinker 64 is too thin to meet the insulation requirements. At the same time, the injection molding of the lower plastic here is more difficult, and there may be missing glue and holes; when L3 / L4>0.6, the thickness of the bottom of the third sinker 64 is too thick, which increases the cost. Moreover, when the size of the sinker is too small, it cannot play the role of reserving space for positioning the pole 2; when the size of the sinker is too large, the strength of the lower plastic 6 or the top cover sheet 1 at the pole 2 will be too small.

[0057] See also Fig.11 In some embodiments, one or more fourth sinkers 14 are circumferentially arranged on the bottom surface of the top cover sheet 1 around the first sinker 13, so as to ensure that the groove wall of the first sinker 13 can be better formed when the first sinker 13 is cold headed.

[0058] See also Fig. 9 and Fig.10 In some embodiments, a second boss 12 is provided on the upper surface of the top cover sheet 1, and a projection of the first sink 13 on the upper surface of the top cover sheet is located within the top surface area of ​​the second boss 12, that is, Fig. 9The area enclosed by the edge line of the second boss 12 shown by the dotted line in FIG. Thus, a top cover convex structure is formed on the top cover sheet 1. Through the top cover convex structure, the internal space of the battery cell can be increased while achieving the buffering of battery cell expansion, so that the size of the bare battery cell is correspondingly increased and the active material is increased, thereby achieving the purpose of improving the energy density. Moreover, through the top cover convex structure, more space can be reserved for the inside of the battery cell, and the volume of the winding core can be made larger under the same battery cell shape, thereby improving the energy density of the battery cell; in addition, the heat dissipation area between the battery cell pole area and the outside world can be increased, and the part with the highest temperature during the battery charging and discharging process is the pole area, so it is more conducive to the heat dissipation of the battery cell, reducing the risk of local high temperature, and ensuring that the maximum temperature of the battery cell is within the safety standard.

[0059] Specifically, see Figure 3 Assuming that the height of the raised portion of each second boss 12 is D1, the thickness of the top cover sheet 1 is D2, the depth of the groove of the first sink 13 is D3, and the table thickness of the first sink 13 (i.e., the plate thickness of the top cover sheet 1 near the side of the pole 2) is D4, the following relationship is satisfied: D4 ≥ 0.5 mm, ensuring that the thickness D4 of the top cover sheet 1 at the pole 2 is not too small, thereby ensuring its strength; 3 mm ≥ D1 ≥ 0.1 mm, ensuring that the second boss 12 has a certain height, thereby increasing the thickness D4 of the top cover sheet 1 at the pole 2, thereby ensuring the axial push-pull strength of the top cover sheet 1, and preventing the second boss 12 from protruding too high and occupying the top space of the battery cell; the generally more economical process is to stamp the groove structure of the first sink 13 and the protrusion structure of the second boss 12, and extrude the aluminum material at the groove of the first sink 13 to the protrusion of the second boss 12. To ensure that the protrusion is well formed, it is necessary to ensure 2 ≥ D3 ≥ D1 ≥ 0.1. When D1<0.1, the protrusion height of the second boss 12 is too small and has almost no effect; when D3>2, the groove depth of the first sink 13 is too large, which increases the manufacturing difficulty and cost of the top cover sheet 1 and is not convenient for welding the bottom of the pole 1 to the connecting sheet. In addition, please refer to Fig. 9 The thickness of the first flange 21 of the pole 2 is N1,2≥N1 / D3≥0.2, thereby improving the internal energy density of the battery cell and providing sufficient buffer space when the battery cell expands.

[0060] See also Fig.15 and Fig.16 In some embodiments, the bottom surface of the upper plastic 4 that contacts the upper surface of the top cover sheet 1 is provided with at least one protrusion 41; correspondingly, the upper surface of the top cover sheet 1 is provided with at least one recessed groove 15 radially outward of the first mounting hole 11. The protrusion 41 is at least partially located in the recessed groove 15, and the two cooperate with each other to play a role in preventing twisting. In order to ensure sufficient anti-twist effect, it is preferred that the protrusion 41 protrudes radially outward relative to the circumferential side wall of the upper plastic 4. In addition, please refer to Fig.14 The top of the protrusion 41 is a planar structure, which is flush with the top of the annular side wall of the upper plastic 4 located outside the gasket 3, and protrudes radially outward relative to the annular side wall.

[0061] Furthermore, in some embodiments, the convex portion 41 of the positive electrode plastic at the positive electrode of the top cover assembly and the negative electrode plastic at the negative electrode have different shapes, and the corresponding top cover sheet has different shapes of the sunken platform-shaped slots 15 at the positive and negative electrodes, so as to ensure that the positive and negative electrodes are not installed upside down, thus playing a fool-proof role. Fig.16 As shown in the figure, the sunken terrace-shaped slot 15 at the positive electrode of the top cover sheet 1 is a trapezoidal opening structure with a wide outside and a narrow inside, and the sunken terrace-shaped slot 15 at the negative electrode is a trapezoidal opening structure with a narrow outside and a wide inside; correspondingly, the raised portion 41 of the plastic on the positive electrode is a trapezoidal structure with a wide outside and a narrow inside, and the raised portion 41 of the plastic on the negative electrode is a trapezoidal structure with a narrow outside and a wide inside. However, it is not limited to this. In other embodiments, the sunken terrace-shaped slot 15 and the raised portion 41 can also be designed to be other shapes, as long as the above-mentioned anti-twist and anti-fool functions can be achieved.

[0062] In specific implementation, it is preferred to arrange the protrusion 41 of the upper plastic 4 at the injection port and the welding area of ​​the upper plastic 41. The injection port and the welding area of ​​the upper plastic 4 are generally weak areas and are prone to cracking after being squeezed. Therefore, arranging the protrusion 41 in this area can improve the structural strength of the area and reduce the risk of cracking.

[0063] In some embodiments, the projection of the first flange 21 of the pole 2 on the upper surface of the top cover sheet 1 is located in the upper surface area of ​​the second boss 12 of the top cover sheet 1, which can ensure that the top of the pole 2 has a sufficient force-bearing area and does not hang in the air. Moreover, in some embodiments, the projection of the second flange 22 of the pole 2 on the lower surface of the top cover sheet 1 is located in the groove-shaped first sink 13, and the distance D5 between the second flange 22 and the side wall of the first sink 13 is not less than 0.2mm, that is, D5 ≥ 0.2mm, which can ensure that the pole 2 and the first sink 13 have enough space to place the lower plastic 6 and other insulators, thereby ensuring the insulation of the pole 2 and the top cover sheet 1.

[0064] In some embodiments, the distance between the upper surface of the second flange 22 of the pole 2 and the lower surface of the top cover sheet 1 is greater than zero, or the distance that the upper surface of the second flange 22 of the pole 2 extends into the first sink 13 of the top cover sheet 1 is greater than zero, which can ensure that there is a sufficient force-bearing area between the pole 2 and the top cover sheet 1, rather than relying solely on the strength of the lower plastic 6 to stop torsion, thereby ensuring that the pole 2 has sufficient torsional resistance.

[0065] In some embodiments, the thickness of the first flange 21 of the pole 2 is N1, 3mm≥N1≥0.5mm, which can ensure that the top of the pole has sufficient strength to withstand the axial thrust;

[0066] The thickness of the second flange 22 of the pole 2 is N2, 3mm≥N2≥0.5mm. Among them, N2≥0.5mm can ensure that the bottom of the pole has sufficient strength to prevent the bottom of the pole from deforming when subjected to axial tension; 3mm≥N2 can avoid the bottom of the pole being too thick, resulting in cost waste and reducing the weight and energy density of the battery cell.

[0067] The embodiment of the utility model also provides a battery, which includes a shell 9, a battery cell and the top cover assembly mentioned above. The battery cell is located in the shell 9, the top cover assembly is located at the end of the shell 9, and the lower plastic 6 in the top cover assembly is installed at the port of the shell 9. In addition, the top cover sheet 1 and the lower plastic 6 are also provided with injection holes correspondingly, and the top cover sheet 1 is provided with an explosion-proof valve 7 and a protective sheet 8, the explosion-proof valve 7 is installed in the installation hole of the top cover sheet 1, and the protective sheet 8 is located on the outside of the explosion-proof valve 7. Moreover, the shell 9 is generally an aluminum shell, and the gasket 3 is a metal gasket.

[0068] It should be noted that, in specific implementation, the relative positions of the various components and their related devices, equipment, and partial areas provided in this application are bound to be different in different scenes and different viewing angles, but they should be able to remain consistent when adjusted to the same placement direction as the drawings in the specification of this application. Therefore, for the convenience of explanation, the directions such as "above", "below", "top", "top surface", "bottom", and "bottom surface" mentioned in this article are based on the directions and relative positions in the corresponding drawings in the specification, and are not limited to the actual directions in specific implementation.

[0069] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0070] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0071] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A top cover assembly, comprising a pole (2), a gasket (3), and an upper plastic (4), characterized in that: A first flange (21) is provided on the peripheral side of the pole (2); The gasket (3) is sleeved outside the pole (2) and is at least partially located below the first flange (21); The upper plastic (4) is sleeved outside the pole (2) and is at least partially located below the gasket (3); The gasket (3) is gradually inclined from the annular inner side edge (31) to the annular outer side edge (32) in a direction further away from the bottom surface (S3) of the pole.

2. The top cover assembly according to claim 1, characterized in that: In the longitudinal section of the pole (2): An angle A1 between a first contact surface (S1) between the bottom surface of the first flange (21) and the upper surface of the gasket (3) and the pole cross section (S0) is greater than zero, and an outer end of the first contact surface (S1) is further away from the pole bottom surface (S3) than an inner end; and / or, An angle A2 between a second contact surface (S2) between the lower surface of the gasket (3) and the upper plastic (4) and the pole cross section (S0) is greater than zero, and an outer end of the second contact surface (S2) is further away from the pole bottom surface (S3) than an inner end.

3. The top cover assembly according to claim 2, characterized in that: 0≤A1≤60°, and / or, 0≤A2≤60°.

4. The top cover assembly according to claim 1, characterized in that: It also includes a top cover sheet (1) and a sealing ring (5): The top cover sheet (1) is provided with a first mounting hole (11) penetrating the upper and lower surfaces of the top cover sheet, and the pole (2) penetrates the first mounting hole (11); the upper plastic (4) partially extends into the first mounting hole (11), and is partially located between the gasket (3) and the top cover sheet (1); A second flange (22) is also provided on the peripheral side of the pole (2), and the first flange (21) and the second flange (22) are respectively located on the upper and lower sides of the top cover sheet (1); The sealing ring (5) is sleeved outside the pole (2) and is at least partially located between the side wall of the first mounting hole (11) and the pole (2).

5. The top cover assembly according to claim 4, characterized in that: Also includes the lower plastic (6): A first sink (13) is provided on the bottom surface of the top cover sheet (1) surrounding the radial outer side of the first mounting hole (11); The lower plastic (6) is provided with a second mounting hole (61) penetrating the upper and lower surfaces of the lower plastic, and a first boss (62) located on the top surface of the lower plastic; the pole (2) penetrates the second mounting hole (61), and the first boss (62) is located in the first sink (13).

6. The top cover assembly according to claim 5, characterized in that: A second sink (63) is provided on the bottom surface of the lower plastic (6), and the second flange (22) is located inside the second sink (63).

7. The top cover assembly according to claim 6, characterized in that: One or more third sinks (64) are arranged at the bottom of the lower plastic (6) around the circumference of the second sink (63).

8. The top cover assembly according to claim 5, characterized in that: One or more fourth sinks (14) are circumferentially arranged on the bottom surface of the top cover sheet (1) around the first sink (13).

9. The top cover assembly according to claim 5, characterized in that: The upper surface of the top cover sheet (1) is provided with a second boss (12), and the projection of the first sink (13) on the upper surface of the top cover sheet is located within the top surface area of ​​the second boss (12).

10. The top cover assembly according to any one of claims 4 to 9, characterized in that: The bottom surface of the upper plastic (4) for contacting the upper surface of the top cover sheet (1) is protrudingly provided with at least one protruding portion (41); The upper surface of the top cover sheet (1) is provided with at least one recessed groove (15) on the radially outer side of the first mounting hole (11); The protruding portion (41) is at least partially located in the recessed table-shaped groove (15).

11. The top cover assembly according to claim 10, characterized in that: The protrusion (41) at the positive electrode of the top cover assembly and the protrusion (41) at the negative electrode have different shapes; And / or, the protrusion (41) is located at the plastic inlet and welding area of ​​the upper plastic (4).

12. A battery, comprising a housing (9), a battery cell located in the housing (9) and a top cover assembly located at an end of the housing (9), characterized in that: The top cover assembly is the top cover assembly according to any one of claims 1 to 11.

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