Top cover assembly, battery and battery pack

Abstract

This utility model relates to the field of batteries, and discloses a top cover assembly, a battery, and a battery pack. The top cover assembly includes: a cover plate with a through stepped hole, the stepped hole including a mounting hole and an injection hole with cross-sections decreasing in size, the mounting hole wall having a mating part; a limiting member, detachably disposed in the mounting hole, the limiting member having a locking part on its outer periphery, and the mating part axially limiting or releasing the locking part during the rotation of the limiting member, the end face of the limiting member opposite to the injection hole having a recessed screwing part for engaging with a screwing tool; and a sealing member, at least partially disposed in the mounting hole, and the limiting member compressing the sealing member when the mating part axially limits the locking part. This solution, by using a detachable limiting member in conjunction with a sealing member, replaces the laser welding sealing process, fundamentally avoiding defects such as the heat-affected zone, uneven material melting, and porosity formation during the welding process, significantly improving the reliability and consistency of the sealing.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a top cover assembly, a battery, and a battery pack. Background Technology

[0002] After the electrolyte filling process, the filling port of the secondary battery needs to be sealed to isolate the cell from the external environment, forming a sealed electrochemical system to prevent electrolyte leakage and the intrusion of external impurities, thus ensuring battery performance and safety.

[0003] Currently, the laser welding process for sealing aluminum nails is widely used due to its ease of operation and high efficiency. However, the laser welding effect is affected by factors such as the cleanliness of the injection port, laser parameters, and the shape of the aluminum nail, which can easily lead to problems such as cracks, bursts, or pinholes in the weld. Utility Model Content

[0004] In view of this, the present invention provides a top cover assembly, a battery and a battery pack to solve or improve the problems that laser welding effect is affected by the cleanliness of the injection port, laser parameters and the shape of the aluminum nail, which can easily lead to cracks, bursts or pinholes in the weld.

[0005] In a first aspect, this utility model provides a top cover assembly, comprising: The cover plate has a through stepped hole, the stepped hole including a mounting hole and an injection hole with the cross-section decreasing from large to small, and the wall of the mounting hole is provided with a mating part; A limiting member is detachably provided in the mounting hole. The outer periphery of the limiting member is provided with a locking part. During the rotation of the limiting member, the mating part can axially limit or release the locking part. The end face of the limiting member opposite to the injection hole is provided with a recessed screwing part for engaging with a screwing tool. A seal is provided at least partially in the mounting hole, and the limiting member presses against the seal while the mating part axially limits the engaging part.

[0006] In one optional embodiment, the screwing part includes a polygonal hole, which is coaxially arranged with the limiting member; Alternatively, the screwing part includes at least two locking holes, which are spaced apart circumferentially along the limiting member.

[0007] In one optional embodiment, the cover plate is a rectangular plate with a length of 100mm to 150mm and a width of 35mm to 50mm. And / or, the thickness of the cover plate is 2mm~3mm; And / or, the depth of the mounting hole is 5mm~7mm, and the diameter of the mounting hole is 9mm~11mm; And / or, the depth of the injection hole is 2mm~3mm, and the diameter of the injection hole is 4mm~5mm; And / or, the surface of the cover plate is provided with a positive electrode post and a negative electrode post, and the mounting hole and the liquid injection hole are located between the positive electrode post and the negative electrode post.

[0008] In one optional embodiment, the cover plate has a first surface and a second surface facing away from each other. The first surface is provided with a protrusion that protrudes along the thickness direction of the cover plate. The mounting hole is located on the second surface opposite to the protrusion and is recessed into the protrusion. The injection hole penetrates the protrusion along the thickness direction of the cover plate. And / or, the mating part is internally threaded, and the engaging part is externally threaded.

[0009] In one optional embodiment, the mating part includes a guide groove and a snap-fit ​​groove, the snap-fit ​​groove having a gap with the opening of the mounting hole, one end of the guide groove communicating with the snap-fit ​​groove, and the other end extending to the opening of the mounting hole, at least a portion of the snap-fit ​​groove being disposed on one side of the guide groove, and the engaging part being able to enter or exit the snap-fit ​​groove through the guide groove.

[0010] In one optional embodiment, the number of mating parts is at least two, and the at least two mating parts are distributed circumferentially along the mounting hole, with each engaging part corresponding to one of the mating parts; And / or, the limiting member is configured as a cylindrical structure, the outer peripheral wall of the cylindrical structure is provided with the engaging portion, and along the axial direction of the mounting hole, the size of the cylindrical structure is larger than the size of the engaging portion.

[0011] In one alternative embodiment, the seal includes an end and a column connected to each other, the cross-sectional area of ​​the end being larger than that of the column, the end being disposed in the mounting hole and abutting against the limiting member, and the column being inserted into the injection hole and sealing the injection hole.

[0012] In one alternative embodiment, the end head is interference-fitted with the mounting hole; And / or, the diameter of the end is 10mm~12mm, and the length of the end is 3mm~4mm; And / or, the column body is interference-fitted with the injection hole; And / or, the diameter of the column is 5mm to 6mm.

[0013] Secondly, the present invention also provides a battery, including a casing, a battery cell, and a top cover assembly as described above, wherein the battery cell is disposed inside the casing, and the top cover assembly is connected to the casing and closes the opening of the casing.

[0014] Thirdly, this utility model also provides a battery pack, including the battery as described above.

[0015] One of the above technical solutions has the following advantages or beneficial effects: In the top cover assembly, after the seal is compressed by the limiting member, it tightly fills the gap between the limiting member and the bottom of the mounting hole, while also conforming to the area around the injection hole to form a surface seal. The mating part can axially limit the engaging part, continuously maintaining the compressive force on the seal, preventing the seal from rebounding and deteriorating its sealing performance due to vibration and temperature changes during long-term use, and ensuring long-term sealing effectiveness throughout the battery's entire life cycle.

[0016] This solution replaces the laser welding sealing process by using detachable limiting components in conjunction with sealing components. It can fundamentally avoid defects such as heat-affected zone problems, uneven material melting, and pore formation during the welding process, and significantly improve the reliability and consistency of the sealing.

[0017] In addition, when the battery needs to be replenished with electrolyte, simply rotate the limiting component to release the limiting part from the locking part. Then, remove the limiting component and the seal to replenish the electrolyte through the filling hole. After replenishment, reinstall the limiting component and the seal to restore the seal, thus reducing battery maintenance costs.

[0018] The battery and battery pack provided by this utility model include all the advantages of the top cover assembly mentioned above, since they incorporate the top cover assembly provided by this utility model. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 A front view of a top cover assembly provided in an embodiment of this utility model; Figure 2 for Figure 1 The sectional view of AA shown; Figure 3 for Figure 2 A magnified view of part A in the diagram; Figure 4 This is a schematic diagram of the top cover assembly provided in an embodiment of the present utility model; Figure 5 An exploded view of the top cover assembly provided in an embodiment of this utility model; Figure 6 A schematic diagram of the structure of the cover plate provided in an embodiment of this utility model; Figure 7 This is a schematic diagram of the structure of the limiting member provided in an embodiment of the present utility model; Figure 8 This is a schematic diagram of the structure of the sealing element provided in an embodiment of the present utility model.

[0021] Explanation of reference numerals in the attached figures: 1. Cover plate; 101. Mounting hole; 102. Injection hole; 103. Mating part; 1031. Guide groove; 1032. Snap-fit ​​groove; 104. First surface; 105. Second surface; 106. Protrusion; 2. Limiting element; 201. Snap-fit ​​part; 202. Tightening part; 3. Sealing element; 301. End; 302. Column. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0023] Currently, the laser welding process for sealing aluminum nails is widely used due to its ease of operation and high efficiency. However, the laser welding effect is affected by the cleanliness of the injection port, laser parameters, and the shape of the aluminum nail, which can easily lead to problems such as cracks, bursts, or pinholes in the weld.

[0024] To address or improve the problem that laser welding results are affected by the cleanliness of the injection port and laser parameters, which can easily lead to cracks, bursts, or pinholes in the weld, this utility model provides a top cover assembly, a battery, and a battery pack.

[0025] The following is combined Figures 1 to 8 This describes the top cover assembly provided in the embodiments of the present invention.

[0026] Specifically, the top cover assembly includes a cover plate 1, a limiting member 2, and a sealing member 3.

[0027] The cover plate 1 can be, but is not limited to, an aluminum plate, a stainless steel plate, or a plastic plate. The cover plate 1 has a through stepped hole that extends along the thickness direction of the cover plate 1. The stepped hole includes a mounting hole 101 and an injection hole 102 with cross-sections decreasing in size; for example, the diameter of the mounting hole 101 is larger than the diameter of the injection hole 102. The injection hole 102 is used to inject electrolyte into the battery. A mating portion 103 is provided on the wall of the mounting hole 101.

[0028] The limiting member 2 is detachably disposed within the mounting hole 101, and a locking portion 201 is provided on the outer periphery of the limiting member 2. During the rotation of the limiting member 2, the mating portion 103 can axially limit or release the locking portion 201. For example, during the rotation of the limiting member 2 in a first direction, the mating portion 103 can axially limit the locking portion 201, and during the rotation of the limiting member 2 in a second direction, the mating portion 103 releases the axial limit on the locking portion 201, wherein the first direction and the second direction are opposite.

[0029] The end face of the limiting member 2 facing away from the injection hole 102 is provided with a recessed screwing part 202, which is used to engage with a screwing tool, such as a wrench.

[0030] At least a portion of the seal 3 is disposed within the mounting hole 101, and with the mating portion 103 axially limiting the engaging portion 201, the limiting member 2 presses against the seal 3 to seal the gap between the limiting member 2 and the bottom of the mounting hole 101. For example, the seal 3 may be a rubber component.

[0031] In this embodiment, after the sealing member 3 is squeezed by the limiting member 2, it will tightly fill the gap between the limiting member 2 and the bottom of the mounting hole 101, and at the same time fit the surrounding area of ​​the injection hole 102, forming a surface seal. The mating part 103 can axially limit the engaging part 201, continuously maintain the compressive force on the sealing member 3, and avoid the sealing member 3 from rebounding and the sealing performance decreasing due to vibration and temperature changes during long-term use.

[0032] This solution replaces the laser welding sealing process by using a detachable limiting component 2 in conjunction with a sealing component 3. This can fundamentally avoid defects such as heat-affected zone problems, uneven material melting, and pore formation during the welding process, and significantly improve the reliability and consistency of the sealing.

[0033] In addition, when the battery needs to be replenished with electrolyte, simply rotate the limiting member 2 to release the limiting part 103 from the locking part 201. Then, remove the limiting member 2 and the sealing member 3 to replenish the electrolyte through the filling hole 102. After replenishment, reinstall the limiting member 2 and the sealing member 3 to restore the seal, thus reducing battery maintenance costs.

[0034] Furthermore, during the tightening of the limiting component 2, the tightening part 202 can precisely engage with tools such as wrenches, facilitating quick loosening or tightening of the limiting component 2 without destructive operation, thus reducing assembly and after-sales maintenance difficulty. Additionally, the tightening part 202 prevents slippage between the tool and the limiting component 2, ensuring stable torque transmission in both automated assembly and manual operation, guaranteeing precise locking of the limiting component 2, and meeting the high-efficiency assembly requirements of mass production of power batteries.

[0035] Meanwhile, since the screw-on part 202 is recessed inside the end face of the limiting member 2, its structure is surrounded and shielded by the surrounding material, which can effectively prevent structural damage or deformation of the screw-on part caused by collision or scratching of external foreign objects during battery production, transportation, assembly, or use. Furthermore, the recessed screw-on part 202 ensures that the surface of the limiting member 2 does not protrude from the plane of the top cover assembly, thereby avoiding spatial interference caused by protruding structures.

[0036] Optionally, the screwing part 202 includes a polygonal hole, such as a triangular hole, a quadrilateral hole, or a hexagonal hole, which is coaxially arranged with the limiting member 2.

[0037] In this embodiment, the polygonal hole can have surface contact or multi-point engagement with the corresponding polygonal wrench to avoid slippage, wear, or "stripping" during tightening or loosening. The tightening part 202 is coaxially arranged with the limiting member 2. When torque is applied, the torque is evenly distributed along the central axis to avoid generating eccentric force or lateral shear force, thereby reducing damage to the limiting member 2.

[0038] Of course, the screwing part 202 may also include at least two snap-fit ​​holes, which are distributed circumferentially along the limiting member 2. The snap-fit ​​holes may be pin holes or positioning grooves.

[0039] In this embodiment, torque transmission is achieved by inserting a pin or a locating pin of a special wrench. This means that the tightening part 202 must be operated with a special tool containing the corresponding pin, preventing non-professionals from using general tools and further reducing the risk of accidental damage to the battery seal. Simultaneously, the multiple snap-fit ​​holes distributed circumferentially disperse the torque to multiple contact points, avoiding localized wear.

[0040] In some embodiments provided by this utility model, a positive terminal and a negative terminal are provided on the surface of the cover plate 1, and the mounting hole 101 and the liquid injection hole 102 are both provided between the positive terminal and the negative terminal. The positive terminal is used to connect to the positive electrode tab of the battery cell, and the negative terminal is used to connect to the negative electrode tab of the battery cell.

[0041] This design fully utilizes the central area between the two terminals, achieving a high degree of functional integration of the top cover assembly and a more compact structure. Simultaneously, the area between the two terminals is a low-heat zone of the battery. Placing the mounting hole 101 and the electrolyte filling hole 102 between the two terminals keeps the seal 3 away from the heat-generating area of ​​the terminals, reducing the aging effect of terminal heating on the seal 3, extending the lifespan of the seal 3, and improving the long-term reliability of the seal.

[0042] In some embodiments provided by this utility model, the cover plate 1 is a rectangular plate with a length of 100mm to 150mm, for example, the length of the cover plate 1 is 100mm, 110mm, 120mm, 130mm, 140mm, or 150mm. The width of the cover plate 1 is 35mm to 50mm, for example, the width of the cover plate 1 is 35mm, 40mm, 45mm, or 50mm. This configuration allows the cover plate 1 to be suitable for prismatic batteries.

[0043] In some embodiments provided by this utility model, the thickness of the cover plate 1 is 2mm to 3mm, for example, the thickness of the cover plate 1 is 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm or 3mm.

[0044] In some embodiments provided by this utility model, the depth of the mounting hole 101 is 5mm to 7mm, for example, the depth of the mounting hole 101 is 5mm, 5.5mm, 6mm, 6.5mm or 7mm. The diameter of the mounting hole 101 is 9mm to 11mm, for example, the diameter of the mounting hole 101 is 9mm, 9.5mm, 10mm, 10.5mm or 11mm.

[0045] In some embodiments of this utility model, the depth of the injection hole 102 is 2mm to 3mm, for example, the depth of the injection hole 102 is 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, or 3mm. The diameter of the injection hole 102 is 4mm to 5mm, for example, the diameter of the injection hole 102 is 4mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, or 5mm.

[0046] In some embodiments provided by this utility model, the mating part 103 includes a guide groove 1031 and a snap-fit ​​groove 1032.

[0047] The snap-fit ​​groove 1032 is spaced from the opening of the mounting hole 101. Specifically, the snap-fit ​​groove 1032 is located on the wall of the mounting hole 101 and is spaced from the opening of the mounting hole 101. One end of the guide groove 1031 communicates with the snap-fit ​​groove 1032, and the other end extends to the opening of the mounting hole 101.

[0048] At least a portion of the snap-fit ​​groove 1032 is provided on one side of the guide groove 1031. For example, one end of the snap-fit ​​groove 1032 communicates with the guide groove 1031, and the other end extends circumferentially along the mounting hole 101. The engaging portion 201 can enter or disengage from the snap-fit ​​groove 1032 via the guide groove 1031. For example, the engaging portion 201 can be a boss, protrusion, or raised part provided on the outer peripheral surface of the limiting member 2.

[0049] It is understandable that when the engaging part 201 is inserted into the engaging groove 1032, the distance between the limiting member 2 and the bottom of the mounting hole 101 is less than the height of the seal 3 protruding from the bottom of the mounting hole 101, so that the limiting member 2 can squeeze the seal 3 to deform and form an effective seal.

[0050] In this embodiment, when the limiting member 2 is installed in the mounting hole 101, the engaging part 201 is aligned with the guide groove 1031, and then the limiting member 2 is pressed into the mounting hole 101 until the engaging part 201 moves to be opposite to the engaging groove 1032. Then the limiting member 2 is rotated to make the engaging part 201 enter the engaging groove 1032, so that the engaging groove 1032 axially limits the engaging part 201.

[0051] When removing the limiting member 2 from the mounting hole 101, first rotate the limiting member 2 to disengage the engaging part 201 from the engaging groove 1032, so that the engaging groove 1032 releases the axial restriction on the engaging part 201, and then pull the limiting member 2 out of the mounting hole 101.

[0052] With this configuration, there is a gap between the locking groove 1032 and the opening of the mounting hole 101. After the engaging part 201 enters the locking groove 1032, the side wall of the locking groove 1032 near the opening will form a rigid block against the engaging part 201, which can continuously withstand the axial force generated by the rebound of the sealing element 3 due to the limiting member 2. This rigid limiting has a stronger load-bearing capacity and can maintain the compressive force on the sealing element 3 for a long time. It will not reduce the limiting force due to material fatigue and can prevent the sealing element 3 from rebounding.

[0053] Optionally, with the engaging part 201 inserted into the engaging groove 1032, the limiting member 2 does not protrude from the opening of the mounting hole 101.

[0054] In this embodiment, after the limiting member 2 is installed and rotated to allow the engaging part 201 to enter the engaging groove 1032, its outer end face is flush with or located inside the surface of the top cover assembly, thus avoiding the limiting member 2 from protruding and conflicting with adjacent components, and there is no need to reserve a clearance for the limiting member 2.

[0055] In some embodiments provided by this utility model, the number of mating parts 103 is at least two, and the at least two mating parts 103 are distributed circumferentially along the mounting hole 101, with the engaging part 201 corresponding one-to-one with the mating part 103. For example, the figure shows an example with three mating parts 103. It can be understood that the number of mating parts 103 can also be two or more. Optionally, at least two mating parts 103 are evenly distributed circumferentially along the mounting hole 101.

[0056] In this embodiment, multiple sets of mating parts 103 are distributed circumferentially, ensuring that the circumferential force is consistent when the limiting member 2 is locked. This prevents the limiting member 2 from tilting due to unilateral force, ensuring uniform compression of the sealing member 3 and improving sealing reliability. In addition, the load is shared by multiple mating parts 103, reducing single-point stress and improving structural durability.

[0057] In some embodiments of this utility model, the limiting member 2 is a cylindrical structure, and the outer peripheral wall of the cylindrical structure is provided with a locking portion 201. Along the axial direction of the mounting hole 101, the size of the cylindrical structure is larger than the size of the locking portion 201. Optionally, there is a gap between the locking portion 201 and the two end faces of the cylindrical structure.

[0058] In this embodiment, the axial dimension of the limiting member 2 is larger, which means that its main body (non-engaging area) can form a longer mating section with the wall of the mounting hole 101. This provides stable guidance in the circumferential direction, preventing the limiting member from tilting or wobbling when rotated or subjected to vibration. Especially when used with multiple sets of circumferentially distributed engaging parts, the longer main body can further ensure that the limiting member 2 is subjected to balanced force, preventing uneven compression of the seal due to local deflection.

[0059] In some embodiments provided by this utility model, the sealing member 3 includes an end 301 and a column 302 connected to each other, for example, the end 301 and the main body are configured as an integrally formed structure.

[0060] The cross-sectional area of ​​end 301 is larger than that of column 302; specifically, the diameter of end 301 is larger than the diameter of the main body. End 301 is located in mounting hole 101 and abuts against limiting member 2. Column 302 passes through injection hole 102 and seals injection hole 102.

[0061] In this embodiment, the column 302 is inserted into the injection hole 102 to achieve radial sealing, and the end 301 abuts against the limiting member 2 to achieve axial sealing, forming a double seal. The double seal can effectively prevent electrolyte leakage.

[0062] In addition, the column 302 embedded in the injection hole 102 can accurately position the seal 3, avoiding vibration that could cause the seal 3 to shift. The larger cross-sectional area of ​​the end 301 improves the contact stability with the bottom of the hole and the limiting member 2, reducing the risk of seal failure.

[0063] In some embodiments of this utility model, the end 301 and the mounting hole 101 are interference-fitted, for example, the interference amount is greater than or equal to 0.5mm. In this embodiment, the interference fit between the end 301 and the mounting hole 101 ensures that the end 301 and the wall of the mounting hole 101 are tightly fitted, forming a sealing barrier. This, combined with the sealing effect of the limiting member 2, further reduces the risk of electrolyte leakage and is suitable for complex driving conditions.

[0064] In some embodiments provided by this utility model, the diameter of the end 301 is 10mm to 12mm, for example, the diameter of the end 301 is 10mm, 10.5mm, 11mm, 11.5mm or 12mm. The length of the end 301 is 3mm to 4mm, for example, the length of the end 301 is 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm or 4mm.

[0065] In some embodiments of this invention, the column 302 and the injection hole 102 are interference-fitted, for example, the interference amount is greater than or equal to 0.5 mm. In this embodiment, the interference fit between the column 302 and the injection hole 102 ensures that the column 302 tightly fills the gap of the injection hole 102, which can block the electrolyte leakage channel from the source. Combined with the surface seal of the end 301, it forms double protection inside and at the bottom of the hole, thereby better meeting the stringent sealing requirements.

[0066] In some embodiments provided by this utility model, the diameter of the column 302 is 5mm to 6mm, for example, the diameter of the column 302 is 5mm, 5.1mm, 5.2mm, 5.3mm, 5.4mm, 5.5mm, 5.6mm, 5.7mm, 5.8mm, 5.9mm or 6mm.

[0067] In some embodiments provided by this utility model, the cover plate 1 has a first surface 104 and a second surface 105 facing away from each other.

[0068] The first surface 104 has a protrusion 106 that protrudes along the thickness direction of the cover plate 1. A mounting hole 101 is located on the second surface 105 opposite to the protrusion 106 and is recessed into the protrusion 106. An injection hole 102 penetrates the protrusion 106 along the thickness direction of the cover plate 1. It is understood that when the top cover assembly is installed on the battery casing, the first surface 104 faces the casing, and the second surface 105 faces away from the casing.

[0069] In this embodiment, the protrusion 106 protrudes from the first surface 104 and does not occupy the space of the second surface 105 of the top cover assembly. This ensures the structural depth of the injection hole 102 and the mounting hole 101 without affecting the external integration of the battery pack, thus meeting the compact layout requirements of the power battery. The mounting hole 101 is recessed into the protrusion 106, providing sufficient installation space for the seal 3 and the limiting member 2, thereby improving the sealing reliability.

[0070] Optionally, the protrusion 106 and the cover plate 1 can be configured as an integral structure by casting, stamping, forging, or welding. In this embodiment, the integral molding of the protrusion 106 and the cover plate 1 can avoid connection gaps, improve overall mechanical strength and sealing reliability.

[0071] It is understood that the mating part 103 is not limited to including the guide groove 1031 and the snap-fit ​​groove 1032. For example, in other embodiments provided by this utility model, the mating part 103 is an internal thread and the snap-fit ​​part 201 is an external thread.

[0072] In this embodiment, the mating part 103 can be screwed into the engaging part 201 by twisting, thereby limiting the engaging part 201, or the mating part 103 can be disengaged from the engaging part 201 by twisting in the opposite direction, thereby releasing the limiting of the engaging part.

[0073] This design allows the threaded engagement to generate continuous axial pressure through a helical structure, resisting vibrations and impacts from vehicle bumps and rapid acceleration, preventing the limiting component 2 from loosening, ensuring long-term stable compression of the seal 3, and reducing the risk of leakage. Furthermore, the compressive force of the limiting component 2 on the seal 3 can be precisely controlled by the tightening depth, adapting to the compression requirements of seals 3 made of different materials, ensuring sealing performance while preventing excessive deformation and damage to the seal 3.

[0074] Of course, the features in the above embodiments can also be combined with each other to obtain an overall solution. For example, in some embodiments provided by this utility model, the top cover assembly includes a cover plate 1, a limiting plate and a sealing element 3.

[0075] The cover plate 1 can be, but is not limited to, an aluminum plate, a stainless steel plate, or a plastic plate. The cover plate 1 has a mounting hole 101 and a liquid injection hole 102. The opening of the mounting hole 101 faces one side of the cover plate 1. Specifically, the mounting hole 101 is a blind hole; when the cover plate 1 is closed over the battery casing, the opening of the mounting hole 101 faces the outside of the cover plate 1, i.e., the side of the cover plate 1 away from the casing. The liquid injection hole 102 is located at the bottom of the mounting hole 101 and penetrates through the cover plate 1, i.e., the liquid injection hole 102 and the mounting hole 101 form a stepped hole. The liquid injection hole 102 is used to inject liquid into the battery. The wall of the mounting hole 101 is provided with a mating part 103.

[0076] Specifically, the cover plate 1 has a first surface 104 and a second surface 105 facing away from each other. The first surface 104 has a protrusion 106 that protrudes along the thickness direction of the cover plate 1. The mounting hole 101 is located on the second surface 105 opposite to the protrusion 106 and is recessed into the protrusion 106. The injection hole 102 penetrates the protrusion 106 along the thickness direction of the cover plate 1.

[0077] The limiting member 2 is detachably provided in the mounting hole 101, and a locking portion 201 is provided on the outer periphery of the limiting member 2. During the rotation of the limiting member 2, the mating portion 103 can axially limit or release the locking portion 201. For example, during the rotation of the limiting member 2 in the first direction, the mating portion 103 can axially limit the locking portion 201, and during the rotation of the limiting member 2 in the second direction, the mating portion 103 can release the axial limitation on the locking portion 201. The limiting member 2 is provided with a tightening portion 202 for engaging with a tightening tool, and the tightening portion 202 is provided on the surface of the limiting member 2 opposite to the sealing member 3.

[0078] At least a portion of the seal 3 is disposed at the bottom of the mounting hole 101, and in the state where the mating part 103 axially limits the engaging part 201, the limiting member 2 presses the seal 3 so that the seal 3 seals the gap between the limiting member 2 and the bottom of the mounting hole 101. For example, the seal 3 may be a rubber part.

[0079] Specifically, the sealing element 3 includes an end 301 and a column 302 connected to each other. For example, the end 301 and the main body are integrally formed. The cross-sectional area of ​​the end 301 is larger than that of the column 302; specifically, the diameter of the end 301 is larger than the diameter of the main body. The end 301 is located at the bottom of the mounting hole 101 and abuts against the limiting member 2. The column 302 passes through the injection hole 102 and seals the injection hole 102. The end 301 and the mounting hole 101 are interference-fitted. The column 302 and the injection hole 102 are interference-fitted.

[0080] Optionally, the mating part 103 includes a guide groove 1031 and a snap-fit ​​groove 1032. The snap-fit ​​groove 1032 is spaced from the opening of the mounting hole 101. That is, the snap-fit ​​groove 1032 is located on the wall of the mounting hole 101 and is spaced from the opening of the mounting hole 101. One end of the guide groove 1031 communicates with the snap-fit ​​groove 1032, and the other end extends to the opening of the mounting hole 101.

[0081] At least a portion of the snap-fit ​​groove 1032 is provided on one side of the guide groove 1031. For example, one end of the snap-fit ​​groove 1032 communicates with the guide groove 1031, and the other end extends circumferentially along the mounting hole 101. The engaging portion 201 can enter or disengage from the snap-fit ​​groove 1032 via the guide groove 1031. For example, the engaging portion 201 can be a boss, protrusion, or protrusion provided on the outer peripheral surface of the limiting member 2. When the engaging portion 201 is inserted into the snap-fit ​​groove 1032, the limiting member 2 does not protrude from the opening of the mounting hole 101. The number of mating portions 103 is at least two, and the at least two mating portions 103 are distributed circumferentially along the mounting hole 101, with each engaging portion 201 corresponding to one mating portion 103.

[0082] Alternatively, the mating part 103 may have an internal thread, and the engaging part 201 may have an external thread.

[0083] This utility model also provides a battery.

[0084] Specifically, the battery includes a casing, battery cells, and a top cover assembly as described above. The battery cells are housed inside the casing, and the top cover assembly is connected to the casing and closes the opening of the casing.

[0085] It should be noted that the battery includes the top cover assembly, and therefore also includes all the advantages of the top cover assembly mentioned above, so it will not be elaborated further.

[0086] A battery pack is also provided in this embodiment of the invention.

[0087] Specifically, the battery pack includes the batteries described above.

[0088] It should be noted that the battery pack includes the battery, and therefore includes all the advantages of the battery mentioned above, so this will not be elaborated further.

[0089] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A top cover assembly, characterized in that, include: The cover plate (1) is provided with a through stepped hole, the stepped hole including a mounting hole (101) and an injection hole (102) with the cross-section decreasing from large to small, and the wall of the mounting hole (101) is provided with a mating part (103). The limiting member (2) is detachably installed in the mounting hole (101). The outer periphery of the limiting member (2) is provided with a locking part (201). During the rotation of the limiting member (2), the mating part (103) can axially limit or release the locking part (201). The end face of the limiting member (2) away from the injection hole (102) is provided with a recessed screwing part (202). The sealing element (3) is at least partially disposed in the mounting hole (101), and the limiting element (2) presses the sealing element (3) while the mating part (103) axially limits the engaging part (201).

2. The top cover assembly according to claim 1, characterized in that, The screwing part (202) includes a polygonal hole, which is coaxially arranged with the limiting member (2); Alternatively, the screwing part (202) may include at least two snap-fit ​​holes, which are distributed circumferentially along the limiting member (2).

3. The top cover assembly according to claim 1, characterized in that, The cover plate (1) is a rectangular plate with a length of 100mm~150mm and a width of 35mm~50mm. And / or, the thickness of the cover plate (1) is 2mm~3mm; And / or, the depth of the mounting hole (101) is 5mm~7mm, and the diameter of the mounting hole (101) is 9mm~11mm; And / or, the depth of the injection hole (102) is 2mm~3mm, and the diameter of the injection hole (102) is 4mm~5mm; And / or, the surface of the cover plate (1) is provided with a positive electrode post and a negative electrode post, and the mounting hole (101) and the liquid injection hole (102) are located between the positive electrode post and the negative electrode post.

4. The top cover assembly according to claim 1, characterized in that, The cover plate (1) has a first surface (104) and a second surface (105) facing away from each other. The first surface (104) is provided with a protrusion (106) that protrudes along the thickness direction of the cover plate (1). The mounting hole (101) is located on the second surface (105) opposite to the protrusion (106) and is recessed into the protrusion (106). The injection hole (102) penetrates the protrusion (106) along the thickness direction of the cover plate (1). And / or, the mating part (103) is internally threaded, and the engaging part (201) is externally threaded.

5. The top cover assembly according to claim 1, characterized in that, The mating part (103) includes a guide groove (1031) and a snap-fit ​​groove (1032). There is a gap between the snap-fit ​​groove (1032) and the opening of the mounting hole (101). One end of the guide groove (1031) communicates with the snap-fit ​​groove (1032), and the other end extends to the opening of the mounting hole (101). At least a portion of the snap-fit ​​groove (1032) is provided on one side of the guide groove (1031). The engaging part (201) can enter or disengage from the snap-fit ​​groove (1032) through the guide groove (1031).

6. The top cover assembly according to claim 5, characterized in that, The number of mating parts (103) is at least two, and the at least two mating parts (103) are distributed circumferentially along the mounting hole (101), and the engaging part (201) corresponds one-to-one with the mating part (103); And / or, the limiting member (2) is provided as a cylindrical structure, the outer peripheral wall of the cylindrical structure is provided with the engaging part (201), and along the axial direction of the mounting hole (101), the size of the cylindrical structure is larger than the size of the engaging part (201).

7. The top cover assembly according to claim 1, characterized in that, The sealing element (3) includes an end (301) and a column (302) connected to each other. The cross-sectional area of ​​the end (301) is larger than the cross-sectional area of ​​the column (302). The end (301) is located in the mounting hole (101) and abuts against the limiting element (2). The column (302) passes through the injection hole (102) and blocks the injection hole (102).

8. The top cover assembly according to claim 7, characterized in that, The end (301) is interference-fitted with the mounting hole (101); And / or, the diameter of the end (301) is 10mm~12mm, and the length of the end (301) is 3mm~4mm; And / or, the column (302) is interference-fitted with the injection hole (102); And / or, the diameter of the column (302) is 5mm to 6mm.

9. A battery, characterized in that, It includes a housing, a battery cell, and a top cover assembly as described in any one of claims 1-8, wherein the battery cell is disposed within the housing, and the top cover assembly is connected to the housing and closes an opening in the housing.

10. A battery pack, characterized in that, Includes the battery as described in claim 9.

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