Composite battery pole simple top cover structure

Abstract

The utility model discloses a kind of composite battery pole simple top cover structure, including the reinforcing composite layer of rectangular structure, reinforcing composite layer middle position is equipped with explosion-proof valve, and pole post assembly is respectively installed in the both ends of reinforcing composite layer, reinforcing composite layer overall buckle is installed on lower plastic support, the thickness of reinforcing composite layer is 0.6-3.5mm.In the application, reinforcing plate layer and aluminum plate layer are combined to form composite design, the tensile strength and bending strength of reinforcing plate layer are greater than the strength of aluminum plate layer, and the reinforcing composite layer with composite design not only ensures the anti-deformation strength of top cover sheet, but also reduces the thickness of top cover sheet, increases the shell space and improves the energy density of battery.

Description

Technical Field

[0001] This utility model relates to the field of battery top cover structure technology, specifically to a composite battery minimalist top cover structure. Background Technology

[0002] Currently, the mainstream packaging forms of lithium-ion batteries are cylindrical, prismatic, and pouch cells. Among prismatic cells, aluminum and steel are the main types, with prismatic aluminum-cased batteries having a higher penetration rate in China. Continuously improving the safety and energy density of lithium batteries is essential to meeting demand. As a crucial component of lithium-ion batteries, the top cover of prismatic aluminum-cased lithium batteries faces higher requirements in terms of safety design, weight, and space utilization.

[0003] Currently, lithium-ion batteries are mainly packaged in three forms: cylindrical, prismatic, and pouch. Among them, prismatic aluminum-cased batteries are more widely used in China due to their lightweight and cost advantages. However, as the size of the battery casing increases, the internal gas pressure rises, requiring traditional stainless steel top covers to be thickened (1.5-4.0mm) to resist deformation, resulting in reduced internal space and difficulty in improving energy density. Although aluminum alloy top covers can reduce weight, their strength is insufficient, necessitating a composite design to resolve the contradiction between strength and thickness.

[0004] Therefore, a composite battery minimalist top cover structure is needed that can ensure the deformation resistance of the top cover sheet while reducing the thickness of the top cover sheet to increase the casing space and help improve the energy density of the battery. Utility Model Content

[0005] The purpose of this invention is to provide a composite battery minimalist top cover structure to solve the problem of poor performance of top cover sheet structures.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] A minimalist composite battery top cover structure includes a rectangular reinforced composite layer, an explosion-proof valve installed in the middle of the reinforced composite layer, and terminal post assemblies installed at both ends of the reinforced composite layer. The reinforced composite layer is snapped onto a lower plastic bracket. The thickness of the reinforced composite layer is 0.6-3.5 mm.

[0008] As a further embodiment of this utility model: the reinforcing composite layer includes a reinforcing plate layer and an aluminum plate layer, wherein the reinforcing plate layer is disposed above or below the aluminum plate layer; wherein the material of the reinforcing plate layer includes, but is not limited to, stainless steel, nickel, titanium or copper, and its strength is greater than that of the aluminum plate layer.

[0009] As a further embodiment of this utility model: when the reinforcing plate layer is disposed above the aluminum plate layer, the outline edge of the aluminum plate layer is turned upward to form a covering groove, and the reinforcing plate layer is fitted and installed in the covering groove.

[0010] As a further embodiment of this utility model: an explosion-proof valve clearance hole is provided at the middle position of the reinforcing plate layer and the aluminum plate layer, the top surface of the reinforcing plate layer is provided with a protrusion part 1 that protrudes along the outline of the explosion-proof valve clearance hole, and the bottom surface of the aluminum plate layer is provided with a welding stepped groove 2 that is recessed along the outline of the explosion-proof valve clearance hole. The welding stepped groove 2 is used to weld and connect with the top surface of the explosion-proof valve made of aluminum material.

[0011] As a further embodiment of this utility model: both ends of the reinforcing plate layer and the aluminum plate layer are provided with pole post clearance holes that are vertically connected. A pole post assembly is provided above the pole post clearance holes. The pole post assembly includes a plastic sleeve, a pole post body, a welding ring, and a sealing ring. The sealing ring is set along the contour of the pole post clearance holes, and the bottom end face of the sealing ring abuts against the sealing groove formed by the top end face of the aluminum plate layer, and the top end face abuts against the pole post body. The pole post body is located inside the welding ring, and a plastic sleeve is fitted on the outer periphery of the welding ring.

[0012] The welding ring is made of the same material as the reinforcing plate, and the bottom end of the welding ring is welded into a welding stepped groove formed by the indentation of the top end of the reinforcing plate.

[0013] As a further embodiment of this utility model: multiple undercut grooves are provided at the four edges of the aluminum plate layer, and the undercut grooves are adapted to and snapped together with the undercut posts on the lower plastic bracket.

[0014] As a further embodiment of this utility model: when the reinforcing plate layer is disposed below the aluminum plate layer, the reinforcing plate layer is attached to and installed on the bottom surface of the aluminum plate layer.

[0015] As a further embodiment of this utility model: an explosion-proof valve clearance hole is provided at the middle position of the reinforcing plate layer and the aluminum plate layer, the top surface of the aluminum plate layer is provided with a protrusion forming a protrusion along the outline of the explosion-proof valve clearance hole, and the bottom surface of the reinforcing plate layer is provided with a welding stepped groove forming a recess along the outline of the explosion-proof valve clearance hole. The explosion-proof valve is made of the same material as the reinforcing plate layer, and the welding stepped groove is used to weld and connect with the top surface of the explosion-proof valve.

[0016] As a further embodiment of this utility model: an explosion-proof valve clearance hole is provided at the middle position of the reinforcing plate layer and the aluminum plate layer, and a second welding stepped groove is provided on the top surface of the aluminum plate layer, which is recessed along the outline of the explosion-proof valve clearance hole. A first protrusion is provided on the bottom surface of the reinforcing plate layer, which is raised along the outline of the explosion-proof valve clearance hole. The second welding stepped groove is used to weld and connect with the bottom surface of the explosion-proof valve made of aluminum material.

[0017] As a further embodiment of this utility model: both ends of the reinforcing plate layer and the aluminum plate layer are provided with pole column clearance holes that are vertically connected. A pole column assembly is provided above the pole column clearance holes. The pole column assembly includes a plastic sleeve, a pole column body, a welding ring, and a sealing ring. The sealing ring is set along the contour of the pole column clearance holes, and the bottom end face of the sealing ring abuts against the sealing groove formed by the top end face of the reinforcing plate layer. The top end face abuts against the pole column body. The pole column body is located inside the welding ring, and a plastic sleeve is fitted on the outer periphery of the welding ring.

[0018] The welding ring is made of aluminum, and the bottom end of the aluminum ring is welded into a welding stepped groove formed by the indentation of the top end of the aluminum plate layer.

[0019] The beneficial effects of this utility model are:

[0020] (1) In this application, a composite design is formed by combining a reinforcing plate layer and an aluminum plate layer. The tensile strength and bending strength of the reinforcing plate layer are greater than those of the aluminum plate layer. The reinforced composite layer with the composite design not only ensures the deformation resistance of the top cover sheet, but also reduces the thickness of the top cover sheet, increases the shell space, and improves the energy density of the battery.

[0021] (2) The reinforcing plate layer and aluminum plate layer between the composite layers in this application are reinforced by a flanged wrapping design and are snapped onto the lower plastic bracket to enhance the interlayer bonding force and avoid the risk of delamination.

[0022] (3) This application can be modularly designed, and the reinforcement plate, aluminum plate, explosion-proof valve, pole assembly and lower plastic bracket are easy to assemble in a modular manner, which helps to improve production efficiency. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings.

[0024] Figure 1 This is a schematic diagram of the structure of this utility model;

[0025] Figure 2 This is a breakdown diagram of the present invention;

[0026] Figure 3 This is a schematic diagram of the pole assembly structure of this utility model;

[0027] Figure 4 This is a schematic diagram of the disassembled pole assembly of this utility model;

[0028] Figure 5 This is a bottom view of the lower surface of the reinforced composite layer of this utility model.

[0029] In the diagram: 100, Reinforced composite layer; 101, Explosion-proof valve clearance hole; 102, Pole post clearance hole; 103, Sealing groove; 104, Welded stepped groove one; 105, Protrusion one; 106, Protrusion two; 107, Welded stepped groove two; 108, Inverted groove; 200, Lower plastic bracket; 201, Inverted post; 202, Explosion-proof valve recess; 300, Pole post assembly; 301, Plastic sleeve; 302, Pole post body; 303, Welded ring; 304, Sealing ring; 400, Explosion-proof valve. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0031] In the description of this utility model, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to 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 utility model; in the description of this utility model, "a plurality of" or "several" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0032] Example 1

[0033] Please see Figures 1 to 5 As shown, this utility model is a minimalist composite battery top cover structure, including a rectangular reinforced composite layer 100. The reinforced composite layer 100 includes a reinforcing plate layer and an aluminum plate layer. The reinforcing plate layer is disposed on top of the aluminum plate layer. The material of the reinforcing plate layer includes, but is not limited to, stainless steel, nickel, titanium, or copper. It should be understood that the material of the reinforcing plate layer can be other metal materials, whose strength is greater than that of aluminum. In this application, a composite design is formed by combining the reinforcing plate layer and the aluminum plate layer. The tensile strength and bending strength of the reinforcing plate layer are greater than those of the aluminum plate layer. The thickness of the reinforced composite layer 100 with the composite design is between 0.6-3.5mm, which ensures the deformation resistance of the top cover sheet while reducing the thickness of the top cover sheet, increasing the shell space, and improving the energy density of the battery.

[0034] In the process of combining the reinforcing plate and the aluminum plate to form a composite design, the outline edge of the aluminum plate is turned up to form a covering groove, and the reinforcing plate is installed in the covering groove to facilitate the overall composite installation of the reinforcing plate and the aluminum plate.

[0035] When an explosion-proof valve 400 is installed at the middle position of the reinforced composite layer 100, an explosion-proof valve clearance hole 101 that runs vertically through the middle position of the reinforcing plate and the aluminum plate is provided. A protrusion 105 is provided on the top surface of the reinforcing plate along the outline of the explosion-proof valve clearance hole 101. A welding stepped groove 107 is provided on the bottom surface of the aluminum plate along the inward outline of the explosion-proof valve clearance hole 101. The welding stepped groove 107 is used to weld and form a connection with the top surface of the aluminum explosion-proof valve 400. The protrusion 105 that protrudes along the outline of the explosion-proof valve clearance hole 101 is used to strengthen the connection strength of the explosion-proof valve 400 welded to the top cover plate. The explosion-proof valve 400 is a valve body made of aluminum material, so that it can be welded and fixed in the welding stepped groove 107 on the aluminum plate with the same material, so that the aluminum explosion-proof valve 400 is sealed and welded and fixed firmly. In another modified embodiment, the explosion-proof valve can be integrally stamped and formed with the aluminum plate.

[0036] When pole post assemblies 300 are installed at both ends of the reinforced composite layer 100, pole post clearance holes 102 are provided at both ends of the reinforcing plate layer and the aluminum plate layer, and pole post assemblies 300 are provided above the pole post clearance holes 102. The pole post assembly 300 includes a plastic sleeve 301, a pole post 302, a welding ring 303, and a sealing ring 304. The sealing ring 304 is set along the contour of the pole post clearance hole 102, and the bottom end face of the sealing ring 304 abuts against the sealing groove 103 formed by the top end face of the aluminum plate layer, and the top end face abuts against the pole post 302. The pole post 302 is located inside the welding ring 303, and the plastic sleeve 301 is sleeved on the outer periphery of the welding ring 303. The welding ring 303 is made of the same material as the reinforcing plate, and the bottom end face of the welding ring 303 is welded to the top end face of the reinforcing plate layer. The electrode assembly 300 needs to be sealed and welded within the recessed welded stepped groove 104. The electrode assembly 300 is pre-assembled using a plastic sleeve 301, an electrode body 302, a welding ring 303, and a sealing ring 304. This allows the sealing ring 304 to be sealed and positioned along the contour of the electrode clearance hole 102. The steel welding ring 303 is welded and fixed to the welded stepped groove 104 on the reinforcing plate layer to ensure a secure and sealed weld. In addition, when welding the electrode assembly 300, a second protrusion 106 is provided on the bottom surface of the aluminum plate layer, protruding along the contour of the electrode clearance hole 102. The second protrusion 106 is used to strengthen the connection strength of the top cover plate welded electrode assembly 300.

[0037] After the explosion-proof valve 400 and the pole assembly 300 are installed on the reinforced composite layer 100, the reinforced composite layer 100 is snapped onto the lower plastic bracket 200. Multiple undercut grooves 108 are provided at the four edges of the aluminum plate layer, and these grooves 108 are matched and snapped onto the undercut posts 201 on the lower plastic bracket 200. This application uses a stamping method to snap the reinforced composite layer 100 onto the lower plastic bracket 200. The undercut grooves 108 and undercut posts 201 are matched and snapped together to facilitate quick positioning of the reinforced composite layer 100 and the lower plastic bracket 200, and the snap-fit ​​connection is reliable. Finally, ultrasonic welding can be used to seal the contact surfaces between the reinforced composite layer 100 and the lower plastic bracket 200. When the lower plastic bracket 200 is assembled, it has an explosion-proof valve recess 202 for matching and positioning, and may also have a groove for positioning the protrusion 106.

[0038] Example 2

[0039] Please see Figures 1 to 5 As shown, this utility model is a minimalist composite battery top cover structure, including a rectangular reinforced composite layer 100. The reinforced composite layer 100 includes a reinforcing plate layer and an aluminum plate layer. The reinforcing plate layer is disposed below the aluminum plate layer. The material of the reinforcing plate layer includes, but is not limited to, stainless steel, nickel, titanium, or copper. It should be understood that the material of the reinforcing plate layer can be other metal materials, whose strength is greater than that of aluminum. In this application, a composite design is formed by combining the reinforcing plate layer and the aluminum plate layer. The tensile strength and bending strength of the reinforcing plate layer are greater than those of the aluminum plate layer. The thickness of the reinforced composite layer 100 with the composite design is between 0.6-3.5mm, which ensures the deformation resistance of the top cover sheet while reducing the thickness of the top cover sheet, increasing the shell space, and improving the energy density of the battery.

[0040] In the process of combining the reinforcing plate layer and the aluminum plate layer to form a composite design, the reinforcing plate layer is attached to the bottom surface of the aluminum plate layer to facilitate the overall composite installation of the reinforcing plate layer and the aluminum plate layer.

[0041] When an explosion-proof valve 400 is installed at the middle position of the reinforced composite layer 100, an explosion-proof valve clearance hole 101 is provided at the middle position of the reinforcing plate layer and the aluminum plate layer, which are connected vertically. A protrusion 105 is provided on the top surface of the aluminum plate layer, which is raised along the outline of the explosion-proof valve clearance hole 101. A welding stepped groove 107 is provided on the bottom surface of the reinforcing plate layer, which is recessed along the outline of the explosion-proof valve clearance hole 101. The explosion-proof valve 400 is made of the same material as the reinforcing plate. The welding stepped groove 107 is used to weld and connect with the top surface of the explosion-proof valve 400. The protrusion 105, which is raised along the outline of the explosion-proof valve clearance hole 101, is used to strengthen the connection strength of the explosion-proof valve 400 welded to the top cover plate. The explosion-proof valve 400 is welded and fixed in the welding stepped groove 107 on the reinforcing plate layer in a way that is of the same material, so that the explosion-proof valve 400 is sealed and fixed firmly by welding.

[0042] When pole post assemblies 300 are installed at both ends of the reinforced composite layer 100, pole post clearance holes 102 are provided at both ends of the reinforcing plate layer and the aluminum plate layer, and pole post assemblies 300 are provided above the pole post clearance holes 102. The pole post assembly 300 includes a plastic sleeve 301, a pole post 302, a welding ring 303, and a sealing ring 304. The sealing ring 304 is set along the contour of the pole post clearance hole 102, and the bottom end face of the sealing ring 304 abuts against the sealing groove 103 formed by the top end face of the reinforcing plate layer, and the top end face abuts against the pole post 302. The pole post 302 is located inside the welding ring 303, and the plastic sleeve 301 is sleeved on the outer periphery of the welding ring 303. The welding ring 303 is an aluminum ring made of aluminum material, and the bottom end face of the aluminum ring is welded to the concave part of the top end face of the aluminum plate layer. The electrode assembly 300 needs to be sealed and welded within the welded stepped groove 104. The electrode clearance hole 102 on the reinforced composite layer 100 requires sealing welding to fix the electrode assembly 300. The electrode assembly 300 is pre-assembled using a plastic shell 301, electrode body 302, welding ring 303, and sealing ring 304 to facilitate sealing and positioning of the sealing ring 304 along the contour of the electrode clearance hole 102. The aluminum welding ring 303 is welded and fixed in the same material to the welded stepped groove 104 on the aluminum plate layer to ensure that the electrode assembly 300 is securely sealed and welded. In addition, when the electrode assembly 300 is welded, a second protrusion 106 is provided on the bottom surface of the reinforcing plate layer, which is formed by protruding along the contour of the electrode clearance hole 102. The second protrusion 106 is used to strengthen the connection strength of the top cover plate welded electrode assembly 300.

[0043] After the explosion-proof valve 400 and the pole assembly 300 are installed on the reinforced composite layer 100, the reinforced composite layer 100 is snapped onto the lower plastic bracket 200. Multiple undercut grooves 108 can be provided at the four edges of the reinforcing plate, and these grooves 108 are matched and snapped together with the undercut posts 201 on the lower plastic bracket 200. This application uses a stamping method to snap-fit ​​the reinforced composite layer 100 onto the lower plastic bracket 200, with the undercut grooves 108 and undercut posts 201 matching and snapping together. This facilitates quick positioning of the reinforced composite layer 100 and the lower plastic bracket 200, and ensures a secure snap-fit ​​connection. Finally, ultrasonic welding can be used to seal the contact surfaces between the reinforced composite layer 100 and the lower plastic bracket 200. When the lower plastic bracket 200 is assembled, it has an explosion-proof valve recess 202 for matching and positioning, and can also have a groove for positioning the protrusion 106.

[0044] Example 3

[0045] Please see Figures 1 to 5 As shown, this utility model is a minimalist composite battery top cover structure, including a rectangular reinforced composite layer 100. The reinforced composite layer 100 includes a reinforcing plate layer and an aluminum plate layer. The reinforcing plate layer is disposed below the aluminum plate layer. The material of the reinforcing plate layer includes, but is not limited to, stainless steel, nickel, titanium, or copper. It should be understood that the material of the reinforcing plate layer can be other metal materials, whose strength is greater than that of aluminum. In this application, a composite design is formed by combining the reinforcing plate layer and the aluminum plate layer. The tensile strength and bending strength of the reinforcing plate layer are greater than those of the aluminum plate layer. The thickness of the reinforced composite layer 100 with the composite design is between 0.6-3.5mm, which ensures the deformation resistance of the top cover sheet while reducing the thickness of the top cover sheet, increasing the shell space, and improving the energy density of the battery.

[0046] In the process of combining the reinforcing plate layer and the aluminum plate layer to form a composite design, the reinforcing plate layer is attached to the bottom surface of the aluminum plate layer to facilitate the overall composite installation of the reinforcing plate layer and the aluminum plate layer.

[0047] When an explosion-proof valve 400 is installed at the middle position of the reinforced composite layer 100, an explosion-proof valve clearance hole 101 that runs vertically through the middle position of the reinforcing plate and the aluminum plate is provided. A welding stepped groove 107 formed by recessing along the outline of the explosion-proof valve clearance hole 101 is provided on the top surface of the aluminum plate. A protrusion 105 formed by protruding along the outline of the explosion-proof valve clearance hole 101 is provided on the bottom surface of the reinforcing plate. The welding stepped groove 107 is used to weld and form a connection with the bottom surface of the aluminum explosion-proof valve 400. In another modified embodiment, the explosion-proof valve can be integrally stamped and formed with the aluminum plate. The protrusion 105 formed by protruding along the outline of the explosion-proof valve clearance hole 101 is used to strengthen the connection strength of the explosion-proof valve 400 welded to the top cover plate. The explosion-proof valve 400 is a valve body made of aluminum material, so that it can be welded and fixed in the welding stepped groove 107 on the aluminum plate with the same material, so that the aluminum explosion-proof valve 400 is sealed and welded and fixed firmly.

[0048] When pole post assemblies 300 are installed at both ends of the reinforced composite layer 100, pole post clearance holes 102 are provided at both ends of the reinforcing plate layer and the aluminum plate layer, and pole post assemblies 300 are provided above the pole post clearance holes 102. The pole post assembly 300 includes a plastic sleeve 301, a pole post 302, a welding ring 303, and a sealing ring 304. The sealing ring 304 is set along the contour of the pole post clearance hole 102, and the bottom end face of the sealing ring 304 abuts against the sealing groove 103 formed by the top end face of the reinforcing plate layer, and the top end face abuts against the pole post 302. The pole post 302 is located inside the welding ring 303, and the plastic sleeve 301 is sleeved on the outer periphery of the welding ring 303. The welding ring 303 is an aluminum ring made of aluminum material, and the bottom end face of the aluminum ring is welded to the concave part of the top end face of the aluminum plate layer. The electrode assembly 300 needs to be sealed and welded within the welded stepped groove 104. The electrode clearance hole 102 on the reinforced composite layer 100 requires sealing welding to fix the electrode assembly 300. The electrode assembly 300 is pre-assembled using a plastic shell 301, electrode body 302, welding ring 303, and sealing ring 304 to facilitate sealing and positioning of the sealing ring 304 along the contour of the electrode clearance hole 102. The aluminum welding ring 303 is welded and fixed in the same material to the welded stepped groove 104 on the aluminum plate layer to ensure that the electrode assembly 300 is securely sealed and welded. In addition, when the electrode assembly 300 is welded, a second protrusion 106 is provided on the bottom surface of the reinforcing plate layer, which is formed by protruding along the contour of the electrode clearance hole 102. The second protrusion 106 is used to strengthen the connection strength of the top cover plate welded electrode assembly 300.

[0049] After the explosion-proof valve 400 and the pole assembly 300 are installed on the reinforced composite layer 100, the reinforced composite layer 100 is snapped onto the lower plastic bracket 200. Multiple undercut grooves 108 are provided at the four edges of the reinforcing plate, and these grooves 108 are matched with the undercut posts 201 on the lower plastic bracket 200 for snap-fit ​​connection. This application uses a stamping method to snap-fit ​​the reinforced composite layer 100 onto the lower plastic bracket 200, with the undercut grooves 108 and undercut posts 201 matching for snap-fit ​​connection. This facilitates quick positioning of the reinforced composite layer 100 and the lower plastic bracket 200, and ensures a secure snap-fit ​​connection. Finally, ultrasonic welding can be used to seal the contact surfaces between the reinforced composite layer 100 and the lower plastic bracket 200. When the lower plastic bracket 200 is assembled, it has grooves for positioning the protrusions 106.

[0050] The above description provides a detailed account of one embodiment of the present invention. However, this description is merely a preferred embodiment and should not be construed as limiting the scope of the present invention. All equivalent variations and improvements made within the scope of the claims of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A minimalist composite battery top cover structure, characterized in that, The device includes a rectangular reinforced composite layer (100), an explosion-proof valve (400) is installed in the middle of the reinforced composite layer (100), and pole assembly (300) is installed at both ends of the reinforced composite layer (100). The reinforced composite layer (100) is snapped onto the lower plastic bracket (200). The thickness of the reinforcing composite layer (100) is 0.6-3.5 mm; The reinforced composite layer (100) includes a reinforcing plate layer and an aluminum plate layer, wherein the strength of the reinforcing plate layer is greater than that of the aluminum plate layer; The reinforcing plate layer is disposed above or below the aluminum plate layer; When the reinforcing plate layer is placed above the aluminum plate layer, the outline edge of the aluminum plate layer is turned upward to form a covering groove, and the reinforcing plate layer is fitted and installed in the covering groove. An explosion-proof valve clearance hole (101) is provided at the middle position of the reinforcing plate and the aluminum plate. A protrusion (105) is provided on the top surface of the reinforcing plate along the outline of the explosion-proof valve clearance hole (101). A welding stepped groove (107) is provided on the bottom surface of the aluminum plate along the outline of the explosion-proof valve clearance hole (101). The welding stepped groove (107) is used to weld and connect with the top surface of the explosion-proof valve (400) made of aluminum material. The reinforcing plate and the aluminum plate are provided with pole clearance holes (102) that are connected vertically at both ends. A pole assembly (300) is provided above the pole clearance hole (102). The pole assembly (300) includes a plastic shell (301), a pole body (302), a welding ring (303) and a sealing ring (304). The sealing ring (304) is set along the outline of the pole clearance hole (102). The bottom end face of the sealing ring (304) abuts against the sealing groove (103) formed by the top end face of the aluminum plate and the top end face abuts against the pole body (302). The bottom end face of the welding ring (303) is welded into the welding stepped groove (104) formed by the indentation of the top end face of the reinforcing plate. The aluminum plate layer has multiple undercut grooves (108) at its four edges, and the undercut grooves (108) are adapted to and snapped together with the undercut posts (201) on the lower plastic bracket (200).

2. The composite battery minimalist top cover structure according to claim 1, characterized in that, The pole piece (302) is located inside the welding ring (303), and a plastic sleeve (301) is fitted on the outer periphery of the welding ring (303); The welding ring (303) is made of the same material as the reinforcing plate layer.

3. The composite battery minimalist top cover structure according to claim 1, characterized in that, When the reinforcing plate layer is located below the aluminum plate layer, the reinforcing plate layer is attached to the bottom surface of the aluminum plate layer.

4. The composite battery minimalist top cover structure according to claim 1, characterized in that, An explosion-proof valve clearance hole (101) is provided at the middle position of the reinforcing plate and the aluminum plate. A protrusion (105) is provided on the top surface of the aluminum plate along the outline of the explosion-proof valve clearance hole (101). A welding stepped groove (107) is provided on the bottom surface of the reinforcing plate along the inward outline of the explosion-proof valve clearance hole (101). The explosion-proof valve (400) is made of the same material as the reinforcing plate. The welding stepped groove (107) is used to weld and connect with the top surface of the explosion-proof valve (400).

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