A minimalist top cover structure for a split battery

Abstract

This utility model discloses a minimalist split-type battery top cover structure, comprising a reinforcing plate layer, an aluminum plate layer, and a lower plastic bracket arranged in layers from top to bottom, and the three are fixedly connected by snap-fit ​​connections. An explosion-proof valve is installed in the middle of the reinforcing plate layer and the aluminum plate layer, and terminal post assemblies are installed at both ends of the reinforcing plate layer and the aluminum plate layer, respectively. This application employs a split-assembly design using the reinforcing plate layer, aluminum plate layer, and lower plastic bracket. The tensile and bending strength of the reinforcing plate layer is greater than that of the aluminum plate layer. The thickness of the top cover layer after assembly of the reinforcing plate layer and the aluminum plate layer is between 0.6 and 3.5 mm, which ensures the deformation resistance of the top cover while reducing the thickness of the top cover layer, increasing the casing space, and improving the energy density of the battery.

Description

Technical Field

[0001] This utility model relates to the field of battery top cover structure technology, specifically to a split-type 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 the latest demands. As an important 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 conflict between strength and thickness.

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

[0005] The purpose of this invention is to provide a simplified split-type battery 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 split-type battery minimalist top cover structure includes a reinforcing plate layer, an aluminum plate layer and a lower plastic bracket arranged in layers from top to bottom, and the three are connected and fixed by snap-fit. An explosion-proof valve is installed in the middle of the reinforcing plate layer and the aluminum plate layer, and an electrode assembly is installed at both ends of the reinforcing plate layer and the aluminum plate layer respectively.

[0008] The thickness of the layer composed of the reinforcing plate and the aluminum plate is 0.6-3.5 mm.

[0009] As a further aspect of this utility model, 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.

[0010] As a further embodiment of this utility model: an explosion-proof valve clearance hole is provided in the middle position of the reinforcing plate layer, and the aluminum plate layer and the explosion-proof valve are integrally formed or separately assembled and connected.

[0011] As a further embodiment of this utility model: when the aluminum plate layer and the explosion-proof valve are assembled and connected separately, an explosion-proof valve lower clearance hole is provided at the middle position of the aluminum plate layer, which is vertically aligned with the upper clearance hole of the explosion-proof valve. A second welding stepped groove is provided on the bottom surface of the aluminum plate layer, which is recessed along the outline of the lower clearance hole of the explosion-proof valve. The second welding stepped groove is used to weld and connect with the top surface of the explosion-proof valve made of aluminum material.

[0012] As a further embodiment of this utility model: an explosion-proof valve recess is provided at the middle position of the lower plastic bracket for compatibility with the explosion-proof valve.

[0013] As a further embodiment of this utility model: the top surface of the reinforcing plate is provided with a protrusion formed by the protrusion along the clearance hole of the explosion-proof valve.

[0014] As a further embodiment of this utility model: the pole assembly includes a plastic shell, a pole body, a welding ring and a sealing ring. The sealing ring is set along the outline of the clearance hole on the pole on the aluminum plate layer, 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 body. The pole body is located inside the welding ring, and a plastic shell is fitted on the outer periphery of the welding ring.

[0015] As a further embodiment of this utility model: the reinforcing plate has a through hole for pole assembly, the welding ring is made of the same material as the reinforcing plate, and the bottom end face of the welding ring is welded into a welding stepped groove formed by the indentation of the top surface of the reinforcing plate.

[0016] As a further embodiment of this utility model: the lower plastic bracket is provided with a lower pole clearance hole that is vertically aligned with the clearance hole on the pole post, and the lower plastic bracket is provided with a groove that matches the second protrusion. The second protrusion is provided on the bottom surface of the aluminum plate layer, and the second protrusion is formed by protruding along the outline of the clearance hole on the pole post.

[0017] As a further embodiment of this utility model: the reinforcing plate layer is provided with a plurality of undercut slots at its four edges, and the undercut slots are adapted to and snapped together with the undercut posts on the top surface of the aluminum plate layer; the lower plastic bracket is provided with a plurality of undercut posts at its four edges, and the undercut posts are adapted to and snapped together with the undercut slots on the bottom surface of the aluminum plate layer.

[0018] The beneficial effects of this utility model are:

[0019] (1) In this application, a split assembly design is adopted with a reinforcing plate layer, an aluminum plate layer and a lower plastic bracket. The tensile strength and bending strength of the reinforcing plate layer are greater than those of the aluminum plate layer. The thickness of the top cover layer after the reinforcing plate layer and the aluminum plate layer are assembled is between 0.6-3.5mm. This 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.

[0020] (2) The explosion-proof valve of this application can be integrally formed or assembled and connected separately on the aluminum plate layer to meet the design and use of the explosion-proof valve structure with integral installation on the top cover or the explosion-proof valve structure with non-integral installation.

[0021] (3) In this application, a split assembly design is adopted with a reinforcing plate layer, an aluminum plate layer and a lower plastic bracket to achieve rapid overall positioning of the top cover piece, and the snap-fit ​​connection is reliable, so as to enhance the interlayer bonding force and avoid the risk of delamination;

[0022] (4) 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 split schematic diagram of one embodiment of the present invention;

[0026] Figure 3 This is a split diagram of another embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of the aluminum plate layer of this utility model from a bottom view.

[0028] Figure 5 This is a bottom view of the pole assembly of this utility model;

[0029] Figure 6 This is a schematic diagram of the disassembled pole assembly of this utility model.

[0030] In the diagram: 100, Reinforcing plate layer; 101, Explosion-proof valve upper clearance hole; 102, Protrusion 1; 103, Through hole for pole assembly; 104, Welding stepped groove 1; 105, Undercut groove 1; 200, Aluminum plate layer; 201, Upper clearance hole for pole; 202, Sealing groove; 203, Undercut post 1; 204, Lower clearance hole for explosion-proof valve.

[0031] 205. Welded stepped groove II; 206. Protrusion II; 207. Undercut groove II; 300. Lower plastic bracket; 301. Explosion-proof valve recess; 302. Lower clearance hole of pole post; 303. Groove; 304. Undercut post II; 400. Explosion-proof valve; 500. Pole post assembly; 501. Plastic sleeve; 502. Pole post body; 503. Welding ring; 504. Sealing ring. Detailed Implementation

[0032] 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 scope of protection of the present utility model. In the description of the present 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 drawings, and are only for the convenience of describing the present 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 the present utility model; in the description of the present utility model, "a plurality of" or "several" means at least two, such as two, three, etc., unless otherwise explicitly and specifically defined.

[0033] Example 1

[0034] Please see Figure 1 , Figure 2 as well as Figures 4 to 6 As shown, this utility model is a minimalist split-type battery top cover structure, including a reinforcing plate layer 100, an aluminum plate layer 200, and a lower plastic bracket 300 arranged in layers from top to bottom, and the three are connected and fixed by snap-fit. The material of the reinforcing plate layer 100 includes, but is not limited to, stainless steel, nickel, titanium, or copper. It should be understood that the material of the reinforcing plate layer 100 can be other metal materials, and its strength should be greater than that of the aluminum plate layer 200. In this application, the reinforcing plate layer 100, the aluminum plate layer 200, and the lower plastic bracket 300 are used for a split assembly design. The tensile strength and bending strength of the reinforcing plate layer 100 are greater than that of the aluminum plate layer 200. The thickness of the top cover layer after the reinforcing plate layer 100 and the aluminum plate layer 200 are assembled 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.

[0035] When the explosion-proof valve 400 is installed together at the middle position of the reinforcing plate 100 and the aluminum plate 200, the aluminum plate 200 and the explosion-proof valve 400 can be integrally formed. The aluminum plate 200 and the explosion-proof valve 400 can be prefabricated and stamped directly, which can shorten the assembly time. When the explosion-proof valve 400 is assembled, an explosion-proof valve upper clearance hole 101 is opened at the middle position of the reinforcing plate 100, and an explosion-proof valve groove 301 for matching the explosion-proof valve 400 is provided at the middle position of the lower plastic bracket 300. A protrusion 102 is provided on the top surface of the reinforcing plate 100 along the explosion-proof valve upper clearance hole 101. The protrusion 102 is used to strengthen the strength of the top cover plate.

[0036] When pole post assemblies 500 are installed at both ends of the reinforcing plate layer 100 and the aluminum plate layer 200, the pole post assembly 500 includes a plastic shell 501, a pole post 502, a welding ring 503, and a sealing ring 504. The sealing ring 504 is set along the outline of the clearance hole 201 on the pole post on the aluminum plate layer 200, and the bottom end face of the sealing ring 504 abuts against the sealing groove 202 formed by the top end face of the aluminum plate layer 200, and the top end face abuts against the pole post 502. The pole post 502 is located inside the welding ring 503, and the plastic shell 501 is sleeved on the outer periphery of the welding ring 503. A pole post assembly through hole 103 is opened on the reinforcing plate layer 100. The welding ring 503 is made of the same material as the reinforcing plate layer 100. The bottom end face of the welding ring 503 is welded into the welding stepped groove 104 formed by the indentation of the top end face of the reinforcing plate layer 100.

[0037] When the electrode assembly 500 is sealed and welded, it is pre-assembled using a plastic sleeve 501, an electrode body 502, a welding ring 503, and a sealing ring 504. This facilitates the sealing ring 504 to be sealed and positioned along the contour of the clearance hole 201 on the electrode, and the welding ring 503 is welded and fixed to the same material in the welding stepped groove 104 on the reinforcing plate layer 100, so that the electrode assembly 500 is securely sealed and welded. Furthermore, the electrode assembly... When the body 500 is welded together, the lower plastic bracket 300 is provided with a lower pole clearance hole 302 that is vertically aligned with the clearance hole 201 on the pole, and the lower plastic bracket 300 is provided with a groove 303 that is adapted to the second protrusion 206. The second protrusion 206 is provided on the bottom end surface of the aluminum plate layer 200, and the second protrusion 206 is formed by protruding along the outline of the clearance hole 201 on the pole. The second protrusion 206 is used to strengthen the connection strength of the top cover plate welded pole assembly 500.

[0038] After the explosion-proof valve 400 and the pole assembly 500 are assembled, the reinforcing plate 100, the aluminum plate 200, and the lower plastic bracket 300 are connected and fixed with snap-fit. The reinforcing plate 100 has multiple undercut slots 105 at its four edges, which are matched with undercut posts 203 on the top surface of the aluminum plate 200 for snap-fit ​​connection. The lower plastic bracket 300 has multiple undercut posts 304 at its four edges, which are matched with undercut posts 203 on the bottom surface of the aluminum plate 200 for snap-fit ​​connection. The inverted slot 207 is adapted to the snap-fit ​​connection; this application uses a stamping method to snap-fit ​​the reinforcing plate 100, aluminum plate 200 and lower plastic bracket 300 together. The inverted slot 105 is adapted to the snap-fit ​​connection with the inverted post 203, and the inverted slot 207 is adapted to the snap-fit ​​connection with the inverted post 304, so as to facilitate the quick positioning of the top cover piece as a whole, and the snap-fit ​​connection is reliable. Finally, the contact surface between the aluminum plate 200 and the lower plastic bracket 300 can be sealed by ultrasonic welding.

[0039] Example 2

[0040] Please see Figure 1 as well as Figures 3 to 6 As shown, this utility model is a minimalist split-type battery top cover structure, including a reinforcing plate layer 100, an aluminum plate layer 200, and a lower plastic bracket 300 arranged in layers from top to bottom, and the three are connected and fixed by snap-fit. The material of the reinforcing plate layer 100 includes, but is not limited to, stainless steel, nickel, titanium, or copper. It should be understood that the material of the reinforcing plate layer 100 can be other metal materials, and its strength should be greater than that of the aluminum plate layer 200. In this application, the reinforcing plate layer 100, the aluminum plate layer 200, and the lower plastic bracket 300 are used for a split assembly design. The tensile strength and bending strength of the reinforcing plate layer 100 are greater than that of the aluminum plate layer 200. The thickness of the top cover layer after the reinforcing plate layer 100 and the aluminum plate layer 200 are assembled 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.

[0041] When the explosion-proof valve 400 is installed together at the middle position of the reinforcing plate 100 and the aluminum plate 200, the aluminum plate 200 and the explosion-proof valve 400 can be assembled separately to facilitate the design of a non-integrated explosion-proof valve 400 installation structure. During the assembly of the explosion-proof valve 400, a lower clearance hole 204 for the explosion-proof valve is provided at the middle position of the aluminum plate 200, vertically aligned with the upper clearance hole 101 of the explosion-proof valve. A second welded stepped groove 205, recessed along the contour of the lower clearance hole 204, is provided on the bottom surface of the aluminum plate 200. The second welded stepped groove 205 is used to connect with the top surface of the aluminum explosion-proof valve 400. The welded connection includes an explosion-proof valve clearance hole 101 at the middle of the reinforcing plate 100. The explosion-proof valve 400 has an aluminum valve body, which is welded and fixed to the aluminum plate 200 in the welding stepped groove 205 of the same material, so that the aluminum explosion-proof valve 400 is sealed and welded securely. In addition, the lower plastic bracket 300 has an explosion-proof valve recess 301 at the middle for matching the explosion-proof valve 400. The top surface of the reinforcing plate 100 has a protrusion 102 formed by protruding along the explosion-proof valve clearance hole 101. The protrusion 102 is used to strengthen the strength of the top cover plate.

[0042] When pole post assemblies 500 are installed at both ends of the reinforcing plate layer 100 and the aluminum plate layer 200, the pole post assembly 500 includes a plastic shell 501, a pole post 502, a welding ring 503, and a sealing ring 504. The sealing ring 504 is set along the outline of the clearance hole 201 on the pole post on the aluminum plate layer 200, and the bottom end face of the sealing ring 504 abuts against the sealing groove 202 formed by the top end face of the aluminum plate layer 200, and the top end face abuts against the pole post 502. The pole post 502 is located inside the welding ring 503, and the plastic shell 501 is sleeved on the outer periphery of the welding ring 503. A pole post assembly through hole 103 is opened on the reinforcing plate layer 100. The welding ring 503 is made of the same material as the reinforcing plate layer 100. The bottom end face of the welding ring 503 is welded into the welding stepped groove 104 formed by the indentation of the top end face of the reinforcing plate layer 100.

[0043] When the electrode assembly 500 is sealed and welded, it is pre-assembled using a plastic sleeve 501, an electrode body 502, a welding ring 503, and a sealing ring 504. This facilitates the sealing ring 504 to be sealed and positioned along the contour of the clearance hole 201 on the electrode, and the welding ring 503 is welded and fixed to the same material in the welding stepped groove 104 on the reinforcing plate layer 100, so that the electrode assembly 500 is securely sealed and welded. Furthermore, the electrode assembly... When the body 500 is welded together, the lower plastic bracket 300 is provided with a lower pole clearance hole 302 that is vertically aligned with the clearance hole 201 on the pole, and the lower plastic bracket 300 is provided with a groove 303 that is adapted to the second protrusion 206. The second protrusion 206 is provided on the bottom end surface of the aluminum plate layer 200, and the second protrusion 206 is formed by protruding along the outline of the clearance hole 201 on the pole. The second protrusion 206 is used to strengthen the connection strength of the top cover plate welded pole assembly 500.

[0044] After the explosion-proof valve 400 and the pole assembly 500 are assembled, the reinforcing plate 100, the aluminum plate 200, and the lower plastic bracket 300 are snap-fitted together. The reinforcing plate 100 has multiple undercut slots 105 at its four edges, which are matched with undercut posts 203 on the top surface of the aluminum plate 200. The lower plastic bracket 300 has multiple undercut posts 304 at its four edges, which are matched with undercut slots 207 on the bottom surface of the aluminum plate 200. This application uses a stamping method to snap-fit ​​the reinforcing plate 100, the aluminum plate 200, and the lower plastic bracket 300 together, with the undercut slots 105 matching the undercut posts 203.

[0045] The connection, and the adapter buckle connection between the inverted slot hole 207 and the inverted column 304, are used to facilitate the quick positioning of the top cover piece as a whole, and the buckle connection is reliable. Finally, the contact surface between the aluminum plate layer 200 and the lower plastic bracket 300 can be sealed by ultrasonic welding.

[0046] It should be understood that in Embodiments 1 and 2, the reinforcing plate layer can be placed above or below the aluminum plate layer, and can be selectively applied according to actual needs.

[0047] 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 split-type battery top cover structure, characterized in that, It includes a reinforcing plate layer (100), an aluminum plate layer (200) and a lower plastic bracket (300) arranged in layers from top to bottom, and the three are connected and fixed by snap-fit. An explosion-proof valve (400) is installed in the middle of the reinforcing plate layer (100) and the aluminum plate layer (200), and pole assembly (500) is installed at both ends of the reinforcing plate layer (100) and the aluminum plate layer (200). The thickness of the layer composed of the reinforcing plate layer (100) and the aluminum plate layer (200) is 0.6-3.5 mm. The pole assembly (500) includes a plastic shell (501), a pole body (502), a welding ring (503), and a sealing ring (504). The sealing ring (504) is arranged along the outline of the clearance hole (201) on the pole on the aluminum plate layer (200), and the bottom end face of the sealing ring (504) abuts against the sealing groove (202) formed by the top end face of the aluminum plate layer (200), and the top end face abuts against the pole body (502). The pole body (502) is located inside the welding ring (503), and the plastic shell (501) is sleeved on the outer periphery of the welding ring (503). The reinforcing plate (100) is provided with a pole assembly through hole (103), and the welding ring (503) is made of the same material as the reinforcing plate (100). The bottom end face of the welding ring (503) is welded into the welding stepped groove (104) formed by the indentation of the top end face of the reinforcing plate (100). The lower plastic bracket (300) is provided with a lower pole clearance hole (302) that is vertically aligned with the clearance hole (201) on the pole post, and the lower plastic bracket (300) is provided with a groove (303) that is adapted to the second protrusion (206). The second protrusion (206) is provided on the bottom end surface of the aluminum plate layer (200), and the second protrusion (206) is formed by protruding along the outline of the clearance hole (201) on the pole post. The reinforcing plate layer (100) has multiple undercut slots (105) at its four edges, and the undercut slots (105) are adapted to and snapped together with the undercut posts (203) on the top surface of the aluminum plate layer (200); the lower plastic bracket (300) has multiple undercut posts (304) at its four edges, and the undercut posts (304) are adapted to and snapped together with the undercut slots (207) on the bottom surface of the aluminum plate layer (200).

2. The simplified top cover structure for a split battery according to claim 1, characterized in that, The strength of the reinforcing plate layer (100) must be greater than that of the aluminum plate layer (200).

3. The simplified top cover structure for a split battery according to claim 2, characterized in that, An explosion-proof valve clearance hole (101) is provided in the middle of the reinforcing plate layer (100). The aluminum plate layer (200) and the explosion-proof valve (400) are integrally formed or separately assembled and connected.

4. The simplified top cover structure for a split battery according to claim 3, characterized in that, When the aluminum plate layer (200) and the explosion-proof valve (400) are assembled and connected separately, an explosion-proof valve lower clearance hole (204) is opened at the middle position of the aluminum plate layer (200) and is vertically aligned with the upper clearance hole (101) of the explosion-proof valve. A second welding stepped groove (205) is provided on the bottom surface of the aluminum plate layer (200) and is recessed along the outline of the lower clearance hole (204) of the explosion-proof valve. The second welding stepped groove (205) is used to weld and connect with the top surface of the aluminum explosion-proof valve (400).

5. The simplified top cover structure for a split battery according to claim 4, characterized in that, The lower plastic bracket (300) is provided with an explosion-proof valve recess (301) at the middle position for matching with the explosion-proof valve (400).

6. The simplified top cover structure for a split battery according to claim 4, characterized in that, The top surface of the reinforcing plate (100) is provided with a protrusion (102) formed by protruding along the clearance hole (101) of the explosion-proof valve.

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