Secondary battery top cover assembly

Abstract

The utility model provides a top cover assembly of a secondary battery, and relates to the field of batteries. The top cover assembly of the secondary battery comprises a top cover sheet, lower plastic cement, a pole, upper plastic cement and a connecting block, the lower plastic, the top cover sheet and the upper plastic are stacked in sequence; and one end of the pole sequentially penetrates through the lower plastic, the top cover sheet and the upper plastic and is screwed with the connecting block. According to the secondary battery top cover assembly provided by the invention, the technical problems that the flatness of the top cover is influenced and the top cover is not tightly sealed due to the deformation of the pole during riveting in the prior art are solved.

Description

Technical Field

[0001] This application relates to the field of batteries, and more specifically, to a secondary battery top cover assembly. Background Technology

[0002] The riveted top cover used in current secondary batteries generally consists of two positioning plates, an explosion-proof valve protective patch, two upper plastic parts, a top cover plate, an explosion-proof valve, two sealing rings, a lower plastic part, a negative terminal, and a positive terminal. The negative terminal is typically made of a copper-aluminum composite plate or copper and aluminum joined together using friction welding or similar processes, resulting in a structure with an aluminum upper surface and a copper lower surface. The positive terminal (including the positive and negative terminals of sodium-ion secondary batteries) is made of a single aluminum block. The top cover is riveted downwards by a cylinder to deform the terminal, locking the positioning plates, compressing the thickness of the sealing rings, and preventing the sealing rings from springing back. This provides a sealing effect, followed by assembly and injection molding for curing. The anti-rotation feature of the terminal is achieved by the square base of the terminal engaging with the recessed terminal position on the lower surface of the top cover plate and the protruding terminal position on the lower plastic part, thus preventing rotation.

[0003] The above structure has the following drawbacks:

[0004] 1) Since the top cover is a riveted structure, it needs to be riveted downwards by a cylinder to deform the pole post and lock the positioning piece for positioning. After riveting, the upper surface of the pole post will deform, affecting the flatness and dimensional accuracy of the top cover.

[0005] 2) The anti-rotation structure of the top cover is achieved by the lower surface of the pole and the lower plastic, and the groove on the lower surface of the top cover plate. When the pole deforms, the top cover plate and the lower plastic will be damaged, resulting in poor sealing of the top cover and affecting the insulation of the lower part of the top cover plate, causing the top cover plate to be scrapped. If it is not effectively selected during the processing and is missed at the cell end, it will cause the cell tab to short-circuit with the top cover plate, creating a safety risk. Utility Model Content

[0006] The purpose of this application is to provide a secondary battery top cover assembly to alleviate the technical problems in the prior art, such as deformation of the electrode post during riveting, affecting the flatness of the top cover, and poor sealing of the top cover.

[0007] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows:

[0008] The secondary battery top cover assembly provided by this utility model includes a top cover sheet, a lower plastic part, an electrode post, an upper plastic part, and a connecting block.

[0009] The lower plastic, the top cover sheet, and the upper plastic are stacked in sequence;

[0010] One end of the pole passes through the lower plastic, the top cover plate and the upper plastic in sequence, and is screwed to the connecting block.

[0011] Furthermore, the pole post includes a first limiting protrusion and a connecting protrusion, the connecting protrusion being connected to the first limiting protrusion;

[0012] The connecting block is provided with a screw-in groove, and the connecting protrusion extends into the screw-in groove and screws into the screw-in groove.

[0013] Furthermore, the outer wall of the connecting protrusion is provided with a buckle, and the side wall of the screw-in groove is provided with a slot, the buckle engaging with the slot.

[0014] Furthermore, the depth of the screw-in groove is equal to the height of the connecting protrusion.

[0015] Furthermore, the pole also includes a motherboard, and the two ends of the first limiting protrusion are respectively connected to the motherboard and the connecting protrusion;

[0016] The connecting block includes a connecting body and a second limiting protrusion. One end of the second limiting protrusion is connected to the connecting body, and the other end is provided with the screw-in groove.

[0017] Furthermore, the connecting body is provided with a first anti-rotation structure, the upper surface of the upper plastic is provided with a second anti-rotation structure, the lower surface is provided with a third anti-rotation structure, and the upper surface of the top cover is provided with a fourth anti-rotation structure.

[0018] The first anti-rotation structure cooperates with the second anti-rotation structure to prevent the connecting body from rotating relative to the upper plastic.

[0019] The third anti-rotation structure works in conjunction with the fourth anti-rotation structure to prevent the upper plastic from rotating relative to the top cover sheet.

[0020] Furthermore, the first anti-rotation structure is configured as a first groove and is located on the surface of the connecting body where the second limiting protrusion is provided, and the bottom wall of the first groove is configured as a first inclined surface;

[0021] The second anti-rotation structure is configured as a first protrusion, and the third anti-rotation structure is configured as a second groove. The surface of the first protrusion is configured as a second inclined surface, and the bottom wall of the second groove is configured as a third inclined surface. The inclination direction of the second inclined surface is the same as the screwing direction of the connecting block. The first protrusion is inserted into the first groove, and the second inclined surface is in contact with the first inclined surface.

[0022] The fourth anti-rotation structure is configured as a second protrusion, the surface of the second protrusion is configured as a fourth inclined surface, the inclination direction of the fourth inclined surface is the same as the screwing direction of the connecting block, the second protrusion is inserted into the second groove, and the fourth inclined surface is in contact with the third inclined surface.

[0023] Furthermore, multiple first grooves, first protrusions, second grooves, and second protrusions are provided, and multiple first grooves are spaced apart along the circumferential direction of the connecting body;

[0024] Each of the first protrusions, the second grooves, and the second protrusions is provided in a one-to-one correspondence with the first grooves.

[0025] Furthermore, both the horizontal cross-section of the connecting body and the horizontal cross-section of the upper plastic are set as regular hexagons.

[0026] Furthermore, the electrode post includes a positive electrode post and a negative electrode post, and two connecting blocks are provided;

[0027] The positive terminal and the negative terminal are spaced apart along the length of the top cover plate and are respectively screwed into the two connecting blocks.

[0028] Based on the above technical solutions, the technical effects achievable by this utility model can be analyzed as follows:

[0029] The secondary battery top cover assembly provided by this utility model includes a top cover sheet, a lower plastic, a terminal post, an upper plastic and a connecting block; the lower plastic, the top cover sheet and the upper plastic are stacked in sequence; one end of the terminal post passes through the lower plastic, the top cover sheet and the upper plastic in sequence, and is screwed to the connecting block.

[0030] In this secondary battery top cover assembly, the terminals and connecting blocks are connected by screwing to fix the distance between the surface of the terminals and the surface of the connecting blocks. This will not affect the flatness of the upper surface of the terminals or the connecting blocks, and can effectively reduce the damage to the insulating plastic caused by strong riveting. This will reduce the risk of leakage caused by battery insulation problems and abnormal sealing of the top cover assembly due to damage to the insulating plastic. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 An exploded view of the secondary battery top cover assembly provided in an embodiment of this application;

[0033] Figure 2 A schematic diagram of the terminal post structure in the secondary battery top cover assembly provided in this application embodiment. Figure 1 ;

[0034] Figure 3A schematic diagram of the terminal post structure in the secondary battery top cover assembly provided in this application embodiment. Figure 2 ;

[0035] Figure 4 This is a schematic diagram of the connecting block in the secondary battery top cover assembly provided in an embodiment of this application;

[0036] Figure 5 This is a schematic diagram of the internal structure of the connecting block in the secondary battery top cover assembly provided in an embodiment of this application;

[0037] Figure 6 This is a schematic diagram illustrating the fit between the connecting block and the terminal post in the secondary battery top cover assembly provided in this application embodiment. Figure 1 ;

[0038] Figure 7 This is a schematic diagram illustrating the fit between the connecting block and the terminal post in the secondary battery top cover assembly provided in this application embodiment. Figure 2 ;

[0039] Figure 8 This is a schematic diagram illustrating the fit between the connecting block and the terminal post in the secondary battery top cover assembly provided in this application embodiment. Figure 3 ;

[0040] Figure 9 This is a schematic diagram of the structure of the top cover sheet in the secondary battery top cover assembly provided in the embodiments of this application. Figure 1 ;

[0041] Figure 10 This is a schematic diagram of the structure of the upper plastic in the secondary battery top cover assembly provided in the embodiments of this application. Figure 1 (The top surface is shown);

[0042] Figure 11 This is a schematic diagram of the structure of the upper plastic in the secondary battery top cover assembly provided in the embodiments of this application. Figure 2 (The bottom surface is shown).

[0043] Figure 12 This is a schematic diagram of the internal structure of the secondary battery top cover assembly provided in an embodiment of this application;

[0044] Figure 13 for Figure 12 A magnified view of a section at point A in the middle;

[0045] Figure 14 This is a schematic diagram of the structure of the top cover sheet in the secondary battery top cover assembly provided in the embodiments of this application. Figure 2 ;

[0046] Figure 15 This is a schematic diagram of the internal structure of the top cover sheet in the secondary battery top cover assembly provided in the embodiments of this application;

[0047] Figure 16for Figure 15 A magnified view of a section at point B in the middle;

[0048] Figure 17 This is a schematic diagram of the structure of the upper plastic in the secondary battery top cover assembly provided in the embodiments of this application. Figure 3 ;

[0049] Figure 18 This is a schematic diagram of the internal structure of the upper plastic in the secondary battery top cover assembly provided in this application embodiment.

[0050] icon:

[0051] 1-Top cover plate; 11-Second protrusion;

[0052] 2-Lower plastic; 21-Dent;

[0053] 3-Terminal post; 31-Positive terminal post; 32-Negative terminal post; 33-Main board; 34-First limit protrusion; 35-Connecting protrusion; 351-Turn buckle;

[0054] 4- Upper plastic; 41- First protrusion; 42- Second groove;

[0055] 5-Connecting block; 51-Connecting body; 511-First groove; 52-Second limiting protrusion; 521-Screwing groove; 522-Slot;

[0056] 6-Sealing ring;

[0057] 7-Explosion-proof valve;

[0058] 8-Explosion-proof valve protection patch. Detailed Implementation

[0059] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0060] In the description of this application, it should be noted that the terms "inner" and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0061] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0062] See Figures 1 to 18 The secondary battery top cover assembly provided in this embodiment of the utility model includes a top cover sheet 1, a lower plastic sheet 2, an electrode post 3, an upper plastic sheet 4, and a connecting block 5; the lower plastic sheet 2, the top cover sheet 1, and the upper plastic sheet 4 are stacked in sequence; one end of the electrode post 3 passes through the lower plastic sheet 2, the top cover sheet 1, and the upper plastic sheet 4 in sequence, and is screwed to the connecting block 5.

[0063] Specifically, both the top cover 1 and the lower plastic piece 2 are rectangular, and their lengths are aligned. See also Figure 1 The secondary battery top cover assembly also includes an explosion-proof valve protection patch 8 and an explosion-proof valve 7. The explosion-proof valve 7 is installed on the lower plastic piece 2 and extends into the through hole of the top cover piece 1. The explosion-proof valve protection patch 8 is installed on the explosion-proof valve 7. Furthermore, the terminal post 3 includes a positive terminal post 31 and a negative terminal post 32, and two connecting blocks 5 are provided. The positive terminal post 31 and the negative terminal post 32 are spaced apart along the length direction of the top cover piece 1 and are respectively screwed to the two connecting blocks 5. The explosion-proof valve 7 is installed between the positive terminal post 31 and the negative terminal post 32.

[0064] In this secondary battery top cover assembly, the terminal post 3 and the connecting block 5 are connected by a screw connection to fix the distance between the surface of the terminal post 3 and the surface of the connecting block 5. This will not affect the flatness of the upper surface of the terminal post 3 or the connecting block 5, and can effectively reduce the damage to the insulating plastic caused by strong riveting, thereby reducing the risk of leakage caused by battery insulation problems and abnormal sealing of the top cover assembly due to damage to the insulating plastic.

[0065] The structure and shape of the secondary battery top cover assembly are described in detail below:

[0066] In the optional embodiments of this utility model, see Figure 2 and Figure 3 The pole post 3 includes a first limiting protrusion 34 and a connecting protrusion 35, the connecting protrusion 35 being connected to the first limiting protrusion 34; see also Figure 4 and Figure 5 The connecting block 5 is provided with a screw-in groove 521, and the connecting protrusion 35 extends into the screw-in groove 521 and screws into the screw-in groove 521.

[0067] Specifically, the first limiting protrusion 34 is cylindrical. When the connecting protrusion 35 is screwed into the screw groove 521, there is a gap between the connecting block 5 and the pole post 3 for installing the lower plastic 2, the top cover plate 1 and the upper plastic 4.

[0068] The connecting protrusion 35 and the screw-in groove 521 are screwed together to realize the screw connection between the terminal post 3 and the connecting block 5; a first limiting protrusion 34 is provided below the connecting protrusion 35 to fix the distance between the surface of the terminal post 3 and the surface of the connecting block 5, without affecting the flatness of the upper surface of the terminal post 3 or the flatness of the connecting block 5, and can effectively reduce the damage to the insulating plastic caused by strong riveting, reduce the risk of leakage caused by battery insulation problems and abnormal sealing of the top cover assembly due to damage to the insulating plastic.

[0069] In the optional embodiments of this utility model, see Figure 2 The outer wall of the connecting protrusion 35 is provided with a swivel 351, see [reference]. Figure 4 The side wall of the screw-in groove 521 is provided with a slot 522, and the screw buckle 351 cooperates with the slot 522.

[0070] Specifically, multiple swivel buckles 351 are provided, and the multiple swivel buckles 351 are spaced apart circumferentially along the connecting protrusion 35; correspondingly, multiple slots 522 are provided, and the multiple slots 522 are screwed into the multiple swivel buckles 351 one by one. Furthermore, the swivel buckles 351 engage with the slots 522, and are locked at the end to prevent loosening when rotated.

[0071] The swivel 351 engages with the slot 522 to achieve the connection between the protrusion 35 and the swivel groove 521.

[0072] In an optional embodiment of this utility model, the depth of the screw-in groove 521 is equal to the height of the connecting protrusion 35.

[0073] Specifically, see Figure 6 and Figure 8 The connecting block 5 and the connecting protrusion 35 cooperate with each other. The swivel 351 on the outer wall of the connecting protrusion 35 cooperates with the slot 522 of the swivel groove 521. The depth of the swivel groove is equal to the height of the connecting protrusion 35. This can ensure that the distance between the pole post 3 and the connecting block 5 meets the requirements when the pole post 3 and the connecting block 5 are rotated to the limit. This avoids the problem of deformation of the top cover 1, the upper plastic 4, the lower plastic 2 or the pole post 3 due to the small distance between the pole post 3 and the connecting block 5.

[0074] The depth of the screw groove 521 is equal to the height of the connecting protrusion 35, which can effectively prevent the problem of parts deformation caused by excessive tightening during installation.

[0075] In an optional embodiment of this utility model, the pole post 3 further includes a main board 33, and the two ends of the first limiting protrusion 34 are respectively connected to the main board 33 and the connecting protrusion 35; the connecting block 5 includes a connecting body 51 and a second limiting protrusion 52, one end of the second limiting protrusion 52 is connected to the connecting body 51, and the other end is provided with a screw-in groove 521.

[0076] Specifically, the connecting block 5 cooperates with the connecting protrusion 35, and the swivel 351 on the outer wall of the connecting protrusion 35 cooperates with the slot 522 of the swivel groove 521. The depth of the swivel groove is equal to the height of the connecting protrusion 35, which ensures that when the pole post 3 and the connecting block 5 are rotated to their limit, the distance between the upper surface of the main board 33 and the lower surface of the connecting body 51 is greater than or equal to the minimum distance. See also... Figure 8 In the diagram, L represents the minimum distance, which is the sum of the heights of the first limiting protrusion 34 and the second limiting protrusion 52. The horizontal cross-sectional area of ​​the motherboard 33 is greater than that of the first limiting protrusion 34, and the first limiting protrusion 34 is located at the center of the motherboard 33. The horizontal cross-sectional area of ​​the connecting body 51 is greater than that of the second limiting protrusion 52, and the second limiting protrusion 52 is located at the center of the connecting body 51. Preferably, the motherboard 33, the first limiting protrusion 34, and the connecting protrusion 35 are integrally formed, and the connecting body 51 and the second limiting protrusion 52 are integrally formed.

[0077] The pole post 3 includes a main board 33, a first limiting protrusion 34, and a connecting protrusion 35. The first limiting protrusion 34 serves as a limiting element, and the connecting protrusion 35 serves as a connecting element. The connecting block 5 includes a connecting body 51 and a second limiting protrusion 52, which also serves as a limiting element.

[0078] In an optional embodiment of this utility model, the connecting body 51 is provided with a first anti-rotation structure, the upper surface of the upper plastic 4 is provided with a second anti-rotation structure, the lower surface is provided with a third anti-rotation structure, and the upper surface of the top cover 1 is provided with a fourth anti-rotation structure; the first anti-rotation structure cooperates with the second anti-rotation structure to prevent the connecting body 51 from rotating relative to the upper plastic 4; the third anti-rotation structure cooperates with the fourth anti-rotation structure to prevent the upper plastic 4 from rotating relative to the top cover 1.

[0079] Specifically, the reverse rotation of the connecting body 51 relative to the upper plastic 4 means that the connecting body 51 rotates in the opposite direction to the upper plastic 4 in the direction of being screwed and locked with the connecting block 5; similarly, the reverse rotation of the upper plastic 4 relative to the top cover 1 means that the upper plastic 4 rotates in the opposite direction to the top cover 1 in the direction of being screwed and locked with the connecting block 5.

[0080] The first, second, third, and fourth anti-rotation structures work together to prevent the connecting block 5 and the upper plastic 4 from rotating in reverse.

[0081] In the optional embodiments of this utility model, see Figure 4 , Figure 9 , Figure 10 , Figure 11 and Figure 13 The first anti-rotation structure is a first groove 511, located on the surface of the connecting body 51 where the second limiting protrusion 52 is located. The bottom wall of the first groove 511 is a first inclined surface. The second anti-rotation structure is a first protrusion 41, and the third anti-rotation structure is a second groove 42. The surface of the first protrusion 41 is a second inclined surface, and the bottom wall of the second groove 42 is a third inclined surface. The inclination direction of the second inclined surface is the same as the screwing direction of the connecting block 5. The first protrusion 41 is inserted into the first groove 511, and the second inclined surface is in contact with the first inclined surface. The fourth anti-rotation structure is a second protrusion 11, the surface of the second protrusion 11 is a fourth inclined surface, and the inclination direction of the fourth inclined surface is the same as the screwing direction of the connecting block 5. The second protrusion 11 is inserted into the second groove 42, and the fourth inclined surface is in contact with the third inclined surface.

[0082] Specifically, the vertical cross-section of the first protrusion 41 is set as a triangle; or, one side of the first protrusion 41 is flush with the upper surface of the upper plastic 4, and the other side is higher than the upper surface of the upper plastic 4, forming a right-angled triangle shape. See also Figure 7 and Figure 17 , Figure 7 The middle arrow indicates the locking direction of connecting block 5. Figure 17 The middle arrow indicates the direction of the apex of the triangle; the apex of the triangle is opposite to the rotational locking direction of the pole post 3 and the connecting block 5. When the connecting block 5 reverses, or when the pole post 3 and the connecting block 5 become loose and the distance increases, the right-angled surface of the first protrusion 41 prevents the connecting block 5 from reversing relative to the upper plastic 4. Similarly, the vertical cross-section of the second protrusion 11 is set as a triangle; or, one side of the second protrusion 11 is flush with the upper surface of the top cover plate 1, and the other side is higher than the upper surface of the top cover plate 1, forming a right-angled triangle shape. The apex of the triangle is opposite to the rotational locking direction of the pole post 3 and the connecting block 5. When the connecting block 5 reverses, or when the pole post 3 and the connecting block 5 become loose and the distance increases, the right-angled surface of the second protrusion 11 prevents the upper plastic 4 from reversing relative to the top cover plate 1. Of course, in this embodiment, in addition to the first anti-rotation structure, the second anti-rotation structure, the third anti-rotation structure and the fourth anti-rotation structure mentioned above, an anti-rotation structure is also provided between the lower plastic 2 and the main board 33 of the pole post 3 to prevent the pole post 3 from reversing; preferably, the lower plastic 2 is provided with a recess 21, and the main board 33 is snapped into the square recess 21.

[0083] The first protrusion 41 engages with the first groove 511, and the second protrusion 11 engages with the second groove 42, ensuring that the connecting block 5 can only rotate in one direction. This prevents the distance between the connecting block 5 and the terminal post 3 from increasing due to rotation, which would reduce the compression of the sealing ring 6 and affect the airtightness. Furthermore, existing technologies only have one anti-rotation structure for the terminal post 3. This secondary battery top cover assembly has multiple anti-rotation components, resulting in stronger anti-rotation capabilities compared to existing structures. It effectively prevents rotation of the entire terminal post 3, upper plastic 4, and lower plastic 2, avoiding rotation during top cover assembly, which could affect assembly positioning and prevent top cover processing failure. It also effectively prevents easily rotating top covers from being leaked to the battery production end, causing battery failure due to insecure top cover component fixation, resulting in sealing damage and battery leakage.

[0084] In an optional embodiment of this utility model, multiple first grooves 511, first protrusions 41, second grooves 42, and second protrusions 11 are provided. Multiple first grooves 511 are spaced apart along the circumferential direction of the connecting body 51. Multiple first protrusions 41, multiple second grooves 42, and multiple second protrusions 11 are all provided in one-to-one correspondence with multiple first grooves 511.

[0085] Specifically, a plurality of first grooves 511 are arranged in a circular pattern around the second limiting protrusion 52 along the connecting body 51.

[0086] Multiple first grooves 511, first protrusions 41, second grooves 42, and second protrusions 11 are provided to improve the anti-rotation effect.

[0087] In an optional embodiment of this utility model, both the horizontal cross-section of the connecting body 51 and the horizontal cross-section of the upper plastic 4 are set as regular hexagons.

[0088] Specifically, in this embodiment, the horizontal cross-section of the connecting body 51 and the horizontal cross-section of the upper plastic 4 are both set as regular hexagons. Of course, if the horizontal cross-section of the connecting body 51 and the horizontal cross-section of the upper plastic 4 are set as other shapes, such as quadrilaterals, irregular hexagons, or circles, they should also be within the protection scope of this utility model embodiment.

[0089] The connection block 5 is a hexagon or other polygon, which makes it easier to make a fixture to hold the connection block 5 and rotate it.

[0090] In an optional embodiment of this utility model, a sealing ring 6 is sandwiched between the lower plastic 2 and the pole post 3.

[0091] The sealing ring 6 serves to seal the seal.

[0092] In an optional embodiment of this utility model, the electrode post 3 includes a positive electrode post 31 and a negative electrode post 32, and two connecting blocks 5 are provided; the positive electrode post 31 and the negative electrode post 32 are spaced apart along the length direction of the top cover plate 1, and are respectively screwed to the two connecting blocks 5.

[0093] Specifically, the positive terminal 31 is made of aluminum, and the negative terminal 32 is made of copper. The connecting block 5 is made of aluminum.

[0094] The terminal 3 includes a positive terminal 31 and a negative terminal 32, and the positive terminal 31 and the negative terminal 32 are respectively connected to two connecting blocks 5 to realize the positive and negative terminal functions of the secondary battery top cover assembly.

[0095] The following explains the main differences between the secondary battery top cover assembly and existing technologies:

[0096] 1) Sealing method:

[0097] The existing technology is a riveting structure, which uses great force to rivet and deform the upper surface of the pole post 3, squeezing the post positioning piece and the sealing ring 6, so that the sealing ring 6 cannot spring back, thus ensuring airtightness.

[0098] The secondary battery top cover assembly uses a knob to fix the distance between the terminal post 3 and the connecting block 5. After tightening (the terminal post 3 and the connecting block 5 reach the minimum distance), the distance between the terminal post 3 and the connecting block 5 is fixed by the top cover plate 1, the upper plastic 4, and the anti-reverse structure of the connecting block 5 (first groove 511, first protrusion 41, second groove 42 and second protrusion 11).

[0099] 2) Anti-rotation method:

[0100] The existing technology only uses the lower surface of the plastic top cover 1 and the square shape of the electrode post 3 to prevent the electrode post 3 from rotating.

[0101] The secondary battery top cover assembly is based on the existing one, with the addition of a fourth anti-rotation structure on the upper surface of the top cover plate 1, and the limiting of the terminal post 3 and the connecting block 5 to ensure that the reverse rotation is guaranteed by the anti-rotation structure of the top cover plate 1, the upper plastic 4, and the connecting block 5.

[0102] 3) Pole post shape:

[0103] In existing technologies, the pole post 3 is generally circular.

[0104] The terminal post 3 of the secondary battery top cover assembly can be hexagonal or polygonal, or it can be circular.

[0105] The advantages of the secondary battery top cover assembly are explained in detail below:

[0106] 1) The riveting structure requires a large amount of energy during the workpiece processing, and the riveting will have a significant impact on the flatness of the upper surface of the pole post 3; the screw-lock 351 sealing structure will not affect the flatness of the upper surface of the pole post 3 or the connecting block 5, and can effectively reduce the damage to the insulating plastic caused by the strong riveting, reduce the battery insulation problems caused by the damage to the insulating plastic and the risk of leakage caused by the abnormal sealing of the top cover.

[0107] 2) The existing technology has only one anti-rotation structure for the terminal post 3. The secondary battery top cover assembly has multiple anti-rotation structures, including the first anti-rotation structure of the connecting block 5, the anti-rotation mechanism of the terminal post 3, the third anti-rotation structure of the top cover sheet 1, the second and third anti-rotation structures of the upper plastic 4, and the anti-rotation structure of the lower plastic 2. Compared with the existing structure, it has a stronger anti-rotation capability and can effectively prevent the rotation of the entire terminal post 3, the upper plastic 4, and the lower plastic 2, avoiding rotation during the assembly of the top cover, affecting the assembly positioning, and preventing the top cover from being scrapped. At the same time, it can also effectively prevent the easily rotated top cover from being leaked to the battery production end, causing the battery to fail due to the sealing damage caused by the loose fixing of the top cover components, such as battery leakage.

[0108] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0109] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A secondary battery top cover assembly, characterized in that, include: Top cover (1), lower plastic (2), pole post (3), upper plastic (4) and connecting block (5); The lower plastic (2), the top cover (1), and the upper plastic (4) are stacked in sequence; One end of the pole (3) passes through the lower plastic (2), the top cover (1) and the upper plastic (4) in sequence, and is screwed to the connecting block (5).

2. The secondary battery top cover assembly according to claim 1, characterized in that, The pole post (3) includes a first limiting protrusion (34) and a connecting protrusion (35), wherein the connecting protrusion (35) is connected to the first limiting protrusion (34); The connecting block (5) is provided with a screw-in groove (521), and the connecting protrusion (35) extends into the screw-in groove (521) and screws into the screw-in groove (521).

3. The secondary battery top cover assembly according to claim 2, characterized in that, The outer wall of the connecting protrusion (35) is provided with a buckle (351), and the side wall of the screw-in groove (521) is provided with a slot (522). The buckle (351) and the slot (522) cooperate with each other.

4. The secondary battery top cover assembly according to claim 2, characterized in that, The depth of the screw groove (521) is equal to the height of the connecting protrusion (35).

5. The secondary battery top cover assembly according to claim 2, characterized in that, The pole post (3) also includes a main board (33), and the two ends of the first limiting protrusion (34) are respectively connected to the main board (33) and the connecting protrusion (35); The connecting block (5) includes a connecting body (51) and a second limiting protrusion (52). One end of the second limiting protrusion (52) is connected to the connecting body (51), and the other end is provided with the screw-in groove (521).

6. The secondary battery top cover assembly according to claim 5, characterized in that, The connecting body (51) is provided with a first anti-rotation structure, the upper surface of the upper plastic (4) is provided with a second anti-rotation structure, the lower surface is provided with a third anti-rotation structure, and the upper surface of the top cover (1) is provided with a fourth anti-rotation structure. The first anti-rotation structure cooperates with the second anti-rotation structure to prevent the connecting body (51) from rotating relative to the upper plastic (4); The third anti-rotation structure cooperates with the fourth anti-rotation structure to prevent the upper plastic (4) from rotating relative to the top cover (1).

7. The secondary battery top cover assembly according to claim 6, characterized in that, The first anti-rotation structure is configured as a first groove (511) and is provided on the surface of the connecting body (51) where the second limiting protrusion (52) is provided. The bottom wall of the first groove (511) is configured as a first inclined surface. The second anti-rotation structure is configured as a first protrusion (41), and the third anti-rotation structure is configured as a second groove (42). The surface of the first protrusion (41) is configured as a second inclined surface, and the bottom wall of the second groove (42) is configured as a third inclined surface. The inclination direction of the second inclined surface is the same as the screwing direction of the connecting block (5). The first protrusion (41) is inserted into the first groove (511), and the second inclined surface is in contact with the first inclined surface. The fourth anti-rotation structure is configured as a second protrusion (11), the surface of the second protrusion (11) is configured as a fourth inclined surface, the inclination direction of the fourth inclined surface is the same as the screwing direction of the connecting block (5), the second protrusion (11) is inserted into the second groove (42), and the fourth inclined surface is in contact with the third inclined surface.

8. The secondary battery top cover assembly according to claim 7, characterized in that, The first groove (511), the first protrusion (41), the second groove (42) and the second protrusion (11) are all provided in multiples, and the multiple first grooves (511) are arranged at intervals along the circumference of the connecting body (51); The plurality of first protrusions (41), the plurality of second grooves (42) and the plurality of second protrusions (11) are all configured in a one-to-one correspondence with the plurality of first grooves (511).

9. The secondary battery top cover assembly according to claim 5, characterized in that, The horizontal cross-section of the connecting body (51) and the horizontal cross-section of the upper plastic (4) are both set as regular hexagons.

10. The secondary battery top cover assembly according to any one of claims 1-9, characterized in that, The pole (3) includes a positive pole (31) and a negative pole (32), and the connecting block (5) is provided in two parts; The positive terminal (31) and the negative terminal (32) are spaced apart along the length of the top cover plate (1) and are respectively screwed to the two connecting blocks (5).

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