A new energy battery cover plate

Abstract

This utility model discloses a new energy battery cover plate, including a cover plate body, a lower plastic insulating bracket, a positive terminal, a negative terminal, a sealing element, a metal pressure ring, a plastic fixing element, and a conductive sheet or insulating sheet. The plastic fixing element is sleeved inside the cover plate body for fixing the positive and negative terminals. The metal pressure ring is embedded in the outer wall of the plastic fixing element, and the conductive sheet or insulating sheet is embedded in the inner wall of the plastic fixing element. The upper side of the conductive sheet or insulating sheet is in contact with the inner side of the metal pressure ring, and the inner side is in contact with the outer side of the positive and negative terminals. The sealing element is used to seal between the positive and negative terminals and the cover plate body. This utility model simplifies the assembly process of the new energy battery cover plate by embedding a metal pressure ring in the outer wall of the plastic fixing element and embedding a conductive sheet or insulating sheet in the inner wall, while ensuring structural reliability. It reduces the assembly difficulty, reduces the amount of key materials used, helps to improve the assembly efficiency of the cover plate and reduce costs, and improves the energy density and safety performance of the new energy battery.

Description

Technical Field

[0001] This utility model relates to the field of new energy battery technology, and in particular to a new energy battery cover plate. Background Technology

[0002] In recent years, driven by the concept of "green and sustainable development," the new energy vehicle market has continued to expand rapidly, leading to a surge in the new energy battery market. Currently, new energy batteries generally adopt a square aluminum shell structure, consisting of a shell and a battery cover. The battery cover provides a sealed space for the battery and also serves as the energy transfer medium; its structure directly affects the reliability and manufacturing cost of the battery pack. Based on these issues, it is necessary to design a reliable, simple, and low-cost new energy battery cover to improve the energy density of new energy batteries and reduce manufacturing costs.

[0003] Currently, the traditional cover structure commonly used in new energy batteries weighs up to 90g and has a total height of 19mm. This results in low material utilization efficiency and high material costs. The thick and bulky structure reduces the space utilization of the new energy battery, thus lowering its energy density. Currently, over 90% of traditional cover structures on the market require the positive terminal to be conductive to the cover body. This necessitates the use of modified plastic materials with conductive properties for the plastic fasteners used to fix the positive terminal, which are 1.75 times more expensive than ordinary plastic materials. The plastic fastener structure needs to provide both fixing of the positive and negative terminals and ensure conductivity between the positive terminal and the cover body, making the structure complex, the injection mold and process intricate, and the injection molding cost high. Traditional cover structures use copper-aluminum friction welding technology for the positive and negative terminals, relying on PPS material for in-mold injection molding to fix the cover and positive and negative terminals. This carries the risk of breakage at the copper-aluminum joint surface of the positive and negative terminals and the risk of the positive and negative terminals detaching from the cover, reducing the safety of the new energy battery during use. Utility Model Content

[0004] To address the issues of traditional new energy battery cover structures being thick and bulky, and the plastic fasteners needing to simultaneously fix both positive and negative terminals and ensure electrical conductivity between the positive terminal and the cover body, resulting in complex structures, large material usage, complex injection molding processes, high costs, reduced space utilization, and lower energy density of new energy batteries, this invention provides a new energy battery cover that simplifies the assembly process by embedding a metal pressure ring in the outer wall of the plastic fastener and a conductive or insulating sheet in the inner wall. This ensures structural reliability while reducing assembly difficulty, decreasing the amount of key materials used, improving assembly efficiency, reducing production costs, and enhancing the energy density and safety performance of new energy batteries.

[0005] To achieve the above objectives, this utility model provides a new energy battery cover plate, including a cover plate body, a lower plastic insulating bracket, a positive terminal, and a negative terminal. The lower plastic insulating bracket is fixedly connected to the bottom surface of the cover plate body. The negative terminal and the positive terminal are respectively inserted into the left and right ends of the cover plate body and the lower plastic insulating bracket. The feature is that it also includes a sealing element, a metal pressure ring, a plastic fixing element, and an insulating sheet or a conductive sheet. Two sets of the sealing element, the metal pressure ring, the plastic fixing element, and the conductive sheet or the insulating sheet are provided, respectively located at the corresponding positions of the positive terminal and the negative terminal.

[0006] The cover plate body is provided with a first through hole at the corresponding position of the positive terminal and the negative terminal, a first countersunk hole is provided above the first through hole, and a second countersunk hole is provided above the first countersunk hole;

[0007] The lower plastic insulating bracket is provided with a second through hole at a position corresponding to the first through hole, and a third countersunk hole is provided above the second through hole, and a countersunk groove is provided above the third countersunk hole;

[0008] The plastic fastener is fitted into the second countersunk hole to fix the positive or negative terminal and to separate the positive or negative terminal from the cover plate body. The lower outer wall of the plastic fastener is provided with an S-shaped annular groove.

[0009] The metal pressure ring includes an upper inner flange and a lower outer flange, forming an S-shaped ring structure, which is embedded in the S-shaped ring groove. The outer side of the lower outer flange is welded and fixedly connected to the inner side of the second countersunk hole. The metal pressure ring is provided with undercut notches at all four corners. The plastic fastener is provided with corresponding interlocking connecting parts at the corresponding positions of the undercut notches to prevent the plastic fastener from falling off.

[0010] The conductive or insulating sheet is embedded in the inner wall of the plastic fastener, and the upper end face of the conductive or insulating sheet is in contact with the inner top surface of the metal pressure ring. When the positive terminal of the new energy battery needs to be electrically connected to the cover plate body, the conductive sheet is embedded in the inner wall of the positive terminal plastic fastener, and the positive terminal is electrically connected to the cover plate body through the conductive sheet and the metal pressure ring. When the positive terminal of the new energy battery does not need to be electrically connected to the cover plate body, the insulating sheet is embedded in the inner wall of the positive terminal plastic fastener. The insulating sheet is also embedded in the inner wall of the negative terminal plastic fastener.

[0011] The positive and negative terminals have the same structure. The upper end is fixedly sleeved in a plastic fastener, conductive sheet or insulating sheet. The inner side of the conductive sheet or insulating sheet is in contact with the outer side of the upper end of the positive or negative terminal. The lower end is sleeved in the first through hole, the second through hole and the second countersunk hole.

[0012] The sealing element is fitted into the gap between the plastic fixing element, the cover plate body, the lower plastic insulating bracket and the positive or negative terminal, and is used to seal between the positive or negative terminal and the cover plate body.

[0013] The conductive sheet or insulating sheet is injection molded separately, and the plastic fastener, positive or negative terminal, cover plate body, conductive sheet or insulating sheet, and sealing component are integrally injection molded and assembled. The plastic fastener and insulating sheet are made of non-conductive plastic material, and the conductive sheet is made of modified plastic material with conductive properties.

[0014] Due to the different applications of new energy batteries, in some cases, the positive terminal of the new energy battery needs to be electrically connected to the cover plate body. The traditional method is to use a modified plastic material with conductive function for the plastic fastener and to integrally injection mold it with the cover plate body. Therefore, the plastic fastener must not only fix the positive terminal but also have a conductive function, which makes the structure complex. Moreover, the modified plastic material is 1.75 times more expensive than ordinary plastic material with insulating function, which greatly increases the injection molding cost. This invention achieves electrical conductivity between the positive terminal and the cover plate by embedding a metal pressure plate on the outer wall and a conductive sheet on the inner wall of the plastic fixing component at the positive terminal, ensuring that the conductive sheet is in close contact with both the metal pressure plate and the positive terminal. The conductive sheet is made of modified plastic material and is injection molded separately. The conductive sheet has a simple structure, uses less material, and requires simple injection molds and injection molding processes. Since the plastic fixing component is only used to fix the positive terminal and has no conductivity requirements, the structure is simplified, and ordinary insulating plastic material can be used. This simplifies the integrated injection molding assembly process of the plastic fixing component and the cover plate, improves injection molding assembly efficiency, and greatly reduces injection molding costs.

[0015] As a further improvement to this technology, the plastic fastener is provided with a third through hole, a first annular groove, a second annular groove and a layer hole in sequence from top to bottom. The inner diameter of the first annular groove is larger than the inner diameter of the third through hole, and the inner diameters of the first annular groove, the second annular groove and the layer hole decrease in sequence. The inner diameter of the layer hole is larger than the inner diameter of the third through hole.

[0016] As a further improvement of this technology, the conductive sheet or insulating sheet is fitted into the first annular groove, with a fourth through hole in the middle and a fourth countersunk hole at the lower end of the fourth through hole. The inner diameter of the fourth through hole is the same as the inner diameter of the third through hole, and the inner sidewall of the fourth through hole is in contact with the outer side of the upper end of the positive or negative terminal. The upper side of the conductive sheet or insulating sheet is in contact with the lower bottom surface of the upper inner flange of the metal pressure ring.

[0017] As a further improvement to this technology, a first notch is provided in the middle of the upper side of the four periphery of the conductive sheet or insulating sheet, and a second notch is provided in the middle of the outer side of the four periphery. The first notch and the second notch have the same length. The plastic fastener is provided with a matching embedded connector at the corresponding position of the first notch and the second notch, thereby improving the connection strength between the plastic fastener and the conductive sheet or insulating sheet.

[0018] As a further improvement to this technology, the positive and negative terminals have the same structure, each including a first upper boss, a second upper boss, a middle flange, and a lower boss connected sequentially from top to bottom. The second upper boss is fitted into the third and fourth through holes, the first upper boss extends out of the upper end face of the plastic fixing part, the middle flange is engaged in the fourth countersunk hole and the second annular groove, and the lower boss is fitted into the first through hole, the second through hole, and the layer hole.

[0019] As a further improvement of this technology, the sealing element is provided with a fifth through hole in the middle and an outwardly extending flange at the upper end of the outer side. The sealing element is fitted into the first through hole, the first countersunk hole, the third countersunk hole, and the layer hole. The upper end face of the flange is in contact with the lower end face of the middle flange, the outer side is in contact with the inner side of the layer hole, the lower end face of the flange is in contact with the bottom surface of the first countersunk hole, and the lower end face of the sealing element is in contact with the bottom surface of the third countersunk hole, thereby sealing the positive or negative terminal to the cover plate body.

[0020] As a further improvement to this technology, the positive terminal is made of aluminum sheet by stamping, the negative terminal is made of copper-aluminum composite sheet by stamping, the height of the positive terminal and the negative terminal is set to h≤6.5mm, and the total height of the new energy battery cover is set to 6~13mm.

[0021] The positive terminal of this invention is made of aluminum sheet by stamping, which saves the cost of traditional positive terminal metal processing. The negative terminal is made of copper-aluminum composite sheet by direct stamping, which saves the cost of traditional negative terminal friction welding process, as well as the cost of metal processing.

[0022] Compared with the prior art, the beneficial effects of this utility model are as follows: by embedding a metal pressure ring in the outer wall of the plastic fastener and embedding a conductive sheet or insulating sheet in the inner wall, the assembly process of the new energy battery cover is simplified, the assembly process difficulty is reduced, the amount of key materials used is reduced, and the assembly efficiency of the top cover is improved and the production cost is reduced, thereby improving the energy density and safety performance of the new energy battery.

[0023] 1. This utility model has strong structural reliability, simple manufacturing process and low cost, which greatly reduces the height of the new energy battery cover from the traditional 19mm to 6-13mm, reduces the weight of the new energy battery cover, improves the energy density of the new energy battery and reduces material costs.

[0024] 2. This utility model innovatively adopts a conductive sheet or insulating sheet assembly method to achieve conductivity or insulation between the positive terminal and the cover plate body, which reduces the material conductivity requirements of the plastic fastener, thereby simplifying the structure of the plastic fastener, simplifying its injection mold and injection process, and greatly reducing the cost of injection assembly process.

[0025] 3. The negative terminal of this utility model is formed by stamping copper-aluminum composite plate, and the positive terminal is formed by stamping aluminum plate. This simplifies the process, improves product consistency, and increases the yield rate. The height of the positive and negative terminals is reduced from the traditional 10.3mm to ≤6.5mm. It also saves the cost of friction welding between copper and aluminum materials for the negative terminal and the cost of machining the positive and negative terminals. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0027] Figure 2 This is a schematic diagram of the exploded structure of an embodiment of the present utility model;

[0028] Figure 3 This is a cross-sectional structural diagram of an embodiment of the present utility model;

[0029] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0030] Figure 5 This is a cross-sectional view of the plastic fastener according to an embodiment of the present invention;

[0031] Figure 6 This is a schematic diagram of the metal pressure ring structure of an embodiment of the present invention;

[0032] Figure 7 This is a schematic diagram of the conductive sheet or insulating sheet structure of an embodiment of this utility model;

[0033] Figure 8 This is a cross-sectional view along the diagonal of the assembled plastic fastener, metal pressure plate, and conductive or insulating sheet according to an embodiment of the present utility model.

[0034] Figure 9 This is a schematic diagram of the negative end substructure of an embodiment of the present invention;

[0035] Figure 10 This is a schematic diagram of the sealing component structure in an embodiment of the present invention.

[0036] In the diagram: 1. Cover plate body; 11. First through hole; 12. First countersunk hole; 13. Second countersunk hole; 2. Lower plastic insulating bracket; 21. Second through hole; 22. Third countersunk hole; 23. Countersunk groove; 3. Sealing element; 4. Plastic fixing element; 41. Third through hole; 42. First annular groove; 43. Second annular groove; 44. Layer hole; 45. S-shaped annular groove; 46. Embedded connector; 5. Metal pressure ring; 51. Upper inner flange; 52. Lower outer flange; 53. Undercut notch; 6. Negative terminal; 61. First upper boss; 62. Second upper boss; 63. Middle flange; 64. Lower boss; 7a. Conductive sheet; 7b. Insulating sheet; 71. Fourth through hole; 72. Fourth countersunk hole; 73. First notch; 74. Second notch; 8. Positive terminal. Detailed Implementation

[0037] 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0038] like Figures 1-10 As shown, this utility model embodiment is used for a new energy battery cover plate where the cover plate body 1 and the positive terminal 8 need to be electrically connected. It includes a cover plate body 1, a lower plastic insulating bracket 2, a positive terminal 8, a negative terminal 6, a sealing element 3, a metal pressure ring 5, a plastic fixing element 4, a conductive sheet 7a, and an insulating sheet 7b. The lower plastic insulating bracket 2 is fixedly connected to the bottom surface of the cover plate body 1. The negative terminal 6 and the positive terminal 8 are respectively inserted into the left and right ends of the cover plate body 1 and the lower plastic insulating bracket 2. There are two sets of sealing elements 3, metal pressure ring 5, and plastic fixing element 4, which are respectively located at the corresponding positions of the positive terminal 8 and the negative terminal 6. The conductive sheet 7a is located at the corresponding position of the positive terminal, and the insulating sheet 7b is located at the corresponding position of the negative terminal.

[0039] The cover plate body 1 has a first through hole 11 at the corresponding positions of the positive terminal 8 and the negative terminal 6. A first countersunk hole 12 is provided above the first through hole 11, and a second countersunk hole 13 is provided above the first countersunk hole 12.

[0040] The lower plastic insulating bracket 2 is provided with a second through hole 21 at the position corresponding to the first through hole 11. A third countersunk hole 22 is provided above the second through hole 21, and a countersunk groove 23 is provided above the third countersunk hole 22.

[0041] The plastic fastener 4 is fitted into the second countersunk hole 13 to fix the positive terminal 6 or the negative terminal 8 and to separate the positive terminal 6 or the negative terminal 8 from the cover plate body 1. The lower outer wall of the plastic fastener 4 is provided with an S-shaped annular groove 45.

[0042] The metal pressure ring 5 includes an upper inner flange 51 and a lower outer flange 52, forming an S-shaped annular structure, which is embedded in the S-shaped annular groove 45. The outer side of the lower outer flange 52 is welded and fixedly connected to the inner side of the second countersunk hole 13. The metal pressure ring 5 has undercut notches 53 at all four corners. The plastic fastener 4 has corresponding connecting parts at the positions corresponding to the undercut notches 53 (see...). Figure 8 (As shown), to prevent the plastic fastener 4 from falling off;

[0043] The conductive sheet 7a is embedded in the inner wall of the positive end plastic fixing part 4, and the upper end surface of the conductive sheet 7a is in contact with the inner top surface of the corresponding metal pressure ring 5; the insulating sheet 7b is embedded in the inner wall of the negative end plastic fixing part 4, and the upper end surface of the insulating sheet 7b is in contact with the inner top surface of the corresponding metal pressure ring 5.

[0044] The upper end of the positive terminal 8 is fixedly sleeved in the corresponding plastic fastener 4 and conductive sheet 7a. The inner side of the conductive sheet 7a is in contact with the outer side of the upper end of the positive terminal 8, so that the cover plate body 1 can be connected to the positive terminal 8. The lower end is sleeved in the first through hole 11, the second through hole 21, and the second countersunk hole 13.

[0045] The negative terminal 6 and the positive terminal have the same structure. The upper end is fixedly sleeved in the corresponding plastic fastener 4 and insulating sheet 7b. The inner side of the insulating sheet 7b is in contact with the outer side of the upper end of the negative terminal 6. The lower end is sleeved in the first through hole 11, the second through hole 21, and the second countersunk hole 13.

[0046] The sealing element 3 is fitted into the gap between the plastic fixing element 4, the cover plate body 1, the lower plastic insulating bracket 2 and the positive terminal 8 or the negative terminal 6, and is used to seal between the positive terminal 8 or the negative terminal 6 and the cover plate body 1.

[0047] The conductive sheet 7a or the insulating sheet 7b is injection molded separately. The plastic fastener 4, the positive terminal 8 or the negative terminal 6, the cover plate body 1, the conductive sheet 7a or the insulating sheet 7b, and the sealing component 3 are integrally injection molded and assembled. The plastic fastener 4 and the insulating sheet 7b are made of non-conductive plastic materials, while the conductive sheet 7a is made of modified plastic material with conductive properties.

[0048] Due to the different applications of new energy batteries, in some cases, the positive terminal 8 needs to be electrically connected to the cover plate body 1. The traditional method is to use a modified plastic material with conductive function for the plastic fastener 4 and integrally injection mold it with the cover plate body 1. Therefore, the plastic fastener 4 must not only fix the positive terminal 8, but also have a conductive function, which makes the structure complex. Moreover, the modified plastic material is 1.75 times more expensive than ordinary plastic material with insulating function, which greatly increases the injection molding cost. This invention achieves electrical conductivity between the positive terminal 8 and the cover plate body 1 by embedding a metal pressure plate 5 into the outer wall of the plastic fixing component 4 at the positive terminal and a conductive sheet 7a into the inner wall, ensuring that the conductive sheet 7a is in close contact with both the metal pressure plate 5 and the positive terminal 8. The metal pressure plate 5 is welded and fixedly connected to the cover plate body 1. The conductive sheet 7a is made of modified plastic material and is injection molded separately. The conductive sheet 7a has a simple structure, uses less material, and requires simple injection molds and injection molding processes. Since the plastic fixing component 4 is only used to fix the positive terminal 8, it no longer has conductivity requirements, simplifying the structure. Furthermore, it can use ordinary insulating plastic material, thereby simplifying the integrated injection molding assembly process of the plastic fixing component 4 and the cover plate body 1, improving injection molding assembly efficiency, and greatly reducing injection molding process costs.

[0049] As a preferred option, such as Figure 5 As shown, the plastic fastener 4 is provided with a third through hole 41, a first annular groove 42, a second annular groove 43 and a layer hole 44 in sequence from top to bottom. The inner diameter of the first annular groove 42 is larger than the inner diameter of the third through hole 41. The inner diameters of the first annular groove 42, the second annular groove 43 and the layer hole 44 decrease in sequence. The inner diameter of the layer hole 44 is larger than the inner diameter of the third through hole 41.

[0050] As a preferred option, such as Figure 4 , Figure 7 , Figure 8 As shown, the conductive sheet 7a and the insulating sheet 7b are respectively fitted into the corresponding first annular grooves 42 on the left and right sides. A fourth through hole 71 is provided in the middle, and a fourth countersunk hole 72 is provided at the lower end of the fourth through hole 71. The inner diameter of the fourth through hole 71 is the same as the inner diameter of the third through hole 41. The inner sidewall of the fourth through hole 71 is in contact with the upper outer side of the positive terminal 8 or the negative terminal 6. The upper side of the conductive sheet 7a or the insulating sheet 7b is in contact with the lower bottom surface of the upper inner flange 51 of the metal pressure ring 5. The conductive sheet 7a is used to make the positive terminal 8 conduct to the cover plate body 1, and the insulating sheet 7b is used to insulate the negative terminal 6 from the cover plate body 1.

[0051] Preferably, the conductive sheet 7a or the insulating sheet 7b has a first notch 73 in the middle of the upper side of each of its four periphery and a second notch 74 in the middle of the outer side of each of its four periphery. The first notch 73 and the second notch 74 have the same length. The first annular groove 42 has a corresponding embedded connector 46 at the position corresponding to the first notch 73 and the second notch 74, which improves the connection strength between the plastic fixing part 4 and the conductive sheet 7a or the insulating sheet 7b.

[0052] As a preferred option, such as Figure 9 , Figure 4 As shown, the negative terminal 6 includes a first upper boss 61, a second upper boss 62, a middle flange 63, and a lower boss 64 connected sequentially from top to bottom. The second upper boss 62 is fitted into the third through hole 41 and the fourth through hole 71. The first upper boss 61 extends out of the upper end face of the plastic fixing part 4. The middle flange 63 is engaged in the fourth countersunk hole 72 and the second annular groove 43. The lower boss 64 is fitted into the first through hole 11, the second through hole 21, and the layer hole 44. The positive terminal 8 has the same external structure as the negative terminal 6.

[0053] As a preferred option, such as Figure 10 , Figure 4 As shown, the sealing element 3 has a fifth through hole 31 in the middle and an outwardly extending flange 32 at the upper end of its outer side. The sealing element 3 is fitted into the first through hole 11, the first countersunk hole 12, the third countersunk hole 22, and the layer hole 44. The upper end face of the flange 32 is in contact with the lower end face of the middle flange 63, the outer side is in contact with the inner side of the layer hole 44, the lower end face of the flange 32 is in contact with the bottom surface of the first countersunk hole 12, and the lower end face of the sealing element 3 is in contact with the bottom surface of the third countersunk hole 22, thus sealing the positive terminal 8 or the negative terminal 6 with the cover plate body 1.

[0054] As a preferred embodiment, the positive terminal 8 is made of aluminum sheet by stamping, and the negative terminal 6 is made of copper-aluminum composite sheet by stamping. The height of the positive terminal 8 and the negative terminal 6 is 6.5mm, and the total height of the new energy battery cover is 8.5mm.

[0055] The positive terminal 8 of this utility model is formed by stamping aluminum sheet, which saves the cost of traditional metal processing of the positive terminal 8. The negative terminal 6 is formed by direct stamping of copper-aluminum composite plate, which saves the cost of traditional friction welding of the negative terminal 6, as well as the cost of metal processing.

[0056] In this embodiment, the material cost of the plastic fastener 4 + metal pressure plate 5 + conductive plate 7a is 0.1 yuan; while the material cost of the traditional plastic fastener is 0.18 yuan. In this embodiment, the material cost of the positive terminal 8 and negative terminal 6 plus the stamping cost is 1.5 + 0.3 = 1.8 yuan; while the material cost of the traditional positive terminal and negative terminal plus the friction welding cost plus the metal processing cost is 3.0 + 0.45 + 1.2 = 4.65 yuan.

[0057] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of this utility model, and these improvements and substitutions should also be considered within the protection scope of this utility model.

Claims

1. A cover plate for a new energy battery, comprising a cover plate body, a lower plastic insulating bracket, a positive terminal, and a negative terminal, wherein the lower plastic insulating bracket is fixedly connected to the bottom surface of the cover plate body, and the negative terminal and the positive terminal are respectively inserted into the left and right ends of the cover plate body and the lower plastic insulating bracket, characterized in that: It also includes seals, metal pressure rings, plastic fasteners, and insulating or conductive sheets. Two sets of seals, metal pressure rings, plastic fasteners, and conductive or insulating sheets are provided, respectively located at the corresponding positions of the positive and negative terminals. The cover plate body is provided with a first through hole at the corresponding position of the positive terminal and the negative terminal, a first countersunk hole is provided above the first through hole, and a second countersunk hole is provided above the first countersunk hole; The lower plastic insulating bracket is provided with a second through hole at a position corresponding to the first through hole, and a third countersunk hole is provided above the second through hole, and a countersunk groove is provided above the third countersunk hole; The plastic fastener is fitted into the second countersunk hole to fix the positive or negative terminal and to separate the positive or negative terminal from the cover plate body. The lower outer wall of the plastic fastener is provided with an S-shaped annular groove. The metal pressure ring includes an upper inner flange and a lower outer flange, forming an S-shaped ring structure, which is embedded in the S-shaped ring groove. The outer side of the lower outer flange is welded and fixedly connected to the inner side of the second countersunk hole. The metal pressure ring is provided with undercut notches at all four corners. The plastic fastener is provided with corresponding interlocking connecting parts at the corresponding positions of the undercut notches to prevent the plastic fastener from falling off. The conductive or insulating sheet is embedded in the inner wall of the plastic fastener, and the upper end face of the conductive or insulating sheet is in contact with the inner top surface of the metal pressure ring. When the positive terminal of the new energy battery needs to be connected to the cover plate body, the conductive sheet is embedded in the inner wall of the positive terminal plastic fastener, and the positive terminal is connected to the cover plate body through the conductive sheet and the metal pressure ring. When the positive terminal of the new energy battery does not need to be connected to the cover plate body, the insulating sheet is embedded in the inner wall of the positive terminal plastic fastener. The insulating sheet is also embedded in the inner wall of the negative terminal plastic fastener. The positive and negative terminals have the same structure. The upper end is fixedly sleeved in a plastic fastener, conductive sheet or insulating sheet. The inner side of the conductive sheet or insulating sheet is in contact with the outer side of the upper end of the positive or negative terminal. The lower end is sleeved in the first through hole, the second through hole and the second countersunk hole. The sealing element is fitted into the gap between the plastic fixing element, the cover plate body, the lower plastic insulating bracket and the positive or negative terminal, and is used to seal between the positive or negative terminal and the cover plate body. The conductive sheet or insulating sheet is injection molded separately, and the plastic fastener, positive or negative terminal, cover plate body, conductive sheet or insulating sheet, and sealing component are integrally injection molded and assembled. The plastic fastener and insulating sheet are made of non-conductive plastic material, and the conductive sheet is made of modified plastic material with conductive properties.

2. The new energy battery cover plate according to claim 1, characterized in that: The plastic fastener is provided with a third through hole, a first annular groove, a second annular groove and a layer hole in sequence from top to bottom. The inner diameter of the first annular groove is larger than the inner diameter of the third through hole. The inner diameters of the first annular groove, the second annular groove and the layer hole decrease in sequence. The inner diameter of the layer hole is larger than the inner diameter of the third through hole.

3. The new energy battery cover plate according to claim 2, characterized in that: The conductive sheet or insulating sheet is fitted into the first annular groove, with a fourth through hole in the middle and a fourth countersunk hole at the lower end of the fourth through hole. The inner diameter of the fourth through hole is the same as the inner diameter of the third through hole. The inner sidewall of the fourth through hole is in contact with the outer side of the upper end of the positive or negative terminal. The upper side of the conductive sheet or insulating sheet is in contact with the lower bottom surface of the upper inner flange of the metal pressure ring.

4. The new energy battery cover plate according to claim 1, characterized in that: The conductive sheet or insulating sheet has a first notch in the middle of the upper side of each of its four perimeters and a second notch in the middle of the outer side of each of its four perimeters. The first and second notches are of the same length. The plastic fastener has a matching embedded connector at the corresponding position of the first and second notches to improve the connection strength between the plastic fastener and the conductive sheet or insulating sheet.

5. The new energy battery cover plate according to claim 3, characterized in that: The positive and negative terminals have the same structure, each including a first upper boss, a second upper boss, a middle flange, and a lower boss connected sequentially from top to bottom. The second upper boss is fitted into the third and fourth through holes, the first upper boss extends out of the upper end face of the plastic fixing part, the middle flange is engaged in the fourth countersunk hole and the second annular groove, and the lower boss is fitted into the first through hole, the second through hole, and the layer hole.

6. The new energy battery cover plate according to claim 5, characterized in that: The sealing element has a fifth through hole in the middle and an outwardly extending flange at the upper end of its outer side. The sealing element is fitted into the first through hole, the first countersunk hole, the third countersunk hole, and the layer hole. The upper end face of the flange is in contact with the lower end face of the middle flange, the outer side is in contact with the inner side of the layer hole, the lower end face of the flange is in contact with the bottom surface of the first countersunk hole, and the lower end face of the sealing element is in contact with the bottom surface of the third countersunk hole, thus sealing the positive or negative terminal to the cover plate body.

7. The new energy battery cover plate according to claim 1, characterized in that: The positive terminal is made of aluminum sheet by stamping, and the negative terminal is made of copper-aluminum composite sheet by stamping. The height of the positive terminal and the negative terminal is set to h≤6.5mm, and the total height of the new energy battery cover is set to 6~13mm.

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