New energy battery cover plate

Abstract

The utility model discloses a new energy battery cover plate which comprises a top cover piece, an anti-explosion valve and an anti-explosion valve protection cover, a first kidney-shaped through hole is formed in the middle of the top cover piece, a coaxial kidney-shaped layer hole is formed above the first kidney-shaped through hole, a coaxial annular kidney-shaped groove is formed in the periphery of the first kidney-shaped through hole, the anti-explosion valve is arranged in the kidney-shaped layer hole in a sleeved mode, and the anti-explosion valve protection cover is arranged in the anti-explosion valve. The outer periphery of the anti-explosion valve is connected with the upper end of the top cover piece through a first laser welding seam, the first laser welding seam is arranged on the front face of the top cover piece, a second kidney-shaped through hole is formed in the middle of the upper side wall of the anti-explosion valve protection cover, and a flange extending outwards is arranged on the outer periphery of the lower end of the anti-explosion valve protection cover and arranged in the annular kidney-shaped groove in a sleeved mode. The outer periphery of the flange is connected with the upper end of the top cover piece through a second laser welding seam, and the second laser welding seam is arranged on the front face of the top cover piece. The explosion-proof valve is arranged in the waist-shaped layer hole of the top cover plate, and the first laser welding seam between the periphery of the explosion-proof valve and the top cover plate is arranged on the front surface of the top cover plate, so that the welding seam can be effectively prevented from being corroded by liquid electrolyte, the safety of the new energy battery is improved, and the service life of the new energy battery is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy batteries, in particular to a new energy battery cover. Background Art

[0002] In recent years, driven by the concept of "green and sustainable development," the new energy vehicle market has continued to expand rapidly, driving the rapid growth of the new energy battery market. Currently, new energy batteries generally use a square aluminum shell structure, consisting of a shell and a battery cover. The battery cover not only provides a sealed space for the new energy battery, but also serves as the energy transmission medium for the new energy battery. Its structure directly affects the reliability and manufacturing cost of the battery pack. In view of these issues, it is necessary to design a new energy battery cover with a reliable structure, simple manufacturing process, and low cost to improve the energy density of new energy batteries and reduce manufacturing costs.

[0003] At present, new energy batteries generally use traditional cover structures. The welds of the explosion-proof valves are on the back of the cover. Liquid electrolytes can easily corrode the welds, reducing the safety and service life of new energy batteries during use. Utility Model Content

[0004] In order to solve the problems existing in the existing new energy battery cover in the above-mentioned background technology, the utility model provides a new energy battery cover with a simple and reliable structure. The explosion-proof valve is arranged in the waist-shaped layer hole of the top cover piece, and the explosion-proof valve fixing part is connected to the upper end of the top cover piece by a first laser weld. An explosion-proof valve protective cover is arranged on the outside of the explosion-proof valve, and the explosion-proof valve protective cover is connected to the upper end of the top cover piece by a second laser weld. The first and second laser welds are both arranged on the front of the top cover piece, which can effectively prevent liquid electrolyte from corroding the welds, thereby improving the safety and service life of the new energy battery.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a new energy battery cover, including a top cover sheet and an explosion-proof valve, the explosion-proof valve is waist-shaped and is arranged in the middle of the top cover sheet, and is characterized in that: it also includes an explosion-proof valve protective cover, a first waist-shaped through hole is provided in the middle of the top cover sheet, a coaxial waist-shaped layer hole is provided above the first waist-shaped through hole, an annular waist-shaped groove coaxial with the first waist-shaped through hole is provided in the middle of the top cover sheet on the periphery of the waist-shaped layer hole, the explosion-proof valve sleeve is arranged in the waist-shaped layer hole, the outer periphery of the explosion-proof valve is connected to the upper end of the top cover sheet by a first laser weld, and the first laser weld is provided on the positive side of the top cover sheet. The outer shape of the explosion-proof valve protection cover is set to be a waist shape consistent with the outer shape of the explosion-proof valve, a second waist-shaped through hole is provided in the middle of the upper side wall, and a flange extending outward is provided on the outer periphery of the lower end, and the flange is sleeved in the annular waist-shaped groove, and the outer periphery of the flange is connected to the upper end of the top cover piece by a second laser weld, and the second laser weld is provided on the front of the top cover piece. An explosion-proof valve protection patch is provided on the upper end surface of the explosion-proof valve protection cover, and the explosion-proof valve protection patch completely covers the second waist-shaped through hole, and an air vent is provided in the middle of the left side wall of the second waist-shaped through hole on the upper end of the explosion-proof valve protection cover, and the air vent is connected to the second waist-shaped through hole.

[0006] The explosion-proof valve protection patch is connected to the explosion-proof valve protection cover by bonding. The explosion-proof valve protection cover and the explosion-proof valve protection patch play a certain protective role on the explosion-proof valve. They can prevent the electrolytic cell from splashing into the explosion-proof valve protection cover when the battery is injected with electrolyte, corroding the explosion-proof valve and reducing the safety performance and service life of the battery. At the same time, it also prevents dust from falling into the explosion-proof valve protection cover.

[0007] Furthermore, the explosion-proof valve includes a valve body and a fixing part, the fixing part is arranged on the outer periphery of the valve body, the thickness of the fixing part is greater than the thickness of the valve body, the thickness of the fixing part is consistent with the depth of the waist-shaped layer hole, and is set to 0.45~0.6mm, the thickness of the valve body is set to 0.15~0.23mm, and the valve body is provided with a notch, the notch is arranged in the first waist-shaped through hole, and the residual thickness at the notch is set to 0.045~0.075mm.

[0008] Furthermore, it also includes a lower insulating member, a negative pole, a negative sealing ring and a negative upper insulating member, the lower insulating member is a plastic member, the upper plane is in contact with the lower plane of the top cover, a first through hole is provided on the left side of the upper plane of the top cover, a plurality of square grooves are provided on the periphery of the first through hole, a coaxial first layer of holes is provided below the first through hole, a second through hole is provided on the left side of the lower insulating member and the coaxial second through hole is provided below the second through hole, and a first square layer of holes is provided. The negative pole includes a negative cylindrical portion and a negative pole. A flat plate portion, wherein a first annular groove is provided in the middle of the outer circular surface of the negative cylindrical portion, the negative cylindrical portion passes through the second through hole and the first through hole in sequence from bottom to top, the negative flat plate portion is provided in the first square layer hole, the negative sealing ring is sleeved between the outer side surface of the lower end of the negative cylindrical portion, the inner side surface of the first through hole, the upper side surface of the first layer hole and the upper plane of the negative flat plate portion, sealing the negative electrode column and the top cover sheet, the upper plane of the negative sealing ring is lower than the upper plane of the top cover sheet, and the lower end surface of the negative flat plate portion is lower than the lower end surface of the first square layer hole;

[0009] The negative electrode upper insulating member is a plastic member, which is sleeved on the outer surface of the negative electrode cylindrical portion, and is provided with a third through hole in the middle that matches the outer diameter of the negative electrode cylindrical portion. A first inner annular boss that is matched and engaged with the first annular groove is provided on the inner side wall of the third through hole. A first flange extending outward is provided on the outer circular surface of the lower end of the negative electrode upper insulating member. The lower end surface of the first flange is in contact with the upper plane of the top cover sheet, and the lower end surface of the first flange is provided with a square boss that is matched and engaged with the corresponding position of the square groove. A first lower annular boss is also provided on the lower end surface of the first flange that is matched and sleeved with the inner side surface of the first through hole and the outer side surface of the negative electrode cylindrical portion.

[0010] After the top cover sheet, the lower insulating member, the negative electrode column, and the negative electrode sealing ring are installed, the negative electrode upper insulating member is injection molded together with the top cover sheet, the lower insulating member, the negative electrode column, and the negative electrode sealing ring to form an integral structure;

[0011] The upper end surface of the negative pole column is higher than the upper end surface of the negative pole upper insulating member and higher than the upper end surface of the explosion-proof valve protection cover.

[0012] Furthermore, a plurality of circular grooves are evenly distributed around the periphery of the first through hole on the upper plane of the top cover plate. The circular grooves are staggered with the square grooves. A circular boss is provided on the lower end surface of the first flange of the negative electrode upper insulating member at a position corresponding to each circular groove. The circular bosses are formed by injection molding.

[0013] Furthermore, it also includes a lower insulating member, a positive pole, a positive sealing ring and a positive upper insulating member, the lower insulating member is a plastic member, the upper plane is in contact with the lower plane of the top cover, a fourth through hole is provided on the right side of the upper plane of the top cover, a plurality of square grooves are provided on the periphery of the fourth through hole, a coaxial second layer of holes is provided below the fourth through hole, a fifth through hole is provided on the right side of the lower insulating member and is coaxial with the fourth through hole, a second square layer of holes is provided below the fifth through hole, the positive pole includes a positive cylindrical portion and a positive A positive plate portion, wherein a second annular groove is provided in the middle of the outer circular surface of the positive cylindrical portion, the positive cylindrical portion passes through the fifth through hole and the fourth through hole in sequence from bottom to top, the positive flat portion is provided in the second square layer hole, and the positive sealing ring is sleeved between the outer side surface of the lower end of the positive cylindrical portion, the inner side surface of the fourth through hole, the upper side surface of the second layer hole and the upper plane of the positive flat portion to seal the positive column and the top cover sheet, the upper plane of the positive sealing ring is lower than the upper plane of the top cover sheet, and the lower end surface of the positive flat portion is lower than the lower end surface of the second square layer hole;

[0014] The positive electrode upper insulating member is a plastic member, which is sleeved on the outer surface of the positive electrode cylindrical portion, and is provided with a sixth through hole in the middle that matches the outer diameter of the positive electrode cylindrical portion. A second inner annular boss that is matched and clipped is provided on the inner side wall of the sixth through hole at a position corresponding to the second annular groove. A second flange extending outward is provided on the outer circular surface of the lower end of the positive electrode upper insulating member, and the lower end surface of the second flange is in contact with the upper plane of the top cover sheet, and the lower end surface of the second flange is provided with a square boss that is matched and clipped at positions corresponding to the square groove. A second lower annular boss that is matched and clipped with the inner side surface of the fourth through hole and the outer side surface of the positive electrode cylindrical portion is also provided on the lower end surface of the second flange;

[0015] After the top cover sheet, the lower insulating member, the positive electrode column, and the positive electrode sealing ring are installed, the positive electrode upper insulating member is injection molded together with the top cover sheet, the lower insulating member, the positive electrode column, and the positive electrode sealing ring to form an integral structure;

[0016] The upper end surface of the positive pole column is higher than the upper end surface of the positive pole upper insulating member and higher than the upper end surface of the explosion-proof valve protection cover.

[0017] Furthermore, a plurality of circular grooves are provided on the upper surface of the top cover sheet, the outer periphery of the fourth through hole being evenly distributed around the circumference. The circular grooves are staggered with the square grooves. A circular boss is provided on the lower end surface of the second flange of the positive electrode upper insulating member at a position corresponding to each circular groove. The circular bosses are formed by injection molding.

[0018] Furthermore, the circular groove is a stepped groove with a larger inner diameter at the top and a smaller inner diameter at the bottom, and the circular boss is a stepped boss with a larger outer diameter at the top and a smaller outer diameter at the bottom.

[0019] Furthermore, a downward extending boss is provided on the lower plane of the top cover piece on the right side of the explosion-proof valve protection cover, and a liquid injection hole is provided on the top cover piece at a position corresponding to the boss, and a coaxial conical expansion hole is provided above the liquid injection hole to facilitate liquid injection.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. The utility model sets the explosion-proof valve in the waist-shaped layer hole of the top cover sheet. The explosion-proof valve fixing part is connected to the upper end of the top cover sheet by a first laser weld. An explosion-proof valve protective cover is set on the outside of the explosion-proof valve. The explosion-proof valve protective cover is connected to the upper end of the top cover sheet by a second laser weld. The first and second laser welds are both set on the front of the top cover sheet, which can effectively prevent the liquid electrolyte from corroding the welds, thereby improving the safety and service life of the new energy battery.

[0022] 2. The utility model ensures the sealing performance between the top cover sheet and the positive electrode column and the negative electrode column by providing a positive electrode sealing ring and a negative electrode sealing ring. The positive electrode upper insulating member and the negative electrode upper insulating member are filled between the negative electrode column and the first through hole, and between the positive electrode column and the fourth through hole by injection molding, and fill several square grooves and circular grooves on the top cover sheet, connecting the positive electrode column, the negative electrode column and the top cover sheet into an integrated structure, greatly improving the insulation performance, sealing performance and mechanical performance of the positive electrode column, the negative electrode column and the top cover sheet. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic structural diagram of an embodiment of the utility model;

[0024] Figure 2 This is a schematic cross-sectional view of an embodiment of the present utility model;

[0025] Figure 3 This is an explosion diagram of an embodiment of the utility model;

[0026] Figure 4 This is a schematic diagram of the front structure of the top cover sheet according to an embodiment of the utility model;

[0027] Figure 5 This is a schematic diagram of the reverse structure of the top cover sheet according to an embodiment of the present utility model;

[0028] Figure 6 This is a schematic diagram of the explosion-proof valve structure of an embodiment of the utility model;

[0029] Figure 7 This is a schematic structural diagram of the explosion-proof valve protection cover according to an embodiment of the present utility model.

[0030] Figure 8 This is a schematic diagram of the structure of the insulating member on the negative electrode of an embodiment of the utility model;

[0031] Figure 9This is a schematic diagram of the structure of the insulating member on the positive electrode of an embodiment of the utility model.

[0032] In the figure: 1. Top cover plate, 101. First waist-shaped through hole, 102. Waist-shaped layer hole, 103. Annular waist-shaped groove, 104. First through hole, 105. First layer hole, 106. Fourth through hole, 107. Second layer hole, 108. Square groove, 109. Circular groove, 110. Filling hole, 111. Third layer hole, 2. Lower insulating member, 201. Second through hole, 202. Fifth through hole, 203. First square layer hole, 204. Second square layer hole, 3. Negative pole, 301. Negative cylindrical portion, 302. First annular groove, 303. Negative flat plate portion, 4. Positive pole, 401. Positive cylindrical portion, 402. Second annular groove, 403, positive electrode flat plate part, 5a, negative electrode sealing ring, 5b, positive electrode sealing ring, 6, negative electrode upper insulating part, 601, third through hole, 602, first inner annular boss, 603, first flange, 604, square right convex, 605, circular boss, 7, positive electrode upper insulating part, 701, sixth through hole, 702, second inner annular boss, 703, second flange, 704, square right convex, 705, circular boss, 8, explosion-proof valve, 9, explosion-proof valve protection cover, 901, second waist-shaped through hole, 902, flange, 10, explosion-proof valve protection patch, 11a, first laser weld, 11b, second laser weld. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside" and the like to indicate directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings and are only used to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0035] like Figures 1 to 8As shown, the embodiment of the utility model includes a top cover sheet 1, an explosion-proof valve 8 and an explosion-proof valve protective cover 9. The explosion-proof valve 8 is waist-shaped and is arranged in the middle of the top cover sheet 1. A first waist-shaped through hole 101 is provided in the middle of the top cover sheet 1. A coaxial waist-shaped layer hole 102 is provided above the first waist-shaped through hole 101. An annular waist-shaped groove 103 coaxial with the first waist-shaped through hole 101 is provided in the middle of the top cover sheet 1 at the periphery of the waist-shaped layer hole 102. The explosion-proof valve 8 is sleeved in the waist-shaped layer hole 102. The outer periphery of the explosion-proof valve 8 is connected to the upper end of the top cover sheet 1 by a first laser weld 11a. The first laser weld 11a is provided on the front of the top cover sheet 1. The shape of the explosion-proof valve protective cover 9 is set to be the same as the explosion-proof valve. The valve 8 has a consistent waist-shaped appearance, with a second waist-shaped through hole 901 provided in the middle of the upper side wall, and a flange 902 extending outward on the outer periphery of the lower end. The flange 902 is sleeved in the annular waist-shaped groove 103, and the outer periphery of the flange 902 is connected to the upper end of the top cover piece 1 through a second laser weld 11b. The second laser weld 11b is provided on the front of the top cover piece. An explosion-proof valve protection patch 10 is provided on the upper end surface of the explosion-proof valve protection cover 9. The explosion-proof valve protection patch 10 completely covers the second waist-shaped through hole 902. An air vent 903 is provided in the middle of the left side wall of the second waist-shaped through hole 901 on the upper end of the explosion-proof valve protection cover 9. The air vent 903 is connected to the second waist-shaped through hole 901.

[0036] In this embodiment, the explosion-proof valve 8 is arranged in the waist-shaped layer hole 102 of the top cover sheet 1. The upper plane of the periphery of the explosion-proof valve 8 is flush with the upper plane of the top cover sheet 1 and is laser welded. An explosion-proof valve protective cover 9 is provided on the outside of the explosion-proof valve 8. The explosion-proof valve protective cover 9 and the top cover sheet 1 are laser welded. Both welds are arranged on the front side of the top cover sheet 1, which can effectively prevent liquid electrolyte from corroding the welds, thereby improving the safety and service life of the new energy battery.

[0037] The explosion-proof valve protection patch 10 is connected to the explosion-proof valve protection cover 9 by bonding. The explosion-proof valve protection cover 9 and the explosion-proof valve protection patch 10 play a certain protective role on the explosion-proof valve 8. They can prevent the electrolytic cell from splashing into the explosion-proof valve protection cover 9 when the battery is injected with electrolyte, corroding the explosion-proof valve 8 and reducing the safety performance and service life of the battery. At the same time, it also prevents dust from falling into the explosion-proof valve protection cover 9.

[0038] Furthermore, the explosion-proof valve 8 includes a valve body 801 and a fixing part 802. The fixing part 802 is arranged on the outer periphery of the valve body 801. The thickness of the fixing part 802 is greater than the thickness of the valve body 801. The thickness of the fixing part 802 is consistent with the depth of the waist-shaped layer hole 102, which is set to 0.45~0.6mm. The thickness of the valve body 801 is set to 0.15~0.23mm. A notch 803 is provided on the valve body 801. The notch 803 is arranged in the first waist-shaped through hole 101, and the residual thickness at the notch 803 is set to 0.045~0.075mm.

[0039] Furthermore, this embodiment also includes a lower insulating member 2, a negative electrode column 3, a negative electrode sealing ring 5a and a negative electrode upper insulating member 6. The lower insulating member 2 is a plastic member, and the upper plane is in contact with the lower plane of the top cover sheet 1. A first through hole 104 is provided on the left side of the upper plane of the top cover sheet 1. The first through hole 104 is provided with 8 square grooves 108 uniformly distributed around the periphery. A coaxial first layer of holes 105 is provided below the first through hole 104. A second through hole 201 coaxial with the first through hole 104 is provided on the left side of the lower insulating member 2. A first square layer of holes 203 is provided below the second through hole 201. The negative electrode column 3 includes a negative cylindrical portion 301 and a negative flat portion. 303, a first annular groove 302 is provided in the middle of the outer surface of the negative cylindrical portion 301, and the negative cylindrical portion 301 passes through the second through hole 201 and the first through hole 104 from bottom to top in sequence. The negative flat portion 303 is provided in the first square layer hole 203, and the negative sealing ring 5a is sleeved between the outer side surface of the lower end of the negative cylindrical portion 301, the inner side surface of the first through hole 104, the upper side surface of the first layer hole 105, and the upper plane of the negative flat portion 303, sealing the negative electrode column 3 with the top cover sheet 1. The upper plane of the negative sealing ring 5a is lower than the upper plane of the top cover sheet 1, and the lower end surface of the negative flat portion 303 is lower than the lower end surface of the first square layer hole 203;

[0040] The negative electrode upper insulating member 6 is a plastic member, which is sleeved on the outer surface of the negative electrode cylindrical portion 301. A third through hole 601 is provided in the middle, which matches the outer diameter of the negative electrode cylindrical portion 301. A first inner annular boss 602 is provided on the inner side wall of the third through hole 601, which corresponds to the first annular groove 302 and is engaged with the first annular groove 302. A first flange 603 is provided on the outer circular surface of the lower end of the negative electrode upper insulating member 6, which extends outward. The lower end surface of the first flange 603 is in contact with the upper plane of the top cover sheet 1, and the lower end surface of the first flange 603 is provided with a square boss 605 at the corresponding position of the square groove 108, which is engaged with the first lower annular boss 604. The lower end surface of the first flange 603 is also provided with the inner side surface of the first through hole 104 and the outer side surface of the negative electrode cylindrical portion 301.

[0041] After the top cover sheet 1, the lower insulating member 2, the negative electrode column 3, and the negative electrode sealing ring 5a are installed, the negative electrode upper insulating member 6 is injection molded together with the top cover sheet 1, the lower insulating member 2, the negative electrode column 3, and the negative electrode sealing ring 5a to form an integral structure;

[0042] The negative electrode upper insulating member 6 is filled between the negative electrode column 3 and the first through hole 101 by injection molding to form a first lower annular boss 604, and fills the eight square grooves 108 on the top cover sheet 1 arranged on the periphery of the first through hole 101 to form eight square bosses 605, connecting the negative electrode column 3 and the top cover sheet 1 into an integrated structure, greatly improving the insulation performance, sealing performance and mechanical performance of the negative electrode column 3 and the top cover sheet 1.

[0043] The upper end surface of the negative electrode column 3 is higher than the upper end surface of the negative electrode upper insulating member 6 and higher than the upper end surface of the explosion-proof valve protection cover 9.

[0044] Furthermore, eight circular grooves 109 evenly distributed around the periphery of the first through hole 104 on the upper plane of the top cover sheet 1 are provided. The circular grooves 109 are staggered with the square grooves 108. A circular boss 606 that matches and engages with each circular groove 109 is provided on the lower end surface of the first flange 603 of the negative electrode insulating part 6.

[0045] The negative electrode upper insulating member 6 is formed by filling the eight circular grooves 109 provided on the top cover sheet 1 around the first through hole 101 by injection molding to form eight circular bosses 606, further improving the insulation performance, sealing performance and mechanical performance of the negative electrode column 3 and the top cover sheet 1.

[0046] Furthermore, the present embodiment further includes a positive electrode column 4, a positive electrode sealing ring 5b and a positive electrode upper insulating member 7. A fourth through hole 106 is provided on the right side of the upper plane of the top cover sheet 1. Eight square grooves 108 are provided on the periphery of the fourth through hole 106 and are evenly distributed around the circumference. A coaxial second layer of holes 107 is provided below the fourth through hole 106. A fifth through hole 202 is provided on the right side of the lower insulating member 2 and is coaxial with the fourth through hole 106. A second square layer of holes 204 is provided below the fifth through hole 202. The positive electrode column 4 includes a positive cylindrical portion 401 and a positive flat portion 403. The outer surface of the positive cylindrical portion 401 is provided with a A second annular groove 402 is provided between the positive cylindrical portion 401 and the positive plate portion 403. The positive cylindrical portion 401 passes through the fifth through hole 202 and the fourth through hole 106 from bottom to top in sequence. The positive plate portion 403 is provided in the second square layer hole 204. The positive sealing ring 5b is provided between the outer side surface of the lower end of the positive cylindrical portion 401, the inner side surface of the fourth through hole 106, the upper side surface of the second layer hole 107 and the upper plane of the positive plate portion 403 to seal the positive column 4 with the top cover sheet 1. The upper plane of the positive sealing ring 5b is lower than the upper plane of the top cover sheet 1, and the lower end surface of the positive plate portion 403 is lower than the lower end surface of the second square layer hole 204.

[0047] The positive electrode upper insulating member 7 is a plastic member, which is sleeved on the outer surface of the positive electrode cylindrical portion 401. A sixth through hole 701 is provided in the middle, which matches the outer diameter of the positive electrode cylindrical portion 401. A second inner annular boss 702 is provided on the inner side wall of the sixth through hole 701, which corresponds to the second annular groove 402 and is engaged with the second inner annular boss 702. A second flange 703 extending outward is provided on the outer circular surface of the lower end of the positive electrode upper insulating member 7. The lower end surface of the second flange 703 is in contact with the upper plane of the top cover sheet 1, and the lower end surface of the second flange 703 is provided with a square boss 705 at the corresponding position of the square groove 108, which is engaged with the second inner annular boss 704. The lower end surface of the second flange 703 is also provided with a second lower annular boss 704, which is sleeved with the inner side surface of the fourth through hole 106 and the outer side surface of the positive electrode cylindrical portion 401.

[0048] After the top cover sheet 1, the lower insulating member 2, the positive electrode column 4, and the positive electrode sealing ring 5b are installed, the positive electrode upper insulating member 7 is injection molded together with the top cover sheet 1, the lower insulating member 2, the positive electrode column 4, and the positive electrode sealing ring 5b to form an integral structure;

[0049] The positive electrode upper insulating member 7 is filled between the positive electrode column 4 and the fourth through hole 106 by injection molding, and fills the 8 square grooves 108 on the top cover sheet 1 arranged on the periphery of the fourth through hole 106, connecting the positive electrode column 4 and the top cover sheet 1 into an integrated structure, thereby greatly improving the insulation performance, sealing performance and mechanical performance of the positive electrode column 4 and the top cover sheet 1.

[0050] The upper end surface of the positive electrode column 4 is higher than the upper end surface of the positive electrode upper insulating member 7 and higher than the upper end surface of the explosion-proof valve protection cover 9.

[0051] Furthermore, eight circular grooves 109 evenly distributed around the circumference are provided on the outer periphery of the fourth through hole 106 on the upper plane of the top cover sheet 1. The circular grooves 109 are staggered with the square grooves 108. A circular boss 706 that matches and engages with each circular groove 109 is provided on the lower end surface of the second flange 703 of the positive electrode insulating member 7.

[0052] The positive electrode upper insulating member 7 is filled in the eight circular grooves 109 provided on the outer periphery of the fourth through hole 106 on the top cover sheet 1 by injection molding to form eight circular bosses 706, further improving the insulation performance, sealing performance and mechanical performance of the positive electrode column 4 and the top cover sheet 1.

[0053] Furthermore, the circular groove 109 is a stepped groove with a larger inner diameter at the top and a smaller inner diameter at the bottom, and the circular bosses 606 and 706 are stepped bosses with a larger outer diameter at the top and a smaller outer diameter at the bottom.

[0054] Furthermore, a downward extending boss is provided on the lower plane of the top cover piece 1 on the right side of the explosion-proof valve protection cover 9, and a liquid injection hole 111 is provided on the top cover piece 1 at a position corresponding to the boss, and a coaxial conical expansion hole 110 is provided above the liquid injection hole 111 to facilitate liquid injection.

[0055] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and replacements can be made without departing from the technical principles of the present invention. These improvements and replacements should also be regarded as the scope of protection of the present invention.

Claims

1. A new energy battery cover, comprising a top cover and an explosion-proof valve, wherein the explosion-proof valve is waist-shaped and disposed in the middle of the top cover, and is characterized in that: It also includes an explosion-proof valve protection cover, a first waist-shaped through hole is provided in the middle of the top cover sheet, a coaxial waist-shaped layer hole is provided above the first waist-shaped through hole, an annular waist-shaped groove coaxial with the first waist-shaped through hole is provided in the middle of the top cover sheet at the periphery of the waist-shaped layer hole, the explosion-proof valve sleeve is arranged in the waist-shaped layer hole, the outer periphery of the explosion-proof valve is connected to the upper end of the top cover sheet by a first laser weld, the first laser weld is provided on the front of the top cover sheet, the shape of the explosion-proof valve protection cover is set to be waist-shaped consistent with the shape of the explosion-proof valve, and the upper side wall is provided with a waist-shaped groove coaxial with the first waist-shaped through hole. A second waist-shaped through hole is provided in the middle, and a flange extending outward is provided on the outer periphery of the lower end. The flange is sleeved in the annular waist-shaped groove, and the outer periphery of the flange is connected to the upper end of the top cover piece by a second laser weld. The second laser weld is provided on the front of the top cover piece. An explosion-proof valve protection patch is provided on the upper end surface of the explosion-proof valve protection cover, and the explosion-proof valve protection patch completely covers the second waist-shaped through hole. An air vent is provided in the middle of the left side wall of the second waist-shaped through hole on the upper end of the explosion-proof valve protection cover, and the air vent is connected to the second waist-shaped through hole.

2. The new energy battery cover according to claim 1, characterized in that: The explosion-proof valve includes a valve body and a fixing part, the fixing part is arranged on the outer periphery of the valve body, the thickness of the fixing part is greater than the thickness of the valve body, the thickness of the fixing part is consistent with the depth of the waist-shaped layer hole, and is set to 0.45~0.6mm, the thickness of the valve body is set to 0.15~0.23mm, and the valve body is provided with a notch, the notch is arranged in the first waist-shaped through hole, and the residual thickness at the notch is set to 0.045~0.075mm.

3. The new energy battery cover according to claim 1, characterized in that: It also includes a lower insulating member, a negative pole, a negative sealing ring and a negative upper insulating member. The lower insulating member is a plastic member, and the upper plane is in contact with the lower plane of the top cover. A first through hole is provided on the left side of the upper plane of the top cover, and a plurality of square grooves are provided on the periphery of the first through hole. A coaxial first layer of holes is provided below the first through hole. A second through hole is provided on the left side of the lower insulating member that is coaxial with the first through hole, and a first square layer of holes is provided below the second through hole. The negative pole includes a negative cylindrical portion and a negative flat plate. A first annular groove is provided in the middle of the outer circular surface of the negative cylindrical portion, the negative cylindrical portion passes through the second through hole and the first through hole in sequence from bottom to top, the negative flat portion is provided in the first square layer hole, the negative sealing ring is sleeved between the outer side surface of the lower end of the negative cylindrical portion, the inner side surface of the first through hole, the upper side surface of the first layer hole and the upper plane of the negative flat portion, sealing the negative electrode column and the top cover sheet, the upper plane of the negative sealing ring is lower than the upper plane of the top cover sheet, and the lower end surface of the negative flat portion is lower than the lower end surface of the first square layer hole; The negative electrode upper insulating member is a plastic member, which is sleeved on the outer surface of the negative electrode cylindrical portion, and is provided with a third through hole in the middle that matches the outer diameter of the negative electrode cylindrical portion. A first inner annular boss that is matched and engaged with the first annular groove is provided on the inner side wall of the third through hole. A first flange extending outward is provided on the outer circular surface of the lower end of the negative electrode upper insulating member. The lower end surface of the first flange is in contact with the upper plane of the top cover sheet, and the lower end surface of the first flange is provided with a square boss that is matched and engaged with the corresponding position of the square groove. A first lower annular boss is also provided on the lower end surface of the first flange that is matched and sleeved with the inner side surface of the first through hole and the outer side surface of the negative electrode cylindrical portion. After the top cover sheet, the lower insulating member, the negative electrode column, and the negative electrode sealing ring are installed, the negative electrode upper insulating member is injection molded together with the top cover sheet, the lower insulating member, the negative electrode column, and the negative electrode sealing ring to form an integral structure; The upper end surface of the negative pole column is higher than the upper end surface of the negative pole upper insulating member and higher than the upper end surface of the explosion-proof valve protection cover.

4. The new energy battery cover according to claim 3, characterized in that: A plurality of circular grooves are also provided on the periphery of the first through hole on the upper plane of the top cover sheet, and the circular grooves are staggered with the square grooves. A circular boss is provided on the lower end surface of the first flange of the negative electrode upper insulating part at a position corresponding to each circular groove.

5. The new energy battery cover according to claim 1, characterized in that: It also includes a lower insulating member, a positive pole, a positive sealing ring and a positive upper insulating member. The lower insulating member is a plastic member, and the upper plane is in contact with the lower plane of the top cover. A fourth through hole is provided on the right side of the upper plane of the top cover, and a plurality of square grooves are provided on the periphery of the fourth through hole. A coaxial second layer of holes is provided below the fourth through hole. A fifth through hole is provided on the right side of the lower insulating member, which is coaxial with the fourth through hole, and a second square layer of holes is provided below the fifth through hole. The positive pole includes a positive cylindrical portion and a positive flat portion. The plate portion, a second annular groove is provided in the middle of the outer circular surface of the positive cylindrical portion, the positive cylindrical portion passes through the fifth through hole and the fourth through hole in sequence from bottom to top, the positive flat plate portion is provided in the second square layer hole, the positive sealing ring is provided between the outer side surface of the lower end of the positive cylindrical portion, the inner side surface of the fourth through hole, the upper side surface of the second layer hole and the upper plane of the positive flat plate portion, and the positive electrode column is sealed with the top cover sheet, the upper plane of the positive sealing ring is lower than the upper plane of the top cover sheet, and the lower end surface of the positive flat plate portion is lower than the lower end surface of the second square layer hole; The positive electrode upper insulating member is a plastic member, which is sleeved on the outer surface of the positive electrode cylindrical portion, and is provided with a sixth through hole in the middle that matches the outer diameter of the positive electrode cylindrical portion. A second inner annular boss that is matched and clipped is provided on the inner side wall of the sixth through hole at a position corresponding to the second annular groove. A second flange extending outward is provided on the outer circular surface of the lower end of the positive electrode upper insulating member, and the lower end surface of the second flange is in contact with the upper plane of the top cover sheet, and the lower end surface of the second flange is provided with a square boss that is matched and clipped at positions corresponding to the square groove. A second lower annular boss that is matched and clipped with the inner side surface of the fourth through hole and the outer side surface of the positive electrode cylindrical portion is also provided on the lower end surface of the second flange; After the top cover sheet, the lower insulating member, the positive electrode column, and the positive electrode sealing ring are installed, the positive electrode upper insulating member is injection molded together with the top cover sheet, the lower insulating member, the positive electrode column, and the positive electrode sealing ring to form an integral structure; The upper end surface of the positive pole column is higher than the upper end surface of the positive pole upper insulating member and higher than the upper end surface of the explosion-proof valve protection cover.

6. The new energy battery cover according to claim 5, characterized in that: A plurality of circular grooves evenly distributed around the circumference are further provided on the periphery of the fourth through hole on the upper plane of the top cover plate. The circular grooves are staggered with the square grooves. A circular boss corresponding to each circular groove is provided on the lower end surface of the second flange of the positive electrode upper insulating member.

7. A new energy battery cover according to claim 4 or 6, characterized in that: The circular groove is a stepped groove with a larger inner diameter at the top and a smaller inner diameter at the bottom, and the circular boss is a stepped boss with a larger outer diameter at the top and a smaller outer diameter at the bottom.

8. The new energy battery cover according to claim 1, characterized in that: A downwardly extending boss is provided on the lower plane of the top cover sheet at the right side of the explosion-proof valve protection cover, a liquid injection hole is provided on the top cover sheet at a position corresponding to the boss, and a coaxial conical expansion hole is provided above the liquid injection hole.

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