Upper cover and square battery

Abstract

The utility model provides an upper cover and a square battery. The upper cover comprises a cover plate, a support, a pole, an injection molding part, an anti-explosion valve, a protection sheet and a sealing nail. The cover plate is provided with a pole hole, a pressure relief hole and a liquid injection hole. The pole hole comprises a first through hole and a clamping groove. The side wall of the pressure relief hole comprises a first step and a second step. The support comprises a main body piece and a clamping ring. The main body piece is provided with a second through hole, an exhaust hole and a liquid inlet hole. The clamping ring is arranged in the clamping groove, and the side wall of the first through hole protrudes out of the ring inner side face of the clamping ring. The pole comprises a pole piece and a convex column, and the convex column is provided with a limiting groove. The injection molding part is provided with a first limiting ring and a second limiting ring, the inner cavity of the clamping ring is filled with the first limiting ring, and the limiting groove is filled with the second limiting ring. The anti-explosion valve edge is arranged in a hole defined by the second step, and the outer periphery of the anti-explosion valve is welded to the second step. The square battery comprises the upper cover. According to the upper cover and the square battery, the risk of liquid leakage of the square battery can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of square batteries, in particular to an upper cover and a square battery. Background Art

[0002] With the development of modern society and the enhancement of people's environmental awareness, more and more devices choose lithium batteries as power sources, such as mobile phones, laptops, power tools and electric vehicles, etc., which provides a broad space for the application and development of lithium batteries. Among them, the lithium batteries used in power tools and electric vehicles are generally called square batteries.

[0003] The square battery in the prior art usually includes a top cover and a shell. The top cover includes a cover plate, a bracket, a pole, an injection molded part and an explosion-proof valve. The cover plate and the bracket are stacked, the cover plate is located above the bracket, the pole is passed through the cover plate and the bracket, and the injection molded part is arranged between the pole and the cover plate and the bracket to play a role of sealing and insulation. A pressure relief hole is provided on the cover plate, and the explosion-proof valve is welded in the pressure relief hole. The injection molded part has fewer snap-on structures and is easy to fall off, resulting in poor sealing performance of the square battery and a risk of leakage. When the explosion-proof valve is welded on the top cover, it is not easy to operate, which affects the welding quality and also has the risk of leakage.

[0004] Therefore, it is necessary to provide a top cover and a square battery to solve the above technical problems. Utility Model Content

[0005] The utility model provides an upper cover and a square battery, which can effectively reduce the risk of liquid leakage of the square battery and improve the performance of the square battery.

[0006] The technical solution of the utility model is:

[0007] A top cover, comprising:

[0008] A cover plate, which is provided with a pole hole, a pressure relief hole and a liquid injection hole, wherein the pole hole includes a first through hole and a clamping groove arranged along the thickness direction of the cover plate, the clamping groove is connected to the bottom surface of the cover plate, the clamping groove is connected to the first through hole, and the clamping groove is annularly arranged around the first through hole; the side wall of the pressure relief hole includes a first step and a second step arranged in sequence along the thickness direction of the cover plate, the first step and the second step are both annular, the aperture of the second step is larger than the aperture of the first step, and the first step is closer to the bottom surface of the cover plate relative to the second step;

[0009] A bracket, comprising a main body sheet and a clamping ring; the main body sheet abuts against the bottom of the cover plate and is provided with a second through hole, an exhaust hole and a liquid inlet hole, the exhaust hole is located below the pressure relief hole, the liquid inlet hole is coaxially arranged with the liquid injection hole, the clamping ring is connected to the top surface of the main body sheet and is coaxially arranged with the second through hole, the clamping ring is arranged in the clamping groove, and the side wall of the first through hole is close to the central axis of the first through hole relative to the inner side surface of the clamping ring;

[0010] A pole, comprising a pole piece and a protruding column, wherein the top surface of the pole piece abuts against the bottom surface of the main body piece, the protruding column protrudes from the top surface of the pole piece and is penetrated through the first through hole and the second through hole, the protruding column is spaced apart from the cover plate and the bracket, an annular limiting groove is provided along the circumference of one end of the protruding column close to the pole piece, and a threaded hole is provided at one end of the protruding column away from the pole piece;

[0011] An injection molded part, which is annular, is injection molded between the pole, the cover plate and the bracket, a first limiting ring is arranged on the outer side of the ring of the injection molded part along its circumference, the first limiting ring is filled in the inner cavity of the clamping ring, the periphery of the first through hole is clamped between the upper part of the injection molded part and the first limiting ring, a second limiting ring is arranged on the inner side of the ring of the injection molded part along its circumference, and the second limiting ring is filled in the limiting groove;

[0012] an explosion-proof valve, the outer periphery of which is arranged in the hole surrounded by the second step, the bottom surface of the outer periphery of the explosion-proof valve abuts against the top surface of the first step, and the outer periphery of the explosion-proof valve is welded to the second step;

[0013] a protective sheet covering the pressure relief hole, the protective sheet being located on a side of the second step away from the first step, the explosion-proof valve being spaced apart from the protective sheet; and,

[0014] A sealing pin is arranged in the liquid injection hole.

[0015] In the upper cover described in the utility model, the side wall of the second through hole is away from the central axis of the second through hole relative to the inner wall of the clamping ring, and a third limiting ring is arranged along the circumference of the outer side surface of the ring of the injection molded part, and the third limiting ring is filled in the second through hole, and the clamping ring is clamped between the third limiting ring and the periphery of the first through hole.

[0016] In the upper cover of the utility model, a first groove is arranged along the circumference of one end of the convex column away from the pole piece; a first convex ring is arranged on the top surface of the injection molded part, and the top surface of the first convex ring is flush with the bottom side wall of the first groove;

[0017] The pole hole also includes a second groove, which is annular and arranged around the first through hole. The second groove is connected to the top surface of the cover plate and is connected to the first through hole. The outer side surface of the ring of the injection molded part is provided with a second convex ring along its circumference, and the second convex ring is filled in the second groove.

[0018] In the upper cover described in the utility model, a third through hole is arranged on the periphery of the first through hole, and the third through hole is connected to the second groove and the clamping groove; the injection molded part is provided with a connecting column, which is arranged in the third through hole, and the connecting column connects the second convex ring and the first limiting ring.

[0019] In the upper cover described in the utility model, the side wall of the pressure relief hole is also provided with an annular third step and a fourth step along its axial direction, the third step is connected to the second step, the aperture of the third step is larger than the aperture of the second step, the fourth step is connected to the third step, the aperture of the fourth step is larger than the aperture of the third step; the protective sheet is fixed on the top surface of the third step, and the side surface of the protective sheet is abutted against the side surface of the fourth step.

[0020] In the upper cover described in the utility model, a frame groove is provided on the main body sheet, the frame groove is located below the pressure relief hole, the exhaust hole is provided at the bottom of the frame groove, and the main body sheet is convex downward at the frame groove.

[0021] In the upper cover described in the utility model, the upper cover also includes a copper block, the upper surface of the copper block is provided with a boss, the boss is welded to the bottom surface of the pole piece, and the area of ​​the boss is smaller than the area of ​​the bottom surface of the pole piece.

[0022] In the upper cover of the utility model, the side wall of the injection hole includes an inclined surface, a bearing surface and a limiting surface arranged in sequence along the axial direction thereof; the inclined surface is close to the top surface of the cover plate relative to the bearing surface, the inclined surface is inclined to the central axis of the injection hole, and the aperture of the inclined surface gradually increases from the bottom surface of the cover plate to the top surface of the cover plate; the bearing surface is perpendicular to the central axis of the injection hole; the limiting surface is parallel to the central axis of the injection hole, and a chamfer is provided at one end of the limiting surface close to the inclined surface;

[0023] The sealing pin includes a welding cap and an extension column; the periphery of the welding cap abuts against the bearing surface; the extension column is connected to the center of the bottom surface of the welding cap, the extension column passes through the inner cavity of the limiting surface and abuts against the limiting surface, and the end of the extension column away from the welding cap is provided with a chamfer.

[0024] In the upper cover of the utility model, the side wall of the injection hole includes a cylindrical surface, a first guide surface, a straight surface, and a second guide surface arranged in sequence along the axial direction thereof, the first guide surface is closer to the bottom surface of the cover plate relative to the straight surface, the straight surface is perpendicular to the central axis of the injection hole, the cylindrical surface is parallel to the central axis of the injection hole, the first guide surface and the second guide surface are inclined to the central axis of the injection hole, the apertures of the first guide surface and the second guide surface gradually increase from the bottom surface of the cover plate to the top surface of the cover plate, and the angles between the first guide surface, the second guide surface and the central axis of the injection hole increase in sequence; the straight surface and the first guide surface, and the second guide surface and the straight surface are smoothly transitioned by arc surfaces;

[0025] The sealing nail includes a nail cap, a nail column and a rubber hose; the periphery of the nail cap abuts against the straight surface, and the nail cap is welded to the side wall of the injection hole; the nail column is connected to the center of the bottom surface of the nail cap, and the nail column is penetrated through the first guide surface and the inner cavity of the cylindrical surface; the rubber hose is fixed to the nail column, and the rubber hose is clamped between the cylindrical surface and the nail column.

[0026] In the upper cover described in the utility model, a trumpet-shaped expansion portion is provided at one end of the hose away from the nail cap, and the outer diameter of the expansion portion gradually increases from the end close to the nail cap to the end away from the nail cap, the maximum outer diameter of the expansion portion is smaller than the maximum aperture of the first guide surface, and the expansion portion abuts against the bottom edge of the cylinder.

[0027] Another technical solution of the utility model is:

[0028] A square battery, comprising:

[0029] The upper cover mentioned above, the bracket also includes two supporting structures, which are respectively connected to the two ends of the bottom surface of the main body sheet, and the supporting structure includes a first plate and a plurality of second plates, the first plate and the plurality of second plates are perpendicular to the bottom surface connected to the main body sheet, the first plate is a straight strip, which extends along the width direction of the main body sheet, and the plurality of second plates are arranged along the width direction of the main body sheet and are perpendicularly connected to the first plate;

[0030] a housing having an open end connected to an edge of the cover plate; and

[0031] The pole core is arranged between the shell and the upper cover, the support structure is in contact with the pole core, and the pole core is provided with a pole ear, which is welded to the pole piece.

[0032] Compared with the prior art, the utility model has the following beneficial effects: when processing the injection molded parts of the upper cover and square battery of the utility model, the bracket, cover plate and pole are stacked and assembled in sequence and then placed on the injection mold jig. The injection mold jig, the bracket, cover plate and pole together form a closed injection cavity, and glue is injected into the injection cavity to form the injection molded part. The bracket and the cover plate are firmly connected together by matching the clamping ring and the clamping groove, which is convenient for injection molding. The first limiting ring is limited by the periphery of the first through hole, so that the outer ring side of the injection molded part is not easy to fall out, and the second limiting ring is limited by the limiting groove, so that the inner ring side of the injection molded part is not easy to fall out. The injection molded part is firmly fixed, and the sealing performance of the pole hole is improved. When installing the explosion-proof valve, first place the periphery of the explosion-proof valve in the hole surrounded by the second step, the bottom surface of the periphery of the explosion-proof valve abuts against the top surface of the first step, and the side surface of the periphery of the explosion-proof valve abuts against the side surface of the second step, so as to position the explosion-proof valve, and then weld the periphery of the explosion-proof valve to the second step. The top surface of the second step is used as a welding reserved surface, which makes the welding operation convenient and improves the processing efficiency and welding quality. A protective sheet is also provided on the outer layer of the explosion-proof valve. The pressure relief hole is doubly closed by the explosion-proof valve and the protective sheet, which can effectively improve the sealing performance at the pressure relief hole. The upper cover and square battery of the utility model improve the sealing performance of the hole structures such as the pole hole and the pressure relief hole on the upper cover through the structural design of the upper cover, thereby effectively reducing the risk of leakage of the square battery and improving the performance of the square battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. The drawings described below are only drawings corresponding to some embodiments of the utility model.

[0034] Figure 1 This is a schematic diagram of the overall structure of a square battery provided in the first preferred embodiment of the utility model.

[0035] Figure 2 A schematic diagram of the exploded structure of a square battery provided in the first preferred embodiment of the utility model.

[0036] Figure 3 This is a schematic diagram of the exploded structure of the upper cover provided in the first preferred embodiment of the utility model.

[0037] Figure 4 A schematic diagram of a partial cross-sectional structure of a square battery provided in the first preferred embodiment of the utility model.

[0038] Figure 5 for Figure 4 Schematic diagram of the enlarged structure of part A.

[0039] Figure 6 for Figure 4Schematic diagram of the enlarged structure of part B.

[0040] Figure 7 for Figure 4 Schematic diagram of the enlarged structure of part C.

[0041] Figure 8 Another partial cross-sectional structural schematic diagram of a square battery provided in the first preferred embodiment of the utility model.

[0042] Fig. 9 for Figure 8 Schematic diagram of the enlarged structure of part D.

[0043] Fig.10 for Figure 8 Schematic diagram of the enlarged structure of part E in the middle.

[0044] Fig.11 for Figure 8 Schematic diagram of the enlarged structure of part F.

[0045] Fig.12 A schematic diagram of the front structure of the cover plate of the upper cover provided in the first preferred embodiment of the utility model.

[0046] Fig.13 This is a schematic diagram of the reverse structure of the cover plate of the upper cover provided in the first preferred embodiment of the utility model.

[0047] Fig.14 A front structural schematic diagram of a bracket of an upper cover provided in a first preferred embodiment of the utility model.

[0048] Fig.15 This is a schematic diagram of the reverse structure of the bracket of the upper cover provided in the first preferred embodiment of the utility model.

[0049] Fig.16 A schematic diagram of the cross-sectional exploded structure of the cover plate of the upper cover provided in the second preferred embodiment of the utility model.

[0050] Fig.17 A schematic diagram of the overall cross-sectional structure of the cover plate of the upper cover provided in the second preferred embodiment of the utility model.

[0051] in, Figure 4-Figure 15 The logo is as follows:

[0052] 11. Upper cover,

[0053] 111, cover plate,

[0054] 1111, pole hole, 1111a, first through hole, 1111b, clamping groove, 1111c, second groove,

[0055] 1112, pressure relief hole, 1112a, first step, 1112b, second step, 1112c, third step, 1112d, fourth step,

[0056] 1113, injection hole, 1113a, inclined surface, 1113b, bearing surface, 1113c, limiting surface,

[0057] 1114, a third through hole,

[0058] 112. Bracket,

[0059] 1121, main body sheet, 11211, second through hole, 11212, exhaust hole, 11213, liquid inlet hole, 11214, frame groove,

[0060] 1122, snap ring,

[0061] 1123, supporting structure, 11231, first plate, 11232, second plate,

[0062] 113. Pole,

[0063] 1131, pole piece,

[0064] 1132, a convex column, 11321, a limiting groove, 11322, a first groove, 11323, a threaded hole,

[0065] 114, injection molded part, 1141, first limiting ring, 1142, second limiting ring, 1143, third limiting ring, 1144, first convex ring, 1145, second convex ring,

[0066] 115. Explosion-proof valve,

[0067] 116. Protective film,

[0068] 117, sealing nail, 1171, welding cap, 1172, extension column,

[0069] 118, copper block, 1181, boss,

[0070] 119. Injection cavity,

[0071] 12. Shell,

[0072] 13. Pole core, 131. Pole ear.

[0073] Fig.16 and Fig.17 The logo is as follows:

[0074] 21. cover plate, 211. injection hole, 2111. cylindrical surface, 2112. first flow guide surface, 2113. straight surface, 2114. second flow guide surface, 2115. third flow guide surface,

[0075] 22. Sealing nail, 221. Nail cap, 222. Nail column, 223. Hose, 2231. Expansion part.

[0076] In the figures, structurally similar elements are denoted by the same reference numerals. DETAILED DESCRIPTION

[0077] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0078] Directional terms mentioned in the present invention, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "side", "top" and "bottom", are only used for reference to the directions of the drawings. The directional terms used are used to illustrate and understand the present invention, and are not used to limit the present invention.

[0079] The words "first", "second" and the like in the terminology of the present invention are used for descriptive purposes only and should not be understood as indicating or implying relative importance, and should not be construed as limiting the order of precedence.

[0080] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0081] The square battery in the prior art usually includes a top cover and a shell. The top cover includes a cover plate, a bracket, a pole, an injection molded part and an explosion-proof valve. The cover plate and the bracket are stacked, the cover plate is located above the bracket, the pole is passed through the cover plate and the bracket, and the injection molded part is arranged between the pole and the cover plate and the bracket to play a role of sealing and insulation. A pressure relief hole is provided on the cover plate, and the explosion-proof valve is welded in the pressure relief hole. The injection molded part has fewer snap-on structures and is easy to fall off, resulting in poor sealing performance of the square battery and a risk of leakage. When the explosion-proof valve is welded on the top cover, it is not easy to operate, which affects the welding quality and also has the risk of leakage.

[0082] The following is a preferred embodiment of an upper cover and a square battery provided by the utility model that can solve the above technical problems.

[0083] Please refer to Figure 1 and Figure 2 The first preferred embodiment of the utility model provides a square battery, which includes an upper cover 11, a shell 12 and a pole core 13. The shell 12 is preferably stamped and formed of aluminum alloy or other hardware materials, and can be in a square shape. The shell 12 is provided with an open end, and the open end is connected to the edge of the upper cover 11. The pole core 13 is arranged in a cavity formed between the shell 12 and the upper cover 11.

[0084] Please refer to Figure 3 The upper cover 11 includes a cover plate 111, a bracket 112, a pole 113, an injection molded part 114, an explosion-proof valve 115, a protective sheet 116 and a sealing nail 117. The cover plate 111 can be a square panel structure, preferably made of aluminum alloy or other hardware materials, and its edge is fixedly connected to the open end of the shell 12. The cover plate 111 is provided with a pole hole 1111, a pressure relief hole 1112 and a liquid injection hole 1113. The pole hole 1111 includes a first through hole 1111a and a snap-in groove 1111b arranged along the thickness direction of the cover plate 111, the snap-in groove 1111b is connected to the bottom surface of the cover plate 111, the snap-in groove 1111b is connected to the first through hole 1111a, and the snap-in groove 1111b is annularly arranged around the first through hole 1111a. Two pole holes 1111 can be provided, the first through hole 1111a can be circular, and the snap-in groove 1111b can be annular. The side wall of the pressure relief hole 1112 includes a first step 1112a and a second step 1112b arranged in sequence along the thickness direction of the cover plate 111. The first step 1112a and the second step 1112b are both annular. The aperture of the second step 1112b is larger than the aperture of the first step 1112a. The first step 1112a is closer to the bottom surface of the cover plate 111 relative to the second step 1112b.

[0085] The bracket 112 includes a main body sheet 1121 and a clamping ring 1122. The main body sheet 1121 is in contact with the bottom of the cover plate 111, and is provided with a second through hole 11211, an exhaust hole 11212 and a liquid inlet hole 11213. The exhaust hole 11212 is located below the pressure relief hole 1112, and the liquid inlet hole 11213 is coaxially arranged with the liquid injection hole 1113. The clamping ring 1122 is connected to the top surface of the main body sheet 1121 and is coaxially arranged with the second through hole 11211. The clamping ring 1122 is arranged in the clamping groove 1111b, and the side wall of the first through hole 1111a is close to the central axis of the first through hole 1111a relative to the inner side of the ring of the clamping ring 1122. The second through hole 11211 can be circular. The pole 113 includes a pole piece 1131 and a boss 1132. The top surface of the pole piece 1131 abuts against the bottom surface of the main body piece 1121. The boss 1132 protrudes from the top surface of the pole piece 1131 and is penetrated through the first through hole 1111a and the second through hole 11211. The boss 1132 is spaced apart from the cover plate 111 and the bracket 112. The end of the boss 1132 close to the pole piece 1131 is provided with an annular limiting groove 11321 along its circumference. The end of the boss 1132 away from the pole piece 1131 is provided with a threaded hole 11323 to facilitate the connection of the pole 113 with other structures. The pole 113 can be set to two, one positive and one negative. The material of the pole 113 is preferably aluminum alloy or other hardware materials.

[0086] The injection molded part 114 is annular and is injection molded between the pole 113, the cover plate 111 and the bracket 112. The outer side surface of the ring of the injection molded part 114 is provided with a first limiting ring 1141 along its circumference, and the first limiting ring 1141 is filled in the inner cavity of the clamping ring 1122. The periphery of the first through hole 1111a is clamped between the upper part of the injection molded part 114 and the first limiting ring 1141. The inner side surface of the ring of the injection molded part 114 is provided with a second limiting ring 1142 along its circumference, and the second limiting ring 1142 is filled in the limiting groove 11321. Two injection molded parts 114 can be provided, and the injection molded parts 114 are preferably made of plastic materials such as PP or PE.

[0087] The outer periphery of the explosion-proof valve 115 is arranged in the hole surrounded by the second step 1112b, the bottom surface of the outer periphery of the explosion-proof valve 115 abuts against the top surface of the first step 1112a, and the outer periphery of the explosion-proof valve 115 is welded to the second step 1112b. The protective sheet 116 covers the pressure relief hole 1112, and the protective sheet 116 is located on the side of the second step 1112b away from the first step 1112a, and the explosion-proof valve 115 is spaced apart from the protective sheet 116. The explosion-proof valve 115 is preferably made of plastic material such as PP or PE.

[0088] The sealing nail 117 is disposed in the injection hole 1113. The sealing nail 117 is preferably made of aluminum alloy or other hardware materials.

[0089] The bracket 112 also includes two support structures 1123, which are respectively connected to the two ends of the bottom surface of the main body sheet 1121. The support structure 1123 includes a first plate 11231 and a plurality of second plates 11232, the first plate 11231 and the plurality of second plates 11232 are perpendicular to the bottom surface connected to the main body sheet 1121, the first plate 11231 is a straight strip, which extends along the width direction of the main body sheet 1121, and the plurality of second plates 11232 are arranged along the width direction of the main body sheet 1121 and are vertically connected to the first plate 11231. The bracket 112 is preferably made of plastic material such as PP or PE.

[0090] The support structure 1123 is in contact with the pole core 13. The pole core 13 is provided with a pole ear 131, and the pole ear 131 is welded to the pole piece 1131. The pole core 13 can be wound or laminated, and can be a single pole core or a bipolar core. In the above structure, the two support structures 1123 can limit the pole core 13 of the square battery to prevent the pole core 13 from moving. The support structure 1123 is connected to a cross-bone position by a first plate 11231 and a plurality of second plates 11232. Compared with a solid support structure 1123, it can not only make the support structure 1123 meet the requirements in terms of structural strength, but also reduce the weight of the support structure 1123 and save materials.

[0091] The edge of the cover plate 111 is provided with an L-shaped stop groove, and the opening end of the shell 12 is arranged in the stop groove, so as to prevent the upper cover 11 and the shell 12 from being displaced relative to each other eccentrically, and facilitate accurate assembly.

[0092] When processing the injection molded part 114 of the upper cover 11 and the square battery of the utility model, the bracket 112, the cover plate 111 and the pole 113 are stacked and assembled in sequence and then placed on the injection mold jig. The injection mold jig, the bracket 112, the cover plate 111 and the pole 113 together form a closed injection cavity 119, and the injection molded part 114 is formed by injecting glue into the injection cavity 119. The bracket 112 and the cover plate 111 are matched and connected by the clamping ring 1122 and the clamping groove 1111b, so that the bracket 112 and the cover plate 111 are firmly connected together, which is convenient for injection molding. The first limiting ring 1141 is limited by the periphery of the first through hole 1111a, so that the outer ring side of the injection molded part 114 is not easy to fall out, and the second limiting ring 1142 is limited by the limiting groove 11321, so that the inner ring side of the injection molded part 114 is not easy to fall out, and the injection molded part 114 is firmly fixed, which improves the sealing performance of the pole hole 1111. When installing the explosion-proof valve 115, first place the periphery of the explosion-proof valve 115 in the hole surrounded by the second step 1112b, the periphery bottom surface of the explosion-proof valve 115 abuts against the top surface of the first step 1112a, and the periphery side of the explosion-proof valve 115 abuts against the side of the second step 1112b, thereby positioning the explosion-proof valve 115, and then weld the periphery of the explosion-proof valve 115 to the second step 1112b, and use the top surface of the second step 1112b as a welding reserved surface, so that the welding operation is convenient, and the processing efficiency and welding quality are improved. The outer layer of the explosion-proof valve 115 is also provided with a protective sheet 116, and the pressure relief hole 1112 is double-sealed by the explosion-proof valve 115 and the protective sheet 116, which can effectively improve the sealing performance at the pressure relief hole 1112. The upper cover 11 and the square battery of the utility model improve the sealing performance of the hole structures such as the pole hole 1111 and the pressure relief hole 1112 on the upper cover 11 through the structural design of the upper cover 11, thereby effectively reducing the risk of leakage of the square battery and improving the performance of the square battery.

[0093] The top surface of the periphery of the explosion-proof valve 115 is flush with the top surface of the second step 1112b, and the connection between the two is used for welding to facilitate welding.

[0094] Please refer to Figure 7 , Fig.11 , Fig.14 and Fig.15 , the side wall of the second through hole 11211 is away from the central axis of the second through hole 11211 relative to the inner side wall of the clamping ring 1122, and the third limiting ring 1143 is arranged along the circumference of the outer side of the ring of the injection molded part 114. The third limiting ring 1143 is filled in the second through hole 11211, and the clamping ring 1122 is clamped between the third limiting ring 1143 and the periphery of the first through hole 1111a. In the above structure, the third limiting ring 1143 is limited by the clamping ring 1122, so that the outer side of the injection molded part 114 is not easy to fall out, so that the injection molded part 114 is fixed more firmly, further reducing the risk of leakage of the square battery and improving the performance of the square battery.

[0095] Please refer to Figure 7 and Fig.11 , an L-shaped first groove 11322 is provided along the circumference of one end of the convex column 1132 away from the pole piece 1131. A first convex ring 1144 is provided on the top surface of the injection molded part 114, and the top surface of the first convex ring 1144 is flush with the bottom side wall of the first groove 11322. With this structure, during injection molding, the injection mold jig overlaps the bottom surface below the first groove 11322. After sealing, the glue will not overflow at the junction of the injection mold jig and the convex column 1132, thereby avoiding burrs on the injection molded part 114 at this location and reducing the subsequent process of processing the burrs.

[0096] Please refer to Figure 7 , Fig.11 and Fig.12 , the pole hole 1111 also includes a second groove 1111c, which is annularly arranged around the first through hole 1111a. The second groove 1111c is connected to the top surface of the cover plate 111 and is connected to the first through hole 1111a. The outer side surface of the ring of the injection molded part 114 is provided with a second convex ring 1145 along its circumference, and the second convex ring 1145 is filled in the second groove 1111c. With this structure, during injection molding, the injection mold jig overlaps the top surface of the cover plate 111 and extends in the direction of the second groove 1111c. The glue flows into the second groove 1111c to form the second convex ring 1145. After sealing, the glue will not overflow at the junction of the injection mold jig and the cover plate 111, thereby avoiding the injection molded part 114 from generating burrs there, and reducing the subsequent process of processing the burrs.

[0097] Please refer to Fig.12 and Fig.13 , please combine Figure 7 . A third through hole 1114 is provided on the periphery of the first through hole 1111a, and the third through hole 1114 is connected to the second groove 1111c and the snap-in groove 1111b. The injection molded part 114 is provided with a connecting column, which is arranged in the third through hole 1114, and the connecting column connects the second convex ring 1145 and the first limiting ring 1141. The third through hole 1114 can be set to 5 evenly distributed. With the above structure, when the glue is injected, the glue flows into the third through hole 1114 to form a connecting column, and the connecting column connects the second convex ring 1145 and the first limiting ring 1141, so that the injection molded part 114 is firmly fixed. Here, in other embodiments, a fourth through hole can also be provided on the snap-in ring 1122, and the fourth through hole is connected to the third through hole. The connecting column passes through the third through hole and the fourth through hole, connects the second convex ring 1145 and the third limiting ring 1143, and can simultaneously improve the connection strength between the injection molded part and the cover plate 111 and the bracket 112.

[0098] Please refer to Figure 5 and Fig. 9The side wall of the pressure relief hole 1112 is also provided with an annular third step 1112c and a fourth step 1112d along its axial direction. The third step 1112c is connected to the second step 1112b, and the aperture of the third step 1112c is larger than the aperture of the second step 1112b. The fourth step 1112d is connected to the third step 1112c, and the aperture of the fourth step 1112d is larger than the aperture of the third step 1112c. The protective sheet 116 is fixed on the top surface of the third step 1112c, and the side of the protective sheet 116 abuts against the side of the fourth step 1112d. With the above structure, when installing the protective sheet 116, the protective sheet 116 is set on the top surface of the third step 1112c, so that the side of the protective sheet 116 abuts against the side of the fourth step 1112d, which is convenient for positioning the protective sheet 116 and improving the assembly efficiency. The back of the protective sheet 116 is glued and pasted on the top surface of the third step 1112c.

[0099] Please refer to Figure 5 , the top surface of the protection sheet 116 is flush with the top surface of the fourth step 1112d. With this structure, it is not only easy to judge whether the protection sheet 116 is installed in place, but also can prevent the protection sheet 116 from being scratched by other structures.

[0100] Please refer to Figure 5 and Fig. 9 , a frame groove 11214 is provided on the main body sheet 1121, the frame groove 11214 is located below the pressure relief hole 1112, the exhaust hole 11212 is provided at the bottom of the frame groove 11214, and the main body sheet 1121 is convex downward at the frame groove 11214. In the above structure, by providing the frame groove 11214 below the pressure relief hole 1112, it is possible to prevent the bracket 112 from hitting the explosion-proof valve 115, causing damage to the explosion-proof valve 115. At the same time, it is also possible to make the exhaust hole 11212 and the explosion-proof valve 115 have a certain distance to prevent the exhaust hole 11212 from being blocked, so that when the internal air pressure of the square battery is high, the gas can penetrate the exhaust hole 11212 to break through the explosion-proof valve 115. The main body sheet 1121 is convex downward at the frame groove 11214, which can make the main body sheet 1121 thinner, so as to reduce the weight of the bracket 112 and save materials.

[0101] Please refer to Figure 3 and Figure 7The upper cover 11 also includes a copper block 118, which can be preferably formed of copper or other hardware materials. A boss 1181 is provided on the upper surface of the copper block 118, and the boss 1181 is welded to the bottom surface of the pole piece 1131, and the area of ​​the boss 1181 is smaller than the area of ​​the bottom surface of the pole piece 1131. With this structure, the area of ​​the boss 1181 is small, which can reduce the contact area between the copper block 118 and the pole piece 1131, ensure the flatness of the copper block 118, make it more fit to the pole piece 1131, and facilitate welding. The welding of the boss 1181 and the pole piece 1131 can be performed by laser welding or friction welding.

[0102] Please refer to Figure 6 and Fig.10 , the side wall of the injection hole 1113 includes an inclined surface 1113a, a bearing surface 1113b and a limiting surface 1113c arranged in sequence along its axial direction. The inclined surface 1113a is close to the top surface of the cover plate 111 relative to the bearing surface 1113b, and the inclined surface 1113a is inclined to the central axis of the injection hole 1113. The aperture of the inclined surface 1113a gradually increases from the bottom surface of the cover plate 111 to the top surface of the cover plate 111. The bearing surface 1113b is perpendicular to the central axis of the injection hole 1113. The limiting surface 1113c is parallel to the central axis of the injection hole 1113, and a chamfer is provided on one end of the limiting surface 1113c close to the inclined surface 1113a. The sealing nail 117 includes a welding cap 1171 and an extension column 1172. The periphery of the welding cap 1171 abuts against the bearing surface 1113b. The extension column 1172 is connected to the center of the bottom surface of the welding cap 1171. The extension column 1172 is arranged in the inner cavity of the limiting surface 1113c and abuts against the limiting surface 1113c. The end of the extension column 1172 away from the welding cap 1171 is provided with a chamfer. When installing the sealing nail 117, the extension column 1172 is first placed in the inner cavity of the limiting surface 1113c, and the welding cap 1171 is abutted against the bearing surface 1113b. The radial direction of the sealing nail 117 is limited by the limiting surface 1113c, and the axial direction of the sealing nail 117 is limited by the bearing surface 1113b, and then the welding cap 1171 is welded to the side wall of the injection hole 1113. In the above structure, by setting the inclined surface 1113a, the electrolyte remaining on the cover plate 111 can flow into the injection hole 1113 to prevent the corrosion of the cover plate 111. By providing a chamfer at one end of the extension column 1172 away from the welding cap 1171 and providing a chamfer at one end of the limiting surface 1113c close to the inclined surface 1113a, it is convenient for the extension column 1172 to be inserted into the inner cavity of the limiting surface 1113c.

[0103] The processing process of the square battery of the first preferred embodiment of the utility model is as follows:

[0104] 1. Assemble the clamping ring 1122 in the clamping groove 1111b, so that the cover plate 111 and the bracket 112 are fixed together, and the pole 113 is inserted into the first through hole 1111a and the second through hole 11211. The cover plate 111, the bracket 112 and the pole 113 are stacked and assembled in sequence and placed on the injection mold jig. The injection mold jig, the bracket 112, the cover plate 111 and the pole 113 together form a closed injection cavity 119, and the glue is injected into the injection cavity 119 to form an injection molded part 114; through the first through hole The periphery of 1111a limits the first limiting ring 1141, so that the outer ring side of the injection molded part 114 is not easy to fall out; the second limiting ring 1142 is limited by the limiting groove 11321, so that the inner ring side of the injection molded part 114 is not easy to fall out; the third limiting ring 1143 is limited by the clamping ring 1122, so that the outer ring side of the injection molded part 114 is not easy to fall out; a sealing position is formed at the first groove 11322 and the second groove 1111c respectively to prevent burrs from being generated on the injection molded part 114;

[0105] 2. Place the periphery of the explosion-proof valve 115 in the hole surrounded by the second step 1112b, with the bottom surface of the periphery of the explosion-proof valve 115 abutting against the top surface of the first step 1112a, and the side surface of the periphery of the explosion-proof valve 115 abutting against the side surface of the second step 1112b, so as to position the explosion-proof valve 115, and then weld the periphery of the explosion-proof valve 115 to the second step 1112b, with the top surface of the second step 1112b serving as a welding reserved surface, so that the welding operation is convenient;

[0106] 3. Place the protective sheet 116 into the hole surrounded by the fourth step 1112d. The top surface of the third step 1112c limits the bottom surface of the protective sheet 116, and the side surface of the fourth step 1112d limits the side surface of the protective sheet 116, so that the protective sheet 116 can be positioned, and the peripheral bottom surface of the protective sheet 116 is bonded to the top surface of the third step 1112c.

[0107] 4. Install the pole core 13 into the inner cavity of the shell 12;

[0108] 5. Weld one pole ear 131 to the positive pole piece 1131, and weld the other pole ear 131 to the copper block 118. The welding method may be spot bottom welding, resistance welding, double needle welding, laser welding or other welding processes;

[0109] 6. Cover the upper cover 11 on the opening of the outer shell 12 and weld the two into one by laser welding;

[0110] 7. Inject electrolyte into the interior of the square battery through the injection hole 1113;

[0111] 8. Place the sealing pin 117 in the injection hole 1113 and weld the welding cap 1171 to the cover plate 111 .

[0112] This completes the processing of the square battery of the first preferred embodiment.

[0113] When processing the injection molded parts of the upper cover and square battery of the utility model, the bracket, cover plate and pole are stacked and assembled in sequence and then placed on an injection mold jig. The injection mold jig, the bracket, cover plate and pole together form a closed injection cavity, and glue is injected into the injection cavity to form the injection molded part. The bracket and the cover plate are matched and connected by the snap ring and the snap groove, so that the bracket and the cover plate are firmly connected together, which is convenient for injection molding. The first limiting ring is limited by the periphery of the first through hole, so that the outer ring side of the injection molded part is not easy to fall out, and the second limiting ring is limited by the limiting groove, so that the inner ring side of the injection molded part is not easy to fall out. The injection molded part is firmly fixed, and the sealing performance of the pole hole is improved. When installing the explosion-proof valve, first place the periphery of the explosion-proof valve in the hole surrounded by the second step, the bottom surface of the periphery of the explosion-proof valve abuts against the top surface of the first step, and the side surface of the periphery of the explosion-proof valve abuts against the side surface of the second step, so as to position the explosion-proof valve, and then weld the periphery of the explosion-proof valve to the second step. The top surface of the second step is used as a welding reserved surface, which makes the welding operation convenient and improves the processing efficiency and welding quality. A protective sheet is also provided on the outer layer of the explosion-proof valve. The pressure relief hole is doubly closed by the explosion-proof valve and the protective sheet, which can effectively improve the sealing performance at the pressure relief hole. The upper cover and square battery of the utility model improve the sealing performance of the hole structures such as the pole hole and the pressure relief hole on the upper cover through the structural design of the upper cover, thereby effectively reducing the risk of leakage of the square battery and improving the performance of the square battery.

[0114] Please refer to Fig.16 The second preferred embodiment of the utility model provides an upper cover. The upper cover of this embodiment is different from the upper cover of the first embodiment in the structure of the injection hole 211 and the sealing pin 22. The other parts can be the same as the first embodiment and will not be described here. Only the structure of the injection hole 211 and the sealing pin 22 is described in detail below.

[0115] The side wall of the injection hole 211 includes a cylindrical surface 2111, a first flow guide surface 2112, a straight surface 2113, and a second flow guide surface 2114 arranged in sequence along the axial direction thereof. The cylindrical surface 2111 is closer to the bottom surface of the cover plate 21 relative to the first flow guide surface 2112, the straight surface 2113 is perpendicular to the central axis of the injection hole 211, and the cylindrical surface 2111 is parallel to the central axis of the injection hole 211. The first flow guide surface 2112 and the second flow guide surface 2114 are inclined to the central axis of the injection hole 211, and the apertures of the first flow guide surface 2112 and the second flow guide surface 2114 gradually increase from the bottom surface of the cover plate 21 to the top surface of the cover plate 21, and the angles between the first flow guide surface 2112, the second flow guide surface 2114 and the central axis of the injection hole 211 increase in sequence. There is a smooth transition between the straight surface 2113 and the first guide surface 2112 , and between the second guide surface 2114 and the straight surface 2113 through arc surfaces.

[0116] The sealing nail 22 includes a nail cap 221, a nail column 222 and a hose 223. The periphery of the nail cap 221 is connected to the straight surface 2113 so that the central axis of the nail column 222 is parallel to the central axis of the injection hole 211. The nail cap 221 is welded to the side wall of the injection hole 211, so that the sealing nail 22 can be firmly positioned in the injection hole 211 without loosening, thereby effectively ensuring the sealing performance at the injection hole 211. The nail cap 221 can be welded to the straight surface 2113, or it can be welded to the arc surface between the straight surface 2113 and the second guide surface 2114. The nail cap 221 can be circumferentially welded so that the nail cap 221 is sealed with the injection hole 211 to improve the sealing performance; or, the nail cap 221 can be spot welded to only play a fixing role.

[0117] The nail column 222 is connected to the center of the bottom surface of the nail cap 221, and the nail column 222 is arranged in the inner cavity of the first guide surface 2112 and the cylindrical surface 2111. The rubber hose 223 is fixed to the nail column 222, and the rubber hose 223 is clamped between the cylindrical surface 2111 and the nail column 222. The end of the rubber hose 223 away from the nail cap 221 is provided with a trumpet-shaped expansion part 2231, and the outer diameter of the expansion part 2231 gradually increases from the end close to the nail cap 221 to the end away from the nail cap 221. The maximum outer diameter of the expansion part 2231 is smaller than the maximum aperture of the first guide surface 2112, and the expansion part 2231 abuts against the bottom edge of the cylindrical surface 2111.

[0118] The upper cover of this embodiment can make the electrolyte remaining on the cover plate 21 flow into the injection hole 211 through the inclined second guide surface 2114, and can easily limit the nail cap 221 through the straight surface 2113, and the nail column 222 through the cylindrical surface 2111. The gap between the cylindrical surface 2111 and the nail column 222 is filled by the rubber hose 223, which can improve the sealing performance and reduce the risk of leakage. The inclined first guide surface 2112 makes it easy for the electrolyte to flow from the straight surface 2113 to the cylindrical surface 2111. The aperture of the first guide surface 2112 has a large opening at the upper end and a small opening at the lower end, which also facilitates the nail column 222 to penetrate into the hole surrounded by the first guide surface 2112, so that it is easy to penetrate into the hole surrounded by the cylindrical surface 2111. The straight surface 2113 and the first guide surface 2112, and the second guide surface 2114 and the straight surface 2113 are smoothly transitioned through the arc surface, so that the electrolyte can flow smoothly at the connection between the straight surface 2113 and the first guide surface 2112, and at the connection between the second guide surface 2114 and the straight surface 2113, effectively avoiding the electrolyte from remaining at the connection. When the nail column 222 is inserted into the hole surrounded by the column surface 2111, the electrolyte on the first guide surface 2112 can be scraped to the bottom by the expansion part 2231. The maximum outer diameter of the expansion part 2231 is smaller than the maximum aperture of the first guide surface 2112, so that the expansion part 2231 can smoothly enter the hole surrounded by the first guide surface 2112.

[0119] The rubber tube 223 is fixed to the nail column 222, and the expansion part 2231 abuts against the bottom edge of the column 2111. With the above structure, the bottom edge of the column 2111 can limit the expansion part 2231 to prevent the rubber tube 223 from moving upward, thereby preventing the sealing nail 22 from being separated from the injection hole 211 during the assembly process, improving the sealing performance at the injection hole 211, and reducing the risk of leakage.

[0120] In this embodiment, the injection hole 211 is sealed by the rubber hose 223, and the nail cap 221 is circumferentially welded to achieve double sealing, improve the sealing effect, and reduce the risk of leakage. In other embodiments, the rubber hose 223 may not be provided, and the sealing is achieved by only the circumferential welding of the nail cap 221, and the nail column 222 and the cylindrical surface 2111 may be interference-fitted to improve the connection strength.

[0121] The bottom surface of the cover plate 21 is provided with a thickening platform, and the first guide surface 2112 and the column surface 2111 are both provided on the thickening platform. With the above structure, the thickening platform makes the cover plate 21 thicker locally, which is convenient for providing the first guide surface 2112 and the column surface 2111, and the other parts of the cover plate 21 are thinner, which can effectively reduce weight and save materials.

[0122] The side wall of the injection hole 211 also includes a third guide surface 2115, the third guide surface 2115 is connected to the second guide surface 2114, the third guide surface 2115 is closer to the top surface of the cover plate 21 relative to the second guide surface 2114, the third guide surface 2115 is inclined to the central axis of the injection hole 211, the aperture of the third guide surface 2115 gradually increases from the bottom surface of the cover plate 21 to the top surface of the cover plate 21, and the angle between the third guide surface 2115 and the central axis of the injection hole 211 is greater than the angle between the second guide surface 2114 and the central axis of the injection hole 211. With the above structure, the third guide surface 2115 is an inclined surface, which facilitates the residual electrolyte to flow into the injection hole 211. The angle between the third guide surface 2115 and the central axis of the injection hole 211 is greater than the angle between the second guide surface 2114 and the central axis of the injection hole 211, which can further expand the upper aperture of the injection hole 211 to collect more residual electrolyte.

[0123] The connection between the third guide surface 2115 and the second guide surface 2114 is smoothly transitioned through an arc surface. With this structure, the electrolyte can flow smoothly at the connection between the third guide surface 2115 and the second guide surface 2114, effectively avoiding the electrolyte from remaining at the connection between the two.

[0124] To sum up, although the present invention has been disclosed as above in the form of preferred embodiments, the protection scope of the present invention is not limited thereto, and any technician familiar with the technical field can make equivalent substitutions or changes within the technical scope disclosed by the present invention according to the concept of the technical solution of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A cover, characterized in that: include: A cover plate, which is provided with a pole hole, a pressure relief hole and a liquid injection hole, wherein the pole hole includes a first through hole and a clamping groove arranged along the thickness direction of the cover plate, the clamping groove is connected to the bottom surface of the cover plate, the clamping groove is connected to the first through hole, and the clamping groove is annular and arranged around the first through hole; the side wall of the pressure relief hole includes a first step and a second step arranged in sequence along the thickness direction of the cover plate, the first step and the second step are both annular, the aperture of the second step is larger than the aperture of the first step, and the first step is closer to the bottom surface of the cover plate relative to the second step; A bracket, comprising a main body sheet and a clamping ring; the main body sheet abuts against the bottom of the cover plate and is provided with a second through hole, an exhaust hole and a liquid inlet hole, the exhaust hole is located below the pressure relief hole, the liquid inlet hole is coaxially arranged with the liquid injection hole, the clamping ring is connected to the top surface of the main body sheet and is coaxially arranged with the second through hole, the clamping ring is arranged in the clamping groove, and the side wall of the first through hole is close to the central axis of the first through hole relative to the inner side surface of the clamping ring; A pole, comprising a pole piece and a protruding column, wherein the top surface of the pole piece abuts against the bottom surface of the main body piece, the protruding column protrudes from the top surface of the pole piece and is penetrated through the first through hole and the second through hole, the protruding column is spaced apart from the cover plate and the bracket, an annular limiting groove is provided along the circumference of one end of the protruding column close to the pole piece, and a threaded hole is provided at one end of the protruding column away from the pole piece; An injection molded part, which is annular, is injection molded between the pole, the cover plate and the bracket, a first limiting ring is arranged on the outer side of the ring of the injection molded part along its circumference, the first limiting ring is filled in the inner cavity of the clamping ring, the periphery of the first through hole is clamped between the upper part of the injection molded part and the first limiting ring, a second limiting ring is arranged on the inner side of the ring of the injection molded part along its circumference, and the second limiting ring is filled in the limiting groove; an explosion-proof valve, the outer periphery of which is arranged in the hole surrounded by the second step, the bottom surface of the outer periphery of the explosion-proof valve abuts against the top surface of the first step, and the outer periphery of the explosion-proof valve is welded to the second step; a protective sheet covering the pressure relief hole, the protective sheet being located on a side of the second step away from the first step, the explosion-proof valve being spaced apart from the protective sheet; and, A sealing pin is arranged in the liquid injection hole.

2. The upper cover according to claim 1, characterized in that: The side wall of the second through hole is away from the central axis of the second through hole relative to the inner wall of the clamping ring, and a third limiting ring is arranged along the circumference of the outer side surface of the ring of the injection molded part, and the third limiting ring is filled in the second through hole, and the clamping ring is clamped between the third limiting ring and the periphery of the first through hole.

3. The upper cover according to claim 1, characterized in that: A first groove is provided along the circumference of one end of the protrusion away from the pole piece; a first convex ring is provided on the top surface of the injection molded part, and the top surface of the first convex ring is flush with the bottom side wall of the first groove; The pole hole also includes a second groove, which is annular and arranged around the first through hole. The second groove is connected to the top surface of the cover plate and is connected to the first through hole. The outer side surface of the ring of the injection molded part is provided with a second convex ring along its circumference, and the second convex ring is filled in the second groove.

4. The upper cover according to claim 3, characterized in that: A third through hole is arranged at the periphery of the first through hole, and the third through hole is connected to the second groove and the clamping groove; the injection molded part is provided with a connecting column, which is arranged in the third through hole, and the connecting column connects the second convex ring and the first limiting ring.

5. The upper cover according to claim 1, characterized in that: The side wall of the pressure relief hole is further provided with an annular third step and a fourth step along its axial direction, the third step is connected to the second step, the aperture of the third step is larger than the aperture of the second step, the fourth step is connected to the third step, the aperture of the fourth step is larger than the aperture of the third step; the protective sheet is fixed on the top surface of the third step, and the side surface of the protective sheet is abutted against the side surface of the fourth step.

6. The upper cover according to claim 1, characterized in that: The main body sheet is provided with a frame groove, the frame groove is located below the pressure relief hole, the exhaust hole is provided at the bottom of the frame groove, and the main body sheet is convex downward at the frame groove.

7. The upper cover according to claim 1, characterized in that: The side wall of the injection hole comprises an inclined surface, a bearing surface and a limiting surface arranged in sequence along the axial direction thereof; the inclined surface is closer to the top surface of the cover plate relative to the bearing surface, the inclined surface is inclined to the central axis of the injection hole, and the aperture of the inclined surface gradually increases from the bottom surface of the cover plate to the top surface of the cover plate; the bearing surface is perpendicular to the central axis of the injection hole; the limiting surface is parallel to the central axis of the injection hole, and a chamfer is provided at one end of the limiting surface close to the inclined surface; The sealing pin includes a welding cap and an extension column; the periphery of the welding cap abuts against the bearing surface; the extension column is connected to the center of the bottom surface of the welding cap, the extension column passes through the inner cavity of the limiting surface and abuts against the limiting surface, and the end of the extension column away from the welding cap is provided with a chamfer.

8. The upper cover according to claim 1, characterized in that: The side wall of the injection hole comprises a cylindrical surface, a first flow guide surface, a straight surface, and a second flow guide surface which are sequentially arranged along the axial direction thereof, the first flow guide surface is closer to the bottom surface of the cover plate relative to the straight surface, the straight surface is perpendicular to the central axis of the injection hole, the cylindrical surface is parallel to the central axis of the injection hole, the first flow guide surface and the second flow guide surface are inclined to the central axis of the injection hole, the apertures of the first flow guide surface and the second flow guide surface gradually increase from the bottom surface of the cover plate to the top surface of the cover plate, and the angles between the first flow guide surface, the second flow guide surface and the central axis of the injection hole increase sequentially; the straight surface and the first flow guide surface, and the second flow guide surface and the straight surface are both smoothly transitioned through arc surfaces; The sealing nail includes a nail cap, a nail column and a rubber hose; the periphery of the nail cap abuts against the straight surface, and the nail cap is welded to the side wall of the injection hole; the nail column is connected to the center of the bottom surface of the nail cap, and the nail column is penetrated through the first guide surface and the inner cavity of the cylindrical surface; the rubber hose is fixed to the nail column, and the rubber hose is clamped between the cylindrical surface and the nail column.

9. The upper cover according to claim 8, characterized in that: A trumpet-shaped expansion portion is provided at one end of the rubber hose away from the nail cap, and the outer diameter of the expansion portion gradually increases from the end close to the nail cap to the end away from the nail cap. The maximum outer diameter of the expansion portion is smaller than the maximum aperture of the first guide surface, and the expansion portion abuts against the bottom edge of the cylinder.

10. A square battery, characterized in that: include: The upper cover according to any one of claims 1 to 9, wherein the bracket further comprises two supporting structures, which are respectively connected to the two ends of the bottom surface of the main body sheet, the supporting structure comprises a first plate and a plurality of second plates, the first plate and the plurality of second plates are both perpendicular to the bottom surface connected to the main body sheet, the first plate is in the shape of a straight strip, which extends along the width direction of the main body sheet, and the plurality of second plates are arranged along the width direction of the main body sheet and are perpendicularly connected to the first plate; a housing having an open end connected to an edge of the cover plate; and The pole core is arranged between the shell and the upper cover, the support structure is in contact with the pole core, and the pole core is provided with a pole ear, which is welded to the pole piece.

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