Top cover structure of square battery and square battery

Abstract

The utility model provides a top cover structure of a square battery and the square battery. The top cover structure of the square battery comprises a cover plate, a bracket, a pole and an injection molding piece, the cover plate is provided with a pole hole, the pole hole comprises a clamping groove, a first through hole and a first groove, the first groove is communicated with the top surface of the cover plate, and the clamping groove is communicated with the bottom surface of the cover plate. The support comprises a main body piece and a clamping ring, the main body piece is provided with a second through hole, and the clamping ring is arranged in the clamping groove. The pole column comprises a pole piece and a convex column; the protruding column penetrates through the first through hole and the second through hole, and the protruding column, the cover plate and the support are arranged at intervals. The injection molding part is annular, the injection molding part is arranged among the pole, the cover plate and the support in an injection molding mode, a first convex ring is arranged on the annular outer side of the injection molding part in the circumferential direction of the injection molding part, the first convex ring is arranged in the first groove, and the upper surface of the first convex ring is flush with the top face of the cover plate. According to the top cover structure of the square battery and the square battery disclosed by the utility model, burrs can be prevented from being generated on the annular outer side of the injection molding part, and subsequent processing procedures are increased.

Description

Technical Field

[0001] The utility model relates to the technical field of square batteries, in particular to a top cover structure of a square battery 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 structure and a shell. The top cover structure includes a cover plate, a bracket, a pole and an injection molded part. The cover plate and the bracket are stacked, the cover plate is located above the bracket, the pole is inserted through the cover plate and the bracket, and the injection molded part is arranged between the pole, the cover plate and the bracket. During processing, the cover plate, the bracket and the pole are placed in a mold of a plastic part, and the glue is injected to form an injection molded part. The structure of the cover plate makes it easy for the injection molded part to form burrs during injection molding, which increases the subsequent processing steps.

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

[0005] The utility model provides a top cover structure of a square battery and a square battery, which can avoid burrs on the outer side of a ring of an injection molded part and increase the subsequent processing procedures.

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

[0007] A top cover structure of a square battery, comprising:

[0008] A cover plate, which is provided with a pole hole, wherein the pole hole includes a clamping groove, a first through hole and a first groove which are sequentially arranged along the thickness direction of the cover plate, and the three are connected, the clamping groove and the first groove are both annularly arranged around the first through hole, the first groove is connected to the top surface of the cover plate, and the clamping groove is connected to the bottom surface of the cover plate;

[0009] A bracket, comprising a main body sheet and a clamping ring, wherein the main body sheet is provided with a second through hole, the clamping ring is connected to the top surface of the main body sheet and is coaxially arranged with the second through hole, and the clamping ring is arranged in the clamping groove;

[0010] A pole, comprising a pole piece and a convex column; the top surface of the pole piece abuts against the bottom surface of the main body piece; the convex column is connected to the top surface of the pole piece and penetrates the first through hole and the second through hole, and the convex column is spaced apart from the cover plate and the bracket; and,

[0011] The injection molded part is annular and is injection molded between the pole, the cover plate and the bracket. A first convex ring is arranged on the outer side of the ring of the injection molded part along its circumference. The first convex ring is arranged in the first groove, and the upper surface of the first convex ring is flush with the top surface of the cover plate.

[0012] In the top cover structure of the square battery described in the utility model, a second groove is provided along the circumference of the end of the convex column away from the pole piece, and a second convex ring is provided at the end of the injection molded part away from the pole piece, and the top surface of the second convex ring is flush with the lower side wall of the second groove.

[0013] In the top cover structure of the square battery described in the utility model, an annular limiting groove is arranged along the circumference of one end of the convex column close to the pole piece, and a first limiting ring is arranged along the circumference of the inner side surface of the injection molded part, and the first limiting ring is arranged in the limiting groove.

[0014] In the top cover structure of the square battery described in the utility model, the upper side wall of the limiting groove is away from the pole piece relative to the top surface of the cover plate.

[0015] In the top cover structure of the square battery described in the utility model, 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, and the outer side surface of the injection molded part is provided with a second limiting ring along its circumference, and the second limiting ring is filled in the inner cavity of the clamping ring, and the periphery of the first through hole is clamped between the first convex ring and the second limiting ring.

[0016] In the top cover structure of the square battery 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 side wall of the clamping ring, and a third limiting ring is arranged along the circumference of the outer side surface 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.

[0017] In the top cover structure of the square battery described in the utility model, a plurality of third through holes are also arranged on the cover plate, which surround the first through hole, and the third through holes are connected to the first groove and the clamping groove, and the injection molded part also includes a plurality of connecting columns, and the plurality of connecting columns are respectively arranged in the plurality of third through holes, and the connecting columns connect the second limiting ring and the first convex ring.

[0018] In the top cover structure of the square battery described in the utility model, the main body sheet is provided with an exhaust hole; the cover plate is provided with a pressure relief hole, the pressure relief hole is provided above the exhaust hole, and the side wall of the pressure relief hole includes a first step, a second step, a third step and a fourth step which are arranged in sequence and whose apertures gradually increase along the axial direction, and the first step is closer to the exhaust hole than the second step;

[0019] The top cover structure of the square battery also includes an explosion-proof valve and a protective sheet. The explosion-proof valve is arranged 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 periphery of the explosion-proof valve is welded to the second step; the protective sheet is arranged on the top surface of the third step, the side surface of the protective sheet abuts against the side surface of the fourth step, and the explosion-proof valve and the protective sheet are arranged at intervals.

[0020] In the top cover structure of the square battery described in the utility model, the main body sheet is provided with a avoidance groove, the exhaust hole is located at the bottom of the avoidance groove, and the main body sheet is convex downward at the avoidance groove.

[0021] Another technical solution of the utility model is:

[0022] A square battery, comprising:

[0023] The top cover structure of the above-mentioned square battery; and

[0024] The outer shell has a top cover structure of the square battery disposed at an opening of the outer shell.

[0025] Compared with the prior art, the utility model has the following beneficial effects: during processing, the top cover structure and square battery of the square battery of the utility model are stacked and placed on the injection mold jig, and the injection mold jig, the cover plate, the bracket and the pole together form a closed injection cavity, and the glue is injected into the injection cavity to form an injection molded part. During injection molding, the injection mold jig overlaps the top surface of the cover plate and extends toward the square of the first groove. The glue flows into the first groove to form a first convex ring. After sealing, the glue will not form overflow glue at the junction of the injection mold jig and the cover plate, avoiding burrs on the injection molded part at this location, and reducing the subsequent process of processing burrs. At the same time, the cover plate and the bracket are connected by a snap-in groove and a snap-in ring, so that the positions of the two can be relatively fixed, which is convenient for injection molding. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] 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.

[0027] Figure 1This is a schematic diagram of the overall structure of a square battery provided in a preferred embodiment of the utility model.

[0028] Figure 2 A partial cross-sectional schematic diagram of a square battery provided in a preferred embodiment of the utility model.

[0029] Figure 3 for Figure 2 Schematic diagram of the enlarged structure of part A.

[0030] Figure 4 for Figure 2 Schematic diagram of the enlarged structure of part B.

[0031] Figure 5 Another partial cross-sectional schematic diagram of a square battery provided in a preferred embodiment of the utility model.

[0032] Figure 6 for Figure 5 Schematic diagram of the enlarged structure of part C.

[0033] Figure 7 A schematic diagram of the front structure of the cover plate of the top cover structure provided in the preferred embodiment of the utility model.

[0034] Figure 8 A schematic diagram of the reverse structure of the cover plate of the top cover structure provided in the preferred embodiment of the utility model.

[0035] Fig. 9 A schematic structural diagram of a bracket of a top cover structure provided in a preferred embodiment of the utility model.

[0036] in,

[0037] 1. The top cover structure of the square battery,

[0038] 11. Cover plate,

[0039] 111, pole hole, 1111, clamping groove, 1112, first through hole, 1113, first groove,

[0040] 112. The third through hole,

[0041] 113, pressure relief hole, 1131, first step, 1132, second step, 1133, third step, 1134, fourth step,

[0042] 12. Bracket,

[0043] 121, main body piece, 1211, second through hole, 1212, exhaust hole, 1213, avoidance groove,

[0044] 122. Clamp ring,

[0045] 13. Pole,

[0046] 131. Pole piece,

[0047] 132, convex column, 1321, second groove, 1322, limiting groove,

[0048] 14. Injection molded part, 141. First convex ring, 142. Second convex ring, 143. First limiting ring, 144. Second limiting ring, 145. Third limiting ring,

[0049] 15. Explosion-proof valve,

[0050] 16. Protective film,

[0051] 2. Shell.

[0052] In the figures, structurally similar elements are denoted by the same reference numerals. DETAILED DESCRIPTION

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] The square battery in the prior art usually includes a top cover structure and a shell. The top cover structure includes a cover plate, a bracket, a pole and an injection molded part. The cover plate and the bracket are stacked, the cover plate is located above the bracket, the pole is inserted through the cover plate and the bracket, and the injection molded part is arranged between the pole, the cover plate and the bracket. During processing, the cover plate, the bracket and the pole are placed in a mold of a plastic part, and the glue is injected to form an injection molded part. The structure of the cover plate makes it easy for the injection molded part to form burrs during injection molding, which increases the subsequent processing steps.

[0058] The following is a preferred embodiment of a square battery provided by the present invention that can solve the above technical problems.

[0059] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Fig. 9 The preferred embodiment of the utility model provides a square battery, which includes a square battery top cover structure 1 and a shell 2. The square battery top cover structure 1 is arranged at the opening of the shell 2. The shell 2 is preferably made of aluminum alloy or other hardware materials.

[0060] The top cover structure 1 of the square battery includes a cover plate 11, a bracket 12, a pole 13 and an injection molded part 14. The cover plate 11 is preferably made of aluminum alloy or other hardware materials. The cover plate 11 is provided with a pole hole 111, and the pole hole 111 includes a snap-in groove 1111, a first through hole 1112 and a first groove 1113 arranged in sequence along the thickness direction of the cover plate 11, and the three are connected. The snap-in groove 1111 and the first groove 1113 are both annularly arranged around the first through hole 1112, and the first groove 1113 is connected to the top surface of the cover plate 11, and the snap-in groove 1111 is connected to the bottom surface of the cover plate 11. The bracket 12 is preferably made of plastic materials such as PP or PE. The bracket 12 includes a main body sheet 121 and a snap ring 122. The main body sheet 121 is provided with a second through hole 1211. The snap ring 122 is connected to the top surface of the main body sheet 121 and is coaxially arranged with the second through hole 1211. The snap ring 122 is arranged in the snap groove 1111. There are two poles 13, one positive and one negative. The pole 13 is preferably made of aluminum alloy or other hardware materials. The pole 13 includes a pole piece 131 and a boss 132. The top surface of the pole piece 131 abuts against the bottom surface of the main body sheet 121. The boss 132 is connected to the top surface of the pole piece 131, and is penetrated through the first through hole 1112 and the second through hole 1211. The boss 132 is spaced apart from the cover plate 11 and the bracket 12. The injection molded part 14 is preferably made of plastic materials such as PP or PE. The injection molded part 14 is annular and is injected between the pole 13, the cover plate 11 and the bracket 12. A first convex ring 141 is provided along its circumference on the outer side of the ring of the injection molded part 14. The first convex ring 141 is provided in the first groove 1113. The upper surface of the first convex ring 141 is flush with the top surface of the cover plate 11. In this embodiment, there are two pole holes 111, two second through holes 1211 and two clamping rings 122.

[0061] During processing of the top cover structure 1 of the square battery and the square battery of the utility model, the cover plate 11, the bracket 12 and the pole 13 are stacked and placed on the injection mold jig. The injection mold jig, the cover plate 11, the bracket 12 and the pole 13 together form a closed injection cavity, and the glue is injected into the injection cavity to form the injection molded part 14. During injection molding, the injection mold jig overlaps the top surface of the cover plate 11 and extends toward the square of the first groove 1113. The glue flows into the first groove 1113 to form a first convex ring 141. After sealing, the glue will not form overflow glue at the junction of the injection mold jig and the cover plate 11, avoiding the injection molded part 14 from generating burrs there, thereby reducing the subsequent process of processing the burrs. At the same time, the cover plate 11 and the bracket 12 are connected by the snap-in groove 1111 and the snap-in ring 122, so that the positions of the two can be relatively fixed, which is convenient for injection molding.

[0062] Please refer to Figure 3 and Figure 6, an L-shaped second groove 1321 is provided along the circumference of the end of the convex column 132 away from the pole piece 131, and a second convex ring 142 is provided at the end of the injection molded part 14 away from the pole piece 131, and the top surface of the second convex ring 142 is flush with the lower side wall of the second groove 1321. With this structure, during injection molding, the injection mold jig overlaps the lower bottom surface of the second groove 1321, and after sealing, the glue will not overflow at the junction of the injection mold jig and the convex column 132, thereby avoiding burrs on the injection molded part 14 at this location, and reducing the subsequent process of processing the burrs.

[0063] Please continue to refer to Figure 3 and Figure 6 The end of the protrusion 132 close to the pole piece 131 is provided with an annular limiting groove 1322 along its circumference, and the inner side surface of the injection molded part 14 is provided with a first limiting ring 143 along its circumference, and the first limiting ring 143 is arranged in the limiting groove 1322. With this structure, the first limiting ring 143 is limited by the limiting groove 1322, so that the injection molded part 14 can be prevented from slipping out to the outside.

[0064] Please refer to Figure 6 , the upper side wall of the limiting groove 1322 is away from the pole piece 131 relative to the top surface of the cover plate 11. With this structure, the upper side wall of the limiting groove 1322 is higher than the top surface of the cover plate 11, which facilitates the inflow of the injection liquid during injection molding.

[0065] Please refer to Figure 3 and Figure 6 , the side wall of the first through hole 1112 is close to the central axis of the first through hole 1112 relative to the inner side of the clamping ring 122, and the outer side of the ring of the injection molded part 14 is provided with a second limiting ring 144 along its circumference, and the second limiting ring 144 is filled in the inner cavity of the clamping ring 122, and the periphery of the first through hole 1112 is clamped between the first convex ring 141 and the second limiting ring 144. With this structure, the second limiting ring 144 is limited by the periphery of the first through hole 1112, which can further prevent the injection molded part 14 from slipping out.

[0066] Please refer to Figure 3 and Figure 6 , the side wall of the second through hole 1211 is away from the central axis of the second through hole 1211 relative to the side wall of the clamping ring 122, and the outer side surface of the injection molded part 14 is provided with a third limiting ring 145 along its circumference, the third limiting ring 145 is filled in the second through hole 1211, and the clamping ring 122 is clamped between the third limiting ring 145 and the periphery of the first through hole 1112. With this structure, the third limiting ring 145 is limited by the clamping ring 122, which can further prevent the injection molded part 14 from slipping out to the outside.

[0067] Please refer to Figure 3 , Figure 7 and Figure 8The cover plate 11 is also provided with a plurality of third through holes 112, which surround the first through hole 1112, and the third through holes 112 are connected to the first groove 1113 and the clamping groove 1111. The injection molded part 14 also includes a plurality of connecting columns, which are respectively provided in the plurality of third through holes 112, and the connecting columns connect the second limiting ring 144 and the first convex ring 141. With this structure, the glue flows into the third through holes 112 to form connecting columns, and the connecting columns connect the second limiting ring 144 and the first convex ring 141, so that the injection molded part 14 is fixed more stably.

[0068] Please refer to Figure 4 , an exhaust hole 1212 is provided on the main body sheet 121. A pressure relief hole 113 is provided on the cover plate 11, and the pressure relief hole 113 is arranged above the exhaust hole 1212. The side wall of the pressure relief hole 113 includes a first step 1131, a second step 1132, a third step 1133 and a fourth step 1134 arranged in sequence and with gradually increasing apertures along its axial direction, and the first step 1131 is closer to the exhaust hole 1212 relative to the second step 1132. The top cover structure 1 of the square battery also includes an explosion-proof valve 15 and a protective sheet 16. The explosion-proof valve 15 is arranged in the hole surrounded by the second step 1132, the peripheral bottom surface of the explosion-proof valve 15 abuts against the top surface of the first step 1131, and the periphery of the explosion-proof valve 15 is welded to the second step 1132. The protective sheet 16 is arranged on the top surface of the third step 1133, the side of the protective sheet 16 abuts against the side of the fourth step 1134, and the explosion-proof valve 15 and the protective sheet 16 are arranged at intervals. With the above structure, when installing the explosion-proof valve 15, the periphery of the explosion-proof valve 15 is placed on the top surface of the first step 1131, and the side of the periphery of the explosion-proof valve 15 abuts against the side of the second step 1132, which is convenient for positioning the explosion-proof valve 15. The top surface of the second step 1132 is used as a welding reserved surface, which is convenient for welding the periphery of the explosion-proof valve 15 and the second step 1132. The top surface of the periphery of the explosion-proof valve 15 is flush with the top surface of the second step 1132, making welding more convenient. When installing the protective sheet 16, the protective sheet 16 is arranged on the top surface of the third step 1133, so that the side of the protective sheet 16 abuts against the side of the fourth step 1134, which is convenient for positioning the protective sheet 16 and improving assembly efficiency. The protection sheet 16 is preferably made of plastic material such as PP or PE.

[0069] The back edge of the protection sheet 16 is glued and adhered to the top surface of the third step 1133. With this structure, the protection sheet 16 is easily fixed.

[0070] Please refer to Figure 4The main body sheet 121 is provided with a avoidance groove 1213, and the exhaust hole 1212 is located at the bottom of the avoidance groove 1213. The main body sheet 121 is convex downward at the avoidance groove 1213. With this structure, the bottom of the avoidance groove 1213 is spaced apart from the explosion-proof valve 15, which can prevent the bottom of the avoidance groove 1213 from blocking the explosion-proof valve 15. When the internal gas pressure of the battery is high, the explosion-proof valve 15 will not crack, and at the same time, the main body sheet 121 can be prevented from hitting the explosion-proof valve 15, causing damage to the explosion-proof valve 15.

[0071] The assembly process of the square battery of the preferred embodiment of the utility model is as follows:

[0072] 1. Assemble the clamping ring 122 in the clamping groove 1111 to fix the cover plate 11 and the bracket 12 together, insert the pole 13 into the first through hole 1112 and the second through hole 1211, and stack and assemble the cover plate 11, the bracket 12 and the pole 13 and place them together on the injection mold jig, inject glue into the gap between the pole 13 and the cover plate 11 and the bracket 12 to form the injection molded part 14; form a sealing position at the first groove 1113 and the second groove 1321 to prevent burrs from being generated on the injection molded part 14;

[0073] 2. Place the explosion-proof valve 15 on the top surface of the first step 1131, with the side of the explosion-proof valve 15 abutting against the side of the second step 1132, and weld the periphery of the explosion-proof valve 15 to the second step 1132; fix the protection sheet 16 on the top surface of the third step 1133, with the side of the protection sheet 16 abutting against the side of the fourth step 1134;

[0074] 3. Assemble the top cover structure 1 of the square battery to the opening of the outer shell 2.

[0075] This completes the assembly process of the square battery of this preferred embodiment.

[0076] The top cover structure of the square battery and the square battery of the utility model, during processing, the cover plate, bracket and pole are stacked and placed on the injection mold jig, and the injection mold jig, the cover plate, bracket and pole together form a closed injection cavity, and glue is injected into the injection cavity to form an injection molded part. During injection molding, the injection mold jig overlaps the top surface of the cover plate and extends toward the square of the first groove. The glue flows into the first groove to form a first convex ring. After sealing, the glue will not form overflow glue at the junction of the injection mold jig and the cover plate, avoiding burrs on the injection molded part at this location, and reducing the subsequent process of processing the burrs. At the same time, the cover plate and the bracket are connected by a snap-in groove and a snap-in ring, so that the positions of the two can be relatively fixed, which is convenient for injection molding.

[0077] 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 top cover structure of a square battery, characterized in that: include: A cover plate, which is provided with a pole hole, wherein the pole hole includes a clamping groove, a first through hole and a first groove which are sequentially arranged along the thickness direction of the cover plate, and the three are connected, the clamping groove and the first groove are both annularly arranged around the first through hole, the first groove is connected to the top surface of the cover plate, and the clamping groove is connected to the bottom surface of the cover plate; A bracket, comprising a main body sheet and a clamping ring, wherein the main body sheet is provided with a second through hole, the clamping ring is connected to the top surface of the main body sheet and is coaxially arranged with the second through hole, and the clamping ring is arranged in the clamping groove; A pole, comprising a pole piece and a convex column; the top surface of the pole piece abuts against the bottom surface of the main body piece; the convex column is connected to the top surface of the pole piece and penetrates the first through hole and the second through hole, and the convex column is spaced apart from the cover plate and the bracket; and, The injection molded part is annular and is injection molded between the pole, the cover plate and the bracket. A first convex ring is arranged on the outer side of the ring of the injection molded part along its circumference. The first convex ring is arranged in the first groove, and the upper surface of the first convex ring is flush with the top surface of the cover plate.

2. The top cover structure of the square battery according to claim 1, characterized in that: A second groove is provided along the circumference of one end of the protrusion away from the pole piece, and a second convex ring is provided at one end of the injection molded part away from the pole piece, and the top surface of the second convex ring is flush with the lower side wall of the second groove.

3. The top cover structure of the square battery according to claim 1 or 2, characterized in that: An annular limiting groove is arranged along the circumference of one end of the protruding column close to the pole piece, and a first limiting ring is arranged along the circumference of the inner side surface of the injection molded part, and the first limiting ring is arranged in the limiting groove.

4. The top cover structure of the square battery according to claim 3, characterized in that: The upper side wall of the limiting groove is away from the pole piece relative to the top surface of the cover plate.

5. The top cover structure of the square battery according to claim 3, characterized in that: 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, and a second limiting ring is arranged along the circumference of the outer side surface of the injection molded part, and the second limiting ring is filled in the inner cavity of the clamping ring, and the periphery of the first through hole is clamped between the first convex ring and the second limiting ring.

6. The top cover structure of the square battery according to claim 5, 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 side wall of the clamping ring, and a third limiting ring is arranged along the circumference of the outer side surface 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.

7. The top cover structure of the square battery according to claim 5, characterized in that: The cover plate is also provided with a plurality of third through holes surrounding the first through holes, the third through holes connecting the first groove and the snap-in groove, the injection molded part also includes a plurality of connecting columns, the plurality of connecting columns are respectively arranged in the plurality of third through holes, the connecting columns connect the second limiting ring and the first convex ring.

8. The top cover structure of the square battery according to claim 1, characterized in that: The main body sheet is provided with an exhaust hole; the cover plate is provided with a pressure relief hole, the pressure relief hole is provided above the exhaust hole, and the side wall of the pressure relief hole includes a first step, a second step, a third step and a fourth step which are arranged in sequence and have gradually increasing apertures along the axial direction thereof, and the first step is closer to the exhaust hole than the second step; The top cover structure of the square battery also includes an explosion-proof valve and a protective sheet. The explosion-proof valve is arranged 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 periphery of the explosion-proof valve is welded to the second step; the protective sheet is arranged on the top surface of the third step, the side surface of the protective sheet abuts against the side surface of the fourth step, and the explosion-proof valve and the protective sheet are arranged at intervals.

9. The top cover structure of the square battery according to claim 8, characterized in that: The main body sheet is provided with a avoidance groove, the exhaust hole is located at the bottom of the avoidance groove, and the main body sheet is convex downward at the avoidance groove.

10. A square battery, characterized in that: include: The top cover structure of the square battery according to any one of claims 1 to 9; as well as, The outer shell has a top cover structure of the square battery disposed at an opening of the outer shell.

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