Battery cover plate and battery

Abstract

The battery cover plate comprises a cover plate body, a mounting structure and a pole, the cover plate body is provided with a pole mounting hole, the pole is provided with a cylindrical pole table part, the pole is mounted in the pole mounting hole through the mounting structure, and the pole is provided with a circular welding hole penetrating through the pole. According to the battery cover plate, the post platform part of the post is in the cylinder shape, which is equivalent to a traditional square post, and when the battery cover plate is processed based on a lathe, the circular post does not need to be further processed into the square and cylindrical post platform part, so that the waste of processing materials can be reduced. According to the application, the circular welding hole is formed in the pole, and when the cylindrical punching table is formed by punching on the switching piece, the side wall of the circular welding hole and the cylindrical punching table of the switching piece can be welded, so that the welding position of the switching piece and the pole is located in the middle of the pole, and the waste of battery space caused by welding of the switching piece and the pole can be reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cover and a battery. Background Art

[0002] The existing square single battery usually includes a shell, a cover plate and a battery cell. The cover plate is provided with a pole, and the pole lug of the battery cell is charged and discharged through the pole. The process of installing the pole on the cover plate currently mainly includes riveting, injection molding, welding, and minimalist pole.

[0003] CN107221632A discloses a battery structure, wherein a pole is provided on a shell cover, and the pole (5) is provided with a pole connecting hole (5a) corresponding to the pole ear (3), and the pole ear (3) extends into the pole connecting hole (5a) on the pole (5), and the pole ear (3) and the pole (5) are connected together by a stir friction welding process. However, in the above-mentioned battery structure, the pole is square in structure, and the pole is usually processed by lathe. The square pole will be further processed into a square on the circular pole, which will increase the waste of materials and increase the cost. On the other hand, the existing battery core usually adopts multiple pole ears, and the multiple pole ears are usually prepared by the pole piece die cutting process. If the pole ear is reserved too long, the waste of pole piece foil will also increase. In addition, the welding method of folding the pole ear to the outside of the cover plate will also increase the thickness of the cover plate after connection, increase the waste of space, and is not conducive to the technical direction of improving energy density. Utility Model Content

[0004] Based on this, it is necessary to provide a battery cover and a battery that can reduce material waste, reduce costs, and reduce space waste.

[0005] In the first aspect, the present application provides a battery cover, including a cover body, a mounting structure and a pole, the cover body is provided with a pole mounting hole, the pole has a column base portion in the shape of a cylinder, the pole is mounted in the pole mounting hole through the mounting structure, and the pole is provided with a circular welding hole penetrating the pole. The pole of the present application is mounted in the pole mounting hole of the cover body through the mounting structure, including but not limited to a plastic injection molding solution, a riveting solution, a metal pressure plate welding solution, and a minimalist pole welding solution.

[0006] Taking the metal pressure plate welding scheme as an example, in one embodiment, the mounting structure includes a metal pressure plate, an upper injection molded part, a sealing ring and a lower insulating part, the pole includes a column base portion and an anti-twist mounting portion connected to each other, the column base portion is provided with a circular welding hole, the cover body has a first surface facing the battery cell and a second surface away from the battery cell, the cover body is provided with a first anti-twist groove around the pole mounting hole on the first surface, the lower insulating part is installed in the first anti-twist groove, and the lower insulating part is provided with a second anti-twist groove on the side away from the cover body. The lower insulating member is provided with a first through hole in the second anti-twist groove, the anti-twist mounting portion is installed in the second anti-twist groove, the upper injection molded member is provided with a second through hole, the metal pressure plate is provided with a pole exposure hole, the column base portion passes through the first through hole, the pole mounting hole, the second through hole and is welded to the metal pressure plate, the upper injection molded member is located between the metal pressure plate and the second surface of the cover body, the sealing ring is placed outside the column base portion and is pressed tightly between the groove wall of the first anti-twist groove and the anti-twist mounting portion.

[0007] In one embodiment, the cover body is provided with two circular pole mounting holes, the number of the poles and the number of the mounting structures are both two, and the two poles are respectively mounted in the pole mounting holes through one mounting structure.

[0008] In one embodiment, a battery cover includes a cover body, two mounting structures and two poles, the cover body is provided with two circular pole mounting holes, the two poles are respectively installed in the pole mounting holes through the mounting structures, the mounting structure includes a metal pressure plate, an upper injection molded part, a sealing ring and a lower insulating part, the pole includes a column base portion and an anti-twist mounting portion connected to each other, the column base portion is in the shape of a cylinder, the column base portion is provided with a circular welding hole, the cover body has a first surface facing the battery cell and a second surface away from the battery cell, the cover body is provided with a first anti-twist groove around the pole mounting hole on the first surface, and the lower insulating mounting portion is provided with a sealing ring. Installed in the first anti-twist groove, the lower insulating member is provided with a second anti-twist groove on the side away from the cover body, the lower insulating member is provided with a first through hole in the second anti-twist groove, the anti-twist mounting portion is installed in the second anti-twist groove, the upper injection molded member is provided with a second through hole, the metal pressure plate is provided with a pole exposure hole, the column base portion passes through the first through hole, the pole mounting hole, the second through hole and is welded to the metal pressure plate, the upper injection molded member is located between the metal pressure plate and the second surface of the cover body, the sealing ring is placed outside the column base portion and is pressed tightly between the groove wall of the first anti-twist groove and the anti-twist mounting portion.

[0009] In one embodiment, the diameter of the circular welding hole is greater than 5 mm;

[0010] And / or, the thickness of the side wall behind the circular welding hole formed in the column base is greater than 0.8 mm.

[0011] In one embodiment, the first anti-twist groove has a rectangular cross section;

[0012] The second anti-twist groove has a rectangular cross section;

[0013] The anti-twist mounting portion matches the shape of the second anti-twist groove.

[0014] In one of the embodiments, the upper injection molded part is provided with a receiving groove around the second through hole on a surface away from the cover body, the receiving groove is communicated with the second through hole, and the metal pressure plate is installed in the receiving groove.

[0015] In one embodiment, the thickness of the metal pressing plate is greater than the depth of the receiving groove.

[0016] In one of the embodiments, the metal pressure plate is provided with a sealing groove around the pole exposure hole on a surface away from the cover plate body, the sealing groove is communicated with the pole exposure hole, the groove wall of the sealing groove is an L-shaped groove structure, the groove wall of the sealing groove has opposite side walls and a bottom wall, the end of the column base away from the anti-twist mounting portion is flush with the bottom wall of the sealing groove, and the end of the column base away from the anti-twist mounting portion is welded to the bottom wall of the sealing groove.

[0017] In one embodiment, the two poles are respectively a positive pole and a negative pole, the positive pole is a copper pole, the negative pole is an aluminum pole, the metal pressure plate of the mounting structure corresponding to the negative pole is an aluminum pressure plate, and the metal pressure plate of the mounting structure corresponding to the positive pole is a copper-aluminum composite pressure plate, the copper-aluminum composite pressure plate includes an aluminum pressure plate and a copper pressure plate connected to each other, the copper pressure plate is located on a side close to the cover plate body, the aluminum pressure plate is located on a side away from the cover plate body, and the copper pressure plate is welded to the positive pole.

[0018] In one embodiment, the positive electrode column and the negative electrode column are respectively installed at opposite ends of the cover body, and the cover body is further provided with an explosion-proof hole and a liquid injection hole between the positive electrode column and the negative electrode column, and an explosion-proof plate is installed on the explosion-proof hole.

[0019] In a second aspect, the present application provides a battery, comprising a battery cover as described in any of the above embodiments.

[0020] In one embodiment, the metal pressing plate is welded with a sealing aluminum sheet on a side away from the cover plate body for sealing and plugging the circular welding hole;

[0021] In one embodiment, the battery further includes a shell, an adapter and a battery cell, the pole ears of the battery cell are connected to the adapter, a cylindrical punch is stamped on the adapter, the cylindrical punch is accommodated in the circular welding hole and is welded to the side wall of the circular welding hole on the side of the circular welding hole away from the battery cell.

[0022] The battery cover plate, by making the column platform of the pole present a cylindrical shape, is equivalent to the traditional square pole. When it is processed on a lathe, there is no need to further process the circular pole into a square shape. The cylindrical column platform can reduce the waste of processing materials. Moreover, when the cylindrical column platform of the present application is assembled with the circular pole mounting hole on the cover body, the assembly process is simpler and more convenient than the square hole assembly process. The present application opens a circular welding hole on the pole, and when the cylindrical punching platform is formed by stamping on the adapter, it can be used to weld the side wall of the circular welding hole with the cylindrical punching platform of the adapter, so that the welding position of the adapter and the pole is located in the middle of the pole, which can reduce the waste of battery space caused by welding the adapter and the pole. Moreover, the circular welding hole is a through-hole structure, and it can also be welded on the outside of the cover body, that is, the outside of the cover body through the circular welding hole to the side wall of the circular welding hole. In the automated assembly engineering of the battery, the assembly process is simplified, and the folding steps in the welding of the battery cover and the adapter are reduced, which is convenient for improving production efficiency, thereby further reducing costs. In addition, the circular welding hole can further reduce the use of pole materials and further reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is an exploded view of a battery cover according to an embodiment;

[0024] Figure 2 A schematic structural diagram of a cover plate body of a battery cover plate according to an embodiment;

[0025] Figure 3 This is a schematic structural diagram of a battery cover according to an embodiment;

[0026] Figure 4 This is a schematic structural diagram of a battery cover according to an embodiment;

[0027] Figure 5 A partial cross-sectional view of a battery cover at a pole position according to an embodiment;

[0028] Figure 6 A schematic structural diagram of a battery adapter of an embodiment;

[0029] Illustrations: 100, cover body; 110, pole mounting hole; 120, first anti-twist groove; 130, explosion-proof hole; 140, injection hole; 100a, second side; 100b, first side; 210, metal pressure plate; 211, pole exposure hole; 212, sealing groove; 2121, side wall of sealing groove; 2122, bottom wall of sealing groove; 220, upper injection molded part; 221, second through hole; 222, accommodating groove; 230, sealing ring; 240, lower insulating part; 241, second anti-twist groove; 2411, first through hole; 242, anti-twist protrusion; 300, pole; 310, column base; 311, circular welding hole; 320, anti-twist mounting part; 400, sealing aluminum sheet; 500, adapter sheet; 510, cylindrical punching platform. DETAILED DESCRIPTION

[0030] In order to facilitate the understanding of the present application, in order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application, and the preferred implementation methods of the present application are given in the accompanying drawings. However, the present application can be implemented in many different forms and is not limited to the implementation methods described herein. On the contrary, the purpose of providing these implementation methods is to make the disclosure of the present application more thoroughly and comprehensively understood. The present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited to the specific embodiments disclosed below. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. In the description of the present application, the meaning of "several" is at least one, such as one, two, etc., unless otherwise clearly and specifically defined. It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may also be a centered element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be a centered element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of this application. The terms used herein are only for the purpose of describing specific implementation methods and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0031] In the first aspect, the present application provides a battery cover, see Figures 1 to 5The battery cover includes a cover body 100, two mounting structures and two poles 300. The cover body 100 is provided with two circular pole mounting holes 110, that is, the pole mounting holes 110 have a circular cross section. The two poles 300 are respectively installed in the pole mounting holes 110 through the mounting structures. The mounting structures include a metal pressure plate 210, an upper injection molded part 220, a sealing ring 230 and a lower insulating part 240. The pole 300 includes a connected column base 310 and an anti-twist mounting part 320. The column base 310 is in the shape of a cylinder, or in other words, the column base has a circular cross section. The column base 310 is provided with a circular welding hole 311. The side wall of the circular welding hole 311 is used for welding the pole ear or the adapter, so that the welding connection position of the pole is accommodated in the internal space of the pole, reducing the waste of height space caused by welding. The cover body 100 has a first surface 100b facing the battery cell and a second surface 100a facing away from the battery cell. The cover body 100 has a first anti-twist groove 120 on the first surface around the pole mounting hole 110. The lower insulating member 240 is installed in the first anti-twist groove 120. The lower insulating member 240 has a second anti-twist groove 241 on the side away from the cover body. The lower insulating member 240 has a first through hole 2411 in the second anti-twist groove 241. The anti-twist mounting portion 320 is installed in the second anti-twist groove 241. The anti-twist mounting portion, the second anti-twist groove and the first anti-twist mounting groove are installed to prevent the pole from twisting. In specific applications, a circular shape can provide a better anti-twist effect. Please continue to refer to Figure 1 and Figure 4 The upper injection molded part 220 is provided with a second through hole 221, the metal pressure plate 210 is provided with a pole exposure hole 211, the column base part 310 passes through the first through hole 2411, the pole mounting hole 110, the second through hole 221 and is welded to the metal pressure plate 210, and the pole is fixedly installed in the pole mounting hole by welding the metal pressure plate and the pole. The upper injection molded part 220 is located between the metal pressure plate 210 and the second surface of the cover body 100, and the sealing ring 230 is sleeved outside the column base part 310 and is pressed between the groove wall of the first anti-twist groove 120 and the anti-twist mounting part 320. For example, the second anti-twist groove 241 of the lower insulating part 240 forms an anti-twist protrusion 242 on the other surface of the lower insulating part 240, and the anti-twist protrusion 242 is installed in the first anti-twist groove 120.

[0032] The above-mentioned battery cover plate, by making the column base portion 310 of the pole 300 present a cylindrical shape, is equivalent to a traditional square pole. When based on lathe processing, there is no need to further process the circular pole into a square shape. The cylindrical column base portion 310 can reduce the waste of processing materials. Moreover, when the cylindrical column base portion 310 of the present application is assembled with the circular pole mounting hole 110 on the cover plate body, the assembly process is simpler and more convenient than the square hole assembly process. The present application opens a circular welding hole 311 on the pole, and cooperates with the stamping of the cylindrical punching platform on the adapter. Please combine Figure 6 , can be used to weld the side wall of the circular welding hole 311 with the cylindrical punch 510 of the adapter 500, so that the welding position of the adapter 500 and the pole 300 is located in the middle of the pole 300, which can reduce the waste of battery space caused by the welding of the adapter 500 and the pole 300. Moreover, the circular welding hole 311 is a through-hole structure, and can also be welded on the outside of the cover body 100 at the second surface 100a, that is, on the outside of the cover body through the circular welding hole 311. The side wall of the circular welding hole 311 simplifies the assembly process in the automated assembly engineering of the battery, reduces the folding steps in the welding of the battery cover and the adapter, and is convenient to improve production efficiency, thereby further reducing costs. In addition, the circular circular welding hole 311 can further reduce the use of pole materials and further reduce costs.

[0033] In one embodiment, please combine Figure 1 and Figure 4 The diameter of the circular welding hole 311 is greater than 5 mm; for example, the thickness of the side wall of the circular welding hole of the column base 310 is greater than 0.8 mm. In this way, the welding firmness between the column base and the metal pressure plate can be improved, and the subsequent welding of the side wall of the circular welding hole of the column base and the adapter sheet can also be facilitated.

[0034] In one embodiment, the first anti-twist groove 120 has a rectangular cross section; for example, the second anti-twist groove 241 has a rectangular cross section; the anti-twist mounting portion 320 matches the shape of the second anti-twist groove 241. In this way, the anti-twist performance of the pole can be improved, and the assembly process is more convenient.

[0035] In one embodiment, the upper injection molded part 220 is provided with a receiving groove 222 around the second through hole 221 on a surface away from the cover body, the receiving groove 222 is communicated with the second through hole 221, and the metal pressing plate 210 is installed in the receiving groove 222. In this way, by providing the receiving groove, it is possible to facilitate the assembly and positioning of the metal pressing plate, and the overall height of the cover can be further reduced.

[0036] In one embodiment, the thickness of the metal pressing plate 210 is greater than the depth of the receiving groove 222. In this way, it is convenient to connect the metal pressing plate to an external bus bar or the like.

[0037] In one embodiment, the metal pressure plate 210 is provided with a sealing groove 212 around the pole exposure hole 211 on a surface away from the cover plate body 100, the sealing groove 212 is connected with the pole exposure hole 211, the groove wall of the sealing groove 212 is an L-shaped groove structure, the groove wall of the sealing groove 212 has opposite side walls 2121 and a bottom wall 2122, the end of the column away from the anti-twist mounting part is flush with the bottom wall of the sealing groove, and the end of the column away from the anti-twist mounting part is welded to the bottom wall of the sealing groove. In this way, by providing a sealing groove, a sealing aluminum sheet can be welded to the side wall 2121 of the sealing groove after the pole and the adapter are welded, which can further improve the sealing performance at the pole position and reduce or avoid leakage problems.

[0038] In one embodiment, the two poles 300 are respectively a positive pole and a negative pole, the positive pole is a copper pole, the negative pole is an aluminum pole, the metal pressure plate of the mounting structure corresponding to the negative pole is an aluminum pressure plate, and the metal pressure plate of the mounting structure corresponding to the positive pole is a copper-aluminum composite pressure plate, the copper-aluminum composite pressure plate includes an aluminum pressure plate and a copper pressure plate connected to each other, the copper pressure plate is located on the side close to the cover body, the aluminum pressure plate is located on the side away from the cover body, and the copper pressure plate is welded to the positive pole. In this way, by using a composite pressure plate, it is convenient to maintain the welding performance of the aluminum pressure plate and the sealing aluminum sheet on the top, and the copper pressure plate below can ensure the welding performance with the copper pole.

[0039] In one embodiment, the positive electrode column and the negative electrode column are respectively installed at opposite ends of the cover body, and the cover body is also equipped with an explosion-proof hole 130 and an injection hole 140 between the positive electrode column and the negative electrode column. An explosion-proof plate is installed on the explosion-proof hole 130, and the injection hole 140 is subsequently used for welding aluminum nails or aluminum sheets after injection.

[0040] The battery cover plate mentioned above makes the column base 310 of the pole 300 into a cylindrical shape, which is equivalent to a traditional square pole. When it is processed on a lathe, there is no need to further process the circular pole into a square shape. The cylindrical column base 310 can reduce the waste of processing materials. Moreover, when the cylindrical column base 310 of the present application is assembled with the circular pole mounting hole 110 on the cover plate, the assembly process is simpler and more convenient than the square hole assembly process. The present application opens a circular welding hole 311 on the pole, and cooperates with the stamping of the cylindrical punching platform on the adapter. Please combine Figure 6, which can be used to weld the side wall of the circular welding hole 311 with the cylindrical punch 510 of the adapter 500, so that the welding position of the adapter 500 and the pole 300 is located in the middle of the pole 300, which can reduce the waste of battery space caused by the welding of the adapter 500 and the pole 300. Moreover, the circular welding hole 311 is a through-hole structure, and can also be welded on the outside of the cover plate 100 at the second surface 100a, that is, the side wall of the circular welding hole 311 can be welded through the circular welding hole 311 on the outside of the cover plate. In the automated assembly engineering of the battery, the assembly process is simplified, the folding steps in the welding of the battery cover plate and the adapter are reduced, and the production efficiency is improved, thereby further reducing the cost. In addition, the circular circular welding hole 311 can further reduce the use of pole materials and further reduce costs.

[0041] In a second aspect, the present application provides a battery, comprising a battery cover as described in any of the above embodiments.

[0042] In one embodiment, please continue to refer to 1 to Figure 5 The metal pressing plate 210 is also welded with a sealing aluminum sheet 400 for sealing and plugging the circular welding hole on one side away from the cover plate body 100; in this way, the sealing performance of the pole can be improved after the adapter plate is welded to the pole.

[0043] In one embodiment, the battery further includes a housing, an adapter and a battery cell, wherein the tab of the battery cell is connected to the adapter, see Figure 6 A cylindrical punching platform 510 is punched on the adapter sheet 500 , and the cylindrical punching platform 510 is accommodated in the circular welding hole 311 and welded to the side wall of the circular welding hole 311 with the column platform portion 310 at the side of the circular welding hole 311 away from the battery core.

[0044] The battery cover plate, by making the column platform of the pole present a cylindrical shape, is equivalent to the traditional square pole. When it is processed on a lathe, there is no need to further process the circular pole into a square shape. The cylindrical column platform can reduce the waste of processing materials. Moreover, when the cylindrical column platform of the present application is assembled with the circular pole mounting hole on the cover body, the assembly process is simpler and more convenient than the square hole assembly process. The present application opens a circular welding hole on the pole, and when the cylindrical punching platform is formed by stamping on the adapter, it can be used to weld the side wall of the circular welding hole with the cylindrical punching platform of the adapter, so that the welding position of the adapter and the pole is located in the middle of the pole, which can reduce the waste of battery space caused by welding the adapter and the pole. Moreover, the circular welding hole is a through-hole structure, and it can also be welded on the outside of the cover body, that is, on the outside of the cover, through the circular welding hole to weld the adapter and the side wall of the circular welding hole. In the automated assembly engineering of the battery, the assembly process is simplified, and the folding steps in the welding of the battery cover and the adapter are reduced, which is convenient for improving production efficiency, thereby further reducing costs. In addition, the circular welding hole can further reduce the use of pole materials and further reduce costs.

[0045] The technical features of the above-described embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the technical features in the above-described embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification. It should be noted that "in one embodiment", "for example", "for example", etc. in this application are intended to illustrate the present application, rather than to limit the present application. The above-described embodiments only express several implementation methods of the present application, and the description is relatively specific and detailed, but it cannot be understood as a limitation on the scope of the patent application. It should be pointed out that for a person of ordinary skill in the art, without departing from the concept of the present application, several variations and improvements can also be made, which all belong to the scope of protection of the present application. Therefore, the scope of protection of the patent in this application shall be subject to the attached claims.

Claims

1. A battery cover, characterized in that: The invention comprises a cover body, a mounting structure and a pole, wherein the cover body is provided with a pole mounting hole, the pole has a column base portion in a cylindrical shape, the pole is mounted in the pole mounting hole through the mounting structure, and the pole is provided with a circular welding hole penetrating the pole.

2. The battery cover according to claim 1, characterized in that: The mounting structure comprises a metal pressing plate, an upper injection molding, a sealing ring and a lower insulating member, the pole comprises a column platform portion and an anti-twist mounting portion connected to each other, the column platform portion is provided with a circular welding hole, the cover body has a first surface facing the battery cell and a second surface away from the battery cell, the cover body is provided with a first anti-twist groove around the pole mounting hole on the first surface, the lower insulating member is installed in the first anti-twist groove, the lower insulating member is provided with a second anti-twist groove on a side away from the cover body, the lower insulating member is provided with a first through hole in the second anti-twist groove, the anti-twist mounting portion is installed in the second anti-twist groove, the upper injection molding is provided with a second through hole, the metal pressing plate is provided with a pole exposure hole, the column platform portion passes through the first through hole, the pole mounting hole, the second through hole and is welded to the metal pressing plate, the upper injection molding is located between the metal pressing plate and the second surface of the cover body, the sealing ring is placed outside the column platform portion and is pressed tightly between the groove wall of the first anti-twist groove and the anti-twist mounting portion.

3. The battery cover according to claim 2, characterized in that: The cover body is provided with two circular pole mounting holes, the number of the poles and the mounting structures are both two, and the two poles are respectively mounted in the pole mounting holes through one mounting structure; And / or, the diameter of the circular welding hole is greater than 5 mm; and / or, the thickness of the side wall behind the circular welding hole provided in the column base portion is greater than 0.8 mm; and / or, the first anti-twist groove has a rectangular cross section; The second anti-twist groove has a rectangular cross section; The anti-twist mounting portion matches the shape of the second anti-twist groove.

4. The battery cover according to claim 3, characterized in that: The upper injection molded part is provided with a receiving groove around the second through hole on a surface away from the cover plate body, the receiving groove is communicated with the second through hole, and the metal pressing plate is installed in the receiving groove.

5. The battery cover according to claim 4, characterized in that: The thickness of the metal pressing plate is greater than the depth of the accommodating groove.

6. The battery cover according to claim 2, characterized in that: The metal pressure plate is provided with a sealing groove around the pole exposure hole on a surface away from the cover plate body, the sealing groove is communicated with the pole exposure hole, the groove wall of the sealing groove is an L-shaped groove structure, the groove wall of the sealing groove has opposite side walls and a bottom wall, the end of the column base away from the anti-twist mounting portion is flush with the bottom wall of the sealing groove, and the end of the column base away from the anti-twist mounting portion is welded to the bottom wall of the sealing groove.

7. The battery cover according to claim 6, characterized in that: The two poles are respectively a positive pole and a negative pole, the positive pole is a copper pole, the negative pole is an aluminum pole, the metal pressure plate of the mounting structure corresponding to the negative pole is an aluminum pressure plate, and the metal pressure plate of the mounting structure corresponding to the positive pole is a copper-aluminum composite pressure plate, the copper-aluminum composite pressure plate includes an aluminum pressure plate and a copper pressure plate connected to each other, the copper pressure plate is located on the side close to the cover plate body, the aluminum pressure plate is located on the side away from the cover plate body, and the copper pressure plate is welded to the positive pole.

8. The battery cover according to claim 7, characterized in that: The positive pole and the negative pole are respectively installed at two opposite ends of the cover body. The cover body is further provided with an explosion-proof hole and a liquid injection hole between the positive pole and the negative pole. An explosion-proof sheet is installed on the explosion-proof hole.

9. A battery, characterized in that: The invention comprises a battery cover as claimed in any one of claims 1 to 8.

10. The battery according to claim 9, characterized in that A sealing aluminum sheet for sealing and plugging the circular welding hole is welded and sealed on a side of the metal pressing plate away from the cover plate body; And / or, the battery also includes a shell, an adapter and a battery cell, the pole ears of the battery cell are connected to the adapter, a cylindrical punch is stamped on the adapter, the cylindrical punch is accommodated in the circular welding hole and is welded to the side wall of the circular welding hole on the side of the circular welding hole away from the battery cell.

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