Battery cover plate and secondary battery

Abstract

The utility model provides a battery cover plate and a secondary battery, and relates to the technical field of batteries. The battery cover plate comprises a base plate, an insulating block and a pole, the base plate comprises a plate body and two mounting grooves, a first liquid injection hole is formed in the plate body in a penetrating manner, the two mounting grooves are oppositely formed in one side of the plate body, and the mounting grooves protrude relative to the plate body; the insulating block is arranged on the side, away from the mounting groove, of the plate body, a second liquid injection hole is formed in the insulating block in a penetrating mode, and the second liquid injection hole and the first liquid injection hole are coaxially formed; the number of the pole columns is two, and the two pole columns are installed in the two installation grooves respectively. According to the invention, redundant electrolyte can be prevented from entering the gap between the pole and the substrate, and the problem of electrochemical corrosion of the cover plate caused by electrolyte pollution is improved.

Description

Technical Field

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

[0002] During the battery production process, multiple injections are required. During the injection, electrolyte spraying often occurs. The sprayed electrolyte will flow through the cover plate into the gap between the insulating pad on the pole and the substrate. The electrolyte that enters the gap is difficult to clean, and the electrolyte remains in the gap, causing the negative electrode pressure plate to be conductive with the aluminum shell, and the side voltage on the negative electrode side is too low, which eventually leads to corrosion of the aluminum shell and cover plate, battery leakage, and safety risks. To this end, a battery cover plate and a secondary battery are provided. Utility Model Content

[0003] In view of this, the purpose of the present application is to provide a battery cover and a secondary battery, aiming to solve the technical problem in the prior art that when the battery is injected, the electrolyte overflows and remains, causing corrosion.

[0004] To achieve the above objectives, the technical solutions adopted in this application are as follows:

[0005] In a first aspect, an embodiment of the present application provides a battery cover, comprising:

[0006] A base plate, the base plate comprising a plate body and a mounting groove, the plate body being provided with a first injection hole, two mounting grooves being provided, the two mounting grooves being arranged opposite to each other on one side of the plate body, and the mounting grooves being protruding relative to the plate body;

[0007] An insulating block, the insulating block is arranged on a side of the plate body away from the mounting groove, the insulating block is penetrated by a second liquid injection hole, and the second liquid injection hole is coaxially arranged with the first liquid injection hole;

[0008] A pole, wherein two poles are provided, and the two poles are respectively installed in the two installation grooves.

[0009] In one of the embodiments of the first aspect, the pole includes a pressure plate, a separator pad and a rivet, the substrate is penetrated by a first through hole located in the mounting groove, the insulating block is penetrated by a second through hole coaxially arranged with the first through hole, the pressure plate is penetrated by a third through hole, the separator pad is penetrated by a fourth through hole, and the separator pad is embedded in the mounting groove, a receiving groove is provided on the side of the separator pad away from the mounting groove, the pressure plate is embedded in the receiving groove, the rivet passes through the first through hole, the second through hole, the third through hole and the fourth through hole in sequence, and the rivet is welded to the pressure plate.

[0010] In one of the embodiments of the first aspect, a positioning groove is provided on the side of the insulating block facing away from the substrate, the rivet includes a cap portion and a shaft portion, one end of the shaft portion is connected to the cap portion, an end of the shaft portion away from the cap portion passes through the substrate, and the cap portion is embedded in the positioning groove.

[0011] In one embodiment of the first aspect, the positioning groove has a plurality of corners, the plurality of corners are provided with first rounded corners, and at least two of the first rounded corners have different radii;

[0012] A plurality of second rounded corners are provided on the circumferential side of the cap portion. The second rounded corners are arranged corresponding to the first rounded corners, and the radii of the correspondingly arranged first rounded corners and the second rounded corners are the same.

[0013] In one embodiment of the first aspect, the substrate is provided with a plurality of positioning holes along the circumference of the first through hole, and every two positioning holes arranged opposite to each other form a positioning group, and the spacings between two positioning holes in different positioning groups are different;

[0014] A plurality of positioning pins are provided on one side of the separation pad that is attached to the substrate, and the positioning pins penetrate the positioning holes.

[0015] In one embodiment of the first aspect, the diameters of the positioning holes in different positioning groups are different, and the outer diameter of the positioning pin is adapted to the diameter of the corresponding positioning hole.

[0016] In one embodiment of the first aspect, a sealing sleeve is provided around the rivet, and the sealing sleeve is inserted through the third through hole.

[0017] In one of the embodiments of the first aspect, an extended edge portion is circumferentially provided on the open side of the installation groove, and the extended edge portion extends toward the outside of the installation groove.

[0018] In one of the embodiments of the first aspect, an explosion-proof hole is formed through the substrate, and a dustproof sticker and an explosion-proof sheet are respectively provided on both sides of the explosion-proof hole.

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

[0020] Compared with the prior art, the beneficial effects of the present application are as follows: the present application provides a battery cover and a secondary battery, which can be used for liquid injection protection of the battery. The battery cover includes a substrate, an insulating block and a pole, wherein a first liquid injection hole is provided through the substrate, and two mounting grooves which are integral with the plate body and higher than the plane of the plate body are provided on one side of the substrate, the insulating block is provided on the side of the substrate away from the mounting groove, and a second liquid injection hole is provided which is coaxially arranged with the first liquid injection hole, and two poles are provided and respectively installed in the two mounting grooves. In this way, during the liquid injection process of the battery, electrolyte is injected into the battery from the first liquid injection hole and the second liquid injection hole. Due to the setting of the mounting groove, the pole is enclosed and protected by the mounting groove, thereby preventing excess electrolyte from entering the gap between the pole and the substrate, and improving the problem that the cover is easily corroded by the electrolyte. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A schematic diagram of the exploded structure of a battery cover in some embodiments of the present application is shown;

[0023] Figure 2 The structure of the substrate in some embodiments of the present application is shown in FIG. Figure 1 ;

[0024] Figure 3 The structure of the substrate in some embodiments of the present application is shown in FIG. Figure 2 ;

[0025] Figure 4 The structure of the substrate in some embodiments of the present application is shown in FIG. Figure 3 ;

[0026] Figure 5 The structure of the separator pad in some embodiments of the present application is shown. Figure 1 ;

[0027] Figure 6 The structure of the separator pad in some embodiments of the present application is shown. Figure 2 ;

[0028] Figure 7 The structure of the separator pad in some embodiments of the present application is shown. Figure 3 ;

[0029] Figure 8 It shows a schematic diagram of the structure of the pressing plate in some embodiments of the present application;

[0030] Fig. 9 A schematic diagram of the structure of a rivet in some embodiments of the present application is shown;

[0031] Fig.10 The structure of the insulating block in some embodiments of the present application is shown. Figure 1 ;

[0032] Fig.11 The structure of the insulating block in some embodiments of the present application is shown. Figure 2 ;

[0033] Fig.12 A schematic structural diagram of a sealing sleeve in some embodiments of the present application is shown.

[0034] Description of main component symbols:

[0035] 100-battery cover; 110-base plate; 111-plate body; 1111-first injection hole; 1112-first through hole; 1113-positioning hole; 1114-explosion-proof hole; 112-mounting groove; 1121-extended edge; 120-insulating block; 121-second through hole; 122-second injection hole; 123-positioning groove; 124-corner; R1-first fillet; 130-pole; 131-pressing plate; 1311-third through hole; 132-separating pad; 1321-accommodating groove; 1322-fourth through hole; 1323-positioning pin; 133-rivet; 1331-shaft; 1332-cap; R2-second fillet; 134-sealing sleeve; 1341-flange edge; 1342-sleeve body; 140-dustproof sticker; 150-explosion-proof plate. DETAILED DESCRIPTION

[0036] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0037] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0038] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0039] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" 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 this application can be understood according to specific circumstances.

[0040] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0041] Rechargeable battery, also known as rechargeable battery or storage battery, refers to a battery that can be used continuously by recharging the active material after the battery is discharged. Secondary batteries represented by lithium-ion batteries and sodium-ion batteries are widely used in the field of energy storage and power batteries due to their high energy density, long cycle life, and low manufacturing cost. According to the appearance, batteries can be divided into square aluminum shell batteries, cylindrical steel shell batteries, and soft pack batteries. Among them, square aluminum shell batteries occupy a major position in the energy storage and power market due to their advantages such as large space utilization and simple process during assembly.

[0042] The structural parts of the square aluminum shell battery include an aluminum shell and a cover plate. The cover plate includes positive and negative electrode pressure plates, which are generally made of metals such as aluminum or copper. The pressure plate is connected to the winding core inside the battery through the pole. In the prior art, a plastic insulating pad is often added between the pressure plate and the substrate to achieve insulation between the negative electrode pressure plate and the substrate, but there is an inevitable gap between the plastic insulating pad and the aluminum substrate of the cover plate. As a result, during the battery filling process, the ejected electrolyte is likely to flow into the gap between the insulating pad and the substrate, causing the pressure plate to be conductive with the aluminum shell, and the negative electrode side voltage is too low, which ultimately leads to corrosion of the aluminum shell and the cover plate, battery leakage, and safety risks.

[0043] In addition, in order to increase the voltage on the negative side, the plastic pad between the positive pressure plate and the cover aluminum substrate can be a weakly conductive plastic, that is, the positive pressure plate and the cover aluminum substrate can be in a weakly conductive state. However, this will cause the positive and negative plastic pads to be installed in reverse, and the positive weakly conductive plastic pad will be installed in the negative electrode, resulting in too low voltage on the negative side, causing the battery shell to be corroded. At the same time, in lithium-ion batteries, the positive pole column is generally made of aluminum, and the negative pole column is generally made of copper. During the assembly process of the cover, if the positive and negative poles are installed in reverse, it will also cause corrosion problems inside the battery.

[0044] To improve the above problems, the embodiment of the present application provides a battery cover 100, which can be used for the anti-corrosion design of secondary batteries. The battery cover 100 provided by the present application can prevent excess electrolyte from entering the gap between the pole 130 and the substrate 110, thereby improving the problem that the cover is easily corroded by the electrolyte.

[0045] like Figure 1 As shown, the battery cover 100 includes a substrate 110, an insulating block 120 and a pole 130, wherein the substrate 110 includes a plate body 111 and a mounting groove 112, the plate body 111 is penetrated with a first liquid injection hole 1111, and two mounting grooves 112 are provided, the two mounting grooves 112 are relatively arranged on one side of the plate body 111, and the mounting grooves 112 protrude relative to the plate body 111; the insulating block 120 is arranged on the side of the plate body 111 away from the mounting groove 112, the insulating block 120 is penetrated with a second liquid injection hole 122, and the second liquid injection hole 122 is coaxially arranged with the first liquid injection hole 1111; there are two poles 130, and the two poles 130 are respectively installed in the two mounting grooves 112.

[0046] Combined Figure 2 As shown, Figure 2 1 is an isometric view of the substrate 110. For example, the first injection hole 1111 is disposed in the middle of the substrate 110. The substrate 110 may be an aluminum plate, and the substrate 110 is composed of a plate body 111 and a mounting groove 112. The substrate 110 and the mounting groove 112 may be an integrated design. Of course, in other embodiments, the plate body 111 and the mounting groove 112 may also be a separate design, and then assembled and welded into an integral structure.

[0047] Combined Fig.10 As shown, the insulating block 120 is used to connect the battery cover 100 to the battery aluminum shell, the second injection hole 122 penetrates the insulating block 120, and the first injection hole 1111 penetrates the substrate 110, so as to communicate with the inside of the battery through the first injection hole 1111 and the second injection hole 122. Since the pole 130 is installed in the mounting groove 112, the electrolyte will not overflow to the pole 130 during the injection process, so as to prevent excess electrolyte from entering the gap between the pole 130 and the substrate 110, thereby improving the problem that the cover is easily corroded by the electrolyte.

[0048] like Figure 1 In some embodiments, the pole 130 includes a pressing plate 131, a separating pad 132 and a rivet 133, the substrate 110 is penetrated by a first through hole 1112 located in the mounting groove 112, the insulating block 120 is penetrated by a second through hole 121 coaxially arranged with the first through hole 1112, the pressing plate 131 is penetrated by a third through hole 1311, the separating pad 132 is penetrated by a fourth through hole 1322, and the separating pad 132 is embedded in the mounting groove 112, and a receiving groove 1321 is provided on the side of the separating pad 132 away from the mounting groove 112, the pressing plate 131 is embedded in the receiving groove 1321, and the rivet 133 is penetrated by the first through hole 1112, the second through hole 121, the third through hole 1311 and the fourth through hole 1322 in sequence.

[0049] Combined Figure 5 and Figure 8 As shown, illustratively, after the rivet 133 passes through the insulating block 120 and the separator 132 in sequence, the separator 132 is perfectly engaged with the notch of the mounting groove 112, so that the rivet 133 is installed in the mounting groove 112. The side of the separator 132 facing away from the substrate 110 is exposed to the environment, and a receiving groove 1321 is provided on this side, and the pressing plate 131 is engaged in the receiving groove 1321, so that the pressing plate 131 is isolated from the substrate 110 by the separator 132. Two separators 132 are provided, and the two separators 132 are respectively located in the two mounting grooves 112, and the separator 132 is provided with a fourth through hole 1322 for the rivet 133 to pass through, so as to protect the positive and negative electrodes of the battery.

[0050] The pressing plate 131 can be a rectangular metal sheet, and a third through hole 1311 is opened in the middle of the pressing plate 131. The separator 132 is embedded in the installation groove 112. At the same time, the pressing plate 131 is also embedded in the receiving groove 1321 of the separator 132 to limit the end of the rivet 133, thereby conductively isolating the pole 130 from the substrate 110.

[0051] It should be noted that the two separators 132 located at the positive and negative electrodes of the battery can have completely the same structure and size, and can be made of insulating plastic materials. However, in other embodiments, the separator 132 located at the positive electrode can be made of weakly conductive material.

[0052] Combination Fig. 9 and Fig.11 As shown, in some embodiments, a positioning groove 123 is provided on the side of the insulating block 120 away from the substrate 110, and the rivet 133 includes a cap portion 1332 and a shaft portion 1331, one end of the shaft portion 1331 is connected to the cap portion 1332, and the end of the shaft portion 1331 away from the cap portion 1332 passes through the substrate 110, and the cap portion 1332 is embedded in the positioning groove 123. Through the setting of the positioning groove 123, after the shaft portion 1331 passes through the second through hole 121, the cap portion 1332 is embedded in the positioning groove 123, and the rivet 133 is fixed.

[0053] Combination Fig. 9 and Fig.11 As shown, in some embodiments, the positioning groove 123 has a plurality of corners 124, the plurality of corners 124 are provided with a first rounded corner R1, and the radii of at least two first rounded corners R1 are different; a plurality of second rounded corners R2 are provided on the circumferential side of the cap portion 1332, the second rounded corner R2 is arranged corresponding to the first rounded corner R1, and the radii of the correspondingly arranged first rounded corner R1 and second rounded corner R2 are the same.

[0054] Exemplarily, the positioning groove 123 is a rectangular structure, and the positioning groove 123 is provided with four corners 124, and the size of the fillet of each corner 124 is respectively defined, and the cap 1332 is correspondingly a rectangular structure, and is provided with a second fillet R2 having the same radius as the first fillet R1 in the positioning groove 123, so that the cap 1332 is completely embedded in the positioning groove 123. At the same time, the fillet setting methods of the two positioning grooves 123 are different. Since the materials of the positive and negative poles 130 are different, the assembly method of the positive and negative poles 130 is defined, which can effectively prevent the positive and negative poles 130 from being mixed during the assembly process, thereby preventing the corrosion of the poles 130 during the use of the battery, and reducing the safety risks when the battery is used.

[0055] Combination Figure 4 and Figure 6 As shown, in some embodiments, the substrate 110 is provided with a plurality of positioning holes 1113 along the circumferential side of the first through hole 1112, and every two positioning holes 1113 arranged opposite to each other constitute a positioning group, and the distances between two positioning holes 1113 in different positioning groups are different; a plurality of positioning pins 1323 are provided on the side where the separator 132 is bonded to the substrate 110, and the positioning pins 1323 penetrate the positioning holes 1113.

[0056] For example, the number of the positioning holes 1113 can be four, six, eight, etc., and two of them form a positioning group, which can be selected according to actual needs. In this embodiment, the number of the positioning holes 1113 can be four.

[0057] The two positioning holes 1113 of a positioning group are symmetrically arranged about the axis of the first through hole 1112, and the spacing between the two positioning holes 1113 of each positioning group is different. The positioning pins 1323 on the separation pad 132 are arranged corresponding to the positioning holes 1113, so that when the separation pad 132 is inserted into the installation groove 112, each positioning pin 1323 is plugged and matched with a specific positioning hole 1113.

[0058] At the same time, the spacing rules of the positioning holes 1113 of the positive and negative electrodes can be set respectively to prevent the battery corrosion problem caused by the mixed installation of the positive and negative electrode separators 132. For example, in the installation groove 112 of the negative electrode, the spacing between the two positioning holes 1113 distributed along the length direction of the substrate 110 is smaller than the width along the substrate 110, while in the installation groove 112 of the positive electrode, the spacing between the two positioning holes 1113 distributed along the length direction of the substrate 110 is greater than the width along the substrate 110, which are respectively used to embed the positive and negative electrode separators 132, and the spacing between the positioning pins 1323 is set in coordination with the corresponding positioning holes 1113. Thereby, the positive electrode separator 132 is effectively prevented from being assembled into the negative electrode column 130, and when the positive electrode separator 132 is a weakly conductive material, when it is assembled into the negative electrode column 130, the negative electrode side voltage is too low, resulting in battery corrosion. Of course, the distribution form of the positioning holes 1113 is not limited to the above-mentioned example, and other positioning hole 1113 design schemes that can achieve the design effect of this application should be included in the protection scope of this application.

[0059] Combination Figure 4 and Figure 7 As shown, in some embodiments, the apertures of the positioning holes 1113 in different positioning groups are different, and the outer diameter of the positioning pin 1323 is adapted to the aperture of the corresponding positioning hole 1113. The differential structures of the positive and negative electrode positioning holes 1113 and the positioning pins 1323 of the positive and negative electrode separator pads 132 can further effectively prevent the positive and negative electrode separator pads 132 from being mixed.

[0060] Combination Figure 1 and Fig.12 As shown, in some embodiments, a sealing sleeve 134 is sleeved around the rivet 133 , and the sealing sleeve 134 is penetrated and located in the second through hole 121 .

[0061] Exemplarily, the sealing sleeve 134 includes a flange edge 1341 and a sleeve body 1342, wherein the flange edge 1341 is connected to one end of the sleeve body 1342, and the sleeve body 1342 is sleeved outside the shaft portion 1331 of the rivet 133, and inserted into the second through hole 121 together with the shaft portion 1331. Therefore, during the installation process of the rivet 133, the flange edge 1341 and the sleeve body 1342 simultaneously seal the gap between the rivet 133 and the second through hole 121, preventing the pole 130 from being electrically connected to the substrate 110.

[0062] Combination Figure 3 and Figure 4 As shown, in some embodiments, an extended edge portion 1121 is circumferentially provided on the open side of the installation slot 112 , and the extended edge portion 1121 extends toward the outside of the installation slot 112 .

[0063] For example, Figure 3 is a side view of the substrate 110, Figure 4 The top view of the substrate 110 is shown in FIG. One end of the groove wall of the mounting groove 112 is connected to the plate body 111, and the other end forms an edge structure extending outward. The extended edge 1121 can further prevent the electrolyte from entering the gap between the plastic pad and the substrate 110. When the electrolyte overflows on the substrate 110, when cleaning with a towel or air flow, the extended edge 1121 can better guide the flow, which is conducive to cleaning the electrolyte sprayed on the substrate 110. Finally, it prevents the substrate 110 from being corroded by the electrolyte, and ensures the stability and safety of the battery.

[0064] Combination Figure 1 and Figure 2 As shown, in some embodiments, the base plate 110 is provided with an explosion-proof hole 1114 , and dustproof stickers 140 and explosion-proof sheets 150 are respectively provided on both sides of the explosion-proof hole 1114 .

[0065] Exemplarily, the explosion-proof hole 1114 is set at the center of the substrate 110, the dustproof sticker 140 is attached to the top of the explosion-proof hole 1114 at the center of the substrate 110, and the explosion-proof plate 150 is welded to the bottom of the explosion-proof hole 1114. When the battery is operating normally, the explosion-proof plate 150 can be ventilated quickly. When the gas reaches the critical value of the explosion-proof point, it is instantly connected to the outside world, and a large amount of gas is discharged, which can quickly release the strong pressure inside the cavity to avoid or reduce explosion. The dustproof sticker 140 is used to prevent external dust from entering the battery through the explosion-proof hole 1114.

[0066] An embodiment of the present application further provides a secondary battery, comprising the battery cover 100 in any of the above embodiments.

[0067] This embodiment has the battery cover 100 in any of the above embodiments, and therefore has all the beneficial effects of the battery cover 100 in any of the above embodiments, which will not be described in detail here.

[0068] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0069] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A battery cover, characterized in that: include: A base plate, the base plate comprising a plate body and a mounting groove, the plate body being provided with a first injection hole, two mounting grooves being provided, the two mounting grooves being arranged opposite to each other on one side of the plate body, and the mounting grooves being protruding relative to the plate body; An insulating block, the insulating block is arranged on a side of the plate body away from the mounting groove, the insulating block is penetrated by a second liquid injection hole, and the second liquid injection hole is coaxially arranged with the first liquid injection hole; A pole, wherein two poles are provided, and the two poles are respectively installed in the two installation grooves.

2. The battery cover according to claim 1, characterized in that: The pole includes a pressing plate, a separating pad and a rivet. The base plate is penetrated by a first through hole located in the mounting groove, the insulating block is penetrated by a second through hole coaxially arranged with the first through hole, the pressing plate is penetrated by a third through hole, the separating pad is penetrated by a fourth through hole, and the separating pad is embedded in the mounting groove. A receiving groove is provided on the side of the separating pad away from the mounting groove, the pressing plate is embedded in the receiving groove, the rivet penetrates the first through hole, the second through hole, the third through hole and the fourth through hole in sequence, and the rivet is welded to the pressing plate.

3. The battery cover according to claim 2, characterized in that: A positioning groove is provided on the side of the insulating block away from the substrate. The rivet includes a cap and a shaft. One end of the shaft is connected to the cap. One end of the shaft away from the cap passes through the substrate. The cap is embedded in the positioning groove.

4. The battery cover according to claim 3, characterized in that: The positioning groove has a plurality of corners, the plurality of corners are provided with first rounded corners, and at least two of the first rounded corners have different radii; A plurality of second rounded corners are provided on the circumferential side of the cap portion. The second rounded corners are arranged corresponding to the first rounded corners, and the radii of the correspondingly arranged first rounded corners and the second rounded corners are the same.

5. The battery cover according to claim 2, characterized in that: The substrate is provided with a plurality of positioning holes along the circumference of the first through hole, and every two positioning holes arranged opposite to each other form a positioning group, and the distances between two positioning holes in different positioning groups are different; A plurality of positioning pins are provided on one side of the separation pad that is attached to the substrate, and the positioning pins penetrate the positioning holes.

6. The battery cover according to claim 5, characterized in that: The apertures of the positioning holes in different positioning groups are different, and the outer diameter of the positioning pin is adapted to the aperture of the corresponding positioning hole.

7. The battery cover according to claim 5, characterized in that: A sealing sleeve is sleeved around the rivet, and the sealing sleeve is inserted through the third through hole.

8. The battery cover according to any one of claims 1 to 7, characterized in that: An extended edge portion is circumferentially provided on the open side of the installation groove, and the extended edge portion extends toward the outside of the installation groove.

9. The battery cover according to any one of claims 1 to 7, characterized in that: The base plate is provided with an explosion-proof hole through it, and dustproof stickers and explosion-proof sheets are respectively provided on both sides of the explosion-proof hole.

10. A secondary battery, characterized in that: A battery cover comprising the battery cover according to any one of claims 1 to 9.

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