Battery cover plate and battery

Abstract

The utility model belongs to the technical field of batteries, and particularly discloses a battery cover plate and a battery, and the battery cover plate comprises a top cover sheet, a connecting ring and an anti-explosion valve. The connecting ring is arranged in the first mounting hole in the top cover piece and comprises a first connecting part and a second connecting part, the top cover piece and the second connecting part are made of stainless steel materials, and the second connecting part is connected with the top cover piece in a welded mode. The anti-explosion valve is arranged in the second mounting hole of the first connecting part, the anti-explosion valve and the first connecting part are made of aluminum materials, and the anti-explosion valve is connected with the first connecting part in a welded mode. The top cover piece and the second connecting part as well as the anti-explosion valve and the first connecting part are made of the same material, and the melting points of the materials on the two sides of the welding position are the same, so that the welding reliability is ensured, and the welding yield is improved. And the explosion-proof valve made of the aluminum material is stable in valve opening pressure and better in safety performance. Meanwhile, the mechanical strength of the top cover piece is high, and good impact resistance is achieved. The utility model further provides a battery which comprises the battery cover plate.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a battery cover plate and battery. BACKGROUND

[0002] At present, the top cover sheet of battery cover plate is mostly made of aluminum alloy material, although the aluminum alloy material is relatively light, but its hardness is not high, and deformation or damage is prone to occur when being bumped, and the reliability is low. Therefore, some top cover sheets made of stainless steel material appear. Compared with the traditional aluminum battery cover plate, the battery cover plate made of stainless steel material has higher material strength, stronger impact resistance, higher safety and reliability, and has good application prospect in future development.

[0003] As an important part of the battery cover plate, the safety and stability of the explosion-proof valve are of the utmost importance. In the prior art, the battery cover plate made of stainless steel material has an integrated explosion-proof valve made of stainless steel material. However, due to the material difference between the aluminum explosion-proof valve and the stainless steel top cover sheet, the melting points are different, and problems are prone to occur during welding, the welding quality is poor, and the welding yield is low. SUMMARY

[0004] The utility model discloses a battery cover plate and battery, the top cover sheet and explosion-proof valve between it are connected through the connecting ring made of steel aluminum composite material, avoid the defect produced when using the welding of dissimilar materials, guarantee explosion-proof valve and top cover sheet stable, reliable connection.

[0005] To achieve this purpose, the utility model adopts the following technical scheme:

[0006] On the one hand, the utility model provides a kind of battery cover plate, comprising:

[0007] Top cover sheet is equipped with first installation hole;

[0008] Connecting ring is arranged in the first installation hole;The connecting ring includes annular first connecting portion and second connecting portion, and the second connecting portion is located in the peripheral direction of the first connecting portion, and the second connecting portion and the first connecting portion at least partially overlap along the thickness direction of the top cover sheet, the top cover sheet, the second connecting portion is stainless steel material, the second connecting portion is welded with the top cover sheet, and the first connecting portion forms second installation hole away from the inner side of the second connecting portion;

[0009] An explosion-proof valve is arranged in the second mounting hole, the explosion-proof valve and the first connecting part are made of aluminum material, and the explosion-proof valve is welded with the first connecting part.

[0010] The first connecting part and the second connecting part are in an integrated structure.

[0011] Optionally, one side of the top cover sheet is provided with a first sunken platform, the first sunken platform is coaxial with and communicates with the first mounting hole, the connecting ring is arranged in the first mounting hole from the side of the top cover sheet provided with the first sunken platform, the end face of the second connecting part towards the side of the top cover sheet abuts against the first bottom wall of the first sunken platform, and the circumferential side wall of the second connecting part is welded with the first side wall of the first sunken platform.

[0012] Optionally, one side of the first connecting part is provided with a second sunken platform, the second sunken platform is coaxial with and communicates with the second mounting hole, the explosion-proof valve is arranged in the second mounting hole from the side of the first connecting part provided with the second sunken platform, the end face of the explosion-proof valve towards the side of the first connecting part abuts against the second bottom wall of the second sunken platform, and the circumferential edge of the explosion-proof valve is welded with the second side wall of the second sunken platform.

[0013] Optionally, the explosion-proof valve comprises a valve body, a transition part and a welding part, the transition part is connected with the valve body and the welding part respectively at two sides, the end face of the welding part towards the side of the first connecting part abuts against the second bottom wall, and the circumferential side wall of the welding part is welded with the second side wall.

[0014] Optionally, a weak part is arranged on the valve body, an opening part is formed on the inner side of the weak part, and the outer side of the weak part is connected with the transition part.

[0015] The center of the opening part is protruded towards the side close to the first connecting part, and the transition part is arranged in an inclined manner relative to the axis of the second mounting hole and away from the first connecting part.

[0016] Optionally, the first sunken platform and the second sunken platform are arranged towards the same side.

[0017] Optionally, the battery cover plate further comprises a first plastic part, a second plastic part, a connecting block and a pole, the first plastic part and the second plastic part are arranged on two sides of the top cover sheet respectively, the connecting block is arranged on the side of the first plastic part away from the top cover sheet, and one end of the pole is connected with the connecting block after penetrating through the second plastic part, the top cover sheet and the first plastic part.

[0018] Optionally, the battery cover plate further comprises a sealing member sleeved on the pole, the sealing member comprises a first sealing part in the form of a ring, a second sealing part arranged circumferentially around the first sealing part, and a third sealing part arranged circumferentially around the second sealing part.

[0019] Optionally, the second plastic part is provided with a ventilation hole, and a projection of the ventilation hole on the top cover sheet overlaps a projection of the explosion-proof valve on the top cover sheet in a thickness direction of the top cover sheet.

[0020] And / or, the second plastic part is provided with a second limiting rib for limiting an end of the pole abutting against the second plastic part.

[0021] In another aspect, the utility model provides a kind of battery, comprising the battery cover plate in any of the above scheme.

[0022] The utility model has the advantages of:

[0023] The utility model provides a kind of battery cover plate, including top cover sheet, connecting ring and explosion-proof valve. First mounting hole is equipped on top cover sheet, and connecting ring is arranged in first mounting hole. Connecting ring includes the first connecting part and the second connecting part in the form of a ring, and the second connecting part is located in the circumferential direction of the first connecting part. Top cover sheet and the second connecting part are made of stainless steel material. The second connecting part is welded to the top cover sheet. The second mounting hole is formed on the inner side of the first connecting part away from the second connecting part. The explosion-proof valve is arranged in the second mounting hole. The explosion-proof valve and the first connecting part are made of aluminum material. The explosion-proof valve is welded to the first connecting part. When top cover sheet and explosion-proof valve are assembled, the welding position of top cover sheet and the second connecting part is made of the same material. The welding position of the explosion-proof valve and the first connecting part is made of the same material. The melting points of the materials on both sides of the welding position are the same. The reliability of welding is ensured. The yield of welding is improved. Top cover sheet and explosion-proof valve are connected stably and firmly. The explosion-proof valve made of aluminum material can ensure stable valve opening pressure. The battery cover plate has higher safety performance. Top cover sheet is made of stainless steel material. The mechanical strength is higher. The battery cover plate has stronger impact resistance. The battery cover plate is more reliable and safe.

[0024] The utility model also provides a kind of battery, including shell and above-mentioned battery cover plate. Shell is also made of stainless steel material. Since the materials of shell and top cover sheet are both stainless steel material, they have strong hardness and ductility. The reliability of pole group packaging can be improved. The impact resistance of battery is superior. The explosion-proof valve made of aluminum material can ensure stable valve opening pressure. The reliability and safety of battery are improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1It is the explosion map of the battery cover plate provided in the embodiment of the utility model;

[0026] Figure 2 It is the explosion map of the battery cover plate in another view provided in the embodiment of the utility model;

[0027] Figure 3 It is the plan view of the battery cover plate provided in the embodiment of the utility model;

[0028] Figure 4 It is Figure 3 The section view of A-A section in the middle;

[0029] Figure 5 It is Figure 4 The local enlarged view of B in the middle;

[0030] Figure 6 It is Figure 4 The local enlarged view of C in the middle;

[0031] Figure 7 It is the structure schematic view of the connecting ring provided in the embodiment of the utility model;

[0032] Figure 8 It is the structure schematic view of the connecting ring in another view provided in the embodiment of the utility model;

[0033] Figure 9 It is the structure schematic view of the explosion-proof valve provided in the embodiment of the utility model.

[0034] In the figure,

[0035] 100, top cover sheet; 101, first mounting hole; 102, first through hole; 110, first sink; 111, first bottom wall; 112, first side wall; 120, second limiting protrusion;

[0036] 200, connecting ring; 201, second mounting hole; 210, first connecting part; 211, second sink; 2111, second bottom wall; 2112, second side wall; 2113, transition surface; 220, second connecting part;

[0037] 300, explosion-proof valve; 310, valve body; 311, weak part; 312, opening part; 320, transition part; 330, welding part;

[0038] 400, first plastic part; 401, second through hole; 410, plastic part body; 420, first limiting rib; 430, first limiting protrusion; 440, second limiting groove;

[0039] 500, second plastic part; 501, third through hole; 510, air hole; 520, second limiting rib;

[0040] 600, connecting block; 601, fourth through hole; 610, third sink; 620, first limiting groove;

[0041] 700, pole; 710, plate body; 720, first columnar part; 730, second columnar part; 731, annular convex part; 800, sealing member; 810, first sealing part; 820, second sealing part; 830, third sealing part. DETAILED DESCRIPTION

[0042] The utility model will be described in further detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the utility model and are not limited to the utility model. In addition, it should be noted that only the parts related to the utility model are shown in the drawings for ease of description, not all the structures.

[0043] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0044] In the utility model, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0045] In the description of the embodiment, the terms "upper", "lower", "left", "right" and other orientation or position relationship are based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only used to distinguish in description and have no special meaning.

[0046] As Figures 1-2 , and Figure 7 and Figure 8As shown, this embodiment provides a battery cover, which includes a top cover 100, a connecting ring 200, and an explosion-proof valve 300. The top cover 100 has a first mounting hole 101, and the connecting ring 200 is disposed within the first mounting hole 101. The connecting ring 200 includes a first connecting portion 210 and a second connecting portion 220 that are annular in shape. The second connecting portion 220 is located circumferentially to the first connecting portion 210 and extends along the thickness direction of the top cover 100. Figure 1 (In the Z-axis direction shown) The second connecting portion 220 at least partially overlaps with the first connecting portion 210. The top cover plate 100 and the second connecting portion 220 are made of stainless steel, and the second connecting portion 220 is welded to the top cover plate 100. The first connecting portion 210 forms a second mounting hole 201 on its inner side away from the second connecting portion 220. The explosion-proof valve 300 is disposed in the second mounting hole 201. The explosion-proof valve 300 and the first connecting portion 210 are made of aluminum, and the explosion-proof valve 300 is welded to the first connecting portion 210.

[0047] The connecting ring 200 is made of steel-aluminum composite material by stamping. The first connecting part 210 and the second connecting part 220 are integral structures. The periphery of the first connecting part 210 and the second connecting part 220 are transitioned through a transition surface 2113. The connection between the end faces of the first connecting part 210 and the second connecting part 220 that are close to each other does not require welding. Therefore, when the top cover 100 and the explosion-proof valve 300 are assembled in this embodiment, the welding positions of the top cover 100 and the second connecting part 220 are made of the same material, and the welding positions of the explosion-proof valve 300 and the first connecting part 210 are made of the same material. The melting points of the materials on both sides of the welding position are the same, which ensures the reliability of the welding, improves the welding yield, and makes the connection between the top cover 100 and the explosion-proof valve 300 stable and firm. Furthermore, by using aluminum material to make the explosion-proof valve 300, its opening pressure can be guaranteed to be stable, and the battery cover has higher safety performance. Meanwhile, the top cover 100 is made of stainless steel, which has high mechanical strength, ensuring that the battery cover has stronger impact resistance and is more reliable and safer.

[0048] See Figures 3-5The one side of the top cover sheet 100 is provided with a first sunken platform 110 coaxial with and in communication with the first mounting hole 101. The connecting ring 200 is mounted into the first mounting hole 101 from the one side of the top cover sheet 100 provided with the first sunken platform 110. The end face of the second connecting part 220 towards the one side of the top cover sheet 100 abuts against the first bottom wall 111 of the first sunken platform 110. The circumferential side wall of the second connecting part 220 is welded with the first side wall 112 of the first sunken platform 110. The one side of the first connecting part 210 is provided with a second sunken platform 211 coaxial with and in communication with the second mounting hole 201. The explosion-proof valve 300 is mounted into the second mounting hole 201 from the one side of the first connecting part 210 provided with the second sunken platform 211. The end face of the explosion-proof valve 300 towards the one side of the first connecting part 210 abuts against the second bottom wall 2111 of the second sunken platform 211. The circumferential edge of the explosion-proof valve 300 is welded with the second side wall 2112 of the second sunken platform 211.

[0049] Optionally, referring to Figure 5 and Figure 9 , the explosion-proof valve 300 in the embodiment includes a valve body 310, a transition part 320 and a welding part 330. The two sides of the transition part 320 are connected with the valve body 310 and the welding part 330 respectively. The end face of the welding part 330 towards the one side of the first connecting part 210 abuts against the second bottom wall 2111 of the second sunken platform 211. The circumferential side wall of the welding part 330 is welded with the second side wall 2112 of the second sunken platform 211. Further, the valve body 310 is provided with a weak part 311. The weak part 311 is annular or C-shaped. The inside of the weak part 311 is surrounded to form an opening part 312. The outside of the weak part 311 is connected with the transition part 320. The weak part 311 can be realized by machining a notch on the valve body 310. The mechanical strength of the weak part 311 is reduced. When the pressure on the one side of the battery cover plate exceeds the valve opening pressure, the weak part 311 breaks the connection between the opening part 312 and the transition part 320. At this time, the exhaust passage is formed at the opening part 312, so that the gas on the one side of the battery cover plate can pass through.

[0050] Further, the center of the opening part 312 in the embodiment protrudes towards the side close to the first connecting part 210, facilitating valve opening and ensuring that the explosion-proof valve 300 can be smoothly opened when reaching the valve opening pressure, ensuring the safety of the battery. Optionally, the transition part 320 in the embodiment is arranged to be inclined relative to the axis of the second mounting hole 201 and away from the first connecting part 210. Thus, the assembly structure between the explosion-proof valve 300 and the connecting ring 200 is more compact. The size of the explosion-proof valve 300 along the thickness direction of the top cover sheet 100 is smaller. The stress state of the explosion-proof valve 300 is better, avoiding stress concentration.

[0051] As an optional solution, the first sink 110 in the embodiment is arranged on the end surface of the top cover sheet 100 facing the pole group, and the second sink 211 is arranged on the end surface of the first connecting part 210 facing the pole group. The first sink 110 and the second sink 211 are arranged on the same side, and both of them are located on the side of the battery cover plate facing the pole group. Of course, in other embodiments, the first sink 110 can be arranged on the end surface of the top cover sheet 100 facing the pole group, and the second sink 211 can be arranged on the end surface of the first connecting part 210 away from the pole group. At this time, the installation directions of the connecting ring 200 and the explosion-proof valve 300 are different, and the remaining structures are not different.

[0052] Continuing to refer to Figure 1 , Figure 2 and Figure 6 , the battery cover plate further comprises a first plastic part 400, a second plastic part 500, a connecting block 600 and a pole 700. The first plastic part 400 and the second plastic part 500 are arranged on both sides of the top cover sheet 100 respectively. The connecting block 600 is arranged on the side of the first plastic part 400 away from the top cover sheet 100. One end of the pole 700 passes through the second plastic part 500, the top cover sheet 100 and the first plastic part 400, and is connected with the connecting block 600. Exemplarily, the top cover sheet 100 is provided with a first through hole 102, the first plastic part 400 is provided with a second through hole 401, the second plastic part 500 is provided with a third through hole 501, and the connecting block 600 is provided with a fourth through hole 601. The pole 700 comprises a plate body part 710, a first column part 720 and a second column part 730. The second column part 730 passes through the third through hole 501, the first through hole 102, the second through hole 401 and the fourth through hole 601 in sequence, and is riveted with the connecting block 600. After riveting, the second column part 730 forms an annular protrusion 731, and the annular protrusion 731 abuts against the third sink 610 on the connecting block 600. Thus, the pole 700 is fixed on the top cover sheet 100 through the plate body part 710 and the annular protrusion 731. The first plastic part 400 and the second plastic part 500 are made of insulating material, and the connecting block 600 is made of aluminum material. The top cover sheet 100 is insulated from the connecting block 600 through the first plastic part 400, and the plate body part 710 of the pole 700 is insulated from the top cover sheet 100 through the second plastic part 500.

[0053] Further, the battery cover plate further comprises a sealing member 800 sleeved on the pole 700, the sealing member 800 comprises a first sealing portion 810 in the form of a ring, a second sealing portion 820 arranged in the circumferential direction of the first sealing portion 810, and a third sealing portion 830 arranged in the circumferential direction of the second sealing portion 820. The first sealing portion 810 is used to seal the gap between the pole 700 and the first plastic member 400 and the top cover sheet 100, the second sealing portion 820 is used to seal the gap between the pole 700 and the top cover sheet 100, and the third sealing portion 830 is used to seal the gap between the pole 700 and the top cover sheet 100 and the second plastic member 500. The sealing member 800 ensures that the battery cover plate has good sealing performance and avoids the problem of gas leakage or liquid leakage.

[0054] With reference to Figure 1 and Figure 5 , the second plastic member 500 is provided with a vent hole 510, and the projection of the vent hole 510 on the top cover sheet 100 overlaps the projection of the explosion-proof valve 300 on the top cover sheet 100 in the thickness direction of the top cover sheet 100. When the explosion-proof valve 300 is opened, the vent hole 510 is in communication with the exhaust passage of the explosion-proof valve 300, and the vent hole 510 and the explosion-proof valve 300 can realize the pressure relief function of the battery cover plate, thereby ensuring the safety of the battery. Optionally, the vent hole 510 on the second plastic member 500 can be provided with a plurality of vent holes 510, so that the flow area of the vent hole 510 matches the flow area of the exhaust passage, thereby facilitating the acceleration of the exhaust speed and improving the exhaust efficiency.

[0055] With reference to Figure 1 and Figure 2 , the first plastic member 400 in the embodiment comprises a plastic member body 410 and four first limiting ribs 420 arranged in the circumferential direction of the plastic member body 410. The plastic member body 410 and the first limiting ribs 420 form a receiving groove, and the connecting block 600 is received in the receiving groove. The first limiting ribs 420 can limit the positional relationship between the connecting block 600 and the first plastic member 400, thereby ensuring the accurate positioning between the connecting block 600 and the first plastic member 400. Further, the second plastic member 500 is provided with a plurality of second limiting ribs 520, and the plurality of second limiting ribs 520 are sequentially connected to form a square frame structure. The square frame structure formed by the second limiting ribs 520 can limit the plate body portion 710 of the pole 700, thereby ensuring the accurate positioning between the pole 700 and the second plastic member 500 and improving the assembly precision of the battery cover plate.

[0056] Optionally, the first limiting protrusion 430 is arranged on the plastic body 410, and the first limiting groove 620 is arranged on the connecting block 600. The first limiting protrusion 430 is accommodated in the first limiting groove 620. Through cooperation between the first limiting protrusion 430 and the first limiting groove 620, the positioning between the first plastic part 400 and the connecting block 600 is more accurate, and the two have a certain guiding effect when being assembled, which is beneficial to improve the assembly precision of the battery cover plate. Optionally, the first limiting protrusion 430 on the first plastic part 400 is provided with two first limiting protrusions 430, and the two first limiting protrusions 430 are arranged at opposite corners of the first plastic part 400. Correspondingly, the first limiting groove 620 is arranged at a corresponding position on the connecting block 600.

[0057] Further, the second limiting protrusion 120 is arranged on the top cover sheet 100, and the second limiting groove 440 is arranged on the first plastic part 400. The second limiting protrusion 120 is accommodated in the second limiting groove 440. Through cooperation between the second limiting protrusion 120 and the second limiting groove 440, the positioning between the first plastic part 400 and the top cover sheet 100 is more accurate, and the two have a certain guiding effect when being assembled, which is beneficial to improve the assembly precision of the battery cover plate. Optionally, the first plastic part 400 is provided with two first plastic parts 400, each of which is provided with two second limiting grooves 440. The second limiting protrusion 120 on the top cover sheet 100 is provided with four second limiting protrusions 120, and each two second limiting protrusions 120 correspond to one first plastic part 400. That is, the second limiting groove 440 on the first plastic part 400 corresponds to the second limiting protrusion 120 on the top cover sheet 100 in one-to-one correspondence. The two second limiting grooves 440 are arranged at opposite corners of the first plastic part 400. Correspondingly, the same number of first limiting grooves 620 are arranged at corresponding positions on the top cover sheet 100.

[0058] As an optional solution, the first limiting protrusion 430 and the second limiting groove 440 on the first plastic part 400 can be formed by stamping. Specifically, when the first plastic part 400 is stamped by a mold, the first limiting protrusion 430 is formed on one side of the plastic body 410, and the second limiting groove 440 is formed on the opposite side of the first limiting protrusion 430, thereby improving the processing efficiency and simplifying the processing steps. Of course, in other embodiments, the first limiting protrusion 430 and the second limiting groove 440 can also be arranged separately, which is not limited here.

[0059] This embodiment also provides a battery, including a casing, electrode assembly, and the aforementioned battery cover. An opening is provided on one side of the casing, through which the electrode assembly is inserted into the casing. The battery cover is sealed at the opening of the casing, and the top cover plate 100 of the battery cover is welded to the casing. The electrode tabs of the electrode assembly are connected to the terminal posts 700 integrated on the battery cover. The casing can also be made of stainless steel. Since both the casing and the top cover plate 100 are made of stainless steel, they possess high hardness and ductility, improving the reliability of the electrode assembly encapsulation and giving the battery superior impact resistance. Simultaneously, the explosion-proof valve 300, made of aluminum, ensures stable valve opening pressure, further enhancing the battery's reliability and safety, and offering better application prospects.

[0060] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A battery cover plate, characterized by, The utility model relates to a top cover sheet (100) is provided with first mounting hole (101), connecting ring (200) is arranged in first mounting hole (101), connecting ring (200) includes annular first connecting portion (210) and second connecting portion (220), second connecting portion (220) is located the circumference of first connecting portion (210), and second connecting portion (220) and first connecting portion (210) at least partial overlap along the thickness direction of top cover sheet (100), top cover sheet (100), second connecting portion (220) are stainless steel material, second connecting portion (220) and top cover sheet (100) are welded connection, and second mounting hole (201) is formed to the inner side of first connecting portion (210) away from second connecting portion (220), Explosion-proof valve (300) is arranged in second mounting hole (201), explosion-proof valve (300), first connecting portion (210) are aluminum material, and explosion-proof valve (300) and first connecting portion (210) are welded connection, Wherein, first connecting portion (210), second connecting portion (220) are integral structure. One side of top cover sheet (100) is equipped with first sunken platform (110), first sunken platform (110) is coaxial with first mounting hole (101) and intercommunication, connecting ring (200) is loaded into first mounting hole (101) from the side of top cover sheet (100) and is equipped with first sunken platform (110), and the end face of second connecting portion (220) towards the side of top cover sheet (100) is abutted to the first bottom wall (111) of first sunken platform (110), and the circumferential side wall of second connecting portion (220) is welded with the first side wall (112) of first sunken platform (110). One side of first connecting portion (210) is equipped with second sunken platform (211), second sunken platform (211) is coaxial with second mounting hole (201) and intercommunication, explosion-proof valve (300) is loaded into second mounting hole (201) from the side of first connecting portion (210) and is equipped with second sunken platform (211), and the end face of explosion-proof valve (300) towards the side of first connecting portion (210) is abutted to the second bottom wall (2111) of second sunken platform (211), and the circumferential edge of explosion-proof valve (300) is welded with the second side wall (2112) of second sunken platform (211).

2. The battery cover plate of claim 1, wherein, Explosion-proof valve (300) includes valve body (310), transition portion (320) and welding portion (330), both sides of transition portion (320) are connected valve body (310) and welding portion (330) respectively, the end face of welding portion (330) towards the side of first connecting portion (210) is abutted to second bottom wall (2111), and the circumferential side wall of welding portion (330) is welded with second side wall (2112).

3. The battery cover plate of claim 2, wherein, ​ 4. The battery cover plate of claim 3, wherein, ​ 5. The battery cover plate of claim 4, wherein, The valve body (310) is provided with a weak portion (311), and an opening portion (312) is formed on the inner side of the weak portion (311), and the outer side of the weak portion (311) is connected with the transition portion (320); The center of the opening portion (312) is protruded towards the side close to the first connecting portion (210), and the transition portion (320) is arranged to be inclined relative to the axis of the second mounting hole (201) and away from the first connecting portion (210).

6. The battery cover plate of claim 3, wherein, The first sunken platform (110) and the second sunken platform (211) are arranged towards the same side.

7. The battery cover plate of claim 1, wherein, The battery cover plate further comprises a first plastic part (400), a second plastic part (500), a connecting block (600) and a pole (700), the first plastic part (400) and the second plastic part (500) are arranged on the two sides of the top cover sheet (100) respectively, the connecting block (600) is arranged on the side of the first plastic part (400) away from the top cover sheet (100), and one end of the pole (700) is connected with the connecting block (600) after penetrating through the second plastic part (500), the top cover sheet (100) and the first plastic part (400).

8. The battery cover plate of claim 7, wherein, The battery cover plate further comprises a sealing part (800), the sealing part (800) is sleeved on the pole (700), and the sealing part (800) comprises a first sealing portion (810), a second sealing portion (820) and a third sealing portion (830) in the shape of a ring, the second sealing portion (820) is arranged in the circumferential direction of the first sealing portion (810), and the third sealing portion (830) is arranged in the circumferential direction of the second sealing portion (820).

9. The battery cover plate of claim 7, wherein, The second plastic part (500) is provided with a ventilation hole (510), and the projection of the ventilation hole (510) on the top cover sheet (100) coincides with the projection of the explosion-proof valve (300) on the top cover sheet (100) along the thickness direction of the top cover sheet (100). And / or, the second plastic part (500) is provided with a second limiting rib (520), and the second limiting rib (520) is used for limiting the end of the pole (700) abutting against the second plastic part (500).

10. A battery, characterized by The battery cover plate comprises the battery cover plate according to any one of claims 1-9. The battery cover plate comprises the battery cover plate according to any one of claims 1-9.

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