CN218299997U

CN218299997U - Cover plate assembly and battery

Info

Publication number: CN218299997U
Application number: CN202222404288.1U
Authority: CN
Inventors: 闵昌飞; 肖天丽; 黄利明
Original assignee: Hubei Eve Power Co Ltd
Current assignee: Hubei Eve Power Co Ltd
Priority date: 2022-09-09
Filing date: 2022-09-09
Publication date: 2023-01-13
Anticipated expiration: 2032-09-09

Abstract

The utility model relates to the technical field of batteries, a apron subassembly and battery is disclosed, wherein the apron subassembly is including apron main part subassembly, utmost point post and sealed nail, and apron main part subassembly is including the top sheet that stacks gradually the setting, lower plastic and the dish that converges, is provided with corresponding mounting hole and notes liquid hole on top sheet and the lower plastic. Utmost point post wears to locate the mounting hole from one side of top cap piece, and is connected with the dish electricity that converges, still presss from both sides between utmost point post and the top cap piece and is equipped with the plastic, goes up the plastic and forms overall structure through moulding plastics with utmost point post and top cap piece, can prevent that electrolyte from oozing from between the utmost point post mounting hole, reduces the weeping risk, reduces the spare part quantity of apron subassembly, reduces the loaded down with trivial details degree of equipment. The sealing nail comprises an inner sealing nail and an outer sealing nail, the inner sealing nail is inserted into the liquid injection hole, the outer sealing nail is covered on the liquid injection hole and abuts against the inner sealing nail, the sealing nail is welded with the top cover piece, and the liquid leakage phenomenon caused by poor welding is improved by the structural design and the double welding process of the double sealing nail.

Description

Cover plate assembly and battery

Technical Field

The utility model relates to a battery technology field especially relates to an apron subassembly and battery.

Background

The battery needs to be completely sealed, otherwise, leakage of internal electrolyte may be caused, thereby causing great damage to electronic and electric products, instruments, equipment, and the like. However, in the actual production process, the battery may be discarded due to leakage caused by poor sealing or poor sealing of the electrode lead-out portion. It mainly relies on the sealing washer to come the riveting to seal of the apron subassembly of current battery, and the leakage is very easily gone wrong to the actual use process utmost point post department, and the structure is too much, assembles loaded down with trivial details. The liquid injection port is sealed in the form of sealing colloidal particles and sealing nails, and poor welding of the sealing nails exists, so that the plastic sealing colloidal particles do not have a sealing effect, and the leakage of the battery is caused.

Therefore, a cover assembly and a battery are needed to solve the above problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an apron subassembly can effectively avoid the battery weeping, guarantees the product quality of battery.

As the conception, the utility model adopts the technical proposal that:

a cover plate assembly comprising:

the cover plate main body assembly comprises a top cover plate, lower plastic and a confluence plate which are sequentially stacked, and the top cover plate and the lower plastic are provided with corresponding mounting holes and liquid injection holes;

the pole column penetrates through the mounting hole from one side of the top cover plate and is electrically connected with the bus tray, an upper plastic cement is clamped between the pole column and the top cover plate, and the upper plastic cement, the pole column and the top cover plate form an integral structure through injection molding;

the sealing nail comprises an inner sealing nail and an outer sealing nail, the inner sealing nail is inserted into the liquid injection hole, the outer sealing nail is covered on the liquid injection hole and abuts against the inner sealing nail, and the sealing nail is welded with the top cover plate.

Optionally, annotate the liquid hole and be the shoulder hole, it has the ladder face to annotate the liquid hole, interior sealed nail is followed one side of top cap piece is inserted and is located in annotating the liquid hole, interior sealed nail butt outer sealed nail the ladder face with annotate the inner wall in liquid hole.

Optionally, interior sealed nail is including the first portion and the second portion that are connected, annotate the liquid hole including the big footpath section and the path section that are connected, first position in big footpath section and butt outer sealed nail the ladder face with the inner wall of big footpath section, the second position in the path section, first portion with the inner wall welding of big footpath section.

Optionally, the top cover plate is further provided with a fixing groove, the fixing groove is annularly arranged on the periphery of the liquid injection hole, and the edge of the outer sealing nail extends into the fixing groove and abuts against the inner wall of the fixing groove.

Optionally, one side of the edge of the outer sealing nail facing the lower plastic is provided with a protruding portion, and the protruding portion is located in the fixing groove and welded to the inner wall of the fixing groove.

Optionally, the top cover piece with still be provided with corresponding pressure release hole on the plastic down, the apron subassembly still includes protecting plate and explosion-proof piece, the protecting plate with the explosion-proof piece corresponds the pressure release hole set up respectively in the both sides of top cover piece, just the explosion-proof piece presss from both sides and locates the top cover piece with between the plastic down.

Optionally, the pressure release hole is for following the top cap piece with the arc hole that the circumference extension of plastic set up down, the protection piece with the shape and the size of explosion-proof piece all with the pressure release hole is unanimous.

Optionally, an explosion-proof notch is arranged on the explosion-proof sheet corresponding to the pressure relief hole, and the explosion-proof notch does not form a closed pattern.

Optionally, the thickness of the explosion-proof sheet is a, the value range of a is 0.15mm-0.4mm, the residual thickness of the explosion-proof sheet at the position of the explosion-proof notch is b, the value range of b is 0.05mm-0.12mm, the discontinuous angle of the explosion-proof notch is alpha, the value range of alpha is 8-35 degrees, and the discontinuous section of the explosion-proof notch is close to the pole.

Another object of the utility model is to provide a battery, this battery is sealed effectual, can effectively avoid the battery weeping, and the tensile strength of casing is high simultaneously, and battery product quality is good.

As the conception, the utility model adopts the technical proposal that:

the battery comprises a shell and the cover plate assembly, wherein one end of the shell is an open end, the cover plate assembly is arranged at the open end, and reinforcing ribs are arranged at the other end of the shell.

Optionally, the battery further includes a battery cell and a case bottom current collecting tray, the battery cell is located in the case, the case bottom current collecting tray is clamped between the battery cell and the other end of the case, the battery cell is electrically connected to the case through the case bottom current collecting tray, and the case bottom current collecting tray is welded to the case.

Optionally, an adaptation groove is formed in one side, abutted to the housing, of the shell bottom confluence disc, and the reinforcing ribs protruding towards one side of the shell bottom confluence disc on the housing are located in the adaptation groove.

The utility model has the advantages that:

the utility model provides a apron subassembly includes apron main part subassembly, utmost point post and sealed nail, and apron main part subassembly is provided with corresponding mounting hole and notes liquid hole on top cap piece and the lower plastic including the top cap piece that stacks gradually the setting, lower plastic and the dish that converges. Wherein utmost point post wears to locate the mounting hole from one side of top cap piece, and with converge the dish electricity and be connected, still press from both sides between utmost point post and the top cap piece and be equipped with the plastic, go up the plastic and form overall structure through moulding plastics with utmost point post and top cap piece, can prevent that electrolyte from oozing from between the mounting hole of utmost point post and top cap piece, reduce the weeping risk, reinforcing apron subassembly leakproofness still can reduce the quantity of the spare part of apron subassembly simultaneously, reduces the loaded down with trivial details degree of equipment. The sealing nail comprises an inner sealing nail and an outer sealing nail, the inner sealing nail is inserted into the liquid injection hole, the outer sealing nail is covered on the liquid injection hole and abuts against the inner sealing nail, the sealing nail is welded with the top cover piece, and the liquid leakage phenomenon at the liquid injection hole of the battery due to poor welding can be greatly improved by using the structural design of the double sealing nail and the double welding process.

The utility model provides a battery includes casing and foretell apron subassembly, and the one end of casing is the opening end, and the apron subassembly sets up in the opening end, is provided with the strengthening rib on the other end of casing, and this battery is sealed effectual, can effectively avoid the battery weeping, and the compressive strength of casing can effectively be strengthened in the setting of strengthening rib moreover.

Drawings

Fig. 1 is an exploded view of a cover plate assembly provided by an embodiment of the present invention;

fig. 2 is a partial cross-sectional view of a cover plate assembly provided by an embodiment of the present invention;

fig. 3 is an exploded view of a portion of a cover plate assembly provided by an embodiment of the present invention;

fig. 4 is a schematic structural diagram of an explosion-proof sheet provided by an embodiment of the present invention;

fig. 5 is a cross-sectional view of a battery provided by an embodiment of the present invention;

fig. 6 is a partial cross-sectional view of a housing provided by an embodiment of the present invention;

fig. 7 is an exploded view of a battery according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a case bottom bus tray provided by the embodiment of the present invention.

In the figure:

10. a cover plate assembly; 20. an electric core; 30. a housing; 301. reinforcing ribs; 40. a shell bottom current collecting plate; 401. an adaptation groove; 402. a liquid guide groove; 50. spacing glue;

1. a pole column; 2. plastic is coated; 3. a top cover sheet; 31. mounting holes; 32. a liquid injection hole; 33. fixing grooves; 34. a pressure relief vent; 4. plastic is discharged; 41. installing ribs; 5. a confluence disc; 6. an inner sealing nail; 61. a first part; 62. a second section; 7. an outer seal nail; 71. a boss portion; 8. a protective sheet; 81. a vent hole; 9. an explosion-proof sheet; 91. and 4, explosion-proof nicking.

Detailed Description

In order to make the technical problem solved by the present invention, the technical solution adopted by the present invention and the technical effect achieved by the present invention clearer, the technical solution of the present invention will be further explained by combining the drawings and by means of the specific implementation manner. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements relevant to the present invention are shown in the drawings.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used based on the orientations and positional relationships shown in the drawings, and are only for convenience of description and simplification of operation, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

As shown in fig. 1 to 4, the present embodiment provides a cover plate assembly 10, which can effectively improve the sealing effect of the battery, prevent the leakage of the electrolyte, and ensure the product quality of the battery.

This apron subassembly 10 includes apron main part subassembly, utmost point post 1 and sealed nail, and wherein apron main part subassembly is including the top sheet 3, lower plastic 4 and the dish 5 that converges that stack gradually the setting, is provided with corresponding mounting hole 31 and annotates the liquid hole 32 on top sheet 3 and the lower plastic 4, and utmost point post 1 wears to locate in mounting hole 31, and sealed nail wears to locate to annotate in the liquid hole 32. Specifically, utmost point post 1 wears to locate in mounting hole 31 from one side of top cap piece 3, and with converge dish 5 electricity and be connected, and for the sealed effect of guaranteeing between utmost point post 1 and the top cap piece 3, still press from both sides between utmost point post 1 and the top cap piece 3 and be equipped with plastic 2. Optionally, go up plastic 2 and form overall structure through moulding plastics and utmost point post 1 and top cap piece 3, prevent that electrolyte from oozing from between the mounting hole 31 of utmost point post 1 and top cap piece 3, reduce the weeping risk, when reinforcing apron subassembly 10 leakproofness, still can reduce the quantity of the spare part of apron subassembly 10, reduce the loaded down with trivial details degree of equipment.

The sealing nail for sealing the liquid injection hole 32 comprises an inner sealing nail 6 and an outer sealing nail 7, wherein the inner sealing nail 6 is inserted into the liquid injection hole 32, the outer sealing nail 7 is covered on the liquid injection hole 32 and is pressed against the inner sealing nail 6, and the inner sealing nail 6 and the outer sealing nail 7 are both welded with the top cover plate 3. Preferably, the material of sealed nail is the same with the material of top flap 3, uses interior sealed nail 6 welding to annotate liquid hole 32 earlier and realizes preliminary sealing, uses outer sealed nail 7 to weld on interior sealed nail 6 again to utilize outer sealed nail 7 to the external force of applying to interior sealed nail 6, make the sealed stability of interior sealed nail 6. By utilizing the structural design of the double sealing nails and the double welding process, the liquid leakage phenomenon caused by poor welding at the liquid injection hole 32 of the battery can be greatly improved.

Alternatively, the pour hole 32 is a stepped hole, the pour hole 32 has a stepped surface, and when the inner seal nail 6 is inserted into the pour hole 32 from one side of the top lid piece 3, the inner seal nail 6 will abut against both the stepped surface and the inner wall of the pour hole 32. As shown in fig. 2, in this embodiment, the stepped hole forming the stepped surface includes a small diameter section and a large diameter section with different diameters, the inner seal nail 6 is inserted from the large diameter section, and is inserted in place when abutting against the stepped surface formed between the large diameter section and the small diameter section, the inner seal nail 6 and the inner wall of the liquid injection hole 32 are welded together, and then the outer seal nail 7 is disposed on the liquid injection hole 32 to abut against the inner seal nail 6.

Preferably, the internal sealing nail 6 comprises a first portion 61 and a second portion 62 which are connected, and when the internal sealing nail 6 is inserted into the liquid injection hole 32, the first portion 61 of the internal sealing nail 6 is inserted into the large diameter section of the liquid injection hole 32, and the second portion 62 of the internal sealing nail 6 passes through the large diameter section of the liquid injection hole 32 and then continues to be inserted into the small diameter section. The first part 61 of the inner seal nail 6 is clamped between the outer seal nail 7, the step surface and the inner wall of the large-diameter section, and the first part 61 is welded with the inner wall of the large-diameter section of the liquid injection hole 32. Preferably, the second portion 62 abuts the inner wall of the small diameter section. The inner seal nail 6 with the first part 61 and the second part 62 connected can form a limiting structure along the axial direction of the liquid injection hole 32 together with the liquid injection hole 32 with the small-diameter section and the large-diameter section with different diameters, so that the inner seal nail 6 can be quickly installed in place.

In order to facilitate the rapid installation of the outer sealing nail 7 and the top cover plate 3 in place, the top cover plate 3 is further provided with a fixing groove 33, the fixing groove 33 is annularly arranged on the periphery of the liquid injection hole 32, the edge of the outer sealing nail 7 extends into the fixing groove 33, and the edge of the outer sealing nail 7 is welded with the inner wall of the fixing groove 33. As shown in fig. 2, in the present embodiment, the outer sealing nail 7 is disposed on the filling hole 32, an end surface of the outer sealing nail 7 facing away from the inner sealing nail 6 is flush with an upper surface of the top cover plate 3 facing away from the lower plastic 4, and the fixing groove 33 is disposed on the upper surface of the top cover plate 3 and recessed toward the lower plastic 4.

Preferably, in order to facilitate the edge of the outer seal nail 7 to extend into the fixing groove 33, the edge of the outer seal nail 7 is provided with a convex portion 71, and the convex portion 71 is located on the side of the outer seal nail 7 facing the lower plastic 4. Wherein the protruding portion 71 conforms to the shape of the fixation groove 33, i.e. the protruding portion 71 abuts the inner wall of the fixation groove 33. In this embodiment, the cross section of the protruding portion 71 is trapezoidal along the radial direction of the outer seal nail 7, which facilitates the protruding portion 71 to extend into the fixing groove 33.

Further optionally, the top cover plate 3 and the lower plastic 4 are further provided with corresponding pressure relief holes 34, the cover plate assembly 10 further includes a protection plate 8 and an explosion-proof plate 9, the protection plate 8 and the explosion-proof plate 9 are respectively disposed on two sides of the top cover plate 3 corresponding to the pressure relief holes 34, and the explosion-proof plate 9 is clamped between the top cover plate 3 and the lower plastic 4. The explosion-proof sheet 9 is used for blasting under the condition of a large amount of gas generated by short circuit, overcharge or overdischarge in the battery, and the pressure relief holes 34 in the top cover sheet 3 and the lower plastic 4 can be communicated after the explosion of the explosion-proof sheet 9, so that the gas can be discharged out of the battery from the pressure relief holes 34 to achieve the purpose of pressure relief. The protection sheet 8 covers the pressure relief hole 34 from the side of the cover plate away from the explosion-proof sheet 9, so that the explosion-proof sheet 9 can be prevented from being damaged from the outside of the battery, and the protection sheet 8 is also provided with a plurality of vent holes 81 which can be communicated with the pressure relief hole 34. Preferably, a plurality of mounting ribs 41 are arranged in the pressure relief hole 34 of the lower plastic 4, two ends of the plurality of mounting ribs 41 are connected to the inner wall of the pressure relief hole 34, and the explosion-proof piece 9 is mounted on the mounting ribs 41 in the pressure relief hole 34 of the lower plastic 4.

Preferably, the explosion-proof notch 91 is arranged on the explosion-proof sheet 9 at a position corresponding to the pressure relief hole 34, and the explosion-proof notch 91 does not form a closed figure, so that after the explosion-proof notch 91 is exploded, the area surrounded by the explosion-proof notch 91 can be connected with other areas of the explosion-proof sheet 9, and the explosion-proof sheet cannot be damaged due to the integral flying.

As shown in fig. 1, in the present embodiment, the pressure relief hole 34 is an arc-shaped hole extending along the circumferential direction of the top cover plate 3 and the lower plastic 4, so as to effectively increase the pressure relief area of the battery, and the shapes and sizes of the protection plate 8 and the explosion-proof plate 9 are the same as those of the pressure relief hole 34.

As shown in fig. 4, in this embodiment, the thickness of the explosion-proof sheet 9 is a, and a ranges from 0.15mm to 0.4mm. The residual thickness of the explosion-proof sheet 9 at the position of the explosion-proof notch 91 is b, and the value range of b is 0.05mm-0.12mm. The explosion-proof nick 91 is a discontinuous nick arranged along the shape of the pressure relief hole 34, and the discontinuous section of the explosion-proof nick 91 is close to the pole 1. The discontinuous angle of the explosion-proof notch 91 is alpha, the value range of the alpha is 8-35 degrees, and the discontinuous angle is an included angle formed by the connection lines of the two ends of the explosion-proof notch 91 and the axis of the top cover plate 3 respectively.

As shown in fig. 5 to 8, the present embodiment further provides a battery, which includes a housing 30 and the above-mentioned cap assembly 10. One end of the housing 30 is an open end, the cover plate assembly 10 is disposed at the open end, and the other end of the housing 30 is provided with a reinforcing rib 301, which can effectively enhance the compressive strength of the housing 30. Specifically, as shown in fig. 5 and 6, the reinforcing rib 301 is an uneven structure provided on the housing 30, and the reinforcing rib 301 has a plurality of reinforcing ribs 301, and each reinforcing rib 301 has an arc-shaped structure coaxial with the housing 30. Wherein, part of the reinforcing ribs 301 are bulges convexly arranged towards one end of the shell 30, part of the reinforcing ribs 301 are bulges convexly arranged towards one end deviating from the shell 30, and the two kinds of reinforcing ribs 301 are arranged at intervals.

Optionally, as shown in fig. 5, the battery further includes a battery cell 20 and a casing bottom bus bar 40, the battery cell 20 is located in the casing 30, the casing bottom bus bar 40 is sandwiched between the battery cell 20 and the other end of the casing 30, the battery cell 20 is electrically connected to the casing 30 through the casing bottom bus bar 40, and the casing bottom bus bar 40 is welded to the casing 30.

Alternatively, as shown in fig. 8, an adapting groove 401 is provided on one side of the case bottom bus bar 40 abutting against the case 30, and the reinforcing rib 301 protruding toward the case bottom bus bar 40 side on the case 30 is located in the adapting groove 401. That is, the housing 30 and the case bottom bus bar 40 may have a concave-convex fitting structure, so as to enhance the welding strength between the case bottom bus bar 40 and the housing 30. In addition, because the aforesaid adaptation groove 401 and the concave-convex cooperation of strengthening rib 301 make the shell bottom converge dish 40 and casing 30 butt closely, be unfavorable for the flow of electrolyte, then the shell bottom converges the dish 40 and sets up one side of adaptation groove 401 and still is provided with liquid guide groove 402 to accelerate the evenly distributed of electrolyte in casing 30.

Optionally, as shown in fig. 5, the battery further includes a spacer glue 50, where the spacer glue 50 is disposed between the side wall of the battery cell 20 and the casing 30, and the spacer glue 50 is used to insulate between the side wall of the battery cell 20 and the casing 30, so as to avoid short circuit of the battery.

The above embodiments have been described only the basic principles and features of the present invention, and the present invention is not limited by the above embodiments, and is not departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A cover plate assembly, comprising:

the cover plate main body assembly comprises a top cover plate (3), lower plastic (4) and a confluence disc (5) which are sequentially stacked, wherein the top cover plate (3) and the lower plastic (4) are provided with corresponding mounting holes (31) and liquid injection holes (32);

the pole post (1) penetrates through the mounting hole (31) from one side of the top cover plate (3) and is electrically connected with the confluence disc (5), an upper plastic (2) is clamped between the pole post (1) and the top cover plate (3), and the upper plastic (2) forms an integral structure with the pole post (1) and the top cover plate (3) through injection molding;

the sealing nail comprises an inner sealing nail (6) and an outer sealing nail (7), the inner sealing nail (6) is inserted into the liquid injection hole (32), the outer sealing nail (7) is covered on the liquid injection hole (32) and abuts against the inner sealing nail (6), and the sealing nail is welded with the top cover piece (3).

2. The cover plate assembly according to claim 1, wherein the liquid injection hole (32) is a stepped hole, the liquid injection hole (32) has a stepped surface, the inner sealing nail (6) is inserted into the liquid injection hole (32) from one side of the top cover sheet (3), and the inner sealing nail (6) abuts against the outer sealing nail (7), the stepped surface and the inner wall of the liquid injection hole (32).

3. The lid assembly according to claim 2, wherein the inner sealing spike (6) comprises a first portion (61) and a second portion (62) connected, the pour hole (32) comprises a large diameter section and a small diameter section connected, the first portion (61) is located at the large diameter section and abuts against the outer sealing spike (7), the stepped surface and an inner wall of the large diameter section, the second portion (62) is located at the small diameter section, and the first portion (61) is welded with the inner wall of the large diameter section.

4. The cover plate assembly according to claim 1, wherein the top cover plate (3) is further provided with a fixing groove (33), the fixing groove (33) is annularly arranged on the periphery of the liquid injection hole (32), and the edge of the outer sealing nail (7) extends into the fixing groove (33) and abuts against the inner wall of the fixing groove (33).

5. The cover plate assembly according to claim 4, wherein a side of the edge of the outer sealing nail (7) facing the lower plastic (4) is provided with a protruding portion (71), and the protruding portion (71) is located in the fixing groove (33) and welded with the inner wall of the fixing groove (33).

6. The cover plate assembly according to claim 1, wherein the top cover plate (3) and the lower plastic (4) are further provided with corresponding pressure relief holes (34), the cover plate assembly (10) further comprises a protection plate (8) and an explosion-proof plate (9), the protection plate (8) and the explosion-proof plate (9) are respectively arranged on two sides of the top cover plate (3) corresponding to the pressure relief holes (34), and the explosion-proof plate (9) is clamped between the top cover plate (3) and the lower plastic (4).

7. The cover plate assembly according to claim 6, wherein the pressure relief hole (34) is an arc-shaped hole extending along the circumferential direction of the top cover plate (3) and the lower plastic (4), and the shape and size of the protection plate (8) and the explosion-proof plate (9) are consistent with those of the pressure relief hole (34).

8. The cover plate assembly according to claim 6, wherein the explosion-proof sheet (9) is provided with an explosion-proof score (91) at a position corresponding to the pressure relief hole (34), and the explosion-proof score (91) does not form a closed figure.

9. The cover plate assembly according to claim 8, wherein the thickness of the explosion-proof sheet (9) is a, the range of a is 0.15mm to 0.4mm, the residual thickness of the explosion-proof sheet (9) at the position of the explosion-proof score (91) is b, the range of b is 0.05mm to 0.12mm, the discontinuous angle of the explosion-proof score (91) is alpha, the range of alpha is 8 degrees to 35 degrees, and the discontinuous section of the explosion-proof score (91) is close to the pole (1).

10. Battery, characterized in that it comprises a casing (30) and a cover assembly (10) according to any one of claims 1-9, one end of the casing (30) being open-ended, the cover assembly (10) being arranged at the open end, the other end of the casing (30) being provided with stiffening ribs (301).

11. The battery of claim 10, further comprising a cell (20) and a bottom-shell bus bar (40), wherein the cell (20) is located within the housing (30), wherein the bottom-shell bus bar (40) is sandwiched between the cell (20) and the other end of the housing (30), wherein the cell (20) is electrically connected to the housing (30) through the bottom-shell bus bar (40), and wherein the bottom-shell bus bar (40) and the housing (30) are welded.

12. The battery according to claim 11, characterized in that an adapting groove (401) is provided on the side of the housing bottom bus bar (40) abutting against the housing (30), and the reinforcing ribs (301) protruding toward the side of the housing bottom bus bar (40) on the housing (30) are located in the adapting groove (401).