Cover plate assembly, battery and electrical device

Abstract

The present disclosure relates to a cover plate assembly, a battery, and an electrical device. The cover plate assembly comprises a cover plate and a cover cap provided independently of the cover plate. The cover plate is provided with a cover plate through hole passing through two opposite sides of the cover plate in the thickness direction, the bottom of the cover cap being fixed on the cover plate and sealing the side of the cover plate through hole close to the cover cap. The cover cap protrudes from the cover plate in the direction facing away from the cover plate through hole, and the cover cap is internally provided with a cover cap inner cavity in communication with the cover plate through hole. According to the cover plate assembly of the embodiments of the present disclosure, the cover cap is provided independently of the cover plate, such that a tab can pass through the cover plate through hole and then be welded to a lead-out sheet, and after the welding of the tab and the lead-out sheet is completed, the cover plate through hole is sealed by means of the cap, thereby optimizing the assembly process flow of batteries. Tabs can pass through cover plate through holes and then be welded to lead-out sheets, thereby preventing the damage to electrode cores caused by heat radiation, splashing and the like during welding.

Description

Cover plate assembly, battery and electric device

[0001] The present application claims priority to the Chinese patent application No. 202421794704.6 filed on July 26, 2024, and titled "Cover plate assembly, battery and electric device", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] Embodiments of the present disclosure relate to the technical field of battery, in particular to a cover plate assembly, a battery and an electric device. BACKGROUND

[0003] In the related art, a battery includes a cover plate assembly, a shell and a core, the cover plate assembly includes a cover plate, a pole and a lead-out sheet, the shell is in a barrel shape with one end being open, the cover plate of the cover plate assembly is fixed at the opening of the shell to form a sealed space at the inner side of the two, the core is arranged in the sealed space, the tab of the core is welded on the lead-out sheet, and the lead-out sheet is welded with the pole.

[0004] However, in the related art, the tab is welded with the lead-out sheet at the inner side of the cover plate, and the heat radiation, splashing and the like in the welding process can easily cause damage to the core. SUMMARY

[0005] The technical problem to be solved by the present disclosure is that, in the related art, the tab is welded with the lead-out sheet at the inner side of the cover plate, and the heat radiation, splashing and the like in the welding process can easily cause damage to the core. The present disclosure provides a cover plate assembly, a battery and an electric device.

[0006] To solve the above technical problem, on the one hand, the present disclosure provides a cover plate assembly, which includes a cover plate and a cap independently arranged from the cover plate, the cover plate is provided with a cover plate through hole penetrating through the thickness direction of the cover plate, the bottom of the cap is fixed on the cover plate and closes one side of the cover plate through hole close to the cap, the cap protrudes from the cover plate in a direction away from the cover plate through hole, and the inside of the cap has a cap inner cavity in communication with the cover plate through hole.

[0007] According to the cover plate assembly of the embodiments of the present disclosure, the cap is independently arranged from the cover plate, and the inside of the cap has a cap inner cavity in communication with the cover plate through hole. In this way, the tab can be welded with the lead-out sheet after passing through the cover plate through hole, and after the tab is welded with the lead-out sheet, the cover plate through hole is closed by the cap, thereby optimizing the assembly process flow of the battery. The tab can be welded with the lead-out sheet after passing through the cover plate through hole, which can prevent damage to the core caused by heat radiation, splashing and the like in the welding process.

[0008] In addition, the cap inner cavity can accommodate at least part of the area of the welding position of the lead-out sheet and the tab, thereby reducing the occupation of the space in the shell for arranging the core by the lead-out sheet and the tab.

[0009] Optionally, the cap is a bottom-opened cap.

[0010] Optionally, a side of the cover plate close to the cap is provided with a connecting surface surrounding the through hole of the cover plate, and a bottom surface of the cap is fixedly attached to the connecting surface.

[0011] Optionally, the bottom surface of the cap is welded to the connecting surface.

[0012] Optionally, the through hole of the cover plate comprises a first section and a second section, and the second section is connected to a side of the first section away from the cap.

[0013] The hole wall of the second section is located inside the first section, so that the connecting surface is formed at the joint of the first section and the second section.

[0014] Optionally, the depth of the first section is less than the depth of the second section.

[0015] Optionally, the cap comprises a cap body and a rim, the cap body comprises a top plate and a side plate, the side plate is connected between the top plate and the rim, the rim is arranged around the bottom of the side plate, the bottom surface of the rim is the bottom surface of the cap, and the rim protrudes from the outer peripheral surface of the side plate in a direction away from the inner cavity of the cap.

[0016] The bottom surface of the rim is fixedly attached to the connecting surface.

[0017] Optionally, the cap body is a hollow square column, a hollow cylinder or a hollow elliptical column.

[0018] Optionally, the through hole of the cover plate is a square hole, a circular hole or an elliptical hole.

[0019] Optionally, the cross section of the cap parallel to the cover plate is a rectangle, the length of the cap is L, the width of the cap is H, and the width of the cap is greater than the height of the cap; then L is 10-2000 mm, and L / H=2-100.

[0020] Optionally, it further comprises a pole, and the cover plate is provided with a pole hole penetrating through the thickness direction of the cover plate on opposite sides.

[0021] The pole is arranged in the pole hole.

[0022] Optionally, the cover plate has a first surface and a second surface opposite in the thickness direction, and the first surface is closer to the top surface of the pole than the second surface.

[0023] The height of the cap is h1, the distance between the top surface of the pole and the first surface is h2; then, 3mm < h1 < 30mm, and 0 < h1 / h2 < 5.

[0024] Optionally, the cover plate is rectangular, the cover plate has a first edge and a second edge opposite along the length direction of the cover plate, and the pole is located between the cap and the first edge in the length direction of the cover plate.

[0025] The minimum distance between the outer edge of the cap and the outer edge of the pole is A, and the minimum distance between the pole and the first edge is B; then, 8mm ≤ A ≤ 300mm, and 0.2 ≤ A / B ≤ 50.

[0026] Optionally, it further comprises a lead-out sheet and an insulating plate, the insulating plate is attached to the side surface of the cover plate away from the cap, the insulating plate is provided with an insulating plate through hole and a pole through hole, the pole through hole is opposite to the pole hole, and the insulating plate through hole is opposite to the cover plate through hole; the lead-out sheet is in a strip shape, the lead-out sheet comprises a pole connecting part and a tab connecting part arranged along the length direction of the lead-out sheet, the pole connecting part is attached to the side surface of the insulating plate away from the cover plate and connected with the end of the pole away from the cap, and the tab connecting part is adapted to be connected with the tab of the pole core of the battery, and the connection position of the tab connecting part and the tab is wrapped with insulating glue.

[0027] The tab connecting part is arranged in the insulating plate through hole and the cover plate through hole and at least partially accommodated in the inner cavity of the cap, and the tab connecting part is spaced apart from the top plate of the cap.

[0028] Optionally, the end of the pole connecting part away from the tab connecting part is provided with a pole connecting hole, and the end of the pole away from the cap is welded in the pole connecting hole.

[0029] Optionally, it further comprises an explosion-proof valve, the cover plate is provided with explosion-proof valve holes opposite on the thickness direction of the cover plate, and the explosion-proof valve is arranged on the explosion-proof valve holes.

[0030] The insulating plate is provided with air holes opposite to the explosion-proof valve holes.

[0031] Optionally, the cover plate is rectangular, and along the length direction of the cover plate, the cap is located between the explosion-proof valve and the pole.

[0032] Optionally, it further comprises a liquid injection plugging piece, the cover plate is provided with liquid injection holes opposite on the thickness direction of the cover plate, and the liquid injection plugging piece is arranged on the liquid injection holes and closes the liquid injection holes.

[0033] The insulating plate is provided with a liquid injection via hole opposite to the liquid injection hole;

[0034] The cover plate is rectangular, and along the length direction of the cover plate, the cover cap is located between the liquid injection blocking piece and the pole column.

[0035] Optionally, a plurality of cover caps are provided, and a plurality of cover plate through holes are provided, the bottom of each cover cap is fixed on the cover plate and closes the corresponding cover plate through hole on the side close to the cover cap.

[0036] Optionally, the pole column is provided with two positive and negative pole columns, and the pole column hole is provided with two positive and negative pole column holes, the positive pole column is arranged in the positive pole column hole, and the negative pole column is arranged in the negative pole column hole.

[0037] Optionally, the insulating plate and the lead-out sheet are further included, the insulating plate is attached to the side surface of the cover plate away from the cover cap, the insulating plate is provided with two insulating plate through holes and two pole column through holes, the two pole column through holes are positive and negative pole column through holes respectively, the two insulating plate through holes are positive and negative insulating plate through holes respectively, the positive pole column through hole is opposite to the positive pole column hole, the negative pole column through hole is opposite to the negative pole column hole, the positive pole column is arranged in the positive pole column hole and the positive pole column through hole, and the negative pole column is arranged in the negative pole column hole and the negative pole column through hole; the cover cap is provided with two first and second cover caps, and the cover plate through hole is provided with two positive and negative cover plate through holes.

[0038] The lead-out sheet is provided with two positive and negative lead-out sheets, the positive and negative lead-out sheets are long strips, the positive lead-out sheet includes a positive pole column connecting part and a positive pole lug connecting part arranged along the length direction of the positive lead-out sheet, the positive pole column connecting part is attached to the side surface of the insulating plate away from the cover plate and connected with one end of the positive pole column away from the first cover cap, the positive pole lug connecting part is adapted to be connected with the positive pole lug of the pole core of the battery, and the connection position of the positive pole lug connecting part and the positive pole lug is wrapped with insulating glue; the negative lead-out sheet includes a negative pole column connecting part and a negative pole lug connecting part arranged along the length direction of the negative lead-out sheet, the negative pole column connecting part is attached to the side surface of the insulating plate away from the cover plate and connected with one end of the negative pole column away from the second cover cap, the negative pole lug connecting part is adapted to be connected with the negative pole lug of the pole core of the battery, and the connection position of the negative pole lug connecting part and the negative pole lug is wrapped with insulating glue.

[0039] The positive electrode tab connecting part is arranged in the positive electrode insulation plate through hole and the positive electrode cover plate through hole and at least partially accommodated in the cap inner cavity of the first cap, and the positive electrode tab connecting part is arranged in the top plate of the first cap.

[0040] Optionally, the cover plate is rectangular.

[0041] The positive electrode pole, the first cap, the negative electrode pole, and the second cap are sequentially arranged along the length direction of the cover plate, or the cover plate is rectangular, and the positive electrode pole, the first cap, the second cap, and the negative electrode pole are sequentially arranged along the length direction of the cover plate.

[0042] Optionally, the cover plate is rectangular, and the cover plate is provided with explosion-proof valve holes penetrating through the thickness direction of the cover plate on opposite sides, and the explosion-proof valve is arranged on the explosion-proof valve hole.

[0043] The positive electrode pole, the first cap, the negative electrode pole, the second cap, and the explosion-proof valve are sequentially arranged along the length direction of the cover plate, or the positive electrode pole, the first cap, the second cap, the negative electrode pole, and the explosion-proof valve are sequentially arranged along the length direction of the cover plate.

[0044] Optionally, the cover plate is rectangular, and the cover plate is provided with liquid injection holes penetrating through the thickness direction of the cover plate on opposite sides, and the liquid injection sealing piece is arranged on the liquid injection hole and closes the liquid injection hole.

[0045] The liquid injection sealing piece, the positive electrode pole, the first cap, the negative electrode pole, and the second cap are sequentially arranged along the length direction of the cover plate, or the liquid injection sealing piece, the positive electrode pole, the first cap, the second cap, and the negative electrode pole are sequentially arranged along the length direction of the cover plate.

[0046] Optionally, the cover plate is rectangular, and the cover plate is provided with explosion-proof valve holes and liquid injection holes penetrating through the thickness direction of the cover plate on opposite sides, and the explosion-proof valve is arranged on the explosion-proof valve hole, and the liquid injection sealing piece is arranged on the liquid injection hole and closes the liquid injection hole.

[0047] The liquid injection blocking member, the positive pole post, the first cap, the second cap, the negative pole post and the explosion-proof valve are arranged in sequence along the length direction of the cover plate.

[0048] In another aspect, the battery provided by the embodiments of the present disclosure includes a housing, a pole core, a positive cover plate assembly and a negative cover plate assembly. At least one of the positive cover plate assembly and the negative cover plate assembly is the cover plate assembly described above. The housing is a cylinder with two open ends. The cover plate of the positive cover plate assembly is fixed on one open end of the housing, and the cover plate of the negative cover plate assembly is fixed on the other open end of the housing, so as to form a sealed space inside the housing, the positive cover plate assembly and the negative cover plate assembly. The pole core is arranged in the sealed space.

[0049] In another aspect, the battery provided by the embodiments of the present disclosure includes a housing, a pole core and the cover plate assembly described above. The housing is a barrel with one open end. The cover plate of the cover plate assembly is fixed on the open end of the housing, so as to form a sealed space inside the housing and the cover plate assembly. The pole core is arranged in the sealed space.

[0050] In another aspect, the battery provided by the embodiments of the present disclosure includes a housing, a pole core and the cover plate assembly described above. The housing is a barrel with one open end. The cover plate of the cover plate assembly is fixed on the open end of the housing, so as to form a sealed space inside the housing and the cover plate assembly. The pole core is arranged in the sealed space.

[0051] The electric device can be, for example, a vehicle, an energy storage station, an aircraft or a ship. BRIEF DESCRIPTION OF DRAWINGS

[0052] FIG. 1 is a schematic view of the cover plate assembly provided by the first embodiment of the present disclosure;

[0053] FIG. 2 is an exploded view of the cover plate assembly provided by the first embodiment of the present disclosure;

[0054] FIG. 3 is a schematic view of the cap of the cover plate assembly provided by the first embodiment of the present disclosure;

[0055] FIG. 4 is a sectional view of the cover plate assembly provided by the first embodiment of the present disclosure, which is cut along a plane parallel to the cover plate;

[0056] FIG. 5 is a schematic view of the cover plate assembly provided by the second embodiment of the present disclosure;

[0057] FIG. 6 is an exploded view of the cover plate assembly provided by the second embodiment of the present disclosure;

[0058] FIG. 7 is a sectional view of the cover plate assembly provided by the second embodiment of the present disclosure, which is cut along a plane parallel to the cover plate;

[0059] FIG. 8 is an assembly schematic view of the cover plate assembly, the housing and the pole lug provided by the second embodiment of the present disclosure;

[0060] FIG. 9 is a schematic view of a cap of a cover assembly according to a third embodiment of the present disclosure;

[0061] FIG. 10 is a schematic view of a cover assembly according to a fourth embodiment of the present disclosure;

[0062] FIG. 11 is a schematic view of a battery according to a fifth embodiment of the present disclosure;

[0063] FIG. 12 is an enlarged view of a portion of an exploded view of the battery according to the fifth embodiment of the present disclosure, at a positive electrode cover assembly;

[0064] FIG. 13 is an enlarged view of a portion of an exploded view of the battery according to the fifth embodiment of the present disclosure, at a negative electrode cover assembly;

[0065] FIG. 14 is a schematic view of a cover assembly of a battery according to a sixth embodiment of the present disclosure;

[0066] FIG. 15 is a schematic view of a battery according to the sixth embodiment of the present disclosure;

[0067] FIG. 16 is an exploded view of the battery according to the sixth embodiment of the present disclosure;

[0068] FIG. 17 is a cross-sectional view of the battery according to the sixth embodiment of the present disclosure;

[0069] FIG. 18 is a schematic view of a cover assembly according to a seventh embodiment of the present disclosure;

[0070] FIG. 19 is a schematic view of a battery according to an eighth embodiment of the present disclosure;

[0071] FIG. 20 is a schematic view of a battery according to a ninth embodiment of the present disclosure.

[0072] The reference signs in the description are as follows: 10, cover plate assembly; 101, positive cover plate assembly; 102, negative cover plate assembly; 20, shell; 30, core; 301, tab; 3011, positive tab; 3012, negative tab; 1, cover plate; 11, cover plate through hole; 111, first section of cover plate through hole; 112, second section of cover plate through hole; 1101, positive cover plate through hole; 1102, negative cover plate through hole; 12, connecting surface; 13, pole hole; 131, positive pole hole; 132, negative pole hole; 14, first surface; 15, liquid injection hole; 16, explosion-proof valve hole; 2, cap; 201, first cap; 202, second cap; 21, cap body; 211, top plate; 212, side plate; 2121, first side plate; 2122, second side plate; 22, cap rim; 23, first edge; 24, second edge; 25, cap inner cavity; 3, pole; 31, positive pole; 32, negative pole; 4, tab; 41, pole connecting part; 411, pole connecting hole; 42, tab connecting part; 401, positive tab; 4011, positive pole connecting part; 4012, positive tab connecting part; 402, negative tab; 4021, negative pole connecting part; 4022, negative tab connecting part; 5, insulating plate; 51, insulating plate through hole; 511, positive insulating plate through hole; 512, negative insulating plate through hole; 52, pole via hole; 521, positive pole via hole; 522, negative pole via hole; 53, liquid injection via hole; 54, air hole; 6, liquid injection plugging piece; 61, plugging head; 62, plugging cover; 7, explosion-proof valve; 71, explosion-proof sheet; 72, protective sheet. DETAILED DESCRIPTION

[0073] In order to make the technical problems, technical solutions and beneficial effects solved by the present disclosure clearer, the present disclosure will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present disclosure and do not limit the present disclosure.

[0074] First embodiment

[0075] Referring to FIGS. 1-4, the cover plate assembly 10 provided by an embodiment of the present disclosure includes a cover plate 1 and a cap 2 arranged independently of the cover plate, the cap 2 is in the shape of a hat with an open bottom, the cover plate 1 is provided with a cover plate through hole 11 penetrating through the thickness direction of the cover plate 1 on opposite sides, the bottom of the cap 2 is fixed on the cover plate 1 and closes one side of the cover plate through hole 11 close to the cap 2, the cap 2 protrudes from the cover plate 1 in a direction away from the through hole of the cover plate 1, and the inside of the cap 2 has a cap inner cavity in communication with the cover plate through hole 11.

[0076] According to the cover plate assembly 10 of the embodiment of the present disclosure, the cover cap 2 is arranged independently of the cover plate 1, and the cover cap 2 has a cover cap inner cavity that is in communication with the cover plate through hole 11. In this way, the tab can be welded to the lead-out tab after passing through the cover plate through hole 11, and after the tab is welded to the lead-out tab, the cover plate through hole 11 is closed by the cover cap 2, thereby optimizing the assembly process flow of the battery. The tab can be welded to the lead-out tab after passing through the cover plate through hole 11, which can prevent damage to the pole core caused by heat radiation, splashing, and the like during welding.

[0077] In addition, the cover cap inner cavity can accommodate at least part of the welding position of the lead-out tab and the tab, thereby reducing the occupation of the space in the shell for arranging the pole core by the lead-out tab and the tab.

[0078] In addition, after the cover cap provides accommodation space for the tab of the battery, the filling amount of the pole core in the shell of the battery increases, and the total area of the active coating increases, thereby improving the shell space utilization rate of the battery. Based on this, the same size battery can carry more active coating, and the energy density of the battery is greatly improved.

[0079] In addition, compared with the prior art, the cover cap inner cavity can expand the internal space of the battery shell, and the cover cap inner cavity provides the battery with airflow circulation and storage space, so that the generated gas in the battery shell can be collected in the cover cap inner cavity, thereby slowing down the expansion of the battery.

[0080] The side of the cover plate 1 close to the cover cap 2 is provided with a connecting surface 12 arranged around the cover plate through hole 11, and the bottom surface of the cover cap 2 is fixedly attached to the connecting surface 12.

[0081] Preferably, the bottom surface of the cover cap 2 is welded to the connecting surface 12. The welding herein can be laser welding or ultrasonic welding. The material of the cover cap 2 can be metal materials such as aluminum and copper.

[0082] Referring to FIG. 2, the cover plate through hole 11 includes a cover plate through hole first section 111 and a cover plate through hole second section 112, and the cover plate through hole second section 112 is connected to the side of the cover plate through hole first section 111 away from the cover cap 2.

[0083] The hole wall of the cover plate through hole second section 112 is located on the inside of the cover plate through hole first section 111, so that the connecting surface 12 is formed at the joint between the cover plate through hole first section 111 and the cover plate through hole second section 112. The connecting surface 12 is a rectangular closed loop structure.

[0084] The depth of the cover plate through hole first section 111 is less than the depth of the cover plate through hole second section 112. That is, the thickness of the cover plate 1 at the connecting surface 13 is greater than the depth of the cover plate through hole first section 111, so as to ensure the welding strength.

[0085] Referring to FIGS. 1-3, the cap 2 comprises a cap body 21 and a brim 22, the cap body 21 comprises a top plate 211 and a side plate 212 connected between the top plate 211 and the brim 22, the brim 22 is arranged around the bottom of the side plate 212, the bottom surface of the brim 22 is the bottom surface of the cap 2, and the brim 22 protrudes from the outer circumferential surface of the side plate 212 in a direction away from the cap inner cavity; the bottom surface of the brim 22 is fixedly attached to the connecting surface 12.

[0086] In this embodiment, the cap body 21 is substantially a square column, the side plate 212 comprises a first side plate 2121, a second side plate 2122, a third side plate and a fourth side plate connected in sequence, the first side plate 2121 and the third side plate are opposite along the length direction of the cap body 21, and the second side plate 2122 and the fourth side plate are opposite along the width direction of the cap body 21. The connection between the first side plate 2121, the second side plate 2122, the third side plate, the fourth side plate and the top plate 211 is provided with a rounded corner.

[0087] The cover plate 1 is rectangular, and the cover plate through hole 11 is a square hole.

[0088] The horizontal cross section of the cap 2 parallel to the cover plate 1 is rectangular, the length L of the cap 2, the width H of the cap 2, the width of the cap 2 is greater than the height of the cap 2, the height of the cap 2 refers to the distance between the top surface and the bottom surface of the cap 2; then L is 10-2000mm, and L / H=2-100. The length of the cap 2 is 2-100 times the width, which can fully utilize the length space of the cover plate 1, so that the cap inner cavity has a larger volume. The length L of the cap 2 is less than the width of the battery, preferably, the length L of the cap 2 can be 50-500mm, for example, 200mm.

[0089] Further comprising a pole 3, the cover plate 1 is provided with a pole hole 13 penetrating through the thickness direction of the cover plate 1 on opposite sides; the pole 3 is arranged in the pole hole 13.

[0090] The cover plate 1 has a first surface 14 and a second surface opposite in the thickness direction thereof, the first surface 14 is closer to the top surface of the pole 3 relative to the second surface; the height of the cap 2 is h1, the distance between the top surface of the pole 3 and the first surface 14 is h2; then 3mm<h1<30mm, and 0<h1 / h2<5. In this way, the assembly interference during welding can be reduced and space can be provided for the battery module. Preferably, 0.5<h1 / h2≤1.5.

[0091] Further comprising a lead-out sheet 4 and an insulating plate 5 attached to the side surface of the cover plate 1 away from the cover cap 2, the insulating plate 5 is provided with an insulating plate through hole 51 and a pole post through hole 52, the pole post through hole 52 is arranged opposite to the pole post hole 13, the insulating plate through hole 51 is arranged opposite to the cover plate through hole 11, the lead-out sheet 4 is in a strip shape, the lead-out sheet 4 comprises a pole post connecting part 41 and a tab connecting part 42 arranged along the length direction thereof, the pole post connecting part 41 is attached to the side surface of the insulating plate 5 away from the cover plate 1 and connected with the end of the pole post 3 away from the cover cap 2, the tab connecting part 42 is adapted to be connected with the tab of the pole core of the battery, the connecting position of the tab connecting part 42 and the tab is wrapped with insulating glue, so as to realize the insulation of the connecting position of the tab connecting part 42 and the tab from the edge of the cover plate through hole 11 and the inner side surface of the cover cap 2.

[0092] The tab connecting part 42 is arranged spaced apart from the top plate 211 of the cover cap 2 and is arranged in the insulating plate through hole 51 and the cover plate through hole 11 and at least partially accommodated in the inner cavity of the cover cap.

[0093] Of course, the tab connecting part 42 can also be completely accommodated in the inner cavity of the cover cap.

[0094] The end of the pole post connecting part 41 away from the tab connecting part 42 is provided with a pole post connecting hole 411, and the end of the pole post 3 away from the cover cap 2 is welded in the pole post connecting hole 411.

[0095] Further comprising a liquid injection plugging piece 6, the cover plate 1 is provided with liquid injection holes 15 on opposite sides through the thickness direction of the cover plate 1, the liquid injection plugging piece 6 is arranged on the liquid injection hole 15 and closes the liquid injection hole 15; the insulating plate 5 is provided with a liquid injection through hole 53, the liquid injection through hole 53 is arranged opposite to the liquid injection hole 15.

[0096] Referring to FIG. 1, along the length direction of the cover plate 1, the cover cap 2 is located between the liquid injection plugging piece 6 and the pole post 3. The liquid injection plugging piece 6 is located at one end of the length direction of the cover plate 1, the pole post 3 is located at the other end of the length direction of the cover plate 1, and the cover cap 2 is arranged at the middle position and can have a larger length.

[0097] Referring to FIG. 2, the liquid injection plugging piece 6 comprises a plugging head 61 and a plugging cover 62, the plugging head 61 is press-fitted in the liquid injection hole 15, and the plugging cover 62 is welded and fixed on the cover plate 1 and covers the plugging head 61 and the liquid injection hole 15.

[0098] The cover plate 1 has a first edge 23 and a second edge 24 opposite to each other in the length direction of the cover plate 1, and the pole post 3 is located between the cover cap 2 and the first edge 23 in the length direction of the cover plate 1; in the length direction of the cover plate 1, the minimum distance between the cover cap 2 and the pole post 3 is A, and the minimum distance between the pole post 3 and the first edge 23 is B, then 8mm≤A≤300mm and 0.2≤A / B≤50.

[0099] Since the cover cap 2 and the cover plate 1 are welded by laser, when the cover cap 2 is welded by laser, high-temperature heat spread is generated, A<8mm, and the welding area will affect the pole post 3 (the pole post 3 is usually a ceramic pole post / injection molded pole post), the pole post 3 is easy to deform at high temperature, which may cause battery leakage and other risks. The design of 8mm≤A≤300mm can avoid the risk of battery leakage caused by the deformation of the pole post 3 at high temperature.

[0100] The cover plate 2 is provided with a cover plate through hole 11 with a large area, which affects the structural strength of the cover plate 2 and constitutes a weak area of the cover plate.

[0101] When A / B<0.2, the distance between the pole post 3 and the cover cap 2 is too close, the strength of the cover plate 1 in this area is too low, and defects are easy to form under the condition of bumping or swelling, which may cause battery leakage and corrosion.

[0102] When 50<A / B, the distance between the pole post 3 and the cover cap 2 is far, which increases the electron path, increases the internal resistance of the battery, increases the heat production, and increases the mass energy density and cost caused by the long structure.

[0103] Therefore, the design of 0.2≤A / B≤50 can avoid the risk of battery leakage and corrosion caused by defects under the condition of bumping or swelling, and can avoid the increase of the electron path caused by the distance between the pole post 3 and the cover cap 2 being too far, avoid the increase of the internal resistance of the battery leading to the increase of the heat production, and avoid the increase of the mass energy density and cost caused by the long structure.

[0104] The cover plate assembly 10 of the embodiment also has the following advantages:

[0105] (1) After the cover cap 2 provides a containing space for the tab of the battery, the filling amount of the pole core in the shell of the battery increases, and the total area of the active coating increases, so as to improve the space utilization rate of the shell of the battery, and since the height of the cover cap 2 is close to the height of the pole post 3, the size of the battery will not change greatly due to the increase of the cover cap 2. Based on this, the same size battery can carry more active coating, and the energy density of the battery is greatly improved.

[0106] (2) The tab can enter the cap inner cavity of the cap 2 through the cover plate through hole 11 and be gathered into a bundle in the cap 2, and the tab connecting part of the lead-out sheet 4 is welded in the cap inner cavity. The cap inner cavity allows the tab to have a longer stretching distance, reduces the bending of the tab caused by gathering in the shell, reduces the damage of the tab, and prevents the short circuit caused by the contact between the tab and the core surface under the condition that the tab is on the same side of the pole 3.

[0107] (3) In the preparation process of the battery, in order to improve the permeability of the electrolyte, 2-3 times of liquid injection process is often used. However, the space provided by the cap inner cavity of the cap 2 slows down the injection pressure and increases the amount of electrolyte injected at one time. The cap inner cavity can store a small amount of electrolyte and can prevent lithium precipitation caused by insufficient electrolyte infiltration.

[0108] The cover plate assembly 10 of the first embodiment can be used for a positive cover plate assembly and / or a negative cover plate assembly. Preferably, the cover plate assembly 10 of the first embodiment is used for a positive cover plate assembly.

[0109] Second embodiment

[0110] Referring to FIGS. 5-8, the cover plate assembly 10 provided by the second embodiment of the present disclosure is different from the first embodiment in that the liquid injection hole and the liquid injection plugging member are cancelled, and the explosion-proof valve 7 is added.

[0111] Specifically, the cover plate 1 is provided with explosion-proof valve holes 16 penetrating through the thickness direction of the cover plate 1 on opposite sides, and the explosion-proof valve 7 is arranged on the explosion-proof valve holes 16; the insulating plate 5 is provided with air holes 54, and the air holes 54 are arranged opposite to the explosion-proof valve holes 16. Along the length direction of the cover plate 1, the cap 2 is located between the explosion-proof valve 7 and the pole 3.

[0112] Referring to FIG. 6, the explosion-proof valve 7 includes an explosion-proof sheet 71 and a protection sheet 72, the explosion-proof sheet 71 is arranged on the explosion-proof valve hole 16, and the protection sheet 72 covers the outside of the explosion-proof sheet 71. The explosion-proof sheet 71 is provided with a weakening notch.

[0113] Since the cap 2 and the cover plate 1 are welded by laser, when the cap 2 is welded by laser, high-temperature heat spreads, A<8mm, and the welding area will affect the pole 3 (the pole 3 is usually a ceramic pole / injection molded pole). The pole 3 is easy to deform under high temperature, which may cause battery leakage and other risks. Design 8mm≤A≤300mm to avoid battery leakage and other risks caused by deformation of the pole 3 under high temperature.

[0114] The cover plate 2 is provided with a cover plate through hole 11 with a large area, which affects the structural strength of the cover plate 2 and constitutes a weak area of the cover plate.

[0115] When A / B < 0.2, the distance between the pole column 3 and the cap 2 is too close, the strength of the cover plate 1 in this area is too low, and defects are easily formed under the conditions of knocking or swelling, which leads to liquid leakage corrosion. Or, when gas is produced inside the battery, the weak area of the cover plate has a lower explosion pressure than the weak area of the explosion-proof valve (the area where the explosion-proof sheet 71 is located), which causes the explosion of other areas except the explosion-proof valve 7, and the high-temperature gas and electrolyte discharged affect the overall operation of the battery module. Therefore, effective control of A / B and reasonable distribution of the stress distribution of the cover plate 1 can ensure that the weak area except the explosion-proof valve 7 will not burst when the internal pressure of the battery reaches the preset value, so as to achieve the reliable explosion-proof effect of the explosion-proof valve 7, thereby improving the safety performance of the battery, and can ensure that the weak area of the explosion-proof valve will not burst when the internal pressure of the battery is lower than the preset value.

[0116] When 50 < A / B, the distance between the pole column 3 and the cap 2 is too far, which increases the electron path, increases the internal resistance of the battery, increases the heat production, and increases the mass energy density and cost due to the long structure.

[0117] Therefore, the design of 0.2≤A / B≤50 can avoid the defects caused by knocking or swelling, which leads to liquid leakage corrosion, and can also avoid the mis-bursting of the explosion-proof valve 7. On the other hand, it can avoid the distance between the pole column 3 and the cap 2 being too far, avoid increasing the electron path, avoid the increase in heat production caused by the increase in internal resistance of the battery, and avoid the increase in mass energy density and cost caused by the long structure.

[0118] Referring to FIG. 8, the cover plate 1 is welded on one end opening of the shell 20 of the battery, the tab connecting portion 42 is connected with the tab 301 of the pole core 30 of the battery, and the connection position of the tab connecting portion 42 and the tab 301 is wrapped with insulating glue to realize the insulation of the connection position of the tab connecting portion 42 and the tab 301 and the edge of the cover plate through hole 11 and the inner side surface of the cap 2. The tab connecting portion 42 is arranged in the insulating plate through hole 51 and the cover plate through hole 11 and at least partially accommodated in the inner cavity 25 of the cap, and the tab connecting portion 42 is spaced apart from the top plate 211 of the cap 2.

[0119] The cover plate assembly 10 of the second embodiment can be used in a positive cover plate assembly and / or a negative cover plate assembly. Preferably, the cover plate assembly 10 of the first embodiment is used in a negative cover plate assembly.

[0120] Third embodiment

[0121] Referring to FIG. 9, the cover plate assembly provided by the third embodiment of the present disclosure is different from the first embodiment in that the cap body 21 of the cap 2 is in the shape of a hollow elliptical column. That is, the top plate 211 of the cap body 21 is in the shape of a circle, the side wall 212 is in the shape of a cylinder, and the cap rim 22 is in the shape of a ring. The cover plate 1 is in the shape of a rectangle, the long axis of the cap body 21 extends along the length direction of the cover plate 1, the short axis of the cap body 21 extends along the width direction of the cover plate 1, and the height of the cap body 21 is less than the short axis of the cap body 21.

[0122] However, in other embodiments, the cap body 21 can also be in the shape of a hollow square column, a hollow cylinder, or other regular hollow column structures, or can also be in the shape of other irregular hollow column structures.

[0123] Fourth embodiment

[0124] Referring to FIG. 10, the cover plate assembly 10 provided by the fourth embodiment of the present disclosure is different from the first embodiment in that the cap 2 is provided with a plurality of (two in the figure) cap bodies, the cover plate 1 is provided with a plurality of through holes, and the bottom of each cap body 2 is fixed on the cover plate 1 and closes the corresponding cover plate through hole 11 on the side close to the cap 2.

[0125] The pole 3 is located between the two caps 2.

[0126] The cap inner cavities of the plurality of caps 2 have a large volume, which provides a large airflow circulation and storage space for the battery, so that the generated gas in the battery shell can be collected in the cap inner cavities, thereby slowing down the expansion of the battery.

[0127] Fifth embodiment

[0128] Referring to FIGS. 11-13, the battery provided by the fifth embodiment of the present disclosure includes a shell 20, a pole core 30, a positive electrode cover plate assembly 101, and a negative electrode cover plate assembly 102. The positive electrode cover plate assembly 101 is the cover plate assembly 10 described in the first embodiment, the negative electrode cover plate assembly 102 is the cover plate assembly 10 described in the second embodiment, the shell 20 is in the shape of a cylinder with two open ends, the cover plate 1 of the positive electrode cover plate assembly 101 is fixed on one open end of the shell 20, the cover plate 1 of the negative electrode cover plate assembly 102 is fixed on the other open end of the shell 20, so as to form a sealed space inside the shell 20, the positive electrode cover plate assembly 101, and the negative electrode cover plate assembly 102, and the pole core 30 is arranged in the sealed space.

[0129] One end of the pole core 30 leads out a positive electrode tab 3011, and the other end leads out a negative electrode tab 3012. The positive electrode tab 3011 is welded to the tab connecting portion 42 of the lead-out sheet 4 of the positive electrode cover plate assembly 101, and the negative electrode tab 3012 is welded to the tab connecting portion 42 of the lead-out sheet 4 of the negative electrode cover plate assembly 102.

[0130] Sixth embodiment

[0131] Referring to FIGS. 14-17, the sixth embodiment of the present disclosure provides a battery, which is different from the fifth embodiment in that the pole post 3 is provided with two, i.e. a positive pole post 31 and a negative pole post 32, and the cover plate assembly 10 simultaneously leads out the positive pole post 31 and the negative pole post 32 on one side. The pole post hole 13 is provided with two, i.e. a positive pole post hole 131 and a negative pole post hole 132, the positive pole post 31 is arranged in the positive pole post hole 131, and the negative pole post 32 is arranged in the negative pole post hole 132.

[0132] Further comprising an insulating plate 5 and a lead-out sheet 4, the insulating plate 5 is attached to the surface of the cover plate 1 away from the cover cap 2, the insulating plate 5 is provided with two insulating plate through holes 51 and two pole post vias 52, two of the pole post vias 52 are a positive pole post via 521 and a negative pole post via 522, and two of the insulating plate through holes 51 are a positive insulating plate through hole 511 and a negative insulating plate through hole 512, the positive pole post via 521 is arranged opposite to the positive pole post hole 131, the negative pole post via 522 is arranged opposite to the negative pole post hole 132, the positive pole post 31 is arranged in the positive pole post hole 131 and the positive pole post via 521, and the negative pole post 32 is arranged in the negative pole post hole 132 and the negative pole post via 522; the cover cap 2 is provided with two, i.e. a first cover cap 201 and a second cover cap 202, and the cover plate through hole 11 is provided with two, i.e. a positive cover plate through hole 1101 and a negative cover plate through hole 1102.

[0133] The lead-out sheet 4 is provided with two positive and negative lead-out sheets 401 and 402, which are in the shape of a long strip. The positive lead-out sheet 401 includes a positive pole post connecting portion 4011 and a positive tab connecting portion 4012 arranged along the length direction thereof. The positive pole post connecting portion 4011 is attached to the side surface of the insulating plate 5 away from the cover plate 1 and connected to the end of the positive pole post 31 away from the first cover cap 201. The positive tab connecting portion 4011 is adapted to be connected to the positive tab 3011 of the pole core 30 of the battery, and the connection position of the positive tab connecting portion 4011 and the positive tab 3011 is wrapped with insulating glue. The negative lead-out sheet 402 includes a negative pole post connecting portion 4021 and a negative tab connecting portion 4022 arranged along the length direction thereof. The negative pole post connecting portion 4021 is attached to the side surface of the insulating plate 5 away from the cover plate 1 and connected to the end of the negative pole post 32 away from the second cover cap 202. The negative tab connecting portion 4021 is adapted to be connected to the negative tab 3012 of the pole core 30 of the battery, and the connection position of the negative tab connecting portion 4022 and the negative tab 3012 is wrapped with insulating glue.

[0134] The positive tab connecting portion 4012 is arranged through the positive insulating plate through hole 511 and the positive cover plate through hole 1101 and at least partially accommodated in the cap inner cavity 25 of the first cover cap 201, and the positive tab connecting portion 4012 is arranged in a spaced manner with the top plate of the first cover cap 201. The negative tab connecting portion 4022 is arranged through the negative insulating plate through hole 512 and the negative cover plate through hole 1102 and at least partially accommodated in the cap inner cavity 25 of the second cover cap 202, and the negative tab connecting portion 4022 is arranged in a spaced manner with the top plate of the second cover cap 202.

[0135] The cover plate 1 is in the shape of a rectangle. Along the length direction of the cover plate 1, the positive pole post 31, the first cover cap 201, the negative pole post 32 and the second cover cap 202 are arranged in sequence.

[0136] An explosion-proof valve 7 is further included. The cover plate 1 is provided with explosion-proof valve holes 16 on opposite sides through the thickness direction of the cover plate 1. The explosion-proof valve 7 is arranged on the explosion-proof valve holes 16. The insulating plate 5 is provided with air holes 54, which are arranged opposite to the explosion-proof valve holes 16. Along the length direction of the cover plate 1, the positive pole post 31, the first cover cap 201, the negative pole post 32, the second cover cap 202 and the explosion-proof valve 7 are arranged in sequence.

[0137] The cover plate 1 is provided with injection holes 15 on opposite sides of the thickness direction of the cover plate 1, and the injection plugs 6 are arranged on the injection holes 15 and seal the injection holes 15. The insulating plate 5 is provided with injection vias 53, and the injection vias 53 are arranged opposite to the injection holes 15. Referring to FIG. 14, along the length direction of the cover plate 1, the injection plugs 6, the positive pole 31, the first cover cap 201, the negative pole 32, the second cover cap 202, and the explosion-proof valve 7 are sequentially arranged.

[0138] Seventh embodiment

[0139] Referring to FIG. 18, the seventh embodiment of the present disclosure provides a cover plate assembly 10, which is different from the cover plate assembly 10 of the sixth embodiment in that, along the length direction of the cover plate 1, the injection holes 15, the positive pole 31, the first cover cap 201, the second cover cap 202, the negative pole 32, and the explosion-proof valve 7 are sequentially arranged.

[0140] Eighth embodiment

[0141] Referring to FIG. 19, the eighth embodiment of the present disclosure provides a battery, which is mainly different from the fifth embodiment shown in FIG. 11 in that the negative cover plate assembly 102 adopts a conventional cover plate assembly. Here, the conventional cover plate assembly refers to a cover plate assembly without cover caps.

[0142] Compared with the fifth embodiment, the manufacturing cost can be reduced.

[0143] Ninth embodiment

[0144] Referring to FIG. 20, the ninth embodiment of the present disclosure provides a battery, which is mainly different from the fifth embodiment shown in FIG. 11 in that the positive cover plate assembly 101 adopts a conventional cover plate assembly. Here, the conventional cover plate assembly refers to a cover plate assembly without cover caps.

[0145] Compared with the fifth embodiment, the manufacturing cost can be reduced.

[0146] In addition, the embodiments of the present disclosure provide an electrical equipment including the battery of the above-mentioned embodiments. A plurality of batteries can form a battery module or a battery module. The battery module or the battery module can form a battery pack.

[0147] The electrical equipment may, for example, be a vehicle, an energy storage power station, an aircraft, a ship, and the like.

[0148] The above merely provides the preferred embodiments of the present disclosure but does not limit the present disclosure. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present disclosure shall fall within the protection scope of the present disclosure.

Claims

1. A cover plate assembly, comprising a cover plate (1) and a cover cap (2) arranged separately from the cover plate (1), the cover plate (1) being provided with a cover plate through hole (11) penetrating through the cover plate (1) in a thickness direction, a bottom of the cover cap (2) being fixed on the cover plate (1) and closing the cover plate through hole (11) on a side close to the cover cap (2), the cover cap (2) being protruded from the cover plate (1) in a direction away from the cover plate through hole (11), and an inner part of the cover cap (2) having a cover cap inner cavity (25) in communication with the cover plate through hole (11). 2.The cover plate assembly according to claim 1, wherein the cover cap (2) is in a form of a cap with an open bottom. 3.The cover plate assembly according to claim 1, wherein the cover plate (1) is provided with a connecting surface (12) arranged around the cover plate through hole (11) on a side close to the cover cap (2), and a bottom surface of the cover cap (2) is fixedly attached to the connecting surface (12). 4.The cover plate assembly according to claim 3, wherein the bottom surface of the cover cap (2) is welded to the connecting surface (12). 5.The cover plate assembly according to claim 3, wherein the cover plate through hole (11) comprises a cover plate through hole first section (111) and a cover plate through hole second section (112), the cover plate through hole second section (112) being connected to the cover plate through hole first section (111) on a side away from the cover cap (2), and a hole wall of the cover plate through hole second section (112) is located entirely inside the cover plate through hole first section (111), so that the connecting surface (12) is formed at a joint between the cover plate through hole first section (111) and the cover plate through hole second section (112). 6.The cover plate assembly according to claim 5, wherein a depth of the cover plate through hole first section (111) is less than a depth of the cover plate through hole second section (112). 7.The cover plate assembly according to claim 3, wherein the cover cap (2) comprises a cover cap main body (21) and a cap rim (22), the cover cap main body (21) comprising a top plate (211) and a side wall (212), the side wall (212) being connected between the top plate (211) and the cap rim (22), the cap rim (22) being arranged around a bottom of the side wall (212), a bottom surface of the cap rim (22) being a bottom surface of the cover cap (2), and the cap rim (22) being protruded from an outer peripheral surface of the side wall (212) in a direction away from the cover cap inner cavity (25). 8.The cover plate assembly according to claim 7, wherein the cover cap main body (21) is in a form of a hollow square column, a hollow circular column or a hollow elliptical column. 9.The cover plate assembly according to claim 1, wherein the cover plate through hole (11) is a square hole, a circular hole or an elliptical hole. ​ ​ 10. The cover plate assembly according to claim 1, wherein a cross section of the cover cap (2) parallel to the cover plate (1) is rectangular, a length of the cover cap (2) is L, a width of the cover cap (2) is H, and the width of the cover cap (2) is greater than the height of the cover cap (2); L is 10-2000 mm, and L / H=2-100.

11. The cover plate assembly according to claim 1, further comprising a pole post (3), wherein the cover plate (1) is provided with pole post holes (13) on opposite sides of the cover plate (1) in a thickness direction of the cover plate (1); and the pole post (3) is arranged in the pole post holes (13).

12. The cover plate assembly according to claim 11, wherein the cover plate (1) has a first surface (14) and a second surface opposite in a thickness direction of the cover plate (1), and the first surface (14) is closer to a top surface of the pole post (3) than the second surface; a height of the cover cap (2) is h1, and a distance between the top surface of the pole post (3) and the first surface (14) is h2; 3 mm < h1 < 30 mm, and 0 < h1 / h2 < 5.

13. The cover plate assembly according to claim 11, wherein the cover plate (1) is rectangular, the cover plate (1) has a first edge (23) and a second edge (24) opposite in a length direction of the cover plate (1), and the pole post (3) is located between the cover cap (2) and the first edge (23) in the length direction of the cover plate (1); a minimum distance between an outer edge of the cover cap (2) and an outer edge of the pole post (3) is A, and a minimum distance between the pole post (3) and the first edge (23) is B; 8 mm ≤ A ≤ 300 mm, and 0.2 ≤ A / B ≤ 50.

14. The cover plate assembly according to claim 11, further comprising a lead-out sheet (4) and an insulating plate (5), wherein the insulating plate (5) is attached to a side surface of the cover plate (1) away from the cover cap (2), the insulating plate (5) is provided with an insulating plate through hole (51) and a pole post via hole (52), the pole post via hole (52) is arranged opposite to the pole post hole (13), the insulating plate through hole (51) is arranged opposite to the cover plate through hole (11), the lead-out sheet (4) is strip-shaped, the lead-out sheet (4) comprises a pole post connecting portion (41) and a tab connecting portion (42) arranged in a length direction of the lead-out sheet (4), the pole post connecting portion (41) is attached to a side surface of the insulating plate (5) away from the cover plate (1) and connected to an end of the pole post (3) away from the cover cap (2), the tab connecting portion (42) is adapted to be connected to a tab (301) of a pole core (30) of a battery, and a connection position of the tab connecting portion (42) and the tab (301) is wrapped with insulating glue; the tab connecting portion (42) is arranged in the insulating plate through hole (51) and the cover plate through hole (11) and at least partially accommodated in the inner cavity (25) of the cover cap, and the tab connecting portion (42) is arranged spaced apart from a top plate (211) of the cover cap (2). ​ ​ ​ ​ 15. The cover plate assembly according to claim 14, wherein the pole post connecting portion (41) is provided with a pole post connecting hole (411) at one end away from the tab connecting portion (42), and the pole post (3) is welded into the pole post connecting hole (411) at one end away from the cover cap (2).

16. The cover plate assembly according to claim 14, further comprising an explosion-proof valve (7), wherein the cover plate (1) is provided with explosion-proof valve holes (16) on opposite sides through the thickness direction of the cover plate (1), and the explosion-proof valve (7) is arranged on the explosion-proof valve holes (16). The insulating plate (5) is provided with air holes (54) opposite to the explosion-proof valve holes (16).

17. The cover plate assembly according to claim 16, wherein the cover plate (1) is rectangular, and the cover cap (2) is located between the explosion-proof valve (7) and the pole post (3) along the length direction of the cover plate (1).

18. The cover plate assembly according to claim 14, further comprising a liquid injection blocking piece (6), wherein the cover plate (1) is provided with liquid injection holes (15) on opposite sides through the thickness direction of the cover plate (1), and the liquid injection blocking piece (6) is arranged on the liquid injection holes (15) and closes the liquid injection holes (15). The insulating plate (5) is provided with liquid injection vias (53) opposite to the liquid injection holes (15). The cover plate (1) is rectangular, and the cover cap (2) is located between the liquid injection blocking piece (6) and the pole post (3) along the length direction of the cover plate (1).

19. The cover plate assembly according to claim 1, wherein a plurality of cover caps (2) are provided, and a plurality of cover plate through holes (11) are provided, and the bottom of each cover cap (2) is fixed on the cover plate (1) and closes the corresponding cover plate through hole (11) on the side close to the cover cap (2).

20. The cover plate assembly according to claim 11, wherein two pole posts (3) are provided, which are a positive pole post (31) and a negative pole post (32), and two pole post holes (13) are provided, which are a positive pole post hole (131) and a negative pole post hole (132), and the positive pole post (31) is arranged in the positive pole post hole (131), and the negative pole post (32) is arranged in the negative pole post hole (132).

21. The cover plate assembly according to claim 20, further comprising an insulation plate (5) and a lead-out sheet (4), the insulation plate (5) being attached to a side surface of the cover plate (1) away from the cover cap (2), the insulation plate (5) being provided with two insulation plate through holes (51) and two pole post through holes (52), the two pole post through holes (52) being a positive pole post through hole (521) and a negative pole post through hole (522) respectively, the two insulation plate through holes (51) being a positive insulation plate through hole (511) and a negative insulation plate through hole (512) respectively, the positive pole post through hole (521) being arranged opposite to the positive pole post hole (131), the negative pole post through hole (522) being arranged opposite to the negative pole post hole (132), the positive pole post (31) being arranged through the positive pole post hole (131) and the positive pole post through hole (521), the negative pole post (32) being arranged through the negative pole post hole (132) and the negative pole post through hole (522); the cover cap (2) being provided with two cover caps (201) and (202), the cover plate through hole (11) being provided with a positive cover plate through hole (1101) and a negative cover plate through hole (1102); the lead-out sheet (4) being provided with a positive lead-out sheet (401) and a negative lead-out sheet (402), the positive lead-out sheet (401) and the negative lead-out sheet (402) being in a strip shape, the positive lead-out sheet (401) comprising a positive pole post connecting portion (4011) and a positive pole lug connecting portion (4012) arranged along a length direction thereof, the positive pole post connecting portion (4011) being attached to a side surface of the insulation plate (5) away from the cover plate (1) and connected to an end of the positive pole post (31) away from the first cover cap (201), the positive pole lug connecting portion (4012) being adapted to be connected to a positive pole lug (3011) of a pole core (30) of a battery, a connection position of the positive pole lug connecting portion (4012) and the positive pole lug (3011) being wrapped with insulation glue; the negative lead-out sheet (402) comprising a negative pole post connecting portion (4021) and a negative pole lug connecting portion (4022) arranged along a length direction thereof, the negative pole post connecting portion (4021) being attached to a side surface of the insulation plate (5) away from the cover plate (1) and connected to an end of the negative pole post (32) away from the second cover cap (202), the negative pole lug connecting portion (4022) being adapted to be connected to a negative pole lug (3012) of the pole core (30) of the battery, a connection position of the negative pole lug connecting portion (4022) and the negative pole lug (3012) being wrapped with insulation glue. The positive tab connecting part (4012) is arranged through the positive insulating plate through hole (511) and the positive cover plate through hole (1101) and at least partially accommodated in the cap inner cavity (25) of the first cap (201), and the positive tab connecting part (4012) is arranged spaced apart from the top plate (211) of the first cap (201); the negative tab connecting part (4022) is arranged through the positive insulating plate through hole (511) and the negative cover plate through hole (1102) and at least partially accommodated in the cap inner cavity (25) of the second cap (202), and the negative tab connecting part (4022) is arranged spaced apart from the top plate (211) of the second cap (202).

22. The cover plate assembly according to claim 21, wherein the cover plate (1) is rectangular. Along the length direction of the cover plate (1), the positive tab (31), the first cap (201), the negative tab (32) and the second cap (202) are arranged in sequence; or, the cover plate (1) is rectangular, and along the length direction of the cover plate (1), the positive tab (31), the first cap (201), the second cap (202) and the negative tab (32) are arranged in sequence.

23. The cover plate assembly according to claim 21, further comprising an explosion-proof valve (7), the cover plate (1) is provided with an explosion-proof valve hole (16) penetrating through the thickness direction of the cover plate (1) on opposite sides, the explosion-proof valve (7) is arranged on the explosion-proof valve hole (16), and the cover plate (1) is rectangular; the insulating plate (5) is provided with a gas hole (54) opposite to the explosion-proof valve hole (16); Along the length direction of the cover plate (1), the positive tab (31), the first cap (201), the negative tab (32), the second cap (202) and the explosion-proof valve (7) are arranged in sequence; or, along the length direction of the cover plate (1), the positive tab (31), the first cap (201), the second cap (202), the negative tab (32) and the explosion-proof valve (7) are arranged in sequence.

24. The cover plate assembly according to claim 21, further comprising a liquid injection blocking piece (6), the cover plate (1) is provided with a liquid injection hole (15) penetrating through the thickness direction of the cover plate (1) on opposite sides, the liquid injection blocking piece (6) is arranged on the liquid injection hole (15) and closes the liquid injection hole (15), and the cover plate (1) is rectangular; the insulating plate (5) is provided with a liquid injection via hole (53) opposite to the liquid injection hole (15); Along the length direction of the cover plate (1), the liquid injection blocking piece (6), the positive tab (31), the first cap (201), the negative tab (32) and the second cap (202) are arranged in sequence; or, along the length direction of the cover plate (1), the liquid injection blocking piece (6), the positive tab (31), the first cap (201), the second cap (202) and the negative tab (32) are arranged in sequence.

25. The cover plate assembly of claim 21, further comprising an explosion-proof valve (7) and a liquid injection blocking member (6), the cover plate (1) being provided with an explosion-proof valve hole (16) and a liquid injection hole (15), the explosion-proof valve hole (16) and the liquid injection hole (15) penetrating through opposite sides of the thickness direction of the cover plate (1), the explosion-proof valve (7) being arranged on the explosion-proof valve hole (16), and the liquid injection blocking member (6) being arranged on the liquid injection hole (15) and blocking the liquid injection hole (15), the cover plate (1) being rectangular; the insulation plate (5) being provided with a gas hole (54) arranged opposite to the explosion-proof valve hole (16); and the insulation plate (5) being provided with a liquid injection via hole (53) arranged opposite to the liquid injection hole (15). The liquid injection blocking member (6), the positive electrode post (31), the first cap (201), the negative electrode post (32), the second cap (202) and the explosion-proof valve (7) are arranged in sequence along the length direction of the cover plate (1), or the liquid injection blocking member (6), the positive electrode post (31), the first cap (201), the second cap (202), the negative electrode post (32) and the explosion-proof valve (7) are arranged in sequence along the length direction of the cover plate (1).

26. A battery comprising a shell (20), a pole core (30), a positive electrode cover plate assembly (101) and a negative electrode cover plate assembly (102), at least one of the positive electrode cover plate assembly (101) and the negative electrode cover plate assembly (102) being the cover plate assembly of any one of claims 1-20, the shell (20) being a cylinder with both ends open, the cover plate (1) of the positive electrode cover plate assembly (101) being fixed on one end opening of the shell (20), and the cover plate (1) of the negative electrode cover plate assembly (102) being fixed on the other end opening of the shell (20) to form a sealed space inside the shell (20), the positive electrode cover plate assembly (101) and the negative electrode cover plate assembly (102), and the pole core (30) being arranged in the sealed space.

27. A battery comprising a shell (20), a pole core (30) and the cover plate assembly of any one of claims 21-25, the shell (20) being a barrel with one end open, the cover plate (1) of the cover plate assembly (10) being fixed on the opening of the shell (20) to form a sealed space inside the shell (20) and the cover plate assembly (10), and the pole core (30) being arranged in the sealed space.

28. An electrical device comprising the battery of claim 26 or 27.

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