Cover plate assembly, battery and electric equipment

Abstract

The utility model relates to a cover plate assembly, battery and electric equipment, the cover plate assembly comprises a cover plate and a cap which is independent of the cover plate, the cover plate is provided with a cover plate through hole which penetrates through two opposite sides of the cover plate in the thickness direction; the bottom of the cover cap is fixed to the cover plate and seals the side, close to the cover cap, of the cover plate through hole, the cover cap protrudes out of the cover plate in the direction away from the cover plate through hole, and a cover cap inner cavity communicated with the cover plate through hole is formed in the cover cap. According to the cover plate assembly provided by the embodiment of the utility model, the cover cap is independent of the cover plate. Therefore, the tab can penetrate through the through hole of the cover plate and then is welded with the lead-out sheet, and after the tab and the lead-out sheet are welded, the through hole of the cover plate is sealed by the cover cap, so that the assembly process flow of the battery is optimized. The tab can penetrate through the through hole of the cover plate and then is welded with the lead-out sheet, so that the damage to the pole core caused by heat radiation, splashing and the like in the welding process can be prevented.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and relates to a cover plate assembly, a battery and an electrical equipment. Background Art

[0002] In the related art, a battery includes a cover plate assembly, a housing and a pole core. The cover plate assembly includes a cover plate, a pole column and a lead-out piece. The housing is in a barrel shape with one end open. The cover plate of the cover plate assembly is fixed at the opening of the housing to form a sealed space inside the two. The pole core is arranged in the sealed space. The pole tab of the pole core is welded to the lead-out piece, and the lead-out piece is welded to the pole column.

[0003] However, in the related art, the pole tab is welded to the lead-out piece inside the cover plate. During the welding process, heat radiation, spatter, etc. of the welding are likely to cause damage to the pole core. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is: aiming at the problem that in the related art, the pole tab is welded to the lead-out piece inside the cover plate, and the pole core is likely to be damaged during the welding process, a cover plate assembly, a battery and an electrical equipment are provided.

[0005] To solve the above technical problem, on the one hand, the utility model provides a cover plate assembly, which includes a cover plate and a cap arranged independently of the cover plate. A cover plate through hole penetrating through opposite sides in the thickness direction of the cover plate is arranged on 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. The inside of the cap has a cap inner cavity communicated with the cover plate through hole.

[0006] According to the cover plate assembly of the embodiment of the utility model, the cap is arranged independently of the cover plate, and the inside of the cap has a cap inner cavity communicated with the cover plate through hole. In this way, the pole tab can pass through the cover plate through hole and then be welded to the lead-out piece. After the pole tab and the lead-out piece are welded, the cover plate through hole is closed by the cap, optimizing the battery assembly process flow. The pole tab can pass through the cover plate through hole and then be welded to the lead-out piece, which can prevent damage to the pole core caused by heat radiation, spatter, etc. during the welding process.

[0007] In addition, the cap inner cavity can accommodate at least part of the welding position of the lead-out piece and the pole tab, reducing the occupation of the space in the housing for arranging the pole core by the lead-out piece and the pole tab.

[0008] Optionally, the cap is in a cap shape with an open bottom.

[0009] Optionally, a connecting surface surrounding the cover plate through hole in a circle is arranged on one side of the cover plate close to the cap, and the bottom surface of the cap is fixedly attached to the connecting surface.

[0010] Optionally, the bottom surface of the cap is welded to the connection surface.

[0011] Optionally, the cover plate through-hole includes a first section and a second section of the cover plate through-hole. The second section of the cover plate through-hole is connected to a side of the first section of the cover plate through-hole away from the cap.

[0012] The hole wall of the second section of the cover plate through-hole is entirely located inside the first section of the cover plate through-hole, so that the connection surface is formed at the junction of the first section and the second section of the cover plate through-hole.

[0013] Optionally, the depth of the first section of the cover plate through-hole is less than the depth of the second section of the cover plate through-hole.

[0014] Optionally, the cap includes a cap body and a brim. The cap body includes a top plate and a side wall. The side wall is connected between the top plate and the brim. The brim is disposed around the bottom of the side wall in a circle. The bottom surface of the brim is the bottom surface of the cap. The brim protrudes from the outer peripheral surface of the side wall in a direction away from the inner cavity of the cap.

[0015] The bottom surface of the brim is fitted and fixed to the connection surface.

[0016] Optionally, the cap body is in the shape of a hollow square column, a hollow cylindrical column or a hollow elliptical column.

[0017] Optionally, the cover plate through-hole is a square hole, a circular hole or an elliptical hole.

[0018] Optionally, the cross-section of the cap parallel to the cover plate is rectangular. 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.

[0019] Optionally, it further includes a terminal post. The cover plate is provided with terminal post holes penetrating through opposite sides in the thickness direction of the cover plate.

[0020] The terminal post is inserted into the terminal post holes.

[0021] Optionally, the cover plate has a first surface and a second surface opposite to each other in its thickness direction. The first surface is closer to the top surface of the terminal post than the second surface.

[0022] The height of the cap is h1, and the distance between the top surface of the terminal post and the first surface is h2. Then, 3 mm < h1 < 30 mm, and 0 < h1 / h2 < 5.

[0023] Optionally, the cover plate is rectangular, the cover plate has a first edge and a second edge opposite to each other along its length direction, and the pole column is located between the cap and the first edge in the length direction of the cover plate;

[0024] The minimum distance between the outer edge of the cap and the outer edge of the pole column is A, and the minimum distance between the pole column and the first edge is B. Then, 8mm ≤ A ≤ 300mm, and 0.2 ≤ A / B ≤ 50.

[0025] Optionally, it further includes a lead-out sheet and an insulating plate. The insulating plate is attached to the surface of the cover plate away from the cap. The insulating plate is provided with an insulating plate through-hole and a pole-column through-hole. The pole-column through-hole is arranged opposite to the pole-column hole, and the insulating plate through-hole is arranged opposite to the cover plate through-hole. The lead-out sheet is strip-shaped, and the lead-out sheet includes a pole-column connecting part and an ear connecting part arranged along its length direction. The pole-column connecting part is attached to the surface of the insulating plate away from the cover plate and is connected to the end of the pole column away from the cap. The ear connecting part is adapted to be connected to the ear of the electrode core of the battery, and the connection position between the ear connecting part and the ear is wrapped with insulating glue;

[0026] The ear connecting part passes through the insulating plate through-hole and the cover plate through-hole and is at least partially accommodated in the inner cavity of the cap. The ear connecting part is spaced from the top plate of the cap.

[0027] Optionally, a pole-column connecting hole is provided at one end of the pole-column connecting part away from the ear connecting part, and the end of the pole column away from the cap is welded in the pole-column connecting hole.

[0028] Optionally, it further includes an explosion-proof valve. The cover plate is provided with an explosion-proof valve hole penetrating through opposite sides in the thickness direction of the cover plate, and the explosion-proof valve is arranged on the explosion-proof valve hole;

[0029] The insulating plate is provided with an air hole, and the air hole is arranged opposite to the explosion-proof valve hole.

[0030] Optionally, the cover plate is rectangular. Along the length direction of the cover plate, the cap is located between the explosion-proof valve and the pole column.

[0031] Optionally, it further includes a liquid injection plugging member. The cover plate is provided with a liquid injection hole penetrating through opposite sides in the thickness direction of the cover plate, and the liquid injection plugging member is arranged on the liquid injection hole and closes the liquid injection hole;

[0032] The insulating plate is provided with a liquid injection through-hole, and the liquid injection through-hole is arranged opposite to the liquid injection hole;

[0033] The cover plate is rectangular. Along the length direction of the cover plate, the cap is located between the liquid injection plugging member and the pole column.

[0034] Optionally, a plurality of the caps are provided, and a plurality of the cover plate through holes are provided. The bottom of each cap is fixed on the cover plate and closes one side of the corresponding cover plate through hole close to the cap.

[0035] Optionally, two pole columns are provided, namely a positive pole column and a negative pole column. Two pole column holes are provided, namely a positive pole column hole and a negative pole column hole. The positive pole column passes through the positive pole column hole, and the negative pole column passes through the negative pole column hole.

[0036] Optionally, an insulating plate and lead-out pieces are further included. The insulating plate is attached to the surface of the cover plate away from the cap. Two insulating plate through holes and two pole column through holes are provided on the insulating plate. The two pole column through holes are respectively a positive pole column through hole and a negative pole column through hole. The two insulating plate through holes are respectively a positive insulating plate through hole and a negative insulating plate through hole. The positive pole column through hole is arranged opposite to the positive pole column hole, and the negative pole column through hole is arranged opposite to the negative pole column hole. The positive pole column passes through the positive pole column hole and the positive pole column through hole, and the negative pole column passes through the negative pole column hole and the negative pole column through hole; Two caps are provided, namely a first cap and a second cap. Two cover plate through holes are provided, namely a positive cover plate through hole and a negative cover plate through hole;

[0037] Two lead-out pieces are provided, namely a positive lead-out piece and a negative lead-out piece. The positive lead-out piece and the negative lead-out piece are strip-shaped. The positive lead-out piece includes a positive pole column connection part and a positive pole tab connection part arranged along its length direction. The positive pole column connection part is attached to the surface of the insulating plate away from the cover plate and is connected to the end of the positive pole column away from the first cap. The positive pole tab connection part is adapted to be connected to the positive pole tab of the battery cell. The connection position between the positive pole tab connection part and the positive pole tab is wrapped with insulating glue; The negative lead-out piece includes a negative pole column connection part and a negative pole tab connection part arranged along its length direction. The negative pole column connection part is attached to the surface of the insulating plate away from the cover plate and is connected to the end of the negative pole column away from the second cap. The negative pole tab connection part is adapted to be connected to the negative pole tab of the battery cell. The connection position between the negative pole tab connection part and the negative pole tab is wrapped with insulating glue;

[0038] The positive electrode tab connecting part passes through the through holes of the positive electrode insulating plate and the positive electrode cover plate and is at least partially accommodated in the cap inner cavity of the first cap, and the positive electrode tab connecting part is spaced from the top plate of the first cap; the negative electrode tab connecting part passes through the through holes of the positive electrode insulating plate and the negative electrode cover plate and is at least partially accommodated in the cap inner cavity of the second cap, and the negative electrode tab connecting part is spaced from the top plate of the second cap.

[0039] Optionally, the cover plate is rectangular;

[0040] Along the length direction of the cover plate, the positive electrode terminal, the first cap, the negative electrode terminal, and the second cap are arranged in sequence; or, the cover plate is rectangular, and along the length direction of the cover plate, the positive electrode terminal, the first cap, the second cap, and the negative electrode terminal are arranged in sequence.

[0041] Optionally, an explosion-proof valve is further included. The cover plate is provided with explosion-proof valve holes penetrating through opposite sides in the thickness direction of the cover plate, and the explosion-proof valve is arranged on the explosion-proof valve holes. The cover plate is rectangular; the insulating plate is provided with air holes, and the air holes are arranged opposite to the explosion-proof valve holes;

[0042] Along the length direction of the cover plate, the positive electrode terminal, the first cap, the negative electrode terminal, the second cap, and the explosion-proof valve are arranged in sequence; or, along the length direction of the cover plate, the positive electrode terminal, the first cap, the second cap, the negative electrode terminal, and the explosion-proof valve are arranged in sequence.

[0043] Optionally, a liquid injection plugging member is further included. The cover plate is provided with liquid injection holes penetrating through opposite sides in the thickness direction of the cover plate, and the liquid injection plugging member is arranged on the liquid injection holes and closes the liquid injection holes. The cover plate is rectangular; the insulating plate is provided with liquid injection through holes, and the liquid injection through holes are arranged opposite to the liquid injection holes;

[0044] Along the length direction of the cover plate, the liquid injection plugging member, the positive electrode terminal, the first cap, the negative electrode terminal, and the second cap are arranged in sequence; or, along the length direction of the cover plate, the liquid injection plugging member, the positive electrode terminal, the first cap, the second cap, and the negative electrode terminal are arranged in sequence.

[0045] Optionally, an explosion-proof valve and a liquid injection plugging member are further included. The cover plate is provided with explosion-proof valve holes and liquid injection holes, and the explosion-proof valve holes and the liquid injection holes penetrate through opposite sides in the thickness direction of the cover plate. The explosion-proof valve is arranged on the explosion-proof valve holes, and the liquid injection plugging member is arranged on the liquid injection holes and closes the liquid injection holes. The cover plate is rectangular; the insulating plate is provided with air holes, and the air holes are arranged opposite to the explosion-proof valve holes; the insulating plate is provided with liquid injection through holes, and the liquid injection through holes are arranged opposite to the liquid injection holes;

[0046] Along the length direction of the cover plate, the liquid injection plugging member, the positive electrode post, the first cap, the negative electrode post, the second cap and the explosion-proof valve are arranged in sequence; or, along the length direction of the cover plate, the liquid injection plugging member, the positive electrode post, the first cap, the second cap, the negative electrode post and the explosion-proof valve are arranged in sequence.

[0047] On the other hand, an embodiment of the present invention provides a battery, including a housing, a battery core, a positive electrode cover plate assembly and a negative electrode cover plate assembly. At least one of the positive electrode cover plate assembly and the negative electrode cover plate assembly is the above-mentioned cover plate assembly. The housing is a cylindrical shape with openings at both ends. The cover plate of the positive electrode cover plate assembly is fixed on one opening end of the housing, and the cover plate of the negative electrode cover plate assembly is fixed on the other opening end of the housing, so as to form a sealed space inside the housing, the positive electrode cover plate assembly and the negative electrode cover plate assembly, and the battery core is arranged in the sealed space.

[0048] On yet another aspect, an embodiment of the present invention provides a battery, including a housing, a battery core and the above-mentioned cover plate assembly. The housing is in the shape of a barrel with one end open. The cover plate of the cover plate assembly is fixed at the opening of the housing, so as to form a sealed space inside the two, and the battery core is arranged in the sealed space.

[0049] On yet another aspect, an embodiment of the present invention provides an electrical device, including the above-mentioned battery.

[0050] The electrical device can be, for example, a vehicle, an energy storage power station, an aircraft, a ship, etc. Description of the Drawings

[0051] Figure 1 is a schematic diagram of the cover plate assembly provided by the first embodiment of the present invention;

[0052] Figure 2 is an exploded view of the cover plate assembly provided by the first embodiment of the present invention;

[0053] Figure 3 is a schematic diagram of the cap of the cover plate assembly provided by the first embodiment of the present invention;

[0054] Figure 4 is a cross-sectional view of the cover plate assembly provided by the first embodiment of the present invention taken along a plane parallel to the cover plate;

[0055] Figure 5 is a schematic diagram of the cover plate assembly provided by the second embodiment of the present invention;

[0056] Figure 6 is an exploded view of the cover plate assembly provided by the second embodiment of the present invention;

[0057] Figure 7It is a cross-sectional view of the cover plate assembly provided by the second embodiment of the present utility model, taken along a plane parallel to the cover plate;

[0058] Figure 8 It is an assembly schematic diagram of the cover plate assembly, the outer shell, and the tab provided by the second embodiment of the present utility model;

[0059] Figure 9 It is a schematic diagram of the cap of the cover plate assembly provided by the third embodiment of the present utility model;

[0060] Figure 10 It is a schematic diagram of the cover plate assembly provided by the fourth embodiment of the present utility model;

[0061] Figure 11 It is a schematic diagram of the battery provided by the fifth embodiment of the present utility model;

[0062] Figure 12 It is a partial enlarged view at the positive electrode cover plate assembly in the exploded view of the battery provided by the fifth embodiment of the present utility model;

[0063] Figure 13 It is a partial enlarged view at the negative electrode cover plate assembly in the exploded view of the battery provided by the fifth embodiment of the present utility model;

[0064] Figure 14 It is a schematic diagram of the cover plate assembly of the battery provided by the sixth embodiment of the present utility model;

[0065] Figure 15 It is a schematic diagram of the battery provided by the sixth embodiment of the present utility model;

[0066] Figure 16 It is an exploded view of the battery provided by the sixth embodiment of the present utility model;

[0067] Figure 17 It is a cross-sectional view of the battery provided by the sixth embodiment of the present utility model;

[0068] Figure 18 It is a schematic diagram of the cover plate assembly provided by the seventh embodiment of the present utility model;

[0069] Figure 19 It is a schematic diagram of the battery provided by the eighth embodiment of the present utility model;

[0070] Figure 20 It is a schematic diagram of the battery provided by the ninth embodiment of the present utility model.

[0071] The reference numerals in the specification are as follows:

[0072] 10. Cover assembly; 101. Positive cover assembly; 102. Negative cover assembly; 20. Outer shell; 30. Electrode core; 301. Tab; 3011. Positive tab; 3012. Negative tab;

[0073] 1. Cover; 11. Cover through-hole; 111. First section of the cover through-hole; 112. Second section of the cover through-hole; 1101. Positive cover through-hole; 1102. Negative cover through-hole; 12. Connection surface; 13. Terminal hole; 131. Positive terminal hole; 132. Negative terminal hole; 14. First surface; 15. Liquid injection hole; 16. Explosion-proof valve hole;

[0074] 2. Cap; 201. First cap; 202. First cap; 21. Cap body; 211. Top plate; 212. Side wall; 2121. First side plate; 2122. Second side plate; 22. Rim; 23. First edge; 24. Second edge; 25. Cap inner cavity;

[0075] 3. Terminal; 31. Positive terminal; 32. Negative terminal;

[0076] 4. Lead-out piece; 41. Terminal connection part; 411. Terminal connection hole; 42. Tab connection part; 401. Positive lead-out piece; 4011. Positive terminal connection part; 4012. Positive tab connection part; 402. Negative lead-out piece; 4021. Negative terminal connection part; 4022. Negative tab connection part;

[0077] 5. Insulating plate; 51. Insulating plate through-hole; 511. Positive insulating plate through-hole; 512. Negative insulating plate through-hole; 52. Terminal through-hole; 521. Positive terminal through-hole; 522. Negative terminal through-hole; 53. Liquid injection through-hole; 54. Air hole;

[0078] 6. Liquid injection plugging piece; 61. Plugging head; 62. Plugging cover;

[0079] 7. Explosion-proof valve; 71. Explosion-proof sheet; 72. Protection sheet. Detailed implementation manners

[0080] In order to make the technical problems, technical solutions and beneficial effects solved by the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0081] First embodiment

[0082] See Figures 1 to 4, the cover assembly 10 provided by an embodiment of the present utility model includes a cover plate 1 and a cap 2 independently arranged from the cover plate. The cap 2 is in the shape of a cap with an open bottom. A cover plate through hole 11 penetrating through opposite sides in the thickness direction of the cover plate 1 is provided on the cover plate 1. 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 a cap inner cavity communicating with the cover plate through hole 11 is provided inside the cap 2.

[0083] In the cover assembly 10 according to the embodiment of the present utility model, the cap 2 is independently arranged from the cover plate 1, and a cap inner cavity communicating with the cover plate through hole 11 is provided inside the cap 2. In this way, the tab can pass through the cover plate through hole 11 and then be welded to the lead-out piece. After the tab is welded to the lead-out piece, the cover plate through hole 11 is closed by the cap 2, optimizing the battery assembly process flow. The tab can pass through the cover plate through hole 11 and then be welded to the lead-out piece, which can prevent damage to the electrode core caused by heat radiation, spatter, etc. during the welding process.

[0084] In addition, the cap inner cavity can accommodate at least part of the welding position of the lead-out piece and the tab, reducing the occupation of the space in the outer shell for arranging the electrode core by the lead-out piece and the tab.

[0085] In addition, after the cap provides an accommodation space for the tab of the battery, the filling amount of the electrode core in the outer shell of the battery increases, and the total active coating area increases, so as to improve the utilization rate of the outer shell space of the battery. Based on this, for batteries of the same size, more active coatings can be carried, and the energy density of the battery is greatly improved.

[0086] In addition, compared with the prior art, the cap inner cavity can expand the internal space of the battery outer shell. The cap inner cavity provides an air flow passage and a storage space for the battery, so that the gas generated in the battery outer shell can gather in the cap inner cavity, thereby slowing down the expansion of the battery.

[0087] A connecting surface 12 is provided on one side of the cover plate 1 close to the cap 2 and is arranged in a circle around the cover plate through hole 11. The bottom surface of the cap 2 is fixedly attached to the connecting surface 12.

[0088] Preferably, the bottom surface of the cap 2 is welded to the connecting surface 12. The welding herein can be laser welding or ultrasonic welding. The material of the cap 2 can be a metal material such as aluminum or copper.

[0089] See Figure 2 , the cover plate through hole 11 includes a first section 111 of the cover plate through hole and a second section 112 of the cover plate through hole. The second section 112 of the cover plate through hole is connected to the side of the first section 111 of the cover plate through hole away from the cap 2.

[0090] The hole wall of the second section 112 of the cover plate through-hole is entirely located inside the first section 111 of the cover plate through-hole, so that the connection surface 12 is formed at the junction of the first section 111 and the second section 112 of the cover plate through-hole. The connection surface 12 is a rectangular closed-loop structure.

[0091] The depth of the first section 111 of the cover plate through-hole is less than the depth of the second section 112 of the cover plate through-hole. That is, the thickness of the cover plate 1 corresponding to the connection surface 13 is greater than the depth of the first section 111 of the cover plate through-hole to ensure the welding strength.

[0092] See Figures 1 to 3 , the cap 2 includes a cap body 21 and a brim 22. The cap body 21 includes a top plate 211 and a side wall 212. The side wall 212 is connected between the top plate 211 and the brim 22. The brim 22 is arranged around the bottom of the side wall 212 in a circle. The bottom surface of the brim 22 is the bottom surface of the cap 2. The brim 22 protrudes from the outer peripheral surface of the side wall 212 in a direction away from the cap inner cavity; the bottom surface of the brim 22 is fixedly attached to the connection surface 12.

[0093] In this embodiment, the cap body 21 is generally square-columnar. The side wall 212 includes a first side plate 2121, a second side plate 2122, a third side plate, and a fourth side plate that are sequentially connected. 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. Rounded corners are provided at the joints of the first side plate 2121, the second side plate 2122, the third side plate, and the fourth side plate with the top plate 211.

[0094] The cover plate 1 is rectangular, and the cover plate through-hole 11 is a square hole.

[0095] The cross-section (horizontal cross-section) of the cap 2 parallel to the cover plate 1 is rectangular. The length of the cap 2 is L, the width of the cap 2 is H, 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 - 2000 mm, and L / H = 2 - 100. The length of the cap 2 is 2 - 100 times the width, which can make full use of 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 - 500 mm, such as 200 mm.

[0096] It further includes a pole column 3. Pole column holes 13 penetrating through opposite sides in the thickness direction of the cover plate 1 are provided on the cover plate 1; the pole column 3 is inserted into the pole column holes 13.

[0097] The cover plate 1 has a first surface 14 and a second surface opposite to each other in its thickness direction, and the first surface 14 is closer to the top surface of the terminal post 3 than the second surface; the height of the cap 2 is h1, and the distance between the top surface of the terminal post 3 and the first surface 14 is h2; then, 3 mm < h1 < 30 mm, and 0 < h1 / h2 < 5. With such a setting, component interference during welding can be reduced and space can be provided for the battery module. Preferably, 0.5 < h1 / h2 ≤ 1.5.

[0098] It further includes a lead-out piece 4 and an insulating plate 5. The insulating plate 5 is attached to a surface of the cover plate 1 away from the cap 2. The insulating plate 5 is provided with an insulating plate through-hole 51 and a terminal post through-hole 52. The terminal post through-hole 52 is arranged opposite to the terminal post hole 13, and the insulating plate through-hole 51 is arranged opposite to the cover plate through-hole 11. The lead-out piece 4 is strip-shaped and includes a terminal post connection part 41 and an ear connection part 42 arranged along its length direction. The terminal post connection part 41 is attached to a surface of the insulating plate 5 away from the cover plate 1 and is connected to one end of the terminal post 3 away from the cap 2. The ear connection part 42 is adapted to be connected to the ear of the electrode core of the battery, and the connection position between the ear connection part 42 and the ear is wrapped with insulating glue to achieve insulation between the connection position between the ear connection part 42 and the ear and the edge of the cover plate through-hole 11 and the inner side surface of the cap 2.

[0099] The ear connection part 42 passes through the insulating plate through-hole 51 and the cover plate through-hole 11 and is at least partially accommodated in the cap inner cavity, and the ear connection part 42 is spaced from the top plate 211 of the cap 2.

[0100] Of course, the ear connection part 42 can also be completely accommodated in the cap inner cavity.

[0101] One end of the terminal post connection part 41 away from the ear connection part 42 is provided with a terminal post connection hole 411, and one end of the terminal post 3 away from the cap 2 is welded in the terminal post connection hole 411.

[0102] It further includes a liquid injection plugging member 6. The cover plate 1 is provided with a liquid injection hole 15 penetrating through opposite sides in its thickness direction. The liquid injection plugging member 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, and the liquid injection through-hole 53 is arranged opposite to the liquid injection hole 15.

[0103] See Figure 1 , along the length direction of the cover plate 1, the cap 2 is located between the liquid injection plugging member 6 and the terminal post 3. The liquid injection plugging member 6 is located at one end of the cover plate 1 in the length direction, the terminal post 3 is located at the other end of the cover plate 1 in the length direction, and the cap 2 is arranged at the middle position and can have a larger length.

[0104] See Figure 2 , the liquid injection plugging member 6 includes a plugging head 61 and a plugging cover 62. The plugging head 61 is press-fitted into the liquid injection hole 15, and the plugging cover 62 is welded and fixed on the cover plate 1 to cover the plugging head 61 and the liquid injection hole 15.

[0105] The cover plate 1 has a first edge 23 and a second edge 24 opposite to each other along its length direction. The pole column 3 is located between the cap 2 and the first edge 23 in the length direction of the cover plate 1. Along the length direction of the cover plate 1, the minimum distance between the cap 2 and the pole column 3 is A, and the minimum distance between the pole column 3 and the first edge 23 is B. Then, 8mm ≤ A ≤ 300mm, and 0.2 ≤ A / B ≤ 50.

[0106] Since the cap 2 and the cover plate 1 are laser welded, when the cap 2 is laser welded, high-temperature heat spread occurs. When A < 8mm, the welding area will affect the pole column 3 (the pole column 3 is usually a ceramic pole column / injection-molded pole column). The pole column 3 is prone to deformation at high temperatures, which is likely to cause risks such as battery leakage. Designing 8mm ≤ A ≤ 300mm can avoid risks such as battery leakage caused by the deformation of the pole column 3 at high temperatures.

[0107] The cover plate 2 is provided with a cover plate through hole 11 with a relatively large area. The cover plate through hole 11 affects the structural strength of the cover plate 2 and constitutes a weak area of the cover plate.

[0108] When A / B < 0.2, the distance between the pole column 3 and the cap 2 is too close, and the strength of the cover plate 1 in this area is too low. It is easy to form defects and cause leakage and corrosion in case of bumping or swelling.

[0109] When 50 < A / B, the distance between the pole column 3 and the cap 2 is relatively far, which increases the electron path, increases the battery internal resistance, improves the heat generation, and the structure is lengthy, resulting in an increase in mass energy density and cost.

[0110] Therefore, designing 0.2 ≤ A / B ≤ 50 can, on the one hand, avoid the formation of defects and leakage corrosion in case of bumping or swelling. On the other hand, it can avoid the distance between the pole column 3 and the cap 2 being too far, avoid a significant increase in the electron path, avoid the increase in heat generation caused by the increase in battery internal resistance, and avoid the increase in mass energy density and cost caused by the lengthy structure.

[0111] The cover plate assembly 10 of this embodiment also has the following advantages:

[0112] (1) After the cap 2 provides accommodation space for the battery's pole lug, the amount of the pole core filled in the battery shell increases, and the total area of ​​the active coating increases, so as to improve the utilization rate of the battery shell space. In addition, since the height of the cap 2 is close to the height of the pole 3, the size of the battery will not change significantly due to the addition of the cap 2. Based on this, batteries of the same size can carry more active coatings, and the energy density of the battery is greatly improved.

[0113] (2) The tab can enter the inner cavity of the cap 2 through the cover plate through hole 11, and be gathered into a bundle in the cap 2, and welded with the tab connection part of the lead sheet 4 in the inner cavity of the cap. The inner cavity of the cap allows the tab to have a longer stretching distance, reduces the bending of the tab in the shell due to the gathering, reduces the damage to the tab, and prevents the short circuit caused by the tab contacting the pole core surface when the pole 3 and the tab are on the same side.

[0114] (3) During the preparation of the battery, due to the crowding inside the shell, 2-3 injection processes are often used to increase the permeability of the electrolyte. However, the space provided by the inner cavity of the cap 2 reduces the injection pressure and increases the amount of electrolyte injection. The inner cavity of the cap can store a small amount of electrolyte and can also prevent lithium precipitation caused by insufficient electrolyte infiltration.

[0115] The cap plate assembly 10 of the first embodiment can be used for a positive electrode cap plate assembly and / or a negative electrode cap plate assembly. Preferably, the cap plate assembly 10 of the first embodiment is used for a positive electrode cap plate assembly.

[0116] Second embodiment

[0117] See also Figures 5 - 8 The cover plate assembly 10 provided in the second embodiment of the utility model is different from the first embodiment in that the injection hole and the injection plugging member are cancelled and an explosion-proof valve 7 is added.

[0118] Specifically, the cover plate 1 is provided with explosion-proof valve holes 16 penetrating through opposite sides of the cover plate 1 in the thickness direction, and the explosion-proof valve 7 is arranged on the explosion-proof valve hole 16; the insulating plate 5 is provided with air holes 54, and the air holes 54 are arranged opposite to the explosion-proof valve hole 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.

[0119] See also Figure 6 The explosion-proof valve 7 comprises 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 weakening notches.

[0120] Since the cap 2 and the cover plate 1 are laser welded, when laser welding the cap 2, high-temperature heat spread occurs. When A < 8 mm, the welding area will affect the terminal 3 (the terminal 3 is usually a ceramic terminal / injection terminal). The terminal 3 is prone to deformation at high temperatures, which may easily cause risks such as battery leakage. It is designed that 8 mm ≤ A ≤ 300 mm to avoid risks such as battery leakage caused by the deformation of the terminal 3 at high temperatures.

[0121] The cover plate 2 is provided with a cover plate through hole 11 with a relatively large area. The cover plate through hole 11 affects the structural strength of the cover plate 2 and constitutes a weak area of the cover plate.

[0122] When A / B < 0.2, the distance between the terminal 3 and the cap 2 is too close, and the strength of the cover plate 1 in this area is too low. It is easy to form defects and cause leakage and corrosion in case of bumping or swelling. Or, when gas is generated inside the battery, the initiation pressure of the weak area of the cover plate is lower than that of the weak area of the explosion-proof valve (the area where the explosion-proof sheet 71 is located), resulting in the explosion of other areas except the explosion-proof valve 7. The discharged high-temperature gas and electrolyte affect the overall operation of the battery module. Therefore, effectively control A / B and reasonably distribute the stress of the cover plate 1 to ensure that the weak areas except the explosion-proof valve 7 will not explode when the internal pressure of the battery reaches the preset value, so as to achieve the reliable explosion-proof function of the explosion-proof valve 7, thereby improving the safety performance of the battery, and ensuring that the explosion-proof valve weak area will not accidentally explode when the internal pressure of the battery is lower than the preset value.

[0123] When 50 < A / B, the distance between the terminal 3 and the cap 2 is relatively far, which increases the electron path, increases the battery internal resistance, increases the heat generation, and the long structure causes an increase in mass energy density and cost.

[0124] Therefore, it is designed that 0.2 ≤ A / B ≤ 50. On the one hand, it can avoid the formation of defects and cause leakage and corrosion in case of bumping or swelling, and can also avoid the accidental explosion of the explosion-proof valve 7. On the other hand, it can avoid the distance between the terminal 3 and the cap 2 being too far, avoid a significant increase in the electron path, avoid the increase in heat generation caused by the increase in battery internal resistance, and avoid the increase in mass energy density and cost caused by the long structure.

[0125] See Figure 8 , the cover plate 1 is welded to one end opening of the battery housing 20. The tab connection part 42 is connected to the tab 301 of the battery core 30. The connection position of the tab connection part 42 and the tab 301 is wrapped with insulating glue to achieve insulation between the connection position of the tab connection part 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 connection part 42 passes through the insulating plate through hole 51 and the cover plate through hole 11 and is at least partially accommodated in the cap inner cavity 25. The tab connection part 42 is spaced from the top plate 211 of the cap 2.

[0126] The cover plate assembly 10 of the second embodiment can be used for the positive cover plate assembly and / or the negative cover plate assembly. Preferably, the cover plate assembly 10 of the first embodiment is used for the negative cover plate assembly.

[0127] Third Embodiment

[0128] See Figure 9 , for the cover plate assembly provided by the three embodiments of the present invention, the difference from the first embodiment is 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 circular, the side surrounding plate 212 is cylindrical, and the cap brim 22 is circular. The cover plate 1 is rectangular. The major axis of the cap body 21 extends along the length direction of the cover plate 1, the minor 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 minor axis of the cap body 21.

[0129] However, in other embodiments, the cap body 21 can also be a hollow column structure with regular shapes such as a hollow square column or a hollow cylindrical column, or it can also be a hollow column structure with other irregular shapes.

[0130] Fourth Embodiment

[0131] See Figure 10 , for the cover plate assembly 10 provided by the four embodiments of the present invention, the difference from the first embodiment is that a plurality of caps 2 (2 in the figure) are provided, and a plurality of cover plate through holes 11 are provided. The bottom of each cap 2 is fixed on the cover plate 1 and closes one side of the corresponding cover plate through hole 11 close to the cap 2.

[0132] The pole column 3 is located between two caps 2.

[0133] The total volume of the cap cavities of the plurality of caps 2 is relatively large, providing a relatively large air flow and storage space for the battery, enabling the gas generated inside the battery housing to gather in the cap cavities, thereby slowing down the expansion of the battery.

[0134] Fifth Embodiment

[0135] See Figures 11 - 13, an embodiment of the present utility model provides a battery, including a housing 20, a core 30, a positive cover plate assembly 101 and a negative cover plate assembly 102. The positive cover plate assembly 101 is the cover plate assembly 10 described in the first embodiment, and the negative cover plate assembly 102 is the cover plate assembly 10 described in the second embodiment. The housing 20 is a cylindrical shape with openings at both ends. The cover plate 1 of the positive cover plate assembly 101 is fixed on one opening end of the housing 20, and the cover plate 1 of the negative cover plate assembly 102 is fixed on the other opening end of the housing 20 to form a sealed space inside the housing 20, the positive cover plate assembly 101 and the negative cover plate assembly 102, and the core 30 is arranged in the sealed space.

[0136] One end of the core 30 leads out a positive pole ear 3011, and the other end leads out a negative pole ear 3012. The positive pole ear 3011 is welded to the pole ear connection part 42 of the lead-out piece 4 of the positive cover plate assembly 101, and the negative pole ear 3012 is welded to the pole ear connection part 42 of the lead-out piece 4 of the negative cover plate assembly 102.

[0137] Sixth Embodiment

[0138] See Figures 14 - 17 , an embodiment of the present utility model provides a battery, and the difference from the fifth embodiment is that there are two pole columns 3, namely a positive pole column 31 and a negative pole column 32, that is, the positive pole column 31 and the negative pole column 32 are led out simultaneously on one side of the cover plate assembly 10. There are two pole column holes 13, namely a positive pole column hole 131 and a negative pole column hole 132. The positive pole column 31 is inserted into the positive pole column hole 131, and the negative pole column 32 is inserted into the negative pole column hole 132.

[0139] It further includes an insulating plate 5 and a lead-out piece 4. The insulating plate 5 is attached to the surface of the cover plate 1 away from the cap 2. There are two insulating plate through holes 51 and two pole column through holes 52 on the insulating plate 5. The two pole column through holes 52 are respectively a positive pole column through hole 521 and a negative pole column through hole 522, and the two insulating plate through holes 51 are respectively a positive insulating plate through hole 511 and a negative insulating plate through hole 512. The positive pole column through hole 521 is arranged opposite to the positive pole column hole 131, and the negative pole column through hole 522 is arranged opposite to the negative pole column hole 132. The positive pole column 31 is inserted into the positive pole column hole 131 and the positive pole column through hole 521, and the negative pole column 32 is inserted into the negative pole column hole 132 and the negative pole column through hole 522; there are two caps 2, namely a first cap 201 and a second cap 202, and there are two cover plate through holes 11, namely a positive cover plate through hole 1101 and a negative cover plate through hole 1102.

[0140] There are two lead-out pieces 4, namely a positive lead-out piece 401 and a negative lead-out piece 402. The positive lead-out piece 401 and the negative lead-out piece 402 are strip-shaped. The positive lead-out piece 401 includes a positive pole column connecting portion 4011 and a positive pole tab connecting portion 4012 arranged along its length direction. The positive pole column connecting portion 4011 is attached to the surface of the insulating plate 5 away from the cover plate 1 and is connected to one end of the positive pole column 31 away from the first cap 201. The positive pole tab connecting portion 4011 is adapted to be connected to the positive pole tab 3011 of the battery core 30, and the connection position between the positive pole tab connecting portion 4011 and the positive pole tab 3011 is wrapped with insulating glue. The negative lead-out piece 402 includes a negative pole column connecting portion 4021 and a negative pole tab connecting portion 4022 arranged along its length direction. The negative pole column connecting portion 4021 is attached to the surface of the insulating plate 5 away from the cover plate 1 and is connected to one end of the negative pole column 32 away from the second cap 202. The negative pole tab connecting portion 4021 is adapted to be connected to the negative pole tab 3012 of the battery core 30, and the connection position between the negative pole tab connecting portion 4022 and the negative pole tab 3012 is wrapped with insulating glue.

[0141] The positive pole tab connecting portion 4012 passes through the positive insulating plate through-hole 511 and the positive cover plate through-hole 1101 and is at least partially received in the cap inner cavity 25 of the first cap 201. The positive pole tab connecting portion 4012 is spaced from the top plate of the first cap 201. The negative pole tab connecting portion 4022 passes through the negative insulating plate through-hole 512 and the negative cover plate through-hole 1102 and is at least partially received in the cap inner cavity 25 of the second cap 202. The negative pole tab connecting portion 4022 is spaced from the top plate of the second cap 202.

[0142] The cover plate 1 is rectangular. Along the length direction of the cover plate 1, the positive pole column 31, the first cap 201, the negative pole column 32, and the second cap 202 are arranged in sequence.

[0143] It further includes an explosion-proof valve 7. The cover plate 1 is provided with an explosion-proof valve hole 16 penetrating through opposite sides in the thickness direction of the cover plate 1. The explosion-proof valve 7 is arranged on the explosion-proof valve hole 16. The insulating plate 5 is provided with an air hole 54, and the air hole 54 is arranged opposite to the explosion-proof valve hole 16. Along the length direction of the cover plate 1, the positive pole column 31, the first cap 201, the negative pole column 32, the second cap 202, and the explosion-proof valve 7 are arranged in sequence.

[0144] It further includes a liquid injection plugging member 6. Liquid injection holes 15 penetrating through opposite sides in the thickness direction of the cover plate 1 are provided on the cover plate 1. The liquid injection plugging member 6 is disposed on the liquid injection holes 15 to seal the liquid injection holes 15; a liquid injection through hole 53 is provided on the insulating plate 5, and the liquid injection through hole 53 is disposed opposite to the liquid injection holes 15. Refer to Figure 14 Along the length direction of the cover plate 1, the liquid injection plugging member 6, the positive pole column 31, the first cap 201, the negative pole column 32, the second cap 202, and the explosion-proof valve 7 are sequentially arranged.

[0145] The seventh embodiment

[0146] Refer to Figure 18 The seventh embodiment of the present utility model provides a cover plate assembly 10, which is different from the cover plate assembly 10 in the sixth embodiment in that along the length direction of the cover plate 1, the liquid injection holes 15, the positive pole column 31, the first cap 201, the second cap 202, the negative pole column 32, and the explosion-proof valve 7 are sequentially arranged.

[0147] The eighth embodiment

[0148] Refer to Figure 19 The eighth embodiment of the present utility model provides a battery, which is mainly different from the fifth embodiment shown in Figure 11 that the negative cover plate assembly 102 adopts a conventional cover plate assembly, and the conventional cover plate assembly here refers to a cover plate assembly without a cap.

[0149] Compared with the fifth embodiment, the manufacturing cost can be reduced.

[0150] The ninth embodiment

[0151] Refer to Figure 20 The ninth embodiment of the present utility model provides a battery, which is mainly different from the fifth embodiment shown in Figure 11 that the positive cover plate assembly 101 adopts a conventional cover plate assembly, and the conventional cover plate assembly here refers to a cover plate assembly without a cap.

[0152] Compared with the fifth embodiment, the manufacturing cost can be reduced.

[0153] In addition, the embodiments of the present utility model provide an electrical device including the battery in the above embodiments. Multiple batteries can form a battery module or a battery pack. The battery module or the battery pack can form a battery pack.

[0154] The electrical device can be, for example, a vehicle, an energy storage power station, an aircraft, a ship, etc.

[0155] The above are only the preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A cover plate assembly, characterized in that: It includes a cover plate and a cap provided independently of the cover plate. There is a cover plate through hole penetrating through opposite sides in the thickness direction of the cover plate on 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. The inside of the cap has a cap inner cavity communicating with the cover plate through hole.

2. The cover plate assembly according to claim 1, characterized in that: The cap is in the shape of a cap with an open bottom.

3. The cover plate assembly according to claim 1, characterized in that: On the side of the cover plate close to the cap, there is a connection surface arranged in a circle around the cover plate through hole. The bottom surface of the cap is fixedly attached to the connection surface.

4. The cover plate assembly according to claim 3, characterized in that: The bottom surface of the cap is welded to the connection surface.

5. The cover plate assembly according to claim 3, characterized in that: The cover plate through hole includes a first section of the cover plate through hole and a second section of the cover plate through hole. The second section of the cover plate through hole is connected to the side of the first section of the cover plate through hole away from the cap. The hole wall of the second section of the cover plate through hole is entirely located inside the first section of the cover plate through hole, so that the connection surface is formed at the junction of the first section of the cover plate through hole and the second section of the cover plate through hole.

6. The cover plate assembly according to claim 5, characterized in that: The depth of the first section of the cover plate through hole is less than the depth of the second section of the cover plate through hole.

7. The cover plate assembly according to claim 3, characterized in that: The cap includes a cap body and a brim. The cap body includes a top plate and a side surrounding plate. The side surrounding plate is connected between the top plate and the brim. The brim is arranged in a circle around the bottom of the side surrounding plate. The bottom surface of the brim is the bottom surface of the cap. The brim protrudes from the outer peripheral surface of the side surrounding plate in a direction away from the cap inner cavity. The bottom surface of the brim is fixedly attached to the connection surface.

8. The cover plate assembly according to claim 7, characterized in that: The cap body is in the shape of a hollow square column, a hollow circular column or a hollow elliptical column.

9. The cover plate assembly according to claim 1, characterized in that: The cover plate through hole is a square hole, a circular hole or an elliptical hole.

10. The cover plate assembly according to claim 1, characterized in that: The cross-section of the cap parallel to the cover plate is rectangular. 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.

11. The cover plate assembly according to claim 1, characterized in that: It further includes a terminal post. There is a terminal post hole penetrating through opposite sides in the thickness direction of the cover plate on the cover plate. The terminal post is inserted through the terminal post hole.

12. The cover plate assembly according to claim 11, characterized in that: The cover plate has a first surface and a second surface opposite to each other in its thickness direction. The first surface is closer to the top surface of the terminal post than the second surface. The height of the cap is h1, and the distance between the top surface of the terminal post and the first surface is h2. Then, 3 mm < h1 < 30 mm, and 0 < h1 / h2 < 5.

13. The cover plate assembly according to claim 11, characterized in that: The cover plate is rectangular. The cover plate has a first edge and a second edge opposite to each other along its length direction. The terminal post is located between the cap and the first edge in the length direction of the cover plate. The minimum distance between the outer edge of the cap and the outer edge of the terminal post is A, and the minimum distance between the terminal post and the first edge is B. Then, 8 mm ≤ A ≤ 300 mm, and 0.2 ≤ A / B ≤ 50.

14. The cover plate assembly according to claim 11, characterized in that: It also includes a lead-out sheet and an insulating plate, wherein the insulating plate is attached to a 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 arranged opposite to the pole hole, the insulating plate through hole is arranged opposite to the cover plate through hole, the lead-out sheet is in the shape of an elongated strip, and the lead-out sheet includes a pole connecting portion and a pole ear connecting portion arranged along its length direction, the pole connecting portion is attached to a side surface of the insulating plate away from the cover plate and connected to an end of the pole away from the cap, the pole ear connecting portion is suitable for connecting to a pole ear of a pole core of a battery, and the connection position between the pole ear connecting portion and the pole ear is wrapped with insulating glue; The tab connection portion is inserted through the insulating plate through hole and the cover plate through hole and is at least partially accommodated in the inner cavity of the cap. The tab connection portion is spaced apart from the top plate of the cap.

15. The cover plate assembly according to claim 14, characterized in that: A pole connection hole is provided at one end of the pole connection portion away from the pole lug connection portion, and one end of the pole away from the cap is welded in the pole connection hole.

16. The cover plate assembly according to claim 14, characterized in that: It also includes an explosion-proof valve, wherein the cover plate is provided with explosion-proof valve holes penetrating through opposite sides of the cover plate in the thickness direction, and the explosion-proof valve is arranged on the explosion-proof valve hole; The insulating plate is provided with air holes, and the air holes are arranged opposite to the explosion-proof valve hole.

17. The cover plate assembly according to claim 16, characterized in that: The cover plate is rectangular, and along the length direction of the cover plate, the cover cap is located between the explosion-proof valve and the pole.

18. The cover plate assembly according to claim 14, characterized in that: It also includes a liquid injection plugging member, wherein the cover plate is provided with liquid injection holes on two opposite sides of the cover plate in the thickness direction, and the liquid injection plugging member is provided on the liquid injection hole and closes the liquid injection hole; The insulating plate is provided with a liquid injection through hole, and the liquid injection through hole is arranged directly opposite to the liquid injection hole; The cover plate is rectangular, and along the length direction of the cover plate, the cap is located between the liquid injection plugging member and the pole.

19. The cover plate assembly according to claim 1, characterized in that: There are a plurality of cover caps, and a plurality of cover plate through holes. The bottom of each cover cap is fixed on the cover plate and closes a side of the corresponding cover plate through hole close to the cover cap.

20. The cover plate assembly according to claim 11, characterized in that There are two poles, namely a positive pole and a negative pole. There are two pole holes, namely a positive pole hole and a negative pole hole. The positive pole is inserted into the positive pole hole, and the negative pole is inserted into the negative pole hole.

21. The cover plate assembly according to claim 20, characterized in that: It also includes an insulating plate and a lead-out sheet, wherein the insulating plate is attached to a side surface of the cover plate away from the cap, and the insulating plate is provided with two insulating plate through holes and two pole through holes, the two pole through holes are respectively a positive pole through hole and a negative pole through hole, the two insulating plate through holes are respectively a positive insulating plate through hole and a negative insulating plate through hole, the positive pole through hole is arranged opposite to the positive pole hole, the negative pole through hole is arranged opposite to the negative pole hole, the positive pole is penetrated in the positive pole hole and the positive pole through hole, and the negative pole is penetrated in the negative pole hole and the negative pole through hole; the cap is provided with two, namely a first cap and a second cap, and the cover plate through holes are provided with two, namely a positive cover plate through hole and a negative cover plate through hole; The lead-out sheet is provided with two, namely a positive lead-out sheet and a negative lead-out sheet, the positive lead-out sheet and the negative lead-out sheet are in the shape of long strips, the positive lead-out sheet comprises a positive pole column connection part and a positive pole ear connection part arranged along its length direction, the positive pole column connection part is attached to a side surface of the insulating plate away from the cover plate and connected to an end of the positive pole column away from the first cap, the positive pole ear connection part is suitable for connecting to the positive pole ear of the pole core of the battery, and the connection position of the positive pole ear connection part and the positive pole ear is wrapped with insulating glue; the negative lead-out sheet comprises a negative pole column connection part and a negative pole ear connection part arranged along its length direction, the negative pole column connection part is attached to a side surface of the insulating plate away from the cover plate and connected to an end of the negative pole column away from the second cap, the negative pole ear connection part is suitable for connecting to the negative pole ear of the pole core of the battery, and the connection position of the negative pole ear connection part and the negative pole ear is wrapped with insulating glue; The positive pole tab connection portion is passed through the through hole of the positive insulating plate and the through hole of the positive cover plate and is at least partially accommodated in the cap inner cavity of the first cap, and the positive pole tab connection portion is spaced apart from the top plate of the first cap; the negative pole tab connection portion is passed through the through hole of the positive insulating plate and the through hole of the negative cover plate and is at least partially accommodated in the cap inner cavity of the second cap, and the negative pole tab connection portion is spaced apart from the top plate of the second cap.

22. The cover plate assembly according to claim 21, characterized in that: The cover plate is rectangular; The positive pole, the first cap, the negative pole and the second cap are arranged in sequence along the length direction of the cover plate; or, the cover plate is rectangular, and the positive pole, the first cap, the second cap and the negative pole are arranged in sequence along the length direction of the cover plate.

23. The cover plate assembly according to claim 21, characterized in that It also includes an explosion-proof valve, the cover plate is provided with explosion-proof valve holes penetrating through the cover plate on opposite sides in the thickness direction, the explosion-proof valve is arranged on the explosion-proof valve hole, and the cover plate is rectangular; the insulating plate is provided with an air hole, and the air hole is arranged directly opposite to the explosion-proof valve hole; Along the length direction of the cover plate, the positive pole, the first cap, the negative pole, the second cap and the explosion-proof valve are arranged in sequence; or, along the length direction of the cover plate, the positive pole, the first cap, the second cap, the negative pole and the explosion-proof valve are arranged in sequence.

24. The cover plate assembly according to claim 21, characterized in that It also includes a liquid injection plugging member, the cover plate is provided with liquid injection holes penetrating through the cover plate on opposite sides in the thickness direction, the liquid injection plugging member is arranged on the liquid injection hole and closes the liquid injection hole, the cover plate is rectangular; the insulating plate is provided with a liquid injection through hole, and the liquid injection through hole is arranged directly opposite to the liquid injection hole; Along the length direction of the cover plate, the liquid injection plugging piece, the positive electrode column, the first cap, the negative electrode column and the second cap are arranged in sequence; or, along the length direction of the cover plate, the liquid injection plugging piece, the positive electrode column, the first cap, the second cap and the negative electrode column are arranged in sequence.

25. The cover plate assembly according to claim 21, characterized in that It also includes an explosion-proof valve and a liquid injection plugging member, the cover plate is provided with an explosion-proof valve hole and a liquid injection hole, the explosion-proof valve hole and the liquid injection hole penetrate the opposite sides of the cover plate in the thickness direction, the explosion-proof valve is arranged on the explosion-proof valve hole, the liquid injection plugging member is arranged on the liquid injection hole and closes the liquid injection hole, and the cover plate is rectangular; the insulating plate is provided with an air hole, the air hole is arranged opposite to the explosion-proof valve hole; the insulating plate is provided with a liquid injection through hole, the liquid injection through hole is arranged opposite to the liquid injection hole; Along the length direction of the cover plate, the liquid injection plugging piece, the positive pole, the first cap, the negative pole, the second cap and the explosion-proof valve are arranged in sequence; or, along the length direction of the cover plate, the liquid injection plugging piece, the positive pole, the first cap, the second cap, the negative pole and the explosion-proof valve are arranged in sequence.

26. A battery, characterized in that: It includes a shell, 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 according to any one of claims 1 to 20, the shell is a cylinder with openings at both ends, the cover plate of the positive cover plate assembly is fixed to one end opening of the shell, and the cover plate of the negative cover plate assembly is fixed to the other end opening of the shell to form a closed space on the inner side of the shell, the positive cover plate assembly and the negative cover plate assembly, and the pole core is arranged in the closed space.

27. A battery, characterized in that: It comprises an outer shell, a pole core and a cover plate assembly as described in any one of claims 21-25, wherein the outer shell is in the shape of a barrel with one end open, and the cover plate of the cover plate assembly is fixed at the opening of the outer shell to form a closed space on the inner side of the two, and the pole core is arranged in the closed space.

28. An electrical equipment, characterized in that: Comprising the battery of claim 26 or 27.

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