Cover plate, cover plate assembly, battery cell, battery, battery assembly and electric equipment

Abstract

The utility model discloses a cover plate, cover plate subassembly, cell, battery, battery subassembly and electric equipment, the cover plate includes cover plate body, pole and first collector plate, pole is provided on the cover plate body, pole and cover plate body insulation connection; the first collector plate is connected with the pole, the first collector plate comprises a main body part, the main body part is used for being connected with a tab, the main body part is exposed out of the cover plate body along the thickness direction of the first collector plate, the shortest distance between the main body part and the center of the pole is d0, and the d0 is greater than or equal to 2mm and less than or equal to 8mm. According to the cover plate disclosed by the utility model, the integration level of the cover plate is relatively high, and when the cover plate is used for the battery cell, the current-carrying capacity is improved, the impedance is reduced, and the mounting efficiency of the battery cell is also improved.

Description

Technical Field

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

[0002] As the core component of power batteries, battery cells play a significant role in power batteries. For power batteries, battery cells determine the quality of power battery products, and of course, they are also related to the battery life and capacity of electrical equipment.

[0003] In the related art, the battery cell includes a cover plate, which has a large number of components and a low integration, which reduces the performance of the cover plate. When assembling the battery cell, the assembly steps are cumbersome and the operation is complicated, thereby reducing the assembly efficiency of the battery cell. Moreover, the current carrying capacity of the battery cell is low and the impedance is high. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a cover plate with a high degree of integration. When the cover plate is used for a battery cell, the current carrying capacity is improved, the impedance is reduced, and the installation efficiency of the battery cell is improved.

[0005] The second objective of the present invention is to provide a cover plate assembly using the above-mentioned cover plate.

[0006] The third objective of the present utility model is to provide a battery cell using the above-mentioned cover plate assembly.

[0007] The fourth objective of the present utility model is to provide a battery using the above-mentioned battery cell.

[0008] The fifth object of the present utility model is to provide a battery assembly using the above-mentioned battery.

[0009] The sixth objective of the present utility model is to provide an electrical device using the above battery module.

[0010] According to the cover plate of the first aspect of the utility model, the cover plate includes: a cover plate body; a pole, the pole is arranged on the cover plate body, the first current collecting plate includes a main body, the main body is suitable for connecting with the pole ear, and the pole is insulated and connected to the cover plate body; a first current collecting plate, the first current collecting plate is connected to the pole, along the thickness direction of the first current collecting plate, the main body is exposed from the cover plate body, the shortest distance between the main body and the center of the pole is d0, wherein d0 satisfies: 2mm≤d0≤8mm.

[0011] According to the cover of the utility model, by setting the shortest distance d0 between the main body and the center of the pole to meet 2mm≤d0≤8mm, it is beneficial to connect the first collector with the first pole ear and the pole, and it can also reduce impedance and improve current carrying capacity. In addition, the pole is insulated and connected to the cover body, which can prevent the current on the pole from flowing to the cover body and avoid short circuit, thereby facilitating the current passing through the pole. In addition, it is also convenient to install the pole. When the cover is used for the battery cell, it is beneficial to the long-term normal use of the battery cell.

[0012] According to the cover plate of the present invention, the d0 further satisfies: 4mm≤d0≤8mm.

[0013] According to the cover plate of the utility model, the pole is inserted into the cover plate body, a first insulating spacer and a sealing member are provided between the outer peripheral surface of the pole and the cover plate body, the sealing member is sleeved on the pole, and the first insulating spacer is provided on the sealing member and the outer peripheral side of the pole.

[0014] According to the cover plate of the utility model, the cover plate further includes: a connector connected to an end of the pole away from the first current collecting disk along the thickness direction of the first current collecting disk; a second insulating separator, which is arranged between the connector and the cover plate body.

[0015] According to the cover plate of the utility model, a second insulating separator groove is formed on the second insulating separator, the connecting member is fitted in the second insulating separator groove, and the connecting member is insulated from the cover plate body by the second insulating separator.

[0016] According to the cover plate of the utility model, the pole includes a first pole segment and a second pole segment connected to each other, the first pole segment passes through the cover plate body and the second insulating separator and is connected to the connecting member, the second pole segment is located on the side of the cover plate body facing the first current collecting disk, and the second pole segment is connected to the first current collecting disk.

[0017] According to some embodiments of the utility model, a cover plate through-hole is formed on the cover plate body, the first pole segment passes through the cover plate through-hole, at least a portion of the seal is arranged between the outer peripheral surface of the first pole segment and the inner peripheral wall of the cover plate through-hole, and the first insulating partition is arranged on the outer peripheral side of the seal and the second pole segment.

[0018] According to some embodiments of the utility model, the seal includes: a first sealing section, the first sealing section is arranged between the outer peripheral surface of the pole and the inner peripheral wall of the cover plate perforation; a second sealing section, the second sealing section is connected to one end of the first sealing section adjacent to the first current collecting disk, and the second sealing section is located between the first insulating partition and the first pole section.

[0019] According to some embodiments of the utility model, a stop groove is formed on the surface of one side of the first insulating separator adjacent to the first current collecting disk, and the second pole segment fits in the stop groove; an extension portion is provided on the first current collecting disk, at least a portion of the outer periphery of the extension portion fits in the stop groove, and the extension portion is located on a side of the second pole segment away from the cover plate body and is connected.

[0020] According to some embodiments of the present invention, at least a portion of the outer peripheral edge of the extension portion is adapted to the shape of the inner peripheral wall of the anti-rotation groove.

[0021] According to some embodiments of the utility model, a stop protrusion is provided on a side surface of the first insulating separator adjacent to the first current collecting disk, and the stop protrusion and the side surface of the first insulating separator adjacent to the first current collecting disk jointly define the stop groove, and the side of the stop groove adjacent to the center of the first current collecting disk is open.

[0022] According to some embodiments of the present invention, the thickness of the first insulating separator is d1, wherein d1 satisfies: 0.5 mm ≤ d1 ≤ 2.0 mm.

[0023] According to some embodiments of the present invention, the first insulating separator is an injection molded part.

[0024] According to some embodiments of the utility model, a cover protrusion is provided on the side surface of the cover body adjacent to the first insulating separator along the thickness direction of the cover body; a first insulating separator groove is formed on the side surface of the first insulating separator adjacent to the cover body along the thickness direction of the cover body, a first insulating separator through-hole is formed on the bottom wall of the first insulating separator groove, the first pole segment passes through the first insulating separator through-hole, and the cover protrusion fits in the first insulating separator groove.

[0025] According to some embodiments of the present invention, the cover plate protrusion is formed by a portion of a side surface of the cover plate body away from the first current collecting plate along a thickness direction of the cover plate body protruding toward a side surface of the first current collecting plate.

[0026] According to some embodiments of the present invention, the cover protrusion forms a cover groove on a side surface of the cover body away from the first collecting plate along the thickness direction of the cover body, and at least a portion of the second insulating spacer fits in the cover groove.

[0027] According to some embodiments of the present invention, the connecting piece is polygonal or oblong.

[0028] According to some embodiments of the present invention, the width of the connecting member is w, and the diameter of the pole is d2, wherein w and d2 satisfy: 3.5mm≤w-d2≤6mm.

[0029] According to some embodiments of the present invention, the connecting piece is a stamped aluminum piece.

[0030] According to some embodiments of the present invention, the cover plate body is a steel stamping part.

[0031] According to some embodiments of the present invention, the first current collecting plate is provided with a connecting protrusion which protrudes away from the cover plate body along the thickness direction of the first current collecting plate.

[0032] According to some embodiments of the utility model, the connecting protrusion includes a first protrusion portion and a second protrusion portion, one end of the first protrusion portion is connected to one end of the second protrusion portion, the other end of the first protrusion portion and the other end of the second protrusion portion extend in a direction away from each other, and the angle between the first protrusion segment and the second protrusion segment is β, wherein β satisfies: 20°≤β≤80°.

[0033] According to some embodiments of the present invention, the connecting protrusion is formed by a portion of a side surface of the first current collecting disk adjacent to the pole along the thickness direction of the first current collecting disk protruding toward a side surface away from the pole, and the connecting protrusion forms a groove on the side surface of the first current collecting disk adjacent to the pole along the thickness direction of the first current collecting disk to form the connecting protrusion on the side surface away from the pole.

[0034] According to the cover plate assembly of the second aspect embodiment of the utility model, it includes: a cover plate, which is the cover plate according to the first aspect embodiment of the utility model; a second current collecting plate, which is connected to the cover plate body of the cover plate, and the second current collecting plate is insulated from the pole of the cover plate and the first current collecting plate, and the second current collecting plate and the first current collecting plate are respectively connected to the pole ears with opposite polarities.

[0035] According to some embodiments of the present invention, the cover plate assembly further includes: a substrate connected to a side of the cover plate away from the second current collecting plate along the thickness direction of the cover plate, an opening is formed on the substrate, and the pole is exposed from the opening.

[0036] According to some embodiments of the present invention, the outer periphery of the cover plate has a step portion, and the edge of the opening has a matching portion extending toward the center of the opening, and the matching portion is matched on the step portion.

[0037] According to some embodiments of the present invention, on the side where the second current collecting plate is located, the minimum distance between the edge of the opening and the outer periphery of the substrate is d4, wherein d4 satisfies: 1.5 mm≤d4≤4 mm.

[0038] According to some embodiments of the present invention, the cover plate assembly further includes: a first insulating member, wherein the first insulating member is disposed between the base plate and the first current collecting plate.

[0039] According to some embodiments of the present invention, the thickness of the first insulating member is h1, wherein h1 satisfies: 20um≤h1≤200um.

[0040] According to the third aspect of the present invention, the battery cell includes: a pole core, one end of which is provided with a first pole ear and a second pole ear, the polarities of the first pole ear and the second pole ear are opposite; a cover plate assembly, the cover plate assembly is the cover plate assembly according to the second aspect of the present invention, the cover plate assembly is arranged at the one end of the pole core, the first current collecting disk of the cover plate assembly is connected to the first pole ear, and the second current collecting disk of the cover plate assembly is connected to the second pole ear.

[0041] According to some embodiments of the present invention, the battery cell further includes: a second insulating member, wherein the second insulating member is disposed between the first pole tab and the second pole tab.

[0042] According to some embodiments of the present invention, the thickness of the second insulating member is h2, wherein h2 satisfies: 20um≤h2≤200um.

[0043] According to some embodiments of the present invention, the pole of the cover plate assembly is opposite to the center of the one end of the pole core.

[0044] A battery according to an embodiment of the fourth aspect of the utility model includes a battery cell according to an embodiment of the third aspect of the utility model.

[0045] According to some embodiments of the present invention, the side edge of the cover plate body of the cover plate of the cover plate assembly of the battery cell is an arc shape adapted to the outer peripheral contour of the battery cell.

[0046] The battery assembly according to the fifth aspect of the utility model includes the battery according to the fourth aspect of the utility model.

[0047] The electrical equipment according to the sixth aspect of the present invention comprises the battery assembly according to the fifth aspect of the present invention.

[0048] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0050] Figure 1 is a schematic diagram of a cover plate according to an embodiment of the utility model;

[0051] Figure 2 is an exploded view of a cover plate according to an embodiment of the utility model;

[0052] Figure 3 is a schematic diagram of a first insulating partition of a cover plate according to an embodiment of the utility model;

[0053] Figure 4 is a schematic diagram of a first current collecting plate of a cover plate according to an embodiment of the utility model;

[0054] Figure 5 is a top view of a battery cell according to an embodiment of the utility model, wherein the substrate is not shown;

[0055] Figure 6 Schematic diagram of the second current collecting plate of the cover plate assembly according to the embodiment of the utility model

[0056] Figure 7 is a top view of a cover plate assembly according to an embodiment of the utility model;

[0057] Figure 8 is a schematic diagram of a battery cell according to an embodiment of the utility model;

[0058] Fig. 9 is a cross-sectional view of the end of a battery cell according to an embodiment of the utility model;

[0059] Fig.10 yes Fig. 9 The enlarged view of the circled section A;

[0060] Fig.11 is an exploded view of a battery cell according to an embodiment of the utility model;

[0061] Fig.12 is a top view of a battery cell according to an embodiment of the utility model, wherein the cover plate is not shown;

[0062] Fig.13 is a schematic diagram of a battery cell according to an embodiment of the utility model from another angle;

[0063] Fig.14 is an exploded view of a battery cell according to an embodiment of the utility model from another angle;

[0064] Fig.15 It is a schematic diagram of the sealing structure of the battery cell according to an embodiment of the utility model.

[0065] Reference numerals:

[0066] 100, cover plate;

[0067] 1. Cover plate body; 11. Cover plate perforation; 12. Cover plate protrusion;

[0068] 13. Cover plate groove; 14. Step portion;

[0069] 2. Pole; 21. First pole section; 22. Second pole section;

[0070] 3. First current collecting plate; 31. Extension portion; 32. Connecting protrusion;

[0071] 321, first protrusion; 322, second protrusion;

[0072] 33. groove; 34. notch; 35. main body;

[0073] 4. first insulating separator; 41. anti-rotation groove; 42. anti-rotation protrusion;

[0074] 43. first insulating spacer groove; 44. first insulating spacer through hole;

[0075] 5. a second insulating spacer; 51. a second insulating spacer groove;

[0076] 6. Connecting piece; 7. Sealing piece; 71. First sealing section; 72. Second sealing section;

[0077] 200, cover plate assembly;

[0078] 201, second current collecting plate; 2011, first connecting portion; 201a, first sub-connecting portion;

[0079] 201b, first side; 201c, second side;

[0080] 2012, second connection part; 201d, second sub-connection part;

[0081] 2013, third connection part; 201e, third sub-connection part; 201f, fourth sub-connection part;

[0082] 202, substrate; 2021, opening; 2022, matching portion; 203, first insulating member;

[0083] 300, battery cell;

[0084] 301, pole core; 3011, first pole ear; 3012, second pole ear; 3013, center hole;

[0085] 302, second insulating member; 303, outer shell; 3030, shell body;

[0086] 3031, bottom cover plate; 303a, liquid injection hole;

[0087] 3032, sealing structure; 303b, elastic sealing pad; 303c, sealing cover; 304, partition. DETAILED DESCRIPTION

[0088] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Figure 1-Figure 4 The cover plate 100 according to the embodiment of the present invention is described. In the following description of the present application, the cover plate 100 is described by taking the battery cell 300 as an example.

[0089] like Figure 1 and Figure 2 As shown, the cover plate 100 according to the embodiment of the first aspect of the utility model includes a cover plate body 1 , a pole 2 and a first collecting plate 3 .

[0090] Specifically, the pole 2 is arranged on the cover body 1, and the pole 2 is insulated and connected to the cover body 1. Figure 1 and Figure 2 In the example, the pole 2 is plugged into the cover body 1, the lower end face of the pole 2 is located below the cover body 1, and the upper end face of the pole 2 extends out after passing through the cover body 1. This arrangement facilitates the connection between the pole 2 and the cover body 1. In addition, the pole 2 is insulated from the cover body 1, which can prevent the current on the pole 2 from flowing to the cover body 1, thereby facilitating the current on the pole 2 to pass through. When the cover 100 is used for the battery cell 300, it is beneficial for the battery cell 300 to be used normally for a long time.

[0091] Combination Figure 1 , Figure 2 and Figure 3 The first current collecting plate 3 is connected to the pole 2. The first current collecting plate 3 includes a main body 35. The main body 35 is suitable for connecting with a pole ear (for example, a first pole ear 3011). Figure 2In the up and down direction), the main body 35 is exposed from the cover body 1, and the shortest distance between the main body 35 and the center of the pole 2 is d0, where d0 satisfies: 2mm≤d0≤8mm.

[0092] For example, in Figure 1 , Figure 2 and Figure 3 In the example, a part of the first current collecting disc 3 is located below the cover body 1 and connected to the pole 2, and the main body 35 (i.e., another part of the first current collecting disc 3) is exposed from the cover body 1. After the first current collecting disc 3 and the pole 2 are connected by welding, the first current collecting disc 3 is then connected by welding to the first pole lug 3011 of the pole core 301. In order to reduce impedance and ensure current carrying capacity, it is necessary to weld as many turns of pole lugs as possible, that is, the closer the welding track of the first current collecting disc 3 is to the center of the pole core 301, the better. Therefore, when the shortest distance d0 between the main body 35 and the center of the pole 2 is less than 2 mm, that is, the distance between the edge of the side of the cover body 1 facing the first current collecting disc 3 and the central axis of the pole 2 is small, the overlapping area of ​​the first current collecting disc 3 and the cover body 1 in the up and down direction is small, which is not conducive to the connection between the first current collecting disc 3 and the pole 2, and also makes the space for installing the pole 2 small, which is not conducive to the setting of the pole 2. When the shortest distance d0 between the main body 35 and the center of the pole 2 is greater than 8mm, the welding track of the first current collecting disc 3 and the first pole ear 3011 is far from the center of the pole 2, which increases the impedance and reduces the current carrying capacity. Therefore, by setting the shortest distance d0 between the main body 35 and the center of the pole 2 to meet the following conditions: 2mm≤d0≤8mm, the distance between the main body 35 of the first current collecting disc 3 exposed to the cover body 1 and the center of the pole 2 is reasonably set, which is conducive to the connection between the first current collecting disc 3 and the first pole ear 3011 and the pole 2, and can also reduce the impedance and improve the current carrying capacity. In addition, the installation space of the pole 2 is reasonable, which is also convenient for the setting of the pole 2. In the related art, in order to ensure that the welding point between the current collecting disc and the pole ear can be as close to the center of the pole core as possible, the pole and the current collecting disc can only be welded in the middle of the pole core. However, welding from top to bottom will cause insulation failure and battery short circuit due to the presence of an insulating part in the middle. Usually, only the method of welding from bottom to top can be selected, and due to the excessive heat of laser welding, only torque welding can be used. However, torque welding is not conducive to improving the current carrying capacity of the battery cell and has high costs. Therefore, the solution of the present application can avoid the use of torque welding between the pole 2 and the first collector plate 3, thereby improving the current carrying capacity of the battery cell 300 and facilitating the use of the battery cell 300.

[0093] According to the cover plate 100 of the utility model, by setting the shortest distance d0 between the main body 35 and the center of the pole 2 to meet 2mm≤d0≤8mm, it is beneficial to connect the first collector 3 with the first pole ear 3011 and the pole 2, and it can also reduce impedance and improve current carrying capacity. In addition, the pole 2 is insulated from the cover plate body 1, which can prevent the current on the pole 2 from flowing to the cover plate body 1 and avoid short circuit, thereby facilitating the current passing through the pole 2. In addition, it is also convenient to install the pole 2. When the cover plate 100 is used for the battery cell 300, it is beneficial to the long-term normal use of the battery cell 300.

[0094] According to some embodiments of the present invention, referring to Figure 3 , d0 further satisfies: 4mm≤d0≤8mm. For example, when the shortest distance d0 between the main body 35 and the center of the pole 2 is less than 4mm, that is, the distance between the edge of the side of the cover body 1 facing the first current collecting disc 3 and the central axis of the pole 2 is small, the overlapping area of ​​the first current collecting disc 3 and the cover body 1 in the up and down direction is small, which is not conducive to the connection between the first current collecting disc 3 and the pole 2. Therefore, by setting the shortest distance d0 between the main body 35 and the center of the pole 2 to satisfy: 4mm≤d0≤8mm, the distance setting between the main body 35 of the first current collecting disc 3 exposed to the cover body 1 and the center of the pole 2 is more reasonable, which is conducive to the connection between the first current collecting disc 3 and the first pole lug 3011 and the pole 2, and can also reduce impedance and improve current carrying capacity. For example, d0 can be set to 2mm, 4mm or 8mm to facilitate the connection between the first current collecting disc 3 and the pole 2.

[0095] Reference Figure 1 and Figure 2 , the first current collecting plate 3, the pole 2 and the cover plate body 1 are integrated into one. Figure 1 and Figure 2 In the example, after the pole 2 is connected to the cover body 1, the lower end face of the pole 2 is connected to the upper side face of the first current collecting disc 3. With such a configuration, the integration can make the pole 2 and the first current collecting disc 3 pre-connected, such as by welding, and then the integrated first current collecting disc 3 is connected to the first pole lug 3011. The integration of the cover 100 is improved, which is beneficial to the use of the cover 100, thereby improving the performance of the cover 100. When the cover 100 is used for the battery cell 300, it is beneficial to assemble the cover 100 with other components of the battery cell 300, simplify the assembly operation steps of the battery cell 300, reduce the assembly difficulty, and improve the assembly efficiency.

[0096] According to some embodiments of the present invention, referring to Figure 2 , Fig. 9 and Fig.10The pole 2 is passed through the cover body 1, and a first insulating separator 4 and a sealing member 7 are provided between the outer peripheral surface of the pole 2 and the cover body 1. The sealing member 7 is sleeved on the pole 2, and the first insulating separator 4 is provided on the outer peripheral side of the sealing member 7 and the pole 2.

[0097] For example, in Figure 2 , Fig. 9 and Fig.10 In the example, the upper end of the pole 2 passes through the cover body 1, the seal 7 is annular, the seal 7 is sleeved on the outer peripheral surface of the upper end of the pole 2, the lower end surface of the seal 7 is in contact with the lower end of the pole 2, the first insulating separator 4 is sleeved on the outer peripheral side of the lower end of the seal 7 and the outer peripheral side of the lower end of the pole 2, the upper end of the seal 7 is located between the cover body 1 and the pole 2, and the seal 7 has an insulating effect. In this way, through the cooperation of the first insulating member 203 and the seal 7, the insulation between the cover body 1 and the pole 2 is effectively guaranteed, thereby effectively avoiding the current on the pole 2 from flowing to the cover body 1, which is beneficial to the current carrying on the pole 2. When the cover 100 is used for the battery cell 300, it is beneficial to the long-term normal use of the battery cell 300. From the outside, the pole 2 and the cover body 1 compress the seal 7 and the first insulating member 203, thereby improving the sealing performance of the cover 100. In addition, the first insulating separator 4 and the seal 7 can separate the pole 2 and the cover body 1, thereby avoiding mutual friction between the pole 2 and the cover body 1, which is beneficial to the long-term use of the pole 2 and the cover body 1.

[0098] According to some embodiments of the present invention, referring to Figure 2 , Fig. 9 and Fig.10 The cover plate 100 further includes a connector 6 and a second insulating separator 5 , wherein the connector 6 is connected to one end of the pole 2 away from the first collecting disc 3 along the thickness direction of the first collecting disc 3 , and the second insulating separator 5 is arranged between the connector 6 and the cover plate body 1 .

[0099] For example, in Figure 2 , Fig. 9 and Fig.10In the example, the upper end of the pole 2 passes through the first insulating separator 4, the cover body 1, the second insulating member 302 and the connector 6, and is riveted and welded to the connector 6. The lower end of the second insulating separator 5 is between the outer peripheral surface of the first pole section 21 and the cover body 1, and the lower end surface of the second insulating separator 5 contacts the upper end surface of the seal 7. In this way, the connector 6 can limit the upper end of the pole 2, thereby preventing the pole 2 from moving downward and separating from the cover body 1, thereby improving the connection stability between the pole 2 and the cover body 1. In addition, the connector 6 cooperates with the upper end of the pole 2, and through the cooperation between the pole 2 and the connector 6, the tightness of the overall connection between the pole 2, the first insulating separator 4, the cover body 1, the seal 7, the second insulating separator 5 and the connector 6 is strengthened, thereby improving the integrity of the cover 100, which is more conducive to the use of the cover 100. Moreover, the sealing of the assembly of the connector 6, the pole 2 and the cover body 1 is also improved, thereby improving the sealing of the cover 100. In addition, when the cover plate 100 is used for the battery cell 300, the current of the first current collecting plate 3 can smoothly flow through the pole 2 and then flow out, shortening the flow path of the current and reducing the structural impedance of the battery cell 300. Moreover, the second insulating separator 5 is used to separate the connector 6 from the cover plate body 1, which can avoid the short circuit of the battery cell 300 caused by the electrical connection between the connector 6 and the cover plate body 1.

[0100] Further, refer to Figure 2 A second insulating spacer 5 groove 33 is formed on the second insulating spacer 5, and the connecting member 6 is fitted in the second insulating spacer 5 groove 33. The connecting member 6 is insulated from the cover body 1 by the second insulating spacer 5. For example, Figure 2 In the example, a second insulating separator groove 51 is formed on the upper side of the second insulating separator 5, the lower side of the connecting member 6 abuts against the bottom wall of the second insulating separator groove 51, and the upper end of the pole 2 passes through the second insulating separator groove 51 and is connected to the connecting member 6.

[0101] In this way, the second insulating separator groove 51 can have a positioning effect on the connector 6, thereby facilitating the rapid assembly of the connector 6 and the second insulating separator 5, thereby improving the assembly efficiency and assembly accuracy of the connector 6 and the second insulating separator 5. In addition, the second insulating separator groove 51 has a limiting effect on the connector 6, thereby preventing the connector 6 from rotating in the plane where the second insulating separator 5 is located, thereby improving the connection stability of the connector 6 and the second insulating separator 5, and improving the assembly stability of the cover 100. In addition, the lower end of the second insulating separator 5 can insulate and separate the pole 2 and the cover body 1. When the cover 100 is used for the battery cell 300, it can effectively prevent the current on the pole 2 from flowing to the cover body 1, thereby preventing the pole 2 and the cover body 1 from short circuiting, thereby facilitating the normal use of the cover body 1. Moreover, when the cover 100 is used for the battery cell 300, the welding (for example, laser welding) area of ​​the first collector 3 and the pole ear of the battery cell 300 is increased by the connector 6.

[0102] According to some embodiments of the present invention, referring to Figure 2 , Fig. 9 and Fig.10 The pole 2 includes a first pole segment 21 and a second pole segment 22 connected to each other. The first pole segment 21 passes through the cover body 1 and the second insulating separator 5 and is connected to the connector 6. The second pole segment 22 is located on the side of the cover body 1 facing the first current collecting disc 3, and the second pole segment 22 is connected to the first current collecting disc 3. For example, in Figure 2 , Fig. 9 and Fig.10 In the example, the first pole segment 21 extends in the up-down direction, the upper end of the first pole segment 21 passes through the cover body 1 and the second insulating separator 5 and is connected to the connector 6, the lower end of the first pole segment 21 is connected to the upper side of the second pole segment 22, the second pole segment 22 is located at the lower side of the cover body 1, and the lower side of the second pole segment 22 is connected to the upper surface of the first current collecting plate 3. In this way, the second pole segment 22 limits the pole 2 from the lower side of the cover body 1, restricting the pole 2 from moving upward, thereby improving the connection stability between the pole 2 and the cover body 1, and further improving the overall stability of the cover 100.

[0103] According to some embodiments of the present invention, referring to Figure 2 , Fig. 9 and Fig.10 A cover plate through hole 11 is formed on the cover plate body 1, the first pole segment 21 passes through the cover plate through hole 11, at least a portion of the seal 7 is arranged between the outer peripheral surface of the first pole segment 21 and the inner peripheral wall of the cover plate through hole 11, and the first insulating separator 4 is arranged on the outer peripheral side of the seal 7 and the second pole segment 22.

[0104] For example, in Figure 2 , Fig. 9 and Fig.10 In the example, the cover plate through hole 11 is along the thickness direction of the cover plate body 1 (ie Figure 2 The upper end of the seal 7 (i.e., at least a portion of the seal 7) penetrates the cover body 1. The upper end of the seal 7 (i.e., at least a portion of the seal 7) is located between the outer peripheral surface of the first pole segment 21 and the inner peripheral wall of the cover through hole 11, and the first insulating separator 4 is sleeved on the outer peripheral side of the lower end of the seal 7 and the outer peripheral side of the second pole segment 22. With such a configuration, the cover through hole 11 is conducive to positioning the pole 2, thereby facilitating the assembly of the pole 2 and the cover body 1, and improving the assembly efficiency of the cover 100. In addition, the cover body 1 is separated and insulated from the first pole segment 21 by the above-mentioned at least a portion of the seal 7, and the cover body 1 is separated and insulated from the second pole segment 22 by the seal 7 and the first insulating separator 4, thereby effectively ensuring the separation and insulation of the cover body 1 and the pole 2, and then when the cover 100 is used for the battery cell 300, it can effectively avoid the short circuit between the pole 2 and the cover body 1, which is conducive to the normal use of the cover body 1. It should be noted that the seal 7 can be entirely located between the outer circumferential surface of the first pole segment 21 and the inner circumferential wall of the cover plate perforation 11 to insulate the first pole segment 21 from the cover plate perforation 11, and the upper part of the first insulating partition 4 separates the upper surface of the second pole segment 22 from the lower surface of the cover plate body 1 to achieve an insulated connection between the second pole segment 22 and the cover plate body 1.

[0105] For example, in Figure 2 , Fig. 9 and Fig.10 In the example, the first insulating separator 4 and the second insulating separator 5 are respectively located on both sides of the thickness direction of the cover body 1, the free end of the first pole segment 21 passes through the first insulating separator 4, the cover body 1 and the second insulating separator 5 in sequence, the second pole segment 22 is located between the first insulating separator 4 and the first current collecting disk 3, and a part of the lower side of the second insulating separator 5 is located between the outer peripheral surface of the first pole segment 21 and the inner wall of the cover through hole 11. Thus, the second pole segment 22 is insulated and separated from the cover body 1 by the first insulating separator 4, and the second insulating separator 5 can insulate and separate a part of the first pole segment 21 from the cover body 1, so that the pole 2 and the cover body 1 are insulated. Connection, when the cover 100 is used for the battery cell 300, it can effectively prevent the current on the pole 2 from flowing to the cover body 1, thereby preventing a short circuit between the pole 2 and the cover body 1, and thus facilitating the normal use of the pole 2 and the cover body 1. In addition, the first insulating separator 4 and the second insulating separator 5 can separate the pole 2 and the cover body 1, thereby avoiding mutual friction between the pole 2 and the cover body 1, which is beneficial to the long-term use of the pole 2 and the cover body 1.

[0106] According to some embodiments of the present invention, referring to Figure 2 , Fig. 9 and Fig.10 The seal 7 includes a first seal section 71 and a second seal section 72. The first seal section 71 is disposed between the outer circumference of the pole 2 and the inner circumference of the cover plate through hole 11. The second seal section 72 is connected to an end of the first seal section 71 adjacent to the first current collecting plate 3. The second seal section 72 is located between the first insulating spacer 4 and the first pole section 21. For example, Figure 2 , Fig. 9 and Fig.10 In the example, the first sealing section 71 is located above the second sealing section 72, and the outer peripheral surface of the sealing member 7 is stepped. The first sealing section 71 is located between the outer peripheral surface of the first pole section 21 and the inner wall surface of the cover plate perforation 11, so as to insulate the first pole section 21 from the inner wall surface of the cover plate perforation 11, and the upper surface of the first sealing section 71 contacts the lower surface of the second insulating partition 5. The upper surface of the second sealing section 72 abuts against the lower surface of the edge of the cover plate perforation 11, and the lower surface of the second sealing section 72 contacts the upper surface of the second pole section 22. Such an arrangement strengthens the tightness of the connection between the pole 2 and the cover plate body 1 and the first insulating partition 4, thereby further improving the sealing of the cover plate 100, and further strengthening the insulation effect between the cover plate body 1 and the pole 2, thereby improving the performance of the cover plate 100. In addition, the sealing member 7 has a simple structure and is easy to produce, thereby improving the production efficiency of the sealing member 7.

[0107] Further, refer to Figure 3 , Figure 4 and Fig. 9 A rotation-stop groove 41 is formed on the surface of one side of the first insulating separator 4 adjacent to the first current collecting plate 3, and the second pole segment 22 fits in the rotation-stop groove 41. An extension portion 31 is provided on the first current collecting plate 3, and at least a portion of the outer periphery of the extension portion 31 fits in the rotation-stop groove 41, and the extension portion 31 is connected to a side of the second pole segment 22 away from the cover plate body 1.

[0108] For example, in Figure 3 and Fig. 9In the example, the anti-rotation groove 41 is formed on the lower surface of the first insulating partition 4, and one side of the second pole segment 22 is located in the anti-rotation groove 41. The shape of the outer peripheral surface of the above-mentioned side of the second pole segment 22 is roughly similar to the shape of the side wall of the anti-rotation groove 41. After the above-mentioned side of the second pole segment 22 is assembled in the anti-rotation groove 41, the outer peripheral surface of the second pole segment 22 fits with the side wall of the anti-rotation groove 41. The side of the extension portion 31 facing the center of the first current collecting disk 3 is connected to one side of the main body 35. The extension portion 31 is located in the anti-rotation groove 41. The shape of the outer peripheral surface of the extension portion 31 is roughly similar to the shape of the side wall of the anti-rotation groove 41. After the extension portion 31 is assembled in the anti-rotation groove 41, the outer peripheral surface of the extension portion 31 fits with the side wall of the anti-rotation groove 41, and the upper surface of the extension portion 31 is connected to the lower surface of the second pole segment 22. It should be noted that the above-mentioned "at least a portion" means that only a portion of the outer periphery of the extension portion 34 fits in the stop groove 1242, and the other portion of the outer periphery of the extension portion 34 is located outside the stop groove 1242. Of course, the entire outer periphery of the extension portion 34 can also fit in the stop groove 1242, which can be adjusted according to specific usage to better meet practical applications.

[0109] With such a configuration, after the first insulating separator 4 is assembled with the pole 2 and the first current collecting disc 3, the anti-rotation groove 41 has a limiting effect on the second pole segment 22 and the extension 31, which can effectively prevent the pole 2 and the first current collecting disc 3 from rotating in a plane perpendicular to the up and down direction, thereby improving the assembly stability of the cover body 1 with the first current collecting disc 3 and the pole 2. When the cover 100 is used for the battery cell 300, it also avoids the first current collecting disc 3 from rotating and contacting the second current collecting disc 201, thereby reducing the requirements for the machining accuracy of the pole core 301, the first pole lug 3011 and the second pole lug 3012, and improving the production efficiency of the pole core 301. In addition, when the first insulating separator 4 is assembled with the second pole segment 22 and the extension 31, the anti-rotation groove 41 facilitates the positioning of the second pole segment 22 and the extension 31, thereby helping to improve the rapid assembly of the first insulating separator 4 with the pole 2 and the first current collecting disc 3, thereby improving the assembly efficiency of the cover 100. It should be noted that the formation of the anti-rotation groove 41 can be in the following situations: First, the anti-rotation groove 41 can be formed by the lower surface of the first insulating separator 4 being recessed in a direction away from the first current collecting plate 3. Second, other components are provided on the lower surface of the first insulating separator 4 to define the anti-rotation groove 41 together with the first insulating separator 4. But it is not limited to this.

[0110] According to some embodiments of the present invention, referring to Figure 3 , Figure 4 and Fig. 9 , at least a portion of the outer periphery of the extension portion 31 matches the shape of the inner peripheral wall of the anti-rotation groove 41. Figure 3 , Figure 4 and Fig. 9In the example, the outer peripheral edge of the extension portion 31 away from the center of the first current collecting disk 3 is roughly arc-shaped, and the inner peripheral wall of the anti-rotation groove 41 is roughly arc-shaped. The arc shape of the outer peripheral edge of the extension portion 31 away from the center of the first current collecting disk 3 is roughly similar to the arc shape of the inner peripheral wall of the anti-rotation groove 41, and the outer peripheral edge of the extension portion 31 away from the center of the first current collecting disk 3 fits the inner peripheral wall of the anti-rotation groove 41. Therefore, it is conducive to the full contact between the outer peripheral edge of the first extension portion 31 away from the center of the first current collecting disk 3 and the inner wall of the anti-rotation groove 41, further improving the adaptability of the extension portion 31 and the anti-rotation groove 41, and strengthening the limiting effect of the anti-rotation groove 41 on the first current collecting disk 3, thereby further preventing the first current collecting disk 3 from rotating, and then improving the use stability of the cover plate 100. It should be noted that the above-mentioned "at least a part" means that only a part of the shape of the outer periphery of the extension portion 34 is compatible with the shape of the inner wall of the stop groove 1242, and the other part of the outer periphery of the extension portion 34 is not compatible with the shape of the inner wall of the stop groove 1242. Of course, the shape of the entire outer periphery of the extension portion 34 can also be compatible with the shape of the inner wall of the stop groove 1242, which can be adjusted according to specific usage to better meet practical applications.

[0111] According to some embodiments of the present invention, referring to Figure 3 and Fig. 9 A stop protrusion 42 is provided on one side surface of the first insulating spacer 4 adjacent to the first current collecting disc 3. The stop protrusion 42 and the side surface of the first insulating spacer 4 adjacent to the first current collecting disc 3 together define a stop groove 41. The side of the stop groove 41 adjacent to the center of the first current collecting disc 3 is open. For example, Figure 3 and Fig. 9 In the example, the stop protrusion 42 can be set in a "C" shape, and the shape of the stop protrusion 42 matches the shape of the end of the second pole segment 22 away from the first current collecting disk 3 and the shape of the side of the extension 31 away from the first current collecting disk 3, and the side of the extension 31 away from the center of the first current collecting disk 3 is assembled with the stop protrusion 42.

[0112] Such a configuration facilitates the extension portion 31 of the first current collecting disc 3 to be inserted into the stop groove 41 from the open side of the stop groove 41 in a direction perpendicular to the up and down direction, thereby facilitating the assembly of the extension portion 31 with the stop protrusion 42, thereby improving the assembly efficiency of the first insulating separator 4 and the first current collecting disc 3. In addition, it is also beneficial for the stop protrusion 42 to fully contact the second pole segment 22 and the extension portion 31, so as to improve the connection stability of the first insulating separator 4 with the pole 2 and the first current collecting disc 3. In addition, the structure of the stop protrusion 42 is simple, thereby simplifying the structure of the first insulating separator 4, which is more conducive to the mass production of the first insulating separator 4. But not limited to this. It should be noted that the stop protrusion 42 can also be composed of a plurality of cylinders or spheres (not shown in the figure), and the plurality of cylinders or spheres are arranged in a "C" shape or other shapes at intervals, or the plurality of cylinders or spheres are arranged in a "C" shape continuously, so that the stop protrusion 42 has a limiting and stop effect on the second pole segment 22. The anti-rotation protrusion 42 may also be configured as a structure of other shapes, as long as it has the function of limiting the rotation of the second pole segment 22 .

[0113] Optionally, the pole 2 in the cover plate 100 is connected to the first current collecting plate 3 by welding. As a result, the connection between the pole 2 and the first current collecting plate 3 is relatively firm, thereby preventing the first current collecting plate 3 from falling off the pole 2, thereby improving the long-term stability of the first current collecting plate 3 and the pole 2. In addition, the welding method is simple, thereby improving the feasibility of the welding machine process. But not limited to this.

[0114] According to some embodiments of the present invention, referring to Fig. 9, the thickness of the first insulating separator 4 is d1, wherein d1 satisfies: 0.5mm≤d1≤2.0mm. For example, the first insulating separator 4 is roughly a plate-like structure or a plate-like structure, and the thickness of the first insulating separator 4 refers to the thickness of the main body of the first insulating separator 4, and the main body of the first insulating separator 4 is the thickness of the first insulating separator 4 excluding the anti-rotation groove 41 and the anti-rotation protrusion 42. When the thickness d1 of the first insulating separator 4 is greater than 2mm, the material used in the first insulating separator 4 is more, thereby increasing the production cost of the first insulating separator 4, and further increasing the production cost of the cover 100. Moreover, the space occupied by the first insulating separator 4 will be increased, thereby increasing the overall volume of the cover 100, which is not conducive to the use of the cover 100. When the thickness d1 of the first insulating separator 4 is less than 0.5mm, the thickness of the first insulating separator 4 is small, and the production difficulty of the first insulating separator 4 is large, so that the first insulating separator 4 is not easy to produce. In addition, the wear resistance of the first insulating separator 4 is reduced, and the first insulating separator 4 is easily damaged by friction, which shortens the service life of the first insulating separator 4. Therefore, by setting the thickness d1 of the first insulating separator 4 to meet 0.5mm≤d1≤2.0mm, the production cost of the first insulating separator 4 is reduced, thereby reducing the production cost of the cover plate 100. In addition, the thickness of the first insulating separator 4 is moderate, which facilitates the production of the first insulating separator 4. In addition, the wear resistance of the first insulating separator 4 is improved, thereby preventing the first insulating separator 4 from being damaged and extending the service life of the first insulating separator 4.

[0115] Optionally, the first insulating separator 4 is an injection molded part. Thus, the molding quality of the first insulating separator 4 is improved, and the production efficiency and processing accuracy of the first insulating separator 4 are also improved. In addition, the integrity of the first insulating separator 4 is also improved, which is conducive to the long-term use of the first insulating separator 4.

[0116] According to some embodiments of the present invention, referring to Fig. 9 and Fig.10 A cover plate protrusion 12 is provided on one side surface of the cover plate body 1 adjacent to the first insulating separator 4 along the thickness direction of the cover plate body 1 (i.e., the up-down direction), and the cover plate through-hole 11 passes through the cover plate protrusion 12. A first insulating separator groove 43 is formed on one side surface of the first insulating separator 4 adjacent to the cover plate body 1 along the thickness direction of the cover plate body 1, and a first insulating separator through-hole 44 is formed on the bottom wall of the first insulating separator groove 43, and the first pole segment 21 passes through the first insulating separator through-hole 44, and the cover plate protrusion 12 is fitted in the first insulating separator groove 43.

[0117] For example, in Fig. 9 and Fig.10In the example, the first insulating spacer through-hole 44 penetrates the first insulating spacer 4 along the thickness direction of the first insulating spacer 4, the first insulating spacer through-hole 44 is opposite to the cover through-hole 11, and the first pole section 21 sequentially passes through the first insulating spacer through-hole 44 and the cover through-hole 11 to extend above the cover body 1. The lower surface of the cover protrusion 12 contacts the bottom wall of the first insulating spacer groove 43, the outer peripheral surface of the cover protrusion 12 contacts the inner side wall of the first insulating spacer groove 43, and the cover through-hole 11 penetrates the cover protrusion 12. Therefore, through the cooperation between the cover protrusion 12 and the first insulating spacer groove 43, the first insulating spacer groove 43 has a positioning effect on the cover protrusion 12, thereby facilitating the rapid assembly of the cover body 1 and the first insulating spacer 4, thereby improving the assembly efficiency of the cover 100. In addition, the structure of the cover protrusion 12 is simple, which is conducive to the assembly of the cover body 1 with other components, and also simplifies the structure of the cover body 1, which is conducive to the production and processing of the cover body 1.

[0118] Optionally, refer to Fig. 9 and Fig.10 The cover plate protrusion 12 is formed by a portion of the side surface of the cover plate body 1 away from the first current collecting plate 3 along the thickness direction of the cover plate body 1 protruding toward the side surface of the first current collecting plate 3. Fig. 9 and Fig.10 In the example, the cover plate protrusion 12 is formed by a portion of the upper surface of the cover plate body 1 protruding downward. In this way, the cover plate protrusion 12 has a simple structure and is easy to produce and process, thereby improving the production efficiency of the cover plate body 1. In addition, the integrity of the cover plate body 1 is improved, thereby improving the structural strength of the cover plate protrusion 12 and improving the stability of the cover plate body 1 in long-term use.

[0119] According to some embodiments of the present invention, referring to Fig. 9 and Fig.10 The cover plate protrusion 12 forms a cover plate groove 13 on the side surface of the cover plate body 1 away from the first collecting plate 3 along the thickness direction of the cover plate body 1, and at least a part of the second insulating separator 5 is fitted in the cover plate groove 13. For example, Fig. 9 and Fig.10In the example, a cover protrusion 12 is provided on the lower side of the cover body 1, and a cover groove 13 is formed at a corresponding position on the upper side of the cover body 1. The cover through hole 11 penetrates the bottom wall of the cover groove 13 and the cover protrusion 12, and the lower end of the second insulating separator 5 (i.e., at least a part of the second insulating separator 5) is fitted in the cover groove 13, and the outer peripheral surface of the lower end of the second insulating separator 5 is in contact with the inner wall surface of the cover groove 13. In this way, the cover groove 13 can have a positioning effect on the second insulating member 5, so as to facilitate the assembly of the cover body 1 and the second insulating separator 5, thereby improving the assembly efficiency of the cover 100. In addition, the cover groove 13 can have a limiting effect on the second insulating member 5, which can prevent the second insulating separator 5 from rotating in the plane of the cover body 1, thereby improving the connection stability between the cover body 1 and the second insulating separator 5, and further improving the use stability of the cover 100. It should be noted that the second insulating separator 5 can also be fully fitted into the cover groove 13 to effectively separate the cover body 1 and the connector 6. The matching conditions between the second insulating separator 5 and the cover groove 13 can be set according to specific usage to better meet practical applications.

[0120] Optionally, the connector 6 is a polygon or an oblong shape. For example, when the connector 6 is a polygon, the contact area between the connector 6 and the second insulating separator 5 is larger, which increases the pressing area of ​​the connector 6 on the second insulating separator 5, thereby improving the tightness of the assembly of the connector 6 and the second insulating separator 5, and further improving the connection tightness of the various components of the cover plate 100. When the connector 6 is an oblong shape, the contact area and welding surface of the connector 6 and the second insulating separator 5 are increased. In addition, the connector 6 has a simple structure and is easy to produce, thereby improving the production efficiency of the connector 6. In addition, the four corners of the connector 6 can be set to an arc shape, which is convenient for installation and transportation and improves the aesthetics of the connector 6.

[0121] According to some embodiments of the present invention, referring to Figure 5, the width of the connector 6 is w, and the diameter of the pole 2 is d2, wherein w and d2 satisfy: 3.5mm≤w-d2≤6mm. For example, when the difference between the width w of the connector 6 and the diameter d2 of the pole 2 is greater than 6mm, the connection area between the connector 6 and the pole 2 is small, and the width of the connector 6 is large, which reduces the connection stability between the connector 6 and the pole 2. When the difference between the width w of the connector 6 and the diameter d2 of the pole 2 is less than 3.5mm, the distance between the edge of the connector 6 in the width direction and the edge of the upper end of the pole 2 is small, and the width of the connector 6 is also small, which reduces the structural strength of the connector 6 and is not conducive to the long-term use of the connector 6. Therefore, by setting the width w of the connecting piece 6 and the diameter d2 of the pole 2 to satisfy 3.5mm≤w-d2≤6mm, the distance between the edge of the connecting piece 6 in the width direction and the edge of the upper end of the pole 2 is moderate, which improves the structural strength of the connecting piece 6 and the connection stability between the connecting piece 6 and the pole 2, which is beneficial to the long-term and stable use of the connecting piece 6 and the pole 2.

[0122] Optionally, the connector 6 is an aluminum stamping part. As a result, the production and processing efficiency of the connector 6 is high, and the processing accuracy is also high, which is conducive to the long-term use of the connector 6. In addition, the flatness of the connector 6 is improved by aluminum stamping. In addition, the aluminum part has good electrical conductivity, which facilitates the current to pass through the connector 6.

[0123] Optionally, the seal 7 is injection molded with fluororubber. As a result, the fluororubber has excellent corrosion resistance and atmospheric aging resistance, thereby extending the service life of the seal 7. In addition, through injection molding, the molding quality and overall stability of the seal 7 are improved, and the production efficiency and processing accuracy of the seal 7 are also improved, which is more conducive to the long-term use of the seal 7.

[0124] Optionally, the cover body 1 is a steel stamping part. As a result, the production and processing efficiency of the cover body 1 is high, and the processing accuracy is also high, thereby improving the connection tightness between the cover body 1 and the pole 2 and the first collector plate 3. Moreover, the flatness of the cover body 1 is also improved. In addition, steel is corrosion-resistant, which is also conducive to the long-term use of the cover body 1. In addition, steel has good conductivity, which is conducive to the electrical connection between the second collector plate 201 and the cover body 1, so as to facilitate the normal use of the battery cell 300.

[0125] According to some embodiments of the present invention, referring to Figure 2 and Figure 4 The first current collecting plate 3 is provided with a connecting protrusion 32 which protrudes away from the cover plate body 1 along the thickness direction of the first current collecting plate 3. Figure 2 and Figure 4In the example, the connection protrusion 32 is formed by a part of the first current collecting disc 3 protruding in a direction away from the cover body 1. With such a configuration, when the cover 100 is used for the battery cell 300, the first current collecting disc 3 is connected to the first pole lug 3011 of the battery cell 300 through the connection protrusion 32, which facilitates the interference fit between the first current collecting disc 3 and the first pole lug 3011, thereby improving the welding yield when the first current collecting disc 3 is connected to the first pole lug 3011 by welding, thereby improving the connection strength between the first current collecting disc 3 and the first pole lug 3011. In addition, the structure of the connection protrusion 32 is simple, thereby simplifying the structure of the first current collecting disc 3, which is conducive to the mass production of the first current collecting disc 3.

[0126] Further, refer to Figure 4 The connecting protrusion 32 includes a first protrusion portion 321 and a second protrusion portion 322, one end of the first protrusion portion 321 is connected to one end of the second protrusion portion 322, and the other end of the first protrusion portion 321 and the other end of the second protrusion portion 322 extend in a direction away from each other.

[0127] For example, in Figure 4 In the example, the connection protrusion 32 can be set in a "V" shape, and one end of the first protrusion 321 close to the center of the first current collecting disk 3 is connected to one end of the second protrusion 322 close to the center of the first current collecting disk 3, and the other end of the first protrusion 321 and the other end of the second protrusion 322 both extend in a direction away from the center of the first current collecting disk 3, and the first protrusion 321 and the second protrusion 322 are symmetrical about the center line of the first current collecting disk 3. In this way, the structure of the connection protrusion 32 is simple and the design is reasonable, so that after the first current collecting disk 3 is connected to the first pole ear 3011 of the battery cell 300, the stability of the overall connection between the first current collecting disk 3 and the first pole ear 3011 is improved, and the first current collecting disk 3 is prevented from shaking or rotating, thereby improving the use stability of the battery cell 300. In addition, the processing difficulty of the connection protrusion 32 is low, thereby reducing the processing difficulty of the first current collecting disk 3 and improving the production efficiency of the first current collecting disk 3.

[0128] Combination Figure 4 and Figure 5, the angle between the first protrusion 321 and the second protrusion 322 is β, wherein β satisfies: 20°≤β≤80°. For example, when the angle β between the first protrusion 321 and the second protrusion 322 is greater than 80°, the distance between the other end of the first protrusion 321 and the other end of the second protrusion 322 is large, so that the distance between the welding points at the edge of the first current collecting disk 3 is large, which reduces the connection stability between the first current collecting disk 3 and the first pole lug 3011 of the battery cell 300. When the angle β between the first protrusion 321 and the second protrusion 322 is less than 20°, the distance between the other end of the first protrusion 321 and the other end of the second protrusion 322 is small, and the distance between the two opposite sides of the first protrusion 321 and the second protrusion 322 is small, which reduces the uniformity of the distribution of the welding points of the first current collecting disk 3, thereby reducing the connection stability of the first current collecting disk 3. Therefore, by setting the included angle β between the first protrusion 321 and the second protrusion 322 to satisfy 20°≤β≤80°, the positions of the first protrusion 321 and the second protrusion 322 are moderately distributed, thereby improving the uniformity of the distribution of the welding points of the first current collecting disc 3, thereby improving the connection stability of the first current collecting disc 3, and facilitating the long-term use of the first current collecting disc 3.

[0129] Optionally, refer to Figure 4 , a notch 34 is formed on one side edge of the first current collecting plate 3 away from the second current collecting plate 201. Figure 4 In the example, the notch 34 is recessed toward the center direction of the first current collecting disc 3, and the notch 34 can be set in a semicircular shape. Therefore, when the first current collecting disc 3 is connected to the first pole ear 3011 of the battery cell 300 by welding, during the cooling process of the first current collecting disc 3 after welding, due to different thermal expansion coefficients, some areas shrink more than other areas, which will cause residual stress in the welding area. The setting of the notch 34 can relieve the above residual stress, thereby preventing the first current collecting disc 3 and the first pole ear 3011 of the battery cell 300 from being thermally deformed during welding and causing poor welding, thereby improving the connection strength between the first current collecting disc 3 and the first pole ear 3011 of the battery cell 300. For example, the notch 34 is located between the above-mentioned other end of the first protrusion 321 and the above-mentioned other end of the second protrusion 322. Therefore, the notch 34 is formed at a position near the middle of the edge of the first current collecting disc 3 to better relieve the above residual stress. But it is not limited to this.

[0130] According to some embodiments of the present invention, referring to Figure 2 and Figure 4The connection protrusion 32 is formed by a portion of the side surface of the first current collecting disc 3 adjacent to the pole 2 along the thickness direction of the first current collecting disc 3 protruding toward the side surface away from the pole 2, and the connection protrusion 32 forms a groove 33 on the side surface of the first current collecting disc 3 adjacent to the pole 2 along the thickness direction of the first current collecting disc 3 to form the connection protrusion 32 on the side surface away from the pole 2. For example, in Figure 2 and Figure 4 In the example, the groove 33 is formed by a portion of the upper surface of the first current collecting disc 3 being depressed downward to form a connecting protrusion 32, and the connecting protrusion 32 forms a V-shaped groove 33 on the upper surface of the first current collecting disc 3. In this way, the thickness of the area where the connecting protrusion 32 is located on the first current collecting disc 3 is reduced, thereby shortening the path of the current flowing through the connecting protrusion 32, which is more conducive to the use of the first current collecting disc 3 and further reduces the structural impedance. In addition, the structure of the connecting protrusion 32 and the groove 33 is simple, the processing difficulty is relatively low, the production cost of the first current collecting disc 3 is reduced, and the production efficiency of the first current collecting disc 3 is improved.

[0131] Optionally, refer to Fig. 9 and Fig.10 , the depth of the groove 33 is h3, wherein h3 satisfies: 0mm<h3≤2mm. When the depth h3 of the groove 33 is greater than 2mm, the height of the side wall of the groove 33 is high, thereby reducing the structural strength of the connecting protrusion 32, and further reducing the structural strength of the first current collecting plate 3. When the depth h3 of the groove 33 is equal to 0mm, the lower surface of the first current collecting plate 3 is completely in contact with the first pole ear 3011 of the battery cell 300 and welded, the welding area is large, the welding cost is high, and it is not conducive to the connection between the first current collecting plate 3 and other components of the battery cell 300. Therefore, by setting the depth h3 of the groove 33 to satisfy 0mm<h3≤2mm, the structural strength of the connecting protrusion 32 is improved, and further the structural strength of the first current collecting plate 3 is improved. In addition, the welding cost of the first current collecting plate 3 is reduced, which is also conducive to the connection between the first current collecting plate 3 and other components of the battery cell 300.

[0132] Optionally, the first current collecting disc 3 and the pole 2 are both formed by stamping of aluminum. The aluminum part has a certain structural strength. Thus, the structural strength of the first current collecting disc 3 and the pole 2 is improved, which is conducive to the long-term and stable use of the first current collecting disc 3 and the pole 2. In addition, by stamping of aluminum, the flatness of the first current collecting disc 3 and the pole 2 is improved, thereby improving the performance of the first current collecting disc 3 and the pole 2. Moreover, the lower surface of the pole 2 adopts a one-sided design, which facilitates the welding of the pole 2 and the first current collecting disc 3. In addition, the aluminum part is conductive, which facilitates the current to pass through the first current collecting disc 3 and the pole 2. But it is not limited to this.

[0133] According to the cover plate assembly 200 of the second embodiment of the utility model, refer to Figure 5, including a cover plate 100 and a second current collecting disc 201. The cover plate 100 is the cover plate 100 according to the embodiment of the first aspect of the utility model, the second current collecting disc 201 is connected to the cover plate body 1 of the cover plate 100, the second current collecting disc 201 is insulated from the pole 2 of the cover plate 100 and the first current collecting disc 3, the second current collecting disc 201 and the first current collecting disc 3 are respectively connected to the pole lugs with opposite polarities, for example, the first current collecting disc 3 is connected to the first pole lug 3011, and the second current collecting disc 201 is connected to the second pole lug 3012.

[0134] For example, in Figure 5 and Fig.11 In the example, the second current collecting disc 201 is located on the lower side of the cover body 1, the upper side of the second current collecting disc 201 is connected to the lower side of the cover body 1, and the second current collecting disc 201 is opposite to the first current collecting disc 3. Such a configuration facilitates the connection between the cover 100 and the second current collecting disc 201, thereby improving the assembly efficiency of the cover 100 and the second current collecting disc 201. In addition, a short circuit between the second current collecting disc 201 and the pole 2 and the first current collecting disc 3 of the cover 100 is avoided, so that the second current collecting disc 201 and the cover 100 can be used normally. When the cover assembly 200 is used for the battery cell 300, the battery cell 300 has a first pole ear 3011 and a second pole ear 3012, the first pole ear 3011 is connected to the first current collecting disc 3, the second pole ear 3012 is connected to the second current collecting disc 201, and the first pole ear 3011 and the second pole ear 3012 are opposite in polarity. The current-carrying flow path for the positive electrode of the battery cell 300 flows through the first pole ear 3011, the first current collecting disk 3 and the pole 2 in sequence and then is led out. The current-carrying flow path for the negative electrode of the battery cell 300 flows through the second pole ear 3012, the second current collecting disk 201 and the cover body 1 in sequence and then is led out. Therefore, the current-carrying flow paths at the positive and negative electrodes of the battery cell 300 are both shorter, which further reduces the structural impedance of the battery cell 300 and is more conducive to the use of the battery cell 300.

[0135] According to some optional embodiments of the present invention, referring to Figure 6 The second current collecting plate 201 includes a first connection portion 2011, a second connection portion 2012 and a third connection portion 2013 connected in sequence. The second current collecting plate 201 is connected to the cover plate 100 through the third connection portion 2013, the second connection portion 2012 is connected between the third connection portion 2013 and the first connection portion 2011, and the second current collecting plate 201 is connected to the second pole lug 3012 through the first connection portion 2011.

[0136] For example, in Figure 6In the example, the lower end of the second connection part 2012 is connected to the upper side of the first connection part 2011, the lower side of the third connection part 2013 is connected to the upper end of the second connection part 2012, and the upper surface of the third connection part 2013 is connected to the lower surface of the cover body 1 (for example, welding). When the second current collecting disc 201 is used for the battery cell 300, the lower side of the first connection part 2011 is connected to the upper side of the second pole ear 3012. As a result, the second connection part 2012 can support the first connection part 2011 and the third connection part 2013, that is, it plays the role of a reinforcing rib, thereby improving the structural strength of the second current collecting disc 201, which is conducive to the long-term and stable use of the second current collecting disc 201. Moreover, the connection flatness between the second current collecting disc 201 and the second pole ear 3012 is better, and it is not easy to collapse when subjected to force. In addition, the third connection part 2013 is connected to the cover body 1, so that the second current collecting disc 201 is firmly connected to the cover body 1, thereby improving the stability of the cover assembly 200. In addition, the first connection portion 3011 is connected to the second pole tab 3012 , and the contact area between the first connection portion 2011 and the second pole tab 3012 is relatively large, so that the first connection portion 2011 and the second pole tab 3012 are conveniently and firmly connected.

[0137] According to some embodiments of the present invention, referring to Figure 6 , the first connection portion 2011 and the third connection portion 2013 both extend in a direction perpendicular to the central axis of the cover plate 100, and the second connection portion 2012 is vertically connected between the first connection portion 2011 and the third connection portion 2013. Figure 6 In the example, the first connection portion 2011 and the third connection portion 2013 are parallel to the surface of the first current collecting disc 3, and the second connection portion 2012 is perpendicular to the first connection portion 2011 and the third connection portion 2013. Such a configuration improves the flatness of the second current collecting disc 201, thereby facilitating the connection of the second current collecting disc 201 with the cover body 1 through the third connection portion 2013, improving the welding yield of the second current collecting disc 201 and the cover body 1, and effectively preventing the second current collecting disc 201 from falling off the cover 100, thereby improving the use stability of the second current collecting disc 201. In addition, the second current collecting disc 201 has a simple structure and is easy to produce and process, thereby improving the production efficiency of the second current collecting disc 201 and reducing the production cost of the second current collecting disc 201.

[0138] According to some embodiments of the present invention, referring to Figure 6 The first connection portion 2011 includes two first sub-connection portions 201a spaced apart from each other, each first sub-connection portion 201a includes a first side 201b and a second side 201c perpendicular to each other, the first side 201b of the two first sub-connection portions 201a are opposite to each other, and the second side 201c of the two first sub-connection portions 201a are located on the same straight line. Figure 6 In the example, the two first sub-connecting parts 201a are respectively located on both sides of the second connecting part 2012, and the first sub-connecting part 201a can be set to be fan-shaped, and the first side 201b and the second side 201c are two straight sides of the fan. As a result, the two opposite side surfaces of the second current collecting disk 201 along the extension direction of the second side 201c can be connected to the second pole lug 3012 of the battery cell 300, thereby improving the overall stability of the connection between the second current collecting disk 201 and the second pole lug 3012, and the connection is firm, thereby preventing the second current collecting disk 201 from falling off the second pole lug 3012, thereby improving the performance of the battery cell 300. In addition, the contact area between the second current collecting disk 201 and the second pole lug 3012 is increased through the two first sub-connecting parts 201a, thereby improving the connection strength between the second current collecting disk 201 and the second pole lug 3012 and reducing the structural impedance of the battery cell 300.

[0139] Combination Figure 6 , the second connection part 2012 includes two second sub-connection parts 201d arranged at intervals, one side of one second sub-connection part 201d is connected to the first side edge 201b and the second side edge 201c of one first sub-connection part 201a, and one side of the other second sub-connection part 201d is connected to the first side edge 201b and the second side edge 201c of the other first sub-connection part 201a. Figure 6 In the example, the two second sub-connection parts 201d correspond to the two first sub-connection parts 201a one by one, and the two second sub-connection parts 201d are arranged at intervals along the arrangement direction of the two first sub-connection parts 201a. The second sub-connection parts 201d can be arranged vertically, and the second sub-connection parts 201d are bent and extended along the first side edge 201a and the second side edge 201b, and the bend is an arc-shaped transition. In this way, the structure of the second sub-connection part 201d is simple, thereby simplifying the structure of the second current collecting disk 201, reducing the production difficulty of the second current collecting disk 201, and improving the production efficiency of the second current collecting disk 201. In addition, the structural strength of the second sub-connection part 201d is strengthened, thereby further improving the supporting effect of the second connection part 2012 on the first connection part 2011 and the third connection part 2013, thereby improving the structural strength of the second current collecting disk 201.

[0140] Combination Figure 6The third connection part 2013 includes a third sub-connection part 201e and a fourth sub-connection part 201f, the third sub-connection part 201e is connected between the other side of the two second sub-connection parts 201d opposite to the first side 201b of the two first sub-connection parts 201a, one side of the fourth sub-connection part 201f is connected to the other side of the two second sub-connection parts 201d opposite to the second side 201c of the two first sub-connection parts 201a and the third sub-connection part 201e, and the other side of the fourth sub-connection part 201f extends in a direction away from the first connection part 2011.

[0141] For example, in Figure 6 In the example, the third connection part 2013 is roughly in a "T" shape, the third sub-connection part 201e is a vertical section of the "T", the fourth sub-connection part 201f is a horizontal section of the "T", and the two sides of the third sub-connection part 201e in the width direction are respectively connected to the side of the two second sub-connection parts 201d away from the two first side edges 201b (that is, the upper side of the second sub-connection part 201d opposite to the first side edges 201b). The plane where the fourth sub-connection part 201f is located is parallel to the plane where the first sub-connection part 201a is located, the side of the fourth sub-connection part 201f facing the first connection part 2011 is connected to the side of the two second sub-connection parts 201d away from the two second side edges 201c, and the side of the fourth sub-connection part 201f facing the first connection part 2011 is connected to the side of the third sub-connection part 201e flush with the second side edges 201c.

[0142] In this way, the two second sub-connection parts 201d are connected together through the third sub-connection part 201e, so that the second current collecting disc 201 is connected as a whole, thereby improving the structural strength of the second current collecting disc 201. Moreover, the third sub-connection part 201e facilitates the connection of the second current collecting disc 201 with the cover plate body 1. In addition, the fourth sub-connection part 201f is set to increase the area of ​​the third connection part 2013, and when the second current collecting disc 201 is connected to the cover plate 100, the connection stability between the upper surface of the second current collecting disc 201 and the lower surface of the cover plate body 1 is improved. In addition, the second current collecting disc 201 has a simple structure and is easy to produce, thereby improving the production efficiency of the second current collecting disc 201. Moreover, the fourth sub-connection part 201f has a reinforcing rib function, which improves the strength and flatness of the second current collecting disc 201 and improves the welding yield.

[0143] According to some embodiments of the present invention, referring to Figure 7 and Fig.11 The cover plate assembly 200 further includes a substrate 202, which is connected to a side of the cover plate 100 away from the second current collecting plate 201 along the thickness direction (i.e., the up-down direction) of the cover plate 100, and an opening 2021 is formed on the substrate 202, and the pole 2 is exposed from the opening 2021. Figure 7and Fig.11 In the example, the substrate 202 is located above the cover body 1, and the edge of the opening 2021 matches the outer peripheral edge of the cover body 1. In this way, the substrate 202 can cover a part of the cover 100, thereby improving the protective effect of the substrate 202 on the cover 100, thereby extending the service life of the cover 100. In addition, the appearance of the cover assembly 200 is relatively simple, which improves the beauty of the cover assembly 200. In addition, it is conducive to the welding of the first collector plate 3 and the first pole ear 3011, so as to facilitate the assembly of the battery cell 300.

[0144] According to some embodiments of the present invention, referring to Fig. 9 and Fig.10 The outer periphery of the cover plate 100 has a step portion 14, and the edge of the opening 2021 has a matching portion 2022 extending toward the center of the opening 2021, and the matching portion 2022 is matched on the step portion 14. For example, in Fig. 9 and Fig.10 In the example, the edge of the cover body 1 is formed into a step portion 14, and the matching portion 2022 is also arranged in a step shape. Such an arrangement facilitates the assembly and pressing of the cover body 1 and the substrate 202, improves the connection stability of the cover body 1 and the substrate 202, thereby improving the feasibility of the process, and further improving the assembly efficiency and assembly stability of the cover 100 and the substrate 202. In addition, the cover body 1 and the substrate 202 are not prone to relative movement, thereby improving the stability of the substrate 202 in long-term use.

[0145] According to some embodiments of the present invention, referring to Figure 7 On the side where the second current collecting plate 201 is located, the minimum distance between the edge of the opening 2021 and the outer periphery of the substrate 202 is d4, where d4 satisfies: 1.5 mm≤d4≤4 mm.

[0146] For example, when the minimum distance d4 between the edge of the opening 2021 and the outer periphery of the substrate 202 is greater than 4 mm, according to the matching condition between the edge of the opening 2021 and the edge of the cover body 1, the cross-sectional area of ​​the cover body 1 is small, so that the contact area between the cover body 1 and the second current collecting disk 201 is small, thereby reducing the welding area between the cover body 1 and the second current collecting disk 201. When the cover assembly 200 is used for the battery cell 300, the structural impedance of the battery cell 300 is improved. When the minimum distance d4 between the edge of the opening 2021 and the outer periphery of the substrate 202 is less than 1.5 mm, on the side where the second current collecting disk 201 is located, the distance between the edge of the opening 2021 and the outer periphery of the substrate 202 is small, and the welding between the substrate 202 and the cover body 1 and the welding between the substrate 202 and the outer shell 303 of the battery cell 300 will have mutual influence, thereby reducing the welding yield of the cover assembly 200. In addition, the structural strength of the substrate 202 is reduced, and the service life of the substrate 202 is shortened. Thus, by setting the minimum distance d4 between the edge of the opening 2021 and the outer periphery of the substrate 202 to satisfy 1.5 mm ≤ d4 ≤ 4 mm, the cross-sectional area of ​​the cover body 1 is increased, thereby increasing the contact surface area between the cover body 1 and the second current collecting disk 201, and further reducing the structural impedance of the battery cell 300 when the cover assembly 200 is used for the battery cell 300. In addition, mutual influence between the welding of the substrate 202 and the cover body 1 and the welding of the substrate 202 and the shell 303 of the battery cell 300 is prevented, thereby improving the welding yield of the cover assembly 200.

[0147] According to some embodiments of the present invention, referring to Fig.11 The cover plate assembly 200 further includes a first insulating member 203, and the first insulating member 203 is disposed between the base plate 202 and the first current collecting plate 3. Fig.11 In the example, the first insulating member 203 wraps the upper side and the outer peripheral surface of the first current collecting disc 3. Thus, the first insulating member 203 insulates the substrate 202 and the first current collecting disc 3, thereby preventing a short circuit between the substrate 202 and the first current collecting disc 3 when the cover assembly 200 is used for the battery cell 300, and also ensures that the current carrying flow of the first current collecting disc 3 flows out after passing through the pole 2, thereby enabling the cover assembly 200 to be used normally for a long time and reducing the structural impedance. For example, the first insulating member 203 can be set as an insulating glue so that the first insulating member 203 has a bonding effect, so that the first insulating member 203 is easy to use and has a low cost.

[0148] According to some embodiments of the present invention, referring to Fig. 9 and Fig.10, the thickness of the first insulating member 203 is h1, wherein h1 satisfies: 20um≤h1≤200um. For example, when the thickness h1 of the first insulating member 203 is greater than 200um, the material used in the first insulating member 203 is more, the cost of the first insulating member 203 is higher, and thus the cost of the cover plate 100 is higher. When the thickness h1 of the first insulating member 203 is less than 20um, the connection between the first insulating member 203 and the first current collecting plate 3 is weakened, thereby reducing the insulating effect of the first insulating member 203. Therefore, by setting the thickness h1 of the first insulating member 203 to satisfy 20um≤h1≤200um, the material used in the first insulating member 203 is reduced, thereby reducing the production cost of the first insulating member 203, and further reducing the production cost of the cover plate 100. In addition, the connection between the first insulating member 203 and the substrate 202 and the first current collecting plate 3 is strengthened, which is beneficial to the long-term use of the first insulating member 203 and also beneficial to the normal operation of the battery cell 300.

[0149] Optionally, at least one of the first current collecting disc 3 and the second current collecting disc 201 is a single-layer structural layer. The above-mentioned settings of the first current collecting disc 3 and the second current collecting disc 201 include the following situations: first, only the first current collecting disc 3 is a single-layer structural member; second, only the second current collecting disc 201 is a single-layer structural member; third, the first current collecting disc 3 and the second current collecting disc 201 are both single-layer structural members. Therefore, when the cover plate assembly 200 is used for the battery cell 300, the current on the first pole ear 3011 of the battery cell 300 can flow through the first current collecting disc 3 and flow out, and the current on the second pole ear 3012 of the battery cell 300 can flow through the second current collecting disc 201 and flow out, and the current can directly pass through the first current collecting disc 3 or the second current collecting disc 201 along the thickness direction of the first current collecting disc 3 or the second current collecting disc 201, thereby shortening the current flow path, reducing the structural impedance of the battery cell 300, facilitating the normal use of the battery cell 300, and improving the performance of the battery cell 300. In addition, the single-layer structure is simple in structure and uses less material, thereby reducing the production cost of the first collector plate 3 and the second collector plate 201, and further reducing the production cost of the cover plate assembly 200. It should be noted that "single-layer structural member" may refer to: the portion of the structural member itself that has no bending or overlapping along the thickness direction of the structural member. That is, the first collector plate 3 itself is a single-layer portion without bending or overlapping, and the second collector plate 201 itself is a single-layer portion without bending or overlapping.

[0150] Optionally, the second current collecting disc 201 is formed by stamping of copper material. Copper material has corrosion resistance and conductivity. Therefore, it is beneficial to the normal use of the second current collecting disc 201, and the structural strength of the second current collecting disc 201 is improved, which is beneficial to the long-term and stable use of the second current collecting disc 201. In addition, by stamping of copper material, the flatness of the second current collecting disc 201 is improved, thereby improving the performance of the second current collecting disc 201.

[0151] According to some optional embodiments of the present invention, the cover plate body 1 of the cover plate assembly 200 is connected to the second current collecting plate 201 by welding. As a result, the connection between the cover plate body 1 and the second current collecting plate 201 is relatively firm, thereby preventing the second current collecting plate 201 from falling off the cover plate assembly 200, thereby improving the structural strength of the cover plate assembly 200.

[0152] Optionally, the substrate 202 is a steel stamping part. As a result, the production and processing efficiency of the substrate 202 is high, and the processing accuracy is also high, thereby improving the assembly accuracy of the substrate 202 and the cover body 1. Moreover, the flatness of the substrate 202 is also improved. In addition, steel has corrosion resistance and electrical conductivity, which is also conducive to the long-term use of the substrate 202 and the electrical connection between the second collecting plate 201 and the substrate 202 through the cover body 1.

[0153] According to the battery cell 300 of the third aspect of the present utility model, refer to Figure 8 and Fig.11 , including a pole core 301 and a cover plate assembly 200. A first pole ear 3011 and a second pole ear 3012 are provided at one end of the pole core 301, and the first pole ear 3011 and the second pole ear 3012 have opposite polarities. The cover plate assembly 200 is a cover plate assembly 200 according to the embodiment of the second aspect of the utility model, and the cover plate assembly 200 is provided at the above-mentioned one end of the pole core 301, and the first current collecting plate 3 of the cover plate assembly 200 is connected to the first pole ear 3011, and the second current collecting plate 201 of the cover plate assembly 200 is connected to the second pole ear 3012.

[0154] For example, in Figure 8 and Fig.11 In the example of , the first pole ear 3011 and the second pole ear 3012 are both located at the upper end of the pole core 301, and the cover plate assembly 200 is located on the upper side of the first pole ear 3011 and the second pole ear 3012, and the first pole ear 3011 and the second pole ear 3012 are arranged relatively spaced apart. In this way, the cover plate assembly 200 can be directly connected to the first pole ear 3011 and the second pole ear 3012, thereby improving the assembly efficiency of the battery cell 300. In addition, a short circuit between the first pole ear 3011 and the second ear is avoided, thereby facilitating the long-term normal use of the battery cell 300. In addition, by making the first pole ear 3011 and the second pole ear 3012 located on the same side of the pole core 301, the exhaust channel can be set only on one side of the battery cell 300, thereby improving the space utilization of the battery cell 300.

[0155] For example, the first pole ear 3011 is a positive pole ear, and the second pole ear 3012 is a negative pole ear. The current flow path for the positive electrode of the battery cell 300 flows through the first pole ear 3011, the first current collecting plate 3 and the pole 2 in sequence and then leads out, and the current flow path for the negative electrode of the battery cell 300 flows through the second pole ear 3012, the cover body 1 and the substrate 202 in sequence and then leads out, so that the current flow paths at the positive and negative electrodes of the battery cell 300 are both shorter, further reducing the structural impedance of the battery cell 300, which is more conducive to the use of the battery cell 300.

[0156] Optionally, the second current collecting disc 201 is connected to the second pole lug 3012 by welding, and the first current collecting disc 3 is connected to the first pole lug 3011 by welding. For example, the second current collecting disc 201 is laser welded to the second pole lug 3012, and the first current collecting disc 3 is laser welded to the first pole lug 3011. As a result, the connection between the second current collecting disc 201 and the second pole lug 3012 is relatively firm, and the connection between the first current collecting disc 3 and the first pole lug 3011 is relatively firm, thereby preventing the second current collecting disc 201 from falling off from the second pole lug 3012, and preventing the first current collecting disc 3 from falling off from the first pole lug 3011, thereby improving the connection stability of the first current collecting disc 3 and the second current collecting disc 201, and improving the stability of the cover plate assembly 200. Moreover, compared with conventional torque welding, laser welding is used for connection, and the current flowing through the first current collecting plate 3 and the second current collecting plate 201 is not restricted, and the welding cost is low, thereby further reducing the production cost of the battery cell 300 and improving the welding yield and detectability of the battery cell 300. In addition, the welding method is simple, thereby improving the feasibility of the welding process.

[0157] According to some embodiments of the present invention, referring to Fig.11 The battery cell 300 further includes a second insulating member 302, and the second insulating member 302 is disposed between the first pole tab 3011 and the second pole tab 3012. Fig.11 In the example, the two sides of the lower side of the second insulating member 302 in the width direction are respectively connected to the first pole ear 3011 and the second pole ear 3012, and the upper side of the second insulating member 302 is connected to the lower side of the first current collecting plate 3. Therefore, by setting the second insulating member 302, the first pole ear 3011 and the second pole ear 3012 can be insulated, so as to avoid a short circuit between the second pole ear 3012 and the first pole ear 3011, so as to facilitate the normal use of the battery cell 300. For example, the second insulating member 302 can be set as an insulating glue so that the second insulating member 302 has a bonding effect, so that the use and operation of the second insulating member 302 is simple and the use cost is low.

[0158] According to some embodiments of the present invention, referring to Fig.10, the thickness of the second insulating member 302 is h2, wherein h2 satisfies: 20um≤h2≤200um. For example, when the thickness h2 of the second insulating member 302 is greater than 200um, the material used in the second insulating member 302 is more, the cost of the second insulating member 302 is higher, and thus the production cost of the battery cell 300 is higher. When the thickness h2 of the second insulating member 302 is less than 20um, the connection between the second insulating member 302 and the first pole tab 3011 and the second pole tab 3012 is weak, thereby reducing the use stability of the second insulating member 302. Therefore, by setting the thickness h2 of the second insulating member 302 to satisfy 20um≤h2≤200um, the material used in the second insulating member 302 is reduced, thereby reducing the production cost of the second insulating member 302, and further reducing the production cost of the cover plate 100. In addition, the connection stability between the second insulating member 302 and the first pole tab 3011 and the second pole tab 3012 is improved, thereby facilitating the long-term and stable use of the second insulating member 302.

[0159] According to some embodiments of the present invention, referring to Fig. 9 , the pole 2 of the cap plate assembly 200 is opposite to the center of the above-mentioned one end of the pole core 301. Fig. 9 In the example, the lower surface of the pole 2 is vertically opposite to the center position of the upper end of the pole core 301. That is, the pole 2 is located at the center position of the upper end of the pole core 301. Such a configuration is conducive to connecting the pole 2 with the first current collecting plate 3, and the welding track of the first current collecting plate 3 after connection is as close as possible to the center of the pole core 301, so as to reduce the structural impedance and improve the current carrying capacity, thereby improving the performance of the battery cell 300.

[0160] Optionally, the annular connection between the substrate 202 and the cover body 1, and the annular connection between the substrate 202 and the shell 303 are generally similar in "U" shape design, that is, the connection between the substrate 202 and the cover body 1 is annular, and the connection between the substrate 202 and the shell 303 is located at the outer periphery of the connection between the above-mentioned substrate 202 and the cover body 1, which is annular so as to avoid the overlap of welds at the welding points between the substrate 202 and the cover body 1 and the shell 303, resulting in poor welding, and to avoid the inflection point design, resulting in poor inflection point welding.

[0161] According to some optional embodiments of the present invention, referring to Figure 5 and Fig.11, the width of the groove 33 is w1, and the diameter of the pole core 301 is d5, wherein w1 satisfies: 4mm≤w1≤0.4d5. That is, the maximum value of the width of the groove 33 is related to the diameter of the pole core 301, which is 0.4 times the diameter of the pole core 301. For example, when the width w1 of the groove 33 is greater than 0.4d5, the width of the groove 33 is larger, so that the area of ​​other parts of the first current collecting disc 3 is smaller, thereby making the contact area between the first current collecting disc 3 and the first insulating member 203 smaller, and reducing the connection stability between the first current collecting disc 3 and the first insulating member 203. When the width w1 of the groove 33 is less than 4mm, the width of the groove 33 is smaller, thereby making the area of ​​the connecting protrusion 32 smaller, and the connection area between the first current collecting disc 3 and the first pole lug 3011 is reduced, thereby reducing the connection stability between the first current collecting disc 3 and the first pole lug 3011, and improving the structural impedance of the battery cell 300. Therefore, by setting the width w1 of the groove 33 to satisfy 4mm≤w1≤0.4d5, the connection area between the first collecting disk 3 and the first insulating member 203 and the first pole lug 3011 is increased, thereby increasing the connection stability between the first collecting disk 3 and the first insulating member 203 and the first pole lug 3011, and reducing the structural impedance of the battery cell 300, which is beneficial to the use of the battery cell 300.

[0162] Optionally, the pole core 301 is formed by winding, the first pole ear 3011 and the second pole ear 3012 are flattened pole ears or cut and stacked pole ears, and the pole ears are divided into two sides, one side is the first pole ear 3011, the first pole ear 3011 is connected to the first current collecting disk 3, and the other side is the second pole ear 3012, the second pole ear 3012 is connected to the second current collecting disk 201, and the first pole ear 3011 and the second pole ear 3012 are arranged at intervals. Thus, the production of the pole core 301 is facilitated. In addition, the first pole ear 3011 and the second pole ear 3012 can be prevented from overlapping and short-circuiting, so that the battery cell 300 can be used normally for a long time.

[0163] Optionally, refer to Fig.12The central area of ​​the pole core 301 is provided with a central hole 3013, and the central hole 3013 is located between the first pole ear 3011 and the second pole ear 3012. The sides opposite to the first pole ear 3011 and the second pole ear 3012 are tangent to the edge of the central hole 3013. The diameter of the central hole 3013 is d6, wherein d6 satisfies: 2mm≤d6≤10mm. When the diameter d6 of the central hole 3013 is greater than 10mm, the area of ​​the first pole ear 3011 and the second pole ear 3012 is small, thereby reducing the contact area between the first pole ear 3011 and the second pole ear 3012 and the corresponding first current collecting disk 3 and the second current collecting disk 201, which is not conducive to the normal use of the battery cell 300. When the diameter d6 of the central hole 3013 is less than 2mm, the distance between the first pole ear 3011 and the second pole ear 3012 is small, and overlapping short circuit is prone to occur, which is not conducive to the normal use of the battery cell 300. Therefore, by setting the diameter d6 of the center hole 3013 to satisfy 2mm≤d6≤10mm, the contact area between the first pole ear 3011 and the second pole ear 3012 and the corresponding first current collecting disk 3 and the second current collecting disk 201 can be increased, which is beneficial to the normal use of the battery cell 300, and the first pole ear 3011 and the second pole ear 3012 can be prevented from overlapping and short-circuiting, thereby extending the service life of the battery cell 300.

[0164] Optionally, refer to Figure 8 and Fig.11 The battery cell 300 further includes a shell 303 and a separator 304. The shell 303 wraps the pole core 301. The pole core 301 and the separator 304 are both arranged in the shell 303. The separator 304 is located between the pole core 301 and the inner wall of the shell 303. The pole core 301 is separated from the inner wall of the shell 303 by the separator 304. Figure 8 and Fig.11 In the example, the separator 304 is arranged at one end of the shell 303 away from the cover plate 100 in the up-down direction, and the separator 304 is located between the lower end of the pole core 301 and the bottom wall of the shell 303. In this way, the separator 304 separates the pole core 301 from the shell 303, so that the current on the pole core 301 cannot pass through the shell 303, thereby reducing the structural impedance of the battery cell 300. In addition, one end of the pole core 301 adjacent to the separator 304 does not contact the bottom wall of the shell 303, and the separator 304 has a protective effect on the pole core 301, which can prevent the pole core 301 from being directly in contact with the shell 303 and causing the pole core 301 to be damaged, thereby extending the service life of the pole core 301, and then extending the service life of the battery cell 300. In addition, the separator 304 is easy to install and operate, and the separator 304 can be placed in the shell 303, thereby improving the assembly efficiency of the battery cell 300.

[0165] Optionally, refer to Figure 13-Figure 15The housing 303 includes a housing 3030 and a bottom cover 3031. The bottom cover 3031 is connected to the lower end of the housing 3030 to define a space for placing the pole core 301. The bottom cover 3031 is connected to the housing 3030 by welding. A liquid injection hole 303a is provided on the bottom cover 3031. A sealing structure 3032 matching the liquid injection hole 303a is provided at the liquid injection hole 303a. The sealing structure 3032 includes an elastic sealing pad 303b and a sealing cover 303c. The side of the elastic sealing pad 303b away from the pole core 301 is connected to the sealing cover 303c. The sealing cover 303c is welded to the elastic sealing pad 303b and the inner wall of the liquid injection hole 303a. As a result, the connection strength between the bottom cover 3031 and the circumferential side wall of the housing 303 is strengthened, thereby improving the structural strength of the housing 303, which is conducive to the long-term and stable use of the housing 303. In addition, the processing accuracy of the shell body 3030 and the bottom cover plate 3031 is improved, thereby improving the processing accuracy of the outer shell 303. In addition, after the electrolyte is injected into the battery cell 300 through the injection hole 303a, the elastic sealing gasket 303b is used to seal the injection hole 303a, thereby preventing the electrolyte from flowing out, thereby preventing the battery cell 300 from being damaged. The sealing cover 303c further improves the sealing performance between the elastic sealing gasket 303b and the injection hole 303a, thereby further preventing the electrolyte from flowing out, thereby further preventing the battery cell 300 from being damaged.

[0166] Optionally, the material of the first insulating member 203 and the second insulating member 302 can be set to polyethylene terephthalate, which has excellent electrical insulation, and even under high temperature and high frequency conditions, the insulation performance is still good. Therefore, when the battery cell 300 is used for a period of time and heats up, the first insulating member 203 and the second insulating member 302 still have a good insulation effect, thereby preventing the internal components of the battery cell 300 from short-circuiting, which is conducive to the normal use of the battery cell 300.

[0167] A battery (not shown) according to an embodiment of the fourth aspect of the utility model comprises a battery cell 300 according to an embodiment of the third aspect of the utility model.

[0168] According to the battery of the embodiment of the present utility model, by adopting the battery core 300, the assembly efficiency of the battery is improved and the use performance of the battery is improved.

[0169] According to some embodiments of the present invention, referring to Figure 1 , the side edge of the cover plate body 1 of the cover plate assembly 200 of the battery cell 300 is an arc shape adapted to the outer peripheral contour of the battery cell 300. Figure 1In the example, the side of the cover body 1 away from the first current collecting disk 3 along the plane perpendicular to the up and down direction of the first current collecting disk 3 is formed into an arc-shaped edge, and the battery cell 300 is set to a cylindrical shape, and the arc-shaped edge is adapted to the edge shape of the battery cell 300. As a result, the cover body 1 has a simple structure, is easy to produce, and also improves the aesthetics of the cover body 1. In addition, when the cover body 1 is used for the battery cell 300, the arc-shaped edge of the cover body 1 cooperates with the outer peripheral surface of the battery cell 300, which is conducive to the assembly of the cover 100 and other components of the battery cell 300, thereby improving the assembly efficiency of the battery cell 300. In addition, the connection area between the cover body 1 and other components of the battery cell 300, such as the second current collecting disk 201, is increased, thereby improving the use stability of the cover body 1.

[0170] A battery assembly (not shown) according to an embodiment of the fifth aspect of the utility model comprises a battery according to an embodiment of the fourth aspect of the utility model.

[0171] According to the battery assembly of the embodiment of the utility model, by adopting the above-mentioned battery, the assembly efficiency of the battery assembly is improved, and the use performance of the battery assembly is also improved.

[0172] An electrical device (not shown) according to an embodiment of the sixth aspect of the utility model comprises a battery assembly according to an embodiment of the fifth aspect of the utility model.

[0173] According to the electric equipment of the embodiment of the utility model, by adopting the above-mentioned battery assembly, the performance of the electric equipment is improved and the user experience is enhanced. The electric equipment may be a vehicle, an electric two-wheeled vehicle, an electric multi-wheeled vehicle, an energy storage cabinet, an unmanned aerial vehicle, a ship, etc.

[0174] Other structures and operations of the battery cell 300, battery, battery assembly and electrical equipment according to the embodiment of the utility model are well known to those skilled in the art and will not be described in detail here.

[0175] In the description of the present invention, it is necessary to understand that the terms "center", "width", "thickness", "up", "down", "top", "bottom", "inside", "outside", "axial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0176] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0177] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A cover plate, characterized in that: include: Cover plate body; A pole, the pole is arranged on the cover body, and the pole is insulated and connected to the cover body; A first current collecting disk, the first current collecting disk is connected to the pole, the first current collecting disk includes a main body, the main body is suitable for connecting with the pole ear, along the thickness direction of the first current collecting disk, the main body is exposed from the cover body, the shortest distance between the main body and the center of the pole is d0, wherein d0 satisfies: 2mm≤d0≤8mm.

2. The cover plate according to claim 1, characterized in that: The d0 further satisfies: 4mm≤d0≤8mm.

3. The cover plate according to claim 1, characterized in that: The pole is passed through the cover body, a first insulating spacer and a sealing member are provided between the outer circumference of the pole and the cover body, the sealing member is sleeved on the pole, and the first insulating spacer is provided on the sealing member and the outer circumference of the pole.

4. The cover plate according to claim 3, characterized in that: Further including: A connecting member connected to an end of the pole away from the first current collecting disk along the thickness direction of the first current collecting disk; A second insulating spacer is provided between the connecting member and the cover body.

5. The cover plate according to claim 4, characterized in that: A second insulating spacer groove is formed on the second insulating spacer, the connecting member is fitted in the second insulating spacer groove, and the connecting member is insulated from the cover plate body by the second insulating spacer.

6. The cover plate according to claim 4, characterized in that: The pole includes a first pole segment and a second pole segment connected to each other, the first pole segment passes through the cover body and the second insulating separator and is connected to the connector, the second pole segment is located on a side of the cover body facing the first current collecting disk, and the second pole segment is connected to the first current collecting disk.

7. The cover plate according to claim 6, characterized in that: A cover plate through-hole is formed on the cover plate body, the first pole segment passes through the cover plate through-hole, at least a portion of the seal is arranged between the outer peripheral surface of the first pole segment and the inner peripheral wall of the cover plate through-hole, and the first insulating separator is arranged on the outer peripheral side of the seal and the second pole segment.

8. The cover plate according to claim 7, characterized in that: The sealing element comprises: A first sealing section, the first sealing section is provided between the outer peripheral surface of the pole and the inner peripheral wall of the cover plate perforation; A second sealing section, wherein the second sealing section is connected to an end of the first sealing section adjacent to the first current collecting disk, and the second sealing section is located between the first insulating spacer and the first pole section.

9. The cover plate according to claim 6, characterized in that: A rotation-stop groove is formed on a surface of one side of the first insulating partition adjacent to the first current collecting plate, and the second pole segment is fitted in the rotation-stop groove; An extension portion is provided on the first current collecting plate, at least a portion of the outer periphery of the extension portion is fitted in the anti-rotation groove, and the extension portion is connected to a side of the second pole segment away from the cover plate body.

10. The cover plate according to claim 9, characterized in that: At least a portion of the outer peripheral edge of the extension portion is adapted to the shape of the inner peripheral wall of the anti-rotation groove.

11. The cover plate according to claim 9, characterized in that: A stop protrusion is provided on a side surface of the first insulating separator adjacent to the first current collecting disk, and the stop protrusion and the side surface of the first insulating separator adjacent to the first current collecting disk together define the stop groove, and the side of the stop groove adjacent to the center of the first current collecting disk is open.

12. The cover plate according to claim 3, characterized in that: The thickness of the first insulating spacer is d1, wherein d1 satisfies: 0.5 mm≤d1≤2.0 mm.

13. The cover plate according to claim 3, characterized in that: The first insulating spacer is an injection molded part.

14. The cover plate according to claim 6, characterized in that: A cover plate protrusion is provided on a surface of one side of the cover plate body adjacent to the first insulating spacer along the thickness direction of the cover plate body; A first insulating spacer groove is formed on a side surface of the first insulating spacer adjacent to the cover body along the thickness direction of the cover body, a first insulating spacer through-hole is formed on the bottom wall of the first insulating spacer groove, the first pole segment passes through the first insulating spacer through-hole, and the cover protrusion fits in the first insulating spacer groove.

15. The cover plate according to claim 14, characterized in that: The cover plate protrusion is formed by a portion of a side surface of the cover plate body away from the first current collecting plate along a thickness direction of the cover plate body protruding toward a side surface of the first current collecting plate.

16. The cover plate according to claim 15, characterized in that: The cover plate protrusion forms a cover plate groove on a surface of the cover plate body at one side away from the first collecting plate along the thickness direction of the cover plate body, and at least a portion of the second insulating spacer is fitted in the cover plate groove.

17. The cover plate according to claim 4, characterized in that: The connecting piece is polygonal or oblong.

18. The cover plate according to claim 4, characterized in that: The width of the connecting piece is w, and the diameter of the pole is d2, wherein w and d2 satisfy: 3.5mm≤w-d2≤6mm.

19. The cover plate according to claim 4, characterized in that: The connecting piece is an aluminum stamping piece.

20. The cover plate according to claim 1, characterized in that The cover plate body is a steel stamping part.

21. The cover plate according to any one of claims 1 to 20, characterized in that: The first current collecting plate is provided with a connecting protrusion which protrudes away from the cover plate body along the thickness direction of the first current collecting plate.

22. The cover plate according to claim 21, characterized in that The connecting protrusion includes a first protrusion portion and a second protrusion portion, one end of the first protrusion portion is connected to one end of the second protrusion portion, the other end of the first protrusion portion and the other end of the second protrusion portion extend in a direction away from each other, and the angle between the first protrusion portion and the second protrusion portion is β, wherein β satisfies: 20°≤β≤80°.

23. The cover plate according to claim 21, characterized in that The connecting protrusion is formed by a portion of a side surface of the first current collecting disk adjacent to the pole along the thickness direction of the first current collecting disk protruding toward a side surface away from the pole, and the connecting protrusion forms a groove on the side surface of the first current collecting disk adjacent to the pole along the thickness direction of the first current collecting disk to form the connecting protrusion on the side surface away from the pole.

24. A cover plate assembly, characterized in that: include: A cover plate, wherein the cover plate is a cover plate according to any one of claims 1 to 23; The second current collecting disk is connected to the cover plate body of the cover plate, the second current collecting disk is insulated from the pole of the cover plate and the first current collecting disk, and the second current collecting disk and the first current collecting disk are respectively connected to pole ears with opposite polarities.

25. The cover plate assembly according to claim 24, characterized in that Further including: A substrate is connected to a side of the cover plate away from the second current collecting plate along a thickness direction of the cover plate, an opening is formed on the substrate, and the pole is exposed from the opening.

26. The cover plate assembly according to claim 25, characterized in that The outer periphery of the cover plate has a step portion, and the edge of the opening has a matching portion extending toward the center of the opening, and the matching portion is matched on the step portion.

27. The cover plate assembly according to claim 25, characterized in that On the side where the second current collecting plate is located, the minimum distance between the edge of the opening and the outer periphery of the substrate is d4, wherein d4 satisfies: 1.5 mm≤d4≤4 mm.

28. The cover plate assembly according to any one of claims 25 to 27, characterized in that: Further including: A first insulating member is provided between the substrate and the first current collecting plate.

29. The cover plate assembly according to claim 28, characterized in that The thickness of the first insulating member is h1, wherein h1 satisfies: 20um≤h1≤200um.

30. A battery cell, characterized in that: include: A pole core, wherein a first pole ear and a second pole ear are provided at one end of the pole core, and the first pole ear and the second pole ear have opposite polarities; A cover plate assembly, wherein the cover plate assembly is a cover plate assembly according to any one of claims 24-29, wherein the cover plate assembly is arranged at one end of the pole core, wherein the first current collecting disk of the cover plate assembly is connected to the first pole ear, and the second current collecting disk of the cover plate assembly is connected to the second pole ear.

31. The battery cell according to claim 30, characterized in that: Further including: A second insulating member is provided between the first pole tab and the second pole tab.

32. The battery cell according to claim 31, characterized in that: The thickness of the second insulating member is h2, wherein h2 satisfies: 20um≤h2≤200um.

33. The battery cell according to claim 30, characterized in that: The pole of the cap plate assembly is opposite to the center of the one end of the pole core.

34. A battery, characterized in that: Comprising a battery cell according to any one of claims 30-33.

35. The battery according to claim 34, characterized in that The side edge of the cover plate body of the cover plate of the cover plate assembly of the battery cell is an arc shape adapted to the outer peripheral contour of the battery cell.

36. A battery assembly, characterized in that: Comprising a battery according to claim 34 or 35.

37. An electrical equipment, characterized in that: Comprising a battery assembly according to claim 36.

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