Cover plate assembly, battery monomer and battery pack

Abstract

The utility model provides a cover plate assembly, a battery cell and a battery pack, and relates to the technical field of batteries. The cover plate assembly comprises a cover plate, a pole and a first insulating part; the pole comprises a columnar part penetrating through the cover plate and an end cap part connected to one end of the columnar part; the end cap part is provided with an annular part which protrudes outwards in the radial direction of the columnar part, the annular part is provided with a first surface close to the columnar part, and the first surface comprises a first area and a second area which have a height difference; the first insulating part is located between the cover plate and the end cap part and abuts against the first area and the second area. By setting the height difference, the extrusion force of one of the first region and the second region, which is closer to the first insulating part, on the first insulating part is larger. Therefore, the extrusion force of the end cap part on the first insulating part can be locally increased, so that the sealing performance between the end cap part and the first insulating part can be improved on the basis of controlling the material consumption of the pole, and the sealing performance of the matching part between the pole and the cover plate is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a cover plate assembly, a battery monomer and a battery pack. BACKGROUND

[0002] In the related art, a battery monomer includes a shell, an electrode assembly arranged in the shell, and a cover plate assembly for closing an opening of the shell. The cover plate assembly includes a cover plate, a pole arranged on the cover plate, a first insulating piece (also referred to as an upper plastic piece) for insulating and separating the end of the pole from the cover plate, and a sealing ring for sealingly engaging the pole and the cover plate. In the cover plate assembly, there is no other sealing structure except for the sealing ring to ensure the sealing of the inside of the battery monomer. As such, the sealing of the engagement part between the pole and the cover plate is poor. CONTENT OF THE UTILITY MODEL

[0003] Embodiments of the present application provide a cover plate assembly, a battery monomer and a battery pack, which can improve the sealing of the engagement part between the pole and the cover plate.

[0004] In a first aspect, embodiments of the present application provide a cover plate assembly, which includes a cover plate, a pole and a first insulating piece. The pole includes a columnar portion and an end cap portion; the columnar portion is arranged on the cover plate; the end cap portion is connected to one end of the columnar portion and located on one side of the cover plate; the end cap portion has an annular portion protruding outward in the radial direction of the columnar portion, and the annular portion has a first surface; in the radial direction outward of the columnar portion, the first surface includes a first region and a second region; there is a height difference between the first region and the second region; the first insulating piece is located between the cover plate and the end cap portion and abuts against the first region and the second region.

[0005] In an embodiment, in the axial direction of the columnar portion, the first region protrudes relative to the second region to form a height difference, and the height dimension of the outward protrusion of the first region is Ha1, and the thickness dimension of the end cap portion is Da, satisfying 0 < Ha1 ≤ 15% Da.

[0006] In an embodiment, 2% Da≤Ha1≤15% Da.

[0007] In an embodiment, in the axial direction of the columnar portion, the second region protrudes relative to the first region to form a height difference, and the height dimension of the outward protrusion of the second region is Ha2, and the thickness dimension of the end cap portion is Da, satisfying 0 < Ha2 ≤ 15% Da.

[0008] In an embodiment, 2% Da≤Ha2≤15% Da.

[0009] In an embodiment, the first region is convex relative to the second region along the axial direction of the columnar portion to form a first convex portion, the first convex portion extending annularly along the circumferential direction of the end cap portion; or, the second region is convex relative to the first region along the axial direction of the columnar portion to form a second convex portion, the second convex portion extending annularly along the circumferential direction of the end cap portion.

[0010] In an embodiment, the pole includes a first metal column and a second metal layer; the first metal column includes a first segment and a second segment connected to each other; the second metal layer includes a barrel and a flange connected to each other, the barrel covering the first segment, and the flange extending along the radial direction of the pole and embedded into an end surface of the second segment facing the first segment; wherein the first segment and the barrel constitute a columnar portion, and the second segment and the flange constitute an end cap portion; a part of the end surface of the second segment facing the first segment is a first region, and another part cooperates with the flange, and a surface of the flange away from the first segment is a second region.

[0011] In an embodiment, the end surface of the second segment facing the first segment is provided with a fitting groove, and the flange is fitted with the fitting groove; the flange and the fitting groove have a gap a therebetween.

[0012] In an embodiment, the gap a is located between an end of the flange away from the axis of the pole and a groove wall of the fitting groove.

[0013] In an embodiment, the thickness dimension of the end cap portion is Da; wherein the dimension of the gap a in the radial direction of the pole is La, and 0 < La ≤ 10% Da is satisfied; and / or, the dimension of the gap a in the axial direction of the pole is Ha3, and 0 < Ha3 ≤ 40% Da is satisfied.

[0014] In an embodiment, the first region is convex outwardly from the first surface along the axial direction of the columnar portion; wherein a limiting groove is arranged on the side of the first insulating member away from the cover plate, an end of the end cap portion close to the columnar portion is located in the limiting groove, and an exhaust groove is arranged on the inner wall of the limiting groove, one end of the exhaust groove extends to the inner circumferential surface of the first insulating member, and the other end extends to the surface of the first insulating member away from the cover plate; or, an exhaust groove is arranged on the side of the first insulating member away from the cover plate, and two ends of the exhaust groove extend to the inner circumferential surface and the outer circumferential surface of the first insulating member respectively.

[0015] In a second aspect, an embodiment of the present application provides a battery monomer, which includes a shell, an electrode assembly, and the aforementioned cover plate assembly; the electrode assembly is arranged in the shell; and the cover plate is sealingly connected with the shell.

[0016] In a third aspect, an embodiment of the present application provides a battery pack, which includes the aforementioned battery monomer, and a plurality of battery monomers are electrically connected.

[0017] The beneficial effects of the embodiments of the present application are as follows:

[0018] In the embodiments of the present application, a height difference is formed between the first region and the second region on the end cap portion, so that one of the two regions closer to the first insulating piece has a greater extrusion force on the first insulating piece. In this way, the extrusion force of the end cap portion on the first insulating piece can be locally increased, so that the sealing between the end cap portion and the first insulating piece can be improved on the basis of controlling the amount of material of the pole column, to improve the sealing of the fitting part between the pole column and the cover plate. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort.

[0020] Figure 1 is a structural schematic diagram of a first pole column provided by an embodiment of the present application;

[0021] Figure 2 is a structural schematic diagram of a second pole column provided by an embodiment of the present application;

[0022] Figure 3 is a structural schematic diagram of a third pole column provided by an embodiment of the present application;

[0023] Figure 4 is an enlarged view of A in Figure 3

[0024] Figure 5 is a structural schematic diagram of a fourth pole column provided by an embodiment of the present application;

[0025] Figure 6 is an enlarged view of B in Figure 5

[0026] Figure 7 is a structural schematic diagram of a first cover plate assembly provided by an embodiment of the present application;

[0027] Figure 8 is a structural schematic diagram of a second cover plate assembly provided by an embodiment of the present application;

[0028] Figure 9 is a structural schematic diagram of a third cover plate assembly provided by an embodiment of the present application;

[0029] Figure 10 is a structural schematic diagram of a first insulating piece provided by an embodiment of the present application;

[0030] Figure 11 is a structural schematic diagram of a battery monomer provided by an embodiment of the present application. ​​

[0031] Reference Signs List:

[0032] 101-pole; 1011-column part; 1012-end cap part; 1013-first surface; 1014-annular part; 1015-first region; 1016-second region; 1017-first convex part; 1018-second convex part; 1019-bottom plate;

[0033] 1-first metal pole; 14-first section; 15-second section; 16-embedded groove; 2-second metal layer; 27-cylinder; 28-flange; 29-gap a;

[0034] 100-cover plate assembly; 110-cover plate; 112-first insulating piece; 1121-exhaust slot; 1122-limiting slot; 113-second insulating piece; 120-current collecting piece; 130-sealing piece;

[0035] 1000-battery cell; 1100-housing. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0037] In addition, it should be understood that the specific embodiments described herein are merely intended to illustrate and explain the present application, and are not intended to limit the present application. In the present application, unless otherwise stated, the orientation words such as "upper" and "lower" generally refer to the upper and lower of the device in the actual use or working state, and the specific direction of the drawing surface in the drawings; and "inner" and "outer" refer to the contour of the device.

[0038] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0039] The terms "comprise", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a product or process that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such product or process.

[0040] In the description of the embodiments of the present application, the word "example" or "for example" is used to mean serving as an example, instance, or illustration. Any embodiment or design scheme described as "example" or "for example" in the embodiments of the present application is not to be construed as preferable or having more advantages than other embodiments or design schemes. The word "example" or "for example" is used to present relative concepts in a clear manner.

[0041] Please refer to Figure 7 or Figure 8 or Figure 9 , Figure 7 is a structural schematic diagram of a first cover plate assembly 100 provided by an embodiment of the present application, Figure 8 is a structural schematic diagram of a second cover plate assembly 100 provided by an embodiment of the present application, Figure 9 is a structural schematic diagram of a third cover plate assembly 100 provided by an embodiment of the present application. An embodiment of the present application provides a cover plate assembly 100. The cover plate assembly 100 comprises a cover plate 110, a pole 101, and a first insulating piece 112. The pole 101 comprises a columnar portion 1011 and an end cap portion 1012. The columnar portion 1011 is arranged through the cover plate 110. The end cap portion 1012 is connected to one end of the columnar portion 1011 and located on one side of the cover plate 110. The end cap portion 1012 has an annular portion 1014 protruding outward in the radial direction of the columnar portion 1011, and the annular portion 1014 has a first surface 1013 close to the columnar portion 1011. In the direction outward in the radial direction of the columnar portion 1011, the first surface 1013 comprises a first area 1015 and a second area 1016. There is a height difference between the first area 1015 and the second area 1016, as shown in Figure 1 or Figure 2 as shown, Figure 1 is a structural schematic diagram of a first pole 101 provided by an embodiment of the present application, Figure 2 is a structural schematic diagram of a second pole 101 provided by an embodiment of the present application. The first insulating piece 112 is located between the cover plate 110 and the end cap portion 1012 and abuts against the first area 1015 and the second area 1016.

[0042] It can be understood that the outer diameter of the annular portion 1014 is greater than the outer diameter of the columnar portion 1011, so that the annular portion 1014 has the first surface 1013 close to the columnar portion 1011.

[0043] It can be understood that one of the first region 1015 and the second region 1016 is outwardly convex along the axial direction of the pole post 101 to form a height difference.

[0044] Exemplarily, along the axial direction of the columnar portion 1011, the first region 1015 is outwardly convex from the first surface 1013. Alternatively, along the axial direction of the columnar portion 1011, the second region 1016 is outwardly convex from the first surface 1013.

[0045] It can be understood that the cross section of the end cap portion 1012 can be cylindrical, polygonal or irregular.

[0046] It can be understood that the first surface 1013 abuts against the first insulating member 112, so that the first insulating member 112 is axially pressed to realize the sealing of the fitting surface between the end cap portion 1012 and the first insulating member 112. The height difference between the first region 1015 and the second region 1016 is configured to make the one closer to the first insulating member 112 to have a greater extrusion force on the first insulating member 112, so as to seal the fitting part between the pole post 101 and the first insulating member 112.

[0047] In the embodiment, the height difference between the first region 1015 and the second region 1016 on the end cap portion 1012 is configured to make the one closer to the first insulating member 112 to have a greater extrusion force on the first insulating member 112. In this way, the extrusion force of the end cap portion 1012 on the first insulating member 112 can be locally increased, so that the sealing between the end cap portion 1012 and the first insulating member 112 can be improved on the basis of controlling the material amount of the pole post 101, to improve the sealing of the fitting part between the pole post 101 and the cover plate 110. In this way, the reliability of the battery monomer 1000 can be improved.

[0048] In addition, when the first region 1015 is outwardly convex from the first surface 1013, the sealing of the outer periphery of the press-fitting surface between the end cap portion 1012 and the first insulating member 112 can be improved, so that the external debris and impurities can be effectively prevented from entering between the end cap portion 1012 and the first insulating member 112, to facilitate the stability of the sealing structure between the end cap portion 1012 and the first insulating member 112.

[0049] Meanwhile, when the second region 1016 is outwardly convex from the first surface 1013, the inner periphery side of the first insulating member 112 can be pressed more greatly, so that the deformation amount of the inner periphery side of the first insulating member 112 can be increased, to make the periphery of the first insulating member 112 be buckled towards the end cap portion 1012, to facilitate the sealing between the end cap portion 1012 and the first insulating member 112 at the periphery.

[0050] Please refer to Figure 1In an embodiment, the first region 1015 is convex relative to the second region 1016 along the axial direction of the columnar portion 1011 to form a height difference, and a height dimension of the convex first region 1015 is Ha1, and a thickness dimension of the end cap portion 1012 is Da, and 0 < Ha1 ≤ 15% Da is satisfied.

[0051] It can be understood that the height dimension Ha1 of the convex first region 1015 includes but is not limited to 1% Da, 2% Da, 3% Da, 4% Da, 5% Da, 6% Da, 7% Da, 8% Da, 9% Da, 10% Da, 11% Da, 12% Da, 13% Da, 14% Da, and 15% Da.

[0052] Exemplarily, the thickness dimension Da of the end cap portion 1012 is 2 mm, and Ha1 = 10% Da = 0.2 mm.

[0053] In the embodiment, by the above definition, on the one hand, the amount of material of the convex first region 1015 can be controlled to facilitate the control of the weight of the pole 101; on the other hand, the height dimension Ha1 of the convex first region 1015 can be prevented from being too large to cause the pole 101 and the first insulating member 112 to have a large difficulty in cooperation and a complex size chain.

[0054] In an embodiment, 2% Da ≤ Ha1 ≤ 15% Da. In this way, the pressure connection of the first region 1015 to the first insulating member 112 can be more obvious, so as to facilitate the convex first region 1015 to have a more obvious effect on the improvement of the sealing between the end cap portion 1012 and the first insulating member 112.

[0055] In an embodiment, the second region 1016 is convex relative to the first region 1015 along the axial direction of the columnar portion 1011 to form a height difference, and a height dimension of the convex second region 1016 is Ha2, and a thickness dimension of the end cap portion 1012 is Da, and 0 < Ha2 ≤ 15% Da is satisfied.

[0056] It can be understood that the height dimension Ha2 of the convex second region 1016 includes but is not limited to 1% Da, 2% Da, 3% Da, 4% Da, 5% Da, 6% Da, 7% Da, 8% Da, 9% Da, 10% Da, 11% Da, 12% Da, 13% Da, 14% Da, and 15% Da.

[0057] Exemplarily, the thickness dimension Da of the end cap portion 1012 is 2 mm, and Ha2 = 10% Da = 0.2 mm.

[0058] In the embodiment, by the above definition, on one hand, the amount of material of the second region 1016 can be controlled to facilitate the control of the weight of the pole 101; on the other hand, the height dimension Ha2 of the second region 1016 can be prevented from being too large to cause the pole 101 and the first insulating member 112 to have a large difficulty in cooperation and a complex dimension chain.

[0059] In an embodiment, 2%Da≤Ha2≤15%Da. In this way, the crimping of the second region 1016 to the first insulating member 112 can be more obvious, so as to facilitate the second region 1016 to have a more obvious effect on the improvement of the sealing between the end cap portion 1012 and the first insulating member 112.

[0060] In an embodiment, along the axial direction of the columnar portion 1011, the first region 1015 is protruded relative to the second region 1016 to form a first protruding portion 1017, and the first protruding portion 1017 extends in a ring shape along the circumferential direction of the end cap portion 1012.

[0061] Alternatively, along the axial direction of the columnar portion 1011, the second region 1016 is protruded relative to the first region 1015 to form a second protruding portion 1018, and the second protruding portion 1018 extends in a ring shape along the circumferential direction of the end cap portion 1012.

[0062] In the embodiment, when the first region 1015 is protruded outward from the first surface 1013 to form the first protruding portion 1017, by making the first protruding portion 1017 extend in a ring shape along the circumferential direction of the end cap portion 1012, the stress uniformity of the end cap portion 1012 and the first insulating member 112 can be improved, so as to facilitate the improvement of the stress state of the battery monomer 1000 and avoid stress concentration.

[0063] In addition, when the second region 1016 is protruded outward from the first surface 1013 to form the second protruding portion 1018, by making the second protruding portion 1018 extend in a ring shape along the circumferential direction of the end cap portion 1012, the stress uniformity of the end cap portion 1012 and the first insulating member 112 can be improved, so as to facilitate the improvement of the stress state of the battery monomer 1000 and avoid stress concentration.

[0064] Please refer to Figure 3 and Figure 4 , or Figure 5 and Figure 6 , Figure 3 is a third structure schematic view of a pole 101 provided by an embodiment of the present application; Figure 4 is Figure 3 is an enlarged view of A in Figure 5 is a fourth structure schematic view of a pole 101 provided by an embodiment of the present application; Figure 6 is Figure 5An enlarged view of the middle B. In an embodiment, the pole 101 comprises a first metal column 1 and a second metal layer 2. The first metal column 1 comprises a first segment 14 and a second segment 15 connected with each other. The second metal layer 2 comprises a barrel 27 and a flange 28 connected with each other. The barrel 27 covers the first segment 14. The flange 28 extends along the radial direction of the pole 101 and is embedded into the end face of the second segment 15 towards the first segment 14. The first segment 14 and the barrel 27 constitute a columnar part 1011. The second segment 15 and the flange 28 constitute an end cap part 1012. A part of the end face of the second segment 15 towards the first segment 14 is a first area 1015, and the other part cooperates with the flange 28. The surface of the flange 28 away from the first segment 14 is a second area 1016.

[0065] It can be understood that the current collector of the negative plate is copper material. In order to reduce the cost and weight of the battery monomer 1000 and improve the current-carrying capacity between the negative pole 101 and the negative plate, the part of the negative pole 101 located outside the battery monomer 1000 is made of aluminum material, and the part of the negative pole 101 located inside the battery monomer 1000 is made of copper material. Therefore, different materials are selected to form different parts of the pole 101 to form a composite pole 101. In this way, on the basis of realizing the connection between the negative plate and the external circuit, the weight of the pole 101 can be reduced, and the current-carrying capacity between the pole 101 and the negative plate can be ensured.

[0066] It can be understood that the material of the first metal column 1 is different from the material of the second metal layer 2.

[0067] Optionally, the material of the first metal column 1 is aluminum material, and the material of the second metal layer 2 is copper material.

[0068] In addition, the composite pole 101 is formed by extruding aluminum material and copper material. In this way, when the first metal and the second metal are extruded and combined, one of the first area 1015 and the second area 1016 can be formed to protrude outward, so as to facilitate improving the forming efficiency of the pole 101 and reducing the forming cost.

[0069] Please refer to Figure 5 Or Figure 6 In an embodiment, the end face of the second segment 15 towards the first segment 14 is provided with a fitting groove 16, and the flange 28 is fitted with the fitting groove 16. The flange 28 and the fitting groove 16 have a gap a29 therebetween. The gap a29 is located between the end of the flange 28 away from the axis of the pole 101 and the groove wall of the fitting groove 16. This gap a29 can compensate for the influence of the thermal expansion of the first metal column 1 and the second metal layer 2 on each other during the welding heat receiving process, so as to facilitate improving the stress state of the first metal column 1 and the second metal layer 2.

[0070] Specifically, the size of the gap a29 in the radial direction of the pole post 101 gradually decreases along the axial direction of the pole post 101 and along the direction close to the axis of the pole post 101, so that stress concentration at the bonding site between the first metal post 1 and the second metal layer 2 can be avoided, and thus the stress state of the pole post 101 can be improved.

[0071] In addition, the side of the slot wall of the embedding slot 16 away from the axis of the pole post 101 is smoothly transitioned to the end face of the first section 14 toward the second section 15. The surface of the flange 28 away from the axis of the pole post 101 is smoothly transitioned to the surface of the flange 28 away from the first section 14.

[0072] Please refer to Figure 5 Or Figure 6 In an embodiment, the thickness dimension of the end cap portion 1012 is Da. The size of the gap a29 in the radial direction of the pole post 101 is La, and 0 < La ≤ 10% Da is satisfied; and / or the size of the gap a29 in the axial direction of the pole post 101 is Ha3, and 0 < Ha3 ≤ 40% Da is satisfied.

[0073] Specifically, the size of the gap a29 in the radial direction of the pole post 101 is La, and 0 < La ≤ 10% Da is satisfied, or the size of the gap a29 in the axial direction of the pole post 101 is Ha3, and 0 < Ha3 ≤ 40% Da is satisfied, or the size of the gap a29 in the radial direction of the pole post 101 is La, and 0 < La ≤ 10% Da is satisfied, and the size of the gap a29 in the axial direction of the pole post 101 is Ha3, and 0 < Ha3 ≤ 40% Da is satisfied.

[0074] It can be understood that the size La of the gap a29 in the radial direction of the pole post 101 includes but is not limited to 1% Da, 2% Da, 3% Da, 4% Da, 5% Da, 6% Da, 7% Da, 8% Da, 9% Da, 10% Da.

[0075] It can be understood that the size Ha3 of the gap a29 in the axial direction of the pole post 101 includes but is not limited to 3% Da, 6% Da, 9% Da, 12% Da, 15% Da, 18% Da, 21% Da, 24% Da, 27% Da, 30% Da, 33% Da, 36% Da, 39% Da, 40% Da.

[0076] In the embodiment, by limiting the size La of the gap a29 in the radial direction of the pole post 101, the gap is prevented from being too wide to reduce the bonding between the first metal post 1 and the second metal layer 2, so that the structural reliability of the pole post 101 can be ensured.

[0077] In the embodiment, by limiting the size Ha3 of the gap a29 in the axial direction of the pole 101, the gap can be prevented from being too high to reduce the bonding between the first metal layer 1 and the second metal layer 2, thereby facilitating to ensure the structural reliability of the pole 101.

[0078] Please refer to Figure 10 , Figure 10 is a structural schematic view of the first insulating member 112 provided in the embodiment. In an embodiment, along the axial direction of the columnar portion 1011, the first region 1015 is outwardly protruded from the first surface 1013. The first insulating member 112 is provided with a limiting groove 1122 on the side away from the cover plate 110. The end cap portion 1012 is located in the limiting groove 1122 near one end of the columnar portion 1011. The inner wall of the limiting groove 1122 is provided with an exhaust groove 1121. One end of the exhaust groove 1121 extends to the inner circumferential surface of the first insulating member 112, and the other end extends to the surface of the first insulating member 112 away from the cover plate 110. In this way, the flow of gas between the first insulating member 112 and the second region 1016 can be improved, thereby facilitating to improve the exhaust effect.

[0079] In addition, the cross section of the end cap portion 1012 is non-circular, and at least part of the end cap portion 1012 is located in the limiting groove 1122 and abuts with the inner wall of the limiting groove 1122. In this way, the first insulating member 112 and the end cap portion 1012 can be blocked in the circumferential direction, thereby avoiding the end cap portion 1012 from being twisted, and facilitating to improve the torsional strength of the cover plate assembly 100.

[0080] Exemplarily, the cross section of the end cap portion 1012 is rectangular, and chamfered bevels are provided on four corners.

[0081] In another embodiment, the first insulating member 112 is provided with an exhaust groove 1121 on the side away from the cover plate 110. The two ends of the exhaust groove 1121 extend to the inner circumferential surface and the outer circumferential surface of the first insulating member 112, respectively. In this way, the flow of gas between the first insulating member 112 and the second region 1016 can be improved, thereby facilitating to improve the exhaust effect.

[0082] It can be understood that the cover plate assembly 100 can further include a second insulating member 113, a bottom plate 1019, a sealing member 130, and a current collecting member 120. The second insulating member 113 is a lower plastic member located on the side of the cover plate 110 away from the end cap portion 1012. The bottom plate 1019 is fixed at one end of the columnar portion 1011 away from the end cap portion 1012 and overlaps with the second insulating member 113. The sealing member 130 can be arranged between the bottom plate 1019 and the cover plate 110, or between the end cap portion 1012 and the cover plate 110. The present embodiment does not limit this, and the selection can be made according to the actual application scenario.

[0083] In addition, when the cover plate assembly 100 is applied to the square battery monomer 1000, the current collector 120 is a connecting sheet, as shown in Figure 7 and Figure 8 When the cover plate assembly 100 is applied to the cylindrical battery monomer 1000, the current collector 120 is a current collecting disc, as shown in Figure 9

[0084] Specifically, a matching hole can be arranged on the end face of the columnar part 1011 away from the end cap part 1012, and the current collector 120 protrudes a protruding structure into the matching hole, as shown in Figure 8 In this way, the matching hole and the protruding structure can increase the matching area between the current collector 120 and the pole 101, so as to improve the overcurrent capacity, and can also improve the positioning of the current collector 120 on the pole 101 through the matching hole and the protruding structure, so as to improve the assembly efficiency.

[0085] Please refer to Figure 11 , Figure 11 is a structural schematic diagram of a battery monomer 1000 provided by an embodiment of the present application. The embodiment of the present application provides a battery monomer 1000, which includes a shell 1100, an electrode assembly, and the aforementioned cover plate assembly 100. The electrode assembly is arranged in the shell 1100. The cover plate 110 is sealingly connected with the shell 1100.

[0086] It can be understood that the electrode assembly includes at least a positive electrode sheet, a diaphragm, and a negative electrode sheet arranged in sequence. The positive electrode sheet can be connected with the positive pole 101 through a positive electrode lug, and the negative electrode lug can be connected with the negative pole 101 through the negative electrode sheet.

[0087] The battery monomer 1000 can be a cylindrical battery monomer 1000, a square battery monomer 1000, a soft package battery monomer 1000, a blade battery monomer 1000, etc.

[0088] In the embodiment, by adopting the cover plate assembly 100 provided by some embodiments of the present application, the extrusion force of the end cap part 1012 on the first insulating part 112 can be locally increased, so that the sealing property between the end cap part 1012 and the first insulating part 112 can be improved on the basis of controlling the material amount of the pole 101, so as to improve the reliability of the battery monomer 1000.

[0089] Correspondingly, the embodiment of the present application also provides a battery pack, which includes the aforementioned battery monomer 1000. There are a plurality of battery monomers 1000. The plurality of battery monomers 1000 are electrically connected.

[0090] ​In the embodiment, by adopting the battery monomer 1000 provided by some embodiments of the application, the extrusion force of the end cap portion 1012 on the first insulating member 112 can be locally increased, so that the sealing between the end cap portion 1012 and the first insulating member 112 can be improved on the basis of controlling the material amount of the pole 101, thereby facilitating the improvement of the reliability of the battery pack.

[0091] The above describes the embodiments of the application in detail, and the principles and implementation manners of the application are described by applying specific examples; the above embodiment descriptions are only used to help understand the method of the application and the core idea thereof; meanwhile, for those skilled in the art, the specific implementation manners and application ranges can be changed according to the idea of the application; and in summary, the content of the specification should not be understood as a limitation on the application.

Claims

1. A cover plate assembly, characterized in that, include: Cover plate; An electrode post includes a columnar portion and an end cap portion, the columnar portion passing through the cover plate; the end cap portion is connected to one end of the columnar portion and located on one side of the cover plate; the end cap portion has an annular portion protruding radially outward along the columnar portion, the annular portion having a first surface near the columnar portion, the first surface including a second region and a first region in a radially outward direction along the columnar portion; a height difference exists between the first region and the second region; And a first insulating element, located between the cover plate and the end cap, and abutting against the first region and the second region.

2. The cover plate assembly according to claim 1, characterized in that, Along the axial direction of the columnar portion, the first region protrudes relative to the second region to form the height difference, and the outward protrusion height of the first region is Ha1, and the thickness of the end cap is Da, satisfying 0 < Ha1 ≤ 15% Da.

3. The cover plate assembly according to claim 2, characterized in that, 2%Da≤Ha1≤15%Da.

4. The cover plate assembly according to claim 1, characterized in that, Along the axial direction of the columnar portion, the second region protrudes relative to the first region to form the height difference, and the outward protrusion height of the second region is Ha2, and the thickness of the end cap is Da, satisfying 0 < Ha2 ≤ 15% Da.

5. The cover plate assembly according to claim 4, characterized in that, 2%Da≤Ha2≤15%Da.

6. The cover plate assembly according to any one of claims 1-5, characterized in that, Along the axial direction of the columnar portion, the first region protrudes relative to the second region to form a first protrusion, and the first protrusion extends in a ring shape along the circumferential direction of the end cap portion; or, Along the axial direction of the columnar portion, the second region protrudes relative to the first region to form a second protrusion, and the second protrusion extends in a ring shape along the circumference of the end cap portion.

7. The cover plate assembly according to any one of claims 1-5, characterized in that, The pole includes: The first metal column includes a first segment and a second segment connected together; The second metal layer includes a connected cylindrical body and a flange, the cylindrical body covering the first section, and the flange extending radially along the pole post and embedded in the end face of the second section facing the first section; The first segment and the cylindrical body constitute the columnar portion, and the second segment and the flange constitute the end cap portion; a portion of the end face of the second segment facing the first segment is the first region, and the other portion cooperates with the flange, the surface of the flange facing away from the first segment is the second region.

8. The cover plate assembly according to claim 7, characterized in that, The second segment has a fitting groove on its end face facing the first segment, and the flange fits into the fitting groove; there is a gap a between the flange and the fitting groove.

9. The cover plate assembly according to claim 8, characterized in that, The gap a is located between the end of the flange away from the axis of the pole and the groove wall of the fitting groove.

10. The cover plate assembly according to claim 9, characterized in that, The thickness of the end cap is Da; Wherein, the dimension of the gap a in the radial direction of the pole post is La, which satisfies: 0 < La ≤ 10% Da; And / or, the gap a has a dimension of Ha3 in the axial direction of the pole post, satisfying: 0 < Ha3 ≤ 40% Da.

11. The cover plate assembly according to any one of claims 1-3, characterized in that, Along the axial direction of the columnar portion, the first region protrudes outward from the first surface; Wherein, a limiting groove is provided on the side of the first insulating member away from the cover plate, one end of the end cap near the columnar part is located in the limiting groove, and an exhaust groove is provided on the inner wall of the limiting groove, one end of the exhaust groove extends to the inner circumferential surface of the first insulating member, and the other end extends to the surface of the first insulating member away from the cover plate. Alternatively, the first insulating member may have an exhaust groove on the side opposite to the cover plate, with the two ends of the exhaust groove extending to the inner and outer circumferential surfaces of the first insulating member, respectively.

12. A single battery cell, characterized in that, include: case; Electrode assembly, housed within the housing; And the cover assembly as claimed in claim 11, wherein the cover is sealed to the housing.

13. A battery pack, characterized in that, It includes the battery cell as described in claim 12, wherein there are multiple battery cells and the multiple battery cells are electrically connected.

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