Cover plate assembly, battery cell and battery

Abstract

The utility model provides a cover plate assembly, a battery cell and a battery, and relates to the technical field of batteries. The cover plate assembly comprises a cover plate, a pole and a first insulating part; the cover plate is provided with a through hole; the pole comprises a first section and a second section which are connected with each other, the diameter of the first section is larger than that of the second section, a first insertion structure is arranged on the peripheral surface of the first section, and the second section is arranged in the through hole in a penetrating manner and is in sealing fit with the through hole; the first insulating part comprises an isolating part and a connecting part which are connected with each other, and the isolating part sleeves the second section and is located between the first section and the cover plate; a second inserting structure is arranged on one side of the connecting part; and along the radial direction of the pole, the second plugging structure is plugged with the first plugging structure to limit the pole to rotate around the axial direction. According to the invention, the first insulating part is inserted into the pole, so that the first insulating part and the pole form stop fit in the circumferential direction, the torque of the pole during rotation can be increased, the pole is effectively prevented from being driven by a soldering lug to twist, and the reliability of fit between the pole and the cover plate can be improved.

Description

TECHNICAL FIELD

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

[0002] The battery cell comprises a shell, a cover plate assembly covering the shell, and an electrode assembly arranged in the shell. The cover plate assembly comprises a cover plate, a post arranged on the cover plate, a sealing ring sealing a matching part between the post and the cover plate, an upper plastic part insulating and separating an end part of the post outside the shell from the cover plate, and a lower plastic part insulating and separating an end part of the post inside the shell from the cover plate.

[0003] In the related art, a welding sheet is used to connect the posts of two adjacent battery cells to electrically connect the two battery cells. However, heat is generated during the charging and discharging of the battery cell, which causes the overall expansion of the battery cell, especially the battery cell with high energy density. When the two connected battery cells expand inconsistently, the two battery cells will generate a force on each other's post through the welding sheet. Eventually, the welding sheet will drive the post to twist, thereby reducing the reliability of the matching between the post and the cover plate. CONTENT OF THE UTILITY MODEL

[0004] Embodiments of the present application provide a cover plate assembly, a battery cell and a battery, which can improve the torque of the post to improve the reliability of the matching between the post and the cover plate.

[0005] In a first aspect, embodiments of the present application provide a cover plate assembly, which comprises a cover plate, a post and a first insulating part; the cover plate is provided with a through hole; the post comprises a first segment and a second segment connected to each other, the diameter of the first segment is greater than the diameter of the second segment, and the outer peripheral surface of the first segment is provided with a first plug-in structure; the second segment is arranged in the through hole and sealingly matched with the through hole; the first insulating part comprises a separation part and a connecting part connected to each other, the separation part is sleeved on the second segment and located between the first segment and the cover plate; one side of the connecting part is provided with a second plug-in structure; along the radial direction of the post, the second plug-in structure is plugged into the first plug-in structure to limit the rotation of the post around the axial direction.

[0006] In an embodiment, the first plug-in structure is a slot, and the second plug-in structure is protruded from the surface of the connecting part to the slot and inserted into the slot.

[0007] In an embodiment, the slot is a through slot, and the extension direction of the slot is parallel to the axis of the post.

[0008] In an embodiment, the diameter of the first segment is D, along the radial direction of the post, the slot has a depth size L2, and 0.25≤L2 / D≤0.5 is satisfied.

[0009] In an embodiment, the plurality of slots are arranged along a circumferential direction of the pole post, and a portion of the pole post between two circumferentially adjacent slots is a tooth portion. A length dimension of the tooth portion from a tooth root to a tooth top of the tooth portion along a radial direction of the pole post is L1, and a width dimension of the tooth portion along the circumferential direction of the pole post is X, and the following condition is satisfied: 2 / 3≤X / L1≤3.

[0010] In an embodiment, a bottom wall of the slot is an arc surface, and the bottom wall of the slot is smoothly connected to a side wall of the slot.

[0011] In an embodiment, an outer circumferential surface of the isolation portion is a polygon, and the cover plate is provided with a limiting sink, the limiting sink has a shape consistent with the shape of the isolation portion, the isolation portion is arranged in the limiting sink, and the outer circumferential surface of the isolation portion is in contact with a side wall of the limiting sink.

[0012] In an embodiment, the cover plate assembly further comprises a connecting piece and a sealing ring. The connecting piece is connected to an end of the second segment away from the first segment. The sealing ring is sleeved on the second segment and at least partially located between the through hole and the second segment. An end of the sealing ring away from the first segment is in abutment with the connecting piece.

[0013] In a second aspect, an embodiment of the present application provides an electric core, which comprises a shell, an electrode assembly, and the aforementioned cover plate assembly. The electrode assembly is arranged in the shell, and the cover plate is combined with the shell.

[0014] In a third aspect, an embodiment of the present application provides a battery, which comprises a plurality of electric cores and a connecting row. The connecting row connects adjacent two electric cores.

[0015] The beneficial effects of the embodiments of the present application are as follows:

[0016] In the embodiments of the present application, the first insulating piece is inserted into the pole post, so that the first insulating piece and the pole post are in blocking cooperation in the circumferential direction. Therefore, the torque when the pole post rotates can be increased, so that the pole post is effectively prevented from being twisted by the welding piece, and the reliability of the cooperation between the pole post and the cover plate can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiment description. 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 any creative effort on the basis of these drawings.

[0018] Figure 1 is an exploded view of the cover plate assembly provided by the embodiments of the present application;

[0019] Figure 2 is a structural schematic view of the pole post provided by the embodiments of the present application.

[0020] Figure 3 is a structural schematic view of the first insulating piece provided by an embodiment of the present application;

[0021] Figure 4 is a top view of the pole provided by an embodiment of the present application;

[0022] Figure 5 is a partial top view of the cover plate assembly provided by an embodiment of the present application;

[0023] Figure 6 is a sectional view along Figure 5 A-A in FIG. 1;

[0024] Figure 7 is a structural schematic view of the sealing ring provided by an embodiment of the present application;

[0025] Figure 8 is a structural schematic view of the battery provided by an embodiment of the present application;

[0026] Figure 9 is a structural schematic view of the battery provided by an embodiment of the present application.

[0027] Legend of reference signs:

[0028] 1 - cover plate assembly;

[0029] 11 - cover plate; 111 - through hole; 112 - limiting sink;

[0030] 12 - pole; 121 - first section; 122 - second section; 123 - first plug-in structure; 124 - tooth portion; 125 - groove bottom wall; 126 - groove side wall; 127 - stepped groove;

[0031] 13 - first insulating piece; 131 - isolation portion; 132 - second plug-in structure; 133 - connecting portion

[0032] 14 - sealing ring; 141 - third section; 142 - fourth section;

[0033] 15 - connecting sheet; 151 - mating hole;

[0034] 16 - second insulating piece;

[0035] 2 - battery cell; 21 - shell; 22 - electrode assembly; 23 - positive electrode tab; 24 - negative electrode tab;

[0036] 3 - battery; 31 - box body; 32 - box cover. DETAILED DESCRIPTION

[0037] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative work are within the scope of the present application. In addition, it should be understood that the specific implementation described herein is only used to illustrate and explain the present application, and is not used to limit the present application.

[0038] Please refer to Figures 1 to 3 , Figure 1 is an exploded view of the cover plate assembly 1 provided by the embodiments of the present application, Figure 2 is a structural schematic view of the pole 12 provided by the embodiments of the present application, Figure 3 is a structural schematic view of the first insulating member 13 provided by the embodiments of the present application. The embodiments of the present application provide a cover plate assembly 1. The cover plate assembly 1 comprises a cover plate 11, a pole 12 and a first insulating member 13. The cover plate 11 is provided with a through hole 111. The pole 12 comprises a first segment 121 and a second segment 122 connected with each other. The diameter of the first segment 121 is greater than the diameter of the second segment 122. The outer peripheral surface of the first segment 121 is provided with a first plug structure 123. The second segment 122 is arranged in the through hole 111 and sealingly cooperates with the through hole 111. The first insulating member 13 comprises an isolation part 131 and a connecting part 133 connected with each other. The isolation part 131 is sleeved on the second segment 122 and located between the first segment 121 and the cover plate 11. One side of the connecting part 133 is provided with a second plug structure 132. In the radial direction of the pole 12, one side of the second plug structure 132 is plugged with the first plug structure 123 to limit the rotation of the pole 12 around the axial direction.

[0039] It can be understood that the pole 12 is a T-shaped pole 12.

[0040] When the first segment 121 is located outside the battery cell 2, this arrangement can avoid the pole 12 from falling into the battery cell 2. Correspondingly, the first insulating member 13 is also located outside the battery cell 2 and is used as an upper plastic member to insulate and isolate the pole 12 from the cover plate 11.

[0041] When the first segment 121 is located inside the battery cell 2, this arrangement can avoid the pole 12 from being separated from the cover plate 11 due to the pressure increase inside the battery cell 2. Correspondingly, the first insulating member 13 is located inside the battery cell 2 and is used as a lower plastic member. At this time, the first insulating member 13 can not only insulate and isolate the pole 12 from the cover plate 11, but also insulate and isolate the electrode assembly 22 and the like from the cover plate 11.

[0042] It can be understood that one side of the second plug structure 132 is radially plugged with the first plug structure 123 along the pole column 12. Specifically, the second plug structure 132 can be a slot, and the first plug structure 123 can be a structure provided outwardly and insertable into the slot; or the first plug structure 123 can be a slot, and the second plug structure 132 can be a structure provided outwardly and insertable into the slot.

[0043] In the embodiment, by plugging the first insulating piece 13 with the pole column 12, the first insulating piece 13 is formed in a stop cooperation with the pole column 12 in the circumferential direction, so that the torque of the pole column 12 during rotation can be increased, so as to effectively avoid the pole column 12 from being twisted by the welding piece, and thus the reliability of the cooperation between the pole column 12 and the cover plate 11 can be improved.

[0044] Please refer to Figure 2 In an embodiment, the first plug structure 123 is a slot. The second plug structure 132 is provided outwardly from the surface of the connecting part 133 and inserted into the slot. In this way, the weight of the pole column 12 can be reduced, which is beneficial to the lightweight design of the battery cell 2.

[0045] Please refer to Figure 2 In an embodiment, the slot is a through slot. The extension direction of the slot is parallel to the axis of the pole column 12. In this way, the assembly difficulty between the pole column 12 and the first insulating piece 13 can be reduced, so that the assembly between the pole column 12 and the first insulating piece 13 can be realized by moving them towards each other along the extension direction of the slot, and thus the assembly efficiency can be improved.

[0046] Please refer to Figure 4 In an embodiment, the diameter of the first section 121 is D. The slot has a depth dimension L2 in the radial direction of the pole column 12, and satisfies: 0.25≤L2 / D≤0.5.

[0047] It can be understood that the ratio between the depth dimension L2 of the slot and the diameter D of the first section 121 includes but is not limited to 0.25, 0.28, 0.3, 0.32, 0.35, 0.37, 0.4, 0.41, 0.44, 0.45, 0.47, 0.5.

[0048] In the embodiment, by the above limitation, the suitable plug size between the first insulating piece 13 and the pole column 12 can be ensured, so as to effectively ensure the reliability of the stop cooperation of the first insulating piece 13 on the pole column 12 in the twisting direction, and the first section 121 can have a suitable area for welding with other components, so as to improve the operability of the welding of the first end with other components.

[0049] Please refer to Figure 4 , Figure 4is a top view of the pole 12 provided by an embodiment of the present application. In an embodiment, the slot has a plurality. The plurality of slots are arranged along the circumference of the pole 12. The pole 12 is located between two circumferentially adjacent slots, and the location is a tooth portion 124. The length dimension from the root of the tooth portion 124 to the top of the tooth portion 124 along the radial direction of the pole 12 is L1, and the width dimension of the tooth portion 124 along the circumferential direction of the pole 12 is X, and the following condition is met: 2 / 3≤X / L1≤3.

[0050] It can be understood that the ratio between the width dimension X of the tooth portion 124 and the length dimension L1 from the root of the tooth portion 124 to the top of the tooth portion 124 includes but is not limited to 2 / 3, 0.7, 0.9, 1, 1.2, 1.5, 1.7, 1.9, 2, 2.2, 2.5, 2.7, 3.

[0051] In the present embodiment, by the above limitation, the tooth portion 124 can be avoided to be an elongated structure, so that the tooth portion 124 can have a suitable connection dimension relative to the length dimension L1 and the central portion of the first segment 121, so that the tooth portion 124 can be effectively avoided to be broken.

[0052] Please refer to Figure 2 In an embodiment, the bottom wall 125 of the slot is an arc surface, and the bottom wall 125 of the slot is smoothly transitioned to the side wall 126 of the slot. In this way, the stress on the root of the tooth portion 124 can be reduced, so that the reliability of the connection between the tooth portion 124 and the central portion of the first segment 121 can be improved.

[0053] Please refer to Figure 1 In an embodiment, the outer circumferential surface of the isolation portion 131 is a polygon. The cover plate 11 is provided with a limiting sink 112. The shape of the limiting sink 112 is consistent with the shape of the isolation portion 131. The isolation portion 131 is arranged in the limiting sink 112, and the outer circumferential surface of the isolation portion 131 is in contact with the side wall of the limiting sink 112. In this way, the side wall of the limiting sink 112 and the outer circumferential surface of the first insulating member 13 are in abutting engagement, so that the limiting property of the cover plate 11 on the first insulating member 13 can be improved, so as to effectively avoid the first insulating member 13 from rotating relative to the cover plate 11. Finally, the limiting property of the first insulating member 13 on the pole 12 can be improved, so as to effectively avoid the pole 12 from being twisted by the soldering piece.

[0054] Please refer to Figure 1 or Figure 3 In an embodiment, the outer circumferential surface of the isolation portion 131 is an octagon. In this way, the isolation portion 131 and the cover plate 11 can have an angular abutting engagement surface, so as to effectively ensure the limiting property of the cover plate 11 on the first insulating member 13, and the first insulating member 13 can have a larger area, so as to have a suitable structural strength.

[0055] Please refer to Figure 3In an embodiment, the first plug structure 123 and the second plug structure 132 are provided in plurality. The plurality of first plug structures 123 are arranged along the circumference of the pole 12. The plurality of second plug structures 132 are arranged in one-to-one correspondence with the plurality of first plug structures 123. In this way, the matching structure between the first insulating piece 13 and the pole 12 can be increased, so as to improve the reliability of the first insulating piece 13 in limiting the torsion of the pole 12, so as to increase the torque when the pole 12 rotates, thereby effectively avoiding the pole 12 from being twisted by the soldering sheet.

[0056] In addition, the plurality of first plug structures 123 and the plurality of second plug structures 132 can make the plug matching parts between the first insulating piece 13 and the pole 12 more evenly distributed, so as to improve the stress state of the first insulating piece 13 and the pole 12.

[0057] Please refer to Figure 3 In an embodiment, the connecting part 133 extends along the circumference of the pole 12 to form a ring shape. In this way, the overall strength of each insulating piece 13 can be improved, so as to improve the strength of the part where the first insulating piece 13 is plugged with the pole 12, thereby improving the reliability of the first insulating piece 13 in limiting the torsion of the pole 12.

[0058] Please refer to Figure 5 and Figure 6 , Figure 5 is a partial top view of the cover plate assembly 1 provided by an embodiment of the present application, Figure 6 is a sectional view along Figure 5 A-A in FIG. 1. In an embodiment, the cover plate assembly 1 further comprises a sealing ring 14. The sealing ring 14 is sleeved on the second section 122 and at least partially located between the through hole 111 and the second section 122. In this way, the sealing ring 14 can effectively ensure the sealing performance of the matching part between the pole 12 and the cover plate 11, so as to improve the reliability of the battery cell 2.

[0059] Please refer to Figure 6 and Figure 7 , Figure 7 is a structural schematic view of the sealing ring 14 provided by an embodiment of the present application. In an embodiment, the sealing ring 14 comprises a third section 141 and a fourth section 142. The third section 141 is located on the inner side of the isolation part 131 and between the first section 121 and the cover plate 11. The inner circumferential side of the third section 141 is connected with one end of the fourth section 142. The fourth section 142 is located between the through hole 111 and the second section 122. In this way, the sealing structure can be configured between the first section 121 and the cover plate 11 and between the second section 122 and the cover plate 11, so as to improve the sealing performance of the matching part between the pole 12 and the cover plate 11.

[0060] Please refer to Figure 6In an embodiment, the outer diameter of the third section 141 is smaller than the inner diameter of the isolation section 131 when the sealing ring 14 is in the original state. In this way, a gap can be formed between the sealing ring 14 and the isolation section 131, so that the sealing ring 14 can be compressed when the cover plate assembly 1 is assembled, and the third section 141 can be deformed radially outward to provide a deformation space. In this way, the sealing performance of the sealing ring 14 on the matching part between the pole column 12 and the cover plate 11 can be improved, and the stress state of the sealing ring 14 can be improved to improve the reliability of the sealing ring 14.

[0061] Optionally, the third end deformed radially outward after the cover plate 11 is assembled and the sealing ring 14 is compressed can just fill the gap.

[0062] Please refer to Figure 1 In an embodiment, the first insulating part 13 is arranged on the side of the cover plate 11 away from the electrode assembly 22 of the battery cell 2. In this way, the axial size of the plug-in matching part between the first insulating part 13 and the pole column 12 can be increased without affecting the layout of the internal components of the battery cell 2, so that the limiting performance of the first insulating part 13 on the torsion of the pole column 12 can be improved, and the energy density of the battery cell 2 can be ensured.

[0063] Please refer to Figure 6 In an embodiment, the cover plate assembly 1 further comprises a connecting piece 15. The connecting piece 15 is connected to the end of the second section 122 away from the first section 121. It can be understood that the connecting piece 15 can be used to connect the tab to the pole column 12 to improve the reliability of the current flow between the pole column 12 and the tab.

[0064] Please refer to Figure 6 In an embodiment, the second section 122 is provided with a stepped groove 127 at the end away from the first section 121. The stepped groove 127 extends along the circumference of the pole column 12 to form an annular shape. The connecting piece 15 is provided with a matching hole 151. The matching hole 151 is sleeved on the part of the second section 122 provided with the stepped groove 127. In this way, the connecting piece 15 can be positioned by the cooperation of the stepped groove 127 and the matching hole 151, so that the connection precision and the ease of operation between the connecting piece 15 and the pole column 12 can be improved, and the welding part between the connecting piece 15 and the pole column 12 can be arranged far away from the sealing ring 14, so that the heat influence of the sealing ring 14 when the connecting piece 15 and the pole column 12 are welded can be reduced, and the reliability of the sealing ring 14 can be improved.

[0065] Please refer to Figure 6In an embodiment, the cover plate assembly 1 further comprises a sealing ring 14. The sealing ring 14 is sleeved on the second section 122 and located at least partially between the through hole 111 and the second section 122. An end of the sealing ring 14 away from the first section 121 abuts against the connecting piece 15. In this way, when the cover plate assembly 1 is assembled, the connecting piece 15 can axially extrude the sealing ring 14, so as to improve the sealing performance of the sealing ring 14 on the matching part between the cover plate 11 and the pole 12.

[0066] It can be understood that, in order to facilitate the abutment of the connecting piece 15 and the sealing ring 14 and avoid the contact between the connecting piece 15 and the cover plate 11, the side of the sealing ring 14 close to the connecting piece 15 exceeds the through hole 111, so that the connecting piece 15 can abut against the sealing ring 14 and also ensure a sufficient spacing between the connecting piece 15 and the cover plate 11.

[0067] Please refer to Figure 1 or Figure 6 In an embodiment, the cover plate assembly 1 further comprises a second insulating member 16 located on the side of the cover plate 11 away from the first insulating member 13. It can be understood that the second insulating member 16 insulates and separates the electrode assembly 22, the connecting piece 15 and other components located in the battery cell 2 from the cover plate 11, so as to improve the reliability of the current overcurrent in the battery cell 2 and avoid short circuit.

[0068] Please refer to Figure 8 , Figure 8 is a structural schematic diagram of a battery cell 2 provided by an embodiment of the present application. Accordingly, an embodiment of the present application provides a battery cell 2. The battery cell 2 comprises a shell 21, an electrode assembly 22 and the aforementioned cover plate assembly 1. The electrode assembly 22 is arranged in the shell 21. The cover plate 11 is covered with the shell 21.

[0069] In the present embodiment, by using the cover plate assembly 1 provided by some embodiments of the present application, the first insulating member 13 and the pole 12 form a stop matching in the circumferential direction, so as to increase the torque when the pole 12 rotates, so as to effectively avoid the pole 12 from being twisted by the welding piece, and thus improve the reliability of the matching between the pole 12 and the cover plate 11. In this way, the reliability of the battery cell 2 can be improved.

[0070] Wherein, the battery cell 2 can be a cylindrical battery cell 2 or a square battery cell 2, as shown in Figure 8 .

[0071] In addition, the cover plate 11 is provided with two poles 12, and the two poles 12 are respectively provided with the first insulating member 13 inserted thereinto. One pole 12 is connected with the positive electrode lug 23 through one adapter, and the other pole 12 is connected with the negative electrode lug 24 through another adapter.

[0072] Please refer to Figure 9 , Figure 9is a structural schematic diagram of the battery 3 provided by the embodiments of the present application. Accordingly, the embodiments of the present application provide a battery 3. The battery 3 comprises a connecting row and the aforementioned battery cell 2. The battery cell 2 is multiple. The connecting row is multiple. The multiple connecting rows connect two adjacent battery cells 2.

[0073] It can be understood that the battery 3 can further comprise a box body 31 and a box cover 32 covering the box body 31, and the battery cell 2 and the connecting row are arranged in the box body 31.

[0074] In the embodiment, by adopting the battery cell 2 provided by some embodiments of the present application, the first insulating member 13 and the pole 12 are formed in a circumferential blocking cooperation, so as to increase the torque when the pole 12 rotates, so as to effectively avoid the pole 12 being twisted by the welding piece, and then the reliability of the cooperation between the pole 12 and the cover plate 11 can be improved. In this way, the reliability of the battery cell 2 can be improved.

[0075] Optionally, the positive pole 12 of the battery cell 2 is made of aluminum, and the negative pole 12 is made of copper. The connecting piece 15 is made of copper. Therefore, in order to improve the easy operability of the welding between the connecting piece 15 and the positive pole 12, a nickel layer is arranged at least at the position where the connecting piece 15 is welded with the positive pole 12, which is optionally a nickel plating layer. In this way, by taking the nickel layer as an intermediate medium, the welding difficulty caused by the physical and chemical property difference between aluminum and copper can be reduced, so as to improve the welding quality.

[0076] The embodiments of the present application are described in detail above, and the specific examples are applied to the principle and implementation mode of the present application. The above embodiment description is only used to help understand the method of the present application and its core idea; at the same time, for those skilled in the art, according to the idea of the present application, the specific implementation mode and application range will be changed, and the above description should not be understood as the limitation of the present application.

Claims

1. A cover plate assembly, characterized by The application relates to a cover plate assembly for a battery cell. The cover plate assembly comprises: a cover plate provided with a through hole; a pole post comprising a first section and a second section connected with each other, the diameter of the first section being larger than that of the second section, and the outer periphery of the first section being provided with a first plug structure; the second section is arranged in the through hole and is in sealing cooperation with the through hole; 2. The cover plate assembly of claim 1, wherein, a first insulating part comprising an isolation section and a connecting section connected with each other, the isolation section being sleeved on the second section and located between the first section and the cover plate; one side of the connecting section is provided with a second plug structure; along the radial direction of the pole post, the second plug structure is plugged into the first plug structure to limit the rotation of the pole post around the axial direction.

3. The cover plate assembly of claim 2, wherein, The first plug structure is a slot, and the second plug structure is protruded from the surface of the connecting section to the slot and is plugged into the slot.

4. The cover plate assembly of claim 3, wherein, The slot is a through slot, and the extension direction of the slot is parallel to the axis of the pole post.

5. The cover plate assembly of claim 3, wherein, The diameter of the first section is D, and along the radial direction of the pole post, the slot has a depth dimension L2, and 0.25<=L2 / D<=0.5 is met.

6. The cover plate assembly of any one of claims 2-5, wherein, The slot has a plurality of slots, and the plurality of slots are arranged at intervals along the circumferential direction of the pole post; the part of the pole post located between two circumferentially adjacent slots is a tooth part, and along the radial direction of the pole post, the length dimension from the root of the tooth part to the top of the tooth part is L1, and along the circumferential direction of the pole post, the width dimension of the tooth part is X, and 2 / 3<=X / L1<=3 is met.

7. The cover plate assembly of any one of claims 1-5, wherein, The bottom wall of the slot is an arc surface, and the bottom wall of the slot is smoothly connected to the side wall of the slot.

8. The cover plate assembly of any one of claims 1-5, wherein, The outer periphery of the isolation section is a polygon, the cover plate is provided with a limiting sink, the shape of the limiting sink is consistent with that of the isolation section, the isolation section is arranged in the limiting sink, and the outer periphery of the isolation section is in contact with the side wall of the limiting sink.

9. An electric cell characterized by The cover plate assembly further comprises a connecting sheet and a sealing ring, the connecting sheet is connected with the end of the second section away from the first section; the sealing ring is sleeved on the second section and is at least partially located between the through hole and the second section, and the end of the sealing ring away from the first section is in abutment with the connecting sheet. The application relates to a battery cell. The battery cell comprises: a shell; 10. A battery, characterized by an electrode assembly arranged in the shell; and the cover plate is combined with the shell. The application relates to a battery cell. The battery cell comprises: a plurality of the battery cells according to claim 9; and a plurality of connecting rows connecting two adjacent battery cells.

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