Battery cover plate structure and battery

Abstract

The utility model relates to the technical field of lithium batteries, and discloses a battery cover plate structure and a battery, the battery cover plate structure comprises: a cover plate body provided with a first mounting hole; the pole component comprises a pole top plate and a pole bottom plate; an insulating assembly is arranged between the pole top plate and the cover plate body and between the pole bottom plate and the cover plate body; the pole top plate comprises a top plate body and a boss part, and the boss part is suitable for penetrating through the first mounting hole and extending to the other side of the cover plate body; the pole bottom plate is arranged on the side, away from the top plate body, of the cover plate body in the first direction, and the pole bottom plate is welded to the pole lug; a second mounting hole is formed in the pole bottom plate; and the fastener penetrates through the second mounting hole along the first direction and is in threaded connection with the boss part. According to the battery cover plate structure provided by the utility model, the problem of poor riveting caused by riveting of the pole body and the riveting block and the phenomenon that the position of the pole of the cover plate is oxidized due to welding heat are avoided, and the cover plate assembly can be reworked and disassembled by disassembling the fastener after the cover plate is assembled.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium battery technical field, concretely relates to a battery cover plate structure and battery. BACKGROUND

[0002] With the increasingly mature lithium ion battery technology, lithium ion battery as power battery is widely used in electric vehicles and energy storage fields, and the use performance and safety of lithium ion battery are increasingly high. The lithium battery cover plate is a safety, assembly core component, and the structural design is crucial to the safety of the battery cell. However, the existing lithium battery cover plate needs to be riveted and pressed at the pole post position, and the riveting and pressing is often poor, and the pole post position of the oxidized cover plate appears due to welding heat, but it cannot be repaired and disassembled. SUMMARY

[0003] Therefore, the utility model provides a battery cover plate structure and battery to solve the problem that the existing lithium battery cover plate is prone to poor riveting and the phenomenon that the pole post position of the oxidized cover plate appears due to welding heat, but it cannot be repaired and disassembled.

[0004] In a first aspect, the utility model provides a battery cover plate structure, which comprises:

[0005] A cover plate body, a first mounting hole is formed in the cover plate body;

[0006] A pole post assembly comprising a pole post top plate and a pole post bottom plate, the pole post top plate and the pole post bottom plate are independently arranged; an insulating assembly is arranged between the pole post top plate, the pole post bottom plate and the cover plate body, and the insulating assembly is suitable for insulating the pole post top plate, the pole post bottom plate and the cover plate body;

[0007] The pole post top plate comprises a top plate body and a boss part, the top plate body is arranged on one side of the cover plate body in the first direction, and the boss part is suitable for penetrating through the first mounting hole and extending to the other side of the cover plate body in the first direction;

[0008] The pole post bottom plate is arranged on the side of the cover plate body away from the top plate body in the first direction, and the pole post bottom plate is suitable for being welded with the tab; a second mounting hole is formed in the pole post bottom plate;

[0009] A fastener penetrates through the second mounting hole in the first direction and is threadedly connected with the boss part.

[0010] Beneficial effects: the battery cover plate structure provided by the utility model, through setting the pole top plate, the pole top plate includes integrally formed top plate body and boss part, thereby replacing the riveting block and pole before improvement, not only avoid the problem of riveting block and riveting block due to riveting, but also avoid the phenomenon of oxidized cover plate pole position due to welding heat; the boss part passes through the first installation hole of the cover plate body and extends to the first direction of the other side of the cover plate body, thereby abutting with the pole bottom plate; the pole bottom plate is directly welded with the pole lug, and no other parts such as connecting sheet need to be additionally arranged between the pole bottom plate and the pole lug for connection, which not only can realize the structure cost reduction, but also is beneficial to realize the maximization of the effective space inside the battery cell, thereby improving the volume energy density of the battery cell; through the arrangement of the fastener, the fastener passes through the second installation hole of the pole bottom plate and is threadedly connected with the boss part, thereby realizing the dismounting connection between the pole bottom plate and the pole top plate, not only avoiding the potential failure risk between the pole bottom plate and the pole body due to welding, but also enabling the cover plate assembly to be returned to work and disassembled by dismounting the fastener after assembly, so as to facilitate maintenance and / or replacement of parts, and being beneficial to reducing the scrap cost of the cover plate assembly.

[0011] In an alternative embodiment, the insulating assembly includes a first insulating piece and a heat insulation piece; the first insulating piece is arranged between the top plate body and the cover plate body; the heat insulation piece is made of heat insulation material, and the heat insulation piece is arranged on the side of the top plate body along the first direction towards the first insulating piece.

[0012] Beneficial effects: by arranging the first insulating piece between the top plate body and the cover plate body, the top plate body and the cover plate body are insulated by the first insulating piece, avoiding internal short circuit of the battery cell caused by contact between the top plate body and the cover plate body; by arranging the heat insulation piece on the side of the top plate body along the first direction towards the first insulating piece, the welding heat when the tab and the top plate body are welded is insulated by the heat insulation piece, thereby avoiding the thermal influence of the welding heat on the first insulating piece and preventing the first insulating piece from being deformed by heat.

[0013] In an alternative embodiment, the top plate body is provided with an addressing hole on the side thereof along the first direction away from the boss part.

[0014] Beneficial effects: the addressing hole is identified by laser or visual positioning system, thereby improving the positioning accuracy and welding accuracy of the battery cell and the tab.

[0015] In an alternative embodiment, the boss part is provided with a threaded hole on the side thereof along the first direction towards the pole bottom plate, and the threaded hole is coaxially arranged with the second installation hole.

[0016] The fastener includes a stud part, and the stud part is adapted to pass through the second installation hole and threadedly cooperate with the threaded hole.

[0017] Beneficial effects: Thus, the detachable connection between the pole bottom plate and the pole top plate is realized, not only avoiding the potential failure risk between the pole bottom plate and the pole body due to welding, but also enabling the cover plate assembly to be disassembled for repair and / or replacement of parts after assembly, thereby reducing the scrap cost of the cover plate assembly.

[0018] In an optional embodiment, the fastener further comprises a first stepped portion, which is arranged at one end of the stud portion along the first direction;

[0019] The pole bottom plate comprises a second stepped portion, which is arranged along the circumference of the second mounting hole; the second stepped portion is in clearance fit with the first stepped portion, and the thickness of the second stepped portion along the first direction is greater than or equal to the thickness of the first stepped portion along the first direction; the side of the second stepped portion along the first direction close to the cover plate body is adapted to abut against the boss portion;

[0020] The fastener further comprises a third stepped portion, which is arranged at the side of the first stepped portion away from the stud portion along the first direction, and the third stepped portion is adapted to abut against the side of the second stepped portion away from the cover plate body along the first direction.

[0021] Beneficial effects: By arranging the first stepped portion and the third stepped portion on the fastener, and arranging the second stepped portion on the pole bottom plate, when the stud portion passes through the second mounting hole and is screwed into the threaded hole, the third stepped portion abuts against the second stepped portion along the first direction, thereby fastening the pole bottom plate and the pole top plate; when the fastener is just fastened in place, the first stepped portion abuts against the side of the boss portion facing the pole bottom plate, thereby avoiding deformation of the pole bottom plate due to excessive tightening, while ensuring the flow area between the pole bottom plate and the pole top plate.

[0022] In an optional embodiment, a rotation groove is arranged at the side of the third stepped portion away from the first stepped portion along the first direction, and the rotation groove is adapted to provide an interface for an external tool to transmit torque to the fastener.

[0023] Beneficial effects: Thus, it is convenient to use tools such as screwdrivers to screw the fastener through the rotation groove, facilitating the assembly and disassembly of the fastener.

[0024] In an optional embodiment, the diameter of the boss portion is D, and D satisfies D≥5mm.

[0025] Beneficial effects: It is convenient for processing the threaded hole, ensuring the structural strength of the boss portion, and avoiding breakage of the boss portion.

[0026] In an optional embodiment, the thickness of the top plate body is H, and H satisfies H≥1.5mm.

[0027] Beneficial effects: thus guarantee the strength of the top plate body, avoid the damage to the top plate body caused by the torque generated between different battery cells in the welding process, reduce the heat effect on the top plate body in the welding process with the bar plate.

[0028] In an alternative embodiment, the cover plate body is provided with a reinforcing rib on the side away from the pole plate in the first direction.

[0029] Beneficial effects: by providing a reinforcing rib on the side of the cover plate body away from the pole plate in the first direction, the strength of the cover plate body is increased, preventing the cover plate body from deforming during welding and / or under pressure, thereby improving the deformation resistance of the battery cell.

[0030] In a second aspect, the utility model also provides a battery, which comprises: a pole group and the battery cover plate structure as described above.

[0031] The pole group is provided with a tab on the side facing the battery cover plate structure, and the tab is adapted to be welded with the pole plate.

[0032] Beneficial effects: the battery of the second aspect comprises the battery cover plate structure of the first aspect, and therefore, the battery of the second aspect comprises all the beneficial effects of the battery cover plate structure of the first aspect. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the drawings needed in the following specific embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0034] Figure 1 It is a perspective view of a battery cover plate structure of the utility model embodiment.

[0035] Figure 2 It is the first explosion view of a battery cover plate structure of the utility model embodiment.

[0036] Figure 3 It is the second explosion view of a battery cover plate structure of the utility model embodiment.

[0037] Figure 4 It is Figure 1 It is the top view of the battery cover plate structure shown in the figure.

[0038] Figure 5 It is Figure 4 It is the sectional view of A-A section in the figure.

[0039] Figure 6 It is Figure 5A local enlarged view at B;

[0040] Figure 7 A sectional view of the pole post top plate of the battery cover plate structure according to an embodiment of the present application;

[0041] Figure 8 A first perspective view of the pole post top plate of the battery cover plate structure according to an embodiment of the present application;

[0042] Figure 9 A second perspective view of the pole post top plate of the battery cover plate structure according to an embodiment of the present application;

[0043] Figure 10 A sectional view of the pole post bottom plate of the battery cover plate structure according to an embodiment of the present application;

[0044] Figure 11 A bottom view of the pole post bottom plate of the battery cover plate structure according to an embodiment of the present application;

[0045] Figure 12 A connection perspective view of the pole post bottom plate and the fastener of the battery cover plate structure according to an embodiment of the present application.

[0046] Explanation of Reference Signs:

[0047] 10, cover plate body; 101, first mounting hole; 11, reinforcing rib;

[0048] 20, pole post assembly; 21, pole post top plate; 211, top plate body; 2111, addressing hole; 212, boss portion; 2121, threaded hole; 22, pole post bottom plate; 2201, second mounting hole; 2202, first limiting groove; 2203, second limiting groove; 221, second step portion;

[0049] 30, insulation assembly; 31, sealing ring; 32, first insulation piece; 33, second insulation piece; 34, heat insulation piece;

[0050] 40, fastener; 401, rotating groove; 41, stud portion; 42, first step portion; 43, third step portion. DETAILED DESCRIPTION

[0051] The lithium battery cover plate in the related art is riveted and pressed by the pole post body and the riveting block at the pole post position, and problems such as poor riveting and pressing, and oxidation of the cover plate at the pole post position due to welding heat often occur, but the lithium battery cover plate cannot be repaired and disassembled; the pole post body and the pole post bottom plate are welded by using a friction welding process, and welding defects are not easy to observe and identify, and there is a potential failure risk. In addition, the lithium battery cover plate is welded by using two parts of the pole post and the connecting sheet, and the occupied space is relatively large; the pole post is machined as a whole, and not only the machining cost is high, but also the automatic production is not facilitated.

[0052] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.

[0053] The embodiments of the utility model will be described below in combination with Figures 1 to 12 .

[0054] According to the embodiments of the utility model, on the one hand, a battery cover plate structure is provided, which comprises:

[0055] The cover plate body 10, please see Figure 2 and Figure 3 , a first mounting hole 101 is formed on it;

[0056] The pole column assembly 20, please see Figure 5 , comprising a pole column top plate 21 and a pole column bottom plate 22, the pole column top plate 21 and the pole column bottom plate 22 are independently arranged, the pole column top plate 21 and the pole column bottom plate 22 adopt a split structure and are detachably connected through a fastener 40, can adopt a platform design, and are more conducive to realizing the demand of batch cost reduction; The pole column top plate 21 and the pole column bottom plate 22 are provided with an insulating assembly 30 between the cover plate body 10, and the insulating assembly 30 is suitable for insulating between the pole column top plate 21 and the pole column bottom plate 22 and the cover plate body 10;

[0057] Please see Figure 6 and Figure 7 , the pole column top plate 21 comprises a top plate body 211 and a boss part 212, the top plate body 211 is arranged on the first direction side of the cover plate body 10, the boss part 212 is extended from one side of the top plate body 211 along the first direction to the direction away from the top plate body 211, and the boss part 212 is suitable for passing through the first mounting hole 101 and extending to the other side of the cover plate body 10 along the first direction;

[0058] The pole column bottom plate 22 is arranged on the side of the cover plate body 10 away from the top plate body 211 along the first direction, and the pole column bottom plate 22 is suitable for being welded with the tab; Please see Figure 10 , a second mounting hole 2201 is formed on the pole column bottom plate 22;

[0059] The fastener 40 passes through the second mounting hole 2201 along the first direction and is threadedly connected with the boss part 212, and the fastener 40 is suitable for detachably connecting the pole column bottom plate 22 with the pole column top plate 21.

[0060] The battery cover plate structure provided by the utility model has the polar post top plate 21, the polar post top plate 21 comprises the top plate body 211 and the boss part 212 which are integrally formed, thereby replacing the riveting block and the polar post before improvement, not only avoiding the problem of poor riveting of the polar post body and the riveting block, but also avoiding the phenomenon of oxidized cover plate polar post position due to welding heat; the boss part 212 passes through the first mounting hole 101 of the cover plate body 10 and extends to the other side of the cover plate body 10 in the first direction, thereby abutting against the polar post bottom plate 22; the polar post bottom plate 22 is directly welded with the polar lug, and no other parts such as connecting sheets are additionally arranged between the polar post bottom plate 22 and the polar lug for connection, which not only can realize structure cost reduction, but also is beneficial to realizing maximization of the effective space inside the battery cell, thereby improving the volume energy density of the battery cell; the fastener 40 is arranged, the fastener 40 passes through the second mounting hole 2201 of the polar post bottom plate 22 and is screw-connected with the boss part 212, thereby realizing the dismounting connection between the polar post bottom plate 22 and the polar post top plate 21, not only avoiding the potential failure risk between the polar post bottom plate 22 and the polar post body due to welding, but also enabling the cover plate assembly to be reworked and disassembled by dismounting the fastener 40 after cover plate assembly, so as to facilitate maintenance and / or replacement of parts, and being beneficial to reducing the scrap cost of the cover plate assembly.

[0061] Further, the top plate body 211 and the boss part 212 are an integrally formed structure.

[0062] Further, the fastener 40 can adopt a material with excellent performance strength such as stainless steel, so as to ensure the structural strength and thereby ensure the yield of the battery cell.

[0063] In some embodiments, as shown in Figure 2 , Figure 3 and Figure 6 , the insulation assembly 30 comprises a first insulation piece 32 and a heat insulation piece 34; the first insulation piece 32 is arranged between the top plate body 211 and the cover plate body 10; the heat insulation piece 34 is made of heat insulation material, and the heat insulation piece 34 is arranged on the side of the top plate body 211 along the first direction and towards the first insulation piece 32.

[0064] It should be noted that during the series and parallel assembly of the battery cell, the gasket and the top plate body 211 are welded on the side away from the cover plate body 10 along the first direction, if the top plate body 211 directly contacts the first insulation piece 32, the welding heat during welding of the gasket and the top plate body 211 is easy to cause thermal influence on the first insulation piece 32, causing thermal deformation of the first insulation piece 32, therefore, the heat insulation piece 34 needs to be arranged between the top plate body 211 and the first insulation piece 32 for heat insulation.

[0065] In this embodiment, the first insulating member 32 is arranged between the top plate body 211 and the cover plate body 10 to insulate the top plate body 211 and the cover plate body 10 through the first insulating member 32, so as to avoid internal short circuit of the battery cell caused by the contact between the top plate body 211 and the cover plate body 10; the heat insulation member 34 is arranged on the side of the top plate body 211 along the first direction and away from the first insulating member 32, so as to insulate the welding heat generated when the tab and the top plate body 211 are welded, thereby avoiding the thermal influence of the welding heat on the first insulating member 32 and preventing the first insulating member 32 from being deformed by heat.

[0066] As an alternative embodiment, the side of the top plate body 211 along the first direction and away from the first insulating member 32 can be coated with a heat insulation layer, and the heat insulation layer can insulate the welding heat generated when the tab and the top plate body 211 are welded from the first insulating member 32 after the pole assembly 20 and the cover plate body 10 are assembled, thereby preventing the first insulating member 32 from being deformed by heat.

[0067] Further, referring to Figure 6 , the insulating assembly 30 further comprises a sealing ring 31 coaxially arranged with the boss portion 212; the sealing ring 31 is arranged between the boss portion 212 and the pole bottom plate 22 and the cover plate body 10, and is made of an insulating material and is adapted to seal and insulate the boss portion 212 and the pole bottom plate 22 from the cover plate body 10; and Figure 6 , the sealing ring 31 is limited by the top plate body 211 on one side along the first direction and directly abuts against the pole bottom plate 22 on the other side, and the pole bottom plate 22 is adapted to fix the sealing ring 31.

[0068] The top plate body 211 and the pole bottom plate 22 can limit and fix the sealing ring 31 on both sides along the first direction by the fastener 40 penetrating through the second mounting hole 2201 along the first direction and being screwed with the boss portion 212, and the pole bottom plate 22 and the pole top plate 21 do not need to be connected by welding, thereby avoiding the thermal influence of welding on the sealing ring 31 and other plastic parts, so as to reduce the risk of poor sealing of the cover plate.

[0069] Further, referring to Figure 6 , the insulating assembly 30 further comprises a second insulating member 33 arranged between the pole bottom plate 22 and the cover plate body 10, and the second insulating member 33 is adapted to insulate the pole bottom plate 22 from the cover plate body 10.

[0070] In some embodiments, referring to Figure 1 , Figure 7 and Figure 9 , the top plate body 211 is provided with an addressing hole 2111 on the side along the first direction and away from the boss portion 212.

[0071] It should be noted that during the welding of the baffle plate and the top plate body 211, the battery cell and the baffle plate need to be positioned by a laser or visual positioning system to adjust the position of the welding head and improve the positioning and welding precision. By opening an addressing hole 2111 on the side of the top plate body 211 away from the boss portion 212 along the first direction, the addressing hole 2111 is identified by the laser or visual positioning system, thereby improving the positioning precision and welding precision of the battery cell and the baffle plate.

[0072] In some embodiments, please refer to Figure 7 and Figure 8 It is shown that the boss portion 212 is provided with a threaded hole 2121 on the side thereof facing the pole column bottom plate 22 along the first direction, and the threaded hole 2121 is coaxially arranged with the second mounting hole 2201.

[0073] Please refer to Figure 6 It is shown that the fastener 40 includes a stud portion 41, which is adapted to pass through the second mounting hole 2201 and threadedly cooperate with the threaded hole 2121.

[0074] In the present embodiment, by opening the threaded hole 2121 on the boss portion 212 and threadedly cooperating the stud portion 41 of the fastener 40 with the threaded hole 2121 through the second mounting hole 2201, the detachable connection between the pole column bottom plate 22 and the pole column top plate 21 is achieved, which not only avoids the potential failure risk between the pole column bottom plate 22 and the pole column body due to welding, but also enables the cover plate assembly to be disassembled by dismounting the fastener 40 after assembly, so as to facilitate maintenance and / or replacement of parts, which is conducive to reducing the scrap cost of the cover plate assembly.

[0075] In some embodiments, please refer to Figure 6 It is shown that the fastener 40 further includes a first stepped portion 42, which is arranged at one end of the stud portion 41 along the first direction.

[0076] Please refer to Figure 10 It is shown that the pole column bottom plate 22 includes a second stepped portion 221, which is arranged along the circumference of the second mounting hole 2201; the second stepped portion 221 is clearance-fitted with the first stepped portion 42, and the thickness of the second stepped portion 221 along the first direction is greater than or equal to the thickness of the first stepped portion 42 along the first direction, so that the fastener 40 keeps the pole column bottom plate 22 and the pole column top plate 21 fastened, avoiding loose connection or poor contact between the pole column bottom plate 22 and the pole column top plate 21; the side of the second stepped portion 221 along the first direction close to the cover plate body 10 is adapted to abut against the boss portion 212.

[0077] The fastener 40 further comprises a third stepped portion 43, which is arranged on the side of the first stepped portion 42 away from the stud portion 41 along the first direction, and is adapted to abut against the side of the second stepped portion 221 away from the cover plate body 10 along the first direction.

[0078] Preferably, the thickness of the second stepped portion 221 along the first direction is equal to the thickness of the first stepped portion 42 along the first direction, which can not only ensure the fastening of the fastener 40 to the pole bottom plate 22 and the pole top plate 21, but also avoid deformation of the pole bottom plate 22, and ensure the flow area between the pole bottom plate 22 and the pole top plate 21.

[0079] In the embodiment, by arranging the first stepped portion 42 and the third stepped portion 43 on the fastener 40, and arranging the second stepped portion 221 on the pole bottom plate 22, when the stud portion 41 passes through the second mounting hole 2201 and is screwed into the threaded hole 2121, the third stepped portion 43 abuts against the second stepped portion 221 along the first direction, thereby fastening the pole bottom plate 22 and the pole top plate 21, and when the fastener 40 is just fastened in place, the first stepped portion 42 abuts against the side of the boss portion 212 facing the pole bottom plate 22, thereby avoiding deformation of the pole bottom plate 22 due to excessive tightening, and ensuring the flow area between the pole bottom plate 22 and the pole top plate 21.

[0080] In some embodiments, as shown in Figure 12 The third stepped portion 43 is provided with a rotating groove 401 on the side away from the first stepped portion 42 along the first direction, which is adapted to provide an interface for an external tool to transmit torque to the fastener 40, thereby facilitating the use of tools such as screwdrivers to rotate the fastener 40 through the rotating groove 401, and facilitating the assembly and disassembly of the fastener 40.

[0081] In some embodiments, as shown in Figure 7 The diameter of the boss portion 212 is D, and D satisfies D≥5mm.

[0082] It should be noted that if the diameter of the boss portion 212 is too small, it is not only not convenient for the processing of the threaded hole 2121, but also easily reduces the structural strength of the boss portion 212, leading to the fracture of the boss portion 212, therefore, the diameter D of the boss portion 212 needs to satisfy D≥5mm.

[0083] Further, the nominal diameter of the stud portion 41 is M, and M satisfies M≥2mm, which is not only easy to process, but also can ensure the structural strength of the stud portion 41, avoiding the fracture of the stud portion 41.

[0084] In some embodiments, as shown in Figure 7 The thickness of the top plate body 211 is H, and H satisfies H≥1.5mm.

[0085] It should be noted that each battery cell needs to be welded with the bar plate at the same time, and a certain torque will be generated between different battery cells during the welding process; if the thickness of the top plate body 211 is thinner, the top plate body 211 will be more affected by heat during the welding process with the bar plate; if the top plate body 211 is too thin, the strength of the top plate body 211 is not enough, and it is easy to be damaged, therefore, the thickness H of the top plate body 211 needs to satisfy H≥1.5mm.

[0086] In this embodiment, the thickness H of the top plate body 211 satisfies H≥1.5mm, so as to ensure the strength of the top plate body 211, avoid damage to the top plate body 211 caused by the torque generated between different battery cells during the welding process, and reduce the heat effect on the top plate body 211 during the welding process with the bar plate.

[0087] In some embodiments, as shown in Figure 10 , the pole column bottom plate 22 is provided with a first limiting groove 2202 on one side thereof facing the cover plate body 10 in the first direction; please refer to Figure 5 and Figure 6 together, the convex portion 212 is at least partially installed in the first limiting groove 2202 at one end thereof close to the pole column bottom plate 22 in the first direction, which not only can enhance the radial connection strength between the pole column bottom plate 22 and the pole column top plate 21, but also can reduce the space occupation of the pole column bottom plate 22 and the pole column top plate 21 in the first direction, which is beneficial to maximize the effective space inside the battery cell, thereby improving the volume energy density of the battery cell.

[0088] Further, the convex portion 212 is a column structure, and the first limiting groove 2202 is circular.

[0089] In some embodiments, please refer to Figure 10 and Figure 11 together, the pole column bottom plate 22 is provided with a second limiting groove 2203 on one side thereof away from the cover plate body 10 in the first direction, and the second limiting groove 2203 is arranged along the circumference of the third stepped portion 43;

[0090] The third stepped portion 43 and the pole column bottom plate 22 are limited by spot welding in the second limiting groove 2203, so as to avoid loosening and / or falling off of the fastener 40, and ensure the firmness and reliability of the connection between the pole column bottom plate 22 and the pole column top plate 21.

[0091] It should be noted that the number of the second limiting groove 2203 can be one or multiple; in the process, spot welding can be performed in a single second limiting groove 2203, or spot welding can be performed in multiple second limiting grooves 2203, which can all achieve the limiting between the third stepped portion 43 and the pole column bottom plate 22.

[0092] Further, the second limiting groove 2203 has a depth of at least 0.5 mm in the first direction, so as to effectively avoid the welding spot from protruding from the surface of the pole plate, and prevent scratching of the tab and / or the insulating film.

[0093] In some embodiments, please refer to Figure 1 and Figure 2 As shown in the drawings, the cover plate body 10 is provided with a reinforcing rib 11 on the side thereof away from the pole plate 22 in the first direction.

[0094] It should be noted that, in the process, the finished battery cell is subjected to a constraint force in the first direction so as to cause an electrochemical reaction inside the battery cell, but if the strength of the cover plate is insufficient, the battery cell is prone to deformation during the constraint.

[0095] By providing the reinforcing rib 11 on the side of the cover plate body 10 away from the pole plate 22 in the first direction, the strength of the cover plate body 10 is increased, so as to prevent the cover plate body 10 from being deformed during welding and / or during compression, thereby improving the deformation resistance of the battery cell.

[0096] Further, the reinforcing rib 11 is punched and stretched from the cover plate body 10 in the first direction away from the pole plate 22.

[0097] According to the embodiments of the present application, on the other hand, a battery is also provided, which comprises a pole group and the battery cover plate structure as described above.

[0098] The side of the pole group facing the battery cover plate structure is provided with a tab, which is adapted to be welded to the pole plate 22.

[0099] The battery provided in the present embodiment comprises the battery cover plate structure as described above, and thus the battery in the present embodiment comprises all the beneficial effects of the battery cover plate structure as described above.

[0100] Although the embodiments of the present application have been described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes shall fall within the scope defined by the appended claims.

Claims

1. A battery cover structure, characterized in that: include: The cover body is provided with a first mounting hole; A pole assembly, comprising a pole top plate and a pole bottom plate, wherein the pole top plate and the pole bottom plate are independently provided; an insulating assembly is provided between the pole top plate, the pole bottom plate and the cover plate body, and the insulating assembly is suitable for insulating the pole top plate, the pole bottom plate and the cover plate body; The pole top plate includes a top plate body and a boss portion, wherein the top plate body is arranged on one side of the cover plate body in the first direction, and the boss portion is adapted to pass through the first mounting hole and extend to the other side of the cover plate body in the first direction; The pole bottom plate is arranged on a side of the cover body away from the top plate body along the first direction, and the pole bottom plate is suitable for welding with the pole tab; a second mounting hole is opened on the pole bottom plate; A fastener passes through the second mounting hole along a first direction and is threadedly connected to the boss portion.

2. The battery cover structure according to claim 1, characterized in that: The insulating assembly includes a first insulating member and a thermal insulation member; the first insulating member is arranged between the top plate body and the cover plate body; the thermal insulation member is made of a thermal insulation material, and the thermal insulation member is arranged on one side of the top plate body along the first direction toward the first insulating member.

3. The battery cover structure according to claim 1, characterized in that: An addressing hole is formed on a side of the top plate body away from the boss portion along the first direction.

4. The battery cover structure according to claim 1, characterized in that: A threaded hole is formed on one side of the boss portion toward the pole bottom plate along the first direction, and the threaded hole is coaxially arranged with the second mounting hole; The fastener includes a stud portion adapted to pass through the second mounting hole and be threadedly engaged with the threaded hole.

5. The battery cover structure according to claim 4, characterized in that: The fastener further includes a first step portion, which is provided at one end of the stud portion along the first direction; The pole bottom plate includes a second step portion, which is arranged along the circumference of the second mounting hole; the second step portion is clearance-matched with the first step portion, and the thickness of the second step portion along the first direction is greater than or equal to the thickness of the first step portion along the first direction; the side of the second step portion close to the cover plate body along the first direction is suitable for abutting against the boss portion; The fastener further includes a third step portion, which is arranged on a side of the first step portion away from the stud portion along the first direction, and is suitable for abutting against a side of the second step portion away from the cover body along the first direction.

6. The battery cover structure according to claim 5, characterized in that: A rotation groove is formed on a side of the third step portion away from the first step portion along the first direction, and the rotation groove is suitable for providing an interface for an external tool to transmit torque to the fastener.

7. The battery cover structure according to claim 1, characterized in that: The diameter of the boss portion is D, and D satisfies D≥5mm.

8. The battery cover structure according to claim 1, characterized in that: The thickness of the top plate body is H, and H satisfies H≥1.5mm.

9. The battery cover structure according to any one of claims 1 to 8, characterized in that: A reinforcing rib is provided on one side of the cover body away from the pole bottom plate along the first direction.

10. A battery, characterized in that: include: A pole group, and a battery cover structure as claimed in any one of claims 1 to 9; A pole lug is provided on one side of the pole group facing the battery cover structure, and the pole lug is suitable for being welded to the pole bottom plate.

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