Top cover structure, energy storage device and electric equipment

Abstract

The invention discloses a top cover structure, an energy storage device and electric equipment. The top cover structure provided by the embodiment of the invention comprises a pole, a top cover sheet, a sealing piece and a first insulating piece, the top cover sheet, the sealing piece and the first insulating piece are sleeved on the pole; the outer side wall of the pole protrudes outwards in the direction away from the center axis of the pole to form a first limiting step. And the sealing element is positioned between the top cover sheet and the pole along the axial direction of the pole. In the axial direction of the pole, the first insulating part is located between the first limiting step and the sealing part, and the orthographic projection of the outer periphery of the sealing part and the orthographic projection of the first insulating part on the face, close to the sealing part, of the top cover piece are partially overlapped. The inner side wall, close to the pole, of the first insulating part abuts against the vertical face of the first limiting step. Therefore, a gap can be prevented from being generated between the sealing piece and the first insulating piece in the radial direction of the pole, so that a short-circuit current loop formed by conduction between the pole and the top cover plate due to the fact that electrolyte enters the gap is avoided, and the risk that a battery cell fails and is on fire is reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a top cover structure, an energy storage device and an electrical equipment. Background Art

[0002] Rechargeable battery, also known as rechargeable battery or storage battery, refers to a battery that can be used continuously by activating the active material after the battery is discharged by charging. The recyclable nature of secondary batteries makes it gradually become the main power source for electrical equipment. Secondary batteries have also become an important force in promoting energy transformation and green development. As the demand for secondary batteries gradually increases, secondary batteries also face some challenges, and the safety of batteries has received great attention. At present, in the top cover design of secondary batteries, the sealing ring and the lower plastic are located between the bare aluminum sheet and the pole, and the sealing ring and the lower plastic are arranged along the radial direction of the pole. However, there will be a gap between the assembled sealing ring and the lower plastic in the radial direction, and electrolyte may enter and remain during the assembly and transportation of the battery cell. The entry of the electrolyte will cause the dielectric constant between the bare aluminum sheet and the pole to change, thereby causing the bare aluminum sheet and the pole to be conductive, forming a short-circuit current loop, resulting in the risk of failure and fire of the battery cell. Summary of the invention

[0003] The embodiments of the present application provide a top cover structure, an energy storage device and an electrical device to solve at least one of the above-mentioned technical problems.

[0004] The top cover structure of the embodiment of the present application comprises a pole, a top cover sheet, a seal and a first insulating member, wherein the top cover sheet, the seal and the first insulating member are all sleeved on the pole;

[0005] The outer side wall of the pole is convex in a direction away from the central axis of the pole to form a first limiting step;

[0006] Along the axial direction of the pole, the sealing member is located between the top cover sheet and the pole;

[0007] Along the axial direction of the pole, the first insulating member is located between the first limiting step and the sealing member, and the outer peripheral edge of the sealing member overlaps with the positive projection of the first insulating member on the side of the top cover sheet close to the sealing member; the inner side wall of the first insulating member close to the pole abuts against the vertical surface of the first limiting step.

[0008] In the top cover structure of the embodiment of the present application, along the axial direction of the pole, the first insulating member is located between the first limiting step and the sealing member, and the outer peripheral edge of the sealing member overlaps with the positive projection of the first insulating member on the side of the top cover sheet close to the sealing member, which can avoid the seal and the first insulating member from generating a gap in the radial direction of the pole, thereby avoiding the electrolyte from entering the gap and causing conduction between the pole and the top cover sheet to form a short-circuit current loop, thereby reducing the risk of battery cell failure and fire.

[0009] In certain embodiments, along the axial direction of the pole, the inner circumference of the seal is pressed between the top cover sheet and the pole.

[0010] In the above technical solution, along the axial direction of the pole, the inner circumference of the seal is pressed between the top cover sheet and the pole, so that the inner circumference of the seal can seal the gap between the top cover sheet and the pole, preventing the electrolyte from entering and directly connecting the top cover sheet and the pole.

[0011] In some embodiments, the outer side wall of the pole is convex in a direction away from the central axis of the pole to form a second limiting step, and the inner side wall of the top cover sheet is concave in a direction away from the central axis of the pole to form a third limiting step;

[0012] Along the radial direction of the pole, the sealing member is located between the second limiting step and the third limiting step.

[0013] In the above technical solution, the seal is located between the second limiting step on the outer wall of the pole and the third limiting step on the inner wall of the top cover sheet. The seal can be positioned in the radial direction of the pole to prevent the seal from shifting or falling off, thereby ensuring the sealing effect.

[0014] In some embodiments, the second limiting step includes a first connecting surface and a second connecting surface perpendicular to each other, the third limiting step includes a third connecting surface and a fourth connecting surface perpendicular to each other, the sealing member surrounds the first connecting surface, and the third connecting surface surrounds the sealing member;

[0015] Along the axial direction of the pole, the inner circumference of the seal is pressed between the fourth connecting surface and the second connecting surface.

[0016] In the above technical solution, along the axial direction of the pole, the inner circumference of the seal is pressed between the fourth connection surface and the second connection surface, so that the top cover sheet and the pole are sealed in the axial direction through the inner circumference of the seal.

[0017] In some embodiments, along the axial direction of the pole, the outer periphery of the sealing member is in contact with the first insulating member.

[0018] In the above technical solution, along the axial direction of the pole, the outer periphery of the seal is in contact with the first insulating member, so that the electrolyte is not easily introduced between the outer periphery of the seal and the first insulating member, and the overall structure of the top cover structure is relatively compact.

[0019] In some embodiments, the top cover plate includes a first top surface and a first bottom surface opposite to each other along the axial direction of the pole, and the first bottom surface is concave inward in a direction close to the first top surface to form a limiting groove. The first insulating member includes a second top surface and a second bottom surface opposite to each other along the axial direction of the pole, and the second top surface is convex outward in a direction away from the second bottom surface to form a limiting protrusion, and the limiting protrusion is clamped in the limiting groove.

[0020] In the above technical solution, the limiting protrusion of the first insulating member is clamped in the limiting groove of the top cover sheet, which can make the combination of the top cover sheet and the first insulating member more stable and avoid relative movement between the top cover sheet and the first insulating member in the radial direction.

[0021] In some embodiments, the top cover structure further includes a second insulating member, and the second insulating member is sleeved on the pole;

[0022] Along the radial direction of the pole, the second insulating member is located between the pole and the top cover sheet;

[0023] Along the axial direction of the pole, the second insulating member is located on a side of the top cover sheet away from the sealing member.

[0024] In the above technical solution, along the radial direction of the pole, the second insulating member is located between the pole and the top cover sheet; along the axial direction of the pole, the second insulating member is located on the side of the top cover sheet away from the sealing member. In this way, the second insulating member can separate the top and side of the top cover sheet from the pole, so that the pole and the top cover sheet are insulated, and a short circuit between the pole and the top cover sheet is prevented.

[0025] In some embodiments, the top cover structure further includes a transfer plate, and the bottom of the pole is connected to the transfer plate;

[0026] Along the axial direction of the pole, the adapter plate is located on a side of the first insulating member away from the top cover plate.

[0027] In the above technical solution, along the axial direction of the pole, the adapter plate is located on a side of the first insulating member away from the top cover plate, and the first insulating member can prevent a short circuit between the top cover plate and the adapter plate in the axial direction.

[0028] The energy storage device of the embodiment of the present application includes the top cover structure of any of the above embodiments.

[0029] The electrical equipment of the implementation mode of the present application includes the above-mentioned energy storage device.

[0030] In the top cover structure, energy storage device and electrical equipment of the embodiments of the present application, along the axial direction of the pole, the first insulating member is located between the first limiting step and the sealing member, and the outer peripheral edge of the sealing member overlaps with the positive projection of the first insulating member on the side of the top cover sheet close to the sealing member, which can avoid the seal and the first insulating member from forming a gap in the radial direction of the pole, thereby avoiding the electrolyte from entering the gap and causing conduction between the pole and the top cover sheet to form a short-circuit current loop, thereby reducing the risk of battery cell failure and fire.

[0031] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without creative work. Among them:

[0033] Figure 1 is a schematic diagram of the assembly structure of an energy storage device in certain embodiments of the present application;

[0034] Figure 2 is a schematic diagram of the exploded structure of an energy storage device in certain embodiments of the present application;

[0035] Figure 3 It is a three-dimensional structural schematic diagram of a top cover structure of certain embodiments of the present application from one viewing angle;

[0036] Figure 4 is a schematic diagram of a three-dimensional structure of a top cover structure of certain embodiments of the present application from another perspective;

[0037] Figure 5 yes Figure 3 Schematic diagram of the cross-sectional structure of the top cover structure along line AA;

[0038] Figure 6 yes Figure 5 A schematic diagram of the enlarged structure of part XI;

[0039] Figure 7 is a schematic cross-sectional structure diagram of a top cover structure of certain embodiments of the present application;

[0040] Figure 8 yes Figure 3 Schematic diagram of the exploded structure of the top cover structure;

[0041] Fig. 9 It is a schematic diagram of the structure of electrical equipment in certain embodiments of the present application.

[0042] Description of reference numerals:

[0043] Top cover structure 100, pole 10, first limiting step 11, third top surface 12, third bottom surface 13, second limiting step 14, first connecting surface 141, second connecting surface 142, top cover sheet 20, first top surface 21, first bottom surface 22, limiting groove 221, third limiting step 23, third connecting surface 231, fourth connecting surface 232, sealing component 30, outer periphery 31, inner periphery 32, fourth top surface 33, fourth bottom surface 34, first insulating component 40, second top surface 41, limiting protrusion 411, second bottom surface 42, second insulating component 50, adapter 60, explosion-proof valve 70, energy storage device 200, top patch 201, battery cell 202, wrapping layer 203, battery cell shell 204, electrical equipment 1000. DETAILED DESCRIPTION

[0044] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0045] See also Figure 1 and Figure 2 , an embodiment of the present application provides an energy storage device 200 . The energy storage device 200 may be a battery, a battery pack, a battery module, etc. The energy storage device 200 includes a top cover structure 100 .

[0046] In addition, the energy storage device 200 may also include a top patch 201, a battery cell 202, a wrapping layer 203 and a battery cell shell 204. The battery cell 202 is the core part of the energy storage device 200 and is used to store electrical energy. The top cover structure 100 is arranged on the top of the battery cell 202, and the top patch 201 is arranged on the side of the top cover structure 100 opposite to the battery cell 202. The wrapping layer 203 may be a polyester film. The wrapping layer 203 is used to wrap the battery cell 202 to prevent the battery cell 202 from being subjected to external impact or damage, and also has functions such as insulation and heat dissipation. The battery cell shell 204 may be an aluminum shell. The battery cell shell 204 is sleeved on the outside of the wrapping layer 203.

[0047] See also Figures 3 to 7, an embodiment of the present application provides a top cover structure 100. The top cover structure 100 includes a pole 10, a top cover sheet 20, a seal 30 and a first insulating member 40. The top cover sheet 20, the seal 30 and the first insulating member 40 are all sleeved on the pole 10. The outer wall of the pole 10 bulges outward in a direction away from the central axis of the pole 10 to form a first limiting step 11. Along the axial direction of the pole 10, the seal 30 is located between the top cover sheet 20 and the pole 10. Along the axial direction of the pole 10, the first insulating member 40 is located between the first limiting step 11 and the seal 30, and the outer peripheral edge 31 of the seal 30 partially overlaps with the orthographic projection of the first insulating member 40 on a side of the top cover sheet 20 close to the seal 30. The inner side wall of the first insulating member 40 close to the pole 10 abuts against the vertical surface of the first limiting step 11.

[0048] In the top cover structure 100 of the embodiment of the present application, along the axial direction of the pole 10, the first insulating member 40 is located between the first limiting step 11 and the sealing member 30, and the outer peripheral edge 31 of the sealing member 30 overlaps with the positive projection of the first insulating member 40 on the side of the top cover sheet 20 close to the sealing member 30, which can avoid the seal 30 and the first insulating member 40 from forming a gap in the radial direction of the pole 10, thereby avoiding the electrolyte from entering the gap and causing conduction between the pole 10 and the top cover sheet 20 to form a short-circuit current loop, thereby reducing the risk of battery cell failure and fire.

[0049] Specifically, the top cover structure 100 includes a pole 10 , a top cover sheet 20 , a sealing member 30 and a first insulating member 40 .

[0050] The pole 10 is generally in the shape of a boss, and has an axial direction (eg Figure 7 X-axis direction), radial direction (such as Figure 7 Y axis direction) and the central axis (such as Figure 7 ). The bottom of the pole 10 is connected to the top of the adapter 60, and the bottom of the adapter 60 is connected to the battery cell 202. For example, the bottom of the pole 10 can be welded to the top of the adapter 60, and the bottom of the adapter 60 can be welded to the battery cell 202.

[0051] The top cover sheet 20 is sleeved on the pole 10. The top cover sheet 20 is used to weld with the side of the battery shell 204 to form a complete shell, so that the battery 202 is in a sealed environment. Since the shell needs to have a certain strength and hardness, the top cover sheet 20 can be made of a material with high hardness and strength, such as aluminum or stainless steel. In addition, in order to facilitate welding, the top cover sheet 20 can be made of the same material as the battery shell 204. In one example, the top cover sheet 20 is a plain aluminum sheet. Figure 8, the top cover structure 100 may further include an explosion-proof valve 70. In this case, a mounting hole may be provided in the middle region of the top cover sheet 20, and the explosion-proof valve 70 is installed in the mounting hole. The explosion-proof valve 70 is used to automatically open when the internal pressure of the energy storage device 200 increases abnormally to discharge excess gas, thereby effectively reducing the internal pressure and preventing the energy storage device 200 from exploding due to overpressure.

[0052] The sealing member 30 may be an annular sealing ring, and the sealing member 30 is sleeved on the pole 10. The sealing member 30 may be made of rubber material, such as fluororubber (Fkm) or EPDM (Ethylene Propylene Diene Monomer, Epdm) rubber, etc., to have a better sealing effect.

[0053] The first insulating member 40 is sleeved on the pole 10. The first insulating member 40 can be made of plastic material to have a good insulating effect. The first insulating member 40 can be the lower plastic in the top cover structure 100. The outer wall of the pole 10 bulges outward in a direction away from the central axis of the pole 10 to form a first limiting step 11. The inner wall of the first insulating member 40 close to the pole 10 is supported on the first limiting step 11 and abuts against the vertical surface of the first limiting step 11, so that the first insulating member 40 can be better supported and installed more stably.

[0054] Along the axial direction of the pole 10, the seal 30 is located between the top cover sheet 20 and the pole 10 to seal the gap between the top cover sheet 20 and the pole 10 in the axial direction to prevent the electrolyte from entering and directly connecting the top cover sheet 20 and the pole 10. Along the axial direction of the pole 10, the first insulating member 40 is located between the first limiting step 11 and the seal 30, and the outer peripheral edge 31 of the seal 30 overlaps with the positive projection of the first insulating member 40 on the side of the top cover sheet 20 close to the seal 30 (i.e., the first bottom surface 22 in the following text). In this way, it is possible to avoid the seal 30 and the first insulating member 40 from generating a gap in the radial direction of the pole 10, thereby preventing the electrolyte from entering the gap and causing the pole 10 and the top cover sheet 20 to connect and form a short-circuit current loop, thereby reducing the risk of battery cell failure and fire.

[0055] In the related art, the seal and the first insulating member are located between the top cover and the pole. The seal and the first insulating member are arranged along the radial direction of the pole. There may be a gap at the connection between the seal and the first insulating member in the radial direction. The size of the gap depends on the expansion deformation effect of the seal in the radial direction after compression. This effect is difficult to control, so it is impossible to isolate the gap well. During the assembly and transportation of the battery cell, electrolyte may enter and remain. The entry of electrolyte will cause the dielectric constant between the pole and the top cover to change, thereby causing conduction between the pole and the top cover, forming a short-circuit current loop.

[0056] When the battery pack is not equipped with a fuse for protection, when a short-circuit test is performed or a short circuit actually occurs inside, the positive connecting piece of the battery cell inside the battery pack will be blown due to the short-circuit current (the positive connecting piece is an aluminum piece, and the negative connecting piece is a copper piece. The aluminum piece of the same area has a lower current tolerance capacity and will be blown first). Since there is a gap between the seal and the first insulating piece in the radial direction, electrolyte is likely to remain inside the gap. Therefore, when the positive connecting piece is blown, the current will flow from the negative pole through the electrolyte inside the battery cell through the outer shell, and then through the electrolyte in the top cover gap (i.e. the aforementioned gap) to connect with the positive pole, and a short-circuit current loop will still be formed. The complete short-circuit current loop is the negative pole, the negative connecting piece, the negative pole piece, the electrolyte inside the battery cell, the outer shell, the top cover gap, and the positive pole. Due to the existence of the short-circuit current loop, the high voltage in series inside the battery pack will cause the pole and the top cover piece to break down and conduct, resulting in battery cell failure and fire.

[0057] In the implementation mode of the present application, the structural design between the pole 10, the seal 30 and the first insulating member 40 is optimized, and the gap between the seal 30 and the first insulating member 40 in the radial direction is changed to the first insulating member 40 being located between the first limiting step 11 of the pole 10 and the seal 30 in the axial direction, and the outer peripheral edge 31 of the seal 30 overlaps with the positive projection of the first insulating member 40 on the side of the top cover sheet 20 close to the seal 30, thereby avoiding the formation of a gap between the seal 30 and the first insulating member 40 in the radial direction, and further avoiding the electrolyte from entering the gap to cause conduction between the pole 10 and the top cover sheet 20 to form a short-circuit current loop, thereby reducing the risk of battery cell failure and fire.

[0058] See also Figure 7 In some embodiments, along the axial direction of the pole 10 , the inner peripheral edge 32 of the seal 30 is pressed between the top cover sheet 20 and the pole 10 .

[0059] In this way, along the axial direction of the pole 10, the inner circumference 32 of the seal 30 is pressed between the top cover sheet 20 and the pole 10, so that the inner circumference 32 of the seal 30 can seal the gap between the top cover sheet 20 and the pole 10 to prevent the electrolyte from entering and directly connecting the top cover sheet 20 and the pole 10.

[0060] Among them, when the top cover structure 100 is assembled, the inner circumference 32 of the seal 30 can be compressed to a certain extent along the axial direction of the pole 10, so that the inner circumference 32 of the seal 30 is tightly combined with the top cover sheet 20 and the pole 10 respectively, and has a better sealing effect.

[0061] See also Figure 7In some embodiments, the outer side wall of the pole 10 convexly moves away from the central axis of the pole 10 to form a second limiting step 14. The inner side wall of the top cover sheet 20 concavely moves away from the central axis of the pole 10 to form a third limiting step 23. Along the radial direction of the pole 10, the sealing member 30 is located between the second limiting step 14 and the third limiting step 23.

[0062] In this way, the seal 30 is located between the second limiting step 14 on the outer wall of the pole 10 and the third limiting step 23 on the inner wall of the top cover sheet 20, and the seal 30 can be positioned in the radial direction of the pole 10 to prevent the seal 30 from shifting or falling off, thereby ensuring the sealing effect.

[0063] The convexity of the second limiting step 14 may be smaller than that of the first limiting step 11 , or in other words, the outer diameter of the pole 10 at the second limiting step 14 is smaller than the outer diameter of the pole 10 at the first limiting step 11 .

[0064] In one example, along the radial direction of the pole 10, the inner circumference 32 of the seal 30 may abut against the second limiting step 14, and the outer circumference 31 of the seal 30 may abut against the third limiting step 23, so that the inner circumference 32 of the seal 30 can be closely matched with the outer side wall of the pole 10, and the outer circumference 31 of the seal 30 can be closely matched with the inner side wall of the top cover sheet 20, so as to have a better sealing effect and make the structure compact. Of course, in other examples, along the radial direction of the pole 10, the inner circumference 32 of the seal 30 may have a gap with the second limiting step 14, and the outer circumference 31 of the seal 30 may have a gap with the third limiting step 23, which is not limited here.

[0065] See also Figure 7 In some embodiments, the second limiting step 14 includes a first connecting surface 141 and a second connecting surface 142 that are perpendicular to each other. The third limiting step 23 includes a third connecting surface 231 and a fourth connecting surface 232 that are perpendicular to each other. The seal 30 surrounds the first connecting surface 141, and the third connecting surface 231 surrounds the seal 30. Along the axial direction of the pole 10, the inner peripheral edge 32 of the seal 30 is pressed between the fourth connecting surface 232 and the second connecting surface 142.

[0066] In the above technical solution, along the axial direction of the pole 10 , the inner circumference 32 of the seal 30 is pressed between the fourth connection surface 232 and the second connection surface 142 , so that the top cover sheet 20 and the pole 10 are sealed in the axial direction through the inner circumference 32 of the seal 30 .

[0067] In one example, the pole 10 includes a third top surface 12 and a third bottom surface 13 opposite to each other in the axial direction of the pole 10, and the second connection surface 142 is parallel to the third top surface 12. The top cover sheet 20 includes a first top surface 21 and a first bottom surface 22 opposite to each other in the axial direction of the pole 10, and the fourth connection surface 232 is parallel to the first bottom surface 22. The seal 30 includes a fourth top surface 33 and a fourth bottom surface 34 opposite to each other in the axial direction of the pole 10. The inner periphery 32 of the seal 30 is pressed between the fourth connection surface 232 and the second connection surface 142, so that the area of ​​the fourth top surface 33 corresponding to the inner periphery 32 is sealed with the fourth connection surface 232, and the area of ​​the fourth bottom surface 34 corresponding to the inner periphery 32 is sealed with the second connection surface 142.

[0068] See also Figure 7 In some embodiments, along the axial direction of the pole 10, the outer periphery 31 of the seal 30 is in contact with the first insulating member 40. At this time, the area of ​​the second top surface 41 of the first insulating member 40 corresponding to the outer periphery 31 may be flush with the second connecting surface 142 of the second limiting step 14, and the two are of the same height, so that when the inner periphery 32 of the seal 30 is in contact with the second connecting surface 142, it is convenient for the outer periphery 31 of the seal 30 to be in contact with the first insulating member 40. Of course, in other examples, when the overall thickness distribution of the seal 30 is uneven, the area of ​​the second top surface 41 of the first insulating member 40 corresponding to the outer periphery 31 may not be flush with the second connecting surface 142 of the second limiting step 14, and this is not limited here.

[0069] In the above technical solution, along the axial direction of the pole 10, the outer periphery 31 of the seal 30 is in contact with the first insulating member 40, so that the electrolyte is not easily introduced between the outer periphery 31 of the seal 30 and the first insulating member 40, and the overall structure of the top cover structure 100 is relatively compact.

[0070] Of course, in other examples, there may be a certain gap between the outer peripheral edge 31 of the seal 30 and the first insulating member 40 along the axial direction of the pole 10, which is not limited here. It should be noted that when there is a certain gap between the outer peripheral edge 31 of the seal 30 and the first insulating member 40, if electrolyte enters, the electrolyte needs to flow from the outer peripheral edge 31 of the seal 30 along the gap to the inner side wall (along the inner side wall) of the first insulating member 40. Figure 7 The path is relatively long, so the dielectric constant between the pole 10 and the top cover sheet 20 is less affected, and the pole 10 and the top cover sheet 20 are not turned on to form a short-circuit current loop, thereby reducing the risk of cell failure and fire.

[0071] See also Figure 7In some embodiments, the top cover sheet 20 includes a first top surface 21 and a first bottom surface 22 opposite to each other in the axial direction of the pole 10. The first bottom surface 22 is concave in the direction close to the first top surface 21 to form a limiting groove 221. The first insulating member 40 includes a second top surface 41 and a second bottom surface 42 opposite to each other in the axial direction of the pole 10. The second top surface 41 is convex in the direction away from the second bottom surface 42 to form a limiting protrusion 411. The limiting protrusion 411 is clamped in the limiting groove 221.

[0072] Specifically, the limiting groove 221 may be a full-circle annular groove, and correspondingly, the limiting protrusion 411 is a full-circle annular protrusion. Alternatively, the limiting groove 221 may include a plurality of grooves arranged at circumferential intervals around the pole 10, and the limiting protrusion 411 includes a plurality of protrusions arranged at circumferential intervals around the pole 10. The limiting groove 221 is formed by the first bottom surface 22 of the top cover sheet 20 being concave in the direction close to the first top surface 21. The limiting protrusion 411 is formed by the second top surface 41 of the first insulating member 40 being convex in the direction away from the second bottom surface 42. The limiting protrusion 411 is clamped in the limiting groove 221, which can make the combination of the top cover sheet 20 and the first insulating member 40 more stable, and avoid relative movement of the top cover sheet 20 and the first insulating member 40 in the radial direction.

[0073] See also Figure 7 In some embodiments, the top cover structure 100 further includes a second insulating member 50. The second insulating member 50 is sleeved on the pole 10. Along the radial direction of the pole 10, the second insulating member 50 is located between the pole 10 and the top cover sheet 20. Along the axial direction of the pole 10, the second insulating member 50 is located on the side of the top cover sheet 20 away from the sealing member 30.

[0074] Specifically, the second insulating member 50 may be annular, and the second insulating member 50 is sleeved on the pole 10. The second insulating member 50 may be made of plastic material to have a good insulating effect. That is to say, the second insulating member 50 is the upper plastic in the top cover structure 100. Along the radial direction of the pole 10, the second insulating member 50 is located between the pole 10 and the top cover sheet 20; along the axial direction of the pole 10, the second insulating member 50 is located on the side of the top cover sheet 20 away from the sealing member 30. In this way, the second insulating member 50 can separate the top and side of the top cover sheet 20 from the pole 10, so that the pole 10 and the top cover sheet 20 are insulated to prevent a short circuit between the pole 10 and the top cover sheet 20. The second insulating member 50 can also play a sealing role, and together with the top cover sheet 20 and the battery cell housing 204, the battery cell 202 is placed in a sealed environment.

[0075] See also Figure 7In some embodiments, the top cover structure 100 further includes a transfer plate 60. The bottom of the pole 10 is connected to the transfer plate 60. Along the axial direction of the pole 10, the transfer plate 60 is located on a side of the first insulating member 40 away from the top cover plate 20.

[0076] Specifically, the adapter sheet 60 as a whole can be in the shape of a straight thin sheet. The adapter sheet 60 can be made of a material with certain conductivity and mechanical strength, for example, copper, aluminum or nickel-plated copper. The top of the adapter sheet 60 is connected to the bottom of the pole 10, and the bottom of the adapter sheet 60 is connected to the battery cell 202. Among them, the pole 10, the adapter sheet 60 and the battery cell 202 can be connected by welding to ensure high connection strength and good sealing. For ease of welding, the pole 10 and the adapter sheet 60 can be made of the same material. Along the axial direction of the pole 10, the adapter sheet 60 is located on the side of the first insulating member 40 away from the top cover sheet 20, and the first insulating member 40 can prevent a short circuit between the top cover sheet 20 and the adapter sheet 60 in the axial direction.

[0077] See also Figure 8 It should be noted that, in the embodiment of the present application, the pole 10 can be a positive pole, then correspondingly, the seal 30 is a positive pole seal, the second insulating member 50 is a positive pole insulating member, and the adapter 60 is a positive pole adapter; and / or, the pole 10 can be a negative pole, then correspondingly, the seal 30 is a negative pole seal, the second insulating member 50 is a negative pole insulating member, and the adapter 60 is a negative pole adapter. For the positive electrode region and the negative electrode region, the top cover sheet 20 and the first insulating member 40 are shared. In other words, the optimized design scheme of the top cover structure 100 of the embodiment of the present application can be applied to the improvement of the positive electrode region and / or the improvement of the negative electrode region.

[0078] See also Fig. 9 The embodiment of the present application further provides an electric device 1000. The electric device 1000 includes the above energy storage device 200. The electric device 1000 may be a smart phone, a tablet computer, a laptop computer, an electric car, an electric bicycle, an industrial device, a household device or an energy storage container.

[0079] In the top cover structure 100, the energy storage device 200 and the electrical equipment 1000 of the embodiment of the present application, along the axial direction of the pole 10, the first insulating member 40 is located between the first limiting step 11 and the sealing member 30, and the outer peripheral edge 31 of the sealing member 30 overlaps with the positive projection of the first insulating member 40 on the side of the top cover sheet 20 close to the sealing member 30, which can avoid the seal 30 and the first insulating member 40 from forming a gap in the radial direction of the pole 10, thereby avoiding the electrolyte from entering the gap and causing conduction between the pole 10 and the top cover sheet 20 to form a short-circuit current loop, thereby reducing the risk of battery cell failure and fire.

[0080] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0081] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0082] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0083] The disclosure above provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described above. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides various specific processes and examples of materials, but those of ordinary skill in the art can appreciate the application of other processes and / or the use of other materials.

[0084] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "example", "specific example", "some examples", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0085] Although the embodiments of the present application have been shown and described above, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A top cover structure (100), characterized in that: It comprises a pole (10), a top cover sheet (20), a sealing member (30) and a first insulating member (40), wherein the top cover sheet (20), the sealing member (30) and the first insulating member (40) are all sleeved on the pole (10); The outer side wall of the pole (10) protrudes outward in a direction away from the central axis of the pole (10) to form a first limiting step (11); Along the axial direction of the pole (10), the sealing member (30) is located between the top cover sheet (20) and the pole (10); Along the axial direction of the pole (10), the first insulating member (40) is located between the first limiting step (11) and the sealing member (30), and the outer peripheral edge (31) of the sealing member (30) partially overlaps with the positive projection of the first insulating member (40) on a side of the top cover sheet (20) close to the sealing member (30); the inner side wall of the first insulating member (40) close to the pole (10) abuts against the vertical surface of the first limiting step (11).

2. The top cover structure (100) according to claim 1, characterized in that: Along the axial direction of the pole (10), the inner peripheral edge (32) of the sealing member (30) is pressed between the top cover sheet (20) and the pole (10).

3. The top cover structure (100) according to claim 2, characterized in that: The outer side wall of the pole (10) is convex in a direction away from the central axis of the pole (10) to form a second limiting step (14), and the inner side wall of the top cover sheet (20) is concave in a direction away from the central axis of the pole (10) to form a third limiting step (23); Along the radial direction of the pole (10), the sealing member (30) is located between the second limiting step (14) and the third limiting step (23).

4. The top cover structure (100) according to claim 3, characterized in that: The second limiting step (14) comprises a first connecting surface (141) and a second connecting surface (142) which are perpendicular to each other, the third limiting step (23) comprises a third connecting surface (231) and a fourth connecting surface (232) which are perpendicular to each other, the sealing member (30) surrounds the first connecting surface (141), and the third connecting surface (231) surrounds the sealing member (30); Along the axial direction of the pole (10), the inner peripheral edge (32) of the sealing member (30) is pressed between the fourth connecting surface (232) and the second connecting surface (142).

5. The top cover structure (100) according to claim 1, characterized in that: Along the axial direction of the pole (10), the outer peripheral edge (31) of the sealing member (30) is in contact with the first insulating member (40).

6. The roof structure (100) according to claim 1, characterized in that: The top cover sheet (20) comprises a first top surface (21) and a first bottom surface (22) which are opposite to each other along the axial direction of the pole (10); the first bottom surface (22) is concave inwardly in a direction close to the first top surface (21) to form a limiting groove (221); the first insulating member (40) comprises a second top surface (41) and a second bottom surface (42) which are opposite to each other along the axial direction of the pole (10); the second top surface (41) is convex in a direction away from the second bottom surface (42) to form a limiting protrusion (411); the limiting protrusion (411) is snap-fitted into the limiting groove (221).

7. The roof structure (100) according to claim 1, characterized in that: The top cover structure (100) further comprises a second insulating member (50), wherein the second insulating member (50) is sleeved on the pole (10); Along the radial direction of the pole (10), the second insulating member (50) is located between the pole (10) and the top cover sheet (20); Along the axial direction of the pole (10), the second insulating member (50) is located on a side of the top cover sheet (20) away from the sealing member (30).

8. The roof structure (100) according to claim 1, characterized in that: The top cover structure (100) further comprises an adapter plate (60), and the bottom of the pole (10) is connected to the adapter plate (60); Along the axial direction of the pole (10), the adapter plate (60) is located on a side of the first insulating member (40) away from the top cover plate (20).

9. An energy storage device (200), characterized in that: The invention comprises a top cover structure (100) as claimed in any one of claims 1 to 8.

10. An electrical device (1000), characterized in that: Comprising the energy storage device (200) as claimed in claim 9.

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