Top cover structure, energy storage device and electric equipment

Abstract

The application discloses a top cover structure, an energy storage device and an electric equipment. The top cover structure comprises a pole, a top cover sheet, a sealing element and a first insulating element. The top cover sheet, the sealing element and the first insulating element are sleeved on the pole. The outer side wall of the pole is outwardly convex in a direction away from the central axis of the pole to form a first limiting step. In the axial direction of the pole, the sealing element is located between the top cover sheet and the pole. In the axial direction of the pole, the first insulating element is located between the first limiting step and the sealing element, and the outer periphery of the sealing element overlaps with the normal projection part of the first insulating element on the surface of the top cover sheet close to the sealing element. The inner side wall of the first insulating element close to the pole abuts against the vertical surface of the first limiting step. In this way, the gap between the sealing element and the first insulating element in the radial direction of the pole can be avoided, and the risk of short-circuit current loop formed by the conduction between the pole and the top cover sheet due to the entry of electrolyte into the gap can be reduced, thereby reducing the risk of fire caused by the failure of the battery cell.

Description

Technical Field

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

[0002] A rechargeable battery, also known as a secondary battery or accumulator, is a battery that can be recharged after discharge to reactivate its active materials and continue to be used. Its recyclable nature has made it a primary power source for electrical devices. Rechargeable batteries have also become an important force in promoting energy transition and green development. However, with the increasing demand for rechargeable batteries, they also face some challenges, with battery safety receiving significant attention. Currently, in the top cover design of rechargeable batteries, the sealing ring and lower plastic are located between the aluminum sheet and the electrode post, arranged radially along the electrode post. However, a gap may exist between the assembled sealing ring and the lower plastic in the radial direction. During cell assembly and handling, electrolyte may enter and remain. This electrolyte ingress changes the dielectric constant between the aluminum sheet and the electrode post, potentially causing a short circuit and posing a risk of cell failure and fire. Summary of the Invention

[0003] This application provides a top cover structure, an energy storage device, and an electrical device to solve at least one of the aforementioned technical problems.

[0004] The top cover structure of this application includes an electrode post, a top cover plate, a sealing element, and a first insulating element, wherein the top cover plate, the sealing element, and the first insulating element are all sleeved on the electrode post;

[0005] The outer wall of the pole post protrudes outward in a direction away from the central axis of the pole post to form a first limiting step;

[0006] Along the axial direction of the pole post, the seal is located between the top cover plate and the pole post;

[0007] Along the axial direction of the pole post, the first insulating member is located between the first limiting step and the sealing member, and the outer periphery of the sealing member overlaps with the orthographic projection of the first insulating member on the side of the top cover plate near the sealing member; the inner sidewall of the first insulating member near the pole post abuts against the vertical surface of the first limiting step.

[0008] In the top cover structure of this application embodiment, along the axial direction of the electrode post, the first insulating member is located between the first limiting step and the sealing member, and the outer periphery of the sealing member overlaps with the orthographic projection of the first insulating member on the side of the top cover plate close to the sealing member. This can prevent the sealing member and the first insulating member from generating a gap in the radial direction of the electrode post, thereby preventing the electrolyte from entering the gap and causing the electrode post and the top cover plate to conduct and form a short-circuit current loop, thereby reducing the risk of cell failure and fire.

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

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

[0011] In some embodiments, the outer sidewall of the pole post protrudes outward in a direction away from the central axis of the pole post to form a second limiting step, and the inner sidewall of the top cover plate is recessed in a direction away from the central axis of the pole post to form a third limiting step.

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

[0013] In the above technical solution, the sealing element is located between the second limiting step on the outer side wall of the pole post and the third limiting step on the inner side wall of the top cover plate. The sealing element can be positioned in the radial direction of the pole post to prevent the sealing element 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 that are perpendicular to each other, and the third limiting step includes a third connecting surface and a fourth connecting surface that are perpendicular to each other, the seal surrounds the first connecting surface, and the third connecting surface surrounds the seal.

[0015] Along the axial direction of the pole, the inner periphery 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 post, the inner periphery of the seal is pressed between the fourth connecting surface and the second connecting surface, thereby achieving axial sealing between the top cover plate and the pole post through the inner periphery of the seal.

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

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

[0019] In some embodiments, the top cover includes a first top surface and a first bottom surface opposite to each other along the axial direction of the pole post. The first bottom surface is recessed inward in the 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 post. The second top surface is protruded outward in the direction away from the second bottom surface to form a limiting protrusion. The limiting protrusion is engaged with the limiting groove.

[0020] In the above technical solution, the limiting protrusion of the first insulating member is engaged with the limiting groove of the top cover plate, which makes the combination of the top cover plate and the first insulating member more stable and avoids relative movement between the top cover plate and the first insulating member in the radial direction.

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

[0022] Along the radial direction of the pole post, the second insulating element is located between the pole post and the top cover plate;

[0023] Along the axial direction of the pole post, the second insulating element is located on the side of the top cover plate away from the seal.

[0024] In the above technical solution, the second insulating element is located between the pole and the top cover plate along the radial direction of the pole; and along the axial direction of the pole, the second insulating element is located on the side of the top cover plate away from the sealing element. Thus, the second insulating element can separate the top and sides of the top cover plate from the pole, thereby insulating the pole and the top cover plate and preventing a short circuit between them.

[0025] In some embodiments, the top cover structure further includes an adapter piece, to which the bottom of the pole is connected;

[0026] Along the axial direction of the pole, the adapter piece is located on the side of the first insulator away from the top cover piece.

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

[0028] The energy storage device according to the embodiments of this application includes the top cover structure of any of the above embodiments.

[0029] The electrical equipment described in this application includes the energy storage device described above.

[0030] In the top cover structure, energy storage device, and electrical equipment of this application embodiment, along the axial direction of the electrode post, the first insulating member is located between the first limiting step and the sealing member, and the outer periphery of the sealing member overlaps with the orthographic projection of the first insulating member on the side of the top cover plate near the sealing member. This can prevent the sealing member and the first insulating member from generating a gap in the radial direction of the electrode post, thereby preventing the electrolyte from entering the gap and causing the electrode post and the top cover plate to conduct and form a short-circuit current loop, thereby reducing the risk of cell failure and fire.

[0031] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort. Among them:

[0033] Figure 1 This is a schematic diagram of the assembly structure of an energy storage device according to certain embodiments of this application;

[0034] Figure 2 This is an exploded structural diagram of an energy storage device according to certain embodiments of this application;

[0035] Figure 3 This is a three-dimensional structural schematic diagram of the top cover structure from one perspective of certain embodiments of this application;

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

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

[0038] Figure 6 yes Figure 5 A magnified structural diagram of section XI;

[0039] Figure 7 This is a cross-sectional structural diagram of the top cover structure according to certain embodiments of this application;

[0040] Figure 8 yes Figure 3 An exploded view of the top cover structure;

[0041] Figure 9 This is a schematic diagram of the structure of an electrical device according to certain embodiments of this application.

[0042] Explanation of reference numerals in the attached figures:

[0043] Top cover structure 100, pole post 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 piece 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 element 30, outer perimeter 31, inner perimeter 32, fourth top surface 33, fourth bottom surface 34, first insulating element 40, second top surface 41, limiting protrusion 411, second bottom surface 42, second insulating element 50, adapter piece 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 Implementation

[0044] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0045] Please see Figure 1 and Figure 2 This application provides an energy storage device 200. The energy storage device 200 can 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 sheathing layer 203, and a battery cell housing 204. The battery cell 202, as the core component of the energy storage device 200, is used to store electrical energy. A top cover structure 100 is disposed on the top of the battery cell 202, and the top patch 201 is disposed on the side of the top cover structure 100 opposite to the battery cell 202. The sheathing layer 203 can be a polyester film. The sheathing layer 203 is used to wrap the battery cell 202, preventing the battery cell 202 from being subjected to external impacts or damage, and also has functions such as insulation and heat dissipation. The battery cell housing 204 can be an aluminum shell. The battery cell housing 204 is fitted over the sheathing layer 203.

[0047] Please see Figures 3 to 7This application provides a top cover structure 100. The top cover structure 100 includes a pole post 10, a top cover plate 20, a sealing member 30, and a first insulating member 40. The top cover plate 20, the sealing member 30, and the first insulating member 40 are all sleeved on the pole post 10. The outer side wall of the pole post 10 protrudes outward in a direction away from the central axis of the pole post 10 to form a first limiting step 11. Along the axial direction of the pole post 10, the sealing member 30 is located between the top cover plate 20 and the pole post 10. Along the axial direction of the pole post 10, the first insulating member 40 is located between the first limiting step 11 and the sealing member 30, and the outer periphery 31 of the sealing member 30 overlaps with the orthographic projection portion of the first insulating member 40 on the side of the top cover plate 20 near the sealing member 30. The inner side wall of the first insulating member 40 near the pole post 10 abuts against the vertical surface of the first limiting step 11.

[0048] In the top cover structure 100 of this application embodiment, along the axial direction of the pole post 10, the first insulating member 40 is located between the first limiting step 11 and the sealing member 30, and the outer periphery 31 of the sealing member 30 overlaps with the orthographic projection of the first insulating member 40 on the side of the top cover plate 20 near the sealing member 30. This can prevent the sealing member 30 and the first insulating member 40 from generating a gap in the radial direction of the pole post 10, thereby preventing the electrolyte from entering the gap and causing the pole post 10 and the top cover plate 20 to conduct and form a short-circuit current loop, thereby reducing the risk of cell failure and fire.

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

[0050] The pole post 10 is generally shaped like a boss, and the pole post 10 has an axial direction (such as...). Figure 7 (X-axis direction), radial direction (e.g.) Figure 7 (in the Y-axis direction) and the central axis (e.g.) Figure 7 (As shown in O). The bottom of the terminal 10 is connected to the top of the adapter piece 60, and the bottom of the adapter piece 60 is connected to the battery cell 202. For example, the bottom of the terminal 10 can be soldered to the top of the adapter piece 60, and the bottom of the adapter piece 60 can be soldered to the battery cell 202.

[0051] The top cover plate 20 is fitted onto the electrode post 10. The top cover plate 20 is used for welding to the side of the cell housing 204 to form a complete housing, thus placing the cell 202 within a sealed environment. Since the housing needs to have a certain strength and hardness, the top cover plate 20 can be made of a high-hardness and high-strength material, such as aluminum or stainless steel. Furthermore, for ease of welding, the top cover plate 20 can be made of the same material as the cell housing 204. In one example, the top cover plate 20 is a plain aluminum sheet. Please refer to... Figure 8The top cover structure 100 may also include an explosion-proof valve 70. In this case, a mounting hole may be provided in the central area of ​​the top cover plate 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 rises abnormally, so as to discharge excess gas, thereby effectively reducing the internal pressure and preventing the energy storage device 200 from exploding due to overpressure.

[0052] The seal 30 can be an annular sealing ring, and the seal 30 is sleeved on the pole post 10. The seal 30 can be made of rubber, such as fluororubber (Fkm) or ethylene propylene diene monomer (EPDM) rubber, to achieve a better sealing effect.

[0053] The first insulating element 40 is sleeved on the pole post 10. The first insulating element 40 can be made of plastic to provide good insulation. The first insulating element 40 can be the lower plastic in the top cover structure 100. The outer side wall of the pole post 10 protrudes outward in a direction away from the central axis of the pole post 10 to form a first limiting step 11. The inner side wall of the first insulating element 40 near the pole post 10 is supported by the first limiting step 11 and abuts against the vertical surface of the first limiting step 11, so that the first insulating element 40 can be well supported and the installation is more stable.

[0054] Along the axial direction of the electrode post 10, the sealing member 30 is located between the top cover plate 20 and the electrode post 10 to seal the gap between the top cover plate 20 and the electrode post 10 in the axial direction, preventing electrolyte from entering and directly connecting the top cover plate 20 and the electrode post 10. Along the axial direction of the electrode post 10, the first insulating member 40 is located between the first limiting step 11 and the sealing member 30, and the outer periphery 31 of the sealing member 30 overlaps with the orthographic projection of the first insulating member 40 on the side of the top cover plate 20 near the sealing member 30 (i.e., the first bottom surface 22 mentioned later). In this way, a gap can be avoided between the sealing member 30 and the first insulating member 40 in the radial direction of the electrode post 10, thereby preventing electrolyte from entering the gap and causing the electrode post 10 and the top cover plate 20 to conduct and form a short-circuit current loop, thus reducing the risk of cell failure and fire.

[0055] In related technologies, the seal and the first insulator are located between the top cover plate and the electrode post. The seal and the first insulator are arranged along the radial direction of the electrode post. A gap may exist at the connection point between the seal and the first insulator in the radial direction. The size of the gap depends on the expansion and deformation effect of the seal in the radial direction after compression. This effect is difficult to control, thus making it impossible to effectively isolate this gap. During the cell assembly and handling process, electrolyte may enter and remain. The entry of electrolyte will cause a change in the dielectric constant between the electrode post and the top cover plate, thereby making the electrode post and the top cover plate conductive and forming a short-circuit current loop.

[0056] When the battery pack lacks internal fuse protection, a short-circuit test or an actual internal short circuit will cause the positive electrode connector of the battery cell to melt due to the short-circuit current (the positive electrode connector is made of aluminum, and the negative electrode connector is made of copper; aluminum, with the same area, has a lower current tolerance and will melt first). Because there is a radial gap between the seal and the first insulating component, electrolyte can easily remain inside this gap. Therefore, when the positive electrode connector melts, current will flow from the negative terminal through the electrolyte inside the cell, through the casing, and then through the electrolyte in the top cover gap (the aforementioned gap) to connect with the positive terminal, forming a short-circuit current loop. The complete short-circuit current loop is as follows: negative terminal, negative electrode connector, negative electrode plate, electrolyte inside the cell, casing, top cover gap, positive terminal. Due to the existence of this short-circuit current loop, the high voltage connected in series inside the battery pack can cause the terminal and top cover to break down and conduct, leading to cell failure and fire.

[0057] In this embodiment, the structural design between the electrode post 10, the seal 30, and the first insulating member 40 is optimized. Instead of a gap between the seal 30 and the first insulating member 40 in the radial direction, the first insulating member 40 is located between the first limiting step 11 of the electrode post 10 and the seal 30 in the axial direction. The outer periphery 31 of the seal 30 and the projection of the first insulating member 40 onto the side of the top cover plate 20 near the seal 30 overlap, thus avoiding a gap between the seal 30 and the first insulating member 40 in the radial direction. This prevents electrolyte from entering the gap and causing a short circuit current loop between the electrode post 10 and the top cover plate 20, thereby reducing the risk of cell failure and fire.

[0058] Please see Figure 7 In some embodiments, along the axial direction of the pole post 10, the inner periphery 32 of the seal 30 is pressed between the top cover plate 20 and the pole post 10.

[0059] Thus, along the axial direction of the electrode post 10, the inner periphery 32 of the sealing element 30 is pressed between the top cover plate 20 and the electrode post 10, so that the inner periphery 32 of the sealing element 30 can seal the gap between the top cover plate 20 and the electrode post 10, preventing electrolyte from entering and directly connecting the top cover plate 20 and the electrode post 10.

[0060] When the top cover structure 100 is assembled, the inner periphery 32 of the seal 30 can have a certain amount of compression along the axial direction of the pole post 10, so that the inner periphery 32 of the seal 30 is tightly combined with the top cover plate 20 and the pole post 10 respectively, and has a good sealing effect.

[0061] Please see Figure 7In some embodiments, the outer sidewall of the pole post 10 protrudes outward in a direction away from the central axis of the pole post 10 to form a second limiting step 14. The inner sidewall of the top cover plate 20 is recessed in a direction away from the central axis of the pole post 10 to form a third limiting step 23. Along the radial direction of the pole post 10, the seal 30 is located between the second limiting step 14 and the third limiting step 23.

[0062] Thus, the seal 30 is located between the second limiting step 14 on the outer side wall of the pole post 10 and the third limiting step 23 on the inner side wall of the top cover plate 20, which can position the seal 30 in the radial direction of the pole post 10, preventing the seal 30 from shifting or falling off, thereby ensuring the sealing effect.

[0063] The degree of protrusion of the second limiting step 14 can be less than the degree of protrusion of the first limiting step 11, or in other words, the outer diameter of the pole post 10 at the second limiting step 14 is less than the outer diameter of the pole post 10 at the first limiting step 11.

[0064] In one example, along the radial direction of the pole post 10, the inner periphery 32 of the seal 30 can abut against the second limiting step 14, and the outer periphery 31 of the seal 30 can abut against the third limiting step 23, so that the inner periphery 32 of the seal 30 can fit tightly against the outer wall of the pole post 10, and the outer periphery 31 of the seal 30 can fit tightly against the inner wall of the top cover plate 20, so as to achieve a better sealing effect and make the structure compact. Of course, in other examples, along the radial direction of the pole post 10, there may be a gap between the inner periphery 32 of the seal 30 and the second limiting step 14, and a gap between the outer periphery 31 of the seal 30 and the third limiting step 23, which is not limited here.

[0065] Please see 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 post 10, the inner periphery 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 post 10, the inner periphery 32 of the sealing member 30 is pressed between the fourth connecting surface 232 and the second connecting surface 142, thereby achieving the sealing of the top cover plate 20 and the pole post 10 in the axial direction through the inner periphery 32 of the sealing member 30.

[0067] In one example, the pole post 10 includes a third top surface 12 and a third bottom surface 13 facing away from each other along the axial direction of the pole post 10, and a second connecting surface 142 parallel to the third top surface 12. The top cover plate 20 includes a first top surface 21 and a first bottom surface 22 facing away from each other along the axial direction of the pole post 10, and a fourth connecting surface 232 parallel to the first bottom surface 22. The seal 30 includes a fourth top surface 33 and a fourth bottom surface 34 facing away from each other along the axial direction of the pole post 10. The inner periphery 32 of the seal 30 is pressed between the fourth connecting surface 232 and the second connecting surface 142, such that the area of ​​the fourth top surface 33 corresponding to the inner periphery 32 seals with the fourth connecting surface 232, and the area of ​​the fourth bottom surface 34 corresponding to the inner periphery 32 seals with the second connecting surface 142.

[0068] Please see Figure 7 In some embodiments, along the axial direction of the pole post 10, the outer periphery 31 of the sealing member 30 is in contact with the first insulating member 40. In this case, the area corresponding to the outer periphery 31 of the second top surface 41 of the first insulating member 40 can be flush with the second connecting surface 142 of the second limiting step 14, with both having the same height. This facilitates the contact between the outer periphery 31 of the sealing member 30 and the first insulating member 40 when the inner periphery 32 of the sealing member 30 is in contact with the second connecting surface 142. Of course, in other examples, when the overall thickness distribution of the sealing member 30 is uneven, the area corresponding to the outer periphery 31 of the second top surface 41 of the first insulating member 40 may not be flush with the second connecting surface 142 of the second limiting step 14; this is not a limitation.

[0069] In the above technical solution, along the axial direction of the pole post 10, the outer periphery 31 of the sealing member 30 is in contact with the first insulating member 40, so that electrolyte does not easily enter between the outer periphery 31 of the sealing member 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, a certain gap may also exist between the outer periphery 31 of the seal 30 and the first insulating member 40 along the axial direction of the pole post 10, which is not limited here. It should be noted that when there is a certain gap between the outer periphery 31 of the seal 30 and the first insulating member 40, if electrolyte enters, the electrolyte needs to travel from the outer periphery 31 of the seal 30 along the gap to the inner wall of the first insulating member 40 (along the...). Figure 7 The path is relatively long (moving in the Y direction), so it has little impact on the dielectric constant between the terminal 10 and the top cover plate 20. It will not cause the terminal 10 and the top cover plate 20 to conduct and form a short-circuit current loop, thus reducing the risk of cell failure and fire.

[0071] Please see Figure 7In some embodiments, the top cover 20 includes a first top surface 21 and a first bottom surface 22 opposite to each other along the axial direction of the pole post 10. The first bottom surface 22 is recessed inward toward 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 along the axial direction of the pole post 10. The second top surface 41 protrudes outward in a direction away from the second bottom surface 42 to form a limiting protrusion 411. The limiting protrusion 411 engages with the limiting groove 221.

[0072] Specifically, the limiting groove 221 can be a complete annular groove, and correspondingly, the limiting protrusion 411 can be a complete annular protrusion. Alternatively, the limiting groove 221 can include multiple grooves circumferentially spaced around the pole post 10, and the limiting protrusion 411 can include multiple protrusions circumferentially spaced around the pole post 10. The limiting groove 221 is formed by the first bottom surface 22 of the top cover plate 20 recessed inward toward the first top surface 21. The limiting protrusion 411 is formed by the second top surface 41 of the first insulating member 40 protruding outward away from the second bottom surface 42. The limiting protrusion 411 engages with the limiting groove 221, which makes the combination of the top cover plate 20 and the first insulating member 40 more stable and prevents relative movement between the top cover plate 20 and the first insulating member 40 in the radial direction.

[0073] Please see 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 post 10. Along the radial direction of the pole post 10, the second insulating member 50 is located between the pole post 10 and the top cover plate 20. Along the axial direction of the pole post 10, the second insulating member 50 is located on the side of the top cover plate 20 away from the seal 30.

[0074] Specifically, the second insulating element 50 can be annular and is sleeved on the pole post 10. The second insulating element 50 can be made of plastic to provide good insulation. That is, the second insulating element 50 is the upper plastic in the top cover structure 100. Along the radial direction of the pole post 10, the second insulating element 50 is located between the pole post 10 and the top cover plate 20; along the axial direction of the pole post 10, the second insulating element 50 is located on the side of the top cover plate 20 away from the sealing element 30. In this way, the second insulating element 50 can separate the top and sides of the top cover plate 20 from the pole post 10, thereby insulating the pole post 10 from the top cover plate 20 and preventing short circuits between the pole post 10 and the top cover plate 20. The second insulating element 50 also serves as a seal, together with the top cover plate 20 and the cell housing 204, keeping the cell 202 in a sealed environment.

[0075] Please see Figure 7In some embodiments, the top cover structure 100 further includes an adapter piece 60. The bottom of the pole 10 is connected to the adapter piece 60. Along the axial direction of the pole 10, the adapter piece 60 is located on the side of the first insulator 40 away from the top cover piece 20.

[0076] Specifically, the adapter piece 60 can be a flat, thin sheet. The adapter piece 60 can be made of a material with certain conductivity and mechanical strength, such as copper, aluminum, or nickel-plated copper. The top of the adapter piece 60 is connected to the bottom of the terminal post 10, and the bottom of the adapter piece 60 is connected to the battery cell 202. The terminal post 10, the adapter piece 60, and the battery cell 202 can be connected by welding to achieve high connection strength and good sealing. To facilitate welding, the terminal post 10 and the adapter piece 60 can be made of the same material. Along the axial direction of the terminal post 10, the adapter piece 60 is located on the side of the first insulating member 40 away from the top cover plate 20, and the first insulating member 40 can prevent short circuits between the top cover plate 20 and the adapter piece 60 in the axial direction.

[0077] Please see Figure 8 It should be noted that, in the embodiments of this application, the pole 10 can be a positive pole, in which case the sealing element 30 is a positive sealing element, the second insulating element 50 is a positive insulating element, and the adapter piece 60 is a positive adapter piece; and / or, the pole 10 can be a negative pole, in which case the sealing element 30 is a negative sealing element, the second insulating element 50 is a negative insulating element, and the adapter piece 60 is a negative adapter piece. For both the positive and negative pole regions, the top cover piece 20 and the first insulating element 40 are shared. That is to say, the optimized design of the top cover structure 100 in the embodiments of this application can be applied to improvements in the positive pole region and / or the negative pole region.

[0078] Please see Figure 9 This application also provides an electrical appliance 1000. The electrical appliance 1000 includes the aforementioned energy storage device 200. The electrical appliance 1000 can be a smartphone, tablet computer, laptop computer, electric vehicle, electric bicycle, industrial equipment, household appliance, or energy storage container, etc.

[0079] In the top cover structure 100, energy storage device 200, and electrical equipment 1000 of this application embodiment, along the axial direction of the pole post 10, the first insulating member 40 is located between the first limiting step 11 and the sealing member 30, and the outer periphery 31 of the sealing member 30 overlaps with the orthographic projection of the first insulating member 40 on the side of the top cover plate 20 near the sealing member 30. This can prevent the sealing member 30 and the first insulating member 40 from generating a gap in the radial direction of the pole post 10, thereby preventing the electrolyte from entering the gap and causing the pole post 10 and the top cover plate 20 to conduct and form a short-circuit current loop, thereby reducing the risk of cell failure and fire.

[0080] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0081] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0082] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0083] The foregoing disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described above. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0084] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," and "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with an embodiment or example that are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

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

Claims

1. A top cover structure (100), characterized in that, It includes a pole post (10), a top cover plate (20), a sealing element (30), and a first insulating element (40), wherein the top cover plate (20), the sealing element (30), and the first insulating element (40) are all sleeved on the pole post (10); The outer wall of the pole post (10) protrudes outward in a direction away from the central axis of the pole post (10) to form a first limiting step (11). Along the axial direction of the pole post (10), the seal (30) is located between the top cover plate (20) and the pole post (10); Along the axial direction of the pole post (10), the first insulating member (40) is located between the first limiting step (11) and the sealing member (30), and the outer periphery (31) of the sealing member (30) overlaps with the orthographic projection of the first insulating member (40) on the side of the top cover plate (20) near the sealing member (30); the inner sidewall of the first insulating member (40) near the pole post (10) abuts against the vertical surface of the first limiting step (11); the upper surface of the end of the first insulating member (40) away from the pole post (10) abuts against the top cover plate (20); In the axial direction of the pole post (10), the inner periphery (32) of the sealing element (30) has a certain amount of compression so that the inner periphery (32) of the sealing element (30) is tightly combined with the top cover plate (20) and the pole post (10) respectively. The top cover structure (100) also includes a second insulating member (50), which is sleeved on the pole post (10). The second insulating member (50) is used to separate the top and sides of the top cover plate (20) from the pole post (10).

2. The top cover structure (100) according to claim 1, characterized in that, Along the axial direction of the pole post (10), the inner periphery (32) of the seal (30) is pressed between the top cover plate (20) and the pole post (10).

3. The top cover structure (100) according to claim 2, characterized in that, The outer sidewall of the pole post (10) protrudes outward in a direction away from the central axis of the pole post (10) to form a second limiting step (14), and the inner sidewall of the top cover plate (20) is recessed in a direction away from the central axis of the pole post (10) to form a third limiting step (23). Along the radial direction of the pole (10), the seal (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) 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 periphery (32) of the seal (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 periphery (31) of the seal (30) is in contact with the first insulating member (40).

6. The top cover structure (100) according to claim 1, characterized in that, The top cover (20) includes a first top surface (21) and a first bottom surface (22) opposite to each other along the axial direction of the pole post (10). The first bottom surface (22) is recessed inward toward 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 along the axial direction of the pole post (10). The second top surface (41) is protruded outward away from the second bottom surface (42) to form a limiting protrusion (411). The limiting protrusion (411) is engaged with the limiting groove (221).

7. The top cover structure (100) according to claim 1, characterized in that, Along the radial direction of the pole post (10), the second insulating member (50) is located between the pole post (10) and the top cover plate (20); Along the axial direction of the pole post (10), the second insulating member (50) is located on the side of the top cover plate (20) away from the seal (30).

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

9. An energy storage device (200), characterized in that, Includes the top cover structure (100) as described in any one of claims 1-8.

10. An electrical appliance (1000), characterized in that, Includes the energy storage device (200) as described in claim 9.

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