Top cover structure, battery cell assembly, battery and electric equipment

Abstract

The utility model discloses a top cover structure, a battery cell assembly, a battery and electric equipment. The top cover structure of the embodiment of the utility model comprises a pole, an anti-explosion valve and a top cover plate. The pole is provided with a through hole penetrating through the first connecting part and the second connecting part in the thickness direction, the through hole comprises a first hole section and a second hole section which are communicated, the first hole section is close to the first connecting part, and the second hole section is close to the second connecting part. The anti-explosion valve is connected with the inner wall of the through hole and located at the joint of the first hole section and the second hole section, and a notch communicated with the first hole section is formed in the side face of the first connecting part. Thus, the explosion-proof valve does not need to be made of high-hardness and high-strength materials, the nick residual thickness of the explosion-proof valve can be set in a normal range, the problem that the manufacturing process of the explosion-proof valve is difficult is solved, and the explosion-proof valve is not prone to being broken through; in addition, due to the notch in the side face of the first connecting part, gas rushing out of the anti-explosion valve can be exhausted in time.

Description

Technical Field

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

[0002] A secondary battery (rechargeable battery), also known as a rechargeable battery or storage battery, refers to a battery that can be recharged to activate the active material and continue to be used after the battery is discharged. The recyclable nature of secondary batteries has made them gradually become the main power source for electrical equipment. As the demand for secondary batteries gradually increases, people have higher requirements for their reliability. At present, the explosion-proof valve in the secondary battery is set on the top cover plate. In order to ensure the normal welding of the explosion-proof valve and the top cover plate, the material of the explosion-proof valve and the top cover plate must be consistent, and the process requirements for the explosion-proof valve are extremely high. Utility Model Content

[0003] The embodiments of the present application provide a top cover structure, a battery cell assembly, a battery 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 includes a pole, an explosion-proof valve and a top cover plate;

[0005] The top cover plate has a first surface and a second surface opposite to each other in a thickness direction, and a mounting hole penetrating through the first surface and the second surface is provided on the top cover plate;

[0006] The pole has a first connection portion and a second connection portion connected along the thickness direction, the first connection portion is located on the side of the first surface of the top cover plate, and the second connection portion is penetrated through the mounting hole. The pole is provided with a through hole penetrating the first connection portion and the second connection portion along the thickness direction, and the through hole includes a first hole segment and a second hole segment that are connected, the first hole segment is close to the first connection portion, and the second hole segment is close to the second connection portion. The explosion-proof valve is connected to the inner wall of the through hole and is located at the connection between the first hole segment and the second hole segment, and a notch connected to the first hole segment is provided on the side of the first connection portion.

[0007] In the top cover structure of the embodiment of the present application, the explosion-proof valve is connected to the inner wall of the through hole of the pole and is located at the connection between the first hole section and the second hole section, and a notch connected to the first hole section is provided on the side of the first connecting portion of the pole. In this way, the explosion-proof valve does not need to use a material with high hardness and high strength, and the residual thickness of the notch of the explosion-proof valve can be set within a normal range, solving the problem of the difficulty of the explosion-proof valve manufacturing process, and the explosion-proof valve is not easy to be broken; in addition, the notch on the side of the first connecting portion allows the gas rushing out of the explosion-proof valve to be discharged in time.

[0008] In some embodiments, the pole is made of the same material as the explosion-proof valve.

[0009] In the above technical solution, the pole and the explosion-proof valve are made of the same material, and the pole material may have lower hardness and strength than the top cover plate material, thus solving the problem of the explosion-proof valve manufacturing process difficulties and making the explosion-proof valve less likely to be broken.

[0010] In some embodiments, there are multiple notches, and the multiple notches are evenly distributed along the circumference of the first connecting portion.

[0011] In this way, the gas at each position in the interval space between the explosion-proof valve and the connecting piece can be discharged quickly, thereby improving the exhaust efficiency.

[0012] In certain embodiments, a first limiting step is formed on the inner wall of the through hole, and the explosion-proof valve is supported on the first limiting step.

[0013] In this way, when the explosion-proof valve is welded to the inner wall of the through hole, the first limiting step can limit the position of the explosion-proof valve on the inner wall of the through hole.

[0014] In some embodiments, the top cover structure further includes a protective sheet, which is connected to the inner wall of the through hole and is located at the connection between the first hole segment and the second hole segment, and the protective sheet is arranged on a side of the explosion-proof valve close to the first connecting portion.

[0015] In this way, the protection sheet can protect the explosion-proof valve. When the explosion-proof valve automatically opens to the side away from the second connecting portion, the protection sheet can be opened together with the explosion-proof valve.

[0016] In some embodiments, a second limiting step is formed on the inner wall of the through hole, and the protection sheet is carried on the second limiting step.

[0017] In this way, when the protection sheet is bonded to the inner wall of the through hole, the second limiting step can limit the position of the protection sheet on the inner wall of the through hole.

[0018] In certain embodiments, the outer diameter of the protection sheet is larger than the outer diameter of the explosion-proof valve, and the aperture of the through hole at the second limiting step is larger than the aperture of the through hole at the first limiting step.

[0019] In this way, the protection sheet can cover the explosion-proof valve in the axial direction of the pole to better protect the explosion-proof valve.

[0020] In some embodiments, the top cover structure further includes a pressure ring, which is arranged around the second connecting portion and is located on a side of the top cover plate where the second surface is located.

[0021] In the above technical solution, the pressure ring is located on the side of the second insulating member opposite to the top cover plate, and along the axial direction of the pole, the first insulating member, the top cover plate and the second insulating member are sequentially arranged around the pole. In this way, the pressure ring can limit the position of the top cover plate in the axial direction of the pole.

[0022] In some embodiments, the top cover structure further includes a first insulating member, and the first insulating member is disposed around the first connecting portion and the second connecting portion;

[0023] Along the axial direction of the pole, the first insulating member is located between the first connecting portion and the top cover plate;

[0024] Along the radial direction of the pole, the first insulating member is located between the second connecting portion and the top cover plate.

[0025] In the above technical solution, along the axial direction of the pole, the first insulating member isolates the first connection part and the top cover plate. Along the radial direction of the pole, the first insulating member isolates the second connection part and the top cover plate. In this way, the top cover plate is insulated from the first connection part and the second connection part respectively, preventing a short circuit between the top cover plate and the pole.

[0026] In some embodiments, the top cover structure further includes a second insulating member, and the second insulating member is disposed around the second connecting portion;

[0027] Along the axial direction of the pole, the second insulating member is located between the top cover plate and the pressure ring;

[0028] Along the radial direction of the pole, the second insulating member is located between the second connecting portion and the top cover plate.

[0029] In the above technical solution, along the axial direction of the pole, the second insulating member isolates the top cover plate and the pressure ring. Along the radial direction of the pole, the second insulating member isolates the second connecting portion and the top cover plate. In this way, the top cover plate is insulated from the second connecting portion and the pressure ring, respectively, to prevent short circuits between the top cover plate and the pole, and between the top cover plate and the pressure ring.

[0030] In some embodiments, the top cover structure further includes a sealing member, and the sealing member is disposed around the second connecting portion;

[0031] Along the axial direction of the pole, the sealing member is located between the top cover plate and the pressure ring;

[0032] Along the radial direction of the pole, the sealing member is located between the second connecting portion and the top cover plate.

[0033] In the above technical solution, on the one hand, the seal can insulate the top cover plate from the second connection part, and between the top cover plate and the pressure ring; on the other hand, the seal can play a sealing role, together with the top cover plate and the side of the shell outside the battery cell, to place the battery cell in a sealed environment.

[0034] The battery cell assembly of the embodiment of the present application includes:

[0035] The top cover structure of any of the above embodiments; and

[0036] The through hole corresponds to the position of the central hole of the battery cell.

[0037] The battery according to the embodiment of the present application includes the above-mentioned battery cell assembly.

[0038] The electrical equipment according to the embodiment of the present application includes the above-mentioned battery.

[0039] In the top cover structure, battery cell assembly, battery and electrical equipment of the embodiment of the present application, the explosion-proof valve is connected to the inner wall of the through hole of the pole and is located at the connection between the first hole section and the second hole section, and a notch connected to the first hole section is provided on the side of the first connection part of the pole. In this way, the explosion-proof valve does not need to use high-hardness and high-strength materials, and the residual thickness of the notch of the explosion-proof valve can be set within a normal range, which solves the problem of difficult manufacturing process of the explosion-proof valve, and the explosion-proof valve is not easy to be broken; in addition, the notch on the side of the first connection part allows the gas rushing out of the explosion-proof valve to be discharged in time.

[0040] 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

[0041] 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:

[0042] Figure 1 It is a schematic diagram of the structure of the connection between the top cover structure and the connecting piece in some embodiments of the present application;

[0043] Figure 2 is a schematic diagram of the assembly structure of the top cover structure of certain embodiments of the present application;

[0044] Figure 3 is a schematic diagram of the exploded structure of the top cover structure of certain embodiments of the present application;

[0045] Figure 4 is a schematic cross-sectional structural diagram of a top cover structure of certain embodiments of the present application;

[0046] Figure 5 is a schematic diagram of a module of a battery cell assembly according to certain embodiments of the present application;

[0047] Figure 6 is a schematic diagram of a module of a battery according to some embodiments of the present application;

[0048] Figure 7 It is a module schematic diagram of an electrical equipment in certain embodiments of the present application.

[0049] Description of reference numerals:

[0050] Top cover structure 100, pole 10, first connecting part 11, first limiting step 111, second limiting step 112, side 113, top wall 114, second connecting part 12, notch 13, through hole 14, first hole section 141, second hole section 142, explosion-proof valve 20, protective sheet 30, top cover plate 40, first surface 41, second surface 42, mounting hole 43, pressure ring 50, first insulating member 60, second insulating member 70, sealing member 80, battery cell 200, battery cell assembly 300, connecting sheet 310, opening 311, battery 400, electrical equipment 1000. DETAILED DESCRIPTION

[0051] 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.

[0052] See also Figures 1 to 5, the embodiment of the present application provides a top cover structure 100. The top cover structure 100 includes a pole 10, an explosion-proof valve 20 and a top cover plate 40. The top cover plate 40 has a first surface 41 and a second surface 42 opposite to each other in the thickness direction, and a mounting hole 43 penetrating the first surface 41 and the second surface 42 is provided on the top cover plate 40. The pole 10 has a first connecting portion 11 and a second connecting portion 12 connected in the thickness direction, the first connecting portion 11 is located on the side where the first surface 41 of the top cover plate 40 is located, and the second connecting portion 12 is penetrated in the mounting hole 43. The pole 10 is provided with a through hole 14 penetrating the first connecting portion 11 and the second connecting portion 12 in the thickness direction, and the through hole 14 includes a first hole section 141 and a second hole section 142 connected, the first hole section 141 is close to the first connecting portion 11, and the second hole section 142 is close to the second connecting portion 12. The explosion-proof valve 20 is connected to the inner wall of the through hole 14 and is located at the connection between the first hole section 141 and the second hole section 142. A notch 13 communicating with the first hole section 141 is formed on the side surface 113 of the first connecting portion 11 .

[0053] In the top cover structure 100 of the embodiment of the present application, the explosion-proof valve 20 is connected to the inner wall of the through hole 14 of the pole 10 and is located at the connection between the first hole section 141 and the second hole section 142. The side surface 113 of the first connecting portion 11 of the pole 10 is provided with a notch 13 connected to the first hole section 141. In this way, the explosion-proof valve 20 does not need to use a material with high hardness and high strength, and the residual thickness of the notch of the explosion-proof valve 20 can be set within a normal range, which solves the problem of difficult manufacturing process of the explosion-proof valve 20, and the explosion-proof valve 20 is not easy to be broken; in addition, the notch 13 of the side surface 113 of the first connecting portion 11 allows the gas rushing out of the explosion-proof valve 20 to be discharged in time.

[0054] Specifically, the top cover structure 100 can be applied to the battery 400 as the top of the shell outside the battery cell 200 in the battery 400. The top cover structure 100 includes a pole 10, an explosion-proof valve 20 and a top cover plate 40. The top cover plate 40 has a first surface 41 and a second surface 42 opposite to each other in the thickness direction. The top cover plate 40 is provided with a mounting hole 43 that penetrates the first surface 41 and the second surface 42, and the mounting hole 43 is used to install the pole 10. The top cover plate 40 is used to weld with the side of the shell outside the battery cell 200 to form a complete shell so that the battery cell 200 is in a sealed environment. The shell needs to have a certain strength and hardness, so the top cover plate 40 is made of a material with high hardness and high strength, such as stainless steel. In addition, in order to facilitate welding, the top cover plate 40 can be made of the same material as the side of the shell.

[0055] The pole 10 has a thickness direction (such as Figure 3The pole 10 is provided with a first connection portion 11 and a second connection portion 12 connected to each other (in the extension direction of the central axis O), the first connection portion 11 is located on the side where the first surface 41 of the top cover plate 40 is located, and the second connection portion 12 is penetrated through the mounting hole 43. The second connection portion 12 is closer to the battery cell 200 than the first connection portion 11 (the first connection portion 11 is closer to the connecting piece 310 than the second connection portion 12). The pole 10 is coaxially arranged with the explosion-proof valve 20. Along the thickness direction of the pole 10, the pole 10 is provided with a through hole 14 penetrating the first connection portion 11 and the second connection portion 12, that is, the pole 10 is a hollow cylindrical structure. Figure 4 As shown, the outer diameter of the first connecting portion 11 is greater than the outer diameter of the second connecting portion 12 .

[0056] The through hole 14 includes a first hole section 141 and a second hole section 142 which are connected. The first hole section 141 is close to the first connection portion 11, and the second hole section 142 is close to the second connection portion 12. The size of the first hole section 141 is larger than the size of the second hole section 142. The explosion-proof valve 20 is connected to the inner wall of the through hole 14 and is located at the connection between the first hole section 141 and the second hole section 142. The explosion-proof valve 20 is provided with a notch. When the internal pressure of the battery cell 200 exceeds a preset safety value, the explosion-proof valve 20 will automatically open from the notch to the side away from the second connection portion 12, releasing the gas accumulated inside the battery cell 200, thereby reducing the pressure and preventing the battery 400 from rupturing or exploding.

[0057] The top wall 114 of the first connecting portion 11 is connected to the connecting piece 310 by, for example, welding. The connecting piece 310 can be used to connect multiple battery cells 200 to form a battery cell assembly 300. To facilitate welding, the connecting piece 310 can be made of the same material as the pole 10. The explosion-proof valve 20 and the connecting piece 310 are spaced apart in the axial direction of the pole 10, thereby reserving a circulation space for the gas discharged from the explosion-proof valve 20.

[0058] The side surface 113 of the first connection part 11 is provided with a notch 13 connected to the first hole section 141. When the explosion-proof valve 20 is opened, the gas is discharged from the explosion-proof valve 20, flows in the interval space between the explosion-proof valve 20 and the connection piece 310, and is discharged through the notch 13. In this way, while the first connection part 11 is connected to the connection piece 310, the gas can be discharged in time.

[0059] In the related art, the explosion-proof valve 20 is arranged on the top cover plate 40. In order to ensure the normal welding between the explosion-proof valve 20 and the top cover plate 40, the materials of the explosion-proof valve 20 and the top cover plate 40 must be consistent. In order to ensure the hardness and strength of the top cover plate 40, the top cover plate 40 will be made of stainless steel. If the explosion-proof valve 20 is also made of stainless steel, the residual thickness of the notch of the explosion-proof valve 20 must be reduced a lot to open the valve normally. The low residual thickness value has extremely high requirements on the process of the stainless steel explosion-proof valve 20, and it is easy to be broken.

[0060] In the embodiment of the present application, the explosion-proof valve 20 is connected to the inner wall of the through hole 14 of the pole 10 and is located at the connection between the first hole section 141 and the second hole section 142, that is, the explosion-proof valve 20 is connected to the pole 10 as an integral structure, and the explosion-proof valve 20 is not set on the top cover plate 40, so the explosion-proof valve 20 does not need to use the same material as the top cover plate 40, that is, the explosion-proof valve 20 does not need to use a high hardness and high strength material. In this way, the residual thickness of the notch of the explosion-proof valve 20 can be set within the normal range, solving the problem of the difficulty of the explosion-proof valve 20 process, and the explosion-proof valve 20 is not easy to be broken.

[0061] See also Figures 1 to 4 In some embodiments, the pole 10 and the explosion-proof valve 20 are made of the same material.

[0062] Specifically, the explosion-proof valve 20 is disposed at the first connection portion 11, and the explosion-proof valve 20 can be connected to the pole 10 by welding. The pole 10 and the explosion-proof valve 20 are made of the same material, so that the explosion-proof valve 20 can be welded to the inner wall of the through hole 14.

[0063] The pole 10 is welded to the battery cell 200, and the battery cell 200 includes a current collecting plate and a pole piece. The bottom of the second connecting portion 12 of the pole 10 is used to be welded to the current collecting plate, and the current collecting plate is welded to the pole piece. To facilitate welding, the pole 10, the current collecting plate and the pole piece can be made of the same material, and the explosion-proof valve 20 can also be made of the same material as the pole piece. Compared with the material of the top cover plate 40, the materials of the pole 10, the current collecting plate and the pole piece have lower hardness and strength, so the problem of difficult manufacturing process of the explosion-proof valve 20 is solved, and the explosion-proof valve 20 is not easy to be broken.

[0064] Taking a sodium ion battery as an example, if the pole piece is made of aluminum foil, the pole 10 and the current collecting plate are also made of aluminum, and the explosion-proof valve 20 can also be made of aluminum.

[0065] See also Figure 2 In some embodiments, there are multiple notches 13 , and the multiple notches 13 are evenly distributed along the circumference of the first connecting portion 11 .

[0066] Specifically, the number of the notches 13 is multiple, for example, the number of the notches 13 can be 2, 3, 4 or more, which is not limited here. Figure 2 As shown, the number of the notches 13 is 3. The plurality of notches 13 are evenly distributed along the circumference of the first connecting portion 11, so that the gas at each position in the interval between the explosion-proof valve 20 and the connecting sheet 310 can be quickly discharged, thereby improving the exhaust efficiency.

[0067] See also Figure 4 In some embodiments, a first limiting step 111 is formed on the inner wall of the through hole 14 , and the explosion-proof valve 20 is carried on the first limiting step 111 .

[0068] Specifically, the inner wall of the through hole 14 is away from the central axis of the pole 10 (eg Figure 3 The first limiting step 111 is formed inwardly in the direction of the axis O in the through hole 14, and the explosion-proof valve 20 is carried on the first limiting step 111. The explosion-proof valve 20 can be connected to the first limiting step 111 by welding. In this way, when the explosion-proof valve 20 is welded to the inner wall of the through hole 14, the first limiting step 111 can limit the position of the explosion-proof valve 20 in the through hole 14.

[0069] See also Figure 3 and Figure 4 In some embodiments, the top cover structure 100 also includes a protective sheet 30, which is connected to the inner wall of the through hole 14 and is located at the connection between the first hole section 141 and the second hole section 142. The protective sheet 30 is arranged on one side of the explosion-proof valve 20 close to the first connecting portion 11.

[0070] Specifically, the protective sheet 30 can be made of a high molecular polymer material. For example, the protective sheet 30 can be made of polyethylene glycol terephthalate (PET), polyimide (PI), polyethylene (PE) or other high molecular polymer materials. The protective sheet 30 is connected to the inner wall of the through hole 14 and is located at the connection between the first hole segment 141 and the second hole segment 142. The protective sheet 30 can be connected to the inner wall of the through hole 14 by gluing and is located on the side of the explosion-proof valve 20 close to the first connection portion 11. When the explosion-proof valve 20 automatically opens to the side away from the second connection portion 12, the protective sheet 30 can be opened together with the explosion-proof valve 20. The protective sheet 30 is used to protect the explosion-proof valve 20 to prevent dust, electrolyte, etc. from contaminating the explosion-proof valve 20.

[0071] See also Figure 4 In some embodiments, a second limiting step 112 is formed on the inner wall of the through hole 14 , and the protective sheet 30 is carried on the second limiting step 112 .

[0072] Specifically, the inner wall of the through hole 14 is sunken inward in a direction away from the central axis of the pole 10 to form a second limiting step 112, and the protective sheet 30 is carried on the second limiting step 112, and the protective sheet 30 can be connected to the second limiting step 112 by gluing. In this way, when the protective sheet 30 is bonded to the inner wall of the through hole 14, the second limiting step 112 can limit the position of the protective sheet 30 on the inner wall of the through hole 14.

[0073] See also Figure 3 and Figure 4 In some embodiments, the outer diameter of the protection sheet 30 is greater than the outer diameter of the explosion-proof valve 20 , and the aperture of the through hole 14 at the second limiting step 112 is greater than the aperture at the first limiting step 111 .

[0074] Specifically, the outer diameter of the protective sheet 30 is larger than the outer diameter of the explosion-proof valve 20. Correspondingly, the aperture of the through hole 14 at the second limiting step 112 is larger than the aperture at the first limiting step 111. The protective sheet 30 and the explosion-proof valve 20 can be coaxially arranged. In this way, in the axial direction of the pole 10, the protective sheet 30 can cover the explosion-proof valve 20 to better protect the explosion-proof valve 20.

[0075] See also Figure 3 and Figure 4 In some embodiments, the top cover structure 100 further includes a pressure ring 50, which is disposed around the second connecting portion 12. The pressure ring 50 is located on a side where the second surface 42 of the top cover plate 40 is located.

[0076] Specifically, the pressure ring 50 is arranged around the second connection portion 12 and is welded to the second connection portion 12. To facilitate welding, the pressure ring 50 can be made of the same material as the pole 10. Along the axial direction of the pole 10, the pressure ring 50 is located on the side where the second surface 42 of the top cover plate 40 is located, and the top cover plate 40 is located between the first connection portion 11 and the pressure ring 50. In this way, the pressure ring 50 can limit the position of the top cover plate 40 in the axial direction of the pole 10.

[0077] See also Figure 3 and Figure 4 In some embodiments, the top cover structure 100 further includes a first insulating member 60, which is disposed around the first connecting portion 11 and the second connecting portion 12. Along the axial direction of the pole 10, the first insulating member 60 is located between the first connecting portion 11 and the top cover plate 40. Along the radial direction of the pole 10, the first insulating member 60 is located between the second connecting portion 12 and the top cover plate 40.

[0078] Specifically, the first insulating member 60 can be made of plastic material and has an insulating effect. The first insulating member 60 is arranged around the first connecting portion 11 and the second connecting portion 12. Along the axial direction of the pole 10, the first insulating member 60 is located between the first connecting portion 11 and the top cover plate 40 to isolate the first connecting portion 11 from the top cover plate 40. Along the radial direction of the pole 10, the first insulating member 60 is located between the second connecting portion 12 and the top cover plate 40 to isolate the second connecting portion 12 from the top cover plate 40. In this way, the top cover plate 40 is insulated from the first connecting portion 11 and the second connecting portion 12, respectively, to prevent a short circuit between the top cover plate 40 and the pole 10.

[0079] See also Figure 3 and Figure 4In some embodiments, the top cover structure 100 further includes a second insulating member 70, which is disposed around the second connecting portion 12. Along the axial direction of the pole 10, the second insulating member 70 is located between the top cover plate 40 and the pressure ring 50. Along the radial direction of the pole 10, the second insulating member 70 is located between the second connecting portion 12 and the top cover plate 40.

[0080] Specifically, the second insulating member 70 can be made of plastic material and has an insulating effect. The second insulating member 70 is arranged around the second connecting portion 12. Along the axial direction of the pole 10, the second insulating member 70 is located between the top cover plate 40 and the pressure ring 50 to isolate the top cover plate 40 and the pressure ring 50. Along the radial direction of the pole 10, the second insulating member 70 is located between the second connecting portion 12 and the top cover plate 40 to isolate the second connecting portion 12 and the top cover plate. In this way, the top cover plate 40 is insulated from the second connecting portion 12 and the pressure ring 50 respectively, preventing short circuits between the top cover plate 40 and the pole 10, and between the top cover plate 40 and the pressure ring 50.

[0081] See also Figure 3 and Figure 4 In some embodiments, the top cover structure 100 further includes a seal 80, which is disposed around the second connection portion 12. Along the axial direction of the pole 10, the seal 80 is located between the top cover plate 40 and the pressure ring 50. Along the radial direction of the pole 10, the seal 80 is located between the second connection portion 12 and the top cover plate 40.

[0082] Specifically, the seal 80 can be made of rubber material, for example, fluororubber (Fkm) or EPDM (Ethylene Propylene Diene Monomer, Epdm) rubber. The seal 80 is arranged around the second connection portion 12. Along the axial direction of the pole 10, the seal 80 is located between the top cover plate 40 and the pressure ring 50. Along the radial direction of the pole 10, the seal 80 is located between the second connection portion 12 and the top cover plate 40. On the one hand, the seal 80 can insulate the top cover plate 40 from the pressure ring 50, and the second connection portion 12 from the top cover plate 40. On the other hand, the seal 80 plays a sealing role, and together with the top cover plate 40 and the side of the shell outside the battery cell 200, the battery cell 200 is placed in a sealed environment.

[0083] See also Figures 1 to 5 The embodiment of the present application further provides a battery cell assembly 300. The battery cell assembly 300 includes the top cover structure 100 and the battery cell 200 of any of the above embodiments, and the through hole 14 corresponds to the position of the central hole of the battery cell 200.

[0084] Specifically, the battery cell assembly 300 may include a plurality of battery cells 200, and one battery cell 200 corresponds to one top cover structure 100. In the top cover structure 100, the through hole 14 corresponds to the center hole of the battery cell 200, and the through hole 14 and the center hole of the battery cell 200 are located on the same axis.

[0085] In the related art, the explosion-proof valve 20 is designed on the top cover plate 40. Since the gap between the explosion-proof valve 20 and the battery cell 200 is small and the internal structure of the battery cell 200 is prone to collapse during thermal runaway, exhaust is easily delayed, and ultimately safety accidents such as fire and explosion occur.

[0086] In the embodiment of the present application, the explosion-proof valve 20 is arranged on the pole 10, the explosion-proof valve 20 corresponds to the position of the central hole of the battery cell 200, and the gap between the explosion-proof valve 20 and the battery cell 200 is relatively large. In this way, when the explosion-proof valve 20 is opened, the gas inside the battery cell 200 is discharged in time from the notch 13 of the first connecting portion 11 through the central hole of the battery cell 200 and the through hole 14 of the pole 10, thereby reducing the possibility of safety accidents such as fire and explosion caused by untimely exhaust.

[0087] In addition, the battery cell assembly 300 further includes a connecting piece 310, which is used for connecting the battery cells 200. An opening 311 is also provided at the position of the connecting piece 310 corresponding to the explosion-proof valve 20. When the explosion-proof valve 20 is opened, the gas is discharged from the explosion-proof valve 20 and can flow in the interval between the explosion-proof valve 20 and the connecting piece 310. In addition to being discharged from the notch 13 of the first connecting portion 11, the gas can also be discharged from the opening 311, so that the gas discharge can be further accelerated.

[0088] See also Figure 6 The embodiment of the present application further provides a battery 400. The battery 400 includes the battery cell assembly 300 of any of the above embodiments. The battery 400 may be a secondary battery, such as a sodium ion battery.

[0089] See also Figure 7 The embodiment of the present application also provides an electric device 1000. The electric device 1000 includes the battery 400 of any of the above embodiments. The electric device 1000 can be a smart phone, a tablet computer, a laptop computer, an electric car, an electric bicycle, an industrial device (such as a machine tool) or a household device (such as an air conditioner, a television, etc.).

[0090] In summary, in the top cover structure 100, the battery cell assembly 300, the battery 400 and the electrical equipment 1000 of the embodiment of the present application, the explosion-proof valve 20 is connected to the inner wall of the through hole 14 of the pole 10 and is located at the connection between the first hole section 141 and the second hole section 142, and the side 113 of the first connecting portion 11 of the pole 10 is provided with a notch 13 connected to the first hole section 141. In this way, the explosion-proof valve 20 does not need to use a material with high hardness and high strength, and the residual thickness of the notch of the explosion-proof valve 20 can be set within a normal range, which solves the problem of difficult manufacturing process of the explosion-proof valve 20, and the explosion-proof valve 20 is not easy to be broken; in addition, the notch 13 of the side 113 of the first connecting portion 11 allows the gas rushing out of the explosion-proof valve 20 to be discharged in time.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] 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, characterized in that: The top cover structure includes a pole, an explosion-proof valve and a top cover plate; The top cover plate has a first surface and a second surface opposite to each other in a thickness direction, and a mounting hole penetrating through the first surface and the second surface is provided on the top cover plate; The pole has a first connection portion and a second connection portion connected along the thickness direction, the first connection portion is located on the side of the first surface of the top cover plate, and the second connection portion is penetrated through the mounting hole. The pole is provided with a through hole penetrating the first connection portion and the second connection portion along the thickness direction, and the through hole includes a first hole segment and a second hole segment that are connected, the first hole segment is close to the first connection portion, and the second hole segment is close to the second connection portion. The explosion-proof valve is connected to the inner wall of the through hole and is located at the connection between the first hole segment and the second hole segment, and a notch connected to the first hole segment is provided on the side of the first connection portion.

2. The top cover structure according to claim 1, characterized in that: The pole is made of the same material as the explosion-proof valve.

3. The top cover structure according to claim 1, characterized in that: There are multiple notches, and the multiple notches are evenly distributed along the circumference of the first connecting portion.

4. The top cover structure according to claim 1, characterized in that: A first limiting step is formed on the inner wall of the through hole, and the explosion-proof valve is carried on the first limiting step.

5. The top cover structure according to claim 4, characterized in that: The top cover structure also includes a protection sheet, which is connected to the inner wall of the through hole and located at the connection between the first hole section and the second hole section. The protection sheet is arranged on one side of the explosion-proof valve close to the first connecting portion.

6. The top cover structure according to claim 5, characterized in that: A second limiting step is formed on the inner wall of the through hole, and the protection sheet is carried on the second limiting step.

7. The top cover structure according to claim 6, characterized in that: The outer diameter of the protection sheet is larger than the outer diameter of the explosion-proof valve, and the aperture of the through hole at the second limiting step is larger than the aperture of the through hole at the first limiting step.

8. The top cover structure according to claim 1, characterized in that: The top cover structure further includes a pressure ring, which is arranged around the second connecting portion and is located on a side of the top cover plate where the second surface is located.

9. The top cover structure according to claim 1, characterized in that: The top cover structure further includes a first insulating member, which is disposed around the first connecting portion and the second connecting portion; Along the axial direction of the pole, the first insulating member is located between the first connecting portion and the top cover plate; Along the radial direction of the pole, the first insulating member is located between the second connecting portion and the top cover plate.

10. The top cover structure according to claim 8, characterized in that: The top cover structure further includes a second insulating member, and the second insulating member is arranged around the second connecting portion; Along the axial direction of the pole, the second insulating member is located between the top cover plate and the pressure ring; Along the radial direction of the pole, the second insulating member is located between the second connecting portion and the top cover plate.

11. The top cover structure according to claim 8, characterized in that: The top cover structure further includes a sealing member, and the sealing member is arranged around the second connecting portion; Along the axial direction of the pole, the sealing member is located between the top cover plate and the pressure ring; Along the radial direction of the pole, the sealing member is located between the second connecting portion and the top cover plate.

12. A battery cell assembly, characterized in that: include: The top cover structure according to any one of claims 1 to 11; and The through hole corresponds to the position of the central hole of the battery cell.

13. A battery, characterized in that: Includes the battery core assembly as claimed in claim 12.

14. An electrical device, characterized in that: Comprising the battery of claim 13.

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