Cover plate assembly of battery cell, battery cell, and electric device

Abstract

The utility model discloses a kind of cover plate assembly of battery monomer, battery monomer and electric device, it is related to battery technical field, the cover plate assembly of battery monomer includes: cover plate, explosion-proof structure and buffer layer, the cover plate is formed with first mounting hole, the explosion-proof structure is installed in the first mounting hole, along the thickness direction of the cover plate, at least one side of the explosion-proof structure is provided with the buffer layer, and the buffer layer is fixed to the explosion-proof structure.According to the cover plate assembly of the application, the buffer layer can protect the explosion-proof structure, the buffer layer can support the explosion-proof structure, the deformation amount when the explosion-proof structure is extruded can be reduced, which helps to reduce the probability of rupture caused by deformation of the explosion-proof structure, helps to reduce the probability of functional failure of the explosion-proof structure, helps to reduce the probability of battery monomer leakage, air leakage and other situations, helps to extend the service life of the battery monomer, and helps to improve the reliability of the battery monomer.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a cover plate assembly for a battery cell, a battery cell, and an electrical device. Background Technology

[0002] In related technologies, the cover plate assembly of the battery cell can be equipped with an explosion-proof structure. The explosion-proof structure is constructed as a weak area of ​​the cover plate assembly. When the cover plate assembly of the battery cell is subjected to external pressure, the explosion-proof structure may directly break, resulting in leakage of liquid or gas from the battery cell. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of this invention is to provide a cover plate assembly for a battery cell that can reduce the deformation of the explosion-proof structure under pressure, thereby reducing the probability of cracking due to deformation, decreasing the probability of leakage of liquid or gas from the battery cell, extending the service life of the battery cell, and improving its reliability.

[0004] This invention also proposes a battery cell using the aforementioned cover plate assembly.

[0005] This utility model also proposes an electrical device using the aforementioned battery cell.

[0006] A cover plate assembly for a battery cell according to a first aspect of the present invention includes: a cover plate, an explosion-proof structure, and a buffer layer. The cover plate has a first mounting hole, the explosion-proof structure is installed in the first mounting hole, and the buffer layer is provided on at least one side of the explosion-proof structure along the thickness direction of the cover plate, and the buffer layer is fixed to the explosion-proof structure.

[0007] According to the battery cell cover assembly of the present application embodiment, by setting a buffer layer, the buffer layer can protect the explosion-proof structure, reduce the probability of the explosion-proof structure being directly punctured, support the explosion-proof structure, reduce the amount of deformation of the explosion-proof structure when it is squeezed, which helps to reduce the probability of the explosion-proof structure cracking due to deformation, reduce the probability of the explosion-proof structure failing, reduce the probability of battery cell leakage, gas leakage, etc., extend the service life of the battery cell, and improve the reliability of the battery cell.

[0008] According to some embodiments of the present invention, the explosion-proof structure is formed with explosion-proof markings, which are arranged around the buffer layer along the circumferential edge of the buffer layer.

[0009] According to some embodiments of the present invention, the buffer layer is located inside the first mounting hole.

[0010] According to some embodiments of the present invention, the cover plate assembly further includes: a support layer, wherein the support layer is provided on at least one side of the cover plate along the thickness direction of the cover plate, and at least a portion of the support layer and the first mounting hole are disposed opposite to each other along the thickness direction of the cover plate.

[0011] According to some embodiments of the present invention, the support layer and the explosion-proof structure are spaced apart along the thickness direction of the cover plate.

[0012] According to some embodiments of this utility model, the distance between the support layer and the explosion-proof structure is H, which satisfies the relationship: 0mm < H < 3mm.

[0013] According to some embodiments of the present invention, the support layer covers the first mounting hole, and the support layer forms a medium through hole. The medium through hole penetrates the support layer along the thickness direction of the cover plate, and at least a portion of the medium through hole and the first mounting hole are arranged opposite to each other along the thickness direction of the cover plate.

[0014] According to some embodiments of the present invention, the medium through hole includes a plurality of sub-medium through holes, and at least one of the sub-medium through holes is disposed opposite to the first mounting hole.

[0015] According to some embodiments of the present invention, the support layer includes: a connected support layer body and a partition structure. The support layer body has a second mounting hole. At least a portion of the second mounting hole and the first mounting hole are disposed opposite to each other along the thickness direction of the cover plate. The partition structure is disposed in the second mounting hole to divide the second mounting hole into a plurality of sub-medium through holes, and at least a portion of the partition structure is disposed opposite to the first mounting hole.

[0016] According to a second aspect of the present invention, the battery cell includes the cover plate assembly of the battery cell described in the above embodiments.

[0017] The battery cell according to the third aspect of the present invention includes the battery cell described in the above embodiments.

[0018] Additional aspects and advantages of this invention 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 the invention. Attached Figure Description

[0019] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0020] Figure 1This is a top view of the cover plate assembly according to an embodiment of this application;

[0021] Figure 2 yes Figure 1 Sectional view at point AA;

[0022] Figure 3 This is a bottom view of the explosion-proof structure and cover plate assembled according to an embodiment of this application;

[0023] Figure 4 This is a schematic diagram of an explosion-proof structure according to an embodiment of this application;

[0024] Figure 5 This is a bottom view of the cover plate assembly according to the first embodiment of this application;

[0025] Figure 6 This is a bottom view of the cover plate assembly according to the second embodiment of this application;

[0026] Figure 7 This is a bottom view of the cover plate assembly according to the third embodiment of this application;

[0027] Figure 8 This is a bottom view of the cover plate assembly according to the fourth embodiment of this application.

[0028] Figure label:

[0029] Cover assembly 100,

[0030] Cover plate 10, first mounting hole 11, third mounting hole 12,

[0031] Explosion-proof structure 20, explosion-proof markings 21, first explosion-proof body 22, second explosion-proof body 23

[0032] Buffer layer 30,

[0033] Support layer 40, medium through hole 41, sub-medium through hole 411, support layer body 42, second mounting hole 421, partition structure 43, first substructure 431, second substructure 432, third substructure 433, fourth substructure 434, first annular structure 435, fifth substructure 436, second annular structure 437, third annular structure 438, sixth substructure 439, fourth mounting hole 44.

[0034] 200 electrode post, 210 electrode terminal

[0035] Electrical adapter 300. Detailed Implementation

[0036] The embodiments of this utility model are described in detail below. Examples of these 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 utility model, and should not be construed as limiting this utility model.

[0037] The following is for reference. Figures 1-8 Description of a cover plate assembly 100 for a battery cell according to an embodiment of the present invention.

[0038] According to the first aspect of the present invention, the cover plate assembly 100 of the battery cell, such as Figures 1-4 As shown, the cover plate assembly 100 of the battery cell may include: a cover plate 10, an explosion-proof structure 20 and a buffer layer 30. The cover plate 10 has a first mounting hole 11, the explosion-proof structure 20 is installed in the first mounting hole 11, and the buffer layer 30 is provided on at least one side of the explosion-proof structure 20 along the thickness direction of the cover plate 10, and the buffer layer 30 is fixed to the explosion-proof structure 20.

[0039] It should be noted that the cover assembly of the battery cell may be equipped with an explosion-proof structure. The explosion-proof structure is designed to be a weak point of the cover assembly. When the cover assembly of the battery cell is subjected to external pressure, the explosion-proof structure may break directly, resulting in leakage of liquid or gas from the battery cell.

[0040] Based on this, this application provides a cover plate assembly 100 for a battery cell. The cover plate 10 may have a first mounting hole 11, which can penetrate the cover plate 10 along its thickness direction. When the cover plate 10 is... Figure 2 When setting the orientation, the thickness direction of the cover plate 10 can be... Figure 2 The explosion-proof structure 20 can be constructed as a thin metal sheet, an explosion-proof valve, or other structures. The explosion-proof structure 20 can be fixedly connected to the cover plate 10 by welding, snap-fitting, or other methods. The explosion-proof structure 20 can be installed inside the first mounting hole 11 and can abut against the inner wall of the first mounting hole 11. As an example, the height dimension of the explosion-proof structure 20 along the thickness direction of the cover plate 10 can be less than the thickness dimension of the cover plate 10, and the entire structure of the explosion-proof structure 20 can be located inside the cover plate 10. Along the thickness direction of the cover plate 10, at least one side of the explosion-proof structure 20 can be provided with a buffer layer 30. When the cover plate assembly 100 is assembled to the battery cell, the buffer layer 30 can be provided on the side of the explosion-proof structure 20 facing the inside of the battery cell, or on the side of the explosion-proof structure 20 away from the inside of the battery cell, or buffer layers 30 can be provided on both sides of the explosion-proof structure 20 along the thickness direction of the cover plate 10. The cross-sectional shape of the buffer layer 30 can be adapted to the cross-sectional shape of the explosion-proof structure 20.

[0041] The buffer layer 30 can be composed of a highly elastic polymer film that is repellent to organic solvents, air-proof, and possesses high elasticity. The polymer film can be made of materials such as polyurethane, polyacrylate, polyvinyl alcohol, polybutadiene, and polyisoprene. By providing the buffer layer 30, organic solvents can be repelled. When the buffer layer 30 is located on the side of the explosion-proof structure 20 facing the inside of the battery cell, the buffer layer 30 can reduce the probability of electrolyte leakage from inside the battery cell. The buffer layer 30 can be fixed to the explosion-proof structure 20, bonded to the explosion-proof structure 20, or coated onto the explosion-proof structure 20. The buffer layer 30 can be disposed on at least one surface of the explosion-proof structure 20 along the thickness direction of the cover plate 10. The buffer layer 30's repellency to organic solvents reduces the probability of electrolyte leakage. When the explosion-proof structure 20 is compressed, the buffer layer 30, due to its high elasticity, can support the explosion-proof structure 20, reduce the deformation of the explosion-proof structure 20, and decrease the probability of the explosion-proof structure 20 breaking due to deformation. The buffer layer 30 can also protect the explosion-proof structure 20, reducing the probability of the explosion-proof structure 20 being directly punctured when it is compressed by a sharp object, and reducing the probability of the explosion-proof structure 20 failing. This helps to reduce the probability of battery cell leakage, gas leakage, etc., which helps to extend the service life of the battery cells and improve the reliability of the battery cells.

[0042] As an example, when the explosion-proof structure 20 has a buffer layer 30 on the side facing the inside of the battery cell, the buffer layer 30 can protect the explosion-proof structure 20 when the battery cell is squeezed, and can reduce the probability that the explosion-proof structure 20 is directly punctured by other components inside the battery cell.

[0043] As an example, when the explosion-proof structure 20 is slightly punctured, but the puncturing structure does not penetrate the buffer layer 30, that is, the puncturing structure penetrates only part of the thickness of the buffer layer 30, the highly elastic buffer layer 30 can rebound and close the puncture hole. The buffer layer 30 can seal the cracks or fissures on the explosion-proof structure 20, thereby reducing the probability of battery cell leakage or gas leakage when the explosion-proof structure 20 is slightly punctured, which is beneficial to extending the service life of the battery cell.

[0044] As an example, when the inside of a battery cell is under negative pressure, the explosion-proof structure 20 may deform and indent into the battery cell. Since the buffer layer 30 has high elasticity, it can support the explosion-proof structure 20, reduce the deformation of the explosion-proof structure 20, and reduce the probability of the explosion-proof structure 20 deforming and breaking under negative pressure inside the battery cell, which is beneficial to extending the service life of the explosion-proof structure 20.

[0045] In this embodiment, by providing a buffer layer 30, the buffer layer 30 can protect the explosion-proof structure 20, reduce the probability of the explosion-proof structure 20 being directly punctured, support the explosion-proof structure 20, reduce the amount of deformation of the explosion-proof structure 20 when it is squeezed, which helps to reduce the probability of the explosion-proof structure 20 breaking due to deformation, reduce the probability of the explosion-proof structure 20 failing, reduce the probability of battery cell leakage, gas leakage, etc., extend the service life of the battery cells, and improve the reliability of the battery cells.

[0046] As an example, such as Figure 2 and Figure 3 As shown, the explosion-proof structure 20 may include a first explosion-proof body 22 and a second explosion-proof body 23. The first explosion-proof body 22 may be constructed as a columnar structure, and the second explosion-proof body 23 may be constructed as a ring structure. The second explosion-proof body 23 may be arranged around the first explosion-proof body 22 along its circumference. The first explosion-proof body 22 and the second explosion-proof body 23 may be integrally formed. Along the arrangement direction of the second explosion-proof body 23 and the first explosion-proof body 22, from the second explosion-proof body 23 to the first explosion-proof body 22, the thickness of the second explosion-proof body 23 along the thickness direction of the explosion-proof structure 20 gradually decreases. The thickness of the second explosion-proof body 23 along the thickness direction of the explosion-proof structure 20 may gradually decrease in a stepped manner. The end faces of the first explosion-proof body 22 and the second explosion-proof body 23 on one side along the thickness direction of the explosion-proof structure 20 may be coplanar. The thickness of any part of the second explosion-proof body 23 along the thickness direction of the explosion-proof structure 20 is greater than the thickness of the first explosion-proof body 22 along the thickness direction of the explosion-proof structure 20. The thickness of the connection between the second explosion-proof body 23 and the first explosion-proof body 22 is greater than the thickness of the first explosion-proof body 22. Furthermore, the thickness of the connection between the second explosion-proof body 23 and the cover plate 10 is greater than the thickness of the connection between the second explosion-proof body 23 and the first explosion-proof body 22. In other words, the thickness of the connection between the explosion-proof structure 20 and the cover plate 10 is greater, which can improve the connection strength between the explosion-proof structure 20 and the cover plate 10 and reduce the probability of the explosion-proof structure 20 detaching from the first mounting hole 11. When the buffer layer 30 is connected to the explosion-proof structure 20, the buffer layer 30 can be fixed to the first explosion-proof body 22.

[0047] As an example, such as Figure 1 and Figure 2 As shown, the cover plate 10 can be constructed as a plate-like structure with a rectangular cross-section. The cover plate 10 can have a third mounting hole 12, which penetrates the cover plate 10 along its thickness direction. The third mounting hole 12 is positioned opposite to and spaced apart from the first mounting hole 11 along the length direction of the cover plate 10. When the cover plate assembly 100 is as described... Figure 2 When setting the direction, the length direction of the cover plate 10 is... Figure 2The X-direction in the middle. The battery cell may include a terminal post 200, which can be fixedly connected to the cover plate 10 by means of snap-fit, welding or other methods. The terminal post 200 may include two electrode terminals 210, which can be installed in the third mounting hole 12. When the cover plate assembly 100 is assembled to the battery cell, the electrode terminals 210 can pass through the corresponding third mounting hole 12 and extend into the battery cell.

[0048] In some embodiments of this utility model, such as Figure 3 and Figure 4 As shown, the explosion-proof structure 20 has explosion-proof grooves 21, which are arranged around the buffer layer 30 along the circumferential edge of the buffer layer 30.

[0049] The explosion-proof structure 20 can have explosion-proof notches 21, which can be annular and extend circumferentially along the explosion-proof structure 20. When a battery cell experiences thermal runaway, it will generate high-temperature flammable gas or particulate matter. This application uses the generation of high-temperature flammable gas during thermal runaway as an example for illustration. When a battery cell experiences thermal runaway, the internal pressure of the battery cell increases. The high-temperature flammable gas inside the battery cell can cause the explosion-proof structure 20 to crack at the explosion-proof notches 21, thereby achieving the effect of timely pressure release from the battery cell. The explosion-proof structure 20 can release gas when the internal pressure of the battery cell is too high, reducing the probability of the battery cell deforming or rupturing due to excessive pressure, thus maintaining the structural integrity of the battery cell and further extending its service life. When the battery cell is operating normally and no high-temperature flammable gas is generated inside the battery cell, the explosion-proof structure 20 remains structurally intact, and the battery cell is in a sealed state.

[0050] The explosion-proof notch 21 can be set around the buffer layer 30 along its circumferential edge. The orthographic projection of the buffer layer 30 along the thickness direction of the cover plate 10 lies inside the orthographic projection of the explosion-proof notch 21 along the thickness direction of the cover plate 10. This helps reduce the probability that the buffer layer 30 will prevent the explosion-proof structure 20 from cracking at the explosion-proof notch 21 when the internal pressure of the battery cell is too high, allowing the battery cell to achieve timely pressure relief, which is beneficial to improving the reliability of the explosion-proof structure 20 and further improving the reliability of the battery cell. In addition, the buffer layer 30 can also support the explosion-proof structure 20. When the explosion-proof structure 20 is compressed, the buffer layer 30 can reduce the deformation of the explosion-proof structure 20, thereby reducing the risk that the explosion-proof notch 21 will be directly torn due to large deformation of the explosion-proof structure 20, which is beneficial to further improving the reliability of the explosion-proof structure 20.

[0051] In some embodiments of this utility model, the buffer layer 30 is located inside the first mounting hole 11.

[0052] The explosion-proof structure 20 is installed in the first mounting hole 11. The buffer layer 30 can be fixedly connected to the first explosion-proof body 22. The buffer layer 30 is located in the first mounting hole 11. The buffer layer 30 can fill the gap between the surface of the adjacent cover plate 10 and the explosion-proof structure 20. The buffer layer 30 can buffer and support the explosion-proof structure 20, which is conducive to further reducing the deformation of the explosion-proof structure 20 when it is squeezed. It can also help improve the compactness of the buffer layer 30 and the explosion-proof structure 20, without occupying additional internal or external space of the battery cell. This helps reduce the space occupied by the cover plate assembly 100. Furthermore, it can reduce the probability of interference between the buffer layer 30 and other components of the battery cell, which helps improve the reliability of the buffer layer 30.

[0053] In some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the cover plate assembly 100 may further include: a support layer 40, which is provided on at least one side of the cover plate 10 along the thickness direction of the cover plate 10, and at least a portion of the support layer 40 and the first mounting hole 11 are disposed opposite to each other along the thickness direction of the cover plate 10.

[0054] Along the thickness direction of the cover plate 10, a support layer 40 is provided on at least one side of the cover plate 10. The support layer 40 can be located on the side of the cover plate 10 away from the interior of the battery cell. If the support layer 40 is located on the side of the cover plate 10 away from the interior of the battery cell, when the cover plate 10 is subjected to external pressure, the external pressure can preferentially act on the support layer 40, and the support layer 40 can protect the explosion-proof structure 20, reducing the probability of the explosion-proof structure 20 being directly damaged. Alternatively, the support layer 40 can be located on the side of the cover plate 10 facing the interior of the battery cell, and a buffer layer 30 can be located between the explosion-proof structure 20 and the support layer 40. The buffer layer 30 can fill the gap between the explosion-proof structure 20 and the support layer 40. When the cover plate 10 is damaged by the interior of the battery cell, the buffer layer 30 can support the explosion-proof structure 20 and the support layer 40, further reducing the deformation of the explosion-proof structure 20. When the cover plate 10 is subjected to external pressure, the support layer 40 can be used to support the buffer layer 30, which can further reduce the deformation of the explosion-proof structure 20 and further reduce the probability of the explosion-proof structure 20 deforming and breaking.

[0055] This embodiment of the application takes the support layer 40 being disposed on the side of the cover plate 10 facing the inside of the battery cell as an example. When the cover plate 10 is disposed in the vertical direction, the support layer 40 can be disposed below the cover plate 10. At least a portion of the support layer 40 can be disposed opposite to the first mounting hole 11 along the thickness direction of the cover plate 10, and at least a portion of the support layer 40 can be located below the first mounting hole 11. When the cover plate 10 is subjected to external pressure, at least a portion of the support layer 40 can be used to support the buffer layer 30, thereby further reducing the deformation of the explosion-proof structure 20, which is beneficial to further reducing the probability of deformation and breakage of the explosion-proof structure 20, and further extending the service life of the explosion-proof structure 20.

[0056] In some embodiments of this utility model, such as Figure 2 As shown, the support layer 40 and the explosion-proof structure 20 are spaced apart along the thickness direction of the cover plate 10.

[0057] At least a portion of the support layer 40 and the first mounting hole 11 are disposed opposite each other along the thickness direction of the cover plate 10. In this embodiment, the support layer 40 is disposed on the side of the cover plate 10 facing the inside of the battery cell. When the cover plate 10 is disposed in the vertical direction, the support layer 40 can be located below the explosion-proof structure 20. The support layer 40 and the explosion-proof structure 20 can be spaced apart along the thickness direction of the cover plate 10, and a gap can be formed between the support layer 40 and the explosion-proof structure 20. A buffer layer 30 can be disposed in the gap between the support layer 40 and the explosion-proof structure 20. When the cover plate 10 is deformed by external pressure, the support layer 40 can support the buffer layer 30, allowing the buffer layer 30 to better protect the explosion-proof structure 20 and further reducing the probability of deformation and breakage of the explosion-proof structure 20.

[0058] As an example, when the support layer 40 is located on the side of the cover plate 10 away from the inside of the battery cell, the support layer 40 and the explosion-proof structure 20 are spaced apart, which is conducive to the explosion-proof structure 20 deforming freely when the internal pressure of the battery cell is too high, so that the explosion-proof structure 20 can crack smoothly at the explosion-proof notch 21, and the gas flow can be smooth when the battery cell is depressurized.

[0059] In some embodiments of this utility model, the distance between the support layer 40 and the explosion-proof structure 20 is H, which satisfies the relationship: 0mm < H < 3mm.

[0060] For example, the spacing between the support layer 40 and the explosion-proof structure 20 can be 0.1mm, 0.8mm, 1.2mm, 2.3mm, 2.9mm, etc., and the spacing between the support layer 40 and the explosion-proof structure 20 can be within the range of 0mm to 3mm. These are all optional spacing distances between the support layer 40 and the explosion-proof structure 20 in this utility model. If the spacing between the support layer 40 and the explosion-proof structure 20 is equal to 0mm, then the support layer 40 and the explosion-proof structure 20 abut against each other along the thickness direction of the cover plate 10, and the support layer 40 and the explosion-proof structure 20 are not separated, so the buffer layer 30 cannot be set between the support layer 40 and the explosion-proof structure 20. If the distance between the support layer 40 and the explosion-proof structure 20 is greater than or equal to 3mm, it will result in a large distance between them, affecting the structural compactness of the support layer 40 and the explosion-proof structure 20, increasing the volume of the cover plate 10, affecting the space utilization of the battery cell, and also affecting the support effect of the support layer 40 on the buffer layer 30, resulting in a large deformation of the explosion-proof structure 20 under pressure. Therefore, the distance between the support layer 40 and the explosion-proof structure 20 should be between 0mm and 3mm. This allows the support layer 40 and the explosion-proof structure 20 to be spaced apart, enabling the buffer layer 30 to be placed between them. It also makes the structure of the support layer 40 and the explosion-proof structure 20 more compact, which is beneficial to improving the space utilization of the battery cell. The support layer 40 can better support the buffer layer 30, resulting in a smaller deformation of the explosion-proof structure 20 under pressure.

[0061] In some embodiments of this utility model, such as Figures 5-8 As shown, the support layer 40 covers the first mounting hole 11, and the support layer 40 has a medium through hole 41. The medium through hole 41 penetrates the support layer 40 along the thickness direction of the cover plate 10, and at least a portion of the medium through hole 41 and the first mounting hole 11 are arranged opposite to each other along the thickness direction of the cover plate 10.

[0062] The support layer 40 can cover the first mounting hole 11. The support layer 40 can be fixedly connected to the cover plate 10 by welding, bolting, or other means. The support layer 40 can enhance the deformation resistance of the cover plate 10 where the first mounting hole 11 is formed, thereby further reducing the deformation of the explosion-proof structure 20 when it is subjected to pressure. The support layer 40 can form a medium through hole 41, which can penetrate the support layer 40 along the thickness direction (i.e., the thickness direction of the cover plate 10). At least a portion of the medium through hole 41 and the first mounting hole 11 are arranged opposite to each other along the thickness direction of the cover plate 10. At least a portion of the medium through hole 41 can connect the first mounting hole 11 and the internal space of the battery cell.

[0063] When a battery cell experiences thermal runaway and its internal pressure increases, the high-temperature combustible gas inside causes the explosion-proof structure 20 to crack at the explosion-proof notch 21. By providing the medium passage 41, the probability of the support layer 40 obstructing the flow of high-temperature combustible gas to the explosion-proof structure 20 can be reduced, allowing the high-temperature combustible gas to smoothly break through the explosion-proof notch 21, causing the explosion-proof structure 20 to crack at the notch 21. This further achieves the effect of timely releasing the pressure of the battery cell, further reducing the probability of the battery cell deforming or rupturing due to excessive pressure, thereby further maintaining the structural integrity of the battery cell and helping to further extend its service life.

[0064] As an example, the support layer 40 may have a fourth mounting hole 44, which may penetrate the support layer 40 along its thickness direction. When the support layer 40 is fixed on the cover plate 10, the third mounting hole 12 and the fourth mounting hole 44 may be correspondingly arranged along the arrangement direction of the support layer 40 and the cover plate 10 (i.e., the thickness direction of the cover plate 10). The battery cell may include an electrical adapter 300, which may pass through the fourth mounting hole 44 and may be electrically connected to the electrode terminal 210 on the pole post 200.

[0065] In some embodiments of this utility model, such as Figures 5-8 As shown, the medium through hole 41 may include a plurality of sub-medium through holes 411, and at least one of the sub-medium through holes 411 is disposed opposite to the first mounting hole 11.

[0066] At least a portion of the dielectric through-hole 41 and the first mounting hole 11 are arranged opposite to each other along the thickness direction of the cover plate 10. The dielectric through-hole 41 may include multiple sub-dielectric through-holes 411, and at least one of the multiple sub-dielectric through-holes 411 may be arranged opposite to the first mounting hole 11. When high-temperature combustible gas is generated inside the battery cell, the high-temperature combustible gas can flow to the first mounting hole 11 through at least one sub-dielectric through-hole 411, causing the explosion-proof structure 20 to crack from the explosion-proof notch 21, allowing the battery cell to release pressure smoothly. By setting multiple sub-dielectric through-holes 411, the support layer 40 can be subjected to uniform stress, which helps to reduce stress concentration and reduces the probability of cracking or damage to the support layer 40. Furthermore, when a sub-dielectric through-hole 411 becomes blocked, the high-temperature combustible gas can flow to the first mounting hole 11 through other sub-dielectric through-holes 411, which helps to further improve the reliability of the battery cell.

[0067] In some embodiments of this utility model, such as Figures 5-8As shown, the support layer 40 may include: a connected support layer body 42 and a partition structure 43. The support layer body 42 has a second mounting hole 421. At least a portion of the second mounting hole 421 and the first mounting hole 11 are disposed opposite to each other along the thickness direction of the cover plate 10. The partition structure 43 is disposed in the second mounting hole 421 to divide the second mounting hole 421 into a plurality of sub-medium through holes 411, and at least a portion of the partition structure 43 is disposed opposite to the first mounting hole 11.

[0068] The support layer 40 may include a connected support layer body 42 and a partition structure 43, which may be welded together or integrally formed. The support layer body 42 may have a second mounting hole 421, which may penetrate the support layer body 42 along the thickness direction of the cover plate 10. At least a portion of the second mounting hole 421 may be disposed opposite to the first mounting hole 11 along the thickness direction of the cover plate 10. The second mounting hole 421 may be configured as a medium through hole 41. The partition structure 43 can be provided in the second mounting hole 421. The partition structure 43 can be connected to the inner wall of the second mounting hole 421. The partition structure 43 can divide the second mounting hole 421 into multiple sub-medium through holes 411. At least part of the partition structure 43 is arranged opposite to the first mounting hole 11, so that at least one medium through hole 41 and the first mounting hole 11 are arranged opposite to each other along the thickness direction of the cover plate 10. This allows the high-temperature combustible gas inside the battery cell to flow to the first mounting hole 11 through at least one sub-medium through hole 411, and causes the explosion-proof structure 20 to crack from the explosion-proof notch 21, so that the battery cell can be depressurized smoothly.

[0069] By setting the partition structure 43, the second mounting hole 421 can be divided into multiple sub-medium through holes 411, which is beneficial for the high-temperature combustible gas in the battery cell to flow smoothly to the first mounting hole 11, which is beneficial for improving the structural strength of the support layer body 42, thereby improving the impact resistance of the support layer 40, which is beneficial for extending the service life of the support layer 40, and further extending the service life of the battery cell.

[0070] It should be noted that, as Figure 5 As shown, Figure 5 This is a bottom view of the cover plate assembly 100 according to the first embodiment of this application, as shown below. Figure 6 As shown, Figure 6 This is a bottom view of the cover plate assembly 100 according to the second embodiment of this application, as shown below. Figure 7 As shown, Figure 7 This is a bottom view of the cover plate assembly 100 according to the third embodiment of this application, as shown below. Figure 8 As shown, Figure 8This is a bottom view of the cover plate assembly 100 according to the fourth embodiment of this application. The difference between the first, second, third and fourth embodiments of this application is that the shape of the partition structure 43 in the first, second, third and fourth embodiments of this application is different, thereby making the shape of the sub-medium through hole 411 different.

[0071] According to the first embodiment of this application, the cover plate assembly 100, such as Figure 5 As shown, the partition structure 43 on the support layer 40 can be composed of multiple first substructures 431 and second substructures 432. The multiple first substructures 431 can extend along the length direction of the cover plate 10, and can be arranged opposite to each other and spaced apart along the width direction of the cover plate 10. The multiple first substructures 431 can be evenly arranged along the width direction of the cover plate 10. Similarly, the multiple second substructures 432 can extend along the width direction of the cover plate 10, and can be arranged opposite to each other and spaced apart along the length direction of the cover plate 10. The multiple second substructures 432 can be evenly arranged along the length direction of the cover plate 10, thereby dividing the second mounting hole 421 into multiple sub-medium through holes 411. The sub-medium through holes 411 can be constructed as square holes or similar to square holes. When the cover plate assembly 100 is as follows... Figure 5 When setting the direction, the width direction of the cover plate 10 can be... Figure 5 The Y-direction in the middle.

[0072] According to the second embodiment of this application, the cover plate assembly 100, such as Figure 6 As shown, the partition structure 43 on the support layer 40 can be composed of multiple third substructures 433 and fourth substructures 434. The multiple third substructures 433 can extend along the length direction of the cover plate 10, and the multiple fourth substructures 434 can be arranged opposite to each other and spaced apart along the width direction of the cover plate 10. The multiple third substructures 433 can be evenly arranged along the width direction of the cover plate 10, and the multiple fourth substructures 434 can extend along the width direction of the cover plate 10. The multiple fourth substructures 434 can be arranged opposite to each other and spaced apart along the length direction of the cover plate 10. The multiple fourth substructures 434 can be evenly arranged along the length direction of the cover plate 10, thereby dividing the second mounting hole 421 into multiple sub-medium through holes 411. The sub-medium through holes 411 can be constructed as circular holes.

[0073] According to the third embodiment of this application, the cover plate assembly 100, such as Figure 7As shown, the partition structure 43 on the support layer 40 may include a first annular structure 435 and a plurality of fifth substructures 436. The fifth substructures 436 may extend radially along the first annular structure 435. One end of the plurality of fifth substructures 436 is connected to each other, and one end of each of the plurality of fifth substructures 436 is connected to the first annular structure 435. The other end of the plurality of fifth substructures 436 is connected to the support layer body 42. The plurality of fifth substructures 436 are spaced apart circumferentially along the first through hole, thereby dividing the second mounting hole 421 into a plurality of sub-medium through holes 411.

[0074] According to the fourth embodiment of this application, the cover plate assembly 100, such as Figure 8 As shown, the partition structure 43 on the support layer 40 may include a second annular structure 437, a third annular structure 438, and a plurality of sixth substructures 439. The third annular structure 438 is sleeved on the second annular structure 437. The third annular structure 438 and the second annular structure 437 are arranged radially apart. The central axis of the third annular structure 438, the central axis of the second annular structure 437, and the central axis of the second mounting hole 421 are collinear. The plurality of sixth substructures 439 are arranged to intersect each other. The plurality of sixth substructures 439 intersect at the center of the second mounting hole 421, thereby dividing the second mounting hole 421 into a plurality of sub-medium through holes 411.

[0075] In some embodiments of this utility model, when the same extrusion structure is used to extrude the cover plate assembly 100 without the support layer 40, the cover plate assembly 100 of the first embodiment of this application, the cover plate assembly 100 of the second embodiment of this application, the cover plate assembly 100 of the third embodiment of this application, and the cover plate assembly 100 of the fourth embodiment of this application, and the explosion-proof structure 20 therein is deformed, the value of the extrusion force acting on the corresponding cover plate assembly 100 when the explosion-proof structure 20 is deformed and broken can be measured, thereby obtaining a cover plate assembly 100 with higher reliability.

[0076] When the cover assembly 100 without the support layer 40 is subjected to external pressure (a hemisphere with a diameter of 30 mm) at a pressure of 3 kN, the explosion-proof structure 20 ruptures. When the cover assembly 100 of the first embodiment of this application is subjected to external pressure (a hemisphere with a diameter of 30 mm) at a pressure of 27 kN, the explosion-proof structure 20 ruptures. When the cover assembly 100 of the second embodiment of this application is subjected to external pressure (a hemisphere with a diameter of 30 mm) at a pressure of 25 kN, the explosion-proof structure 20 ruptures. When the cover assembly 100 of the third embodiment of this application is subjected to external pressure (a hemisphere with a diameter of 30 mm) at a pressure of 22 kN, the explosion-proof structure 20 ruptures. When the cover assembly 100 of the fourth embodiment of this application is subjected to external pressure (a hemisphere with a diameter of 30 mm) at a pressure of 20 kN, the explosion-proof structure 20 ruptures. Therefore, in several embodiments of this application, the cover plate assembly 100 of the first embodiment of this application can have better resistance to deformation, wherein the explosion-proof structure 20 has a lower probability of deformation when subjected to pressure.

[0077] According to a second aspect of the present invention, the battery cell includes the cover assembly 100 of the battery cell in the above embodiment.

[0078] According to the embodiments of this application, the use of the cover plate assembly 100 of the battery cell in the above embodiments can reduce the probability of the explosion-proof structure 20 breaking when the battery cell is squeezed, improve the reliability of the battery cell, and help extend the service life of the battery cell.

[0079] The battery cell according to the third aspect of the present invention includes the battery cell in the above embodiments.

[0080] According to the battery cells in the embodiments of this application, using the battery cells in the above embodiments can improve the reliability of the electrical device and help extend the service life of the electrical device.

[0081] The cover plate assembly 100 of the battery cell, other components and operations of the battery cell and the electrical device according to the embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0082] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. 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.

[0083] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A cover plate assembly for a single battery cell, characterized in that, include: The cover plate (10) and the explosion-proof structure (20) are provided, wherein the cover plate (10) has a first mounting hole (11) and the explosion-proof structure (20) is installed in the first mounting hole (11); A buffer layer (30) is provided on at least one side of the explosion-proof structure (20) along the thickness direction of the cover plate (10), and the buffer layer (30) is fixed to the explosion-proof structure (20).

2. The cover plate assembly for a battery cell according to claim 1, characterized in that, The explosion-proof structure (20) has explosion-proof grooves (21) formed around the buffer layer (30) along the circumferential edge of the buffer layer (30).

3. The cover plate assembly for a battery cell according to claim 1, characterized in that, The buffer layer (30) is located inside the first mounting hole (11).

4. The cover plate assembly for a battery cell according to any one of claims 1-3, characterized in that, The cover plate assembly (100) further includes a support layer (40), which is provided on at least one side of the cover plate (10) along the thickness direction of the cover plate (10), and at least a portion of the support layer (40) and the first mounting hole (11) are disposed opposite to each other along the thickness direction of the cover plate (10).

5. The cover plate assembly for a battery cell according to claim 4, characterized in that, Along the thickness direction of the cover plate (10), the support layer (40) and the explosion-proof structure (20) are spaced apart.

6. The cover plate assembly for a battery cell according to claim 5, characterized in that, The distance between the support layer (40) and the explosion-proof structure (20) is H, which satisfies the relationship: 0mm < H < 3mm.

7. The cover plate assembly for a battery cell according to claim 4, characterized in that, The support layer (40) covers the first mounting hole (11), and the support layer (40) forms a medium through hole (41). The medium through hole (41) penetrates the support layer (40) along the thickness direction of the cover plate (10), and at least a portion of the medium through hole (41) and the first mounting hole (11) are arranged opposite to each other along the thickness direction of the cover plate (10).

8. The cover plate assembly for a battery cell according to claim 7, characterized in that, The medium through hole (41) includes a plurality of sub-medium through holes (411), and at least one of the sub-medium through holes (411) is disposed opposite to the first mounting hole (11).

9. The cover plate assembly for a battery cell according to claim 8, characterized in that, The support layer (40) includes a connected support layer body (42) and a partition structure (43). The support layer body (42) has a second mounting hole (421). At least a portion of the second mounting hole (421) and the first mounting hole (11) are disposed opposite to each other along the thickness direction of the cover plate (10). The partition structure (43) is disposed in the second mounting hole (421) to divide the second mounting hole (421) into a plurality of sub-medium through holes (411), and at least a portion of the partition structure (43) is disposed opposite to the first mounting hole (11).

10. A single battery cell, characterized in that, Includes a cover assembly (100) for a battery cell according to any one of claims 1-9.

11. An electrical appliance, characterized in that, Includes the battery cell according to claim 10.

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