Energy storage device monomer, energy storage device module and power utilization device

Abstract

The utility model relates to an energy storage device single body, an energy storage device module and a power utilization device, the energy storage device single body comprises a shell, the shell is provided with a top end opening, and a first groove is formed in the part, close to the top end opening, of the outer wall of the shell; the top cover is arranged at the top end opening, a second groove is formed in the top face, away from the shell, of the top cover, and the second groove is formed around the periphery of the top cover; the sealing element is formed on the periphery of the top surface of the top cover and the outer periphery of the top end of the shell by adopting an injection molding process, the sealing element is tightly attached to the top cover and the top end of the shell, the sealing element comprises a first combination body and a second combination body, the first combination body is formed in the first groove, and the second combination body is formed in the second groove. Compared with a welding sealing process, the sealing piece is in sealing connection with the top cover and the shell through the injection molding process, the sealing process cost is greatly reduced, the problem of material cracking caused by stress release does not exist, and the potential hidden danger of sealing failure is eliminated.

Description

Technical Field

[0001] The present application relates to the technical field of secondary energy storage devices, and in particular to an energy storage device monomer, an energy storage device module and an electrical device. Background Art

[0002] Electrolyte is an important medium in the composition of batteries. It is used to provide ions for the normal operation of batteries and ensure that the chemical reactions occurring during operation are reversible. Electrolyte is usually an organic volatile liquid with obvious corrosiveness. Once the electrolyte leaks, it will not only seriously endanger human health and safety, but may even cause the battery to spontaneously combust and cause explosions and fire accidents. Therefore, how to effectively prevent electrolyte leakage is an issue that needs to be considered urgently in the battery manufacturing process.

[0003] At present, for square shell batteries, laser welding is usually used to seal the top cover and shell of the battery to achieve the purpose of reliable packaging of the electrolyte. However, the laser welding sealing process seals the top cover and shell, and the internal stress cannot be released in time during high-temperature cooling. The subsequent slow release of stress can easily lead to material cracking, resulting in sealing failure, and the cost of the laser welding process is high. Summary of the invention

[0004] Based on this, it is necessary to provide an energy storage device monomer, an energy storage device module, an energy storage device and an electrical device to address the problems of high sealing cost and low sealing reliability.

[0005] On the one hand, the present application provides an energy storage device monomer, which includes:

[0006] A shell, wherein the shell has a top opening, and a first groove is provided on an outer wall of the shell near the top opening;

[0007] A top cover, the top cover is arranged at the top opening, a top surface of the top cover facing away from the shell is provided with a second groove, and the second groove is arranged around the periphery of the top cover; and,

[0008] A sealing member, wherein the sealing member is formed by injection molding on the periphery of the top surface of the top cover away from the shell and the outer periphery of the top end of the shell, and the sealing member is tightly fitted with the top cover and the top end of the shell, and the sealing member comprises a first combination body and a second combination body, wherein the first combination body is formed in the first groove, and the second combination body is formed in the second groove;

[0009] The sealing member is provided with an avoidance through hole, and the top cover is provided with a functional component, and the functional component is arranged in alignment with the avoidance through hole so that the functional component is exposed in the avoidance through hole.

[0010] When manufacturing the energy storage device monomer of the present solution, after placing the top cover at the top opening of the shell, the two are placed together in the injection mold, and then the molten plastic is injected into the injection mold, so that the molten plastic fully and evenly contacts the top surface periphery of the top cover and the top outer periphery of the shell, so that when the plastic is cooled and solidified, the top cover, the seal and the shell can be formed into an integral structure of injection molding. At this time, the seal forms an effective and tight fit with the top cover and the shell, thereby realizing the sealed assembly of the top cover and the shell, and at this time, the first combination of the seal is combined with the first groove, and the second combination is combined with the second groove, which improves the connection strength between the seal and the top cover and the shell. While improving the firmness, it also further increases the sealing of the connection, realizes the lasting and reliable sealing of the energy storage device monomer after processing and forming, and prevents the leakage of electrolyte inside the shell from causing personal injury and explosion accidents; and the avoidance through holes arranged on the seal can also accommodate the functional components on the top cover arranged in the opposite position, so that the functional components are normally exposed and avoid being blocked, ensuring the subsequent normal connection; in this way, compared with the existing welding sealing process, the seal of this scheme adopts the injection molding process to seal the top cover and the shell, the sealing process cost is greatly reduced, and there will be no problem of material cracking caused by stress release, eliminating the potential hidden dangers of sealing failure.

[0011] The technical solution of this application is further described below:

[0012] In one embodiment, one side of the groove wall of the second groove is set as an inclined wall, so that the groove width of the second groove is smaller than the groove bottom width, and the second combination body has an inclined surface portion adapted to the inclined wall, and the inclined surface portion is buckled with the inclined wall. The inclined wall forms a limiting and fixing effect on the second combination body, so that the second combination body is not easy to fall out of the second groove, and the reliability of the connection between the top cover and the sealing member is further improved.

[0013] In one embodiment, the groove walls on opposite sides of the second groove are both configured as inclined walls, so that the groove width of the second groove is smaller than the groove bottom width, and the second combination has two inclined portions arranged opposite to each other, and the inclined portions are buckled with the inclined walls in a one-to-one correspondence. This further enhances the restraint force of the second groove on the second combination, improves the adhesion between the top cover and the seal, and prevents the top cover and the seal from separating and falling off, thereby affecting the sealing ability of the internal battery cell and electrolyte.

[0014] In one embodiment, the top surface of the top cover is further provided with a first texture structure, the sealing member includes a main body, and the first texture structure is integrally formed with the main body. The friction force at the connection between the top cover and the sealing member is increased, and the roughening treatment process can significantly improve the adhesion between the metal part (top cover and shell) and the plastic part (seal), so as to avoid the sealing performance of the battery cell and electrolyte being affected by the separation of the seal from the top cover and / or shell due to the external force and its own expansion and contraction force during the subsequent installation and use of the energy storage device.

[0015] In one embodiment, the outer peripheral wall at the top of the shell is also provided with a second texture structure, and the seal also includes an annular portion connected to the main body and extending toward the bottom of the shell, and the second texture structure is sealed and engaged with the annular portion. The friction force at the connection between the shell and the seal is increased, and the use of this roughening process can significantly improve the adhesion between the metal parts (top cover and shell) and the plastic parts (seal), so as to avoid the seal and the top cover and / or shell being separated due to external force and its own expansion and contraction force during the subsequent installation and use of the energy storage device, thereby affecting the sealing performance of the battery cell and electrolyte.

[0016] In one embodiment, the top of the shell is used to surround the top opening to form a flared structure, so as to facilitate the installation of the battery cell into the installation cavity of the shell and avoid the battery cell being damaged by scratches between the battery cell and the shell when the battery cell is installed into the shell.

[0017] In one embodiment, the thickness of the seal is in the range of 0.8 mm to 2.5 mm, so that the seal can form sufficient bonding strength with the top cover and the shell, while preventing the seal from being too thick, which would cause too large a gap when assembling the energy storage device monomers.

[0018] In one embodiment, the functional components on the top cover include a positive electrode column, a negative electrode column and a liquid injection hole, the avoidance through hole includes a positive electrode column through hole, a negative electrode column through hole and a liquid injection through hole, and the sizes of the positive electrode column through hole, the negative electrode column through hole and the liquid injection through hole are respectively larger than the sizes of the corresponding positive electrode column, the negative electrode column and the liquid injection hole on the top cover. In this way, interference with the mold during injection molding can be avoided.

[0019] In one embodiment, the distance between the edge of the avoidance through hole and the edge of the top cover is greater than 2 mm. In this way, it is convenient to set a stopper on the mold, thereby avoiding glue overflow during injection molding and causing defective injection molding products.

[0020] On the other hand, the present application also proposes an energy storage device module, which includes the energy storage device monomer described above.

[0021] In addition, the present application also proposes an energy storage device, which includes the energy storage device module as described above.

[0022] Finally, the present application also proposes an electrical device, which includes the energy storage device as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application.

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. 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 these drawings without creative work.

[0025] FIG1 is a schematic structural diagram of a single energy storage device according to an embodiment of the present application.

[0026] FIG2 is a top view of the structure of FIG1;

[0027] Figure 3 It is a cross-sectional structural diagram at AA in Figure 2.

[0028] Figure 4 for Figure 3 A local enlarged structural diagram of point B in the middle.

[0029] Figure 5 This is an exploded structural diagram of the energy storage device monomer in Figure 1.

[0030] Figure 6 It is a schematic structural diagram of an energy storage device monomer in another embodiment in which the shell is provided with a second pattern.

[0031] Figure 7 It is a schematic diagram of the partial structure of the second groove arranged on the top cover.

[0032] Description of reference numerals:

[0033] 100. Energy storage device monomer; 10. Shell; 11. Top opening; 12. First groove; 13. Second texture structure; 14. Expanding structure; 20. Top cover; 21. Second groove; 211. Inclined wall; 30. Sealing member; 31. First combination; 32. Second combination; 321. Inclined portion; 33. Main body; 331. Avoidance through hole; 34. Ring portion; 40. Pole; 50. Liquid injection hole; 60. Explosion-proof valve. DETAILED DESCRIPTION

[0034] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0035] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply 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.

[0036] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0037] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated 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, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0038] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0039] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0040] See Figures 1 to Figure 3 ,as well as Figure 5 , is an energy storage device monomer 100 shown in an embodiment of the present application, which can be specifically a square shell lithium battery. Exemplarily, the energy storage device monomer 100 includes a shell 10, a top cover 20 and a seal 30. In addition, the energy storage device monomer 100 should also include at least a battery cell and an electrolyte.

[0041] The housing 10 has a top opening 11, and an installation cavity is formed inside the housing 10. When the energy storage device monomer 100 is assembled and manufactured, the battery cell and the electrolyte are loaded into the installation cavity through the top opening 11, and then the top cover 20 is placed above the top opening 11, and finally the top cover 20 is sealed and connected to the housing 10 with the help of the sealing member 30, so as to achieve the purpose of encapsulating the battery cell and the electrolyte, and thus the finished energy storage device monomer 100 can be obtained.

[0042] Please continue reading Figure 3 and Figure 4 A first groove 12 is provided at a portion of the outer wall of the shell 10 near the top opening 11, and the top cover 20 is arranged at the top opening 11. A second groove 21 is provided on the top surface of the top cover 20 facing away from the shell 10, and the second groove 21 is arranged around the periphery of the top cover 20; a sealing member 30 is formed by an injection molding process on the periphery of the top surface of the top cover 20 facing away from the shell 10 and the outer periphery of the top end of the shell 10, and the sealing member 30 is tightly fitted with the top cover 20 and the top end of the shell 10, and the sealing member 30 includes a first combination body 31 and a second combination body 32, the first combination body 31 is formed in the first groove 12, and the second combination body 32 is formed in the second groove 21.

[0043] Optionally, the first groove 12 may be a continuous annular groove surrounding the outer circumference of the housing 10, or may be a discontinuous annular groove composed of multiple grooves arranged at intervals along the outer circumference of the housing 10. For example, in this embodiment, the first groove 12 is a continuous annular groove arranged around a circle, which is not only convenient for processing (such as rolling, stamping, etc.), but also helps to increase the combination area with the first combination body 31, thereby enhancing the connection strength and sealing.

[0044] Further optionally, the cross-section of the first groove 12 may be U-shaped, C-shaped, inverted trapezoidal, etc., which may be selected according to actual needs.

[0045] The second groove 21 formed on the top surface of the top cover 20 can also be pre-processed by rolling, stamping, etc. The size, shape and other parameters of the second groove 21 can be flexibly designed according to actual needs, but should not affect the structural strength of the top cover 20 and should not occupy the arrangement and installation of functional components on the top cover 20.

[0046] In summary, the implementation of the technical solution of this embodiment will have the following beneficial effects: when the energy storage device monomer 100 of this solution is manufactured, the top cover 20 is placed at the top opening 11 of the shell 10, and then the two are placed together in the injection mold, and then molten plastic is injected into the injection mold, so that the molten plastic fully and evenly contacts the top surface periphery of the top cover 20 and the top outer periphery of the shell 10, so that when the plastic is cooled and solidified, the top cover 20, the sealing member 30 and the shell 10 can be formed into an integral structure of injection molding. At this time, the sealing member 30 and the top cover 20 are The top cover 20 and the housing 10 are effectively and tightly fitted, thereby achieving sealed assembly of the top cover 20 and the housing 10, and at this time, the first combination body 31 of the seal 30 is combined with the first groove 12, and the second combination body 32 is combined with the second groove 21, which improves the connection strength and firmness between the seal 30 and the top cover 20 and the housing 10 while further increasing the connection sealing, thereby achieving durable and reliable sealing of the energy storage device monomer 100 after processing and molding, and preventing the electrolyte inside the housing 10 from leaking and causing personal injury and explosion accidents.

[0047] Moreover, compared with the existing welding sealing process, the sealing member 30 of this solution is sealed and connected with the top cover 20 and the shell 10 by injection molding process, which greatly reduces the sealing process cost and does not cause the problem of material cracking due to stress release, thereby eliminating the potential hidden danger of sealing failure.

[0048] It can be understood that the first combination body 31 formed in the first groove 12 and the second combination body 32 formed in the second groove 21 are solids formed by the molten fluid plastic flowing into the first groove 12 and the second groove 21 during the injection molding process and cooling and solidifying. Therefore, the first combination body 31 and the first groove 12, as well as the second combination body 32 and the second groove 21 are tightly combined and tightly bonded, so that the top cover 20 and the seal 30, as well as the seal 30 and the shell 10 obtain better connection reliability and sealing performance.

[0049] Optionally, the material of the sealing member 30 may be any one of PP, ABS, PET, PE, PVC, etc., and the material may be selected according to actual needs.

[0050] Please continue reading Figure 4 and Figure 7 In some optional embodiments, one side wall of the second groove 21 is set as an inclined wall 211, so that the groove width of the second groove 21 is smaller than the groove bottom width, and the second combination body 32 has an inclined portion 321 adapted to the inclined wall 211, and the inclined portion 321 is buckled with the inclined wall 211.

[0051] Since one side wall of the second groove 21 is configured as an inclined wall 211, and the inclined wall 211 is adapted to fit with the inclined portion 321 of the second combining body 32, the inclined wall 211 forms a limiting and fixing effect on the second combining body 32, making it difficult for the second combining body 32 to escape from the second groove 21, thereby further improving the reliability of the connection between the top cover 20 and the sealing member 30.

[0052] Furthermore, the second groove 21 can be designed to have an inverted trapezoidal cross section, that is, at this time, the groove walls on the opposite sides of the second groove 21 are both set as inclined walls 211, and the two inclined walls 211 are both inclined toward the groove center direction of the second groove 21 so that the groove width of the second groove 21 is smaller than the groove bottom width, and the second combination 32 has two inclined surface parts 321 arranged oppositely, and the inclined surface parts 321 are buckled with the inclined walls 211 in a one-to-one correspondence. In this way, the restraint force of the second groove 21 on the second combination 32 is further enhanced, the bonding force between the top cover 20 and the sealing member 30 is improved, and the top cover 20 and the sealing member 30 are prevented from being separated and falling off, thereby affecting the sealing ability of the internal battery cell and electrolyte.

[0053] Of course, in other embodiments, in order to achieve the purpose of improving the connection strength and firmness between the second groove 21 and the second combination body 32, ratchets can be set on the groove wall of the second groove 21, and the ratchets can engage with the surface of the second combination body 32; or corresponding positioning holes and positioning protrusions can be respectively set on the groove wall of the second groove 21 and the surface of the second combination body 32, and the positioning protrusions can be inserted into the positioning holes, etc., and specific flexible selection can be made according to actual needs.

[0054] Please continue reading Figure 6 In addition, based on any of the above embodiments, the top surface of the top cover 20 is further provided with a first texture structure, the sealing member 30 includes a main body 33, and the first texture structure is integrally formed with the main body 33. At the same time, the top peripheral wall of the housing 10 is further provided with a second texture structure 13, and the sealing member 30 also includes an annular portion 34 connected to the main body 33 and extending toward the bottom of the housing 10, and the second texture structure 13 is integrally formed with the annular portion 34.

[0055] The first texture structure and the second texture structure 13 can respectively increase the friction between the top cover 20 and the seal 30 and between the shell 10 and the seal 30. The roughening process can significantly improve the adhesion between the metal part (top cover 20 and shell 10) and the plastic part (seal 30), so as to avoid the seal 30 being separated from the top cover 20 and / or shell 10 due to external force and its own expansion and contraction force during the subsequent installation and use of the energy storage device monomer 100, thereby affecting the sealing performance of the battery cell and the electrolyte.

[0056] Please continue to refer to Figure 1 and Figure 5 The main body 33 of the seal 30 is specifically a rectangular portion bonded to the top surface of the top cover 20. In some optional embodiments, the main body 33 is provided with an avoidance through hole 331, and the top cover 20 is provided with a functional component, which is arranged in alignment with the avoidance through hole 331 so that the functional component is exposed in the avoidance through hole 331.

[0057] Furthermore, in some optional embodiments, the top of the shell 10 is formed with a flared structure 14 at the portion surrounding the top opening 11. It can be understood that by designing the flared structure 14, it is convenient to install the battery cell into the installation cavity of the shell 10, and it is avoided that the battery cell is scratched by the shell 10 when the battery cell is inserted into the shell, thereby preventing the battery cell from being damaged.

[0058] In addition, the thickness of the seal 30 in the present application ranges from 0.8 mm to 2.5 mm, so that the seal 30 can form sufficient bonding strength with the top cover 20 and the housing 10, while preventing the seal 30 from being too thick, which would cause too large a gap when assembling the energy storage device monomer 100.

[0059] Further, in the present application, the functional components on the top cover 20 include a positive electrode column 40, a negative electrode column 40 and a liquid injection hole 50, and the avoidance through hole 331 includes a positive electrode column through hole, a negative electrode column through hole and a liquid injection through hole, and the sizes of the positive electrode column through hole, the negative electrode column through hole and the liquid injection through hole are respectively larger than the sizes of the positive electrode column 40, the negative electrode column 40 and the liquid injection hole 50 on the corresponding top cover 20. In this way, interference with the mold during injection molding can be avoided.

[0060] It is necessary to point out that functional components also include explosion-proof valves, identification codes, etc.

[0061] Furthermore, the distance between the edge of the through hole 331 and the edge of the top cover 20 is greater than 2 mm. In this way, it is convenient to set a stopper on the mold, thereby avoiding overflow of glue during injection molding and causing defective injection molding products.

[0062] In addition to the above, the present application also proposes an electricity-consuming device, which includes an electricity-consuming body and an energy storage device, and the electricity-consuming body is connected to the energy storage device by wires.

[0063] Among them, the electrical devices can be in various forms, for example, mobile phones, portable devices, laptops, battery vehicles, electric cars, ships, spacecraft, electric toys and electric tools, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers.

[0064] In addition, the energy storage device includes an energy storage device module, and the energy storage device module includes an energy storage device monomer 100 as described in any of the above embodiments.

[0065] The energy storage device monomer 100 may include a lithium-ion secondary energy storage device, a lithium-ion primary energy storage device, a lithium-sulfur energy storage device, a sodium-lithium-ion energy storage device, a sodium-ion energy storage device, or a magnesium-ion energy storage device, etc., which is not limited in the embodiments of the present application. The energy storage device monomer 100 may be cylindrical, flat, rectangular, or in other shapes, etc., which is not limited in the embodiments of the present application. According to the different packaging methods, the energy storage device monomer 100 is generally divided into three types: cylindrical energy storage devices, square energy storage devices, and soft-pack energy storage devices.

[0066] The energy storage device module mentioned in the embodiments of the present application refers to a single physical module including one or more energy storage device monomers 100 to provide higher voltage and capacity. The energy storage device module generally includes a box for encapsulating one or more energy storage device monomers 100, and the box can prevent liquid or other foreign matter from affecting the charging or discharging of the energy storage device monomers 100.

[0067] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0068] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A single energy storage device, characterized in that: include: A shell, wherein the shell has a top opening, and a first groove is provided on an outer wall of the shell near the top opening; A top cover, the top cover is arranged at the top opening, a top surface of the top cover facing away from the shell is provided with a second groove, and the second groove is arranged around the periphery of the top cover; A sealing member, wherein the sealing member is formed by injection molding on the periphery of the top surface of the top cover away from the shell and the outer periphery of the top end of the shell, and the sealing member is tightly fitted with the top cover and the top end of the shell, and the sealing member comprises a first combination body and a second combination body, wherein the first combination body is formed in the first groove, and the second combination body is formed in the second groove; The sealing member is provided with an avoidance through hole, and the top cover is provided with a functional component, and the functional component is arranged in alignment with the avoidance through hole so that the functional component is exposed in the avoidance through hole.

2. The energy storage device monomer according to claim 1, characterized in that: One side groove wall of the second groove is set as an inclined wall, so that the groove width of the second groove is smaller than the groove bottom width, and the second combination body has an inclined portion adapted to the inclined wall, and the inclined portion is buckled with the inclined wall.

3. The energy storage device monomer according to claim 1, characterized in that: The groove walls on opposite sides of the second groove are both configured as inclined walls so that the groove width of the second groove is smaller than the groove bottom width. The second combination body has two inclined portions arranged opposite to each other, and the inclined portions are buckled with the inclined walls in a one-to-one correspondence.

4. The energy storage device monomer according to claim 1, characterized in that: The top surface of the top cover is also provided with a first texture structure, the sealing component includes a main body, and the first texture structure is integrally formed with the main body.

5. The energy storage device monomer according to claim 4, characterized in that: The top peripheral wall of the shell is also provided with a second texture structure, and the sealing member also includes an annular portion connected to the main body and extending toward the bottom direction of the shell, and the second texture structure is integrally formed with the annular portion.

6. The energy storage device monomer according to claim 1, characterized in that: The top end of the shell is used to surround the top end opening to form a flared structure.

7. The energy storage device monomer according to claim 1, characterized in that: The thickness of the sealing member ranges from 0.8 mm to 2.5 mm.

8. The energy storage device monomer according to claim 1, characterized in that: The functional components on the top cover include a positive electrode column, a negative electrode column and an injection hole, the avoidance through hole includes a positive electrode column through hole, a negative electrode column through hole and an injection through hole, and the sizes of the positive electrode column through hole, the negative electrode column through hole and the injection through hole are respectively larger than the sizes of the corresponding positive electrode column, negative electrode column and injection hole on the top cover.

9. The energy storage device monomer according to claim 1, characterized in that: The distance between the edge of the avoidance through hole and the edge of the top cover is greater than 2 mm.

10. An energy storage device module, characterized in that: It comprises an energy storage device monomer as described in any one of claims 1 to 9.

11. An electrical device, characterized in that: Comprising the energy storage device module as claimed in claim 10.

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