Top cover assembly, battery monomer, energy storage equipment and power utilization device

Abstract

The utility model relates to a top cover assembly, a battery monomer, energy storage equipment and an electric device. The top cover assembly comprises a cover plate, the pole is arranged on the cover plate; the pole column is connected with the connecting sheet and is used for being connected with the battery core through the connecting sheet; the sealing ring is arranged between the pole and the cover plate in a sealing manner; the sealing ring comprises an inner ring and an outer ring connected to the outer portion of the inner ring in a sleeving mode, the inner ring is a rubber part, and the outer ring is made of a solid-solid phase change material. As the outer ring is made of the solid-solid phase change material, when the battery is subjected to an external short-circuit test and the connecting sheet generates a large amount of high-temperature heat, and the high-temperature heat is conducted to the sealing ring, the temperature of the sealing ring can be obviously reduced through the phase change of the material of the outer ring, namely, the heat resistance of the sealing ring is improved; therefore, the sealing performance of the battery is ensured, the problems of smoking, liquid leakage and the like of the battery caused by the failure of the sealing ring are avoided, and the use safety and reliability of the battery are improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to a top cover assembly, a battery cell, an energy storage device, and an electrical device. Background Art

[0002] As a secondary battery with development potential, lithium ion cells and batteries have been widely used in many fields such as electric vehicles, portable electronic devices, and energy storage due to their advantages of long cycle life, high specific energy, low self-discharge, and high energy efficiency. With the wide application of lithium ion batteries in different fields, the safety performance of lithium ion batteries has become the most concerned performance index for users. During the production and assembly of batteries, a sealing ring is located between the battery cover plate and the pole column to prevent the leakage of electrolyte, ensuring good sealing inside the battery and providing an important guarantee for the life and safety of the battery.

[0003] The battery will undergo an external short-circuit test. During the test, the short-circuit current will reach more than 2000 A before the connecting piece melts, resulting in a large amount of heat generated at the internal parts of the battery such as the tab, the connecting piece, and the pole column. However, after these high-temperature heats are conducted to the lower plastic, the sealing ring, and the upper plastic, it may cause the connecting piece to not melt yet, and the corresponding structural parts have already failed due to high temperature. Among them, the failure of the sealing ring will cause the battery to smoke / leak liquid, affecting the safe use of the battery. Summary of the Utility Model

[0004] Based on this, in view of the problem that the sealing performance of the sealing ring fails due to high temperature, affecting the safe use of the battery, it is necessary to provide a top cover assembly, a battery cell, an energy storage device, and an electrical device.

[0005] In the first aspect of the present application, a top cover assembly is provided, which includes: [[ID=!21]]

[0006] A cover plate;

[0007] A pole column, which is arranged on the cover plate;

[0008] A connecting piece, which is connected to the pole column and is used to connect to the battery cell through the connecting piece; and

[0009] A sealing ring, which is hermetically arranged between the pole column and the cover plate; wherein, the sealing ring includes an inner ring and an outer ring sleeved on the outside of the inner ring; wherein, the inner ring is a rubber part, the outer ring is made of a solid-solid phase change material, and / or, the outer ring is a rubber part, and the inner ring is made of a solid-solid phase change material.

[0010] For the top cover assembly of this solution, a pole is installed on the cover plate, so that the pole is connected to the adapter plate, and then connected to the battery cell through the adapter plate, enabling the battery cell to charge and discharge the battery through the pole. During this process, a sealing ring is installed between the cover plate and the pole, and the sealing ring is designed with a combined structure of an inner ring and an outer ring. Since the inner ring and / or the outer ring are rubber parts, during the normal charging and discharging operation of the battery, the battery is in a reasonable heating state, and the heat conducted from the battery cell to the sealing ring through the connecting piece is normal, enabling the inner ring and / or the outer ring of the rubber part to ensure the airtight effect on the battery cell and prevent the electrolyte inside the battery cell from leaking from the assembly position of the cover plate and the pole. Further, since the inner ring and / or the outer ring are made of solid-solid phase change materials, when the battery undergoes an external short-circuit test, resulting in a large amount of high-temperature heat generated by the connecting piece, when the high-temperature heat is conducted to the sealing ring, the temperature of the sealing ring can be significantly reduced by the phase change of the inner ring and / or the outer ring materials to absorb heat, that is, the heat resistance of the sealing ring is improved, preventing the sealing ring from failing before the connecting piece melts due to high-temperature heat, thereby ensuring the sealing performance of the battery and avoiding problems such as the battery smoking and leaking liquid due to the failure of the sealing ring, and improving the safety and reliability of battery use.

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

[0012] In one embodiment, the sealing ring further includes a high-temperature resistant adhesive material, and the high-temperature resistant adhesive material is clamped between the outer peripheral wall of the inner ring and the inner peripheral wall of the outer ring. The inner ring is adhesively fixed to the outer ring through the high-temperature resistant adhesive material, which can improve the overall structural strength of the composite structure sealing ring.

[0013] In one embodiment, an annular groove is recessed on the inner peripheral wall of the outer ring, and the inner ring is embedded in the annular groove. By means of the groove wall of the annular groove, the inner ring is clamped tightly, thereby further improving the firmness of the assembly of the inner ring and the outer ring, and avoiding the separation and shedding of the inner ring and the outer ring during long-term repeated thermal expansion and contraction changes.

[0014] In one embodiment, one of the outer peripheral wall of the inner ring and the inner peripheral wall of the outer ring is provided with a clamping protrusion, and the other of the outer peripheral wall of the inner ring and the inner peripheral wall of the outer ring is provided with a clamping groove, and the clamping protrusion is clamped in the clamping groove. By means of the clamping structure formed by the clamping protrusion and the clamping groove, the inner ring and the outer ring can be assembled and fixed together as a whole through partial combination.

[0015] In one embodiment, the connecting piece includes a main body portion, a first connecting portion, and at least one second connecting portion. The first connecting portion and the second connecting portion are disposed at intervals on the outer periphery of the main body portion. Among them, a first welding mark is provided on the first connecting portion, and a second welding mark is provided on the second connecting portion. During the charging and discharging process, electrons move linearly from the second welding mark to the first welding mark along the electron transmission path. This helps to avoid excessive current density in some areas of the connecting piece.

[0016] In one embodiment, the connecting piece further includes an overcurrent portion, and the overcurrent portion is connected between the first connecting portion and the main body portion. Large current converges in the overcurrent portion so that the connecting piece can be quickly fused, that is, the time required for the connecting piece to fuse is shortened, enabling the connecting piece to fuse before the sealing ring fails due to high temperature, ensuring the safety performance of the battery cell.

[0017] In one embodiment, the width range of the overcurrent portion is: 10 mm to 20 mm.

[0018] In a second aspect of the present application, there is also provided a battery cell monomer, which includes:

[0019] A housing;

[0020] A battery cell, the battery cell is disposed in the housing, and the tab of the battery cell is connected to the connecting piece; and

[0021] The top cover assembly as described above, the top cover assembly is sealingly connected to the inlet and outlet of the housing, and the terminal post is connected to the connecting piece.

[0022] In a third aspect of the present application, there is also provided an energy storage device, which includes the battery cell monomer as described above.

[0023] In a fourth aspect of the present application, there is also provided an electrical device, which includes:

[0024] An electrical main body; and

[0025] The energy storage device as described above, the energy storage device is electrically connected to the electrical main body. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings constituting a part of this application are used to provide a further understanding of this application. The schematic embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation to this application.

[0027] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0028] Figure 1 It is an exploded structural schematic diagram of the top cover assembly in the battery cell described in an embodiment.

[0029] Figure 2 It is a top view structural schematic diagram of the sealing ring in an embodiment.

[0030] Figure 3 For Figure 2 The sectional structural schematic diagram at A-A in

[0031] Figure 4 It is a structural schematic diagram in which the inner ring is fitted into the annular groove of the outer ring in an embodiment.

[0032] Figure 5 It is a structural schematic diagram in which the inner ring and the outer ring are assembled and fixed by snap connection of the snap protrusion and the snap groove in another embodiment.

[0033] Figure 6 It is a top view structural schematic diagram of the connecting piece in an embodiment.

[0034] Explanation of reference numerals:

[0035] 100, battery cell; 10, top cover assembly; 11, cover plate; 12, pole post; 13, connecting piece; 131, main body part; 132, first connecting part; 132a, first welding mark; 133, second connecting part; 133a, second welding mark; 134, overcurrent part; 14, sealing ring; 141, inner ring; 141a, snap protrusion; 142, outer ring; 142a, annular groove; 142b, snap groove; 143, high-temperature resistant adhesive material; 15, explosion-proof valve; 16, upper plastic; 17, lower plastic; 20, battery core; 21, tab. Detailed embodiments

[0036] To make the above objects, features, and advantages of the present application more obvious and understandable, the following will give a detailed description of the specific embodiments of the present application with reference to the accompanying drawings. Many specific details are set forth in the following description to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein. Those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0037] In the description of the present application, it should be understood that if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the drawings. These 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. Therefore, it should not be construed as a limitation to the present application.

[0038] In addition, if there are terms such as "first" and "second", these terms are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, if there is a term "plurality", the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0039] In the present application, unless otherwise clearly specified and limited, if there are terms such as "mounted", "connected", "connected to", "fixed", etc., these terms should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0040] In the present application, unless otherwise clearly specified and limited, if there is a description such as a first feature being "above" or "below" a second feature, the meaning may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "below", "under" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0041] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. If present, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are only for illustrative purposes and do not represent the only implementation.

[0042] Refer to Figure 1 , which is an exploded schematic view of a top cover assembly 10 shown in an embodiment of the present application, and includes components such as a cover plate 11, a terminal post 12, a connecting piece 13, a sealing ring 14, an upper plastic 16, a lower plastic 17, an explosion-proof valve 15, etc.

[0043] Among them, the terminal post 12 is disposed on the cover plate 11. Specifically, there are two terminal posts 12, namely a positive terminal post and a negative terminal post. The cover plate 11 is provided with two through holes, and the positive terminal post and the negative terminal post are respectively inserted and installed in a corresponding through hole, and the lengths of the positive terminal post and the negative terminal post are greater than the depth of the through hole, so that one axial end of the two terminal posts 12 extends below the lower surface of the cover plate 11, and the other axial end extends above the upper surface of the cover plate 11 to facilitate subsequent connection.

[0044] For example, the terminal post 12 is connected to the connecting piece 13 and is used to connect to the battery cell 20 through the connecting piece 13. That is, one end of the terminal post 12 that extends below the lower surface of the cover plate 11 is connected to the connecting piece 13, and the connection method can be any one of welding, riveting, bonding, etc.

[0045] It is easy to understand that there are also two connecting pieces 13, namely a positive connecting piece and a negative connecting piece. The positive connecting piece is dedicated to connecting the positive terminal post to the positive tab 21 of the battery cell 20, and the negative connecting piece is dedicated to connecting the negative terminal post to the negative tab 21 of the battery cell 20.

[0046] The sealing ring 14 is hermetically disposed between the terminal post 12 and the cover plate 11 to prevent the electrolyte inside the battery cell 20 from leaking from the assembly gap between the through hole wall of the terminal post 12 and the cover plate 11.

[0047] Please continue to refer to Figure 2 and Figure 3 , in particular, in this application, the sealing ring 14 includes an inner ring 141 and an outer ring 142 sleeved on the outside of the inner ring 141. The inner ring 141 is made of a rubber part, and the outer ring 142 is made of a solid-solid phase change material; and / or, the outer ring 142 is a rubber part, and the inner ring 141 is made of a solid-solid phase change material.

[0048] For example, the outer ring 142 is clamped outside the inner ring 141 by interference fit to ensure the stable assembly of the two. Both the inner ring 141 and the outer ring 142 are circular rings. The dimensions of the inner ring 141 are an inner diameter of 15 mm, an outer diameter of 18 mm, and a thickness of 1.2 mm. The dimensions of the outer ring 142 are an inner diameter of 18 mm, an outer diameter of 20 mm, and a thickness of 1.2 mm.

[0049] In addition, the material of the rubber part can specifically be but is not limited to fluororubber. The specific types of the solid-solid phase change material can be but are not limited to pentaerythritol, neopentyl glycol, trimethylolethane, high-density polyethylene, etc.

[0050] In summary, implementing the technical solution of this embodiment will obtain the following beneficial effects: In the top cover assembly 10 of this solution, the pole post 12 is installed on the cover plate 11, so that the pole post 12 is connected to the adapter plate, and then connected to the battery cell 20 through the adapter plate, realizing that the battery cell 20 charges and discharges the battery through the pole post 12. During this process, a sealing ring 14 is installed between the cover plate 11 and the pole post 12, and the sealing ring 14 is designed with a combined structure of an inner ring 141 and an outer ring 142. Since the inner ring 141 and / or the outer ring 142 are rubber parts, during the normal charging and discharging operation of the battery, the battery is in a reasonable heating state, and the heat conducted from the battery cell 20 to the sealing ring 14 through the connecting piece 13 is normal, so that the inner ring 141 and / or the outer ring 142 of the rubber part can ensure the airtight effect on the battery cell 20 and prevent the electrolyte inside the battery cell 20 from leaking from the assembly part of the cover plate 11 and the pole post 12; further, since the inner ring 141 and / or the outer ring 142 are made of solid-solid phase change material, when the battery conducts an external short-circuit test, resulting in a large amount of high-temperature heat generated by the connecting piece 13, when the high-temperature heat is conducted to the sealing ring 14, the temperature of the sealing ring 14 can be significantly reduced by the phase change of the material of the inner ring 141 and / or the outer ring 142 absorbing heat, that is, the heat resistance of the sealing ring 14 is improved, preventing the sealing ring 14 from failing before the connecting piece 13 is melted by high-temperature heat, thereby ensuring the sealing performance of the battery and avoiding problems such as the battery smoking and leaking liquid due to the failure of the sealing ring 14, and improving the use safety and reliability of the battery.

[0051] It should also be noted that when performing an external short-circuit test, in addition to the connecting piece 13, the components that generate high-temperature heat inside the battery also include the tab 21, the pole post 12 and other components. In addition to the sealing ring 14, the components affected by high temperature due to heat conduction also include the lower plastic part 17, the upper plastic part 16 and other components.

[0052] Please continue to refer to Figure 2 and Figure 3, in addition, on the basis of the above embodiments, the sealing ring 14 further includes a high-temperature resistant adhesive material 143, and the outer peripheral wall of the inner ring 141 is adhesively fixed to the inner peripheral wall of the outer ring 142 through the high-temperature resistant adhesive material 143. The inner ring 141 is adhesively fixed to the outer ring 142 through the high-temperature resistant adhesive material 143, which can not only improve the overall structural strength of the composite structure sealing ring 14, but also when the battery undergoes an external short-circuit test, the high-temperature heat conducted from the connecting piece 13 will not damage the viscosity of the high-temperature resistant adhesive material 143, and still can ensure that the high-temperature resistant adhesive material 143 firmly bonds the inner ring 141 and the outer ring 142, improving the heat resistance of the sealing ring 14, enabling the outer ring 142 to reduce the temperature of the sealing ring 14 through material phase change, and ensuring that the sealing ring 14 will not fail before the connecting piece 13 melts.

[0053] For example, the high-temperature resistant adhesive material 143 is a high-temperature resistant adhesive, and the high-temperature resistant adhesive can specifically be, but is not limited to, any one of silicone rubber, epoxy resin adhesive, polyurethane adhesive, etc., and can be flexibly selected according to actual needs.

[0054] It should be noted that the working principle of the solid-solid phase change material is to store and release energy by using the latent heat released or absorbed during the phase change of the material. Applied to this solution, that is, the solid-solid phase change material can absorb the high-temperature heat conducted from the connecting piece 13 through material phase change, so as to reduce the overall temperature of the sealing ring 14. The phase change of the solid-solid phase change material can be a phase change of the crystal lattice structure or a phase change of a chemical reaction. In the solid state, this phase change can achieve high-density energy storage, and there will be no problems such as leakage and evaporation during the liquid phase change.

[0055] Please continue to refer to Figure 4 , in addition, on the basis of any of the above embodiments, an annular groove 142a is recessed on the inner peripheral wall of the outer ring 142, and the inner ring 141 is fitted into the annular groove 142a. By fitting the inner ring 141 into the annular groove 142a and clamping the inner ring 141 with the groove wall of the annular groove 142a, the firmness of the assembly of the inner ring 141 and the outer ring 142 can be further improved, and the separation and detachment of the inner ring 141 and the outer ring 142 during the long-term reciprocating thermal expansion and contraction changes can be avoided.

[0056] It should be noted that the inner ring 141 and the outer ring 142 can be adhesively fixed only through the high-temperature resistant adhesive material 143, or can be assembled and fixed only through the fitting structure, or can be assembled into one body through both the high-temperature resistant adhesive material 143 and the fitting structure at the same time, and can be flexibly selected according to actual needs.

[0057] In the above embodiments, it can be understood that the entire inner ring 141 is completely received in the annular groove 142a of the outer ring 142. At this time, the bonding area between the outer ring 142 and the inner ring 141 is large, the connection firmness is high, and the overall volume of the assembled components is smaller, occupying less installation space, which is more conducive to the miniaturization design of the top cover assembly 10. Or, as an alternative embodiment, please continue to refer to Figure 5 , in another embodiment, one of the outer peripheral wall of the inner ring 141 and the inner peripheral wall of the outer ring 142 is provided with a clamping projection 141a, and the other of the outer peripheral wall of the inner ring 141 and the inner peripheral wall of the outer ring 142 is provided with a clamping groove 142b, and the clamping projection 141a is clamped in the clamping groove 142b. For example, in the present application, the inner ring 141 is provided with a clamping projection 141a, and the outer ring is provided with a clamping groove 142b.

[0058] That is, by means of the clamping structure formed by the clamping projection 141a and the clamping groove 142b, the inner ring 141 and the outer ring 142 can be assembled and fixed into one body through partial bonding. Under this assembly structure, the diameter adjustment range of the sealing ring 14 is large, and it can be applied to the installation occasions with different sizes of assembly gaps formed by more cover plates 11 and pole columns 12, improving the application range of the sealing ring 14.

[0059] Of course, in this embodiment, in addition to clamping the inner ring 141 and the outer ring 142 through the clamping projection 141a and the clamping groove 142b, a high-temperature resistant adhesive can also be provided between the clamping projection 141a and the clamping groove 142b for auxiliary bonding.

[0060] In the present application, the connecting piece 13 is used to electrically connect the tab 21 of the battery cell 20 and the pole column 12, so that current can flow between the battery cell 20 and the pole column 12 through the connecting piece 13. For example, the connection method between the tab 21 of the battery cell 20 and the connecting piece 13 and the connection method between the pole column 12 and the connecting piece 13 can be any one of welding, bonding, etc.

[0061] Please continue to refer to Figure 6 , in one embodiment, the connecting piece 13 includes a main body portion 131, a first connecting portion 132 and at least one second connecting portion 133. The first connecting portion 132 and the second connecting portion 133 are spaced apart and arranged on the outer periphery of the main body portion 131. Preferably, in the present application, two second connecting portions 133 are provided, and the first connecting portion 132 and the two second connecting portions 133 are arranged in a triangular structure and connected to the outer periphery of the main body portion 131. The main body portion 131, the first connecting portion 132 and the second connecting portion 133 are arranged in the same plane.

[0062] Among them, a first welding mark 132a is provided on the first connecting portion 132, and a second welding mark 133a is provided on the second connecting portion 133. During the charge and discharge process, electrons move linearly between the second welding mark 133a and the first welding mark 132a along the electron transmission path, which is beneficial to avoiding excessive current density in some areas of the connecting piece 13. For example, the first welding mark 132a on the first connecting portion 132 is used to weld with the terminal 12, and the second welding mark 133a on the second connecting portion 133 is used to weld with the tab 21. During the charging process, electrons migrate from the inside to the external power supply, and the current enters the inside of the battery cell 20; during the discharging process, electrons flow from the load device through the terminal 12, the connecting piece 13, the tab 21 and enter the inside of the battery cell 20, and the current flows out from the inside for power supply.

[0063] Furthermore, the connecting piece 13 further includes an overcurrent portion 134, and the overcurrent portion 134 is connected between the first connecting portion 132 and the main body portion 131. During the normal temperature external short-circuit test of the battery, a large current converges in the overcurrent portion 134 so that the connecting piece 13 can be quickly melted, that is, the time required for the connecting piece 13 to melt is shortened, and the connecting piece 13 is melted before the sealing ring 14 fails due to high temperature, ensuring the safety performance of the battery cell 20.

[0064] It should be noted that the overcurrent portion 134 in the present application adopts a width reduction design. The above-mentioned width reduction design specifically means that the width value of the overcurrent portion 134 is smaller than the conventional design width value. For example, the conventional design width value of the overcurrent portion 134 is 22 mm, while the width value of the overcurrent portion 134 after adopting the width reduction design in the present application is 15 mm.

[0065] Specifically, the width range of the overcurrent portion 134 in the present application is: 10 mm to 20 mm. In this way, the overcurrent fusing requirements of the connecting piece 13 in each type of battery cell 100 can be met.

[0066] Alternatively, in order to meet the requirement that the connecting piece 13 can be quickly melted, the overcurrent portion 134 can also adopt a thickness reduction design. The thickness reduction design specifically means that the thickness of the overcurrent portion 134 is smaller than the thicknesses of the main body portion 131, the first connecting portion 132, and the second connecting portion 133. For example, the thicknesses of the main body portion 131, the first connecting portion 132, and the second connecting portion 133 are the same and are all 0.2 mm, and the thickness of the overcurrent portion 134 after adopting the thickness reduction design is 0.15 mm.

[0067] In the second aspect of the present application, a battery cell 100 is further provided, which includes a housing, a battery cell 20, and a top cover assembly 10 as described in any one of the above embodiments. The battery cell 20 is disposed in the housing, the connecting piece 13 is connected to the tab 21 of the battery cell 20; the top cover assembly 10 is hermetically connected to the inlet and outlet of the housing, and the terminal 12 is connected to the connecting piece 13.

[0068] In addition to the above, the present application also provides an electrical device, including an electrical main body and an energy storage device, where the electrical main body is electrically connected to the energy storage device. The energy storage device includes a battery module, and the battery module includes at least one battery cell 100.

[0069] The battery cell 100 may include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, a magnesium-ion battery, etc., and the embodiments of the present application do not limit this. The battery cell 100 may be in a cylindrical shape, a flat shape, a cuboid shape, or other shapes, etc., and the embodiments of the present application also do not limit this. According to different encapsulation methods, the battery cell 100 is generally divided into three types: cylindrical batteries, square batteries, and soft-pack batteries.

[0070] The battery module mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells 100 to provide a higher voltage and capacity. The battery module generally includes a box body for encapsulating one or more battery cells 100, and the box body can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells 100.

[0071] The electrical main body can be in various forms. For example, mobile phones, portable devices, laptop computers, battery cars, electric vehicles, ships, spacecrafts, electric toys, and electric tools, etc. For example, spacecrafts include airplanes, rockets, space shuttles, and spaceships, etc. Electric toys include fixed or mobile electric toys. For example, game consoles, electric vehicle 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. For example, electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact electric drills, concrete vibrators, and electric planers.

[0072] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as these technical feature combinations do not conflict, they should all be considered as within the scope described in this specification.

[0073] The above-described embodiments only represent several implementation manners of the present application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A top cover assembly, characterized in that, Comprising: Cover plate; Terminal post, the terminal post being disposed on the cover plate; Connecting piece, the terminal post being connected to the connecting piece and configured to be connected to the battery cell through the connecting piece; and Sealing ring, the sealing ring being sealingly disposed between the terminal post and the cover plate; wherein, the sealing ring includes an inner ring and an outer ring sleeved on the outside of the inner ring; wherein, the inner ring is a rubber part, and the outer ring is made of a solid-solid phase change material, and / or, the outer ring is a rubber part, and the inner ring is made of a solid-solid phase change material.

2. The top cover assembly according to claim 1, characterized in that The sealing ring further includes a high-temperature resistant adhesive material, and the high-temperature resistant adhesive material is clamped between the outer peripheral wall of the inner ring and the inner peripheral wall of the outer ring.

3. The top cover assembly according to claim 1 or 2, characterized in that, An annular groove is recessed on the inner peripheral wall of the outer ring, and the inner ring is fitted into the annular groove.

4. The top cover assembly according to claim 1 or 2, characterized in that, One of the outer peripheral wall of the inner ring and the inner peripheral wall of the outer ring is provided with a clamping protrusion, and the other of the outer peripheral wall of the inner ring and the inner peripheral wall of the outer ring is provided with a clamping groove, and the clamping protrusion is clamped in the clamping groove.

5. The top cover assembly according to claim 1, wherein, The connecting piece includes a main body portion, a first connecting portion and at least one second connecting portion, and the first connecting portion and the second connecting portion are spaced apart and disposed on the outer periphery of the main body portion; wherein, a first welding mark is provided on the first connecting portion, and a second welding mark is provided on the second connecting portion.

6. The top cover assembly according to claim 5, wherein The connecting piece further includes a current-carrying portion, and the current-carrying portion is connected between the first connecting portion and the main body portion.

7. The top cover assembly according to claim 6, wherein, The width range of the current-carrying portion is: 10 mm to 20 mm.

8. A battery cell, characterized in that, Comprising: Shell; Battery cell, the battery cell being disposed in the shell, and the tab of the battery cell being connected to the connecting piece; And The top cover assembly according to any one of claims 1 to 7, the top cover assembly being sealingly connected to the inlet and outlet of the shell, and the terminal post being connected to the connecting piece.

9. An energy storage device, characterized in that, Including the battery monomer according to claim 8.

10. An electrical device, characterized in that, Comprising: Electricity-consuming main body; And The energy storage device according to claim 9, the energy storage device being electrically connected to the electricity-consuming main body.

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