Valve assembly, battery cell, battery device and electric equipment

Abstract

The utility model relates to a valve assembly, a battery monomer, a battery device and electric equipment, the valve assembly comprises a valve body which is at least partially arranged in a liquid injection hole, the valve body is internally provided with a cavity, and the cavity is configured to be deformable to change the volume of the valve body; and the valve body is switched between a closed state of sealing the liquid injection hole and an open state of opening the liquid injection hole. The volume of the valve body is changed when the cavity of the valve body deforms, so that the valve body is switched between the closed state and the open state, and when the valve body is in the closed state, the liquid injection hole can be sealed, so that a sealed environment is formed in the battery monomer; when the valve body is in an open state, the liquid injection hole can be opened, so that electrolyte can be injected into the battery monomer through the liquid injection hole; therefore, the structure of the valve assembly is simpler, the liquid injection hole is opened and sealed through deformation of the inner cavity, operation is simpler and more convenient, and the operation efficiency can be effectively improved.

Description

Technical Field

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

[0002] During the battery production process, after the battery is assembled, electrolyte needs to be injected into the casing through the injection hole. This hole is then sealed after multiple steps. During this process, the injection hole needs to be opened and closed multiple times. Therefore, a switch valve is required to seal or open the injection hole. However, the current switch valve has a complex structure, making operation cumbersome. This complex structure also increases the failure rate of the switch valve, hindering operational efficiency. Utility Model Content

[0003] Based on this, it is necessary to provide a valve assembly, battery cell, battery device and electrical equipment to address the problem that the current switch valve has a relatively complex structure, which makes the operation cumbersome, and the complex structure also leads to an increased failure rate of the switch valve, which is not conducive to improving operational efficiency.

[0004] In a first aspect, the present application provides a valve assembly for sealing or opening a liquid injection hole of a battery cell. The valve assembly includes a valve body at least partially disposed in the liquid injection hole. The interior of the valve body has a cavity, and the cavity is configured to be deformable to change the volume of the valve body so that the valve body can switch between a closed state for sealing the liquid injection hole and an open state for opening the liquid injection hole.

[0005] Through the above structure, the valve assembly can achieve repeated sealing and unsealing of the injection hole, so as to facilitate multiple injections into the battery cell through the injection hole. In addition, the structure of the valve assembly is simpler, and the opening and sealing of the injection hole are achieved through the deformation of the inner cavity, which makes the operation easier and can effectively improve the operating efficiency.

[0006] In some embodiments, when the valve body is in a closed state, the volume of the valve body increases, and at least part of the outer surface of the valve body is sealed with the wall of the injection hole; when the valve body is in an open state, the volume of the valve body decreases, and a liquid gap is formed between the outer surface of the valve body and the wall of the injection hole.

[0007] Through the above structure, the sealing effect of the valve body on the liquid injection hole can be further improved, and the liquid injection hole can be opened smoothly in the open state.

[0008] In some embodiments, the valve body includes a main body portion and a sealing portion, the sealing portion is connected to the main body portion and is arranged around the outer periphery of the main body portion; the inner surface of the main body portion is connected to the inner surface of the sealing portion and together form the inner wall of the cavity, and the outer surface of the sealing portion is arranged to protrude from the outer surface of the main body portion; when the valve body is in a closed state, the outer surface of the sealing portion is sealed with the hole wall of the injection hole; when the valve body is in an open state, a liquid gap is formed between the outer surface of the sealing portion and the hole wall of the injection hole.

[0009] Thus, by providing the main body and the sealing portion, the outer surface of the valve body forms two areas with different heights, which can further improve the sealing stability during the process of sealing with the hole wall of the injection hole.

[0010] In some embodiments, the thickness of the sealing portion is smaller than that of the body portion. In this way, when the cavity expands, the elastic deformation of the sealing portion is greater, the valve body can maintain a relatively good external shape, and the sealing portion can be fully expanded, thereby improving the sealing effect.

[0011] In some embodiments, the sealing portion includes a plurality of sealing portions, each of which is spaced apart along the axial direction of the liquid injection hole. By providing a plurality of sealing portions, the sealing effect of the liquid injection hole can be further improved, making the sealing more stable.

[0012] In some embodiments, an arc-shaped connecting section is formed between the sealing portion and the main body, thereby reducing stress concentration at the edge of the sealing portion, making the sealing portion more evenly stressed and thus better able to deform to seal the injection hole.

[0013] In some embodiments, the valve body further includes an insertion portion, which is connected to the main body portion or the sealing portion located at the end of the valve body; wherein the insertion portion is inserted into the injection hole, and the outer diameter of the insertion portion gradually decreases along its own insertion direction.

[0014] In this way, the outer peripheral surface of the insertion portion is formed as a chamfered surface, so that the valve body can be better inserted into the liquid injection hole.

[0015] In some embodiments, a first opening connected to the cavity is further provided on the valve body, and the valve assembly further includes an air nozzle arranged at the first opening, which is used to fill the deformable medium into the cavity or extract the deformable medium from the cavity to switch the valve body between a closed state and an open state.

[0016] By providing the air nozzle, the cavity can be smoothly filled with a deformable medium or extracted from the cavity to change the volume of the cavity, so that the valve body can be smoothly switched between the closed state and the open state.

[0017] In some embodiments, the valve assembly further includes a switch valve disposed in the gas nozzle, and the switch valve is used to open or close the gas nozzle.

[0018] By setting a switch valve, the air nozzle can be smoothly opened or closed, so as to perform inflation or degassing operations on the cavity, and the volume of the cavity can be kept unchanged after the operation is completed, thereby achieving smooth sealing or opening of the liquid injection hole.

[0019] In a second aspect, the present application further provides a battery cell, comprising:

[0020] a housing having a second opening at one end;

[0021] A top cover is sealed at the second opening and encloses the housing to form a receiving cavity, and a liquid injection hole is formed through the top cover;

[0022] an electrode assembly disposed in the accommodating cavity; and

[0023] The valve assembly as described above is arranged in the liquid injection hole to seal or open the liquid injection hole.

[0024] In a third aspect, the present application also provides a battery device comprising the battery cell described above.

[0025] In a fourth aspect, the present application also provides an electrical device comprising the battery device as described above.

[0026] The above-mentioned valve assembly, battery cell, battery device and electrical equipment, at least part of the valve body is arranged in the injection hole of the battery cell, the volume of the valve body changes when its own cavity is deformed, and can switch between a closed state and an open state, wherein, when the valve body is in a closed state, it can seal the injection hole so that a sealed environment is formed inside the battery cell; and when the valve body is in an open state, it can open the injection hole to facilitate the injection of electrolyte into the battery cell through the injection hole; thereby, the structure of the valve assembly is simpler, and the opening and sealing of the injection hole are achieved by the deformation of the inner cavity, the operation is simpler, and the operating efficiency can be effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic structural diagram of a battery cell according to one or more embodiments.

[0028] Figure 2 Schematic diagram of a structure in which a valve assembly is disposed in a liquid injection hole of a battery cell according to one or more embodiments.

[0029] Figure 3 Schematic diagram of the structure of a valve assembly according to one or more embodiments.

[0030] Explanation of reference numerals: 100, battery cell; 101, liquid injection hole; 10, valve assembly; 11, valve body; 12, main body; 13, sealing part; 14, arc-shaped connecting section; 15, insertion part; 16, air nozzle; a, axial direction. DETAILED DESCRIPTION

[0031] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0032] In the description of this 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 this 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 this application.

[0033] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0034] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0035] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this 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. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0036] 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 an intermediate 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 an intermediate element. 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 embodiment.

[0037] Currently, market developments indicate that batteries are increasingly being used. They are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric cars, as well as in other fields. As battery applications continue to expand, market demand is also growing.

[0038] A battery cell is the smallest unit that makes up a battery. A battery cell usually includes a shell, a top cover, and an electrode assembly. The top cover sealing cover is arranged at the opening of the shell. The top cover and the shell together form a receiving cavity, and the electrode assembly is placed in the receiving cavity.

[0039] Furthermore, during the manufacture of battery cells, exhaust and injection processes are sequentially carried out, wherein exhaust refers to baking the battery cells in a high temperature and vacuum environment so that the moisture in the electrode assembly contained in the accommodating cavity can evaporate and be discharged to the outside of the battery cell through the injection hole on the top cover of the battery cell. After exhaust, the battery cell also needs to be injected, that is, electrolyte is injected into the accommodating cavity. However, the electrolyte cannot come into contact with moisture, and during the injection process, there may be insufficient injection after one injection, so multiple injections need to be achieved through sealing and breaking the seal so that the electrolyte can be better filled in the accommodating cavity. In other words, the injection hole needs to be sealed and broken multiple times.

[0040] Based on this, some switch valve structures are currently installed in the injection hole to seal or open the injection hole. However, the structure of the current switch valve is relatively complex, resulting in cumbersome operation. The complex structure also increases the failure rate of the switch valve, which is not conducive to improving operational efficiency.

[0041] Based on the above considerations, in order to solve the problem that the current switch valve has a relatively complex structure, which leads to cumbersome operation, and the complex structure also leads to an increased failure rate of the switch valve, which is not conducive to improving operational efficiency, one or more embodiments of the present application provide a valve assembly, in which at least part of the valve body is arranged in the injection hole of the battery cell, and the volume of the valve body changes when its own cavity is deformed, and it can switch between a closed state and an open state. When the valve body is in the closed state, it can seal the injection hole, so that a sealed environment is formed inside the battery cell; and when the valve body is in the open state, it can open the injection hole to facilitate the injection of electrolyte into the battery cell through the injection hole. As a result, the structure of the valve assembly is simpler, and the opening and sealing of the injection hole are achieved by the deformation of the inner cavity, which makes the operation easier and can effectively improve the operational efficiency.

[0042] It should be noted that the battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or hybrid via a busbar.

[0043] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells. For example, a battery cell assembly can be a battery module, which is a single module formed by arranging and securing multiple battery cells. For example, a battery module can be formed by bundling multiple battery cells using cable ties.

[0044] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are housed in the case.

[0045] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0046] As an example, the battery cell assembly may also be housed in the box by directly fixing the plurality of battery cells to the box.

[0047] Please also refer to Figure 1 、 Figure 2as well as Figure 3 An embodiment of the present application provides a valve assembly 10 for sealing or opening a liquid injection hole 101 of a battery cell 100. The valve assembly 10 includes a valve body 11 at least partially disposed in the liquid injection hole 101. The valve body 11 has a cavity (not shown in the figure) inside. The cavity is configured to be deformable to change the volume of the valve body 11 so that the valve body 11 can switch between a closed state for sealing the liquid injection hole 101 and an open state for opening the liquid injection hole 101.

[0048] It should be noted that the valve assembly 10 is a structure that can be used to seal or open the liquid injection hole 101 of the battery cell 100. The valve assembly 10 includes a valve body 11, at least a portion of which is disposed within the liquid injection hole 101, so that the valve body 11 can seal or open the liquid injection hole 101.

[0049] The interior of the valve body 11 is hollow, forming a cavity. The cavity can be filled with a deformable medium or discharged from the cavity to change its volume. Specifically, the deformable medium filled into the cavity can be a gas, a liquid, or another medium, all of which can achieve a change in the cavity's volume. These details are omitted here.

[0050] Furthermore, when gas is injected into the cavity, the cavity expands, increasing the overall volume of the valve body 11. At this point, the valve body 11 is in a closed state, and the portion of the valve body 11 located within the injection hole 101 blocks the injection hole 101, thereby sealing the injection hole 101. When gas is exhausted from the cavity, the cavity contracts, decreasing the overall volume of the valve body 11. At this point, the valve body 11 is in an open state, separating from the wall of the injection hole 101, thereby opening the injection hole 101.

[0051] Through the above structure, the valve assembly 10 can achieve repeated sealing and unsealing of the injection hole 101, so as to facilitate multiple injections into the battery cell 100 through the injection hole 101. In addition, the structure of the valve assembly 10 is simpler, and the opening and sealing of the injection hole 101 are achieved through the deformation of the inner cavity, which makes the operation easier and can effectively improve the operating efficiency.

[0052] In some embodiments, when the valve body 11 is closed, the volume of the valve body 11 increases, and at least a portion of the outer surface of the valve body 11 seals against the wall of the liquid injection hole 101. When the valve body 11 is open, the volume of the valve body 11 decreases, and a liquid-passing gap (not shown) is formed between the outer surface of the valve body 11 and the wall of the liquid injection hole 101.

[0053] Specifically, the injection hole 101 is typically formed as a cylindrical hole. Thus, the valve body 11 is configured as a cylindrical structure, so that the valve body 11 has an outer surface that can mate with the wall of the injection hole 101. When the valve body 11 is closed, the volume of the valve body 11 increases, so that at least a portion of the outer surface of the valve body 11 is in surface contact with the wall of the injection hole 101, and the interference fit between the two improves the sealing effect of the valve body 11 on the injection hole 101.

[0054] When the valve body 11 is in the open state, the volume of the valve body 11 becomes smaller. At this time, a liquid gap is formed between the outer surface of the valve body 11 and the hole wall of the injection hole 101. The liquid gap can enable liquid or gas to circulate in the injection hole 101, thereby realizing the injection or exhaust of the battery cell 100.

[0055] Through the above structure, the sealing effect of the valve body 11 on the liquid injection hole 101 can be further improved, and the liquid injection hole 101 can be opened smoothly in the open state.

[0056] In some embodiments, the valve body 11 includes a main body 12 and a sealing portion 13. The sealing portion 13 is connected to the main body 12 and is disposed around the outer circumference of the main body 12. The inner surface of the main body 12 and the inner surface of the sealing portion 13 are connected and together form the inner wall of the cavity. The outer surface of the sealing portion 13 is disposed to protrude from the outer surface of the main body 12. When the valve body 11 is in a closed state, the outer surface of the sealing portion 13 seals against the wall of the liquid injection hole 101. When the valve body 11 is in an open state, a liquid gap is formed between the outer surface of the sealing portion 13 and the wall of the liquid injection hole 101.

[0057] Specifically, the valve body 11 is configured as a cylindrical structure, with the sealing portion 13 protruding radially from the main body 12 and surrounding the main body 12. Specifically, the sealing portion 13 forms an annular sealing boss on the outer circumference of the main body 12. When the valve body 11 is closed, the annular sealing boss tightly fits against the wall of the injection hole 101, thereby sealing the injection hole 101. When the valve body 11 is open, the annular sealing boss separates from the wall of the injection hole 101, forming a liquid-free gap, thereby opening the injection hole 101.

[0058] Thus, by providing the main body 12 and the sealing portion 13 , the outer surface of the valve body 11 forms two regions with different heights, which can further improve the sealing stability during the sealing cooperation with the hole wall of the injection hole 101 .

[0059] In some embodiments, the thickness of the sealing portion 13 is smaller than the thickness of the body portion 12 .

[0060] Specifically, the sealing portion 13 and the main body 12 together enclose a cavity. The thickness of the sealing portion 13 refers to the thickness of the cavity wall at the position of the sealing portion 13 , and the thickness of the main body 12 refers to the thickness of the cavity wall at the position of the main body 12 .

[0061] When gas is injected into the cavity, the cavity expands, causing the cavity wall to elastically deform. The thickness of the sealing portion 13 is set to be smaller than that of the body 12, that is, the sealing portion 13 is thinner than the body 12. This allows the sealing portion 13 to elastically deform more when the cavity expands, allowing the valve body 11 to maintain a relatively good external shape while the sealing portion 13 can fully expand, thereby improving the sealing effect.

[0062] In some embodiments, the sealing portion 13 includes a plurality of sealing portions 13 , and the sealing portions 13 are spaced apart along the axial direction a of the liquid injection hole 101 .

[0063] Specifically, a plurality of sealing portions 13 may be provided, and the plurality of sealing portions 13 are spaced apart along the axial direction a of the liquid injection hole 101 , that is, along the penetrating direction of the liquid injection hole 101 .

[0064] By providing a plurality of sealing portions 13 , the sealing effect on the liquid injection hole 101 can be further improved, making the sealing more stable.

[0065] In some embodiments, an arc-shaped connecting section 14 is formed between the sealing portion 13 and the main body portion 12 .

[0066] Specifically, an arc-shaped transition is formed between the sealing portion 13 and the main body portion through the arc-shaped connecting section 14, which can reduce stress concentration at the edge of the sealing portion 13, so that the sealing portion 13 is subjected to force more evenly, thereby being able to deform better to seal the injection hole 101.

[0067] In some embodiments, the valve body 11 further includes an inserting portion 15, which is connected to the main body 12 or the sealing portion 13 at the end of the valve body 11. The inserting portion 15 is inserted into the injection hole 101, and the outer diameter of the inserting portion 15 gradually decreases along its insertion direction.

[0068] Specifically, the valve body 11 is inserted into the injection hole 101 along the axial direction a of the injection hole 101. The end of the valve body 11 that is closer to the interior of the battery cell 100 is the insertion portion 15, that is, the insertion portion 15 is located within the injection hole 101. In a direction perpendicular to the axial direction a of the injection hole 101, that is, along the radial direction of the injection hole 101, the outer diameter of the insertion portion 16 gradually decreases.

[0069] In this way, the outer surface of the insertion portion 15 is formed as a chamfered surface, so that the valve body 11 can be better inserted into the liquid injection hole 101.

[0070] In some embodiments, a first opening (not shown in the figure) connected to the cavity is further provided on the valve body 11, and the valve assembly 10 also includes an air nozzle 16 arranged at the first opening. The air nozzle 16 is used to fill the cavity with a deformation medium or extract the deformation medium from the cavity to switch the valve body 11 between a closed state and an open state.

[0071] Specifically, the air nozzle 16 is provided at the first opening and can be connected to an external inflation device or an exhaust device, so as to inflate gas into the cavity or exhaust gas from the cavity to achieve expansion or contraction of the cavity.

[0072] By providing the gas nozzle 16 , it is possible to smoothly fill the cavity with gas or extract gas from the cavity to change the volume of the cavity, so that the valve body 11 can smoothly switch between the closed state and the open state.

[0073] In some embodiments, the valve assembly 10 further includes a switch valve (not shown in the figures) disposed in the gas nozzle 16 , and the switch valve is used to open or close the gas nozzle 16 .

[0074] Specifically, an on-off valve is disposed within the gas nozzle 16, controlling its opening and closing. Opening the on-off valve opens the gas nozzle 16, allowing gas to be pumped into or out of the cavity. Once the inflation or degassing operation is complete, the on-off valve closes, closing the gas nozzle 16. This seals the cavity, maintaining its volume.

[0075] By setting the switch valve, the air nozzle 16 can be smoothly opened or closed, so as to perform the inflation or degassing operation on the cavity, and keep the volume of the cavity unchanged after the operation is completed, thereby achieving the smooth sealing or opening of the liquid injection hole 101.

[0076] Based on the same concept as the valve assembly 10 described above, the present application also provides a battery cell 100, comprising a housing, a top cover, an electrode assembly, and the valve assembly 10 described above. The housing has a second opening at one end, and the top cover is sealed to the second opening and encloses the housing to form a receiving cavity. The top cover has a liquid injection hole 101 extending therethrough. The electrode assembly is disposed within the receiving cavity, and the valve assembly 10 is disposed within the liquid injection hole 101 to seal or open the liquid injection hole 101.

[0077] Based on the same concept as the above-mentioned battery cell 100 , the present application also provides a battery device including the above-mentioned battery cell 100 .

[0078] Based on the same concept as the above-mentioned battery device, the present application also provides an electrical device, including the above-mentioned battery device.

[0079] According to one or more embodiments, when the present application is actually used, the first liquid injection is performed into the interior of the battery cell 100. After the first liquid injection is completed, the valve body 11 is set in the liquid injection hole 101, and the gas nozzle 16 is connected to the external inflation device. Gas is filled into the cavity through the gas nozzle 16, the cavity expands, and the volume of the valve body 11 increases, so that the valve body 11 is switched to the closed state.

[0080] At this point, the outer surface of the sealing portion 13 is in close contact with the wall of the liquid injection hole 101, and the two are in tight contact, thereby sealing the liquid injection hole 101. After inflation is completed, the switch valve is closed to close the air nozzle 16. At this time, a sealed environment is formed inside the cavity, and the volume of the cavity remains unchanged, which can stably seal the liquid injection hole 101.

[0081] Furthermore, when further injection or exhaust is required, the on-off valve is first opened and the gas in the cavity is exhausted through the air nozzle 16, causing the cavity to shrink and the volume of the valve body 11 to decrease. At this time, the valve body 11 switches to the open state, and a liquid gap is formed between the outer surface of the sealing portion 13 and the wall of the injection hole 101, smoothly opening the injection hole 101 to facilitate the injection or exhaust operation.

[0082] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned 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.

[0083] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A valve assembly, characterized in that: Used to seal or open the injection hole of a battery cell, the valve assembly includes a valve body at least partially arranged in the injection hole, the interior of the valve body has a cavity, and the cavity is configured to be deformable to change the volume of the valve body so that the valve body can switch between a closed state for sealing the injection hole and an open state for opening the injection hole.

2. The valve assembly according to claim 1, wherein: When the valve body is in the closed state, the volume of the valve body increases, and at least a portion of the outer surface of the valve body is in sealing engagement with the wall of the liquid injection hole; When the valve body is in the open state, the volume of the valve body becomes smaller, and a liquid gap is formed between the outer surface of the valve body and the hole wall of the liquid injection hole.

3. The valve assembly according to claim 2, wherein: The valve body includes a main body portion and a sealing portion, wherein the sealing portion is connected to the main body portion and is disposed around the outer circumference of the main body portion; The inner surface of the main body is connected to the inner surface of the sealing portion and together form the inner wall of the cavity, and the outer surface of the sealing portion is protruding from the outer surface of the main body; When the valve body is in the closed state, the outer surface of the sealing portion is sealed with the hole wall of the liquid injection hole; when the valve body is in the open state, the liquid gap is formed between the outer surface of the sealing portion and the hole wall of the liquid injection hole.

4. The valve assembly according to claim 3, wherein: The thickness of the sealing portion is smaller than the thickness of the main body portion.

5. The valve assembly according to claim 3, wherein: The sealing parts include a plurality of sealing parts, and the sealing parts are arranged at intervals along the axial direction of the liquid injection hole.

6. The valve assembly according to claim 3, wherein: An arc-shaped connecting section is formed between the sealing portion and the main body portion.

7. The valve assembly according to claim 3, wherein: The valve body further includes an inserting portion connected to the body portion or the sealing portion located at the end of the valve body; The insertion portion is inserted into the liquid injection hole, and the outer diameter of the insertion portion gradually decreases along its insertion direction.

8. The valve assembly according to claim 1, wherein: The valve body also has a first opening connected to the cavity, and the valve assembly also includes an air nozzle arranged at the first opening, and the air nozzle is used to fill the cavity with a deformation medium or extract the deformation medium from the cavity to switch the valve body between the closed state and the open state.

9. The valve assembly according to claim 8, wherein: The valve assembly further includes a switch valve disposed in the gas nozzle, and the switch valve is used to open or close the gas nozzle.

10. A battery cell, characterized in that: include: a housing having a second opening at one end; a top cover, sealed at the second opening and enclosed with the shell to form a receiving cavity, and a liquid injection hole is formed through the top cover; an electrode assembly, disposed in the accommodating cavity; and The valve assembly according to any one of claims 1 to 9 is arranged in the liquid injection hole to seal or open the liquid injection hole.

11. A battery device, characterized in that: The battery cell according to claim 10 is included.

12. An electrical device, characterized in that: Comprising the battery device as claimed in claim 11.

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