Liquid injection valve and liquid injection equipment

Abstract

The utility model provides a liquid injection valve and liquid injection equipment. The liquid injection valve is used for liquid injection of the single battery, the liquid injection valve comprises a valve body and a valve element, the valve body comprises a first channel and a second channel which are communicated, and the second channel is used for being communicated with a liquid injection hole of the single battery. The valve element is arranged on the valve body, and the valve element is configured to control communication of the first channel and the second channel. According to the invention, the influence of the external environment on the battery monomer in the production process can be effectively reduced, so that the production quality is improved and the production cost is reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a liquid injection valve and a liquid injection device. Background Art

[0002] With the development of new energy technology, batteries are used more and more widely, for example, in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools, etc.

[0003] During the production process of battery cells, the external environment has an important impact on the production quality of battery cells. It is usually necessary to strictly control the external environment to reduce the risk of battery cell scrapping. However, strict external environment control will also increase the overall production cost of battery cells. Therefore, how to effectively reduce the impact of the external environment on battery cells during the production process is an urgent problem to be solved in battery technology. Utility Model Content

[0004] In view of the above problems, the present application provides a liquid injection valve and a liquid injection device, which can effectively reduce the impact of the external environment on the battery cells during the production process, so as to improve the production quality and reduce the production cost.

[0005] In a first aspect, an embodiment of the present application provides a liquid injection valve, which is used for injecting liquid into a battery cell, and includes a valve body and a valve core, wherein the valve body includes a first channel and a second channel that are connected, and the second channel is used to communicate with the liquid injection hole of the battery cell. The valve core is disposed on the valve body, and the valve core is configured to control the communication between the first channel and the second channel.

[0006] The above technical solution can open the injection valve when the battery cell needs to be injected to provide injection conditions for the battery cell, and close the injection valve when the battery cell does not need to be injected to isolate the interaction between the external environment and the inside of the battery cell. It can not only effectively reduce the impact of the external environment on the battery cell during the production process, but also reduce the risk of electrolyte leakage inside the battery cell, which is conducive to improving production quality. At the same time, since the impact of the external environment on the battery cell during the production process is reduced, the control standards of the external environment can be lowered or the control of the external environment can be cancelled, which is conducive to reducing production costs.

[0007] In some embodiments of the first aspect, the first channel and the second channel are arranged along a first direction, and a projection of the first channel along the first direction is smaller than a projection of the second channel along the first direction.

[0008] The above technical solution can not only reduce the difficulty of setting the valve core and reduce the preparation cost of the injection valve, but also help to improve the injection effect of the battery cell.

[0009] In some embodiments of the first aspect, at least a portion of the valve core is disposed in the second passage.

[0010] The above technical solution can provide more flexibility for the configuration of the valve core, which can not only improve the design efficiency of the entire injection valve, but also provide convenient conditions for possible maintenance in the future.

[0011] In some embodiments of the first aspect, the valve core includes a blocking member and an elastic member, the elastic member connects the blocking member and the valve body, and the elastic member applies a force on the blocking member in a direction close to the first channel.

[0012] The above technical solution, by configuring the valve core to include a barrier member and an elastic member, not only has a simple structure, which is beneficial to reducing the preparation cost of the injection valve, but also can flexibly adjust and match the shape, size and material of the barrier member and the elastic member according to different application environments and requirements, thereby facilitating improving the design flexibility and applicability of the injection valve.

[0013] In some embodiments of the first aspect, the elastic member is disposed on a side of the blocking member facing away from the first channel.

[0014] The occupancy rate of the elastic member in the inner space of the valve body can be reduced, so that more space can be freed up inside the valve body for conveying electrolyte during the liquid injection process of the battery cell, thereby improving the liquid injection effect.

[0015] In some embodiments of the first aspect, a cross section of the first channel along its extension direction is circular, and the barrier comprises a sphere.

[0016] The above technical solution can improve the fit between the barrier and the channel opening at the junction of the first channel and the second channel through the coordinated design of the sphere and the circular channel opening, thereby improving the sealing effect. It can not only further reduce the impact of the external environment on the battery cell during the production process, but also further reduce the risk of electrolyte leakage inside the battery cell.

[0017] In some embodiments of the first aspect, the valve body includes a valve sleeve and a fixed seat, the valve sleeve is provided with a first channel and a second channel, the fixed seat is connected to the valve sleeve and located in the second channel, and the valve core is connected to the fixed seat.

[0018] The above technical solution provides an installation position for the valve core by setting a fixing seat, which can not only improve the stability of the valve core, but also improve the convenience of installation of the valve core.

[0019] In some embodiments of the first aspect, the fixing seat includes a main body and a connecting portion, the valve core is connected to the main body, the connecting portion is arranged around the outside of the main body, and the connecting portion connects the main body and the valve sleeve.

[0020] The design of the connecting portion surrounding the main body of the above technical solution increases the contact area between the fixing seat and the valve sleeve, which can effectively improve the stability of the fixing seat, thereby facilitating the improvement of the overall reliability of the liquid injection valve.

[0021] In some embodiments of the first aspect, a through hole is formed on the connecting portion, and the through hole penetrates the connecting portion along an extension direction of the second channel.

[0022] The above technical solution can provide additional flow channels by setting through holes on the connecting part, thereby increasing the flow rate of electrolyte during the battery cell injection process, thereby improving the injection efficiency; on the other hand, the through holes can also play a certain stress release role, thereby improving the structural strength of the connecting part.

[0023] In some embodiments of the first aspect, a groove is provided on the main body, the groove is recessed relative to a surface of the main body close to the first channel, and at least a portion of the valve core is accommodated in the groove.

[0024] The above technical solution can not only reduce the occupancy of the internal space of the valve body by the valve core by setting a groove on the main body, which is beneficial to improving the injection efficiency, but also play a certain guiding role in the movement of the valve core under certain application environments, so as to improve the reliability of the injection valve.

[0025] In some embodiments of the first aspect, the liquid injection valve further includes a limiter, the limiter protrudes from an outer surface of the valve body, and the limiter is used to abut against the battery cell.

[0026] The above technical solution sets a limiter which can limit the displacement of the injection valve in the direction close to the inside of the battery cell, thereby effectively reducing the risk of the injection valve falling into the battery cell during the injection process of the battery cell and improving the reliability of the injection valve.

[0027] In some embodiments of the first aspect, an anti-slip layer is disposed on the outer surface of the valve body.

[0028] The above technical solution arranges an anti-skid layer, which can increase the friction between the outer surface of the valve body and the inner wall surface of the injection hole, thereby improving the connection firmness between the injection valve and the battery cell, so as to reduce the risk of the injection valve falling into the battery cell during the injection process of the battery cell.

[0029] In a second aspect, the present application provides a liquid injection device, which includes the liquid injection valve provided by any embodiment of the first aspect.

[0030] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0032] Figure 1 A schematic diagram of an assembly structure of a liquid injection valve and a battery cell provided in some embodiments of the present application;

[0033] Figure 2 for Figure 1 Schematic diagram of the cross-section structure along AA;

[0034] Figure 3 for Figure 2 A partial enlarged structural schematic diagram of the injection valve shown;

[0035] Figure 4 A schematic diagram of an assembly structure of another liquid injection valve and a battery cell provided in some embodiments of the present application;

[0036] Figure 5 for Figure 4 Schematic diagram of the cross-section structure along BB;

[0037] Figure 6 for Figure 5 A partial enlarged structural schematic diagram of the injection valve is shown.

[0038] The reference numerals in the specific implementation manner are as follows:

[0039] 100, liquid injection valve; 200, battery cell; 210, liquid injection hole;

[0040] 10. Valve body; 11. First channel; 12. Second channel; 13. Valve sleeve; 14. Fixed seat; 141. Main body; 1411. Groove; 142. Connecting part; 1421. Through hole; 20. Valve core; 21. Barrier; 22. Elastic part; 30. Limiting part; 40. Anti-slip layer; X. First direction. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0042] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0043] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0044] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0045] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0046] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0047] The term "plurality" used in the present application refers to two or more (including two).

[0048] In the present application, the term "parallel" includes not only the absolutely parallel situation, but also the roughly parallel situation conventionally recognized in engineering; meanwhile, "vertical" includes not only the absolutely vertical situation, but also the roughly vertical situation conventionally recognized in engineering.

[0049] In the present application, the battery cell may include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell or a magnesium-ion battery cell, etc., and the embodiments of the present application do not limit this. The battery cell may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this.

[0050] With the development of new energy technology, batteries are used more and more widely, for example, in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools, etc.

[0051] During the production process of battery cells, the external environment has an important impact on the production quality of battery cells. Strict control of the external environment is usually required to reduce the risk of battery cell scrapping. However, strict external environment control will also increase the overall production cost of battery cells accordingly.

[0052] For example, during the production process of battery cells, it is often necessary to strictly control the humidity in the factory to reduce the risk of damage to the pole pieces, diaphragms or electrolytes inside the battery cells due to excessive humidity in the factory. For example, a battery cell is usually provided with an injection hole to facilitate the injection equipment to inject electrolyte into the battery cell. If the humidity in the factory is high, moisture will enter the battery cell through the injection hole, thereby affecting the pole pieces, diaphragms or electrolytes inside the battery cell. However, the cost of controlling the humidity in the factory is high, so it will correspondingly increase the overall production cost of the battery cell, seriously affecting the economic benefits.

[0053] Based on the above considerations, the present application designs a liquid injection valve, which is used for injecting liquid into a battery cell. The liquid injection valve includes a valve body and a valve core, the valve body includes a first channel and a second channel connected, and the second channel is used to communicate with the liquid injection hole of the battery cell. The valve core is arranged on the valve body, and the valve core is configured to control the communication between the first channel and the second channel.

[0054] When the battery cell needs to be injected, an external force is applied to the valve core to open the valve core and connect the first channel and the second channel, so that the injection device can inject electrolyte into the battery cell through the injection valve. After the battery cell injection is completed, the external force applied to the valve core is removed to return the valve core and isolate the first channel and the second channel, thereby cutting off the passage between the external environment and the inside of the battery cell.

[0055] In this way, the injection valve provided by the present application can open the valve to provide injection conditions for the battery cell when the battery cell needs to be injected, and close the valve to isolate the interaction between the external environment and the inside of the battery cell when the battery cell does not need to be injected. It can not only effectively reduce the impact of the external environment on the battery cell during the production process, but also reduce the risk of electrolyte leakage inside the battery cell, which is conducive to improving production quality. At the same time, since the impact of the external environment on the battery cell during the production process is reduced, the control standards of the external environment can be lowered or the control of the external environment can be cancelled, which is conducive to reducing production costs.

[0056] The following first introduces the liquid injection valve provided in the embodiment of the present application with reference to the accompanying drawings. Figure 1 A schematic diagram of an assembly structure of a liquid injection valve and a battery cell provided in some embodiments of the present application, Figure 2 for Figure 1 Schematic diagram of the cross-section structure along AA, Figure 3 for Figure 2 A partial enlarged structural schematic diagram of the injection valve is shown.

[0057] like Figures 1 to 3 As shown, the embodiment of the present application provides a liquid injection valve 100, which is used for injecting liquid into a battery cell 200. The liquid injection valve 100 includes a valve body 10 and a valve core 20. The valve body 10 includes a first channel 11 and a second channel 12 that are connected. The second channel 12 is used to communicate with a liquid injection hole 210 of the battery cell 200. The valve core 20 is disposed on the valve body 10, and the valve core 20 is configured to control the communication between the first channel 11 and the second channel 12.

[0058] For example, the injection hole 210 may be provided on the outer shell of the battery cell 200, the valve body 10 is used to be mounted on the battery cell 200 and cover the injection hole 210 of the battery cell 200, the valve body 10 may be connected to the outer shell of the battery cell 200 and cover the injection hole 210, and the injection hole 210 can connect the outside and the inside of the battery cell 200, so that the injection equipment can inject electrolyte into the inside of the battery cell 200. The valve core 20 can be opened when subjected to external force to connect the first channel 11 and the second channel 12, and can isolate the first channel 11 and the second channel 12 when not subjected to external force.

[0059] When the battery cell 200 is undergoing the injection process, the first channel 11 mainly serves as an inlet path for the electrolyte to be transported from the injection equipment to the inside of the battery, while the second channel 12 is used to guide the electrolyte to pass through the injection hole 210 of the battery cell 200 and enter the inside of the battery cell 200.

[0060] Optionally, the valve core 20 may be detachably connected to the valve body 10, or may be integrally provided on the valve body 10; the valve core 20 may be directly connected to the valve body 10, or may be restricted on the valve body 10 by other components. The valve body 10 and the valve core 20 may be made of, but not limited to, metal or non-metal materials, for example, the metal material may be steel, iron, copper, copper alloy, aluminum or aluminum alloy, etc.; the non-metal material may be polyethylene, polypropylene or polyvinyl chloride, etc.

[0061] The valve core 20 is designed to be able to dynamically respond to external forces to achieve control functions. Under normal conditions, the valve core 20 is not affected by external forces, and the valve core 20 remains in a closed state, so that the first channel 11 and the second channel 12 are in an isolated state, thereby cutting off the interaction between the external environment and the interior of the battery cell 200. When the battery cell 200 needs to be injected, an external force is applied to the valve core 20 to open the valve core 20, so that the first channel 11 and the second channel 12 are connected, so that the injection device can inject electrolyte into the interior of the battery cell 200 through the injection valve 100. After the battery cell 200 is injected, the external force acting on the valve core 20 is removed, and the valve core 20 automatically returns to its closed state by relying on a preset recovery mechanism, and the first channel 11 and the second channel 12 are again isolated, thereby cutting off the interaction between the external environment and the interior of the battery cell 200.

[0062] For example, the external force may be applied to the valve core 20 by, but not limited to, manual operation, mechanical device pushing or command of an automated control system. The external force may be, but not limited to, pressure, tension, electromagnetic force or mechanical force.

[0063] As an example, the valve core 20 is movably arranged relative to the valve body 10, so that the valve core 20 has an initial position and a liquid injection position. When the valve core 20 is not acted upon by an external force, the valve core 20 is located at the initial position, and can block the first channel 11 and the second channel 12, so that the first channel 11 and the second channel 12 are not connected; when an external force acts on the valve core 20, the valve core 20 is located at the liquid injection position, and the blocking of the first channel 11 and the second channel 12 is cancelled, so that the first channel 11 and the second channel 12 are connected.

[0064] As another example, the valve core 20 includes a valve port and a sealing member, the first channel 11 and the second channel 12 can be connected through the valve port, and the sealing member is movably arranged to open or close the valve port. When the valve core 20 is not subjected to external force, the valve port is closed, and the passage between the first channel 11 and the second channel 12 can be cut off; when an external force acts on the valve core 20, the valve port is opened, so that the first channel 11 and the second channel 12 can be connected through the valve port.

[0065] In this way, the above technical solution can open the injection valve 100 when the battery cell 200 needs to be injected to provide injection conditions for the battery cell 200, and close the injection valve 100 when the battery cell 200 does not need to be injected to isolate the interaction between the external environment and the inside of the battery cell 200, which can not only effectively reduce the impact of the external environment on the battery cell 200 during the production process, but also reduce the risk of electrolyte leakage inside the battery cell 200, thereby helping to improve production quality. At the same time, since the impact of the external environment on the battery cell 200 during the production process is reduced, the control standards of the external environment can be lowered or the control of the external environment can be cancelled, thereby helping to reduce production costs.

[0066] In some embodiments, the first channel 11 and the second channel 12 are arranged along the first direction X, and the projection of the first channel 11 along the first direction X is located within the projection of the second channel 12 along the first direction X.

[0067] Exemplarily, the valve body 10 may be extended along the first direction X, the first channel 11 and the second channel 12 may both be extended along the first direction X, and the first channel 11 and the second channel 12 are arranged along the first direction X.

[0068] In the injection process of the battery cell 200, the first channel 11 serves as an inlet for the electrolyte to be transported from the external injection device to the inside of the battery cell 200, and its smaller projection along the first direction X means a narrower path. This design, on the one hand, can facilitate the valve core 20 to block the first channel 11, so as to isolate the first channel 11 from the second channel 12, which is conducive to reducing the difficulty of setting the valve core 20; on the other hand, it can also control the initial inflow speed of the electrolyte to a certain extent, so as to improve the stability of the electrolyte in the process of being transported to the second channel 12.

[0069] The second channel 12 is used to guide the electrolyte to pass through the injection hole 210 of the battery cell 200 and enter the interior of the battery cell 200. Its larger projection along the first direction X provides a wider path for the flow of the electrolyte, which can reduce the flow resistance of the electrolyte so that the liquid can enter the interior of the battery cell 200 more smoothly.

[0070] In this way, the above technical solution can not only reduce the difficulty of setting the valve core 20 and reduce the preparation cost of the injection valve 100 , but also help to improve the injection effect of the battery cell 200 .

[0071] In some embodiments, at least a portion of the valve core 20 is disposed in the second passage 12 .

[0072] For example, a part of the valve core 20 may be arranged in the second channel 12, and another part of the valve core 20 may be arranged in the first channel 11; or the entire valve core 20 may be arranged in the second channel 12. As described above, the second channel 12 has a larger projection along the first direction X, which means that there is a more spacious space, which can make the design and adjustment of the size and position of the valve core 20 have more freedom, thereby effectively reducing the technical difficulties and implementation complexity that may be encountered in the arrangement of the valve core 20.

[0073] The above technical solution can provide more flexibility for the configuration of the valve core 20, which can not only improve the design efficiency of the entire injection valve 100, but also provide convenient conditions for possible maintenance in the future.

[0074] In some embodiments, the valve core 20 includes a blocking member 21 and an elastic member 22 . The elastic member 22 connects the blocking member 21 and the valve body 10 . The elastic member 22 applies a force to the blocking member 21 in a direction close to the first channel 11 .

[0075] For example, the main function of the barrier 21 is to directly isolate the first channel 11 from the second channel 12, and the elastic member 22 plays the role of providing a preset force. The elastic member 22 applies a force to the barrier 21 in a direction close to the first channel 11 through its inherent elastic force, so that the valve core 20 can abut against the connection between the first channel 11 and the second channel 12 without being affected by external forces, so as to isolate the first channel 11 from the second channel 12. When the external force applied to the barrier 21 exceeds the elastic force applied by the elastic member 22 to the barrier 21, the barrier 21 moves in a direction away from the first channel 11, so that the first channel 11 and the second channel 12 are connected.

[0076] The barrier member 21 may be detachably connected to the elastic member 22, or may be integrally provided on the elastic member 22. The barrier member 21 may be directly connected to the elastic member 22, or may be restricted to the elastic member 22 by other components. As an example, the barrier member 21 and the elastic member 22 may be connected by, but not limited to, bolt connection, welding, riveting, or clamping.

[0077] Optionally, the barrier 21 may be, but not limited to, a plate-shaped structure, a block-shaped structure, or a spherical structure, etc., and the specific shape and size of the barrier 21 may be set according to the specific structure inside the valve body 10. The barrier 21 may be, but not limited to, made of metal or non-metal materials, for example, the metal material may be steel, iron, copper, copper alloy, aluminum or aluminum alloy, etc.; the non-metal material may be polyethylene, polypropylene or polyvinyl chloride, etc. Further, the barrier 21 may be made of wear-resistant materials, such as hard alloy or metal coated with a special coating, to increase its service life.

[0078] Optionally, the elastic member 22 may be, but is not limited to, a spring, a rubber strip, or a memory alloy member.

[0079] In addition, the applicability of the injection valve 100 can be improved by selecting elastic members 22 with different elastic coefficients or adjusting the preload force of the elastic member 22 to set different switching sensitivities of the valve core 20 .

[0080] The above technical solution, by configuring the valve core 20 to include a barrier member 21 and an elastic member 22, not only has a simple structure, which is beneficial to reducing the preparation cost of the injection valve 100, but also can flexibly adjust and match the shape, size and material of the barrier member 21 and the elastic member 22 according to different application environments and requirements, thereby facilitating improving the design flexibility and applicability of the injection valve 100.

[0081] In some embodiments, the elastic member 22 is disposed on a side of the blocking member 21 facing away from the first channel 11 .

[0082] Exemplarily, the elastic member 22 applies a force on the barrier member 21 in a direction close to the first channel 11 through its own elastic deformation. When the elastic member 22 is arranged on the side of the barrier member 21 facing away from the first channel 11, the elastic member 22 will always be in a compressed state to provide thrust for the barrier member 21.

[0083] In this way, the elastic member 22 is in a compressed state so that the volume of the elastic member 22 is relatively small, thereby reducing the occupancy rate of the elastic member 22 on the internal space of the valve body 10, thereby freeing up more space inside the valve body 10 for transporting electrolyte during the injection process of the battery cell 200 to improve the injection effect.

[0084] In some embodiments, the cross section of the first channel 11 along its extension direction is circular, and the barrier 21 includes a sphere.

[0085] Exemplarily, the first channel 11 may extend along the first direction X, the channel opening where the first channel 11 connects with the second channel 12 is circular, and the blocking member 21 blocks the channel opening where the first channel 11 connects with the second channel 12.

[0086] Optionally, the projection of the first channel 11 in the first direction X is located within the projection of the blocking member 21 in the first direction X, so as to improve the blocking effect of the blocking member 21 on the first channel 11 .

[0087] The above technical solution can improve the fit between the barrier 21 and the channel opening at the junction of the first channel 11 and the second channel 12 through the coordinated design of the sphere and the circular channel opening, thereby improving the sealing effect. It can not only further reduce the impact of the external environment on the battery cell 200 during the production process, but also further reduce the risk of electrolyte leakage inside the battery cell 200.

[0088] In some embodiments, the valve body 10 includes a valve sleeve 13 and a fixing seat 14 . The valve sleeve 13 defines a first channel 11 and a second channel 12 . The fixing seat 14 is connected to the valve sleeve 13 and is located in the second channel 12 . The valve core 20 is connected to the fixing seat 14 .

[0089] Exemplarily, the main function of the valve sleeve 13 is to provide a medium flow path, in other words, the valve sleeve 13 is used to provide a flow path for the electrolyte during the injection process of the battery cell 200. The main function of the fixing seat 14 is to provide an installation position for the valve core 20 to improve the stability and installation convenience of the valve core 20.

[0090] The fixing seat 14 can be detachably connected to the valve sleeve 13, or can be integrally provided on the valve sleeve 13. The fixing seat 14 can be directly connected to the valve sleeve 13, or can be restricted on the valve sleeve 13 by other components. As an example, the connection method between the fixing seat 14 and the valve sleeve 13 can be, but is not limited to, bolt connection, welding, riveting or clamping, etc.

[0091] Optionally, the valve sleeve 13 and the fixing seat 14 are integrally formed. On the one hand, there is no need to connect the valve sleeve 13 and the fixing seat 14 through an additional connection process, which simplifies the manufacturing process. On the other hand, compared with connecting the valve sleeve 13 and the fixing seat 14 through an additional connection process, the valve sleeve 13 and the fixing seat 14 in an integral structure have a higher connection firmness.

[0092] The valve core 20 can be detachably connected to the fixing seat 14, or can be integrally arranged on the fixing seat 14. The valve core 20 can be directly connected to the fixing seat 14, or can be restricted on the fixing seat 14 by other components. As an example, the connection method between the valve core 20 and the fixing seat 14 can be, but is not limited to, bolt connection, welding, riveting or clamping, etc.

[0093] The above technical solution provides a mounting position for the valve core 20 by setting a fixing seat 14 , which can not only improve the stability of the valve core 20 , but also improve the convenience of installing the valve core 20 .

[0094] In some embodiments, the fixing seat 14 includes a main body 141 and a connecting portion 142 . The valve core 20 is connected to the main body 141 . The connecting portion 142 is disposed around the outside of the main body 141 . The connecting portion 142 connects the main body 141 and the valve sleeve 13 .

[0095] Exemplarily, the main function of the main body 141 is to provide a connection point for the valve core 20, and the connection part 142 is mainly used to achieve a fixed connection between the fixed seat 14 and the valve sleeve 13. The connection part 142 is arranged around the outside of the main body 141, which means that the connection part 142 is connected to the outside of the main body 141 and extends along the circumference of the main body 141. The outside of the main body 141 refers to the side of the main body 141 facing the valve sleeve 13. It should be noted that when the connection part 142 is arranged around the main body 141, a hole can be opened on the connection part 142 to provide a flow channel for the electrolyte, or a flow channel can be opened on the valve sleeve 13 and avoid the position where the connection part 142 is located to allow the electrolyte to flow.

[0096] The connecting portion 142 may be detachably connected to the main body 141, or may be integrally provided on the main body 141. The connecting portion 142 may be directly connected to the main body 141, or may be restricted to the main body 141 by other components. As an example, the connection method between the connecting portion 142 and the main body 141 may be, but is not limited to, bolt connection, welding, riveting, or clamping.

[0097] Optionally, the main body 141 and the connecting portion 142 are integrally formed. On the one hand, there is no need to connect the main body 141 and the connecting portion 142 through an additional connection process, which simplifies the manufacturing process. On the other hand, compared with connecting the main body 141 and the connecting portion 142 through an additional connection process, the main body 141 and the connecting portion 142 in an integral structure have a higher connection firmness.

[0098] The design of the connecting portion 142 surrounding the main body 141 in the above technical solution increases the contact area between the fixing seat 14 and the valve sleeve 13, which can effectively improve the stability of the fixing seat 14, thereby facilitating the improvement of the overall reliability of the injection valve 100.

[0099] In some embodiments, a through hole 1421 is defined in the connecting portion 142 , and the through hole 1421 penetrates the connecting portion 142 along the extending direction of the second channel 12 .

[0100] Exemplarily, the through hole 1421 can provide an additional medium flow channel. In other words, during the injection process of the battery cell 200 , the through hole 1421 is used to provide an additional flow channel for the electrolyte.

[0101] Optionally, the through hole 1421 may be processed by a precision processing technique, such as CNC machine tool processing, to ensure the surface smoothness of the through hole 1421 and reduce the risk of causing unnecessary resistance to the fluid flow.

[0102] Optionally, the number of the through holes 1421 may be one or more, which may be selected according to the actual application environment. As an example, when the number of the through holes 1421 is multiple, the multiple through holes 1421 are arranged at intervals along the extension direction of the connecting portion 142 .

[0103] Optionally, the projection shape of the through hole 1421 along the first direction X may be, but is not limited to, a circle, a rectangle, an ellipse, a trapezoid or a triangle, etc., which may be selected according to the actual application environment.

[0104] The above technical solution, by setting a through hole 1421 on the connecting portion 142, can, on the one hand, provide an additional flow channel to increase the flow rate of the electrolyte during the injection process of the battery cell 200, thereby improving the injection efficiency; on the other hand, the through hole 1421 can also play a certain stress release role, thereby improving the structural strength of the connecting portion 142.

[0105] In some embodiments, a groove 1411 is provided on the main body 141 . The groove 1411 is recessed relative to a surface of the main body 141 close to the first channel 11 . At least a portion of the valve core 20 is accommodated in the groove 1411 .

[0106] Exemplarily, the groove 1411 can accommodate a portion of the valve core 20, which is beneficial to reduce the occupation of the valve core 20 in the internal space of the valve body 10, thereby freeing up more space inside the valve body 10 for transporting electrolyte during the injection process of the battery cell 200. In addition, in the design mode in which the valve core 20 is configured to realize the opening and closing of the injection valve 100 through the relative movement between itself and the valve body 10, when the valve core 20 moves relative to the valve body 10, the groove 1411 can play a certain guiding role in the movement of the valve core 20, so that the valve core 20 can move smoothly along the predetermined path, thereby reducing the risk of the valve core 20 being misplaced during the movement.

[0107] Optionally, a portion of the valve core 20 may be accommodated in the groove 1411, and another portion of the valve core 20 may be located outside the groove 1411; or the entire valve core 20 may be accommodated in the groove 1411. The shape and size of the groove 1411 may match the shape and size of the valve core 20 to improve the compatibility of the groove 1411 and the valve core 20.

[0108] The above technical solution, by setting a groove 1411 on the main body 141, can not only reduce the occupancy of the internal space of the valve body 10 by the valve core 20, which is beneficial to improving the injection efficiency, but also can play a certain guiding role in the movement of the valve core 20 under certain application environments, so as to improve the reliability of the injection valve 100.

[0109] Figure 4 This is a schematic diagram of the assembly structure of another liquid injection valve and a battery cell provided in some embodiments of the present application. Figure 5 for Figure 4 Schematic diagram of the cross-section structure along BB, Figure 6 for Figure 5 A partial enlarged structural schematic diagram of the injection valve is shown.

[0110] Continue to refer Figures 4 to 6 In some embodiments, the injection valve 100 further includes a stopper 30 , which protrudes from the outer surface of the valve body 10 , and is used to abut against the battery cell 200 .

[0111] Exemplarily, the valve body 10 may be inserted into the injection hole 210 , the limiter 30 is located outside the battery cell 200 and abuts against the battery cell 200 , and the limiter 30 can limit the displacement of the injection valve 100 in the direction close to the inside of the battery cell 200 .

[0112] The stopper 30 can be detachably connected to the valve body 10, or can be integrally provided on the valve body 10. The stopper 30 can be directly connected to the valve body 10, or can be limited to the valve body 10 by other components. As an example, the connection method between the stopper 30 and the valve body 10 can be, but is not limited to, bolt connection, welding, riveting or clamping, etc.

[0113] Optionally, the stopper 30 and the valve body 10 are integrally formed. On the one hand, there is no need to connect the stopper 30 and the valve body 10 through an additional connection process, which simplifies the manufacturing process. On the other hand, compared with connecting the stopper 30 and the valve body 10 through an additional connection process, the stopper 30 and the valve body 10 in an integral structure have a higher connection firmness.

[0114] Optionally, the stopper 30 may be, but is not limited to, a plate-shaped structure, a block-shaped structure, or a spherical structure, etc. The specific shape and size of the stopper 30 may be set according to the specific structure inside the valve body 10 .

[0115] The stopper 30 may be made of, but is not limited to, metal or non-metal material, for example, the metal material may be steel, iron, copper, copper alloy, aluminum or aluminum alloy, etc.; the non-metal material may be polyethylene, polypropylene or polyvinyl chloride, etc. Further, the stopper 30 may be made of a wear-resistant material, such as hard alloy or metal coated with a special coating, to increase its service life.

[0116] It can be understood that, for example, when the valve body 10 is inserted into the injection hole 210, when the battery cell 200 needs to be injected, in the process of applying external force to the valve core 20 to open the valve core 20, the injection valve 100 also has a tendency to move in a direction close to the interior of the battery cell 200 under the action of the external force.

[0117] In this way, the above technical solution sets a limit member 30, and the limit member 30 can limit the displacement of the injection valve 100 in the direction close to the inside of the battery cell 200, thereby effectively reducing the risk of the injection valve 100 falling into the inside of the battery cell 200 during the injection process of the battery cell 200, thereby improving the reliability of the injection valve 100.

[0118] In some embodiments, an anti-slip layer 40 is disposed on the outer surface of the valve body 10 .

[0119] Exemplarily, the valve body 10 may be inserted into the injection hole 210 , and the anti-slip layer 40 may increase the friction coefficient of the outer surface of the valve body 10 to increase the friction between the outer surface of the valve body 10 and the inner wall of the injection hole 210 .

[0120] As an example, the anti-slip layer 40 can be a concave-convex structure arranged on the outer surface of the valve body 10, which can increase the friction coefficient of the outer surface of the valve body 10, thereby increasing the friction between the outer surface of the valve body 10 and the inner wall surface of the injection hole 210.

[0121] As another example, the anti-skid layer 40 may also be an anti-skid pad or an anti-skid coating disposed on the outer surface of the valve body 10 , thereby increasing the friction between the outer surface of the valve body 10 and the inner wall surface of the injection hole 210 .

[0122] Optionally, the anti-slip layer 40 may be made of, but is not limited to, rubber, polyvinyl chloride, or polyurethane.

[0123] It can be understood that, for example, when the valve body 10 is inserted into the injection hole 210, when the battery cell 200 needs to be injected, in the process of applying external force to the valve core 20 to open the valve core 20, the injection valve 100 also has a tendency to move in a direction close to the interior of the battery cell 200 under the action of the external force.

[0124] The above technical solution arranges an anti-skid layer 40, which can increase the friction between the outer surface of the valve body 10 and the inner wall surface of the injection hole 210, thereby improving the connection firmness between the injection valve 100 and the battery cell 200, so as to reduce the risk of the injection valve 100 falling into the battery cell 200 during the injection process of the battery cell 200.

[0125] According to some embodiments of the present application, the present application also provides a liquid injection device, including the liquid injection valve 100 of any of the above schemes.

[0126] In order to better understand the liquid injection valve 100 provided in the embodiment of the present application, based on the same inventive concept, an embodiment of the above-mentioned liquid injection valve 100 in actual application is provided herein for illustration.

[0127] An embodiment of the present application provides a liquid injection valve 100, which is used for injecting liquid into a battery cell 200. The liquid injection valve 100 includes a valve body 10 and a valve core 20. The valve body 10 includes a first channel 11 and a second channel 12 that are arranged and connected along a first direction X. The projection of the first channel 11 along the first direction X is located within the projection of the second channel 12 along the first direction X. At least a portion of the valve core 20 is arranged in the second channel 12. The second channel 12 is used to communicate with the liquid injection hole 210 of the battery cell 200.

[0128] The valve core 20 is disposed on the valve body 10, and the valve core 20 is configured to control the communication between the first channel 11 and the second channel 12. The valve core 20 includes a barrier 21 and an elastic member 22, the elastic member 22 connects the barrier 21 and the valve body 10, and the elastic member 22 applies a force to the barrier 21 in a direction close to the first channel 11. The elastic member 22 is disposed on a side of the barrier 21 that is away from the first channel 11. The cross section of the first channel 11 along its own extension direction is circular, and the barrier 21 includes a sphere.

[0129] The above technical solution can open the injection valve 100 when the battery cell 200 needs to be injected to provide injection conditions for the battery cell 200, and close the injection valve 100 when the battery cell 200 does not need to be injected to isolate the interaction between the external environment and the inside of the battery cell 200. It can not only effectively reduce the impact of the external environment on the battery cell 200 during the production process, but also reduce the risk of electrolyte leakage inside the battery cell 200, which is conducive to improving production quality. At the same time, since the impact of the external environment on the battery cell 200 during the production process is reduced, the control standards of the external environment can be lowered or the control of the external environment can be cancelled, which is conducive to reducing production costs.

[0130] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0131] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A liquid injection valve for injecting liquid into a battery cell, characterized in that: include: The valve body comprises a first channel and a second channel which are connected, wherein the second channel is used to communicate with the injection hole of the battery cell; A valve core is disposed on the valve body, and the valve core is configured to control the communication between the first channel and the second channel.

2. The liquid injection valve according to claim 1, characterized in that: The first channel and the second channel are arranged along a first direction, and a projection of the first channel along the first direction is smaller than a projection of the second channel along the first direction.

3. The liquid injection valve according to claim 2, characterized in that: At least a portion of the valve core is disposed in the second passage.

4. The liquid injection valve according to claim 1, characterized in that: The valve core includes a blocking member and an elastic member, wherein the elastic member connects the blocking member and the valve body, and the elastic member applies a force to the blocking member in a direction close to the first channel.

5. The liquid injection valve according to claim 4, characterized in that: The elastic member is arranged on a side of the blocking member facing away from the first channel.

6. The liquid injection valve according to claim 4, characterized in that: The cross section of the first channel along its extension direction is circular, and the blocking member includes a sphere.

7. The liquid injection valve according to claim 1, characterized in that: The valve body comprises a valve sleeve and a fixed seat, the valve sleeve is provided with the first channel and the second channel, the fixed seat is connected to the valve sleeve and is located in the second channel, and the valve core is connected to the fixed seat.

8. The liquid injection valve according to claim 7, characterized in that: The fixing seat comprises a main body and a connecting part, the valve core is connected to the main body, the connecting part is arranged around the outside of the main body, and the connecting part connects the main body and the valve sleeve.

9. The liquid injection valve according to claim 8, characterized in that: The connecting portion is provided with a through hole, and the through hole penetrates the connecting portion along an extending direction of the second channel.

10. The liquid injection valve according to claim 8, characterized in that: The main body is provided with a groove, the groove is sunken relative to a surface of the main body close to the first channel, and at least a part of the valve core is accommodated in the groove.

11. The liquid injection valve according to any one of claims 1 to 10, characterized in that: The injection valve further includes a limiter, which protrudes from the outer surface of the valve body and is used to abut against the battery cell.

12. The liquid injection valve according to any one of claims 1 to 10, characterized in that: An anti-slip layer is arranged on the outer surface of the valve body.

13. A liquid injection device, characterized in that: It comprises a liquid injection valve as described in any one of claims 1-12.

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