Liquid injection mechanism, liquid injection machine and single battery

Abstract

The embodiment of the invention provides a liquid injection mechanism, a liquid injection machine and a single battery, and the liquid injection mechanism comprises a liquid injection pipe used for injecting electrolyte; and the sealing assembly comprises a sealing piece, the sealing piece is annularly arranged and arranged on the periphery of the liquid injection pipe in a sealing and sleeving mode, the sealing piece has the radial direction, and the sealing piece can deform in the radial direction in the direction away from the liquid injection pipe. An annular sealing piece of the liquid injection mechanism is arranged on the periphery of a liquid injection pipe in a sleeving manner, and the sealing piece can be deformed in the radial direction, so that the sealing piece can be attached to battery cell liquid injection holes with different sizes, and the problems that the contact area of a traditional fixed sealing piece and the battery cell liquid injection holes is insufficient and electrolyte overflows are solved; the sealing reliability is improved, and the risk of electrolyte overflow is reduced. And the overall size of the liquid injection mechanism can be reduced due to the deformable characteristic of the sealing element. In addition, the sealing element can adapt to various battery cell specifications through deformation, and the universality and production compatibility of the liquid injection mechanism are enhanced.

Description

Technical Field

[0001] The invention belongs to the technical field of batteries, and in particular relates to a liquid injection mechanism, a liquid injection machine and a single battery. Background Art

[0002] In recent years, with the continuous development of new energy technologies, power batteries, as the main power source of new energy vehicles, have become one of the key components of electric vehicles.

[0003] During the production of power batteries, electrolyte needs to be injected into the battery through an injection mechanism. To prevent the electrolyte from overflowing during the injection process and polluting the environment, a sealing gasket is usually installed on the injection mechanism to prevent the electrolyte from overflowing and causing pollution. However, when the battery cell is small, the area available for sealing will be reduced, resulting in a weakened sealing isolation effect and making it easy for the electrolyte to overflow. At the same time, in order to ensure that the sealing gasket has sufficient sealing area, the volume of the injection mechanism is also quite large, resulting in the entire injection machine occupying a large amount of factory space. Summary of the Invention

[0004] The embodiments of the present invention provide a liquid injection mechanism, a liquid injection machine and a single battery to solve the problem that the sealing isolation effect is weakened due to the reduction of the sealing area of ​​the liquid injection mechanism.

[0005] In order to solve the above-mentioned technical problems, the present invention is achieved as follows:

[0006] In a first aspect, the present invention provides a liquid injection mechanism, comprising:

[0007] A liquid injection tube, used for injecting electrolyte;

[0008] The sealing assembly includes a sealing member, which is arranged in an annular shape and is sealingly sleeved on the outer circumference of the injection tube. The sealing member has a radial direction and can be deformed in the direction away from the injection tube in the radial direction.

[0009] Optionally, an annular cavity is formed between the inner wall of the sealing member and the outer wall of the liquid injection tube, the sealing member is elastic, and the annular cavity can inject a medium and cause the sealing member to deform along the radial direction.

[0010] Optionally, the sealing assembly further includes a delivery tube, which is sleeved on the outer circumference of the injection tube. The delivery tube has a delivery cavity for delivering the medium, and the delivery cavity is communicated with the annular cavity.

[0011] Optionally, the delivery tube has a main delivery section and a connecting section both of which are sleeved on the outer circumference of the injection tube, the delivery cavity includes a connected main delivery cavity and a connecting cavity, the inner wall of the main delivery section is spaced apart from the outer wall of the injection tube to form the main delivery cavity, the inner wall of the connecting section is spaced apart from the outer wall of the injection tube to form the connecting cavity, the connecting cavity is connected to the annular cavity, and the sealing member is connected to the connecting section; the injection mechanism has a first direction, the delivery tube and the injection tube both extend along the first direction, and on a plane perpendicular to the first direction, the cross-sectional area of ​​the connecting cavity is smaller than the cross-sectional area of ​​the main delivery cavity.

[0012] Optionally, along the first direction, the sealing member is located on a side of the connecting section away from the main delivery section; the connecting section has a first end away from the main delivery section, the liquid injection tube has a liquid outlet end, and the first end is staggered relative to the liquid outlet end in the first direction toward a side closer to the main delivery section;

[0013] The sealing member includes a deformation portion, a first fixing portion and a second fixing portion, the deformation portion is connected between the first fixing portion and the second fixing portion in the first direction, the annular cavity is formed between the deformation portion and the injection tube, the first fixing portion is sealedly connected to the connecting section, and the second fixing portion is sealedly connected to the injection tube.

[0014] Optionally, the inner wall of the seal is sealedly connected to the outer wall of the injection tube, the seal has an annular cavity and a communicating port, the annular cavity surrounds the outer circumference of the injection tube, and the communicating port is communicated with the annular cavity; the seal is elastic, and the communicating port allows the medium to be injected into the annular cavity and enables the seal to deform along the radial direction.

[0015] In a second aspect, the present invention further provides a liquid injection machine comprising the liquid injection mechanism described in any one of the above embodiments.

[0016] In a third aspect, the present invention further provides a single cell battery, comprising:

[0017] A housing, wherein the housing is provided with a receiving cavity;

[0018] an electrode assembly, the electrode assembly being disposed in the accommodating cavity;

[0019] A top cover piece is connected to the shell and covers the accommodating cavity. The top cover piece is provided with an injection hole, which passes through the top cover piece. The injection hole can allow the injection tube of the above embodiment to extend into the injection hole, and the sealing member can be deformed and sealed with the hole wall of the injection hole.

[0020] Optionally, a groove portion is provided on the hole wall of the liquid injection hole, and the groove portion can accommodate at least a portion of the sealing member.

[0021] Optionally, the groove portion is arranged in an annular shape and surrounds at least a portion of the circumference of the hole wall; or, there are multiple groove portions, and the multiple groove portions are arranged at intervals along the circumference of the hole wall.

[0022] In the embodiment of the present application, the annular seal is sleeved on the outer circumference of the injection tube, and the seal can be deformed radially. When the injection mechanism injects liquid into the single cell, the injection tube extends into the injection hole. At this time, the seal contacts the hole wall of the injection hole. Since the seal can deform in the radial direction, it can better fit with the hole wall of the injection hole and perform a more reliable seal, preventing electrolyte overflow and compensating for the problem of electrolyte overflow caused by insufficient contact area between the traditional seal and the injection hole. Since the seal is deformable and contacts the hole wall of the injection hole instead of covering the injection hole, the volume occupied is reduced compared to the traditional cover-type seal, which can improve the problem of large size of the injection mechanism and reduce the space occupied by the factory. In addition, the deformable seal can adapt to the diverse specifications of the battery cell through deformation, enhancing the versatility and production compatibility of the injection mechanism.

[0023] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0025] Figure 1 This is a schematic diagram of a liquid injection mechanism in use provided in an embodiment of the present application;

[0026] Figure 2 yes Figure 1 Cross-sectional view when the AA position is not filled with medium;

[0027] Figure 3 yes Figure 2 The enlarged view of point Ⅰ in the middle;

[0028] Figure 4 is a cross-sectional schematic diagram of a liquid injection mechanism provided in an embodiment of the present application;

[0029] Figure 5 is a cross-sectional schematic diagram of another liquid injection mechanism provided in an embodiment of the present application;

[0030] Figure 6 yes Figure 4 A schematic cross-sectional view of the middle seal 201;

[0031] Figure 7 yes Figure 1Cross-sectional view when the medium is filled at AA;

[0032] Figure 8 yes Figure 7 Enlarged view of the middle II;

[0033] Figure 9 This is a cross-sectional view of the liquid injection mechanism provided in an embodiment of the present application during the second type of battery cell liquid injection process when no medium is filled;

[0034] Figure 10 yes Figure 9 Enlarged view of point III in the middle;

[0035] Figure 11 This is a cross-sectional view of the liquid injection mechanism provided in an embodiment of the present application when the medium is being filled into the second type of battery cell during the liquid injection process;

[0036] Figure 12 yes Figure 11 Enlarged view of position IV in the middle;

[0037] Figure 13 is a cross-sectional view of the liquid injection mechanism provided by an embodiment of the present application during the third battery cell liquid injection process when no medium is filled;

[0038] Figure 14 yes Figure 13 Enlarged view of point V in the middle;

[0039] Figure 15 is a cross-sectional view of the liquid injection mechanism provided by an embodiment of the present application when the medium is filled in the third battery cell liquid injection process;

[0040] Figure 16 yes Figure 15 Enlarged view of the middle VI;

[0041] Figure 17 is a cross-sectional view of the liquid injection mechanism provided by an embodiment of the present application during a fourth battery cell liquid injection process when no medium is filled;

[0042] Figure 18 yes Figure 17 Enlarged view of position VII in the middle;

[0043] Figure 19 is a cross-sectional view of the liquid injection mechanism provided in an embodiment of the present application when the medium is filled in the fourth battery cell liquid injection process;

[0044] Figure 20 yes Figure 19 Enlarged view of position VIII in the middle;

[0045] Figure 21 This is an enlarged view of a liquid injection hole of a single battery provided in an embodiment of the present application;

[0046] Figure 22This is an enlarged view of another type of liquid injection hole of a single cell provided in an embodiment of the present application.

[0047] Reference numerals:

[0048] 10. Liquid injection tube; 20. Sealing assembly; 201. Sealing member; 2011. Deformation portion; 2012. First fixing portion; 2013. Second fixing portion; 2014. Connecting port; 202. Delivery tube; 2021. Delivery cavity; 20211. Main delivery cavity; 20212. Connecting cavity; 2022. Main delivery section; 2023. Connecting section; 30. Annular cavity; 40. Shell; 401. Accommodating cavity; 50. Top cover; 501. Liquid injection hole; 5011. Groove portion; Z, first direction. DETAILED DESCRIPTION

[0049] The term "plurality" in the present specification and claims means two or more. Terms such as "upper," "lower," "front," "back," "vertical," "horizontal," "top," "bottom," "inside," and "outside" indicating positions or locations are based on those shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and are therefore not to be construed as limitations on the present invention.

[0050] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0051] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and are not to be construed as limitations on the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0052] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0053] The present application provides a liquid injection mechanism, which is a liquid injection machine for injecting electrolyte into a single cell. The single cell can be a square aluminum shell battery or a cylindrical battery, etc.

[0054] refer to Figures 1 to 20 The liquid injection mechanism includes a liquid injection tube 10 and a sealing assembly 20.

[0055] The injection tube 10 is used to inject electrolyte. The injection tube 10 can be extended into the injection hole 501 of the single battery to inject the electrolyte.

[0056] The sealing assembly 20 includes a sealing member 201 . The sealing member 201 is annular and sealingly sleeved on the outer periphery of the injection tube 10 . The sealing member 201 has a radial direction and can deform in the radial direction away from the injection tube 10 .

[0057] The main function of the injection tube 10 is to inject electrolyte. The sealing assembly 20 includes a seal 201, which is annular and is sleeved on the outer circumference of the injection tube 10. The seal 201 has radial deformation ability and can expand or contract in the radial direction away from the injection tube 10. The annular structure is tightly attached to the outer circumference of the injection tube to prevent the electrolyte from leaking / overflowing from the gap between the injection tube 10 and the wall of the injection hole 501. When the injection tube 10 is extended into the injection hole 501, the seal 201 can enter the injection hole 501 along with the injection tube 10 and at least part of the seal 201 contacts the wall of the injection hole 501 and produces radial deformation. The radial expansion and deformation makes the seal 201 in close contact with the wall of the injection hole 501, thereby enhancing the sealing effect; and when disassembly is required, it can passively shrink due to deformation, reducing the resistance to exit.

[0058] It should be noted that the sealing member 201 may be made of an elastic material, such as silicone, rubber, etc., and is not specifically limited in the embodiment of the present application.

[0059] In one embodiment, reference Figure 3 、 Figure 4 、 Figure 5 、 Figure 8 、 Figure 10 and Figure 12 An annular cavity 30 is formed between the inner wall of the seal 201 and the outer wall of the injection tube 10. The seal 201 is elastic, and the annular cavity 30 can inject the medium and cause the seal 201 to deform radially.

[0060] Annular cavity 30, located between the inner wall of seal 201 and the outer wall of injection tube 10, forms an annular gap. A medium, such as gas or liquid, can be injected into annular cavity 30. This medium generates pressure, driving seal 201 to deform radially away from the center of the injection tube. Because the medium's pressure is controllable, the seal's deformation can be precisely controlled by adjusting the injection volume or pressure, achieving varying degrees of sealing or ensuring proper sealing with injection holes of varying sizes.

[0061] The seal 201 is elastic, and the elastic material has good pressure resistance and recovery properties, ensuring stable deformation under the action of medium pressure and no performance degradation after multiple cycles.

[0062] The radial deformation of the seal can simultaneously compensate for the radial tolerance and axial assembly error between the injection tube and the external interface. When no medium is injected, the seal has no contact or only slight contact with the external interface, reducing mechanical friction loss and extending the service life of the seal. The pressure fluctuation during medium injection may cause the seal to creep slightly, which helps to remove dust or residual electrolyte on the interface surface and reduce the impact of impurities on sealing performance.

[0063] In one embodiment, reference Figure 3 、 Figure 4 、 Figure 5 、 Figure 8 、 Figure 10 and Figure 12 The sealing assembly 20 further includes a delivery tube 202 , which is sleeved on the outer periphery of the injection tube 10 . The delivery tube 202 has a delivery cavity 2021 for delivering the medium, and the delivery cavity 2021 is connected to the annular cavity 30 .

[0064] Delivery tube 202 is sleeved around the outer periphery of injection tube 10, forming a coaxial double-layered pipe structure with the injection tube. A delivery chamber 2021 is provided within the delivery chamber for transporting a medium, such as gas, which flows through the delivery chamber to annular chamber 30. Delivery chamber 2021 directly communicates with annular chamber 30, forming a closed-loop path for the medium's flow. This ensures rapid and stable delivery of the medium to the annular chamber, minimizing pressure loss. The medium enters the annular chamber through the delivery chamber, thereby driving the seal to deform.

[0065] The injection tube 10 is responsible for electrolyte injection, and the delivery tube 202 is responsible for medium transmission. The two are coaxially arranged, occupying little space. The medium flow / pressure of the delivery cavity can be adjusted to match the needs of the injection process in real time.

[0066] The delivery pipe and injection pipe can be separated into independent components for easy maintenance and replacement.

[0067] Alternatively, as Figure 5As shown, the injection mechanism provided in the embodiment of the present application can also be connected to an inflation device at the seal 201, and the annular cavity 30 between the seal 201 and the injection tube 10 is filled with gas through the inflation device to deform the seal 201, thereby achieving sealing between the injection mechanism and the battery injection hole.

[0068] In one embodiment, reference Figure 3 、 Figure 4 、 Figure 5 、 Figure 8 、 Figure 10 and Figure 12 The delivery pipe 202 has a main delivery section 2022 and a connecting section 2023, both of which are sleeved on the outer circumference of the injection pipe 10. The delivery cavity 2021 includes a main delivery cavity 20211 and a connecting cavity 20212 that are connected. The inner wall of the main delivery section 2022 is spaced from the outer wall of the injection pipe 10 to form the main delivery cavity 20211. The inner wall of the connecting section 2023 is spaced from the outer wall of the injection pipe 10 to form a connecting cavity 20212. The connecting cavity 20212 is connected to the annular cavity 30, and the sealing member 201 is connected to the connecting section 2023. The injection mechanism has a first direction Z. The delivery pipe 202 and the injection pipe 10 both extend along the first direction Z. On a plane perpendicular to the first direction, the cross-sectional area of ​​the connecting cavity 20212 is smaller than the cross-sectional area of ​​the main delivery cavity 20211.

[0069] The delivery tube 202 is sleeved around the outer periphery of the injection tube 10 and extends axially along the injection mechanism. It consists of a main delivery section 2022 and a connecting section 2023. The inner wall of the main delivery section 2022 is separated from the outer wall of the injection tube 10 to form a main delivery chamber 20211, which serves as the primary delivery path for the medium. The inner wall of the connecting section 2023 is separated from the outer wall of the injection tube 10 to form a connecting chamber 20212, one end of which is connected to the main delivery chamber 20211 and the other end is connected to the annular chamber 30 of the sealing member 201. In a plane perpendicular to the first direction, the cross-sectional area of ​​the connecting chamber 20212 is smaller than that of the main delivery chamber 20211. The main delivery chamber 20211 is the primary flow area for the medium, with a larger space to accommodate a large amount of medium and ensure stable delivery. The connecting chamber 20212 is the transition region connecting the main delivery chamber and the annular chamber 30. Due to its smaller cross-sectional area, it can produce a flow-limiting or pressurizing effect on the medium.

[0070] When the medium flows from the main delivery chamber 20211 through the connecting chamber 20212, the cross-sectional area decreases. According to the principles of fluid mechanics, the medium's flow rate increases, potentially leading to increased pressure or the conversion of kinetic energy into pressure energy. When seal 201 needs to expand, the high-pressure medium enters the annular chamber 30 through the connecting chamber 20212, pushing the seal to expand radially and adhere closely to the external cavity, achieving a seal. When the seal needs to be released, the medium flows back or the pressure is released, causing the seal to elastically return to its original position. This design with a different cross-sectional area allows for rapid response to seal deformation and stable pressure with a smaller medium flow rate, avoiding the pressure fluctuations or energy loss that could result from a direct connection between the main delivery chamber and the annular chamber.

[0071] The cross-sectional area of ​​the connecting cavity 20212 is smaller than that of the main delivery cavity 20211, which can avoid rapid backflow of the medium. Even if the pressure in the main delivery cavity fluctuates, the annular cavity 30 can still maintain a certain pressure to ensure that the seal continues to seal reliably. The elastic seal 201 cooperates with the flow limiting structure to buffer the fluid shock that may occur during the injection process and reduce the risk of vibration or damage to the injection mechanism.

[0072] In one embodiment, reference Figure 3 、 Figure 4 、 Figure 5 、 Figure 8 、 Figure 10 and Figure 12 , along the first direction, the sealing member 201 is located on the side of the connecting section 2023 away from the main delivery section 2022; the connecting section 2023 has a first end away from the main delivery section 2022, and the injection tube 10 has a liquid outlet end, and the first end is staggered relative to the liquid outlet end toward the side close to the main delivery section 2022 in the first direction Z; the sealing member 201 includes a deforming portion 2011, a first fixing portion 2012 and a second fixing portion 2013, the deforming portion 2011 is connected between the first fixing portion 2012 and the second fixing portion 2013 in the first direction Z, and an annular cavity 30 is formed between the deforming portion 2011 and the injection tube 10, the first fixing portion 2012 is sealedly connected to the connecting section 2023, and the second fixing portion 2013 is sealedly connected to the injection tube 10.

[0073] The deformation portion 2011 is located between the first fixing portion 2012 and the second fixing portion 2013, forming an annular cavity 30 with the outer wall of the injection tube 10. The first fixing portion 2012 is sealedly connected to the inner wall of the connecting section 2023 (a part of the delivery tube 202), fixing one end of the seal to ensure that the medium does not leak from the connection. The second fixing portion 2013 is sealedly connected to the outer wall of the injection tube 10, fixing the other end of the seal to form the inner boundary of the annular cavity 30.

[0074] Along the first direction, the sealing member 201 is located on the side of the connecting section 2023 that is away from the main delivery section 2022. The first end of the connecting section 2023 is axially offset from the liquid outlet end of the injection tube 10, toward the main delivery section. That is, the liquid outlet end is further away from the main delivery section than the first end of the connecting section. The liquid outlet end of the injection tube 10 extends beyond the first end of the connecting section 2023, meaning that the sealing member 201 is located on the side of the liquid outlet end that is closer to the main delivery section. This ensures that the electrolyte is ejected from the liquid outlet end during injection. The sealing member is located outside the injection port or at the cavity entrance to prevent the electrolyte from directly impacting the sealing member.

[0075] The deformation part 2011 is sealed and connected to the delivery pipe and the injection pipe through the fixed parts at both ends to form an independent annular cavity 30. The medium only acts on the deformation part, causing it to expand radially and then cling to the external cavity to achieve sealing. The sealed connection of the fixed part prevents medium leakage and ensures the pressure stability of the deformation part. Even if there is fluid impact at the liquid outlet during the injection process, the seal can still maintain a reliable seal.

[0076] The liquid outlet extends beyond the first end of the connection section, meaning the seal is located outside the liquid inlet. The electrolyte enters the target cavity directly from the liquid outlet, while the seal is in an area without electrolyte contact. This prevents chemical corrosion of the seal by the electrolyte, extending its life and improving the reliability of the mechanism.

[0077] The first fixing part 2012 is connected to the delivery tube, and the second fixing part 2013 is connected to the injection tube, forming a structure with both ends fixed. The deformation part 2011 elastically deforms in the middle. When radially expanding, the fixing parts at both ends limit the axial displacement of the seal to prevent the seal from falling off or uneven deformation due to pressure offset.

[0078] In one embodiment, reference Figure 3 、 Figure 4 、 Figure 5 、 Figure 8 、 Figure 10 and Figure 12 The inner wall of the seal 201 is sealed with the outer wall of the injection tube 10. The seal 201 has an annular cavity 30 and a communication port 2014. The annular cavity 30 surrounds the outer circumference of the injection tube 10, and the communication port 2014 is connected to the annular cavity 30. The seal 201 is elastic, and the communication port 2014 allows the medium to be injected into the annular cavity 30 and enables the seal 201 to deform radially.

[0079] The inner wall of seal 201 is sealedly connected to the outer wall of injection tube 10, forming an annular cavity 30 surrounding the injection tube. A communication port 2014 is provided for the input and output of media. After media is injected through communication port 2014, pressure changes within the annular cavity drive seal 201 to deform radially. Communication port 2014 precisely controls the media pressure within annular cavity 30, enabling precise adjustment of the deformation of seal 201.

[0080] Optionally, the injection mechanism further includes a connecting piece; the connecting piece is connected between the outer wall of the injection tube 10 and the inner wall of the delivery tube 202.

[0081] The connector connects the injection tube 10 and the delivery tube 202, securing their relative positions and ensuring the structural stability of the injection mechanism. This rigid connection prevents relative displacement between the two tubes due to medium pressure and mechanical movement during the injection process. This ensures the coaxiality of the seal 201 and the injection tube 10, preventing uneven clearance in the annular cavity 30 caused by eccentricity, which could compromise the sealing effect.

[0082] Optionally, the connecting piece is a circular ring piece, which is sleeved on the outside of the injection tube 10; the connecting piece connects the outer wall of the injection tube 10 and the inner wall of the main delivery section 2022, and the connecting piece is provided with a plurality of vents to allow a medium such as gas to flow on both sides of the first direction Z of the main delivery section 2022.

[0083] A number of vent holes are evenly distributed around the circumference of the connector, serving as communication channels between the gas path of the delivery pipe 202 and the annular space.

[0084] Optionally, multiple connecting pieces are provided and spaced apart on the outer circumference of the injection pipe 10 , and the connecting pieces connect the outer wall of the injection pipe 10 and the inner wall of the main delivery section 2022 to connect the injection pipe 10 and the delivery pipe 202 together.

[0085] This embodiment also provides a liquid injection machine, which includes the liquid injection mechanism in the aforementioned embodiment.

[0086] The present application also provides a single battery, referring to Figure 1 、 Figure 2 、 Figure 21 and Figure 22 , single battery includes:

[0087] The housing 40 is provided with a receiving cavity 401;

[0088] The electrode assembly is arranged in the accommodating cavity 401;

[0089] The top cover piece 50 is connected to the shell 40 and covers the accommodating cavity 401. The top cover piece 50 is provided with an injection hole 501. The injection hole 501 is set through the top cover piece 50. The injection hole 501 can allow the injection tube 10 of any of the aforementioned embodiments to extend into. The sealing member 201 can be deformed and sealed with the hole wall of the injection hole 501.

[0090] The shell 40 is a hollow cavity structure with a accommodating chamber 401 formed inside, which is used to encapsulate core components such as electrode assemblies and electrolytes, and provide physical support and protection. The electrode assembly is composed of a stack or winding of positive electrode sheets, negative electrode sheets, diaphragms, etc. It is the core unit for the battery to achieve electrochemical reactions, and charging and discharging are completed by conducting ions through the electrolyte. The top cover sheet 50 serves as the closed end of the shell 40 and is fixed to the shell by welding, riveting, etc. to form a sealed accommodating chamber 401. It is provided with an injection hole 501 that runs through the thickness direction of the top cover sheet to provide a channel for the injection tube 10 to extend into the interior of the shell, and is the entrance for electrolyte injection.

[0091] The seal 201 conforms tightly to the wall of the injection hole 501 through radial deformation. The elastically deformable portion 2011 of the seal 201 conforms to the wall of the injection hole 501, compensating for machining tolerances between the injection tube 10 and the hole wall. Even small gaps can be filled through deformation, preventing electrolyte leakage from the gap between the injection hole and the injection tube. The pressure-driven annular cavity 30 further enhances the radial expansion force of the seal. The elastic deformation characteristics of the seal 201 enable it to adapt to injection holes 501 of different diameters, making it compatible with multiple products without replacing hardware, reducing equipment conversion costs.

[0092] In one embodiment, reference Figure 22 A groove portion 5011 is provided on the hole wall of the liquid injection hole 501 , and the groove portion 5011 can accommodate at least part of the sealing member 201 .

[0093] The groove portion 5011 is located on the hole wall of the injection hole 501 and is an annular or partially recessed structure for accommodating at least a portion of the seal 201. The groove portion 5011 provides space for radial deformation of the seal 201, and of course can also provide space for installation and positioning, and enhance the stability of the sealing fit.

[0094] After the medium is injected into the annular cavity 30, the seal 201 expands radially, filling the gap between the wall of the injection hole 501 and the outer wall of the injection tube 10. At this point, the groove 5011 provides space for the expanded seal, preventing deformation and failure due to excessive squeezing. At the same time, the limiting effect of the groove ensures a tighter fit between the seal and the hole wall. After the seal 201 expands, a portion of it embeds in the groove 5011, while the other portion clings to the non-grooved area of ​​the injection hole 501, forming a stepped sealing structure. This design increases the complexity of the leakage path and significantly improves leak prevention capabilities.

[0095] The groove portion 5011 provides a buffer space for the expansion of the seal, preventing the seal from being plastically deformed due to mechanical squeezing when the injection tube is inserted or excessive medium pressure, ensuring that the seal is always within the elastic working range and maintaining stable sealing performance.

[0096] In one embodiment, reference Figure 22 The groove portion 5011 is arranged in an annular shape and surrounds at least a portion of the circumference of the hole wall.

[0097] In other embodiments, a plurality of groove portions 5011 may be provided, and the plurality of groove portions 5011 may be spaced apart along the circumferential direction of the hole wall.

[0098] Multiple grooves 5011 are continuously arranged around the circumference of the injection hole 501, forming a complete or partial annular recessed structure. These continuous annular grooves provide circumferential support and accommodation for the seal 201. After expansion, the seal forms a continuous, closed sealing ring with the injection hole 501 wall and the outer wall of the injection tube 10. This annular structure evens out the circumferential stress on the seal during expansion, reducing tearing or fatigue wear of the seal due to localized stress concentration.

[0099] Alternatively, the plurality of groove portions 5011 may be uniformly or non-uniformly distributed along the circumference of the hole wall, with unrecessed hole wall areas left between them. The plurality of independent grooves may be spaced apart along the circumference, with the unrecessed hole wall areas serving as rigid support areas, forming an alternating structure with the groove portions.

[0100] Whether annular or spaced grooves, they can provide positioning support and deformation space for the seal, and can adapt to different injection processes and battery types. By adjusting the form, number and distribution of the grooves, the sealing performance can be flexibly optimized.

[0101] like Figure 10 、 Figure 14 、 Figure 18 、 Figure 22 As shown, the cross section of the groove portion along the first direction Z is rectangular, semicircular, or arc-shaped, etc., and multiple layers of groove portions may also be provided along the first direction Z.

[0102] Finally, it should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or terminal device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or terminal device that includes the element.

Claims

1. A liquid injection mechanism, characterized in that: include: a liquid injection pipe (10), the liquid injection pipe (10) being used for injecting electrolyte; A sealing assembly (20) comprising a sealing member (201), the sealing member (201) being arranged in an annular shape and sealingly sleeved on the outer periphery of the liquid injection tube (10), the sealing member (201) having a radial direction, and the sealing member (201) being capable of deforming in a direction away from the liquid injection tube (10) in the radial direction.

2. The liquid injection mechanism according to claim 1, characterized in that: An annular cavity (30) is formed between the inner wall of the sealing member (201) and the outer wall of the injection tube (10); the sealing member (201) is elastic; the annular cavity (30) can inject a medium and cause the sealing member (201) to deform in the radial direction.

3. The liquid injection mechanism according to claim 2, characterized in that: The sealing assembly (20) further comprises a delivery tube (202), wherein the delivery tube (202) is sleeved on the outer circumference of the injection tube (10), and the delivery tube (202) has a delivery cavity (2021) for delivering the medium, and the delivery cavity (2021) is in communication with the annular cavity (30).

4. The liquid injection mechanism according to claim 3, characterized in that: The delivery pipe (202) comprises a main delivery section (2022) and a connecting section (2023) both of which are sleeved on the outer circumference of the injection pipe (10); the delivery cavity (2021) comprises a main delivery cavity (20211) and a connecting cavity (20212) that are connected; the inner wall of the main delivery section (2022) is spaced apart from the outer wall of the injection pipe (10) to form the main delivery cavity (20211); the inner wall of the connecting section (2023) is spaced apart from the outer wall of the injection pipe (10) to form the connecting cavity (20212); the connecting cavity (20212) is connected to the annular cavity (30); and the sealing member (201) is connected to the connecting section (2023); The injection mechanism has a first direction (Z), the delivery tube (202) and the injection tube (10) both extend along the first direction (Z), and on a plane perpendicular to the first direction (Z), the cross-sectional area of ​​the connecting cavity (20212) is smaller than the cross-sectional area of ​​the main delivery cavity (20211).

5. The liquid injection mechanism according to claim 4, characterized in that: Along the first direction (Z), the sealing member (201) is located on a side of the connecting section (2023) away from the main delivery section (2022); the connecting section (2023) has a first end away from the main delivery section (2022); the liquid injection pipe (10) has a liquid outlet end, and the first end is staggered relative to the liquid outlet end toward a side close to the main delivery section (2022) in the first direction (Z); The sealing member (201) comprises a deformation portion (2011), a first fixing portion (2012) and a second fixing portion (2013); the deformation portion (2011) is connected between the first fixing portion (2012) and the second fixing portion (2013) in the first direction (Z); the annular cavity (30) is formed between the deformation portion (2011) and the injection tube (10); the first fixing portion (2012) is sealedly connected to the connecting section (2023); and the second fixing portion (2013) is sealedly connected to the injection tube (10).

6. The liquid injection mechanism according to claim 1, characterized in that: The inner wall of the sealing member (201) is sealedly connected to the outer wall of the injection tube (10); the sealing member (201) has an annular cavity (30) and a communication port (2014); the annular cavity (30) surrounds the outer circumference of the injection tube (10); and the communication port (2014) is communicated with the annular cavity (30); the sealing member (201) is elastic; the communication port (2014) allows a medium to be injected into the annular cavity (30) and enables the sealing member (201) to deform along the radial direction.

7. A liquid injection machine, characterized in that: The invention comprises a liquid injection mechanism as described in any one of claims 1 to 6.

8. A single cell battery, characterized in that: include: A housing (40), wherein the housing (40) is provided with a receiving cavity (401); an electrode assembly, the electrode assembly being arranged in the accommodating cavity (401); A top cover sheet (50), the top cover sheet (50) is connected to the shell (40) and covers the accommodating cavity (401), the top cover sheet (50) is provided with a liquid injection hole (501), the liquid injection hole (501) is set through the top cover sheet (50), the liquid injection tube (10) according to any one of claims 1 to 7 can be inserted into the liquid injection hole (501), and the sealing member (201) can be deformed and sealed with the hole wall of the liquid injection hole (501).

9. The single cell according to claim 8, characterized in that: A groove portion (5011) is provided on the hole wall of the liquid injection hole (501), and the groove portion (5011) is capable of accommodating at least a portion of the sealing member (201).

10. The single cell according to claim 9, characterized in that: The groove portion (5011) is arranged in an annular shape and surrounds at least part of the circumference of the hole wall; or, there are multiple groove portions (5011), and the multiple groove portions (5011) are arranged at intervals along the circumference of the hole wall.

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