A rivet gun

Abstract

This application discloses a rivet gun used for sealing the electrolyte injection holes of battery cells, which can reduce the damage of electrolyte to the components inside the rivet gun and extend the service life of the rivet gun. The rivet gun includes a rivet mechanism and an adsorption mechanism. The adsorption mechanism is used to discharge broken rivet rods from the rivet gun, and has an interconnected liquid storage chamber and a negative pressure tube. The rivet mechanism is used to break the rivet rods, and includes a rivet-pile tube inserted into the liquid storage chamber. The rivet-pile tube is movable relative to the liquid storage chamber along its axial direction, and the rivet-pile tube is spaced at a preset distance from the negative pressure tube. The inner diameter of the negative pressure tube is L, the inner diameter of the liquid storage chamber is 2, the outer diameter of the rivet-pile tube is 3, and the preset distance L satisfies: 0.8 ≤ 11.

Description

Technical Field

[0001] This application relates to the field of battery processing equipment technology, and in particular to a rivet gun. Background Technology

[0002] A rivet gun is a tool used to install blind rivets, widely used in metal processing, automotive manufacturing, battery processing, aerospace, and other fields. It can replace welding processes and effectively solve the problem of weld penetration in sheet metal. The rivet gun includes a pull rod mechanism to transmit pulling force, pulling the rivet core outwards. After a single battery cell is filled with electrolyte, the filling port needs to be sealed. This sealing is achieved using a rivet gun. However, after riveting, the broken rivet shank of the blind rivet needs to be discharged from the tail end of the rivet gun. During this process, a small amount of electrolyte enters the rivet gun along with the rivet shank. Because the electrolyte is corrosive, it will corrode the internal parts of the rivet gun, reducing its lifespan. Summary of the Invention

[0003] The rivet gun provided in this application can reduce the damage caused by electrolyte to the internal parts of the rivet gun and improve the service life of the rivet gun.

[0004] This application provides a rivet gun comprising a rivet mechanism and a suction mechanism. The suction mechanism is used to discharge broken rivet rods from the rivet gun, and has a liquid storage chamber and a negative pressure tube communicating with each other. The rivet mechanism is used to break the rivet rods, and includes a rivet-dispensing tube inserted into the liquid storage chamber. The rivet-dispensing tube is movable relative to the liquid storage chamber along its axial direction, and the rivet-dispensing tube is spaced apart from the negative pressure tube by a predetermined distance. The inner diameter of the negative pressure tube... 1. The inner diameter of the liquid storage chamber 2. The outer diameter of the nail pack tube is 3. The preset distance L satisfies: .

[0005] In the above embodiment, a small amount of electrolyte is drawn into the rivet gun during riveting. The electrolyte flows towards the tail end of the rivet gun through the pin-mounting tube. Part of the electrolyte is drawn into the negative pressure tube and directly discharged from the rivet gun, while the remaining electrolyte flows into the storage chamber. The storage chamber can seal and contain the remaining electrolyte, preventing it from flowing into other areas of the rivet gun and affecting other components. In addition, since the negative pressure tube is connected to the storage chamber, and the pin-mounting tube is spaced at a preset distance from the negative pressure tube, the strong airflow formed in the negative pressure tube can continue to discharge the remaining electrolyte in the storage chamber, avoiding crystallization problems caused by long-term stagnation of electrolyte in the storage chamber.

[0006] when When the designed value exceeds the range mentioned above, the volume of the liquid storage chamber is relatively large, and under the same gas pressure range, the electrolyte in the liquid storage chamber can be drawn out, but it is more difficult to remove the nail rods from the nail-holding tube. When When the designed value is lower than the above-mentioned design value, the volume of the liquid storage chamber is relatively small. Under the same gas pressure range, the nail rods in the nail-pile tube can be discharged, but the electrolyte at the corners of the liquid storage chamber is not easily discharged. This can be addressed by rationally designing the inner diameter of the negative pressure pipe. 1. Inner diameter of the liquid storage chamber 2. Outer diameter of the nail pack tube 3. The relationship between the distance L between the nail-laying tube and the negative pressure tube: When nails are laid under negative pressure, a strong airflow pressure difference can be formed at the liquid storage chamber, which will discharge the nail rods in the nail-laying tube and also adsorb and discharge the electrolyte in the liquid storage chamber. Attached Figure Description

[0007] Figure 1 This is a structural schematic diagram of a blind rivet in related technologies;

[0008] Figure 2 A diagram showing the state changes of the cover plate assembly and the blind rivet during riveting in related technologies;

[0009] Figure 3 This is a structural diagram of a rivet gun in related technologies;

[0010] Figure 4 This is a schematic diagram of the structure of a rivet gun provided in one embodiment of this application;

[0011] Figure 5 This is a schematic diagram of the riveting mechanism and the adsorption mechanism provided in one embodiment of this application;

[0012] Figure 6 This is a schematic diagram of the structure of the nail tube assembly and adsorption mechanism provided in one embodiment of this application;

[0013] Figure 7 This is a schematic diagram of the structure of the nail-laying tube and the adsorption mechanism provided in one embodiment of this application;

[0014] Figure 8 A schematic diagram of the structure of the nail-laying tube and the adsorption mechanism provided in another embodiment of this application;

[0015] Figure 9 This is a schematic diagram of the structure of the nail-laying tube and the adsorption mechanism provided in another embodiment of this application.

[0016] Related technical figure labels:

[0017] 01-Core rod; 02-Nail body; 011-Nail rod; 012-Head; 013-Break groove; 021-Nail cap; 022-Sleeve; 023-Expansion section; 00-Rivet gun; 001-Claw; 002-Sleeve; 003-Top rod assembly; 004-Spring; 005-Spring sleeve; 0031-Top head; 0032-Top rod; 000-Cover plate assembly; 006-Adsorption mechanism; 0061-Negative pressure tube.

[0018] Reference numerals in the accompanying drawings of the embodiments of this application:

[0019] 1-Clamping sleeve; 2-Claw; 3-Pin tube assembly; 301-Top rod; 302-Pin tube;

[0020] 110 - Adsorption mechanism; 111 - Liquid storage chamber; 112 - Negative pressure pipe; 1111 - First surface; 1112 - Second surface; 1101 - Body; 1102 - First opening; 1103 - First seal; 1104 - Plunger; 1105 - Second opening; 1106 - Second seal; 11041 - Boss; 1107 - Liquid storage tank; 11071 - First sidewall; 11072 - Second sidewall; 11073 - Bottom wall of the tank;

[0021] 101-Gas chamber; 1021-Pushing surface; 4-Housing shell; 5-Gun head assembly; 501-Tip; 6-Transmission mechanism; 601-Lead screw; 602-Lead screw nut; 100-Motor; 7-First sealing ring; 8-Second sealing ring; 9-Third sealing ring; 102-Pushing section; 103-Extension section; 10-Gas pipe connector; 401-Allowing hole. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description of the application is provided in conjunction with the accompanying drawings and embodiments.

[0023] The terminology used in the following embodiments is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. As used in the specification and appended claims of this application, the singular expressions “a,” “an,” “the,” “the,” “the,” and “this” are intended to also include expressions such as “one or more” unless the context clearly indicates otherwise.

[0024] References to “an embodiment” or “a specific embodiment” as used in this specification mean that one or more embodiments of this application include a particular feature, structure, or characteristic described in connection with that embodiment. The terms “comprising,” “including,” “having,” and variations thereof mean “including, but not limited to,” unless otherwise specifically emphasized.

[0025] A single battery cell mainly consists of a housing that encloses a cavity, a battery cover assembly, a cell assembly located within the cavity, and electrolyte filling the cavity through an injection hole on the battery cover assembly. In some related technologies, after the battery cell has been filled with electrolyte, the injection hole is typically sealed using a sealing pin. The sealing pin is connected to the cover assembly by laser welding. However, laser welding equipment is expensive, increasing the production cost of the battery cell. Furthermore, the welding positioning requirements are high, making it prone to weld misalignment and incomplete welding, which increases the difficulty of assembling the sealing pin and affects the yield of the battery cell.

[0026] Using blind rivets instead of welded sealing pins to plug the electrolyte injection holes improves assembly efficiency and increases the yield of individual battery cells. During battery cell manufacturing, the cell assembly is first placed inside the battery casing, then the battery cover assembly is fitted onto the casing. Electrolyte is then injected into the cavity formed by the battery cover assembly and the battery casing through the electrolyte injection hole on the battery cover assembly. Next, a blind rivet is inserted into the electrolyte injection hole and riveted using a rivet gun. This causes the rivet body to deform within the injection hole, resulting in an interference fit that seals the hole.

[0027] A blind rivet is a fastener that is installed from one side and is suitable for situations where it is not possible to operate from the back. Figure 1 This is a structural diagram of a blind rivet in related technologies, such as... Figure 1 As shown, a blind rivet consists of two parts: a core rod 01 and a rivet body 02. It is fixed by deformation through the pulling force of a rivet gun. The core rod 01 includes a head 012 and a shank 011. The shank 011 is a smooth or toothed metal rod used to transmit tensile force. The head 012 is located at the top of the shank 011 and is typically spherical or flat. A fracture groove 013, an annular groove, is provided on the shank 011 near the head 012. The rivet body 02 is sleeved on the outside of the core rod 01 and includes a rivet head 021, a sleeve 022, and an expansion section 023. The rivet head 021 and the expansion section 023 are located at opposite ends of the sleeve 022. Figure 2 This is a diagram showing the state changes of the cover plate assembly and the blind rivet during riveting in related technologies, such as... Figure 2 As shown, during riveting, the head of the rivet gun 00 presses against the nail head 021 around the injection hole of the cover plate assembly 000, and pulls the end of the nail rod 011 away from the head 012. The head 012 causes the expansion section 023 of the nail body 02 to deform and roll inward. When the pulling force reaches the preset value, the nail rod 011 breaks at the fracture groove 013, fixing the nail body 02 and the head 012 to the cover plate assembly 000.

[0028] Figure 3 This is a structural diagram of a rivet gun in related technologies, such as... Figure 3As shown, in some related technologies, a rivet gun typically includes a jaw 001, a sleeve 002, a push rod assembly 003, a spring 004, a spring sleeve 005, and a suction mechanism 006. The jaw 001 is disposed within the sleeve 002. The push rod assembly 003 is located on the side of the jaw 001 opposite to the muzzle of the rivet gun. The push rod assembly 003 includes a push head 0031 and a push rod 0032 located at the rear end of the push head 0031. A spring 004 is sleeved on the outer wall of the push rod 0032, and a spring sleeve 005 is disposed outside the spring 004. The spring 004 exerts its elastic force on the push rod 0032 to press against the jaw 001. During riveting, the rivet shank extends into the jaw and the rivet shank. Sleeve 002 drives jaw 001 to move backward. Guided by the inner conical surface of sleeve 002, jaw 001 automatically tightens and clamps the rivet shank. As the pulling force increases and reaches a preset value, the rivet shank is broken off, and the broken rivet shank remains inside the push rod. Adsorption mechanism 006 is installed at the tail end of the rivet gun. Adsorption mechanism 006 has a negative pressure tube 0061. The end of push rod 0032 away from the push head 0031 is inserted into the negative pressure tube 0061. Both push rod 0032 and negative pressure tube 0061 are hollow structures. After the rivet shank is broken off, it is adsorbed by adsorption mechanism 006, passes through push rod 0032 and negative pressure tube 0061, and is discharged from the tail end of the rivet gun.

[0029] During riveting, the rivet gun nozzle presses against the rivet cap 021 against the battery cover assembly 000. The suction mechanism 006 draws a small amount of electrolyte from the battery casing. The electrolyte enters the push rod 0032 and then flows into the negative pressure tube 0061, from which it can be discharged from the tail end of the rivet gun. Because the push rod 0032 moves back and forth relative to the negative pressure tube 0061 during riveting, the electrolyte flows between the outer wall of the push rod 0032 and the inner wall of the negative pressure tube 0061, and then flows along the negative pressure tube 0061 towards the front end into the cavity of the rivet gun. If the residual electrolyte in the gun cannot be effectively discharged during each rivet removal process, the residual electrolyte will crystallize and cause corrosion of the parts inside the rivet gun, leading to equipment shutdown or even rendering the rivet gun unusable.

[0030] In view of this, embodiments of this application provide a rivet gun that can avoid damage to the internal components of the rivet gun caused by electrolyte, thereby improving the service life of the rivet gun. Embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0031] Figure 4 A schematic diagram of the structure of a rivet gun provided in one embodiment of this application is shown below. Figure 4As shown, an embodiment of this application provides a rivet gun including a rivet mechanism and an adsorption mechanism 110. The rivet mechanism is located at the front end of the adsorption mechanism 110 and is used to pull off the rivet rod. The rivet mechanism includes a clamping sleeve 1, a jaw 2, and a rivet tube assembly 3. The rivet tube assembly 3 is disposed within the clamping sleeve 1 and is movable relative to the clamping sleeve 1. The jaw 2 is also disposed within the clamping sleeve 1. The end of the clamping sleeve 1 has a pushing surface 1021 facing the jaw 2. The outer wall of the jaw 2 abuts against the pushing surface 1021, and the jaw 2 is slidable along the pushing surface 1021. The rivet tube assembly 3 is a hollow structure, including a top rod 301 and a rivet tube 302. The top rod 301 is fixedly connected to the end of the rivet tube 302. The rivet rod is slidable within the hollow cavity of the rivet tube assembly.

[0032] An adsorption mechanism 110 is installed at the tail end of the rivet gun to eject the rivet rod. The adsorption mechanism 110 has a liquid storage chamber 111 and a negative pressure tube 112 that are interconnected. The end of the rivet-dispensing tube 302 away from the push rod 301 is inserted into the liquid storage chamber 111 and can move relative to the liquid storage chamber 111 along the axial direction of the tube. The rivet-dispensing tube 302 and the negative pressure tube 112 are spaced at a predetermined distance to prevent the tube 302 from obstructing the gas flow between the negative pressure tube 112 and the liquid storage chamber 111. The inner diameter of the negative pressure tube 112... 1. Inner diameter of the liquid storage chamber 111 2. The outer diameter of the nail pack tube 302 is 3. Preset distance L, satisfying: .

[0033] In the above embodiment, a small amount of electrolyte is drawn into the rivet gun during riveting. The electrolyte flows towards the tail end of the rivet gun through the pin-mounting tube 302. Part of the electrolyte is drawn into the negative pressure tube 112 and directly discharged from the rivet gun, while some residual electrolyte flows into the storage chamber 111. The storage chamber 111 seals and contains the residual electrolyte, preventing it from flowing into other areas of the rivet gun and affecting other components. Furthermore, since the negative pressure tube 112 is connected to the storage chamber 111, and the pin-mounting tube 302 is spaced at a predetermined distance from the negative pressure tube 112, the strong airflow formed in the negative pressure tube 112 can continue to discharge the residual electrolyte in the storage chamber 111, avoiding crystallization problems caused by long-term retention of electrolyte in the storage chamber 111.

[0034] when When the designed value is higher than the above-mentioned design value range, the volume of the liquid storage chamber 111 is relatively large, and under the same gas pressure range, the electrolyte in the liquid storage chamber 111 can be drawn out, but it is more difficult to remove the nail rod in the nail tube 302. When When the designed value is lower than the above-mentioned design value, the volume of the liquid storage chamber 111 is relatively small. Under the same gas pressure range, the nail rods in the nail-removing pipe 302 can be discharged, but the electrolyte at the corner of the liquid storage chamber 111 is not easily discharged. This can be addressed by rationally designing the inner diameter of the negative pressure pipe 112. 1. Inner diameter of the liquid storage chamber 111 2. Outer diameter of nail tube 302 3. The relationship between the distance L between the nail-laying tube 302 and the negative pressure tube 112: When nails are laid under negative pressure, a strong airflow pressure difference can be formed at the liquid storage chamber 111, which will discharge the nail rods in the nail-laying tube 302 and also absorb and discharge the electrolyte in the liquid storage chamber 111. The values ​​can be, for example, 0.8, 1.3, 1.6, 2.3, 2.4, 2.5, 2.7, 3.2, 3.5, 3.5, 3.6, 3.8, 4.5, 4.8, 5.6, 7, 8, 11, etc., but are not limited to these values.

[0035] In one embodiment, the inner diameter of the negative pressure pipe 112 1. Satisfies: 3mm≤ 1≤5mm. When the inner diameter of the negative pressure tube 112 is larger than the above-mentioned setting range, under the same air pressure range, the time for the instantaneous pressure difference between the negative pressure tube 112 and the liquid storage chamber 111 to be generated is longer, which affects the absorption of electrolyte in the liquid storage chamber 111. When the inner diameter of the negative pressure tube 112 is smaller than the above-mentioned setting range, the channel is narrower, and the nail rod is not easy to be discharged from the negative pressure tube 112, which can easily cause blockage of the negative pressure tube 112. The value of 1 can be, for example, 3mm, 3.1mm, 3.2mm, 3.5mm, 3.9mm, 4mm, 4.2mm, 4.5mm, 4.8mm, 5mm, etc., but is not limited to these values.

[0036] In one embodiment, the inner diameter of the liquid storage chamber 111 2. Satisfies: 10mm ≤ 2≤13mm. When the inner diameter of the liquid storage chamber 111 is larger than the above-mentioned set range, the pressure difference between the liquid storage chamber 111 and the negative pressure pipe 112 is larger, while the pressure difference between the nail-pile pipe 302 and the negative pressure pipe 112 is smaller, affecting the nail-pile arrangement. When the inner diameter of the liquid storage chamber 111 is smaller than the above-mentioned set range, the volume of the liquid storage chamber 111 is smaller, and the same amount of electrolyte will occupy more space in the liquid storage chamber 111, causing the electrolyte to submerge the seal outside the nail-pile pipe 302, causing the seal to be corroded (this seal refers to the first seal 1103, which will be described in detail later). The value of 2 can be, for example, 10mm, 10.5mm, 11mm, 11.5mm, 11.8mm, 12mm, 12.2mm, 12.5mm, 12.9mm, 13mm, etc., but is not limited to these values.

[0037] In one embodiment, the outer diameter of the nail pack tube 302 is... 3. Satisfies: 2mm≤ 3≤6mm. When the outer diameter of the nail-laying tube 302 is larger than the above-mentioned setting range, it is difficult to form a pressure difference between the nail-laying tube 302 and the negative pressure tube 112, making it impossible to drain the electrolyte inside the nail-laying tube 302. When the outer diameter of the nail-laying tube 302 is smaller than the above-mentioned setting range, it affects the movement of the nail rod inside the nail-laying tube 302. The value of 3 can be, for example, 2mm, 2.5mm, 3mm, 3.4mm, 3.7mm, 4mm, 4.5mm, 5mm, 6mm, etc., but is not limited to these values.

[0038] In one embodiment, the preset distance L between the nail-laying tube 302 and the negative pressure tube 112 satisfies: 1mm ≤ L ≤ 3mm. When the preset distance is greater than the above-mentioned setting range, the pressure difference between the nail-laying tube 302 and the negative pressure tube 112 is small, affecting the nail-laying. When the preset distance is less than the above-mentioned setting range, most of the pressure in the negative pressure tube 112 is transmitted to the nail-laying tube 302, making it difficult for the electrolyte in the liquid storage chamber 111 to be discharged. The value of L can be, for example, 1mm, 1.2mm, 1.5mm, 1.9mm, 2mm, 2.1mm, 2.5mm, 2.8mm, 3mm, etc., but is not limited to these values.

[0039] The aforementioned adsorption mechanism 110 includes a negative pressure generator (not shown in the figure), which provides negative pressure to the rivet gun. The negative pressure generator is connected to the negative pressure tube 112, so that the broken rivet rod can be adsorbed and moved towards the tail end away from the gripper 2, and then discharged from the tail end.

[0040] Figure 5 This is a schematic diagram of the riveting mechanism and the adsorption mechanism provided in one embodiment of this application. Figure 6 This is a schematic diagram of the structure of the nail-packing tube assembly and the adsorption mechanism provided in one embodiment of this application. Figure 5 and Figure 6As shown, in one embodiment, the inner wall of the liquid storage chamber 111 has a first surface 1111 and a second surface 1112 connected to each other. The first surface 1111 is parallel to the nail-pile tube 302, and the second surface 1112 forms an angle with the nail-pile tube 302. That is, the first surface 1111 is a cylindrical surface, and the second surface 1112 is a frustum. The second surface 1112 has a first edge and a second edge. The first edge is connected to the negative pressure tube 112, and the second edge is connected to the first surface 1111. The diameter of the second edge is larger than the diameter of the first edge. The second surface 1112 gradually decreases in size from the front end to the rear end, so that when the electrolyte in the liquid storage chamber 111 is adsorbed, it flows more smoothly from the sloped second surface 1112 into the negative pressure tube 112, reducing dead corners in the liquid storage chamber 111 and thus reducing the possibility of electrolyte residue in the liquid storage chamber 111.

[0041] In one specific embodiment, the angle between the second surface 1112 and the nail tube 302 is in the range of 115°-120°.

[0042] Along the direction perpendicular to the pin-lay tube 302, the pin-lay tube 302 at least partially overlaps with the vertical projection of the first surface 1111.

[0043] In one embodiment, the adsorption mechanism 110 includes a body 1101 with an opening at one end facing the nail-pile tube 302, referred to as the first opening 1102. The nail-pile tube 302 is inserted into the liquid storage chamber 111 through the first opening 1102. A first sealing element 1103 is provided on the inner wall of the first opening 1102 and the outer wall of the nail-pile tube 302 to seal the gap between the nail-pile tube 302 and the first opening 1102. In this embodiment, the liquid storage chamber 111 is a one-piece molded structure, and the opening at the end of the body 1101 facing the nail-pile tube 302 is relatively small, with the diameter of the opening being approximately the same as the diameter of the nail-pile tube 302. Providing only one first sealing element 1103 ensures good sealing of the liquid storage chamber 111.

[0044] Since the pin-mount tube 302 can move relative to the liquid storage chamber 111 during riveting and pin removal, to prevent liquid droplets from entering between the first seal 1103 and the pin-mount tube 302 during movement, in one embodiment, an oil film may be provided between the first seal 1103 and the pin-mount tube 302 to improve sealing and reduce friction between the pin-mount tube 302 and the first seal 1103.

[0045] Figure 7 This is a schematic diagram of the structure of the nail-laying tube and the adsorption mechanism provided in one embodiment of this application, as shown below. Figure 7As shown, in the above embodiment, the opening of the liquid storage chamber 111 is relatively small, which is not conducive to the assembly and cleaning of the interior of the liquid storage chamber 111. In another embodiment, the adsorption mechanism 110 may further include a plunger 1104. The body 1101 has an opening at one end facing the nail-pile tube 302, which is called the second opening 1105. The diameter of the second opening 1105 is the inner diameter of the liquid storage chamber 111, and the plunger 1104 is used to seal the second opening 1105. The second opening 1105 is relatively larger than the first opening 1102, and the plunger 1104 is detachably installed in the second opening 1105, which facilitates the cleaning of the interior of the liquid storage chamber 111. The plunger 1104 has a through hole through which the nail-pile tube 302 passes. To prevent electrolyte from flowing out between the pin pack tube 302 and the plunger 1104, the first sealing element 1103 is installed between the inner wall of the through hole and the outer wall of the pin pack tube 302 to seal the gap between the pin pack tube 302 and the plunger 1104.

[0046] Continue to refer to Figure 7 In one embodiment, the adsorption mechanism 110 further includes at least one second sealing element 1106, which is installed between the plunger 1104 and the body 1101 to seal the gap between the plunger 1104 and the body 1101. The number of second sealing elements 1106 can be two, three, etc., and this application does not impose a specific limitation, in order to improve the sealing effect between the plunger 1104 and the body 1101.

[0047] In a further embodiment, a boss 11041 may be provided on the outer periphery of the plunger 1104 away from the negative pressure pipe 112. The boss 11041 abuts against the end face of the body 1101 facing the front end of the rivet gun, which can improve the sealing effect. At the same time, the boss 11041 can extend the flow path of the electrolyte, and it is only possible for the electrolyte to flow out of the storage chamber 111 after a large amount of electrolyte has accumulated in the storage chamber 111, thus increasing the difficulty for the electrolyte to flow out of the storage chamber 111.

[0048] When using a rivet gun to rivet the electrolyte injection hole, a common arrangement is to have the gun nozzle facing the battery cell below the rivet gun, meaning the adsorption mechanism 110 is positioned above the rivet mechanism. In this arrangement, the surface of the plunger 1104 facing the negative pressure tube 112 serves as the bottom wall of the electrolyte storage chamber 111. When there is a large amount of electrolyte in the storage chamber 111, droplets will collect on the plunger 1104 under gravity and may flow into the gap between the plunger 1104 and the pin-mounting tube 302, contacting the first seal 1103. This can cause corrosion of the first seal 1103.

[0049] To reduce corrosion of the first seal 1103, in one embodiment, the inner wall of the liquid storage chamber 111 may also be provided with a liquid storage tank 1107, which is located at the end of the first surface 1111 near the negative pressure pipe 112. When the electrolyte enters the liquid storage chamber 111 from the pin-pile pipe 302, it usually splashes into the liquid storage chamber 111 in the form of droplets due to the airflow adsorption of the adsorption mechanism 110. Since the opening of the pin-pile pipe 302 is close to the opening of the negative pressure pipe 112, providing a liquid storage tank 1107 at the end of the liquid storage chamber 111 near the negative pressure pipe 112 helps to collect the droplets splashed out of the pin-pile pipe 302, thereby reducing the amount of electrolyte falling into the bottom of the liquid storage chamber 111.

[0050] Figure 8 A schematic diagram of the structure of the nail-laying tube and the adsorption mechanism provided for another embodiment of this application is shown below. Figure 8 As shown, in a further embodiment, the liquid storage tank 1107 is inclined toward the negative pressure pipe 112. The liquid storage tank 1107 includes a first side wall 11071, a second side wall 11072, and a bottom wall 11073. The first side wall 11071 and the second side wall 11072 are arranged opposite to each other and are respectively connected to the bottom wall 11073. The first side wall 11071 is connected to the second surface 1112 and is in the same plane. During riveting, a small amount of liquid droplets splash into the liquid storage tank 1107. Because the liquid storage tank 1107 is inclined, the droplets in the liquid storage tank 1107 flow toward the bottom wall 11073 under the action of gravity and are not easy to flow out of the liquid storage tank 1107 and fall onto the plunger 1104. Furthermore, the liquid storage tank 1107 is inclined toward the negative pressure pipe 112, and the first side wall 11071 is connected to the second surface 1112 and is in the same plane, which is conducive to the liquid droplets being sucked into the negative pressure pipe 112 and discharged.

[0051] Figure 9 A schematic diagram of the structure of the nail-laying tube and the adsorption mechanism provided for another embodiment of this application is shown below. Figure 9 As shown, in a further embodiment, the first surface 1111 may be provided with a plurality of liquid storage tanks 1107, which are arranged at intervals along the axial direction of the liquid storage cavity 111. The plurality of liquid storage tanks 1107 can store more droplets, reducing the occurrence of droplets falling onto the surface of the plunger 1104.

[0052] In one specific embodiment, the inner diameter of the negative pressure pipe 112 For example, it can be 3.4mm, and the outer diameter of the nail tube 302 is... 3. For example, the inner diameter of the liquid storage chamber 111 can be 4mm. 2. For example, it can be 12mm. When the pin-mount tube 302 moves to the lowest point of the working position (the position where the pin-mount tube is furthest from the negative pressure tube) during the pin-removal (releasing the clamping jaws) movement, and the relative distance between the pin-mount tube 302 and the plunger 1104 is 0.5mm, 1 and The ratio of 2 is 1:3. At this point, the volume of the storage chamber 111 is approximately 0.58 ml. The rivet gun reaches its optimal state, at which point the residual electrolyte in the storage chamber 111 and the residual electrolyte in the negative pressure tube 112 can be instantly discharged under the maximum pressure difference. Under this design, the strong airflow negative pressure can effectively discharge the residual electrolyte in the chamber, reducing the crystallization problem caused by long-term electrolyte retention.

[0053] The following is a detailed introduction to the riveting mechanism.

[0054] Continue to refer to Figure 3 In related technologies, the spring 004 of the rivet gun may fatigue after a period of use, causing a decrease in the preload of the spring 004. This prevents the push rod 0032 from properly engaging the chuck 001, resulting in a decrease in the clamping force of the chuck 001. During riveting, the chuck 001 is prone to slipping against the rivet rod 011, causing the rivet gun's pulling force to fall below the preset value, leading to an abnormal breakage of the fracture groove 013 in the core rod 01.

[0055] Continue to refer to Figures 4-5 In one embodiment of this application, the clamping sleeve 1 has a gas chamber 101 located on the side of the push rod 301 opposite to the gripper 2. The gripper 2 is located between the abutment surface 1021 and the push rod 301, and the gripper 2 and the push rod 301 are arranged sequentially along the axial direction of the clamping sleeve 1, with the push rod 301 abutting against the gripper 2. The gas chamber 101 is filled with compressed gas, which has pressure that always provides a thrust to the push rod 301 toward the gripper 2. During riveting, the clamping sleeve 1 applies a positive (from front end to rear end) pulling force to the gripper 2, causing the gripper 2 to retract. The riveting tube assembly 3 moves within the clamping sleeve 1 under bidirectional thrust. The compressed gas applies a counter-thrust force toward the gripper 2 to the push rod 301, ensuring that the gripper 2 remains in contact with the abutment surface 1021. Compared to using a spring to provide the counter-push force, using a gas chamber 101 to use air pressure as the counter-push force on the gripper 2 can make the gripping force of the gripper 2 more reliable and will not cause the gripping force to decrease due to spring fatigue.

[0056] In one embodiment, the wall of the clamping sleeve 1 is provided with a vent hole, and an air pipe connector 10 is installed in the vent hole for connecting to an external air source. When the air pressure in the gas chamber 101 decreases due to air leakage, the gas chamber 101 can be inflated by the air source to adjust the pressure inside the gas chamber 101 and maintain the thrust on the push rod 301.

[0057] Connecting the gas chamber 101 to an external air source also has the following beneficial effects: First, the gas chamber 101 can be inflated by the air source to increase the pressure, thereby increasing the clamping force of the gripper 2. Second, by adjusting the pressure of the gas chamber 101, the push rod 301 can be moved into position quickly so that the clamping force of the gripper 2 can quickly reach the preset value.

[0058] In one embodiment, the rivet gun further includes a housing 4, which has a clearance hole 401 through which the air hose connector 10 extends outward. The clearance hole 401 is an elongated hole, allowing the air hose connector 10 to slide axially within the elongated hole along the housing 4. Specifically, the clearance hole 401 can be an oblong hole, a rectangular hole, an elliptical hole, etc.

[0059] In one embodiment, the rivet gun further includes a head assembly 5, which is mounted at the opening of the housing 4. A clamping sleeve 1 and jaws 2 are disposed within the housing 4, with at least a portion of the jaws 2 extending beyond the clamping sleeve 1. The clamping sleeve 1 is axially movable relative to the housing 4. The head assembly 5 is hollow and has a tip 501 facing the jaws 2. The tip 501 abuts against the portion of the jaws 2 extending beyond the clamping sleeve 1 to open the jaws 2. A recess is provided at the end of the jaws 2 facing the head assembly 5. In the initial state, the push rod 301 presses against the jaws 2, causing the jaws 2 to abut against the tip 501 of the head assembly 5. The tip 501 opens the jaws 2, allowing the rivet shank to be inserted into the clamping space of the jaws 2.

[0060] In one embodiment, the rivet gun further includes a transmission mechanism 6. A clamping sleeve 1 is connected to the end of the transmission mechanism 6, which drives the clamping sleeve 1 to move axially. The transmission mechanism 6 may include a lead screw 601 and a lead screw nut 602 sleeved on the outer periphery of the lead screw 601, with the lead screw 601 rotatably connected to the lead screw nut 602. The transmission mechanism 6 can be driven by a drive device. The drive device may include a motor 100 and meshing transmission gears. The lead screw nut 602 is driven to rotate by the drive device, thereby enabling the lead screw 601 to move axially. The clamping sleeve 1 is sleeved on the outer periphery of the end of the lead screw 601. When the lead screw 601 moves from the front end to the rear end, or from the rear end to the front end, it can drive the clamping sleeve 1 to move along with it. The clamping sleeve 1 and the end of the lead screw 601 are connected by a thread, facilitating later disassembly and maintenance. It is worth noting that the drive device is a common device in the prior art, and its specific structure will not be described in detail in this application.

[0061] The lead screw 601 is a hollow tubular structure. A pin-pile tube 302 passes through the lead screw 601, with one end of the pin-pile tube 302 extending outwards from the lead screw 601 away from the top rod 301. A first sealing ring 7 is provided between the outer wall of the pin-pile tube 302 and the inner wall of the lead screw 601, and a second sealing ring 8 is provided between the outer wall of the top rod 301 and the inner wall of the clamping sleeve 1. The end face of the top rod 301 facing the lead screw 601, the wall of the clamping sleeve 1, the wall of the pin-pile tube 302, and the end face of the lead screw 601 facing the top rod 301 together form a gas chamber 101. The first sealing ring 7 and the second sealing ring 8 can seal the gas chamber 101, reducing the possibility of gas leakage.

[0062] In some of the above embodiments, the push rod 301 can be made of the same material as the nail tube. In another embodiment, the push rod 301 can also be made of a flexible material, such as rubber. When the push rod 301 is made of a flexible material, the second sealing ring 8 can be omitted. The push rod 301 fits tightly against the inner wall of the clamping sleeve, providing good sealing. The outer wall of the push rod 301 can also be coated with an oil film or other lubricating film to reduce the friction between the push rod 301 and the inner wall of the clamping sleeve.

[0063] In a further embodiment, the clamping sleeve 1 includes a pushing section 102 and an extension section 103, with the pushing section 102 and the extension section 103 threadedly connected. A pushing surface 1021 is located in the pushing section 102, and the extension section 103 is a straight tube. Specifically, the extension section 103 includes a first end and a second end. The first end has an external thread, and the pushing section 102 has an internal thread; the first end is threadedly connected to the pushing section 102. The second end has an internal thread, and the lead screw 601 has an external thread; the second end is threadedly connected to the lead screw 601. This segmented design facilitates maintenance of the clamping sleeve 1. The end face of the push rod 301 facing the gas chamber 101 moves only within the extension section 103. In some of the above embodiments, the second sealing ring 8 is located between the inner wall of the extension section 103 and the outer wall of the push rod 301.

[0064] In one specific embodiment, the aforementioned vent is located in the extension section 103 of the clamping sleeve 1. The extension section 103, the push rod 301, and the lead screw 601 enclose and form the gas chamber 101. Since the pushing surface 1021 is located in the pushing section 102, its machining is more difficult than that of the straight pipe of the extension section 103. Therefore, when the gas chamber 101 is damaged, only the extension section 103 needs to be replaced, saving machining costs.

[0065] Since the lead screw 601 and the clamping sleeve 1 are detachably connected, air leakage may occur between the lead screw 601 and the clamping sleeve 1. In one embodiment, a third sealing ring 9 may be provided between the outer wall of the lead screw 601 and the inner wall of the clamping sleeve 1, and the third sealing ring 9 is located between the inner wall of the extension section 103 and the outer wall of the lead screw 601.

[0066] The rivet gun of this application is used to seal the electrolyte injection holes of battery cells. During battery cell manufacturing, the cell assembly is first placed inside the battery casing, then the battery cover assembly is fitted onto the battery casing. Electrolyte is then injected into the cavity formed by the battery cover assembly and the battery casing through the electrolyte injection hole on the battery cover assembly. A pop rivet is then inserted into the injection hole, and after riveting, the electrolyte injection hole on the battery cover assembly is sealed. Using the rivet gun of this application provides reliable riveting quality and high riveting efficiency. The electrolyte drawn into the rivet gun during riveting can be collected and discharged promptly, preventing damage to the components inside the rivet gun and improving its service life.

[0067] In some embodiments of this application, rivet gun samples are subjected to rivet removal and fluid drainage tests. The inner diameter of the negative pressure tube 112 of the rivet gun sample and the comparative rivet gun sample in this application is... 1. Inner diameter of liquid storage chamber 111 2. Outer diameter of 302 nail tube 3. The preset distance L between the nail-mounted tube 302 and the negative pressure tube 112 is selected from the data in Table 1. The specifications of other components are the same (not shown in Table 1). The test can be carried out according to the following steps:

[0068] Rivet test: After the rivet gun sample is riveted, the negative pressure generator draws negative pressure on the negative pressure tube 112 at the tail of the rivet gun. The pressure is 0.5 MPa. Observe whether the broken rivet rod can be discharged from the rivet tube 302 through the negative pressure.

[0069] Drainage test: Inject 5 ml of liquid into the reservoir 111 of the above sample rivet gun, then use a negative pressure generator to draw a negative pressure of 0.5 MPa, and observe whether there is any liquid residue in the reservoir 111.

[0070]

[0071] Table 1 compares the test data of the rivet gun sample from one embodiment of this application with those from the comparative example.

[0072] As can be seen from Table 1, the rivet gun samples of some embodiments of this application, such as Embodiments 1 to 26, satisfy 0.8 ≤ ≤11. Under the same negative pressure conditions, after the rivet gun is connected to negative pressure, the broken rivet rod is discharged from the rivet tube 302, and all the liquid in the liquid storage chamber 111 is sucked out, which meets the design requirements.

[0073] As in Examples 27-47, 0.8 ≤ ≤11. The broken nail rod can be discharged, and the liquid in the reservoir 111 can also be discharged, but the following problems exist in the process:

[0074] When the inner diameter of the negative pressure pipe 112 When the pressure is large, under the same gas pressure, the time it takes for the instantaneous pressure difference between the negative pressure pipe 112 and the liquid storage chamber 111 to occur is longer, affecting the electrolyte absorption and resulting in a longer drainage time. When the inner diameter of the negative pressure pipe 112... The 1 is relatively small, the negative pressure tube 112 is relatively thin, the sliding resistance of the nail rod in the negative pressure tube 112 is relatively large, the nailing is not smooth, and the nailing time is relatively long.

[0075] During negative pressure adsorption, a pressure difference is generated between the liquid storage chamber 111 and the negative pressure pipe 112. When the inner diameter of the liquid storage chamber 111... When the pressure difference is large, the pressure difference between the nail-laying pipe 302 and the negative pressure pipe 112 is small, affecting the nail-laying time; when the inner diameter of the liquid storage chamber 111 is large... When the volume of the electrolyte is small, the volume of the storage chamber 111 is small, and the electrolyte is easy to corrode the first seal 1103 outside the pin-pile tube 302 after filling the storage chamber 111.

[0076] When the outer diameter of the nail tube 302 When the outer diameter is large, the pressure difference between the nail-pile tube 302 and the negative pressure tube 112 is small, resulting in a longer electrolyte discharge time. When the outer diameter of the nail-pile tube 302... When the value is smaller, the nail tube 302 is thinner, the nail rod faces greater resistance inside the nail tube 302, and the nailing time is longer.

[0077] When the distance L between the nail-laying tube 302 and the negative pressure tube 112 is large, the pressure difference between them is small, affecting the nail-laying time. When the distance L between the nail-laying tube 302 and the negative pressure tube 112 is small, most of the pressure in the negative pressure tube 112 is transmitted to the nail-laying tube 302, resulting in a longer electrolyte discharge time.

[0078] In comparative examples 1-8, <0.8, under the same air pressure range, the nail rods in the nail-pile tube 302 can be discharged, but the electrolyte forms a dead zone at the corner of the storage chamber 111, making it difficult to discharge.

[0079] In comparative examples 9-14, >11, under the same air pressure range, although the electrolyte in the liquid storage chamber 111 can be discharged, the nail rods in the nail tube 302 cannot be discharged.

[0080] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A rivet gun, characterized in that, It includes a riveting mechanism and an adsorption mechanism, among which, The adsorption mechanism has interconnected liquid storage chambers and negative pressure pipes; The riveting mechanism is used to break the rivet rod. The riveting mechanism includes a rivet tube, which is inserted into the liquid storage cavity. The rivet tube is movable relative to the liquid storage cavity along the axial direction of the rivet tube. The rivet tube is spaced at a preset distance from the negative pressure tube. The adsorption mechanism is used to eject the broken rivet rod from the rivet gun; The inner diameter of the negative pressure pipe 1. The inner diameter of the liquid storage chamber 2. The outer diameter of the nail pack tube is 3. The preset distance L satisfies: .

2. The rivet gun according to claim 1, characterized in that, The inner diameter of the negative pressure pipe 1. Satisfies: 3mm≤ 1≤5mm.

3. The rivet gun according to claim 1, characterized in that, The inner diameter of the liquid storage chamber 2. Satisfies: 10mm ≤ 2≤13mm.

4. The rivet gun according to claim 1, characterized in that, The outer diameter of the nail pack tube is 3. Satisfies: 2mm≤ 3≤6mm.

5. The rivet gun according to claim 1, characterized in that, The preset distance L satisfies: 1mm≤L≤3mm.

6. The rivet gun according to claim 1, characterized in that, The adsorption mechanism includes a body with an opening at one end facing the nail-row tube. The nail-row tube is inserted into the liquid storage chamber through the opening, and a first sealing element is provided between the inner wall of the opening and the outer wall of the nail-row tube.

7. The rivet gun according to claim 1, characterized in that, The adsorption mechanism includes a body and a sealing structure. The body has an opening at one end facing the nail-pile tube, and the sealing structure is installed in the opening. The sealing structure includes a plunger and a first sealing element. The plunger has a through hole, the nail-pile tube passes through the through hole, and the first sealing element is installed between the inner wall of the through hole and the outer wall of the nail-pile tube.

8. The rivet gun according to claim 7, characterized in that, The adsorption mechanism further includes at least one second seal, which is installed between the plunger and the body.

9. The rivet gun according to any one of claims 1 to 8, characterized in that, The inner wall of the liquid storage chamber has a first surface and a second surface that are connected to each other. The first surface is parallel to the nail tube, and the second surface has an angle with the nail tube. The second surface has a first edge and a second edge. The first edge is connected to the negative pressure tube, and the second edge is connected to the first surface. The diameter of the second edge is larger than the diameter of the first edge.

10. The rivet gun according to claim 9, characterized in that, The inner wall of the liquid storage cavity is provided with a liquid storage tank, which is located on the first surface.

11. The rivet gun according to claim 10, characterized in that, The liquid storage tank is inclined toward the negative pressure pipe.

12. The rivet gun according to claim 11, characterized in that, The liquid storage tank includes a first sidewall, a second sidewall, and a bottom wall. The first sidewall and the second sidewall are arranged opposite to each other and are respectively connected to the bottom wall. The first sidewall is connected to the second surface and is in the same plane.

13. The rivet gun according to claim 11, characterized in that, The rivet gun includes multiple liquid storage tanks, which are arranged at intervals along the axial direction of the rivet tube.

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