Gas injection mechanism, nailing device and battery production equipment

Abstract

The utility model provides a gas injection mechanism, a nailing device and battery production equipment, the gas injection mechanism comprises a gas-liquid separation assembly and a negative pressure inflation assembly, and the gas-liquid separation assembly comprises a first interface and a second interface which are communicated with each other. The first interface is communicated with a liquid injection cavity of the battery; and the first interface is positioned below the second interface. And the negative pressure inflating assembly is communicated with the second interface and is used for extracting negative pressure and inflating gas into the liquid injection cavity of the battery. According to the invention, the technical problem of electrolyte loss of the battery in the battery packaging process can be improved, and the structural stability of the battery is improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to an air injection mechanism, a nailing device, and battery production equipment. Background Technology

[0002] During the battery encapsulation process, in order to improve the battery's sealing performance, the gas injection mechanism extracts negative pressure from the battery's liquid injection chamber before nailing and sealing the battery, and then fills the liquid injection chamber with helium. The excellent permeability of helium is used to monitor the battery's airtightness and prevent problems such as electrolyte leakage.

[0003] However, in related technologies, when the gas injection mechanism draws negative pressure from the battery's liquid injection chamber, the electrolyte in the liquid injection chamber is drawn out along with the air, causing the battery's electrolyte to leak out and affecting the battery's structural stability. Utility Model Content

[0004] The embodiments of this utility model provide an injection mechanism, a nailing device, and a battery production equipment, which can improve the technical problem of electrolyte loss during battery packaging and enhance the structural stability of the battery.

[0005] In a first aspect, embodiments of the present invention provide an injection mechanism, comprising:

[0006] A gas-liquid separation assembly includes a first interface and a second interface connected to each other, the first interface being for connecting to the liquid filling chamber of a battery, and the first interface being located below the second interface; and

[0007] The negative pressure inflation component is connected to the second interface and is used to draw negative pressure into the battery's liquid filling chamber and fill it with gas.

[0008] In one embodiment, a separation chamber is formed within the gas-liquid separation assembly, and the first interface and the second interface are respectively connected to the separation chamber.

[0009] In one embodiment, the gas-liquid separation assembly includes:

[0010] A separating member, wherein a separating cavity is formed within the separating member, a first interface communicating with the separating cavity is formed at the bottom of the separating member, and a second interface communicating with the separating cavity is formed at the top of the separating member; and

[0011] A first connector, a portion of which is sealed and connected to the first interface, is detachably connected to the separator, and a liquid channel is formed within the first connector, which communicates with the separator chamber.

[0012] In one embodiment, the gas-liquid separation assembly further includes a second connector, a portion of which is sealed and connected to the second interface. The second connector is detachably connected to the separator, and a gas channel is formed within the second connector, which communicates with the separation chamber.

[0013] In one embodiment, the first interface and the second interface are offset in the thickness direction of the separation cavity.

[0014] In one embodiment, the negative pressure inflation assembly includes:

[0015] The negative pressure component is capable of communicating with the second interface; and

[0016] The inflation component is capable of communicating with the second interface.

[0017] In one embodiment, the gas injection mechanism further includes a three-way valve, which includes a first valve port, a second valve port, and a third valve port that are interconnected.

[0018] The second interface is connected to the first valve port, the negative pressure component is connected to the second valve port, and the inflation component is connected to the third valve port.

[0019] Secondly, embodiments of this utility model provide a nailing device, comprising:

[0020] A nailing mechanism, wherein a nailing channel is formed within the nailing mechanism, the nailing channel being used to connect to the electrolyte filling chamber of the battery; and

[0021] The gas injection mechanism includes a gas-liquid separation component and a negative pressure gas filling component. The gas-liquid separation component includes a first interface and a second interface that are connected to each other. The first interface is used to connect to the liquid filling chamber of the battery and is located below the second interface. The negative pressure gas filling component is connected to the second interface and is used to draw negative pressure into the liquid filling chamber of the battery and fill it with gas.

[0022] The first interface is connected to the battery's liquid injection chamber through the nailing channel.

[0023] In one embodiment, the nailing mechanism includes:

[0024] A nailing tube, wherein the nailing channel is formed inside the nailing tube;

[0025] A push rod, at least a portion of which is movably disposed within the nail-driving channel;

[0026] A first drive assembly, connected to the push rod, is used to drive the push rod to move within the nail-driving channel; and

[0027] A pressure-drawing tube is connected to the nailing tube. A pressure-drawing channel is formed inside the pressure-drawing tube. The pressure-drawing channel is connected to the nailing channel. The first interface is connected to the pressure-drawing channel.

[0028] Thirdly, embodiments of this utility model provide a battery production equipment, including a nailing device, the nailing device comprising:

[0029] A nailing mechanism, wherein a nailing channel is formed within the nailing mechanism, the nailing channel being used to connect to the electrolyte filling chamber of the battery; and

[0030] The gas injection mechanism includes a gas-liquid separation component and a negative pressure gas filling component. The gas-liquid separation component includes a first interface and a second interface that are connected to each other. The first interface is used to connect to the liquid filling chamber of the battery and is located below the second interface. The negative pressure gas filling component is connected to the second interface and is used to draw negative pressure into the liquid filling chamber of the battery and fill it with gas.

[0031] The first interface is connected to the battery's liquid injection chamber through the nailing channel.

[0032] The beneficial effects of the embodiments of this utility model are as follows:

[0033] In this embodiment of the invention, a gas-liquid separation component is provided within the gas injection mechanism. During the negative pressure extraction process of the negative pressure inflation component, the air and electrolyte in the battery's injection chamber are extracted through the gas-liquid separation component. In the gas-liquid separation component, the first interface is located below the second interface. Since the electrolyte is heavier than air, it sinks to the lower layer of the gas-liquid separation component and does not exit from the second interface. Air, being lighter, exits from the second interface during the negative pressure extraction process and is extracted from the upper second interface. After the negative pressure inflation component completes the negative pressure extraction, it injects helium into the battery's injection chamber. The gas enters the gas-liquid separation component through the second interface and carries the electrolyte within the gas-liquid separation component back from the first interface to the battery's injection chamber. In this process, the electrolyte sinks and flows back into the battery's filling chamber due to gravity, and is also carried back into the battery's filling chamber by gas. The gas injection mechanism of this application can reduce the loss of electrolyte in the battery, thereby improving the technical problem of electrolyte loss during battery packaging and enhancing the structural stability of the battery. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a three-dimensional schematic diagram of a battery production equipment provided in an embodiment of this utility model;

[0036] Figure 2 This is another perspective view of the battery production equipment provided in an embodiment of the present invention;

[0037] Figure 3 This is a schematic diagram of a nailing device provided in an embodiment of this utility model;

[0038] Figure 4 This is a schematic diagram of an inflation mechanism provided in an embodiment of the present invention;

[0039] Figure 5 This is a schematic diagram of a gas-liquid separation component provided in an embodiment of the present invention.

[0040] Explanation of reference numerals in the attached figures:

[0041] Battery production equipment 1000; nailing device 100; transfer device 200; clamping device 300; battery 400; processing station PS;

[0042] Injection mechanism 10; Gas-liquid separation component 11; First interface 11a; Second interface 11b; Separation chamber 11c; Thickness direction Z; Separator 111; First connector 112; Liquid channel 112a; Second connector 113; Gas channel 113a; Negative pressure inflation component 12; Negative pressure component 12a; Inflation component 12b; Three-way valve 13; First valve port 13a; Second valve port 13b; Third valve port 13c; Internal valve channel 13d;

[0043] Nail-driving mechanism 20; nail-driving tube 21; nail-driving channel 21a; push rod 22; first drive assembly 23; pressure-drawing tube 24; pressure-drawing channel 24a. Detailed Implementation

[0044] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0045] Please see Figure 1 This application discloses a battery production equipment 1000. The battery production equipment 1000 is used to produce batteries 400, and the battery production equipment 1000 includes a transfer device 200, a clamping device 300, and a nailing device 100.

[0046] The transfer device 200 is used to transport the battery 400 to the processing station PS. The transfer device 200 can be one of a cylinder, a hydraulic cylinder, a robot, or a conveyor belt structure. Taking the transfer device 200 as a cylinder as an example, the cylinder pushes the battery 400 to be processed to the processing station PS.

[0047] The clamping device 300 is used to hold the battery 400 on the processing station PS and to measure the thickness of the battery 400. After the transfer device 200 pushes the battery 400 to be processed onto the processing station PS, the clamping device 300 clamps the battery 400 on the processing station PS. For details, please refer to [link to details]. Figure 2 The clamping device 300 has at least two clamping portions arranged opposite each other in a horizontal direction, which can move closer or further apart. Each clamping portion is connected to a driving member. In this application, the driving member can be an electrode, a cylinder, a hydraulic cylinder, or other structures; details of such driving members will not be elaborated upon hereafter. The driving member is used to drive the clamping portions to move closer or further away from the other clamping portion in a horizontal direction. After the battery 400 to be processed extends to the processing station PS, the two clamping portions clamp the battery 400 to be processed at the processing station PS from both sides. When the battery 400 to be processed is clamped at the processing station PS, the shaking of the battery 400 can be reduced during the negative pressure inflation process, preventing the battery 400 from falling and thus reducing electrolyte leakage during the negative pressure inflation process.

[0048] Optionally, the clamping device 300 also includes a sensor. The sensor can be an infrared sensor, an optical sensor, or a distance sensor; no limitation is made on the sensor used here. The sensor is used to measure the relative distance between the two clamping parts. After the battery 400 to be processed is clamped between the two clamping parts, the sensor can measure the thickness of the battery 400, thereby achieving calibration of the battery 400 thickness.

[0049] The nailing device 100 is used to process the battery 400 on the processing station PS. The nailing device 100 can be mounted on a slide rail, and the nailing device 100 is driven to move by a drive component so that the nailing device 100 is positioned to correspond to the battery 400 on the processing station PS.

[0050] Please see Figure 3 This application proposes a nailing device 100, which includes a nailing mechanism 20 and an air injection mechanism 10.

[0051] In the process of processing the battery 400 on the processing station PS, the gas injection mechanism 10 first draws negative pressure from the battery 400 to remove the air from the liquid injection chamber of the battery 400. Then, the gas injection mechanism 10 injects helium into the liquid injection chamber of the battery 400. After the gas injection is completed, the nailing mechanism 20 drives the sealing nails that are already present on the battery 400 but not fully driven in into the battery 400, thereby sealing the battery 400.

[0052] The purpose of the gas injection mechanism 10, which first draws air under negative pressure and then fills in helium, is to enhance the sealing performance of the battery 400. When injecting helium into the electrolyte filling chamber of the battery 400, the excellent permeability of helium allows for the testing of the battery 400's airtightness, preventing subsequent electrolyte leakage and other problems, thus improving the product quality of the battery 400. Good airtightness and structural stability also reduce performance degradation during use, thereby improving the overall quality and lifespan of the battery 400.

[0053] In this embodiment, there will be sealing nails on the battery 400 to be processed, but the sealing nails are not completely driven into the battery 400. They need to be driven into the battery 400 by the nailing mechanism 20 after the gas injection mechanism 10 has completed the gas injection.

[0054] In other embodiments, a sealing pin may be provided in the nailing mechanism 20. After the gas injection mechanism 10 completes the gas injection, the sealing pin in the nailing mechanism 20 is pushed out by the nailing mechanism 20 and nailed onto the battery 400, thereby sealing the battery 400. There is no limitation on whether a sealing pin is stored in the nailing mechanism 20.

[0055] Please see Figure 3 This application proposes an air injection mechanism 10, which includes an air-liquid separation component 11 and a negative pressure air filling component 12b12.

[0056] The gas-liquid separation assembly 11 includes a first interface 11a and a second interface 11b that are connected to each other. The first interface 11a is used to connect to the liquid filling chamber of the battery 400. The first interface 11a is located below the second interface 11b.

[0057] The negative pressure inflation assembly 12b12 is connected to the second interface 11b and is used to draw negative pressure into the liquid injection chamber of the battery 400 and fill it with gas.

[0058] In this embodiment, by providing a gas-liquid separation component 11 within the gas injection mechanism 10, during the negative pressure extraction process of the negative pressure inflation component 12b12, the air and electrolyte in the injection chamber of the battery 400 pass through the gas-liquid separation component 11 when being extracted. In the gas-liquid separation component 11, the first interface 11a is located below the second interface 11b. Since the electrolyte is heavier than air, it sinks to the lower layer of the gas-liquid separation component 11 and will not be discharged from the second interface 11b. Air, being lighter, is discharged from the second interface 11b during the negative pressure extraction process and is extracted from the upper second interface 11b. After the negative pressure inflation assembly 12b12 completes the extraction of negative pressure, it fills the liquid injection chamber of the battery 400 with helium gas. The gas enters the gas-liquid separation assembly 11 through the second port 11b and carries the electrolyte located in the gas-liquid separation assembly 11 back to the liquid injection chamber of the battery 400 from the first port 11a. In this process, the electrolyte sinks and flows back to the liquid injection chamber of the battery 400 due to gravity, and is also carried back to the liquid injection chamber of the battery 400 by the gas. The inflation mechanism 10 of this application can reduce the loss of electrolyte in the battery 400, thereby improving the technical problem of electrolyte loss in the battery 400 during the encapsulation process and improving the structural stability of the battery 400.

[0059] It's understandable that electrolyte being heavier than air means the electrolyte's density is greater than that of air. For example, the electrolyte density of a common lithium-ion battery (400) is generally around 1.1 grams per cubic meter. The density of air under standard conditions (0 degrees Celsius, 101325 Pa) is approximately 1.29 kilograms per cubic meter. Converting the density of air under standard conditions, we get approximately 0.00129 grams per cubic meter. Comparing the density of a common lithium-ion battery (400) electrolyte to the density of air under standard conditions, we can see that the density of the electrolyte in a common lithium-ion battery (400) is 1000 times that of air. The electrolyte's density is far greater than that of air; therefore, electrolyte is heavier than air.

[0060] On the other hand, electrolytes are generally liquids with a definite volume and mass. Under the influence of gravity, their mass is distributed at the bottom of the container or distributed throughout the container according to certain physical laws. Air, under standard conditions, is a gas, filling the space. Its density is relatively low and changes due to factors such as air pressure and temperature. Because air is less dense, the mass of an electrolyte of the same volume is much greater than that of air, which demonstrates that electrolytes are heavier than air.

[0061] In this embodiment, the process of first drawing a negative pressure and then filling with helium is a manifestation of pressure equalization technology. Pressure equalization technology, through precise pressure control, ensures a tight seal within the battery 400, improving the overall structural stability of the battery 400. Taking the drawing of a 60 kPa negative pressure followed by the filling with 30 kPa helium as an example, this process, on the one hand, ensures a tight seal within the battery 400, reducing battery 400 failure due to poor connections; on the other hand, the helium gas can be used to test the airtightness of the battery 400, reducing the risk of electrolyte leakage.

[0062] In this embodiment, the negative pressure inflation component 12b12 does not continuously draw negative pressure from the electrolyte filling chamber of the battery 400, but rather draws a certain amount of negative pressure, for example, 60 kPa, before filling the electrolyte filling chamber of the battery 400 with helium. The 60 kPa negative pressure causes the electrolyte that is drawn out along with the air to settle at the bottom of the gas-liquid separation component 11, and the helium can be carried back into the electrolyte filling chamber of the battery 400 by the helium.

[0063] Optionally, the gas-liquid separation component 11 can be directly connected to the liquid filling chamber of the battery 400 via a conduit, air pipe, etc.

[0064] Optionally, the gas-liquid separation component 11 can also be connected to the nailing mechanism 20 first, and then indirectly connected to the liquid filling chamber of the battery 400 through the nailing mechanism 20. In this embodiment, a nailing channel 21a is formed in the nailing mechanism 20, and the first interface 11a of the gas-liquid separation component 11 in the gas injection mechanism 10 is connected to the liquid filling chamber of the battery 400 through the nailing channel 21a.

[0065] Specifically, after the inflation mechanism draws negative pressure and fills the electrolyte filling chamber of the battery 400 with helium through the nailing channel 21a, the nailing mechanism 20 drives the sealing nail into the battery 400 through the nailing channel 21a, thus completing the sealing of the battery 400. In this embodiment, the battery 400 only needs to be provided with one interface connecting to the electrolyte filling chamber to realize functions such as evacuation, inflation, and sealing. Without affecting the production efficiency of the battery 400, the number of interfaces on the surface of the battery 400 is reduced, thereby reducing the risk of electrolyte leakage and improving the service life and structural stability of the battery 400.

[0066] Optionally, the nailing mechanism 20 includes a nailing tube 21, a push rod 22, a first drive assembly 23, and a pressure-drawing tube 24. A nailing channel 21a is formed inside the nailing tube 21. At least a portion of the push rod 22 is movably disposed within the nailing channel 21a. The first drive assembly 23 is connected to the push rod 22 and is used to drive the push rod 22 to move within the nailing channel 21a. The pressure-drawing tube 24 is connected to the nailing tube 21. A pressure-drawing channel 24a is formed inside the pressure-drawing tube 24. The pressure-drawing channel 24a communicates with the nailing channel 21a. A first interface 11a communicates with the pressure-drawing channel 24a.

[0067] In this embodiment, the first interface 11a and the suction channel 24a can be connected through a conduit, trachea or other structure.

[0068] During the negative pressure extraction and inflation phase, a portion of the drive rod 22 extends from the nailing channel 21a, connecting the pressure extraction channel 24a with the nailing channel 21a. The inflation mechanism then uses the pressure extraction channel 24a and the nailing channel 21a to extract negative pressure and inflate the electrolyte filling chamber of the battery 400. The pressure extraction tube 24 improves the airtightness of the connection between the nailing mechanism 20 and the inflation mechanism. The first drive assembly 23 can be an electrode, a cylinder, a hydraulic cylinder, or other similar structures.

[0069] During the nailing and sealing stage, the first drive assembly 23 drives a portion of the push rod 22 to extend into the nailing channel 21a and drive the sealing nail into the battery 400 to achieve the sealing of the battery 400.

[0070] Please see Figure 4 Optionally, the negative pressure inflation assembly 12b12 includes a negative pressure assembly 12a and an inflation assembly 12b.

[0071] In this embodiment, the negative pressure component 12a is used to draw negative pressure into the liquid injection chamber of the battery 400. The negative pressure component 12a can be a vacuum pump, a negative pressure filter, a negative pressure fan, an air pump, or other similar equipment. The vacuum pump can be a rotary vane vacuum pump, a water ring vacuum pump, or a reciprocating vacuum pump. When the negative pressure fan starts, the electrodes drive the fan blades to rotate, thereby generating negative pressure and drawing air from the liquid injection chamber of the battery 400 into the fan. This air is accelerated by the fan blades and then discharged from the outlet. In this embodiment, the negative pressure component 12a draws a certain amount of negative pressure from the liquid injection chamber of the battery 400 according to the size of the battery 400. This embodiment uses a negative pressure of 60 kPa as an example for explanation, but does not limit the value of the negative pressure drawn by the negative pressure component 12a. The specific value of the negative pressure drawn depends on the capacity of the liquid injection chamber and the capacity of the gas-liquid separation component 11.

[0072] The inflation assembly 12b is used to inject gas into the liquid filling chamber of the battery 400. The inflation assembly 12b can be an inflation machine, an inflation pump, or other similar device. The inflation machine can be an air column type inflation machine, an air cushion machine, a wall-mounted inflation machine, a column-type automatic inflation machine, or other similar devices. The inflation pump can be a compressed gas inflation pump or a handheld inflation pump, etc., and no limitation is made to the inflation assembly 12b here.

[0073] Optionally, the negative pressure component 12a can be connected to the second interface 11b. The inflation component 12b can be connected to the second interface 11b. In this embodiment, the negative pressure component 12a and the inflation component 12b can be connected to the second interface 11b respectively. That is, during the negative pressure extraction process, the negative pressure component 12a is connected to the second interface 11b, and the inflation component 12b is disconnected from the second interface 11b. A driving device can be used to connect the negative pressure component 12a and the second interface 11b, or the operator can manually connect the negative pressure component 12a and the second interface 11b; no limitation is made here. Before inflation after completing the negative pressure extraction, the negative pressure component 12a is disconnected from the second interface 11b, and the inflation component 12b is connected to the second interface 11b. The inflation component 12b injects helium into the liquid injection chamber of the battery 400. In this embodiment, a negative pressure of 60 kPa can be first extracted from the liquid filling chamber of the battery 400 using the negative pressure assembly 12a, and then helium gas of 30 kPa can be injected into the liquid filling chamber of the battery 400 using the gas filling assembly 12b. No limitation is made on the pressure of the extracted and injected gases; the above values ​​are merely examples. The negative pressure assembly 12a and the gas filling assembly 12b can be connected to the second interface 11b via a tracheal tube, conduit, or the like.

[0074] Optionally, the air injection mechanism 10 also includes a three-way valve 13. The three-way valve 13 includes a first valve port 13a, a second valve port 13b, and a third valve port 13c that are interconnected. Specifically, the second port 11b is connected to the first valve port 13a, the negative pressure component 12a is connected to the second valve port 13b, and the air injection component 12b is connected to the third valve port 13c.

[0075] In this embodiment, to reduce the steps and time required for switching between the negative pressure component 12a and the inflation component 12b, a three-way valve 13 is provided between the negative pressure inflation component 12b12 and the gas-liquid separation component 11. The three-way valve 13 includes a first valve port 13a, a second valve port 13b, and a third valve port 13c that are interconnected. Specifically, an internal channel 13d is formed inside the three-way valve 13. The internal channel 13d is connected to the first valve port 13a, the second valve port 13b, and the third valve port 13c, respectively.

[0076] During the negative pressure extraction process, since the first valve port 13a is connected to the second valve port 13b, the negative pressure component 12a can be connected to the second interface 11b, thereby drawing the gas and electrolyte in the liquid injection chamber of the battery 400 into the gas-liquid separation component 11. There is no need to automatically or manually switch the connection between the negative pressure component 12a and the second interface 11b, which reduces the time required to switch the connection between the negative pressure component 12a and the second interface 11b and improves production efficiency.

[0077] During the inflation process, since the first valve port 13a is connected to the third valve port 13c, the inflation component 12b can be connected to the second interface 11b, thereby filling the helium in the inflation component 12b into the gas-liquid separation component 11. The helium carries the electrolyte deposited in the gas-liquid separation component back to the liquid injection chamber of the battery 400, reducing the time required to switch the connection between the inflation component 12b and the second interface 11b and improving production efficiency.

[0078] Optionally, a separation chamber 11c is formed within the gas-liquid separation assembly 11, and the first interface 11a and the second interface 11b are respectively connected to the separation chamber 11c.

[0079] In this embodiment, the separation chamber 11c is configured to separate the air and electrolyte drawn into the gas-liquid separation assembly 11. The volume of the separation chamber 11c is related to the negative pressure drawn by the negative pressure assembly 12a. When the negative pressure assembly 12a draws in more air, the volume of the separation chamber 11c is relatively large to prevent excessive electrolyte from overflowing from the second interface 11b after being drawn into the separation chamber 11c, thus preventing electrolyte leakage. When the negative pressure assembly 12a draws in less air, the volume of the separation chamber 11c is relatively small. During the subsequent inflation stage, all the electrolyte inside the small-volume separation chamber 11c can flow back into the battery 400, improving the stability of the battery 400 structure.

[0080] During the negative pressure extraction process of the negative pressure assembly 12a, air and electrolyte in the electrolyte injection chamber of the battery 400 are drawn into the separation chamber 11c. In the separation chamber 11c, the denser electrolyte settles, while the less dense air rises and is extracted from the second port 11b. Since the second port 11b is located at the top, the gas is extracted from the second port 11b, and the denser electrolyte settles in the separation chamber 11c, thus separating from the gas.

[0081] During the inflation process of the inflation assembly 12b, the electrolyte is deposited in the lower layer of the separation chamber 11c. On one hand, helium gas entering the separation chamber 11c from above through the second interface 11b pushes the electrolyte, squeezing it into the injection chamber of the battery 400. On the other hand, the electrolyte itself is affected by gravity, which also accelerates the return flow of the electrolyte, thereby ensuring that all the electrolyte in the separation chamber 11c can return to the injection chamber of the battery 400, reducing electrolyte leakage.

[0082] Optionally, the gas-liquid separation assembly 11 includes a separator 111 and a first connector 112.

[0083] A separation cavity 11c is formed inside the separator 111. A first interface 11a communicating with the separation cavity 11c is formed at the bottom of the separator 111. A second interface 11b communicating with the separation cavity 11c is formed at the top of the separator 111.

[0084] A portion of the first connector 112 is sealed and connected to the first interface 11a. The first connector 112 is detachably connected to the separator 111. A liquid channel 112a is formed inside the first connector 112, and the liquid channel 112a communicates with the separation chamber 11c.

[0085] In this embodiment, since the first interface 11a is formed at the bottom of the separation cavity 11c and the second interface 11b is formed at the top of the separation cavity 11c, all the electrolyte in the separation cavity 11c can flow back to the liquid injection cavity of the battery 400 after inflation, thereby reducing the amount of electrolyte remaining in the separation cavity 11c.

[0086] The first connector 112 is sealed to the separator 111, which improves the airtightness of the first interface 11a connection and prevents electrolyte leakage during negative pressure extraction and inflation. The first connector 112 and separator 111 are detachably connected because the electrolyte is corrosive; after prolonged use, the connection point of the first connector 112 will corrode, requiring disassembly and replacement to ensure the airtightness of the inflation mechanism and reduce the possibility of electrolyte leakage. The first connector 112 and separator 111 can be detachably connected via an elastic interference fit, or via a threaded connection or pin connection; the method of detachable connection is not limited here.

[0087] Optionally, the gas-liquid separation assembly 11 further includes a second connector 113, a portion of which is sealed and connected to the second interface 11b. The second connector 113 is detachably connected to the separator 111, and a gas channel 113a is formed within the second connector 113, which communicates with the separation chamber 11c.

[0088] In this embodiment, the second connector 113 is sealed to the separator 111. During the negative pressure extraction process, the pressure inside the electrolyte filling chamber of the battery 400 can be precisely controlled, achieving a tight fit inside the battery 400. During the inflation process, helium leakage can be avoided, preventing environmental pollution. After prolonged use, the second connector 113 may age, leading to a decrease in its airtightness. In this case, the airtightness of the inflation mechanism can be ensured by disassembling and replacing the second connector 113, reducing the possibility of electrolyte leakage. The second connector 113 and the separator 111 can be detachably connected via an elastic interference fit, or they can be connected by threads or pins; the method of detachable connection is not limited here.

[0089] Please see Figure 5 Optionally, the first interface 11a and the second interface 11b are offset in the thickness direction Z of the separation cavity 11c.

[0090] In this embodiment, by staggering the first interface 11a and the second interface 11b, a better gas-liquid separation effect can be achieved within the separation chamber 11c. This is because the first connector 112, being in contact with the electrolyte, typically has good liquid corrosion resistance. The second connector 113, however, only contacts helium, an inert gas that is not corrosive. Therefore, the second connector 113 generally does not need to have liquid corrosion resistance; compared to the first connector 112, the second connector 113 only needs to consider airtightness, and its production cost and replacement frequency are lower than that of the first connector.

[0091] However, during the negative pressure extraction process, if the second port 11b is directly above the first port 11a, after the electrolyte and gas enter the separation chamber 11c from the first port 11a, a small portion of the electrolyte will splash upwards onto the second connector 113, causing corrosion. Since the second connector 113 does not have liquid corrosion resistance, this will accelerate the corrosion of the second connector 113. Corrosion of the second connector 113 will reduce its airtightness and affect the normal operation of the inflation mechanism.

[0092] Therefore, by misaligning the first interface 11a and the second interface 11b, this embodiment ensures that even if the electrolyte entering the separation chamber 11c splashes upwards, it will not directly splash onto the second connector 113, but rather onto the inner wall of the separation chamber 11c. This reduces the corrosion of the second connector 113, extends its service life, and improves the airtightness of the inflation mechanism.

[0093] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A gas injection mechanism, characterized in that, include: A gas-liquid separation assembly includes a first interface and a second interface that are connected to each other. The first interface is used to connect to the liquid filling chamber of a battery, and the first interface is located below the second interface. as well as The negative pressure inflation component is connected to the second interface and is used to draw negative pressure into the battery's liquid filling chamber and fill it with gas.

2. The gas injection mechanism according to claim 1, characterized in that, The gas-liquid separation component has a separation chamber, and the first interface and the second interface are respectively connected to the separation chamber.

3. The gas injection mechanism according to claim 2, characterized in that, The gas-liquid separation component includes: A separating member, wherein a separating cavity is formed within the separating member, a first interface communicating with the separating cavity is formed at the bottom of the separating member, and a second interface communicating with the separating cavity is formed at the top of the separating member; and A first connector, a portion of which is sealed and connected to the first interface, is detachably connected to the separator, and a liquid channel is formed within the first connector, which communicates with the separator chamber.

4. The gas injection mechanism according to claim 3, characterized in that, The gas-liquid separation assembly further includes a second connector, a portion of which is sealed and connected to the second interface. The second connector is detachably connected to the separation component, and a gas channel is formed within the second connector, which communicates with the separation chamber.

5. The gas injection mechanism according to claim 2, characterized in that, The first interface and the second interface are offset in the thickness direction of the separation cavity.

6. The gas injection mechanism according to any one of claims 1-5, characterized in that, The negative pressure inflation assembly includes: The negative pressure component is capable of communicating with the second interface; and The inflation component is capable of communicating with the second interface.

7. The gas injection mechanism according to claim 6, characterized in that, The gas injection mechanism also includes a three-way valve, which includes a first valve port, a second valve port, and a third valve port that are interconnected with each other. The second interface is connected to the first valve port, the negative pressure component is connected to the second valve port, and the inflation component is connected to the third valve port.

8. A nail-driving device, characterized in that, include: A nailing mechanism, wherein a nailing channel is formed within the nailing mechanism, and the nailing channel is used to connect to the liquid injection chamber of the battery; as well as The gas injection mechanism as described in any one of claims 1-7; The first interface is connected to the battery's liquid injection chamber through the nailing channel.

9. The nailing device as described in claim 8, characterized in that, The nailing mechanism includes: A nailing tube, wherein the nailing channel is formed inside the nailing tube; A push rod, at least a portion of which is movably disposed within the nail-driving channel; A first drive assembly, connected to the push rod, is used to drive the push rod to move within the nail-driving channel; and A pressure-drawing tube is connected to the nailing tube. A pressure-drawing channel is formed inside the pressure-drawing tube. The pressure-drawing channel is connected to the nailing channel. The first interface is connected to the pressure-drawing channel.

10. A battery manufacturing apparatus, characterized in that, Including the nailing device as described in any one of claims 8-9.

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