A negative pressure formation system

Abstract

The present application discloses a negative pressure formation system, which includes a positioning mechanism, an adsorption mechanism, a low negative pressure mechanism and a high negative pressure mechanism. The positioning mechanism includes a fixed plate and a positioning block connected to the opposite ends of the fixed plate, and the positioning block is used to position a single cell; the adsorption mechanism is used to communicate with the injection hole of the single cell; the low negative pressure mechanism is connected to the adsorption mechanism, and the low negative pressure mechanism is used to evacuate the single cell through the adsorption mechanism when the single cell is formed and the exhaust is high-speed; the high negative pressure mechanism is connected to the adsorption mechanism, and the high negative pressure mechanism is used to evacuate the single cell through the adsorption mechanism when the single cell is formed and the exhaust is low-speed. The negative pressure formation system of the present application can prevent the single cell from moving during the formation process, and aims to provide a negative pressure formation system with low energy loss, small battery electrolyte loss, and flexible use.

Description

Technical Field

[0001] The present application relates to the technical field of negative pressure formation systems, and in particular to a negative pressure formation system. Background Art

[0002] Today's lithium battery formation process is generally carried out in a high temperature and low dew point environment. During the formation process, as the internal reaction of the battery proceeds, a corresponding degree of gas will be generated. If the gas cannot be discharged in time, the accumulation of gas will cause the battery shell to swell, the formation to be poor, or even scrapped, which poses a great potential risk.

[0003] Most of the existing negative pressure formation technologies are single-channel negative pressure formation. A single high-negative pressure exhaust mode is used for rapid exhaust during the battery formation stage. In the high-negative pressure mode, the electrolyte inside the battery overflows with the mist, causing electrolyte loss and contamination of the surface of the injection port. The single-channel negative pressure formation mode is single, and when the process changes and has different requirements for negative pressure, the negative pressure valve needs to be manually adjusted, which lacks flexibility and convenience.

[0004] Application Contents

[0005] The purpose of this application is to provide a negative pressure formation system to solve the technical problem of exhaust during lithium battery formation.

[0006] To achieve the above purpose, the present application adopts the following technical solution: a negative pressure formation system is provided, the negative pressure formation system comprising:

[0007] The positioning mechanism comprises a fixing plate and positioning blocks connected to opposite ends of the fixing plate, the positioning blocks being used to position the single battery;

[0008] An adsorption mechanism, used to communicate with the liquid injection hole of the single battery;

[0009] A low negative pressure mechanism is connected to the adsorption mechanism, and is used to evacuate the single cell through the adsorption mechanism when the single cell is formed into a high-speed exhaust gas;

[0010] The high negative pressure mechanism is connected with the adsorption mechanism and is used for exhausting the single cell through the adsorption mechanism when the single cell is formed into low-speed exhaust.

[0011] Furthermore, the positioning block is provided with a fixing groove, which is used to position the single battery; the positioning block is provided with a guide opening corresponding to the fixing groove, which is trumpet-shaped to facilitate the single battery to enter the fixing groove.

[0012] Furthermore, the negative pressure formation system further comprises a temperature probe connected to the fixing plate, the temperature probe being used to detect the temperature of the single battery; and / or

[0013] The negative pressure formation system also includes a probe connected to the fixing plate, and the probe is used to be electrically connected to the electrode of the single cell.

[0014] Furthermore, the adsorption mechanism includes a suction nozzle and a buffer cup, the suction nozzle is used to communicate with the injection hole, one end of the buffer cup is connected to the suction nozzle, and the opposite end of the buffer cup is respectively connected to the low negative pressure mechanism and the high negative pressure mechanism.

[0015] Furthermore, the suction nozzle includes a main body, a first sealing part and a second sealing part. The main body is provided with a channel for communicating with the injection hole, and the channel is connected to the buffer cup. The first sealing part and the second sealing part are respectively connected to the main body and are spaced apart from each other to surround the channel. The first sealing part is used to abut the inner wall of the injection hole, and the second sealing part is used to abut the top cover of the single cell.

[0016] Furthermore, the adsorption mechanism also includes a gas-liquid separator and a micro-mist separator. The buffer cup, the gas-liquid separator and the micro-mist separator are connected in sequence. The buffer cup is connected to the low negative pressure mechanism and the high negative pressure mechanism respectively through the micro-mist separator.

[0017] Furthermore, the low negative pressure mechanism includes a low negative pressure source, a first pressure regulating valve, a first vacuum valve, an air source, a first solenoid valve and a first cylinder; the low negative pressure source, the first pressure regulating valve, the first vacuum valve and the adsorption mechanism are connected in sequence; the air source, the first solenoid valve and the first cylinder are connected in sequence; and the output end of the first cylinder is connected to the first vacuum valve; wherein, when the first solenoid valve is energized, air in the air source enters the first cylinder so that the first cylinder opens the first vacuum valve; when the first vacuum valve is open, the low negative pressure source draws air through the adsorption mechanism.

[0018] Furthermore, the high negative pressure mechanism includes a high negative pressure source, a second pressure regulating valve, a second vacuum valve, an air source, a second solenoid valve and a second cylinder. The high negative pressure source, the second pressure regulating valve, the second vacuum valve and the adsorption mechanism are connected in sequence. The air source, the second solenoid valve and the second cylinder are connected in sequence. The output end of the second cylinder is connected to the second vacuum valve. When the second solenoid valve is energized, the air in the air source enters the second cylinder so that the second cylinder opens the first vacuum valve. When the second vacuum valve is open, the high negative pressure source draws air through the adsorption mechanism.

[0019] Furthermore, the negative pressure formation system also includes a vacuum breaking mechanism connected to the adsorption mechanism, and the vacuum breaking mechanism is used to balance the internal and external air pressures of the adsorption mechanism.

[0020] Furthermore, the vacuum breaking mechanism includes a dry gas source, a filter, a third vacuum valve, an air source, a third solenoid valve and a third cylinder. The dry gas source, the filter, the third vacuum valve and the adsorption mechanism are connected in sequence. The air source, the third solenoid valve and the third cylinder are connected in sequence. The output end of the third cylinder is connected to the third vacuum valve. When the third solenoid valve is energized, the air in the air source enters the third cylinder so that the third cylinder opens the third vacuum valve. When the third vacuum valve is in an open state, the gas in the dry gas source enters the single cell to balance the internal and external air pressures of the adsorption mechanism.

[0021] The beneficial effects of the embodiments of the present application are:

[0022] The negative pressure formation system of the present application includes a positioning mechanism, an adsorption mechanism, a low negative pressure mechanism and a high negative pressure mechanism.

[0023] The positioning mechanism includes a fixing plate and positioning blocks connected to opposite ends of the fixing plate, and the positioning blocks are used to position the single battery. The two positioning blocks are respectively connected to opposite ends of the single battery, thereby limiting and fixing the single battery to prevent the battery from being unable to align with the adsorption mechanism after being moved.

[0024] The low negative pressure mechanism and the high negative pressure mechanism adjust the exhaust speed of the single cell according to the speed of gas production during formation of the single cell. In the early stage of formation, the low negative pressure mechanism exhausts the single cell to prevent the gas produced by the single cell from being quickly exhausted. By lowering the negative pressure, the pressure difference between the pressure inside the bubble and the pressure formed by the external negative pressure is lowered, and the volume of the bubble will be reduced. When the reduced bubble is sucked and discharged to the injection hole through the adsorption mechanism, it will not push out the electrolyte and pollute the injection hole; in the late stage of formation, the high negative pressure mechanism extracts the remaining gas in the single cell. Since the gas production speed of the single cell slows down at this time, the use of the high negative pressure mechanism to exhaust can improve work efficiency without polluting the injection hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments or preliminary research and development of the present application, the drawings required for use in the embodiments or preliminary research and development descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0026] Figure 1 It is a structural schematic diagram of the negative pressure formation system provided by the present application;

[0027] Figure 2 It is a schematic diagram of the structure of the negative pressure formation system provided by the present application in the single cell area;

[0028] Figure 3It is a structural schematic diagram of the positioning block provided by this application;

[0029] Figure 4 It is a structural schematic diagram of the adsorption mechanism provided by the present application;

[0030] Figure 5 It is a structural schematic diagram of the suction nozzle provided in this application.

[0031] The graphic markings are as follows:

[0032] Negative pressure formation system 100 positioning mechanism 10 fixing plate 12 positioning block 14

[0033] Fixing groove 16 Guide port 18 Adsorption mechanism 20 Suction nozzle 22

[0034] Buffer cup 24 Gas-liquid separator 26 Micro-mist separator 28 Main body 221

[0035] First sealing part 223 Second sealing part 225 Channel 227 Low negative pressure mechanism 30

[0036] Low negative pressure source 31 First pressure regulating valve 32 First vacuum valve 33 Air source 80

[0037] First solenoid valve 35 First cylinder 36 High negative pressure mechanism 40 High negative pressure source 41

[0038] Second pressure regulating valve 42 Second vacuum valve 43 Air source 80 Second solenoid valve 45

[0039] Second cylinder 46 Temperature probe 50 Probe 60 Vacuum breaking mechanism 70

[0040] Dry gas source 71 Filter 72 Third vacuum valve 73 Air source 80

[0041] Third solenoid valve 75 Third cylinder 76 Single battery 200 Liquid injection hole 201 DETAILED DESCRIPTION

[0042] The descriptions involving “first”, “second”, etc. in this application are only for descriptive purposes and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features.

[0043] See also Figure 1 and Figure 2 , Figure 1 is a schematic structural diagram of a negative pressure formation system 100 provided in the present application, Figure 2 It is a schematic structural diagram of the negative pressure formation system 100 provided in the present application in the area of ​​the single battery 200.

[0044] The negative pressure formation system 100 of the present application includes a positioning mechanism 10 , an adsorption mechanism 20 , a low negative pressure mechanism 30 and a high negative pressure mechanism 40 .

[0045] The positioning mechanism 10 includes a fixing plate 12 and positioning blocks 14 connected to opposite ends of the fixing plate 12, and the positioning blocks 14 are used to position the single battery 200. The two positioning blocks 14 are respectively connected to opposite ends of the single battery 200, so as to limit and fix the single battery 200 to prevent the battery from being unable to align with the adsorption mechanism 20 after being moved. In addition, the two positioning blocks 14 can move relative to each other to adjust the distance between each other, so as to be used to limit and fix single batteries 200 of different sizes.

[0046] The adsorption mechanism 20 is used to adsorb the single battery 200 and is connected to the liquid injection hole 201 of the single battery 200 .

[0047] The low negative pressure mechanism 30 is connected to the adsorption mechanism 20, and is used to evacuate the single cell 200 through the adsorption mechanism 20 when the single cell 200 is formed and exhausts gas at high speed. The single cell 200 is formed and exhausts gas at high speed at the beginning of formation, and the single cell 200 will gradually reach the gas production peak over time.

[0048] The high negative pressure mechanism 40 is connected to the adsorption mechanism 20, and is used to exhaust gas from the single cell 200 through the adsorption mechanism 20 when the single cell 200 is formed and exhausts gas at a low speed. The low-speed exhaust stage of the single cell 200 is the late stage of formation, and the single cell 200 gradually reduces the gas production speed from the gas production peak over time. The air suction speed of the low negative pressure mechanism 30 is less than the air suction speed of the high negative pressure mechanism 40.

[0049] The low negative pressure mechanism 30 and the high negative pressure mechanism 40 adjust the exhaust speed of the single cell 200 according to the speed of gas production of the single cell 200. In the early stage of formation, the low negative pressure mechanism 30 exhausts the single cell 200 to prevent the gas produced by the single cell 200 from being quickly exhausted. Since the negative pressure is lowered, the pressure difference between the pressure inside the bubble and the pressure formed by the external negative pressure is lowered, and the volume of the bubble will be reduced. When the reduced bubble is sucked by the adsorption mechanism 20 and discharged to the injection hole 201, it will not push out the electrolyte and pollute the injection hole 201; in the late stage of formation, the high negative pressure mechanism 40 extracts the remaining gas in the single cell 200. Since the gas production speed of the single cell 200 slows down at this time, the use of the high negative pressure mechanism 40 to exhaust can improve the work efficiency without causing the injection hole 201 to be polluted.

[0050] See also Figure 2 and Figure 3 , Figure 3 It is a structural schematic diagram of the positioning block 14 provided in this application.

[0051] The positioning block 14 is provided with a fixing groove 16 . The shape of the fixing groove 16 is the same as or similar to the shape of the single battery 200 . The end of the single battery 200 is inserted into the fixing groove 16 , so as to position the single battery 200 .

[0052] The positioning block 14 is provided with a guide opening 18 corresponding to the fixing groove 16 . The guide opening 18 is in a trumpet shape to facilitate the single battery 200 to enter the fixing groove 16 .

[0053] See also Figure 2 The negative pressure formation system 100 further includes a temperature probe 50 connected to the fixing plate 12 , and the temperature probe 50 is used to detect the temperature of the single battery 200 to obtain temperature change data of the single battery 200 during the formation process.

[0054] The negative pressure formation system 100 further includes a probe 60 connected to the fixing plate 12 . The probe 60 is used to be electrically connected to the electrodes of the single battery 200 , so that the single battery 200 is electrically conductive during the formation process.

[0055] See also Figure 4 and Figure 5 , Figure 4 is a schematic diagram of the structure of the adsorption mechanism 20 provided in the present application, Figure 5 It is a schematic diagram of the structure of the suction nozzle 22 provided in the present application.

[0056] The adsorption mechanism 20 includes a suction nozzle 22 and a buffer cup 24. The suction nozzle 22 is used to communicate with the liquid injection hole 201. One end of the buffer cup 24 is connected to the suction nozzle 22, and the opposite end of the buffer cup 24 is respectively connected to the low negative pressure mechanism 30 and the high negative pressure mechanism 40. The buffer cup 24 is used to buffer the liquid sucked out from the single battery 200 through the suction nozzle 22 to prevent the liquid from flowing back into the low negative pressure mechanism 30 and the high negative pressure mechanism 40 to cause pollution. When the low negative pressure mechanism 30 and the high negative pressure mechanism 40 stop working respectively, the liquid in the buffer cup 24 can flow back to the single battery 200 by gravity to reduce the replenishment of the liquid in the single battery 200.

[0057] The nozzle 22 includes a main body 221, a first sealing part 223 and a second sealing part 225. The main body 221 is provided with a channel 227 for communicating with the injection hole 201. The channel 227 is communicated with the buffer cup 24. The first sealing part 223 and the second sealing part 225 are respectively connected to the main body 221 and are spaced apart from each other to surround the channel 227. The first sealing part 223 is used to abut against the inner wall of the injection hole 201 to form a first seal. The second sealing part 225 is used to abut against the top cover of the single cell 200 to form a second seal. The first seal and the second seal cooperate with each other to improve the sealing performance of the nozzle 22 to the injection hole 201. It can be understood that when the first seal fails, the second seal acts as a firewall to seal the injection hole 201.

[0058] The suction nozzle 22 may be made of a flexible material such as silicone or rubber, so that when the low negative pressure mechanism 30 and the high negative pressure mechanism 40 are working, the suction nozzle 22 is deformed in response to the internal and external atmospheric pressures to seal the injection hole 201 .

[0059] Please continue reading Figure 1 The adsorption mechanism 20 further includes a gas-liquid separator 26 and a micro-mist separator 28. The buffer cup 24, the gas-liquid separator 26, and the micro-mist separator 28 are connected in sequence, and the buffer cup 24 is connected to the low negative pressure mechanism 30 and the high negative pressure mechanism 40 respectively through the micro-mist separator 28. After the gas extracted from the single battery 200 by the low negative pressure mechanism 30 and the high negative pressure mechanism 40 passes through the buffer cup 24, the gas-liquid separator 26, and the micro-mist separator 28 in sequence, the liquid in the gas is completely filtered out through three-stage filtration to prevent the liquid from being transmitted to the low negative pressure mechanism 30 and the high negative pressure mechanism 40.

[0060] The gas-liquid separator 26 adopts many separation structures, and its separation methods include: 1. gravity sedimentation; 2. baffle separation; 3. centrifugal separation; 4. wire mesh separation; 5. ultrafiltration separation; 6. packing separation, etc.

[0061] A brief description of the principle of gravity sedimentation: Due to the different specific gravities of gas and liquid, when liquid flows with gas, the liquid will be affected by gravity to a greater extent, resulting in a downward speed, while the gas still flows in the original direction. In other words, the liquid and gas tend to separate in the gravity field, and the downward liquid adheres to the wall, gathers together, and is discharged through the discharge pipe.

[0062] Brief description of the baffle separation principle: Due to the different specific gravities of gas and liquid, when liquid and gas are mixed and flow together, if they encounter an obstruction, the gas will bend away, while the liquid will continue to have a forward speed due to inertia. The forward-flowing liquid adheres to the obstruction wall and gathers downward due to gravity and is discharged through the discharge pipe.

[0063] Brief description of the centrifugal separation principle: Due to the different densities of gas and liquid, when liquid and gas are mixed and flow together, the centrifugal force on the liquid is greater than that on the gas, so the liquid tends to be centrifugally separated. The liquid adheres to the separation wall and gathers downward due to gravity and is discharged through the discharge pipe.

[0064] Brief description of packing separation principle: Due to the different densities of gas and liquid, when liquid and gas flow together, if they encounter an obstruction, the gas will bend away, while the liquid will continue to move forward due to inertia. The forward liquid adheres to the surface of the blocking filler and gathers together downward due to gravity and is discharged through the discharge pipe. Since the filler has a larger blocking wall area than ordinary baffle classification, and the liquid is more likely to adhere to the wall after repeated baffles, its separation efficiency is higher.

[0065] The working principle of the micro mist separator 28 is that when the two-phase flow (suspended particles and air) enters the separator from the tangential conduit, it will rotate along the inner wall of the separator. At this time, they will be affected by the combined effects of centrifugal force, gravity and friction. Because the solid material is subject to large friction, its rotation speed gradually decreases, and it sinks to the bottom of the separator and is discharged; at this time, the friction force on the airflow is small, and the speed is reduced less. When rotating and falling, it is refracted by the cone and bends upward, making a swirling upward motion, forming an inner layer of upward swirling airflow, and finally discharged from the top exhaust pipe, that is, the gas-matter separation is completed. Among them, particles or powders with smaller diameters are often drawn into the upward swirling airflow before reaching the wall and discharged from the top.

[0066] Please continue reading Figure 1 It is worth noting that the low negative pressure mechanism 30 and the high negative pressure mechanism 40 are relative concepts. Specifically, the air extraction speed of the low negative pressure mechanism 30 is lower than that of the high negative pressure mechanism 40. As the name implies, the low negative pressure mechanism 30 creates a low negative pressure environment for the single battery 200, and the high negative pressure mechanism 40 creates a high negative pressure environment for the single battery 200.

[0067] The low negative pressure mechanism 30 includes a low negative pressure source 31, a first pressure regulating valve 32, a first vacuum valve 33, an air source 80, a first solenoid valve 35 and a first cylinder 36. The low negative pressure source 31, the first pressure regulating valve 32, the first vacuum valve 33 and the adsorption mechanism 20 are connected in sequence, the air source 80, the first solenoid valve 35 and the first cylinder 36 are connected in sequence, and the output end of the first cylinder 36 is connected to the first vacuum valve 33. The air source 80 and the first solenoid valve 35 are used to control the movement of the first cylinder 36, and the first cylinder 36 is used to control the opening and closing of the first vacuum valve 33. The first pressure regulating valve 32 is used to adjust the output pressure of the low negative pressure mechanism 30.

[0068] When the first solenoid valve 35 is powered on, the air in the air source 80 enters the first cylinder 36 to move the first cylinder 36, and then the first vacuum valve 33 is opened. When the first vacuum valve 33 is opened, the low negative pressure source 31 draws air through the adsorption mechanism 20 to extract the gas in the single battery 200. When the first solenoid valve 35 is powered off, the air in the air source 80 is separated from the first cylinder 36 to move the first cylinder 36 in the opposite direction, and then the first vacuum valve 33 is closed, so that the low negative pressure source 31 no longer draws air from the single battery 200 through the adsorption mechanism 20.

[0069] The high negative pressure mechanism 40 includes a high negative pressure source 41, a second pressure regulating valve 42, a second vacuum valve 43, an air source 80, a second solenoid valve 45 and a second cylinder 46. The high negative pressure source 41, the second pressure regulating valve 42, the second vacuum valve 43 and the adsorption mechanism 20 are connected in sequence, the air source 80, the second solenoid valve 45 and the second cylinder 46 are connected in sequence, and the output end of the second cylinder 46 is connected to the second vacuum valve 43. The air source 80 and the second solenoid valve 45 are used to control the movement of the second cylinder 46, and the second cylinder 46 is used to control the opening and closing of the second vacuum valve 43. The second pressure regulating valve 42 is used to adjust the output pressure of the high negative pressure mechanism 40.

[0070] When the second solenoid valve 45 is powered on, the air in the air source 80 enters the second cylinder 46 to move the second cylinder 46, and then the second vacuum valve 43 is opened. When the second vacuum valve 43 is opened, the high negative pressure source 41 draws air through the adsorption mechanism 20 to extract the gas in the single battery 200. When the second solenoid valve 45 is powered off, the air in the air source 80 is separated from the second cylinder 46 to move the second cylinder 46 in the opposite direction, and then the second vacuum valve 43 is closed, so that the high negative pressure source 41 no longer draws air from the single battery 200 through the adsorption mechanism 20.

[0071] The suction speed of the low negative pressure source 31 is lower than the suction speed of the high negative pressure source 41 .

[0072] The negative pressure formation system 100 further includes a vacuum breaking mechanism 70 connected to the adsorption mechanism 20, and the vacuum breaking mechanism 70 is used to balance the internal and external air pressures of the adsorption mechanism 20. Specifically, after the low negative pressure mechanism 30 and the high negative pressure mechanism 40 stop working, the vacuum breaking mechanism 70 ventilates the single battery 200 through the adsorption mechanism 20 to make the internal and external pressures of the adsorption mechanism 20 consistent, thereby facilitating the removal of the adsorption mechanism 20.

[0073] Specifically, the dry gas source 71, the filter 72, the third vacuum valve 73, the air source 80, the third solenoid valve 75 and the third cylinder 76 are connected in sequence, the dry gas source 71, the filter 72, the third vacuum valve 73 and the adsorption mechanism 20 are connected in sequence, the air source 80, the third solenoid valve 75 and the third cylinder 76 are connected in sequence, and the output end of the third cylinder 76 is connected to the third vacuum valve 73. The air source 80 and the third solenoid valve 75 are used to control the movement of the third cylinder 76, and the third cylinder 76 is used to control the opening and closing of the third vacuum valve 73.

[0074] When the third solenoid valve 75 is powered on, the air in the air source 80 enters the third cylinder 76 to move the third cylinder 76, and then the third vacuum valve 73 is opened; when the third vacuum valve 73 is in an open state, the gas in the dry gas source 71 enters the single battery 200 to balance the internal and external air pressures of the adsorption mechanism 20. When the third solenoid valve 75 is powered off, the air in the air source 80 is separated from the third cylinder 76 to move the third cylinder 76 in the opposite direction, and then the third vacuum valve 73 is closed, so that the dry gas source 71 no longer inflates the single battery 200 through the adsorption mechanism 20.

[0075] The high negative pressure mechanism 40 , the low negative pressure mechanism 30 , and the vacuum breaking mechanism 70 may share an air source 80 .

[0076] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the application concept of the present application, or direct / indirect application in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A negative pressure formation system, characterized in that: The negative pressure formation system comprises: A positioning mechanism, comprising a fixing plate and positioning blocks connected to opposite ends of the fixing plate, wherein the positioning blocks are used to position the single battery; An adsorption mechanism, used to communicate with the liquid injection hole of the single battery; A low negative pressure mechanism is connected to the adsorption mechanism, and is used to evacuate the single cell through the adsorption mechanism when the single cell is transformed into a high-speed exhaust gas; A high negative pressure mechanism is connected to the adsorption mechanism, and is used to evacuate the single cell through the adsorption mechanism when the single cell is transformed into a low-speed exhaust gas; The adsorption mechanism comprises a suction nozzle, the suction nozzle comprises a main body, a first sealing part and a second sealing part, the main body is provided with a channel for communicating with the injection hole; The first sealing part and the second sealing part are respectively connected to the main body and are spaced apart from each other to surround the channel, the first sealing part is used to abut against the inner wall of the injection hole, and the second sealing part is used to abut against the top cover of the single battery; The first sealing portion is protruding from the surface of the second sealing portion, and is used for being inserted into the injection hole and abutting against the inner wall of the injection hole. The second sealing portion is arranged around the first sealing portion.

2. The negative pressure formation system according to claim 1, characterized in that: The positioning block is provided with a fixing groove, and the fixing groove is used to position the single battery; the positioning block is provided with a guide opening corresponding to the fixing groove, and the guide opening is trumpet-shaped to facilitate the single battery to enter the fixing groove.

3. The negative pressure formation system according to claim 1, characterized in that: The negative pressure formation system further comprises a temperature probe connected to the fixing plate, wherein the temperature probe is used to detect the temperature of the single battery; and / or The negative pressure formation system further comprises a probe connected to the fixing plate, wherein the probe is used to be electrically connected to the electrode of the single cell.

4. The negative pressure formation system according to claim 1, characterized in that: The adsorption mechanism includes a buffer cup, the suction nozzle is used to communicate with the injection hole, one end of the buffer cup is connected to the suction nozzle, and the opposite end of the buffer cup is respectively connected to the low negative pressure mechanism and the high negative pressure mechanism; the channel is connected to the buffer cup.

5. The negative pressure formation system according to claim 4, characterized in that: The adsorption mechanism also includes a gas-liquid separator and a micro-mist separator. The buffer cup, the gas-liquid separator and the micro-mist separator are connected in sequence. The buffer cup is connected to the low negative pressure mechanism and the high negative pressure mechanism respectively through the micro-mist separator.

6. The negative pressure formation system according to claim 1, characterized in that: The low negative pressure mechanism comprises a low negative pressure source, a first pressure regulating valve, a first vacuum valve, an air source, a first solenoid valve and a first cylinder, wherein the low negative pressure source, the first pressure regulating valve, the first vacuum valve and the adsorption mechanism are connected in sequence, the air source, the first solenoid valve and the first cylinder are connected in sequence, and the output end of the first cylinder is connected to the first vacuum valve; When the first solenoid valve is powered on, the air in the air source enters the first cylinder so that the first cylinder opens the first vacuum valve; when the first vacuum valve is open, the low negative pressure source draws air through the adsorption mechanism.

7. The negative pressure formation system according to claim 1, characterized in that: The high negative pressure mechanism comprises a high negative pressure source, a second pressure regulating valve, a second vacuum valve, an air source, a second solenoid valve and a second cylinder, wherein the high negative pressure source, the second pressure regulating valve, the second vacuum valve and the adsorption mechanism are connected in sequence, the air source, the second solenoid valve and the second cylinder are connected in sequence, and the output end of the second cylinder is connected to the second vacuum valve; When the second solenoid valve is powered on, the air in the air source enters the second cylinder so that the second cylinder opens the second vacuum valve; when the second vacuum valve is open, the high negative pressure source draws air through the adsorption mechanism.

8. The negative pressure formation system according to claim 1, characterized in that: The negative pressure formation system further comprises a vacuum breaking mechanism connected to the adsorption mechanism, and the vacuum breaking mechanism is used to balance the internal and external air pressures of the adsorption mechanism.

9. The negative pressure formation system according to claim 8, characterized in that: The vacuum breaking mechanism comprises a dry gas source, a filter, a third vacuum valve, an air source, a third solenoid valve and a third cylinder. The dry gas source, the filter, the third vacuum valve and the adsorption mechanism are connected in sequence. The air source, the third solenoid valve and the third cylinder are connected in sequence. The output end of the third cylinder is connected to the third vacuum valve. When the third solenoid valve is energized, the air in the air source enters the third cylinder so that the third cylinder opens the third vacuum valve; when the third vacuum valve is in an open state, the gas in the dry air source enters the single cell to balance the internal and external air pressures of the adsorption mechanism.

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