Nitrogen recovery system for standing bell jar of one-time liquid injection machine

Abstract

The utility model discloses a nitrogen recovery system for a standing bell jar of a primary liquid injection machine, which comprises a recovery gas pipe connected to the standing bell jar and a recovery tank connected with the recovery gas pipe, the recovery tank is connected with a gas inlet pipe, and pneumatic valves are arranged on a pipeline between the gas inlet pipe and the recovery tank and on the recovery gas pipe. The recycling tank comprises a storage tank body, a temperature control cavity arranged outside the storage tank body, a first gas inlet assembly and a second gas inlet assembly, the first gas inlet assembly and the second gas inlet assembly are communicated with the temperature control cavity, gas with different temperatures is introduced into the first gas inlet assembly and the second gas inlet assembly respectively, and a pressure release valve is arranged on the temperature control cavity. Nitrogen in the standing bell jar enters the recovery tank through the recovery gas pipe, partial recovery of the nitrogen can be achieved, and compared with a waste gas system which directly discharges the nitrogen out of a factory, the scheme can reduce energy consumption of equipment and save production and operation cost.

Description

Technical Field

[0001] This utility model relates to the field of nitrogen recovery, and more specifically, to a nitrogen recovery system for a static bell jar of a primary liquid injection machine. Background Technology

[0002] The "electrolyte injection" process in lithium-ion batteries typically refers to the step of injecting electrolyte during battery manufacturing. This process occurs during lithium-ion battery assembly and primarily ensures that the battery can function properly and provide the required electrochemical performance. The electrolyte injection process usually occurs during the cell assembly stage of lithium-ion batteries. Nitrogen, as an inert gas, has high stability and does not react with other components inside the battery, thus providing a stable and safe atmosphere. Through continuous nitrogen circulation, the internal atmosphere of the battery can be kept unaffected by changes in the external environment, reducing the entry of oxygen or water vapor into the lithium-ion battery.

[0003] In a single injection process, the nitrogen used to pressurize the static bell jar of the injection machine during the injection cycle is directly discharged into the plant's waste gas system (e.g., during the release of positive pressure). Figure 1 As shown in the figure, this results in energy waste. Utility Model Content

[0004] The purpose of this invention is to provide a nitrogen recovery system for a static bell jar of a liquid injection machine, in order to solve the technical problems existing in the background art.

[0005] This utility model provides a nitrogen recovery system for a static bell jar of a liquid injection machine, including a recovery gas pipe connected to the static bell jar, a recovery tank connected to the recovery gas pipe, an inlet pipe connected to the recovery tank, and pneumatic valves installed on the pipeline between the inlet pipe and the recovery tank, as well as on the recovery gas pipe.

[0006] The recovery tank includes a storage tank body, a temperature control chamber disposed outside the storage tank body, and an air inlet assembly one and an air inlet assembly two communicating with the temperature control chamber. The air inlet assembly one and the air inlet assembly two are respectively introduced with gases at different temperatures, and a pressure relief valve is provided on the temperature control chamber.

[0007] In a preferred embodiment, the storage tank is provided with a gas guide pipe connecting the gas inlet and the gas outlet, and the gas guide pipe is provided with several sets of dispersion elements for dispersing nitrogen gas at intervals.

[0008] In a preferred embodiment, the dispersing element includes a dispersing tube circumferentially disposed outside the air guide tube, and a plurality of air outlet holes are uniformly distributed on the dispersing tube.

[0009] In a preferred embodiment, a plurality of pressure sensors are arranged on the storage tank along the length of the storage tank.

[0010] In a preferred embodiment, the nitrogen pressure inside the storage tank is 6-8 MPa.

[0011] In a preferred embodiment, both the first air intake assembly and the second air intake assembly include an annular air intake pipe and a plurality of guide air pipes connected to the annular air intake pipe. The guide air pipes are connected to the temperature control cavity and are dispersedly arranged on the outer periphery of the temperature control cavity.

[0012] In a preferred embodiment, temperature sensors are provided in both the temperature control cavity and the storage tank.

[0013] The beneficial effects of this utility model's technical solution are:

[0014] Nitrogen gas inside the static bell jar is returned to the recovery tank via a recovery gas pipe, enabling partial recovery of nitrogen gas. Compared to the waste gas system that directly discharges nitrogen gas into the plant, this solution can reduce equipment energy consumption and save production and operating costs. Attached Figure Description

[0015] Figure 1 This is a nitrogen path diagram for a single injection process in the existing technology.

[0016] Figure 2 This is a nitrogen path diagram for the single-stage liquid injection process of this utility model.

[0017] Figure 3 This is a schematic diagram of the overall structure of the recycling tank of this utility model.

[0018] Figure 4 This is a schematic diagram of the internal structure of the storage tank of this utility model.

[0019] Explanation of reference numerals in the attached diagram: 1. Static bell jar; 2. Recovered gas pipe; 3. Recovered tank; 31. Storage tank; 311. Inlet; 312. Outlet; 313. Guide pipe; 314. Dispersion pipe; 32. Temperature control chamber; 33. Inlet assembly one; 34. Inlet assembly two; 35. Annular inlet pipe; 36. Guide pipe; 37. Pressure sensor; 38. Temperature sensor; 4. Inlet pipe; 5. Pneumatic valve one; 6. Booster pump; 7. High-pressure gas storage tank; 8. Pneumatic valve two; 9. Pneumatic valve three; 10. Pneumatic valve four. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical applications of the present invention, and to enable those skilled in the art to understand the present invention and design various embodiments with various modifications suitable for a particular purpose.

[0021] like Figure 2-4 As shown, the present invention provides a nitrogen recovery system for a static bell jar 1 of a liquid injection machine, including a recovery gas pipe 2 connected to the static bell jar 1, a recovery tank 3 connected to the recovery gas pipe 2, an inlet pipe 4 connected to the recovery tank 3, and pneumatic valves provided on the pipeline between the inlet pipe 4 and the recovery tank 3, as well as on the recovery gas pipe 2.

[0022] The recycling tank 3 includes a storage tank 31, a temperature control chamber 32 disposed outside the storage tank 31, and an air intake assembly 33 and an air intake assembly 34 communicating with the temperature control chamber 32. The air intake assembly 33 and the air intake assembly 34 are respectively introduced with gases of different temperatures. A pressure relief valve is provided on the temperature control chamber 32. Several pressure sensors 37 are provided on the storage tank 31 along the length of the storage tank 31.

[0023] Storage tank 31 is used to store recovered nitrogen. Air inlet assembly 33 and air inlet assembly 34 respectively introduce air at different temperatures into the temperature control chamber 32 to insulate the storage tank 31. Excess gas is discharged through the pressure relief valve to maintain the nitrogen level in storage tank 31 within a certain range, ensuring the stability of the recovered nitrogen and facilitating subsequent recycling. Pressure sensor 37 is used to detect the nitrogen pressure inside storage tank 31. Multiple sensors detect pressures simultaneously. When the pressures detected by multiple sensors are all within the set pressure range, it indicates that the nitrogen storage in storage tank 31 has reached the set amount. The nitrogen pressure value inside storage tank 31 is 6-8 MPa.

[0024] The steps for filling and depressurizing the static bell jar 1 are as follows: Nitrogen gas reaches the booster pump 6 through the inlet pipe 4, and after being pressurized by the booster pump 6, it reaches the high-pressure storage tank 7. When the static bell jar 1 circulates to the positive pressure filling step, pneumatic valve 5 opens, and 0.8 MPa nitrogen gas is injected into the static bell jar 1. When the nitrogen pressure in the static bell jar 1 reaches the process requirement pressure, pneumatic valve 5 closes. When the positive pressure circulation of the static bell jar 1 ends, pneumatic valve 8 opens, and the nitrogen gas in the static bell jar 1 flows through the recovery gas pipe 2 to the recovery tank 3. When the nitrogen pressure in the recovery tank 3 reaches the requirement, pneumatic valve 8 closes, and then pneumatic valve 9 opens to discharge the remaining nitrogen gas in the static bell jar 1 to the plant waste gas recovery system. In the next positive pressure cycle, pneumatic valve 410 is first opened to fill the static bell jar 1 with nitrogen collected in recovery tank 3. When pressure sensor 37 detects that the pressure in recovery tank 3 is equal to 0, pneumatic valve 410 is closed, and then pneumatic valve 5 is opened, repeating step one. The above steps can achieve partial recovery of nitrogen, reduce equipment energy consumption, and save production and operating costs.

[0025] The storage tank 31 is equipped with a gas guide pipe 313 connecting the gas inlet 311 and the gas outlet 312. Several sets of dispersion elements for dispersing nitrogen gas are spaced apart on the gas guide pipe 313. Each dispersion element includes a dispersion tube 314 circumferentially disposed outside the gas guide pipe 313, with several gas outlet holes evenly distributed on the dispersion tube 314. The recovered nitrogen gas enters the gas guide pipe 313, then flows through the gas guide pipe 313 into the dispersion tube 314, and finally enters the storage unit through the gas outlet holes on the dispersion tube 314. This design allows the nitrogen gas to disperse into the storage tank 31, providing a buffering effect to some extent and increasing the safety of the recovery process.

[0026] Both the first air intake assembly 33 and the second air intake assembly 34 include an annular air intake pipe 435 and several guide air pipes 36 connected to the annular air intake pipe 435. The guide air pipes 36 are connected to the temperature control chamber 32 and are distributed around the outer periphery of the temperature control chamber 32. Temperature sensors 38 are installed in both the temperature control chamber 32 and the storage tank 31. The first air intake assembly 33 and the second air intake assembly 34 supply gases of different temperatures. The temperature sensors 38 can monitor the temperature inside the temperature control chamber 32 and the storage tank 31 to adjust the air intake ratio of the first air intake assembly 33 and the second air intake assembly 34 in a timely manner, maintaining a relatively stable temperature inside the storage tank 31.

[0027] Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art and related fields based on the embodiments of this utility model without creative effort should fall within the protection scope of this utility model. Structures, devices, and operating methods not specifically described and explained in this utility model, unless otherwise specified or limited, shall be implemented according to conventional means in the art.

Claims

1. A nitrogen recovery system for a static bell jar in a single-stage liquid injection machine, characterized in that: It includes a recovery air pipe connected to a stationary bell jar, a recovery tank connected to the recovery air pipe, an air inlet pipe connected to the recovery tank, and pneumatic valves installed on the pipeline between the air inlet pipe and the recovery tank, as well as on the recovery air pipe. The recovery tank includes a storage tank body, a temperature control chamber disposed outside the storage tank body, and an air inlet assembly one and an air inlet assembly two communicating with the temperature control chamber. The air inlet assembly one and the air inlet assembly two are respectively introduced with gases at different temperatures, and a pressure relief valve is provided on the temperature control chamber.

2. The nitrogen recovery system for the static bell jar of the single-stage injection machine according to claim 1, characterized in that: The storage tank is equipped with a gas guide pipe connecting the gas inlet and the gas outlet, and several sets of dispersion elements for dispersing nitrogen are arranged at intervals on the gas guide pipe.

3. The nitrogen recovery system for the static bell jar of the primary injection machine according to claim 2, characterized in that: The dispersing component includes a dispersing tube circumferentially disposed outside the air guide tube, and a plurality of air outlet holes are uniformly distributed on the dispersing tube.

4. The nitrogen recovery system for the static bell jar of the primary injection machine according to claim 1, characterized in that: Several pressure sensors are installed on the storage tank along its length.

5. The nitrogen recovery system for the static bell jar of the primary injection machine according to claim 1, characterized in that: The nitrogen pressure inside the storage tank is 6-8 MPa.

6. The nitrogen recovery system for the static bell jar of the single-stage injection machine according to claim 1, characterized in that: Both the first air intake assembly and the second air intake assembly include an annular air intake pipe and a plurality of guide air pipes connected to the annular air intake pipe. The guide air pipes are connected to the temperature control cavity and are dispersedly arranged on the outer periphery of the temperature control cavity.

7. The nitrogen recovery system for the static bell jar of the primary injection machine according to claim 1, characterized in that: Temperature sensors are installed in both the temperature control chamber and the storage tank.

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