A formation device

Abstract

The utility model provides a kind of formation equipment, it includes: negative pressure cup and pressure control mechanism, the both ends of the negative pressure cup are equipped with air duct respectively;The pressure control mechanism is equipped on the negative pressure cup;The pressure control mechanism includes control valve and pressure detection element respectively equipped on the air duct;The control valve is used to control the air pressure in the negative pressure cup, and the pressure detection element is used to detect the air pressure of the negative pressure cup.The formation equipment can detect the formation gas of the battery cell in real time during lithium ion battery formation process, and can be applied to mass production.

Description

Technical Field

[0001] This utility model relates to the field of battery manufacturing technology, and in particular to a formation device. Background Technology

[0002] In the lithium-ion battery manufacturing process, formation is the process by which a single battery cell is activated during its first charge to form an SEI (solid electrolyte interphase) film. Formation treatment ensures a complete SEI film on the negative electrode surface, thereby giving the battery stable cycle performance. During formation, the reaction that forms the SEI film, as well as other side reactions, generate gases, including hydrocarbon gases such as C2H4 and inorganic gases such as CO2 and H2. Formation gas generation has a significant impact on the battery's electrochemical performance, cycle performance, and safety performance; therefore, research on formation gas generation is of great importance. However, current formation gas detection processes require the addition of a separate detection device to the formation cabinet, and the compatibility between this device and the production line's formation cabinet is poor, hindering mass production line implementation and enabling testing of the gas generation amount for each battery cell.

[0003] Therefore, there is a need to provide a formation device that can detect the formation gas of battery cells in real time and is suitable for batch testing. Utility Model Content

[0004] The purpose of this invention is to solve the above-mentioned problems and provide a formation device that can detect the formation gas of the battery cell in real time during the lithium-ion battery formation process and is suitable for mass production.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: This utility model provides a chemical formation device, which includes: The negative pressure cup has air guide tubes at both ends; A pressure control mechanism is provided on the negative pressure cup; the pressure control mechanism includes control valves respectively provided on the air guide tubes and pressure detection elements provided on at least one of the air guide tubes; the control valves are used to control the air pressure in the negative pressure cup, and the pressure detection elements are used to detect the air pressure in the negative pressure cup.

[0006] Optionally, the negative pressure cup includes a cup body and a cup lid covering the cup body, the air guide tube includes a first air guide tube on the cup lid and a second air guide tube at the bottom of the cup body, the control valve includes a first control valve and a second control valve respectively on the first air guide tube and the second air guide tube, and the pressure detection element is located in the area of ​​the first air guide tube between the first control valve and the cup lid.

[0007] Optionally, the control valve is a solenoid valve with bidirectional transmission control.

[0008] Optionally, the cup lid can be detachably attached to the cup body.

[0009] Optionally, the formation device further includes a connecting component located at the end of the second gas guide tube away from the cup body. The connecting component is used to connect the negative pressure cup to the liquid injection port of the battery cell. The second control valve is located on the section of the second gas guide tube between the connecting component and the cup body.

[0010] Optionally, the connecting assembly includes an adapter detachably connected to the second air tube and a suction nozzle disposed at the end of the adapter away from the second air tube.

[0011] Optionally, the formation device further includes a negative pressure generating device, which is used to create a negative pressure environment inside the negative pressure cup.

[0012] Optionally, a gas-liquid separator is provided between the negative pressure generating device and the first gas guide pipe, the gas-liquid separator being used to separate the electrolyte and the formation gas.

[0013] Optionally, it also includes an inflation device for inflating the negative pressure cup to create a positive pressure state inside the negative pressure cup.

[0014] The beneficial effects of this utility model include at least the following: The formation equipment of this invention includes a negative pressure cup and a pressure control mechanism mounted on the negative pressure cup. This formation equipment can detect the gas generated during the formation process by simply modifying the structure of the existing negative pressure cup on the production line, without the need for additional detection devices. In use, the pressure detection element monitors the gas pressure in the negative pressure cup in real time. By measuring the pressure values ​​from the start to the end of the formation process, the amount of gas generated during the formation process can be estimated. Through the cooperation of the control valves mounted on the gas guide pipe, the gas generated during formation can be collected. Analyzing the composition and proportion of the collected formation gas facilitates a more comprehensive understanding of the cell formation process. Furthermore, due to the sealed design of this solution, the gas generated during formation can be collected, which is beneficial for analyzing its composition and proportion, and for better understanding the reaction of the formation process. Attached Figure Description

[0015] Figure 1 This is an assembly diagram of the negative pressure cup of this utility model.

[0016] Figure 2 This is a schematic diagram of the chemical formation equipment of this utility model.

[0017] Among them, 1-negative pressure cup, 11-cup body, 12-cup lid, 2-air guide tube, 21-first air guide tube, 22-second air guide tube, 3-pressure control mechanism, 31-control valve, 311-first control valve, 312-second control valve, 32-pressure detection element, 4-connecting assembly, 41-adapter, 42-nozzle, 5-negative pressure generating device, 6-gas-liquid separator, 7-air filling device. Detailed Implementation

[0018] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0019] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component.

[0020] In this utility model, the use of terms such as "first" and "second" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated.

[0021] This invention provides a formation device, which is applicable to the formation process of lithium-ion batteries, including square lithium-ion batteries, and can perform batch and real-time detection of formation gas during the formation process.

[0022] See Figure 1 As shown, it includes: Negative pressure cup 1, with air guide tubes 2 at both ends; A pressure control mechanism 3 is provided on the negative pressure cup 1; the pressure control mechanism 3 includes a control valve 31 respectively provided on the air guide pipe 2 and a pressure detection element 32 provided on at least one of the air guide pipes 2; the control valve 31 is used to control the air pressure in the negative pressure cup 1, and the pressure detection element 32 is used to detect the air pressure in the negative pressure cup 1.

[0023] The formation equipment of this utility model includes a negative pressure cup 1 and a pressure control mechanism 3 disposed on the negative pressure cup 1. The formation equipment can detect the gas generated during the formation process by simply modifying the structure of the negative pressure cup 1 on the existing production line, without the need for additional detection devices. In use, the pressure detection element 32 detects the gas pressure of the negative pressure cup 1 in real time. By measuring the pressure value from the beginning to the end of the formation process, the amount of gas generated during the formation process can be estimated. Through the cooperation of the control valves disposed on the gas guide pipe 2, the gas generated during formation can be collected. By analyzing the composition and proportion of the collected formation gas, a more comprehensive understanding of the cell formation process can be obtained.

[0024] The negative pressure cup 1 includes a cup body 11 and a cup lid 12 covering the cup body 11. The gas guide tube 2 includes a first gas guide tube 21 on the cup lid 12 and a second gas guide tube 22 at the bottom of the cup body 11. The control valve 31 includes a first control valve 311 and a second control valve 312 respectively located on the first gas guide tube 21 and the second gas guide tube 22. The pressure detection element 32 is located on the first gas guide tube 21 in the area between the first control valve 311 and the cup lid 12. The first control valve 311 and the second control valve 312 are respectively provided on the two gas guide tubes 2 of the negative pressure cup 1. Through the cooperation between the first control valve 311 and the second control valve 312, gas can pass through the first gas guide tube 21 and / or the second gas guide tube 22, realizing the control of keeping the negative pressure cup 1 sealed, or allowing one-way or two-way ventilation, as well as the recovery of the vaporized electrolyte. For example, when negative pressure is required in the negative pressure cup 1 to allow the gas generated during the formation process inside the battery cell to flow smoothly and quickly into the negative pressure cup 1, both the first control valve 311 and the second control valve 312 are in the open state. When the negative pressure in the negative pressure cup 1 reaches the process requirements, the first control valve 311 is closed, so that the battery cell and the negative pressure cup 1 form a sealed space. When the formation process is completed and the formation gas needs to be collected, the first control valve 311 is opened to extract the formation gas stored in the negative pressure cup 1.

[0025] Optionally, the control valve 31 is a bidirectional transmission control solenoid valve. Using a solenoid valve for the control valve 31 makes its control method more efficient and intelligent. During use, it can be directly controlled by electrical signals, eliminating the need for manual operation and making it more suitable for automated production lines. The solenoid valve also features fast switching response and high control precision.

[0026] Optionally, the cup lid 12 is detachably connected to the cup body 11. This detachable connection facilitates cleaning of the negative pressure cup 1 and prevents electrolyte residue buildup and crystallization within the cup body 11, which could block the venting tube 2. Optionally, in some embodiments, the cup lid 12 and the cup body 11 are connected by a threaded connection; in other embodiments, they are connected by a locking assembly; and in still other embodiments, they are connected by an elastic connector, such as an elastic sealing ring on the cup lid 12, which expands and tightens between the connection areas of the cup lid 12 and the cup body 11 when they are connected.

[0027] Optionally, the formation device further includes a connecting component 4 located at the end of the second air guide tube 22 away from the cup body 11. The connecting component 4 is used to connect the negative pressure cup 1 to the liquid injection port of the battery cell. The second control valve 312 is located on the section of the second air guide tube 22 between the connecting component 4 and the cup body 11.

[0028] Optionally, in some embodiments, the connecting assembly 4 includes an adapter 41 detachably connected to the second air guide tube 22 and a suction nozzle 42 disposed at the end of the adapter 41 away from the second air guide tube 22. The connecting assembly 4 is detachably connected to the second air guide tube 22 via the adapter 41; in use, the connecting assembly 4 can be replaced according to the size of the liquid injection port of different battery cells to ensure the airtightness of the connection between the negative pressure cup 1 and the battery cell, ensure the accuracy of the detection of gas generation during battery cell formation, and ensure compatibility with different battery cells.

[0029] See Figure 1 and Figure 2 As shown, in some embodiments, a negative pressure generating device 5 is further included, which is used to create a negative pressure environment inside the negative pressure cup 1. Optionally, the negative pressure generating device 5 is used to create a negative pressure state inside the negative pressure cup 1 before formation; and to extract the gas inside the negative pressure cup 1 after formation.

[0030] In some embodiments, the negative pressure generating device 5 includes a vacuum pump and a gas collecting device. During use, the vacuum pump is connected to the first gas guide pipe 21, and the outlet of the vacuum pump is connected to the gas collecting device. The vacuum pump draws formation gas from the negative pressure cup 1, and the formation gas enters the gas collecting device through the outlet of the vacuum pump. Collecting the formation gas facilitates the analysis of its composition and proportion, leading to a better understanding of the formation process.

[0031] Furthermore, a gas-liquid separator 6 is provided between the negative pressure generating device 5 and the first gas guide pipe 21. The gas-liquid separator 6 is used to separate the electrolyte and the formation gas. During the formation process, under the negative pressure of the negative pressure cup 1, in addition to the gas generated during formation, the electrolyte in the battery cell also enters the negative pressure cup 1. The gas-liquid separator 6 can separate the electrolyte and the formation gas, ensuring that the formation gas can be smoothly discharged while avoiding the discharge of electrolyte and the waste of electrolyte. It can be understood that the electrolyte entering the negative pressure cup 1 includes the case where part of the electrolyte solvent vaporizes into gas during the formation process and enters the negative pressure cup 1, and may also include the case where part of the liquid electrolyte enters the negative pressure cup 1.

[0032] In some embodiments, an inflation device 7 is further included, which is used to inflate the negative pressure cup 1 to create a positive pressure state within the negative pressure cup 1. The inflation device 7 raises the negative pressure cup 1 after formation, allowing the electrolyte entering the negative pressure cup 1 to flow back into the cell, reducing electrolyte loss due to negative pressure formation. In some embodiments, when reinjecting electrolyte, the second control valve 312 is closed, the first control valve 311 is opened, and the inflation device 7 inflates the negative pressure cup 1, increasing the pressure within the negative pressure cup 1. After pressurization, the second control valve 312 is opened, allowing the electrolyte to flow back into the cell. During the electrolyte flow back into the cell, the first control valve 311 is either closed or open. When the first control valve 311 is open, the inflation device 7 maintains an inflated state.

[0033] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0034] The above embodiments only illustrate preferred implementations of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the appended claims.

Claims

1. A chemical formation device, characterized in that, include: The negative pressure cup has air guide tubes at both ends; A pressure control mechanism is provided on the negative pressure cup; the pressure control mechanism includes control valves respectively provided on the air guide tubes and pressure detection elements provided on at least one of the air guide tubes; the control valves are used to control the air pressure in the negative pressure cup, and the pressure detection elements are used to detect the air pressure in the negative pressure cup.

2. The chemical formation equipment according to claim 1, characterized in that, The negative pressure cup includes a cup body and a cup lid covering the cup body. The air guide tube includes a first air guide tube on the cup lid and a second air guide tube at the bottom of the cup body. The control valve includes a first control valve and a second control valve respectively located on the first air guide tube and the second air guide tube. The pressure detection element is located in the area of ​​the first air guide tube between the first control valve and the cup lid.

3. The chemical formation equipment according to claim 1, characterized in that, The control valve is a bidirectional transmission control solenoid valve.

4. The chemical formation equipment according to claim 2, characterized in that, The cup lid is detachably attached to the cup body.

5. The chemical formation equipment according to claim 2, characterized in that, The formation device further includes a connecting component located at the end of the second gas guide tube away from the cup body. The connecting component is used to connect the negative pressure cup to the liquid injection port of the battery cell. The second control valve is located on the section of the second gas guide tube between the connecting component and the cup body.

6. The chemical formation equipment according to claim 5, characterized in that, The connecting assembly includes an adapter detachably connected to the second air tube and a suction nozzle located at the end of the adapter away from the second air tube.

7. The chemical formation equipment according to claim 2, characterized in that, The formation equipment also includes a negative pressure generating device, which is used to create a negative pressure environment inside the negative pressure cup.

8. The chemical formation equipment according to claim 7, characterized in that, A gas-liquid separator is provided between the negative pressure generating device and the first gas guide pipe. The gas-liquid separator is used to separate the electrolyte and the chemical formation gas.

9. The chemical formation equipment according to claim 1, characterized in that, It also includes an inflation device for inflating the negative pressure cup to create a positive pressure state inside the negative pressure cup.

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