Method, apparatus, and system for cell formation venting

Abstract

This application provides a cell formation venting method, apparatus, and system. The method is applied to a cell formation venting device including a negative pressure regulating device, a detection and control device, and at least one negative pressure cup. The method includes: acquiring the liquid level height of each negative pressure cup in real time; determining whether there is a target negative pressure cup with a liquid level height higher than a first preset liquid level height among the multiple negative pressure cups; if there is a target negative pressure cup with a liquid level height higher than the first preset liquid level height among the multiple negative pressure cups, then executing a target venting strategy on the target charging cell corresponding to the target negative pressure cup; wherein, the target venting strategy includes: controlling the target charging cell to pause charging, and using a preset frequency to control the negative pressure ratio of the negative pressure regulating device to switch between an initial negative pressure ratio and an adjusted negative pressure ratio; the initial negative pressure ratio is used to drive the electrolyte to be drawn into the target negative pressure cup, and the adjusted negative pressure ratio is used to drive the electrolyte to flow back to the target charging cell.

Description

Technical Field

[0001] This application relates to the field of battery cell technology, and more specifically, to a battery cell formation degassing method, equipment, and system. Background Technology

[0002] Formation is the initial charging process of a lithium-ion battery cell during manufacturing. It involves forming a stable SEI film (solid electrolyte membrane) on the surface of the cell's negative electrode, and is the most crucial step in activating the cell. Gases are generated during formation, and failure to promptly remove these gases can affect the quality of the formed film, leading to problems such as lithium plating at the cell interface and capacity reduction, thus impacting cell quality.

[0003] Currently, common cell formation and degassing methods include segmented formation and function-based segmented adjustment. Segmented formation refers to dividing the entire cell formation process into multiple segments, such as using a small current and high negative pressure in the early stage and a large current and low negative pressure in the later stage to remove formation gases in time. Function-based segmented adjustment refers to obtaining the cell's SOC-gas production curve through preliminary experiments and processing it to obtain the SOC-negative pressure relationship curve. During the formation process, different negative pressures are set according to different SOCs.

[0004] Based on the current common formation and degassing methods, it is known that they rely on a preset fixed negative pressure strategy (such as segmented formation, function segmented adjustment, etc.), which cannot be dynamically adjusted according to the actual gas production of the cell. That is, too low a negative pressure may lead to insufficient gas discharge, while too high a negative pressure may lead to resource waste, affecting the quality of the SEI film and the performance of the cell. Summary of the Invention

[0005] The purpose of this application is to provide a cell formation venting method, device and system to solve the problem that the current cell formation venting method relies on a preset fixed negative pressure strategy that cannot be dynamically adjusted according to the actual gas production of the cell, resulting in insufficient cell venting and affecting cell quality.

[0006] In a first aspect, this application provides a method for venting air during battery cell formation, which is applied to a battery cell formation venting device. The battery cell formation venting device includes: a negative pressure regulating device, a detection and control device, and at least one negative pressure cup. One end of each negative pressure cup is connected to a charging battery cell via a negative pressure branch pipe, and the other end of each negative pressure cup is connected to a first end of the negative pressure regulating device. The second end of the negative pressure regulating device is used to access negative pressure. The detection and control device is electrically connected to the negative pressure regulating device. The method is executed by the detection and control device, and includes: acquiring the liquid level height of each negative pressure cup in real time; determining the liquid level height of multiple negative pressure cups. Does a target negative pressure cup exist with a liquid level higher than the first preset liquid level? If a target negative pressure cup with a liquid level higher than the first preset liquid level exists among multiple negative pressure cups, then a target venting strategy is executed on the target charging cell corresponding to the target negative pressure cup. The target venting strategy includes: controlling the target charging cell to pause charging, and using a preset frequency to control the negative pressure ratio of the negative pressure regulating device to switch between an initial negative pressure ratio and an adjusted negative pressure ratio. The initial negative pressure ratio is used to drive the electrolyte to be drawn into the target negative pressure cup, and the adjusted negative pressure ratio is used to drive the electrolyte to flow back to the target charging cell.

[0007] The aforementioned cell formation venting method correlates the cumulative gas production during cell formation with the electrolyte level in the negative pressure cup. A detection and control device collects the liquid level of each negative pressure cup in real time. Since the gas generated during cell formation pushes the electrolyte through the negative pressure branch pipe into the negative pressure cup, the more gas produced, the more electrolyte enters the negative pressure cup, and the higher the liquid level. Therefore, the liquid level directly maps to the actual gas production rate and amount of the cell. The detection and control device compares the collected liquid level with a first preset liquid level to determine if there is a target negative pressure cup with excessive gas production. When a target negative pressure cup exists, it indicates abnormal gas production in the corresponding target charging cell. In this case, a target venting strategy needs to be executed: first, control the target... The charging process pauses when the battery cell is charging to prevent continuous gas production and accumulation during charging. A preset frequency control device switches between an initial negative pressure ratio and an adjusted negative pressure ratio. In the initial negative pressure phase, a higher negative pressure draws the electrolyte carrying unexpelled gas from the battery cell into a negative pressure cup, separating the gas from the electrolyte. In the adjusted negative pressure phase, the negative pressure is reduced, allowing the electrolyte in the negative pressure cup to flow back into the battery cell, preventing excessive electrolyte loss and further expelling residual gas. This periodic switching effectively removes gas from the battery cell while preventing resource waste caused by excessively high negative pressure, achieving dynamic gas control that adapts to the actual gas production of the battery cell.

[0008] In an optional embodiment of the first aspect, after executing the target venting strategy on the target charging cell corresponding to the target negative pressure cup, the method further includes: obtaining the liquid level height of the target negative pressure cup; determining whether the liquid level height of the target negative pressure cup is higher than a second preset liquid level height; wherein the second preset liquid level height is lower than a first preset liquid level height; if it is determined that the liquid level height of the target negative pressure cup is higher than the second preset liquid level height, then executing the target venting strategy on the target charging cell corresponding to the target negative pressure cup again, until the liquid level height of the target negative pressure cup is no higher than the second preset liquid level height.

[0009] In the above-described implementation, a single venting operation may result in incomplete venting due to factors such as residual gas or insufficient electrolyte flow. Residual gas can still interfere with the formation of the SEI film, leading to problems such as lithium plating at the cell interface. This real-time method sets a second preset liquid level as the threshold for stopping venting. When the liquid level is not higher than the second preset liquid level, it indicates that venting is sufficient and there is no need to continue the venting strategy. When the liquid level is higher than the second preset liquid level, the venting strategy is executed again. Through secondary detection and cyclic venting, the excess gas in the target cell is completely removed until the liquid level drops to a reasonable range, fundamentally solving the problem of residual gas and further ensuring the stability of the SEI film and the electrochemical performance of the cell.

[0010] In an optional embodiment of the first aspect, the method further includes: if it is determined that the liquid level height of the target negative pressure cup is not higher than the second preset liquid level height, then controlling the target charging cell to resume charging, and adjusting the negative pressure ratio of the negative pressure regulating device to the initial negative pressure ratio.

[0011] In the above implementation method, this solution resumes cell charging in a timely manner after venting is completed and adjusts the negative pressure ratio to the initial negative pressure ratio. This avoids the prolonged formation cycle caused by a long pause in charging after venting, ensuring that the cell can continuously complete the formation process. It also promptly discharges the small amount of gas generated during the subsequent formation process of the cell to prevent gas from accumulating again, while maintaining a reasonable pressure difference to prevent excessive electrolyte loss.

[0012] In an optional embodiment of the first aspect, controlling the target charging cell to pause charging includes: sending a pause power supply signal to a power control device; wherein the power supply is electrically connected to each charging cell through the power control device, the pause power supply signal carries the cell identifier of the target charging cell, and the pause power supply signal is used to drive the power control device to control the target charging cell to pause charging.

[0013] In large-scale battery cell formation processes, multiple cells undergo formation simultaneously. Some cells may exhibit abnormal gas production while others remain normal. This implementation method can individually pause charging and venting for a single or small number of abnormal cells without affecting the formation of other normal cells. This adapts to scenarios involving large-scale, multi-cell simultaneous production, improving production flexibility. Furthermore, by including a cell identifier in the power supply pause signal, the power control equipment can accurately locate the target charging cell and cut off power only to that cell, while other cells continue charging normally. This avoids the reduced formation efficiency caused by traditional overall charging pauses, balancing the venting needs of the target cell with overall formation efficiency.

[0014] In an optional embodiment of the first aspect, controlling the target charging cell to pause charging includes: sending a pause power supply signal to the target power controller corresponding to the target charging cell; wherein there are multiple charging cells, the power supply is electrically connected to the multiple charging cells through multiple power controllers, each charging cell is connected to a power controller, and the pause power supply signal is used to drive the target power controller to control the target charging cell to pause charging.

[0015] In the above implementation scheme, each power controller is designed to be responsible for the power supply control of only one battery cell. When a battery cell experiences a charging interruption abnormality, the corresponding power controller can be directly located, which facilitates quick troubleshooting and reduces maintenance costs and difficulty.

[0016] Secondly, this application also provides a cell formation venting device, which includes a negative pressure regulating device, a detection and control device, and at least one negative pressure cup; one end of each negative pressure cup is connected to a charging cell through a negative pressure branch pipe, and the other end of each negative pressure cup is connected to the first end of the negative pressure regulating device, the second end of the negative pressure regulating device is used to access negative pressure, and the detection and control device is electrically connected to the negative pressure regulating device; the control device is used to detect the liquid level height of the corresponding negative pressure cup in real time; determine whether there is a target negative pressure cup with a liquid level height higher than a first preset liquid level height among the multiple negative pressure cups; if there is a target negative pressure cup with a liquid level height higher than the first preset liquid level height among the multiple negative pressure cups, then execute a target venting strategy on the target charging cell corresponding to the target negative pressure cup; wherein, the target venting strategy is: controlling the target charging cell to pause charging, and using a preset frequency to control the negative pressure ratio of the negative pressure regulating device to switch between an initial negative pressure ratio and an adjusted negative pressure ratio; the initial negative pressure ratio is used to drive the electrolyte to be drawn into the target negative pressure cup, and the adjusted negative pressure ratio drives the electrolyte to flow back to the target charging cell.

[0017] The battery cell formation venting equipment provided in this solution comprises only three core components: a negative pressure regulating device, a detection and control device, and a negative pressure cup. These components are connected via pipes or circuits, resulting in a simple connection method, compact layout, and flexible adjustment of the number of negative pressure cups according to battery cell production scale. This adapts to the needs of different scales of battery cell formation production and offers low manufacturing costs. Furthermore, this solution correlates the cumulative gas production during battery cell formation with the electrolyte level in the negative pressure cup. The detection and control device collects the real-time liquid level of each negative pressure cup. Since the gas generated during battery cell formation pushes the electrolyte through the negative pressure branch pipe into the negative pressure cup, the more gas produced, the more electrolyte enters the negative pressure cup, and the higher the liquid level. Therefore, the liquid level directly reflects the actual gas production rate and volume of the battery cell. The detection and control device compares the collected liquid level with a first preset liquid level to determine if any gas is present. The presence of a target negative pressure cup indicates abnormal gas production in the corresponding target charging cell. In this case, a target venting strategy must be implemented: first, pause charging of the target charging cell to prevent continuous gas production and further gas accumulation; then, switch the negative pressure regulating device between an initial negative pressure ratio and an adjusted negative pressure ratio using a preset frequency. During the initial negative pressure ratio stage, a larger negative pressure draws the electrolyte carrying unexpelled gas from the cell into the negative pressure cup, separating the gas from the electrolyte. During the adjusted negative pressure ratio stage, the negative pressure is reduced, allowing the electrolyte in the negative pressure cup to flow back to the cell, preventing excessive electrolyte loss and further venting residual gas from the negative pressure cup. This periodic switching effectively vents gas from the cell while preventing resource waste caused by excessively high negative pressure, achieving dynamic venting control adapted to the actual gas production of the cell.

[0018] In an optional embodiment of the second aspect, the detection and control device includes a detection device and a control device. The number of charging cells, negative pressure cups, and detection devices is one each, and the detection device is disposed inside the negative pressure cup. The cell formation and exhaust equipment also includes a negative pressure connecting pipe. One end of the negative pressure cup is connected to the charging cells through a negative pressure branch pipe, and the other end of the negative pressure cup is connected to the first end of the negative pressure regulating device through the negative pressure connecting pipe. The negative pressure regulating device is electrically connected to the control device.

[0019] The above-described implementation method simplifies the equipment structure for single-cell formation scenarios, requiring only one negative pressure cup and one detection device. This reduces the number of components and pipe connections, lowering the manufacturing cost and installation difficulty of the equipment. Simultaneously, the detection device is directly installed inside the negative pressure cup, allowing for direct collection of liquid level data. This avoids errors caused by external detection (such as pipe blockage or environmental interference), resulting in higher liquid level detection accuracy. Consequently, the control device's judgment becomes more accurate, the venting strategy is executed more reliably, and the formation quality of a single cell is improved.

[0020] In an optional embodiment of the second aspect, the detection and control device includes a detection device and a control device. The number of charging cells, negative pressure cups and detection devices are the same and there are multiple of them. Each negative pressure cup is provided with a detection device. The cell formation and degassing device also includes a busbar. One end of each negative pressure cup is connected to a target cell through a negative pressure branch pipe. The other end of each negative pressure cup is connected to the first end of the busbar. The second end of the busbar is connected to the first end of the negative pressure regulating device.

[0021] In the above-described implementation, this solution achieves centralized connection of multiple negative pressure cups and negative pressure regulating devices through a busbar, enabling simultaneous formation and venting of multiple battery cells. This eliminates the need for a separate negative pressure regulating device for each cell, significantly improving the production efficiency of large-scale battery cell formation and meeting the demands of industrial mass production. Simultaneously, the busbar evenly distributes negative pressure to each negative pressure cup, avoiding the negative pressure differences caused by individual connections of multiple cups to negative pressure regulating devices. This ensures consistent venting conditions for each battery cell, resulting in consistent SEI film formation quality for each cell, improving the quality consistency of batched battery cells, and reducing performance variations.

[0022] In an optional embodiment of the second aspect, the cell formation venting device further includes a power supply and a power control device; the power supply is electrically connected to each charging cell through the power control device, and the power control device is electrically connected to a control device; the control device is used to send a power supply pause signal to the power control device; wherein the power supply pause signal carries a cell identifier of the target charging cell; the power control device is used to control the target charging cell to pause charging in response to the power supply pause signal.

[0023] In the above-described implementation, the device integrates a power supply and power control equipment, eliminating the need for external power supply and control equipment. The detection and control device can directly control the pause and resumption of charging, achieving integrated exhaust control and charging control. This simplifies equipment connection and operation procedures, improving operator convenience. Simultaneously, precise positioning of target cells via cell identification avoids misoperation, resulting in faster and more accurate response times for pause charging control, further ensuring effective exhaust and high-quality cell formation.

[0024] Thirdly, this application also provides a cell formation and exhaust system, which includes at least one charging cell, a negative pressure generating device, and the cell formation and exhaust device described in any optional embodiment of the second aspect, wherein each charging cell is connected to a negative pressure cup through a negative pressure branch pipe, and the negative pressure generating device is connected to the second end of a negative pressure regulating device.

[0025] The cell formation venting system provided in this solution, since it includes the cell formation generating equipment described above, can correlate the cumulative amount of gas produced during cell formation with the electrolyte level in the negative pressure cup. The system uses a detection and control device to collect the liquid level in each negative pressure cup in real time. Because the gas generated during cell formation pushes the electrolyte through the negative pressure branch pipe into the negative pressure cup, the more gas produced, the more electrolyte enters the negative pressure cup, and the higher the liquid level. Therefore, the liquid level directly maps to the actual gas production rate and amount of the cell. The detection and control device compares the collected liquid level with a first preset liquid level to determine if there is a target negative pressure cup with excessive gas production. When a target negative pressure cup exists, it indicates that the corresponding target charging cell has abnormal gas production. Normally, at this point, a target venting strategy needs to be implemented: First, control the target charging cell to pause charging to avoid continuous gas production during charging, which would exacerbate gas accumulation. Then, control the negative pressure regulating device to switch between the initial negative pressure ratio and the adjusted negative pressure ratio via a preset frequency. In the initial negative pressure ratio stage, a larger negative pressure is used to draw the electrolyte carrying the unvented gas in the cell into the negative pressure cup, achieving gas-electrolyte separation. In the adjusted negative pressure ratio stage, the negative pressure is reduced, allowing the electrolyte in the negative pressure cup to flow back to the cell, preventing excessive electrolyte loss. At the same time, residual gas in the negative pressure cup is further vented. Through this periodic switching, the gas in the cell can be fully vented, while avoiding resource waste caused by excessively high negative pressure. This achieves dynamic venting control adapted to the actual gas production of the cell. Simultaneously, the negative pressure generating device provides a stable negative pressure source for the system, ensuring that the negative pressure regulating device can accurately adjust the negative pressure ratio, avoiding problems such as insufficient venting and excessive electrolyte loss due to unstable negative pressure. This further improves the venting effect, ensures the quality of SEI film formation, and enhances cell quality.

[0026] Fourthly, the present invention provides an electronic device including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to perform the method described in the first aspect and any optional embodiment of the first aspect.

[0027] Fifthly, the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, performs the method described in the first aspect or any optional embodiment of the first aspect.

[0028] In a sixth aspect, the present invention provides a computer program product, including a computer program / instructions, which, when executed by a processor, perform the method described in the first aspect or any optional embodiment of the first aspect.

[0029] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a first structural schematic diagram of the cell formation exhaust device provided in an embodiment of this application; Figure 2 This is a second structural schematic diagram of the cell formation exhaust device provided in an embodiment of this application; Figure 3 This is a schematic diagram of the third structure of the cell formation exhaust device provided in an embodiment of this application; Figure 4 This is a fourth structural schematic diagram of the cell formation exhaust device provided in an embodiment of this application; Figure 5 This is a schematic diagram of the structure of the cell formation and exhaust system provided in an embodiment of this application; Figure 6 This is a first process diagram of the cell formation and degassing method provided in an embodiment of this application; Figure 7 This is a schematic diagram of the second process of the cell formation and degassing method provided in an embodiment of this application; Figure 8 This is a schematic diagram of the structure of the cell formation degassing device provided in an embodiment of this application; Figure 9 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application.

[0032] Icons: A-Charging cell; B-Negative pressure generating device; G1-Negative pressure branch pipe; G2-Negative pressure connecting pipe; G3-Busbar; 10-Negative pressure regulating device; 20-Detection and control device; 210-Detection device; 220-Control device; 30-Negative pressure cup; 50-Power supply; 60-Power supply control device; 800-Real-time acquisition module; 810-Judgment module; 820-Execution module; 9-Electronic equipment; 901-Processor; 902-Memory; 903-Communication bus. Detailed Implementation

[0033] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0035] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0036] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0037] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0038] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0039] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0040] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0041] Formation is the initial charging process of a lithium-ion battery cell during manufacturing. It involves forming a stable SEI film (solid electrolyte membrane) on the surface of the cell's negative electrode, and is the most crucial step in activating the cell. Gases are generated during formation, and failure to promptly remove these gases can affect the quality of the formed film, leading to problems such as lithium plating at the cell interface and capacity reduction, thus impacting cell quality.

[0042] Currently, common cell formation and degassing methods include segmented formation and function-based segmented adjustment. Segmented formation refers to dividing the entire cell formation process into multiple segments, such as using a small current and high negative pressure in the early stage and a large current and low negative pressure in the later stage to remove formation gases in time. Function-based segmented adjustment refers to obtaining the cell's SOC-gas production curve through preliminary experiments and processing it to obtain the SOC-negative pressure relationship curve. During the formation process, different negative pressures are set according to different SOCs.

[0043] Based on the current common formation and degassing methods, it is known that they rely on a preset fixed negative pressure strategy (such as segmented formation, function segmented adjustment, etc.), which cannot be dynamically adjusted according to the actual gas production of the cell. That is, too low negative pressure leads to insufficient gas discharge, or too high negative pressure leads to resource waste, affecting the quality of the SEI film and the performance of the cell.

[0044] To address the aforementioned issues, this application designs a cell formation venting method, device, and system. It correlates the cumulative gas production during cell formation with the electrolyte level in the negative pressure cup. A detection and control device collects the liquid level of each negative pressure cup in real time. Since the gas generated during cell formation pushes the electrolyte through the negative pressure branch pipe into the negative pressure cup, the more gas produced, the more electrolyte enters the negative pressure cup, and the higher the liquid level. Therefore, the liquid level directly maps to the actual gas production rate and amount of the cell. The detection and control device compares the collected liquid level with a first preset liquid level to determine if there is a target negative pressure cup with excessive gas production. When a target negative pressure cup exists, it indicates abnormal gas production in the corresponding target charging cell, and target venting must be performed. Strategy: First, control the target charging cell to pause charging to avoid continuous gas production during charging, which would exacerbate gas accumulation. Then, control the negative pressure regulating device to switch between the initial negative pressure ratio and the adjusted negative pressure ratio through a preset frequency. In the initial negative pressure ratio stage, a larger negative pressure is used to draw the electrolyte carrying the unexpelled gas in the cell into the negative pressure cup, achieving separation of gas and electrolyte. In the adjusted negative pressure ratio stage, the negative pressure is reduced, allowing the electrolyte in the negative pressure cup to flow back to the cell, preventing excessive electrolyte loss, and further expelling the residual gas in the negative pressure cup. Through this periodic switching, the gas in the cell can be fully expelled, while preventing resource waste caused by excessively high negative pressure, achieving dynamic gas exhaust control adapted to the actual gas production of the cell.

[0045] Based on the above ideas, this application first provides a cell formation venting device, such as... Figure 1 As shown, the battery cell formation and exhaust equipment includes a negative pressure regulating device 10, a detection and control device 20, and at least one negative pressure cup 30. One end of each negative pressure cup 30 is connected to a charging battery cell A through a negative pressure branch pipe G1. The other end of each negative pressure cup 30 is connected to the first end of the negative pressure regulating device 10. The second end of the negative pressure regulating device 10 is used to access negative pressure. The detection and control device 20 is electrically connected to the negative pressure regulating device 10.

[0046] The negative pressure regulating device 10 is connected to a negative pressure source and can adjust the proportion of negative pressure input, thereby controlling the pressure difference between the negative pressure cup and the battery cell to achieve electrolyte intake and reflux. It is the core actuator for implementing the exhaust strategy. Specifically, it can be a proportional negative pressure regulating valve, an electromagnetic proportional valve, or a servo control valve. It can be paired with a pressure sensor to achieve closed-loop regulation. The proportional negative pressure regulating valve controls the negative pressure input proportion by adjusting the valve core opening; the electromagnetic proportional valve precisely adjusts the negative pressure output proportion through an electrical signal; and the servo control valve can achieve higher precision negative pressure ratio switching control, adapting to preset frequency switching requirements.

[0047] The detection and control device 20 indicates that it has data acquisition, logic judgment and command sending functions, is electrically connected to the negative pressure regulating device, and is a data processing and control component responsible for real-time acquisition of liquid level data, judgment of gas production status and execution of target exhaust strategy.

[0048] The negative pressure cup 30 represents a cavity that temporarily stores the electrolyte (carrying the gas generated during formation) drawn from the battery cell. One end is connected to the charging battery cell via a negative pressure branch pipe, and the other end is connected to a negative pressure regulating device. It is a key carrier reflecting the gas production status of the battery cell, and its liquid level is positively correlated with the amount of gas produced by the battery cell. Specific forms can include a sealed transparent quartz cavity, a corrosion-resistant plastic cavity (such as a PTFE cavity), or a stainless steel cavity, or a negative pressure cup, etc. A flow guiding structure can be set at the bottom of the cavity, and an exhaust port is reserved at the top for connection with the negative pressure regulating device 10.

[0049] In the above-designed cell formation venting device, when the negative pressure regulating device 10 is connected to the negative pressure using the initial negative pressure ratio, the surface of the charging cell A will deform under atmospheric pressure due to the negative pressure effect of the initial negative pressure ratio, thereby reducing the internal space. When the gas generated during formation is not extracted in time by the negative pressure, it will accumulate inside the charging cell A, occupying a certain space. The combined effect of the two causes the electrolyte inside the charging cell A to be temporarily stored in the negative pressure cup 30. When the gas generation inside the charging cell A is intense and the gas is not extracted in time and accumulates inside the charging cell A, the liquid level rises.

[0050] Based on the correlation between the cumulative amount of gas generated during cell formation and the electrolyte level in the negative pressure cup, the detection and control device 20 designed in this scheme can monitor the liquid level of each negative pressure cup 30 in real time and determine whether there is a target negative pressure cup with a liquid level higher than the first preset liquid level. When a target negative pressure cup exists, it indicates that the target charging cell connected to the target negative pressure cup is generating too much gas. The detection and control device immediately executes the target venting strategy: first, it controls the target charging cell to pause charging to avoid continuous gas generation during charging, which would exacerbate gas accumulation; then, it controls the negative pressure regulating device at a preset frequency to initially... Switching between the initial negative pressure ratio and the adjusted negative pressure ratio allows for the following process: In the initial negative pressure ratio stage, a larger negative pressure is used to draw the electrolyte carrying unexpelled gas from the battery cell into the negative pressure cup, achieving separation of gas and electrolyte; In the adjusted negative pressure ratio stage, the negative pressure is reduced, allowing the electrolyte in the negative pressure cup to flow back to the battery cell, preventing excessive electrolyte loss, and further expelling residual gas from the negative pressure cup. Through this periodic switching, gas in the battery cell can be fully expelled, while preventing resource waste caused by excessively high negative pressure, achieving dynamic exhaust control that adapts to the actual gas production of the battery cell.

[0051] The cell formation venting equipment provided in this solution comprises only three core components: a negative pressure regulating device, a detection and control device, and a negative pressure cup. These components are connected via pipes or circuits, resulting in a simple connection method, compact layout, and flexible adjustment of the number of negative pressure cups according to the scale of cell production. This adapts to the needs of different scales of cell formation production and offers low manufacturing costs. Furthermore, this solution correlates the cumulative gas production during cell formation with the electrolyte level in the negative pressure cup. The detection and control device collects the real-time liquid level of each negative pressure cup. Since the gas generated during cell formation pushes the electrolyte through the negative pressure branch pipe into the negative pressure cup, the more gas produced, the more electrolyte enters the cup, and the higher the liquid level. Therefore, the liquid level directly reflects the actual gas production rate and volume of the cell. The detection and control device compares the collected liquid level with a first preset liquid level to determine if any gas is present. Excessive gas production in the target negative pressure cup indicates abnormal gas production in the corresponding target charging cell. In this case, a target venting strategy must be implemented: First, control the target charging cell to pause charging to prevent continuous gas production during charging, which would exacerbate gas accumulation. Then, control the negative pressure regulating device to switch between the initial negative pressure ratio and the adjusted negative pressure ratio via a preset frequency. During the initial negative pressure ratio stage, a larger negative pressure is used to draw the electrolyte carrying unexpelled gas from the cell into the negative pressure cup, achieving gas-electrolyte separation. During the adjusted negative pressure ratio stage, the negative pressure is reduced, allowing the electrolyte in the negative pressure cup to flow back to the cell, preventing excessive electrolyte loss. Simultaneously, residual gas in the negative pressure cup is further vented. This periodic switching effectively vents the gas from the cell while preventing electrolyte loss due to excessive venting, achieving dynamic venting control adapted to the actual gas production of the cell.

[0052] In an optional implementation of this embodiment, such as Figure 2 As shown, the detection and control device 20 designed in this scheme may include a detection device 210 and a control device 220. The number of charging cell A, negative pressure cup 30 and detection device 210 are all one. The detection device 210 is set in the negative pressure cup 30. The cell formation and exhaust equipment also includes a negative pressure connecting pipe G2. One end of the negative pressure cup 30 is connected to the charging cell A through a negative pressure branch pipe G1. The other end of the negative pressure cup 30 is connected to the first end of the negative pressure regulating device 10 through the negative pressure connecting pipe G2. The negative pressure regulating device 10 is electrically connected to the control device 220. The detection device 210 is electrically connected to the control device 220.

[0053] The detection device 210 can be a contact level sensor (such as a float level sensor or a capacitive level sensor) or a non-contact level sensor (such as an ultrasonic level sensor or an infrared level sensor), and is installed inside the negative pressure cup to directly and accurately collect level data.

[0054] The control device 220 can be a PLC controller, a microcontroller (such as an STM32 series microcontroller) or an industrial control computer. It has a built-in data processing module and an instruction sending module, which can realize real-time analysis of liquid level data and accurate output of control instructions.

[0055] Negative pressure connecting pipe G2 refers to the pipe connecting negative pressure cup 30 and negative pressure regulating device 10. It is used to transmit negative pressure and transport electrolyte. When negative pressure cup 30 is a single unit, the negative pressure cup 30 and negative pressure regulating device 10 are connected individually through this pipe.

[0056] In the above embodiment, the charging cell A is connected to negative pressure through the negative pressure branch pipe G1, the negative pressure cup 30, and the negative pressure connecting pipe G2. The detection device 210 collects the liquid level height in the negative pressure cup 30 in real time and transmits the data to the control device 220. The control device 220 compares the liquid level height with the first preset liquid level height to determine whether the negative pressure cup is the target negative pressure cup. If it is the target negative pressure cup, the control device executes the aforementioned target venting strategy to vent the charging cell A.

[0057] The above-described implementation scheme simplifies the equipment structure for single-cell formation scenarios, requiring only one negative pressure cup and one detection device. This reduces the number of components and pipe connections, lowering manufacturing costs and installation difficulty. Simultaneously, the detection device is directly installed inside the negative pressure cup, allowing for direct collection of liquid level data. This avoids errors caused by external detection (such as pipe blockage or environmental interference), resulting in higher liquid level detection accuracy. Consequently, the control device's judgment becomes more accurate, the venting strategy is executed more reliably, and the formation quality of individual cells is improved.

[0058] In optional embodiments of this example, in multiple cell formation scenarios, such as Figure 3 As shown, the number of charging cells A, negative pressure cups 30, and detection devices 210 in this design are the same and there are multiple of them. Each negative pressure cup 30 is equipped with a detection device 210. Each detection device 210 is electrically connected to the control device 220. The cell formation and exhaust equipment also includes a busbar G3. One end of each negative pressure cup 30 is connected to a charging cell through a negative pressure branch pipe G1. The other end of each negative pressure cup 30 is connected to the first end of the busbar G3. The second end of the busbar G3 is connected to the first end of the negative pressure regulating device 10.

[0059] In the above implementation scheme, each detection device 210 is designed to collect the liquid level height in the corresponding negative pressure cup 30 in real time and transmit the data to the control device 220. The control device 220 judges the liquid level height of each negative pressure cup 30 one by one and selects the target negative pressure cup and the corresponding target charging cell whose liquid level is higher than the first preset liquid level height. For each target charging cell, the control device 220 executes the above-mentioned target venting strategy to vent the target charging cell. Among them, the configuration of the manifold G3 allows multiple negative pressure cups 30 to share a single negative pressure regulating device 10, realizing centralized venting control, while ensuring the stability of the negative pressure in each negative pressure cup 30 and avoiding the problem of uneven negative pressure caused by excessively long pipes and too many branches.

[0060] In the implementation of the above design, this solution achieves centralized connection of multiple negative pressure cups and negative pressure regulating devices through a busbar, enabling simultaneous formation and venting of multiple battery cells. This eliminates the need for a separate negative pressure regulating device for each cell, significantly improving the production efficiency of large-scale battery cell formation and meeting the demands of industrial mass production. Simultaneously, the busbar evenly distributes negative pressure to each negative pressure cup, avoiding the negative pressure differences caused by individual connections of multiple cups to negative pressure regulating devices. This ensures consistent venting conditions for each battery cell, resulting in consistent SEI film formation quality for each cell, improving the quality consistency of batched battery cells, and reducing performance variations.

[0061] In an optional implementation of this embodiment, such as Figure 4 As shown, the cell formation and exhaust equipment designed in this scheme also includes a power supply 50 and a power control device 60. The power supply 50 is electrically connected to each charging cell A through the power control device 60, and the power control device 60 is electrically connected to the control device 220.

[0062] In the above embodiment, when the control device 220 determines that the target negative pressure cup and the corresponding target charging cell need to be paused for charging, the control device 220 generates a pause power supply signal. The pause power supply signal carries the cell identifier of the target charging cell and sends the pause power supply signal to the power control device 60.

[0063] After receiving the signal, the power control device 60 analyzes the cell identifier, accurately identifies the target charging cell, and then cuts off the power supply 50 to the target cell, thus pausing the charging of the target charging cell. After the venting is completed, the control device 220 sends a power supply restoration signal, and the power control device 60 restores the power supply to the target cell, ensuring that the formation process continues.

[0064] In the above-described implementation, this solution integrates a power supply and power control device, eliminating the need for external power supply and control equipment. The detection and control device can directly control the pause and resumption of charging, achieving integrated exhaust control and charging control. This simplifies equipment connection and operation procedures, improving operator convenience. Simultaneously, precise positioning of target cells via cell identification avoids misoperation, resulting in faster and more accurate response times for pause charging control, further ensuring effective exhaust and high-quality cell formation.

[0065] This application also provides a cell formation venting system, such as Figure 5 As shown, the cell formation and degassing system includes at least one charging cell A, a negative pressure generating device B, and a cell formation and degassing device according to any of the optional embodiments described above. Each charging cell A is connected to a negative pressure cup 30 via a negative pressure branch pipe G1, and the negative pressure generating device B is connected to the second end of the negative pressure regulating device 10. Specifically, the negative pressure generating device B designed in this scheme can be a vacuum machine.

[0066] The cell formation and venting system designed above uses a negative pressure generating device B to continuously generate negative pressure, providing venting power for the entire system. During the formation process of the charging cell A, the generated gas pushes the electrolyte through the negative pressure branch pipe G1 into the corresponding negative pressure cup 30. The detection and control device 20 of the cell formation and venting equipment detects the liquid level height of each negative pressure cup to determine if a target negative pressure cup exists. If so, a target venting strategy is executed: first, the target charging cell is paused to prevent continuous gas generation during charging, which could exacerbate gas accumulation; then, the negative pressure regulating device is controlled at a preset frequency to maintain the initial... Switching between the negative pressure ratio and the adjusted negative pressure ratio allows for the following process: In the initial negative pressure ratio stage, a larger negative pressure is used to draw the electrolyte carrying unexpelled gas from the battery cell into the negative pressure cup, achieving gas-electrolyte separation; In the adjusted negative pressure ratio stage, the negative pressure is reduced, allowing the electrolyte in the negative pressure cup to flow back to the battery cell, preventing excessive electrolyte loss, and further expelling residual gas from the negative pressure cup. Through this periodic switching, the gas in the battery cell can be fully expelled, while preventing electrolyte loss due to excessive gas extraction, achieving dynamic exhaust control that adapts to the actual gas production of the battery cell.

[0067] The cell formation venting system provided in this solution, because it includes the cell formation generating equipment described above, can correlate the cumulative amount of gas produced during cell formation with the electrolyte level in the negative pressure cup. The system uses a detection and control device to collect the liquid level in each negative pressure cup in real time. Since the gas generated during cell formation pushes the electrolyte through the negative pressure branch pipe into the negative pressure cup, the more gas produced, the more electrolyte enters the negative pressure cup, and the higher the liquid level. Therefore, the liquid level directly maps to the actual gas production rate and amount of the cell. The detection and control device compares the collected liquid level with a first preset liquid level to determine if there is a target negative pressure cup with excessive gas production. When a target negative pressure cup exists, it indicates abnormal gas production in the corresponding target charging cell. At this point, a target venting strategy needs to be implemented: First, control the target charging cell to pause charging to avoid continuous gas production during charging, which would exacerbate gas accumulation. Then, control the negative pressure regulating device to switch between the initial negative pressure ratio and the adjusted negative pressure ratio via a preset frequency. In the initial negative pressure ratio stage, a larger negative pressure is used to draw the electrolyte carrying the unvented gas in the cell into the negative pressure cup, achieving gas-electrolyte separation. In the adjusted negative pressure ratio stage, the negative pressure is reduced, allowing the electrolyte in the negative pressure cup to flow back to the cell, preventing excessive electrolyte loss. At the same time, residual gas in the negative pressure cup is further vented. Through this periodic switching, the gas in the cell can be fully vented while preventing resource waste caused by excessively high negative pressure, achieving venting control that dynamically adapts to the actual gas production of the cell. Simultaneously, the negative pressure generating device provides a stable negative pressure source for the system, ensuring that the negative pressure regulating device can accurately adjust the negative pressure ratio, avoiding problems such as insufficient venting and excessive electrolyte loss due to unstable negative pressure, further improving the venting effect, ensuring the quality of SEI film formation, and improving cell quality.

[0068] This application also provides a cell formation degassing method, which is applied to the cell formation degassing equipment described above, and can be executed by the detection and control device described above, such as... Figure 6 As shown, the cell formation and degassing method can be implemented in the following ways: Step S600: Obtain the liquid level height of each negative pressure cup in real time.

[0069] Step S610: Determine whether there is a target negative pressure cup among the multiple negative pressure cups whose liquid level is higher than the first preset liquid level. If so, proceed to step S320.

[0070] Step S620: Execute the target exhaust strategy for the target charging cell corresponding to the target negative pressure cup.

[0071] In the above embodiments, the charging cell needs to be charged to achieve formation, that is, the initial state of the charging cell in this solution is the charging state; the liquid in the negative pressure cup is the electrolyte in the charging cell connected to the negative pressure cup. Specifically, when the negative pressure regulating device is connected to the negative pressure using the initial negative pressure ratio, due to the negative pressure effect of the initial negative pressure ratio, the surface of the charging cell will deform under atmospheric pressure, thereby reducing the internal space. When the gas generated during formation is not extracted by the negative pressure in time, it will accumulate inside the charging cell, occupying a certain space. The combined effect of the two causes the electrolyte inside the charging cell to be drawn into the negative pressure cup for temporary storage. When the gas generation inside the charging cell is intense and the gas is not extracted in time and accumulates inside the charging cell, the liquid level rises.

[0072] The initial negative pressure ratio represents the preset initial adjustment ratio of the negative pressure adjustment device. A larger effective negative pressure can generate a sufficient pressure difference to drive the electrolyte in the battery cell into the negative pressure cup, thereby achieving the initial separation of gas and electrolyte.

[0073] Based on the above principles, for step S600, as a possible implementation, this solution can acquire the liquid level height of each negative pressure cup in real time when the negative pressure regulating device is connected to negative pressure and the charging cell is charging. At this time, the cell is in the formation and gas production state, and the initial liquid level already exists in the negative pressure cup due to the negative pressure. The change in liquid level height can reflect the current gas production rate and gas production of the cell in real time and accurately, and can quickly detect abnormal gas production of the cell, providing accurate data support for timely activation of the target exhaust strategy; at the same time, it can check in advance whether there are leaks or abnormal liquid levels in the negative pressure cup, avoiding the waste of detection resources caused by early equipment malfunctions.

[0074] As another possible implementation, this solution can also start real-time data acquisition when the negative pressure regulating device is not connected to negative pressure and the charging cell is not charging, thereby avoiding insufficient detection timeliness caused by the subsequent connection of the negative pressure regulating device to negative pressure and the drastic change in liquid level height when the charging cell is charging.

[0075] The liquid level in each negative pressure cup can be detected, as described above, using a detection device installed inside the cup. Specifically, this detection device can be a liquid level sensor, an infrared sensor, or the like.

[0076] This solution detects the liquid level in each negative pressure cup using the method described above. Then, it determines whether there is a target negative pressure cup with a liquid level higher than a first preset liquid level. The first preset liquid level represents a pre-set threshold for the negative pressure cup's liquid level. When the liquid level exceeds this threshold, it indicates abnormal gas production in the battery cell, requiring the activation of a target venting strategy. This first preset liquid level can be determined based on the battery cell model, formation process parameters, or empirical and experimental values.

[0077] Specifically, as one possible implementation, when there is only one charging cell and one negative pressure cup, this solution can directly compare the liquid level of the negative pressure cup with the first preset liquid level to determine whether the liquid level of the negative pressure cup is higher than the first preset liquid level. If the liquid level of the negative pressure cup is higher than the first preset liquid level, then the negative pressure cup is determined to be the target negative pressure cup.

[0078] As another possible implementation, when there are multiple charging cells and multiple negative pressure cups, this solution can compare the liquid level of each negative pressure cup with the first preset liquid level. If the liquid level of a negative pressure cup is higher than the first preset liquid level, then the negative pressure cup is determined as the target negative pressure cup.

[0079] It should be noted that this scheme compares the liquid level of each negative pressure cup with the first preset liquid level in either a polling-based sequential comparison or a multi-channel simultaneous comparison. Furthermore, the number of target negative pressure cups identified in this scheme is not limited to one. When there are multiple target negative pressure cups, this scheme executes step S620 for each target negative pressure cup.

[0080] For step S620, the target exhaust strategy designed in this scheme is as follows: The detection and control device first controls the target charging cell to pause charging to avoid continuous gas production during charging, which would exacerbate gas accumulation; the detection and control device then controls the negative pressure regulating device to switch between the initial negative pressure ratio and the adjusted negative pressure ratio through a preset frequency. The adjusted negative pressure ratio is greater than the initial negative pressure ratio, which corresponds to a smaller effective negative pressure (for example, it can be atmospheric pressure), which can reduce the pressure difference between the negative pressure cup and the charging cell, and even form reverse pressure to drive the electrolyte in the negative pressure cup to flow back to the charging cell, thus avoiding excessive electrolyte loss.

[0081] Based on the aforementioned target exhaust strategy, during the initial negative pressure ratio stage, a larger negative pressure is used to draw the electrolyte carrying the unexhausted gas inside the cell into the negative pressure cup, achieving separation of gas and electrolyte. During the negative pressure ratio adjustment stage, the negative pressure is reduced, allowing the electrolyte in the negative pressure cup to flow back to the cell, preventing excessive electrolyte loss. At the same time, the residual gas in the negative pressure cup is further exhausted. Through this periodic switching, the gas inside the cell can be fully exhausted, while preventing electrolyte loss caused by excessive gas extraction, achieving exhaust control that dynamically adapts to the actual gas production of the cell.

[0082] The cell formation venting method provided in this solution correlates the cumulative gas production during cell formation with the electrolyte level in the negative pressure cup. A detection and control device collects the liquid level of each negative pressure cup in real time. Since the gas generated during cell formation pushes the electrolyte through the negative pressure branch pipe into the negative pressure cup, the more gas produced, the more electrolyte enters the negative pressure cup, and the higher the liquid level. Therefore, the liquid level directly maps to the actual gas production rate and amount of the cell. The detection and control device compares the collected liquid level with a first preset liquid level to determine if there is a target negative pressure cup with excessive gas production. When a target negative pressure cup exists, it indicates abnormal gas production in the corresponding target charging cell. In this case, a target venting strategy needs to be implemented: first, control the target... The charging process pauses when the battery cell is charging to prevent continuous gas production and accumulation during charging. A preset frequency control device switches between an initial negative pressure ratio and an adjusted negative pressure ratio. In the initial negative pressure phase, a higher negative pressure draws the electrolyte carrying unexpelled gas from the battery cell into a negative pressure cup, separating the gas from the electrolyte. In the adjusted negative pressure phase, the negative pressure is reduced, allowing the electrolyte in the negative pressure cup to flow back into the battery cell, preventing excessive electrolyte loss and further expelling residual gas. This periodic switching effectively removes gas from the battery cell while preventing resource waste caused by excessively high negative pressure, achieving dynamic gas control that adapts to the actual gas production of the battery cell.

[0083] In an optional embodiment of this example, after executing step S620 to apply the target venting strategy to the target charging cell corresponding to the target negative pressure cup, as follows: Figure 7 As shown, this solution can also perform closed-loop monitoring of the target exhaust strategy's execution effect in the following ways to ensure thorough exhaust and avoid gas residue caused by insufficient exhaust in a single operation: Step S700: Obtain the liquid level height of the target negative pressure cup.

[0084] Step S710: Determine whether the liquid level of the target negative pressure cup is higher than the second preset liquid level. If yes, return to step S620 again; otherwise, proceed to step S720.

[0085] Step S720: Control the target charging cell to resume charging, and adjust the negative pressure ratio of the negative pressure regulating device to the initial negative pressure ratio.

[0086] In the above implementation, after the target venting strategy is executed once on the target charging cell corresponding to the target negative pressure cup, the detection and control device acquires the liquid level height of the target negative pressure cup again. The venting effect is judged by the change in liquid level height. The liquid level height acquired again is compared with the second preset liquid level height. Since the second preset liquid level height is less than the first preset liquid level height, it corresponds to the reasonable liquid level range when the cell is producing gas normally. If the liquid level height of the target negative pressure cup is still higher than the second preset liquid level height, it means that there is still a lot of gas in the target cell that has not been vented. The single venting has not achieved the expected effect, and the target venting strategy needs to be repeated until the liquid level height of the target negative pressure cup is no higher than the second preset liquid level height.

[0087] If the liquid level is not higher than the second preset liquid level height, it indicates that the venting is sufficient and there is no need to continue venting. In this case, this solution controls the target charging cell to resume charging and adjusts the negative pressure ratio of the negative pressure regulating device to restore it to the initial negative pressure ratio.

[0088] By implementing the above-mentioned venting strategy, re-detecting the liquid level, and determining whether to perform secondary venting, a closed-loop control of the venting effect is formed until the liquid level drops below the second preset liquid level height. This ensures that excess gas in the target cell is completely vented, avoiding the impact of residual gas on SEI film formation and cell performance.

[0089] The above-described implementation method provided in this solution may result in incomplete venting due to factors such as residual gas and insufficient electrolyte flow during a single venting operation. Residual gas can still interfere with the formation of the SEI film, leading to problems such as lithium plating at the cell interface. This real-time method sets a second preset liquid level height as the threshold for stopping venting. When the liquid level is not higher than the second preset liquid level height, it indicates that venting is sufficient and there is no need to continue the venting strategy. When the liquid level is higher than the second preset liquid level height, the venting strategy is executed again. Through secondary detection and cyclic venting, the liquid level is reduced to a reasonable range, ensuring that excess gas in the target cell is completely removed, fundamentally solving the problem of residual gas, and further ensuring the stability of the SEI film and the electrochemical performance of the cell. At the same time, this solution promptly resumes cell charging and adjusts the negative pressure ratio to the initial negative pressure ratio after venting is completed. This avoids the prolonged formation cycle caused by prolonged charging pauses after venting, ensuring that the cell can continuously complete the formation process. It also promptly removes the small amount of gas generated during the subsequent cell formation process to prevent gas from accumulating again, while maintaining a reasonable pressure difference to prevent excessive electrolyte loss.

[0090] In an optional embodiment of this example, for the charging control of the target charging cell, as one possible implementation, this solution can send a pause power supply signal to the power control device.

[0091] In the above embodiments, the power supply pause signal represents an instruction signal sent by the detection and control device to the power control device, which can be used to instruct the power control device to stop supplying power to the target charging cell.

[0092] Specifically, the power supply is electrically connected to all charging cells through a power control device. The power control device can control the power supply status of all charging cells. Each charging cell has a unique cell identifier. The unique cell identifier can be used to identify the corresponding cell among multiple cells. When the detection and control device of this solution identifies a target charging cell whose liquid level is higher than the first preset liquid level, it can obtain the cell identifier of the target charging cell and then package the cell identifier of the target charging cell in the power supply pause signal. In this way, the power control device can accurately find the target charging cell that needs to be stopped from supplying power among multiple charging cells based on the cell identifier of the target charging cell in the power supply pause signal, and then stop supplying power to the target charging cell.

[0093] In large-scale battery cell formation processes, multiple cells undergo formation simultaneously. Some cells may exhibit abnormal gas production while others remain normal. This implementation method can individually pause charging and venting for a single or small number of abnormal cells without affecting the formation of other normal cells. This adapts to scenarios involving large-scale, multi-cell simultaneous production, improving production flexibility. Furthermore, by including a cell identifier in the power supply pause signal, the power control equipment can accurately locate the target charging cell and cut off power only to that cell, while other cells continue charging normally. This avoids the reduced formation efficiency caused by traditional overall charging pauses, balancing the venting needs of the target cell with overall formation efficiency.

[0094] In an optional implementation of this embodiment, as another possible implementation method for charging control of the target charging cell, this solution can send a pause power supply signal to the target power controller corresponding to the target charging cell.

[0095] In the above embodiments, there are multiple charging cells, and the power supply is electrically connected to multiple charging cells through multiple power controllers. Each charging cell is connected to one power controller, that is, each power controller controls the power supply of only one charging cell. The detection and control device can establish an electrical connection with each power controller individually to realize one-to-one command transmission.

[0096] When the detection and control device needs to pause charging of a target charging cell, it directly sends a pause power supply signal to the target power controller corresponding to that target charging cell. Since the detection and control device is connected one-to-one with each power controller, it does not need to carry a cell identifier. After receiving the pause power supply signal, the target power controller immediately cuts off the power supply circuit between the target charging cell it controls and the power source, thus pausing charging of the target charging cell. The power controllers corresponding to other charging cells do not receive a pause signal and continue to supply power normally, allowing the corresponding cells to proceed with the formation process normally.

[0097] In the above-described implementation scheme, each power controller is designed to be responsible for the power supply control of only one battery cell. When a battery cell experiences a charging interruption abnormality, the corresponding power controller can be directly located, which facilitates quick troubleshooting and reduces maintenance costs and difficulties.

[0098] Figure 8 A schematic structural block diagram of a cell formation venting device provided in this application is presented. It should be understood that this device is disposed within the cell formation venting equipment described above, and this device is related to... Figure 6 and Figure 7 The method embodiment executed by the detection and control device corresponds to the method described above, and it is capable of performing the steps involved in the aforementioned method. The specific functions of the device can be found in the description above, and detailed descriptions are omitted here to avoid repetition. The device includes at least one software function module that can be stored in memory or embedded in the device's operating system (OS) in the form of software or firmware. Specifically, the device includes: a real-time acquisition module 800, a judgment module 810, and an execution module 820. The real-time acquisition module 800 is used to acquire the liquid level height of each negative pressure cup in real time. The judgment module 810 is used to determine whether there is a target negative pressure cup among the multiple negative pressure cups with a liquid level height higher than a first preset liquid level height. The execution module 820 is used to execute a target venting strategy on the target charging cell corresponding to the target negative pressure cup when the judgment module 810 determines that there is a target negative pressure cup among the multiple negative pressure cups with a liquid level height higher than the first preset liquid level height. The target venting strategy includes: controlling the target charging cell to pause charging, and using a preset frequency to control the negative pressure ratio of the negative pressure regulating device to switch between an initial negative pressure ratio and an adjusted negative pressure ratio. The initial negative pressure ratio is used to drive the electrolyte to be drawn into the target negative pressure cup, and the adjusted negative pressure ratio is used to drive the electrolyte to flow back to the target charging cell.

[0099] The cell formation venting device provided in this solution correlates the cumulative gas production during cell formation with the electrolyte level in the negative pressure cup. A detection and control device collects the liquid level of each negative pressure cup in real time. Since the gas generated during cell formation pushes the electrolyte through the negative pressure branch pipe into the negative pressure cup, the more gas produced, the more electrolyte enters the negative pressure cup, and the higher the liquid level. Therefore, the liquid level directly maps to the actual gas production rate and amount of the cell. The detection and control device compares the collected liquid level with a first preset liquid level to determine if there is a target negative pressure cup with excessive gas production. When a target negative pressure cup exists, it indicates abnormal gas production in the corresponding target charging cell. In this case, a target venting strategy needs to be implemented: first, control the target... The charging process pauses when the battery cell is charging to prevent continuous gas production and accumulation during charging. A preset frequency control device switches between an initial negative pressure ratio and an adjusted negative pressure ratio. In the initial negative pressure phase, a higher negative pressure draws the electrolyte carrying unexpelled gas from the battery cell into a negative pressure cup, separating the gas from the electrolyte. In the adjusted negative pressure phase, the negative pressure is reduced, allowing the electrolyte in the negative pressure cup to flow back into the battery cell, preventing excessive electrolyte loss and further expelling residual gas. This periodic switching effectively removes gas from the battery cell while preventing resource waste caused by excessively high negative pressure, achieving dynamic gas control that adapts to the actual gas production of the battery cell.

[0100] According to some embodiments of this application, such as Figure 9 As shown, this application provides an electronic device 9, including: a processor 901 and a memory 902. The processor 901 and the memory 902 are interconnected and communicate with each other through a communication bus 903 and / or other forms of connection mechanism (not shown). The memory 902 stores a computer program executable by the processor 901. When the computing device is running, the processor 901 executes the computer program to execute any of the aforementioned optional implementation methods, such as steps S600 to S620: real-time acquisition of the liquid level height of each negative pressure cup; determination of whether there is a target negative pressure cup with a liquid level height higher than a first preset liquid level height among the multiple negative pressure cups; if so, execution of a target exhaust strategy for the target charging cell corresponding to the target negative pressure cup.

[0101] This application provides a computer-readable storage medium storing a computer program that, when executed by a processor, performs the method in any of the aforementioned optional implementations.

[0102] The storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read Only Memory (EPROM), Programmable Red-Only Memory (PROM), Read-Only Memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk.

[0103] This application provides a computer program product that, when run on a computer, causes the computer to perform a method in any of the optional implementations.

[0104] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method for venting air during battery cell formation, characterized in that, The method is applied to battery cell formation exhaust equipment; The cell formation and venting equipment includes: a negative pressure regulating device, a detection and control device, and at least one negative pressure cup. One end of each negative pressure cup is connected to a charging cell via a negative pressure branch pipe. The other end of each negative pressure cup is connected to a first end of the negative pressure regulating device. The second end of the negative pressure regulating device is used to access negative pressure. The detection and control device is electrically connected to the negative pressure regulating device. The method is executed by the detection and control device, and the method includes: Real-time acquisition of the liquid level height of each negative pressure cup; Determine whether there is a target negative pressure cup among multiple negative pressure cups whose liquid level is higher than the first preset liquid level; If there is a target negative pressure cup among the multiple negative pressure cups with a liquid level higher than the first preset liquid level, then the target venting strategy is executed on the target charging cell corresponding to the target negative pressure cup. The target exhaust strategy includes: controlling the target charging cell to pause charging, and using a preset frequency to control the negative pressure ratio of the negative pressure regulating device to switch between an initial negative pressure ratio and an adjusted negative pressure ratio; the initial negative pressure ratio is used to drive the electrolyte to be drawn into the target negative pressure cup, and the adjusted negative pressure ratio is used to drive the electrolyte to flow back to the target charging cell.

2. The method according to claim 1, characterized in that, After implementing the target venting strategy on the target charging cell corresponding to the target negative pressure cup, the method further includes: Obtain the liquid level height of the target negative pressure cup; Determine whether the liquid level in the target negative pressure cup is higher than a second preset liquid level; wherein the second preset liquid level is lower than the first preset liquid level. If it is determined that the liquid level of the target negative pressure cup is higher than the second preset liquid level, the target venting strategy is executed again on the target charging cell corresponding to the target negative pressure cup until the liquid level of the target negative pressure cup is no higher than the second preset liquid level.

3. The method according to claim 2, characterized in that, The method further includes: If it is determined that the liquid level of the target negative pressure cup is not higher than the second preset liquid level, then the target charging cell is controlled to resume charging, and the negative pressure ratio of the negative pressure regulating device is adjusted to the initial negative pressure ratio.

4. The method according to claim 1, characterized in that, The control of pausing charging of the target charging cell includes: Send a power supply pause signal to the power control equipment; The power supply is electrically connected to each charging cell through the power control device. The pause power supply signal carries the cell identifier of the target charging cell and is used to drive the power control device to control the target charging cell to pause charging.

5. The method according to claim 1, characterized in that, The control of pausing charging of the target charging cell includes: Send a pause power supply signal to the target power controller corresponding to the target charging cell; The charging cells are multiple, and the power supply is electrically connected to the multiple charging cells through multiple power controllers. Each charging cell is connected to a power controller, and the pause power supply signal is used to drive the target power controller to control the target charging cell to pause charging.

6. A cell formation exhaust device, characterized in that, The cell formation and exhaust equipment includes: a negative pressure regulating device, a detection and control device, and at least one negative pressure cup; one end of each negative pressure cup is connected to a charging cell through a negative pressure branch pipe, the other end of each negative pressure cup is connected to the first end of the negative pressure regulating device, the second end of the negative pressure regulating device is used to access negative pressure, and the detection and control device is electrically connected to the negative pressure regulating device. The control device is used to detect the liquid level height of the corresponding negative pressure cup in real time; determine whether there is a target negative pressure cup with a liquid level height higher than a first preset liquid level height among the multiple negative pressure cups; if there is a target negative pressure cup with a liquid level height higher than the first preset liquid level height among the multiple negative pressure cups, then execute a target venting strategy on the target charging cell corresponding to the target negative pressure cup; wherein, the target venting strategy is: controlling the target charging cell to pause charging, and using a preset frequency to control the negative pressure ratio of the negative pressure regulating device to switch between an initial negative pressure ratio and an adjusted negative pressure ratio; the initial negative pressure ratio is used to drive the electrolyte to be drawn into the target negative pressure cup, and the adjusted negative pressure ratio is used to drive the electrolyte to flow back to the target charging cell.

7. The cell formation exhaust equipment according to claim 6, characterized in that, The detection and control device includes a detection device and a control device. The number of the charging cell, the negative pressure cup, and the detection device is one each. The detection device is disposed inside the negative pressure cup. The cell formation exhaust device also includes a negative pressure connecting pipe. One end of the negative pressure cup is connected to the charging cell through a negative pressure branch pipe, and the other end of the negative pressure cup is connected to the first end of the negative pressure regulating device through the negative pressure connecting pipe. The negative pressure regulating device is electrically connected to the control device.

8. The cell formation exhaust equipment according to claim 6, characterized in that, The detection and control device includes a detection device and a control device. The number of the charging cells, negative pressure cups and detection devices are the same and there are multiple of them. Each negative pressure cup is equipped with a detection device. The cell formation exhaust equipment also includes a busbar; One end of each negative pressure cup is connected to a charging cell via a negative pressure branch pipe, and the other end of each negative pressure cup is connected to the first end of the busbar. The second end of the busbar is connected to the first end of the negative pressure regulating device.

9. The cell formation exhaust equipment according to claim 6, characterized in that, The cell formation exhaust equipment also includes a power supply and a power control device; The power supply is electrically connected to each charging cell through the power control device, and the power control device is electrically connected to the control device. The control device is used to send a power supply pause signal to the power control equipment; wherein the power supply pause signal carries the cell identifier of the target charging cell; The power control device is used to control the target charging cell to pause charging in response to the power supply interruption signal.

10. A cell formation exhaust system, characterized in that, The cell formation and exhaust system includes at least one charging cell, a negative pressure generating device, and the cell formation and exhaust device according to any one of claims 6-9, wherein each charging cell is connected to a negative pressure cup through a negative pressure branch pipe, and the negative pressure generating device is connected to the second end of the negative pressure regulating device.

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