Battery cell formation method, device and equipment, electronic equipment, medium and program product

Abstract

The invention relates to a battery cell formation method, device and equipment, electronic equipment, a medium and a program product. The method comprises the following steps: acquiring the battery cell voltage of each battery cell loaded into the formation equipment; the battery cells are connected with the formation system and the water removal system; and performing water content identification processing on each battery cell according to the battery cell voltage of each battery cell, acquiring a water removal agent injection amount under the condition that a target battery cell with abnormal water content is identified, and controlling the water removal system according to the water removal agent injection amount and the target battery cell. The water removal system injects a water removal agent into the target battery cell according to the water removal agent injection amount; and controlling the formation system to carry out formation treatment on all the battery cells loaded into the formation equipment. By adopting the method, the water content in the battery cell can be accurately controlled, so that the production yield and the consistency of the battery cell are greatly improved.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, specifically to a cell formation method, apparatus, equipment, electronic equipment, medium, and process product. Background Technology

[0002] In the lithium-ion battery production process, moisture is one of the most critical factors affecting cell quality. Normally, cells undergo rigorous baking and drying before electrolyte filling. However, due to factors such as prolonged exposure of cells outside the drying chamber after baking and before electrolyte filling, residual moisture in incompletely dried electrodes or separators, trace amounts of moisture in the electrolyte itself, and slow infiltration of moisture from the environment before the formation process, the water content of the cells may become too high. This can lead to reduced initial coulombic efficiency, increased irreversible capacity loss, shortened cycle life, and problems such as gas generation, severely impacting cell consistency and yield.

[0003] Currently, the industry commonly uses methods such as optimizing the baking process and strictly controlling the environmental dew point. However, these methods are relatively passive and make it difficult to accurately control the water content in the battery cells. Summary of the Invention

[0004] To address the aforementioned issues, this application provides a cell formation method, apparatus, device, electronic equipment, medium, and process product that can precisely control the water content in the cell, thereby significantly improving production yield and cell consistency.

[0005] In a first aspect, this application provides a cell formation method, applied to a control system of a formation equipment, the formation equipment further including a formation system and a dehydration system, the method comprising:

[0006] Obtain the cell voltage of each battery cell installed in the formation equipment; connect each battery cell to the formation system and the dehydration system;

[0007] The water content of each battery cell is identified based on its cell voltage. If a target battery cell with abnormal water content is identified, the amount of dehydrating agent injected is obtained. The dehydration system is controlled according to the amount of dehydrating agent injected and the target battery cell, so that the dehydration system injects dehydrating agent into the target battery cell according to the amount of dehydrating agent injected.

[0008] The formation control system performs formation processing on all cells loaded into the formation equipment;

[0009] The determination of the amount of desiccant injected includes:

[0010] Obtain the electrolyte injection volume of the target cell and the abnormal cell voltage corresponding to the target cell;

[0011] The amount of dehydrating agent to be injected is calculated based on the electrolyte injection volume, abnormal cell voltage, and preset addition range.

[0012] In some embodiments, water content identification processing for each battery cell is performed based on its cell voltage, including:

[0013] For each battery cell, if the curve characteristic value corresponding to the battery cell is less than a preset threshold, the battery cell is identified as a target battery cell with abnormal water content; the preset threshold is determined based on historical statistical data and product quality requirements.

[0014] In some embodiments, the dehydrating agent includes one or more of hexamethyldisilazane, 1-(trimethylsilyl)imidazolium, trimethylsilyl phosphite, and triphenylphosphine.

[0015] In some embodiments, the method further includes:

[0016] Obtain the voltage of multiple target cells during the formation process;

[0017] The voltage statistics are obtained by statistically analyzing the voltages of multiple target cells.

[0018] The quality of the target battery cell is evaluated based on voltage statistics and reference statistics to obtain the quality evaluation results.

[0019] In some embodiments, the method further includes:

[0020] An operation log is generated based on the dehydration treatment, wherein the operation log includes at least one of the following: the cell identifier of the target cell, the injection time and injection amount of the dehydrating agent.

[0021] Secondly, this application also provides a cell formation apparatus, applied to a control system of a formation equipment, the formation equipment further including a formation system and a dehydration system, the apparatus comprising:

[0022] The voltage acquisition module is used to acquire the cell voltage of each cell installed in the formation equipment; each cell is connected to the formation system and the dewatering system.

[0023] The water removal module is used to identify the water content of each battery cell based on the cell voltage, and when a target battery cell with abnormal water content is identified, it obtains the amount of water removal agent to be injected. Based on the amount of water removal agent injected and the target battery cell, the water removal system is controlled so that the water removal system injects water removal agent into the target battery cell according to the amount of water removal agent injected.

[0024] The formation module is used to control the formation system to perform formation processing on all the cells loaded into the formation equipment;

[0025] The dehydration module is specifically used to obtain the electrolyte injection volume of the target battery cell and the abnormal battery cell voltage corresponding to the target battery cell; and to calculate the amount of dehydrating agent injected based on the electrolyte injection volume, the abnormal battery cell voltage and the preset addition range.

[0026] Thirdly, this application also provides a chemical formation device, which includes a chemical formation cabinet body, a data acquisition system, a water removal system, a chemical formation system, and a control system;

[0027] The main body of the formation cabinet is equipped with multiple formation channels. Each formation channel is equipped with components of a data acquisition system, a dehydration system, and a formation system. The formation channels are used to hold the battery cells.

[0028] The control system is connected to the data acquisition system, the dewatering system, and the formation system, respectively, and is used to execute the method described in the first aspect.

[0029] In some embodiments, the dehydration system includes a dehydrating agent storage tank, an injection pump, and multiple injection passages; the injection pump is connected to the dehydrating agent storage tank and each injection passage respectively; each injection passage includes an injection valve, an injection line, and an injection needle.

[0030] The injection needle is used to connect to the injection interface of the battery cell;

[0031] The control system is connected to the injection pump and injection valve respectively. The control system is used to control the injection pump and injection valve according to the amount of dehydrating agent injected, so as to inject dehydrating agent into the target battery cell with abnormal water content.

[0032] Fourthly, this application also 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 implement the method of any one of the first aspects.

[0033] Fifthly, this application also provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the method of any one of the first aspects.

[0034] Sixthly, this application also provides a computer program product, including a computer program that, when executed by a processor, implements the method of any one of the first aspects. Attached Figure Description

[0035] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the alternative embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0036] Figure 1This is a schematic diagram of the structure of a cell formation device according to an embodiment of this application;

[0037] Figure 2 This is a schematic diagram of the structure of a water removal system according to an embodiment of this application;

[0038] Figure 3 This is a schematic flowchart of a cell formation method according to an embodiment of this application;

[0039] Figure 4 This is a schematic diagram of the voltage distribution according to an embodiment of this application;

[0040] Figure 5 This is a flowchart illustrating the steps for obtaining the amount of dehydrating agent injected according to an embodiment of this application;

[0041] Figure 6 This is a flowchart illustrating the quality assessment steps according to an embodiment of this application;

[0042] Figure 7 This is one of the structural block diagrams of a cell formation apparatus according to an embodiment of this application;

[0043] Figure 8 This is a second structural block diagram of a cell formation apparatus according to an embodiment of this application;

[0044] Figure 9 This is the third structural block diagram of a cell formation apparatus according to an embodiment of this application;

[0045] Figure 10 This is an internal structural diagram of an electronic device according to an embodiment of this application.

[0046] Explanation of reference numerals in the attached figures:

[0047] 11. Formation cabinet main body; 12. Data acquisition system; 13. Dehydration system; 14. Formation system;

[0048] 15. Control system; 131. Dehydrating agent storage tank; 132. Injection pump; 133. Injection passage;

[0049] 1331. Injection valve; 1332. Injection tubing; 1333. Injection needle. Detailed Implementation

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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).

[0056] 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.

[0057] In the lithium-ion battery production process, moisture is one of the most critical factors affecting cell quality. Normally, cells undergo rigorous baking and drying before electrolyte filling. However, situations such as prolonged storage outside the drying chamber after baking and before electrolyte filling, incomplete drying of electrodes or separators with residual moisture, trace amounts of moisture in the electrolyte itself, and slow infiltration of moisture from the environment before the formation process can lead to excessively high water content. This results in reduced initial coulombic efficiency, increased irreversible capacity loss, shortened cycle life, and gas generation, severely impacting cell consistency and yield.

[0058] Currently, the industry commonly uses methods such as optimizing the baking process and strictly controlling the environmental dew point. However, these methods are relatively passive and difficult to precisely control the water content in the battery cells. Furthermore, current methods typically employ batch sampling inspection, making it impossible to perform non-destructive full inspection of all battery cells.

[0059] To address the aforementioned issues, this application improves the formation equipment by incorporating a dehydration system. During the formation process, the equipment's control system acquires the cell voltage of each battery cell. Based on this voltage, the system identifies the water content of each cell. If a target cell with abnormal water content is identified, the dehydration system is activated to remove water from it. Subsequently, the formation system processes all cells. In this embodiment, the technical solution allows for real-time determination of water content abnormalities based on cell voltage, achieving full inspection. Upon identifying a target cell with abnormal water content, a dehydrating agent is automatically and precisely injected, thereby accurately controlling the water content in the cells during the formation process. This restores the initial efficiency and capacity of cells with abnormal water content to normal levels, significantly improving production yield and cell consistency.

[0060] The cell formation method provided in this application embodiment can be applied to, for example... Figure 1 The formation equipment shown includes a formation cabinet body 11, a data acquisition system 12, a dehydration system 13, a formation system 14, and a control system 15. The formation cabinet body 11 contains multiple formation channels, each containing components of the data acquisition system 12, the dehydration system 13, and the formation system 14. The formation channels are used to hold the battery cells. The control system 15 is connected to the data acquisition system 12, the dehydration system 13, and the formation system 14. The control system 15 acquires the cell voltage of each battery cell from the data acquisition system 12. Based on the cell voltage, it identifies the water content of each battery cell. If a target battery cell with abnormal water content is identified, it controls the dehydration system 13 to dehydrate the target battery cell. Finally, it controls the formation system 14 to perform formation processing on all battery cells.

[0061] In this embodiment, the data acquisition system 12, the water removal system 13, the formation system 14, and the control system 15 of the formation equipment are all located in the main body 11 of the formation cabinet.

[0062] The main body 11 of the formation cabinet is equipped with multiple formation channels, and clamps are installed in the formation channels to hold and fix the battery cells. The clamps have reliable docking functions for the positive and negative tabs of the battery cells and the contacts, heating plate limiting functions, contact protection functions to prevent no-load pressure damage, and heating plate insulation protection functions.

[0063] The data acquisition system 12 may include multiple sets of sensors. Each formation channel is equipped with a corresponding number of sensors according to the number of battery cells placed therein. The sensors may include, but are not limited to, temperature sensors, current sensors, voltage sensors, air pressure sensors, smoke sensors, etc. After the battery cell is placed in the formation channel, the battery cell is connected to some of the sensors, for example, the battery cell is connected to a voltage sensor, and the battery cell voltage is collected through the voltage sensor.

[0064] Reference Figure 2 The dehydration system 13 includes a dehydrating agent storage tank 131, an injection pump 132, and multiple injection channels 133. The injection pump 132 is connected to the dehydrating agent storage tank 131 and each injection channel 133. Each injection channel 133 includes an injection valve 1331, an injection line 1332, and an injection needle 1333. The injection needle 1333 is used to connect to the injection interface of the battery cell. The control system 15 is connected to the injection pump 132 and the injection valve 1331. The control system 15 is used to control the injection pump 132 and the injection valve 1331 according to the amount of dehydrating agent injected, so as to inject dehydrating agent into the target battery cell with abnormal water content. It should be noted that the control system and its connection relationship are not shown in the figure.

[0065] The desiccant storage tank 131 of the desiccant system 13 is connected to the injection pump 132. The injection pump 132 is connected to the injection valve 1331 of the injection passage 133. The injection valve 1331 is connected to one end of the injection line 1332, and the other end of the injection line 1332 is connected to the injection needle 1333. The injection line 1332 leads into the formation channel, and the number of injection lines 1332 in each formation channel matches the number of battery cells that can be placed in the formation channel. After the battery cell is placed into the formation channel, the injection needle 1333 is inserted into the injection port of the battery cell to connect the desiccant system 13 to the battery cell.

[0066] Understandably, incorporating a dehydration system into the formation equipment establishes a closed-loop feedback system of "signal detection -> intelligent diagnosis -> precise execution," enabling precise, quantitative, and non-destructive injection of the dehydrating agent. Furthermore, this expands the application scenarios and functions of the dehydrating agent.

[0067] The formation system 14 may include a charge / discharge assembly and an overcharge / over-discharge protection assembly. After the battery cell is placed into the formation channel, the charge / discharge assembly is connected to the battery cell, thereby forming the battery cell through the charge / discharge assembly.

[0068] The chemical formation equipment also includes a pressure control system and a temperature control system. The pressure control system can realize multi-stage pressure regulation and control and multi-stage negative pressure extraction control; the temperature control system includes heating plates and temperature protection components, which can realize uniform electric heating of the heating plates and temperature protection.

[0069] The control system 15 of the formation equipment is connected to the data acquisition system 12, the dehydration system 13, and the formation system 14. After the battery cells are placed in the formation channel and the data acquisition system 12, the dehydration system 13, and the formation system 14 are connected to the battery cells, the control system 15 can start the formation program, causing the data acquisition system 12 to acquire voltage data and transmit the acquired battery cell voltage to the control system 15. The control system 15 determines whether the water content of each battery cell is abnormal based on the battery cell voltage. If a target battery cell with abnormal water content is identified, the control system 15 controls the injection pump 132 in the dehydration system 13 to drive the dehydrating agent in the dehydrating agent storage tank 131 to flow into the injection passage 133 corresponding to the target battery cell, thereby injecting the dehydrating agent into the target battery cell and performing dehydration treatment on the target battery cell. Afterward, the control system 15 controls the formation system 14 to perform formation treatment on all battery cells.

[0070] It should be noted that the connection between the data acquisition system 12, the water removal system 13, and the formation system 14 and the battery cell can all be automated using formation equipment. Formation equipment may also include other structures and functions; this embodiment does not limit these, and can be configured according to actual conditions.

[0071] In the above embodiments, the formation equipment includes a formation cabinet body, a data acquisition system, a dehydration system, a formation system, and a control system; the dehydration system includes a dehydrating agent storage tank, an injection pump, and multiple injection channels; each injection channel includes an injection valve, an injection pipeline, and an injection needle. Through the formation equipment provided in this application embodiment, it is possible to determine in real time whether the water content of each battery cell is abnormal based on the battery cell voltage, and to achieve full inspection of all battery cells that have undergone the formation process. Afterwards, if a target battery cell with abnormal water content is identified, the formation equipment can automatically and accurately inject a dehydrating agent into the target battery cell, thereby accurately controlling the water content in the battery cell during the formation process, restoring the initial efficiency and capacity of the battery cell with abnormal water content to normal levels, and thus significantly improving the production yield and battery cell consistency.

[0072] According to some embodiments of this application, refer to Figure 3 A method for forming battery cells is provided, which is illustrated by taking the application of this method to the control system of the forming equipment as an example. It may include the following steps:

[0073] Step 201: Obtain the cell voltage of each cell installed in the formation equipment; connect each cell to the formation system and the dewatering system.

[0074] After multiple battery cells are loaded into the formation equipment and each cell is connected to the charge / discharge components of the formation system and the injection needle of the dehydration system, the data acquisition system collects the voltage of each cell according to a preset acquisition cycle and transmits the collected cell voltage to the control system.

[0075] The control system receives the cell voltage of each cell and generates a voltage-time (Vt) curve based on the relationship between cell voltage and acquisition time.

[0076] In some embodiments, the data acquisition system may also acquire capacity, and the control system may generate a voltage-capacity (VQ) curve based on the cell voltage and capacity.

[0077] Step 202: Based on the cell voltage of each cell, perform water content identification processing on each cell. If a target cell with abnormal water content is identified, obtain the amount of dehydrating agent injected. Control the dehydration system according to the amount of dehydrating agent injected and the target cell, so that the dehydration system injects dehydrating agent into the target cell according to the amount of dehydrating agent injected.

[0078] The control system includes a standard curve, determined based on the cell voltage of cells with normal water content over historical periods. This standard curve characterizes the voltage change of cells with normal water content over time. For each cell, the control system compares its voltage-time curve with the standard curve. If the trend of the cell's voltage-time curve matches the standard curve, the cell's water content is determined to be normal; if the trend does not match the standard curve, the cell's water content is determined to be abnormal.

[0079] In other embodiments, the control system includes a water content identification model. The voltage-time curves corresponding to each battery cell are input into the water content identification model to obtain the water content anomaly probability output by the model. Based on the water content anomaly probability and a preset probability threshold, the target battery cell with abnormal water content is identified. For example, if the preset probability threshold is 85%, and the voltage-time curve corresponding to battery cell 1 is input into the water content identification model, the model outputs a water content anomaly probability of 90%. This probability is greater than the preset probability threshold, therefore battery cell 1 is determined to be the target battery cell with abnormal water content. Similarly, if the voltage-time curve corresponding to battery cell 2 is input into the water content identification model, and the model outputs a water content anomaly probability of 80%, this probability is less than the preset probability threshold, therefore battery cell 2 is determined to have normal water content.

[0080] It should be noted that the identification and handling of abnormal water content based on cell voltage is not limited to the above example, and can be set according to the actual situation.

[0081] In practical applications, if all battery cells have normal water content and no target cell with abnormal water content is identified, the formation process is executed directly. If a target cell with abnormal water content is identified, the control system pauses the formation process, obtains the amount of dehydrating agent injected, and controls the dehydration system based on the amount of dehydrating agent injected and the target battery cell, so that the dehydration system injects dehydrating agent into the target battery cell according to the amount of dehydrating agent injected.

[0082] The control system can be pre-set with a fixed amount of desiccant. After identifying a target cell with abnormal water content, the control system determines the target injection path corresponding to the target cell from multiple injection paths based on the cell identifier, and determines the target opening degree of the injection valve in the target injection path based on the amount of desiccant injected.

[0083] Subsequently, the control system controls the injection pump of the dehydration system to operate, causing the injection pump to drive the flow of dehydrating agent in the dehydrating agent storage tank. The control system controls the injection valve in the target injection passage, causing the dehydrating agent to flow into the target injection passage, and the amount of dehydrating agent injected into the target battery cell is the preset amount.

[0084] Understandably, the embodiments of this application realize online diagnosis of moisture problems in the formation process, solving the blind spot problem of moisture control after baking. It changes from traditional passive prevention to active repair, that is, adding dehydrating agent in the middle of the formation process, realizing precise, quantitative and non-destructive injection of dehydrating agent. Moreover, the dehydration treatment is an independent, precise and automated operation for specific battery cells, which can realize industrial practicality and mass production.

[0085] Reference Figure 4 Obtaining the amount of desiccant injected may include the following steps:

[0086] Step 301: Obtain the electrolyte injection volume of the target cell and the abnormal cell voltage corresponding to the target cell.

[0087] The control system can acquire relevant records of the target battery cell during the first electrolyte injection process and determine the electrolyte injection volume of the target battery cell based on the records. Furthermore, during the water content identification process, battery cell voltages below a preset threshold are identified as abnormal battery cell voltages corresponding to the target battery cell.

[0088] Step 302: Calculate the amount of dehydrating agent to be injected based on the electrolyte injection volume, abnormal cell voltage, and preset addition range.

[0089] A mapping relationship is pre-established between the amount of dehydrating agent injected, the amount of electrolyte injected, and the abnormal cell voltage. The mapping relationship is as follows: y=[a*|b|Ine^|b|*x]^0.1, where a represents the preset addition range, which can be a value from 0.01% to 100%, and optionally a=5%, b is the abnormal cell voltage (mV), and x is the amount of electrolyte injected for the first time (g).

[0090] By substituting the obtained electrolyte injection volume and abnormal cell voltage into the above mapping relationship, the amount of dehydrating agent injected can be calculated.

[0091] In some embodiments, the dehydrating agent includes one or more of hexamethyldisilazane (HMDS), 1-(trimethylsilyl)imidazolium (1-TMSI), trimethylsilyl phosphite (TMSPi), and triphenylphosphine (TPP). These reagents react efficiently with H2O and HF, and their reaction products (such as hexamethyldisilazane) are harmless or beneficial to SEI film formation.

[0092] In some embodiments, the dehydrating agent is an isocyanate, such as p-toluenesulfonyl isocyanate (PTSI). The isocyanate group (-NCO) can undergo an addition reaction with H2O. Some novel compounds improve reaction efficiency by introducing other groups (such as sulfonates) and can inhibit the hydrolysis of LiPF6 to produce HF, sometimes also possessing film-forming properties.

[0093] For example, if the initial electrolyte injection volume for the target cell is x = 500g, and the abnormal cell voltage is -17mV, after identifying the target cell, the control system pauses charging and initiates the dehydrating agent addition program. The electrolyte injection volume, abnormal cell voltage, and preset addition range a = 5% are substituted into the mapping relationship for calculation: y = [5% * |-17| * In(e^|-17|) * 500]^0.1 = 1.93g. Therefore, the required amount of toluenesulfonyl isocyanate (PTSI) is calculated to be 1.93g.

[0094] For example, if the initial electrolyte injection volume for the target cell is x=900g and the abnormal cell voltage is -8.7mV, after identifying the target cell, the control system first pauses charging and starts the dehydrator addition program. The electrolyte injection volume, the abnormal cell voltage, and the preset addition range a=5% are substituted into the mapping relationship for calculation: y=[5%*|-8.7|*In(e^|-8.7|)*900]^0.1=1.791g. The amount of toluenesulfonyl isocyanate (PTSI) to be added is 1.791g.

[0095] For example, if the initial electrolyte injection volume for the target cell is x=900g and the abnormal cell voltage is -15.9mV, after identifying the target cell, the control system pauses charging and starts the dehydrator addition program. The electrolyte injection volume, the abnormal cell voltage, and the preset addition range a=5% are substituted into the mapping relationship for calculation: y=[5%*|-15.9|*In(e^|-15.9|)*900]^0.1 =2.02g. The amount of toluenesulfonyl isocyanate (PTSI) to be added is 2.02g.

[0096] In some embodiments, the control system generates an operation log based on the dewatering treatment, wherein the operation log includes at least one of the following: the cell identifier of the target cell, the injection time and amount of the dewatering agent.

[0097] Understandably, operation logs can be used not only for quality traceability and process optimization of battery cell production lifecycle data, but also for big data analysis to reverse-optimize front-end processes (such as baking time) or optimize preset thresholds of formation equipment.

[0098] Understandably, the electrolyte injection volume of the target battery cell and the abnormal battery cell voltage corresponding to the target battery cell are obtained; the amount of dehydrating agent injected is calculated based on the electrolyte injection volume, the abnormal battery cell voltage and the preset addition range. In this way, the amount of dehydrating agent injected can be matched with the actual situation of the battery cell, thereby controlling the water content of the battery cell more accurately and improving the consistency of the battery cell.

[0099] Step 203: Control the formation system to perform formation processing on all the cells loaded into the formation equipment.

[0100] After the dehydrating agent is injected, the control system restarts the formation process and sends charge and discharge commands to the formation system, so that the formation system performs formation treatment on all cells according to the charge and discharge commands.

[0101] It should be noted that the formation parameters, such as resting time, charging time, charging current, charging voltage, charging power, discharging time, discharging current, discharging voltage, and discharging power, can all be set according to the actual needs of the battery cell.

[0102] In the above embodiments, the cell voltage of each battery cell is obtained; based on the cell voltage of each battery cell, water content identification processing is performed on each battery cell; if a target battery cell with abnormal water content is identified, the amount of dehydrating agent injected is obtained; the dehydrating system is controlled according to the amount of dehydrating agent injected and the target battery cell, so that the dehydrating system injects dehydrating agent into the target battery cell according to the amount of dehydrating agent injected; then, the formation system is controlled to perform formation processing on all battery cells. In the technical solution of this application embodiment, the cell voltage of each battery cell can be used to determine in real time whether the battery cell has abnormal water content, and full inspection is achieved. After identifying a target battery cell with abnormal water content, dehydrating agent is automatically and accurately injected into the target battery cell, thereby accurately controlling the water content in the battery cell during the formation process, restoring the initial efficiency and capacity of the battery cell with abnormal water content to the normal level, and thus significantly improving the production yield and battery cell consistency.

[0103] According to some embodiments of this application, the above embodiment of "identifying the water content of each battery cell based on the battery cell voltage" includes: for each battery cell, if the curve feature value corresponding to the battery cell is less than a preset threshold, the battery cell is identified as a target battery cell with abnormal water content.

[0104] Among them, the curve characteristic value corresponding to the battery cell is the characteristic value of the voltage-time curve generated based on the battery cell voltage and the acquisition time. This characteristic value can be the slope, curvature, etc. of the voltage-time curve, or it can be the most recently acquired battery cell voltage.

[0105] The preset threshold was determined based on historical statistical data and product quality requirements. Statistical processing was performed on the cell voltages of battery cells with abnormal water content and those with normal water content during historical periods to obtain the voltage distribution. Figure 5 The horizontal axis represents cell voltage, and the vertical axis represents the equivalent ICE at 2.0V. This figure shows that the cell voltage of samples with abnormal water content is generally lower than that of samples with normal water content. A preset threshold is determined based on the voltage distribution and product quality requirements (initial coulombic efficiency, cell voltage, etc.).

[0106] Taking the latest cell voltage as an example, the data acquisition system collects voltage data according to a preset acquisition cycle and transmits the collected cell voltages to the control system. For each cell, the control system compares the cell voltage with a preset threshold each time it receives a cell voltage. If the cell voltage is greater than or equal to the preset threshold, the cell's water content is determined to be normal; if the cell voltage is less than the preset threshold, the cell's water content is determined to be abnormal, and the cell is identified as the target cell.

[0107] In the above embodiments, for each battery cell, if the curve characteristic value corresponding to the cell is less than a preset threshold, the cell is identified as a target cell with abnormal water content. In the technical solution of this application embodiment, intelligent diagnosis based on voltage-time curves not only achieves non-destructive full inspection of water content but also enables precise repair of problematic cells, thereby saving costs and improving cell consistency.

[0108] According to some embodiments of this application, refer to Figure 6 It may also include the following steps:

[0109] Step 401: Obtain multiple cell voltages of the target cell during the formation process.

[0110] The control system controls the formation system to perform formation processing on all battery cells. During the formation process, the data acquisition system collects voltage data from each battery cell according to a preset acquisition cycle and transmits the collected cell voltage data to the control system.

[0111] After the formation process is completed, the control system determines the voltages of multiple target cells with abnormal water content from the received cell voltages.

[0112] Step 402: Statistical analysis is performed on the voltages of multiple target cells to obtain voltage statistics results.

[0113] The control system can calculate the average voltage, minimum voltage, maximum voltage, and variance of multiple cell voltages of the target battery cell, and obtain voltage statistics results.

[0114] Step 403: Evaluate the cell quality of the target cell based on the voltage statistics and reference statistics to obtain the quality evaluation result.

[0115] The reference statistics are the voltage statistics of battery cells with normal water content, including the reference average voltage, minimum voltage, maximum voltage, and variance.

[0116] After determining the voltage statistics of the target cell, the voltage statistics of the target cell are compared with the reference statistics. Based on the comparison results, the cell quality of the target cell is evaluated to obtain the quality evaluation results.

[0117] For example, a reference voltage range is determined based on the average, minimum, and maximum reference voltage values. If the average voltage of the target cell is within the reference voltage range, a quality assessment result of "qualified" is obtained; if the average voltage of the target cell is outside the reference voltage range, a quality assessment result of "unqualified" is obtained.

[0118] In some embodiments, the control system can further determine the initial coulombic efficiency of the target cell, compare the initial coulombic efficiency of the target cell with a reference efficiency range, and if the initial coulombic efficiency of the target cell is within the reference efficiency range, a quality assessment result of "qualified" cell is obtained; if the initial coulombic efficiency of the target cell is outside the reference efficiency range, a quality assessment result of "unqualified" cell is obtained. Unqualified cells can be rejected.

[0119] It should be noted that other evaluation methods can also be used to assess the quality of the target battery cell. This application does not limit the methods used in this embodiment, and the appropriate method can be selected based on the actual situation.

[0120] After obtaining the quality assessment results, the results are recorded in the database.

[0121] In the above embodiments, multiple cell voltages of the target cell during the formation process are obtained; statistical analysis is performed on the multiple cell voltages of the target cell to obtain voltage statistical results; and the cell quality of the target cell is evaluated based on the voltage statistical results and reference statistical results to obtain a quality evaluation result. In the technical solution of this application embodiment, performing quality evaluation on the cell can reduce the outflow of unqualified products, thereby improving battery quality.

[0122] According to some embodiments of this application, a cell formation method is provided. Taking the application of this method to the control system of a formation equipment as an example, the method may include the following steps:

[0123] Step 1: Obtain the cell voltage of each cell installed in the formation equipment; connect each cell to the formation system and the dewatering system.

[0124] Step 2: For each cell, if the curve characteristic value of the cell is less than the preset threshold, the cell is identified as a target cell with abnormal water content.

[0125] The preset threshold is determined based on historical statistical data and product quality requirements.

[0126] Step 3: Obtain the electrolyte injection volume of the target cell and the abnormal cell voltage corresponding to the target cell.

[0127] Step 4: Calculate the amount of dehydrating agent to be injected based on the electrolyte injection volume, abnormal cell voltage, and preset addition range.

[0128] Step 5: Control the dehydration system according to the amount of dehydrating agent injected and the target cell, so that the dehydration system injects dehydrating agent into the target cell according to the amount of dehydrating agent injected.

[0129] Step 6: Generate an operation log based on the water removal process.

[0130] The operation log includes at least one of the following: the cell identifier of the target cell, the injection time and amount of the dehydrating agent.

[0131] Step 7: Control the formation system to perform formation processing on all the cells loaded into the formation equipment.

[0132] Step 8: Obtain the voltage of multiple target cells during the formation process.

[0133] Step 9: Statistically analyze the voltage of multiple target cells to obtain voltage statistics results.

[0134] Step 10: Evaluate the cell quality of the target cell based on the voltage statistics and reference statistics to obtain the quality evaluation results.

[0135] In this embodiment, a closed-loop feedback system of "signal detection -> intelligent diagnosis -> precise execution" is established. Based on the cell voltage of each cell, it can determine in real time whether the cell has abnormal water content. After identifying the target cell with abnormal water content, a dehydrating agent is automatically and precisely injected into the target cell. This allows for precise control of the water content in the cell during the formation process, restoring the initial efficiency and capacity of the cell with abnormal water content to normal levels, thereby significantly improving production yield and cell consistency.

[0136] It should be understood that although the steps in the flowchart above are shown sequentially as indicated by the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowchart above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages in other steps.

[0137] Based on the same inventive concept, this application also provides a cell formation apparatus for implementing the cell formation method described above. The solution provided by this apparatus is similar to the solution described in the above method; therefore, the specific limitations in one or more cell formation apparatus embodiments provided below can be found in the limitations of the cell formation method described above, and will not be repeated here.

[0138] According to some embodiments of this application, refer to Figure 7 A cell formation apparatus is provided, which is applied to the control system of a formation equipment. The formation equipment also includes a formation system and a dehydration system. The apparatus includes:

[0139] The voltage acquisition module 501 is used to acquire the cell voltage of each cell installed in the formation equipment; each cell is connected to the formation system and the dewatering system.

[0140] The water removal module 502 is used to identify the water content of each battery cell based on the cell voltage of each battery cell, and to obtain the amount of water removal agent injected when a target battery cell with abnormal water content is identified. The water removal system is controlled according to the amount of water removal agent injected and the target battery cell, so that the water removal system injects water removal agent into the target battery cell according to the amount of water removal agent injected.

[0141] Formation module 503 is used to control the formation system to perform formation processing on all cells loaded into the formation equipment;

[0142] The dehydration module 502 is specifically used to obtain the electrolyte injection volume of the target battery cell and the abnormal battery cell voltage corresponding to the target battery cell; and to calculate the amount of dehydrating agent injected based on the electrolyte injection volume, the abnormal battery cell voltage and the preset addition range.

[0143] In some embodiments, the water removal module 502 is specifically used to identify a battery cell as a target battery cell with abnormal water content when the curve characteristic value corresponding to the battery cell is less than a preset threshold; wherein the preset threshold is determined based on historical statistical data and product quality requirements.

[0144] In some embodiments, the dehydrating agent includes one or more of hexamethyldisilazane, 1-(trimethylsilyl)imidazolium, trimethylsilyl phosphite, and triphenylphosphine.

[0145] In some embodiments, refer to Figure 8 The device also includes:

[0146] The voltage acquisition module 501 is also used to acquire the voltages of multiple cells of the target cell during the formation process;

[0147] The statistics module 504 is used to perform statistics on the voltage of multiple cells of the target cell and obtain voltage statistics results.

[0148] The quality assessment module 505 is used to assess the cell quality of the target cell based on voltage statistics and reference statistics, and obtain the quality assessment result.

[0149] In some embodiments, refer to Figure 9 The device also includes:

[0150] The log generation module 506 is used to generate an operation log based on the dewatering treatment, wherein the operation log includes at least one of the following: the cell identifier of the target cell, the injection time and injection amount of the dewatering agent.

[0151] Each module in the aforementioned cell formation device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in the processor of the electronic device in hardware form or independent of it, or stored in the memory of the electronic device in software form, so that the processor can call and execute the operations corresponding to each module.

[0152] According to some embodiments of this application, an electronic device is provided, the internal structure of which can be shown as follows: Figure 10 As shown, the electronic device includes a processor, memory, input / output interface, communication interface, display unit, and input device. The processor, memory, and input / output interface are connected via a system bus, and the communication interface, display unit, and input device are also connected to the system bus via the input / output interface. The processor provides computing and control capabilities. The memory includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores the operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The input / output interface is used for exchanging information between the processor and external devices. The communication interface is used for wired or wireless communication with external terminals; wireless communication can be achieved through Wi-Fi, mobile cellular networks, NFC (Near Field Communication), or other technologies. When the computer program is executed by the processor, it implements a cell formation method. The display unit is used to form a visually visible image and can be a display screen, projection device, or virtual reality imaging device. The display screen can be an LCD screen or an e-ink screen. The input device of the electronic device can be a touch layer covering the display screen, or buttons, trackballs, or touchpads set on the casing of the electronic device, or external keyboards, touchpads, or mice, etc.

[0153] Those skilled in the art will understand that Figure 10 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the electronic device to which the present application is applied. The specific electronic device may include more or fewer components than shown in the figure, or combine certain components, or have different component arrangements.

[0154] According to some embodiments of this application, a non-transitory computer-readable storage medium including instructions is also provided, such as a memory including instructions that can be executed by a processor of an electronic device to perform the above-described method. For example, the non-transitory computer-readable storage medium may be a ROM, random access memory (RAM), CD-ROM, magnetic tape, floppy disk, and optical data storage device, etc.

[0155] According to some embodiments of this application, a computer program product is also provided, which, when executed by a processor, can implement the above-described methods. The computer program product includes one or more computer instructions. When these computer instructions are loaded and executed on a computer, some or all of the above-described methods can be implemented, wholly or partially, according to the processes or functions described in the embodiments of this application.

[0156] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments described above. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0157] 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.

[0158] The embodiments described above merely illustrate several implementation methods of this application to facilitate a detailed understanding of the technical solutions of this application, but should not be construed as limiting the scope of protection of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. It should be understood that technical solutions obtained by those skilled in the art based on the technical solutions provided in this application through logical analysis, reasoning, or limited experimentation are all within the scope of protection of the appended claims. Therefore, the scope of protection of this patent application should be determined by the content of the appended claims, and the specification and drawings can be used to interpret the content of the claims.

Claims

1. A method for cell formation, characterized in that, A control system for a chemical formation device, the chemical formation device further including a chemical formation system and a dehydration system, the method comprising: The cell voltage of each battery cell installed in the formation equipment is obtained; each battery cell is connected to the formation system and the dehydration system; The water content of each battery cell is identified based on its cell voltage. If a target battery cell with abnormal water content is identified, the amount of dehydrating agent injected is obtained. The dehydration system is controlled according to the amount of dehydrating agent injected and the target battery cell, so that the dehydration system injects dehydrating agent into the target battery cell according to the amount of dehydrating agent injected. The formation system is controlled to perform formation processing on all battery cells loaded into the formation equipment; The method of obtaining the amount of dehydrating agent injected includes: Obtain the electrolyte injection volume of the target battery cell and the abnormal battery cell voltage corresponding to the target battery cell; The amount of dehydrating agent injected is calculated based on the electrolyte injection volume, the abnormal cell voltage, and the preset addition range.

2. The method according to claim 1, characterized in that, The process of identifying the water content of each battery cell based on its cell voltage includes: For each of the aforementioned battery cells, if the curve characteristic value corresponding to the battery cell is less than a preset threshold, the battery cell is identified as a target battery cell with abnormal water content; wherein, the preset threshold is determined based on historical statistical data and product quality requirements.

3. The method according to claim 1, characterized in that, The dehydrating agent includes one or more of hexamethyldisilazane, 1-(trimethylsilyl)imidazolium, trimethylsilyl phosphite, and triphenylphosphine.

4. The method according to any one of claims 1-3, characterized in that, The method further includes: Obtain multiple cell voltages of the target cell during the formation process; Based on the statistical analysis of multiple cell voltages of the target battery cell, voltage statistics results are obtained. The quality of the target battery cell is evaluated based on the voltage statistics and reference statistics to obtain the quality evaluation result.

5. The method according to any one of claims 1-3, characterized in that, The method further includes: An operation log is generated based on the dehydration treatment, wherein the operation log includes at least one of the following: the cell identifier of the target cell, the injection time and amount of the dehydrating agent.

6. A cell formation apparatus, characterized in that, A control system for a chemical formation device, the chemical formation device further including a chemical formation system and a dehydration system, the device comprising: A voltage acquisition module is used to acquire the cell voltage of each cell installed in the formation equipment; each cell is connected to the formation system and the dewatering system; The water removal module is used to identify the water content of each of the battery cells based on their cell voltage, and to obtain the amount of water removal agent injected when a target battery cell with abnormal water content is identified. The water removal system is controlled according to the amount of water removal agent injected and the target battery cell, so that the water removal system injects water removal agent into the target battery cell according to the amount of water removal agent injected. A formation module is used to control the formation system to perform formation processing on all cells loaded into the formation equipment; Specifically, the dehydration module is used to obtain the electrolyte injection volume of the target battery cell and the abnormal battery cell voltage corresponding to the target battery cell; and to calculate the amount of dehydrating agent injected based on the electrolyte injection volume, the abnormal battery cell voltage, and a preset addition range.

7. A chemical formation device, characterized in that, The chemical formation equipment includes a chemical formation cabinet body, a data acquisition system, a dehydration system, a chemical formation system, and a control system; The main body of the formation cabinet is provided with multiple formation channels, and each formation channel is provided with components of the data acquisition system, components of the dehydration system, and components of the formation system; the formation channels are used to hold the battery cells. The control system is connected to the data acquisition system, the water removal system and the formation system respectively, and the control system is used to perform the method as described in any one of claims 1-5.

8. The chemical formation equipment according to claim 7, characterized in that, The dehydration system includes a dehydrating agent storage tank, an injection pump, and multiple injection channels; the injection pump is connected to the dehydrating agent storage tank and each of the injection channels; each of the injection channels includes an injection valve, an injection line, and an injection needle. The injection needle is used to connect to the injection interface of the battery cell; The control system is connected to the injection pump and the injection valve respectively. The control system is used to control the injection pump and the injection valve according to the amount of dehydrating agent injected, so as to inject dehydrating agent into the target battery cell with abnormal water content.

9. An electronic device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the method of any one of claims 1 to 5.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the method of any one of claims 1 to 5.

11. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the method of any one of claims 1 to 5.

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