An automated assembly method, system, medium, and product for all-solid-state mold test batteries

Abstract

The application provides an automatic assembly method, system, medium and product of an all-solid-state mold test battery, relating to the field of solid-state battery assembly, and the method comprises the following steps: controlling a pressurizing unit to apply pressure to an all-solid-state battery mold in an axial direction until a target pressure maintaining state is reached; driving a screw locking unit to screw a fastener into the all-solid-state battery mold in the process of maintaining the target pressure maintaining state, and monitoring an axial load response parameter of the pressurizing unit in real time; when the axial load response parameter is monitored to reach a preset load transfer threshold, the screwing action of the screw locking unit is stopped, and a pressure-locked mold assembly is obtained; and controlling the pressurizing unit to remove external pressure from the mold assembly according to a preset curve, and obtaining an all-solid-state battery mold finished product. By implementing the method, seamless takeover of internal pressure by the fastener before external pressure removal can be realized, and the authenticity and accuracy of the internal forming pressure of the all-solid-state battery mold are ensured.

Description

Technical Field

[0001] This application relates to the field of solid-state battery assembly, and more particularly to an automated assembly method, system, medium, and product for testing batteries using all-solid-state molds. Background Technology

[0002] With the urgent need for high energy density and high safety in the new energy field, all-solid-state batteries have become the core direction of next-generation power battery research and development. In the material screening and process verification stages of all-solid-state batteries, in order to eliminate solid-solid interface impedance and ensure ion transport efficiency, it is usually necessary to use dedicated all-solid-state mold test batteries for performance testing. During the assembly process of these mold batteries, the internal solid electrolyte powder and positive and negative electrode materials are required to be compacted under extremely high axial pressure, and this high-pressure state needs to be locked in place for a long time through the mold's own fastening structure to simulate the high-pressure working environment in actual battery stacks, ensuring the accuracy and repeatability of electrochemical test data.

[0003] In related technologies, the mainstream approach employs a step-by-step "press-lock" combination scheme. Specifically, first, a mold filled with powder material is placed on the worktable of a servo press or hydraulic press. The press is controlled to output a constant set pressure value (e.g., several tons), compacting the powder inside the mold to the set thickness or density. Then, while the press maintains this constant pressure output, the locking bolts or nuts around the mold are screwed in manually or with a matching electric tightening gun until the torque value fed back by the tightening gun reaches the preset process standard (i.e., constant torque tightening mode). Once all fasteners have reached the set torque, the press releases the external pressure and retracts, completing the physical encapsulation of the mold battery.

[0004] However, due to the extreme variability of the friction coefficient during threaded connections, achieving the set torque does not directly equate to the fastener generating sufficient axial preload to fully balance the elastic rebound force of the internal solid electrolyte layer. Under current operating conditions, there is a lack of substantial correlation between the external press and the internal fasteners in terms of load transfer. When the external press is removed, if the actual axial tensile force of the fastener is less than the rebound thrust of the internal powder, the solid electrolyte layer inside the mold will experience instantaneous axial micro-expansion. This invisible micro-rebound may cause the actual internal pressure of the encapsulated mold battery to be significantly lower than the target pressure during pressurization, and the degree of pressure loss between different batches of molds is completely irregular, seriously interfering with the authenticity of the electrochemical performance evaluation of all-solid-state battery materials. Summary of the Invention

[0005] This application provides an automated assembly method, system, medium, and product for all-solid-state mold test batteries, which solves the problem of how to eliminate the pressure loss inside the all-solid-state mold battery after the external pressurization equipment is removed, thereby ensuring that the final locked internal pressure of the mold battery is highly consistent with the target pressure during assembly.

[0006] In a first aspect, this application provides an automated assembly method for testing batteries using an all-solid-state mold, applicable to an automated assembly system for testing batteries using an all-solid-state mold. The system includes a pressurization unit, an all-solid-state battery mold, and a screw-locking unit. The method comprises:

[0007] The pressurizing unit applies pressure to the all-solid-state battery mold along the axial direction until the target pressure holding state is reached. The target pressure holding state is the physical state in which the solid electrolyte layer inside the all-solid-state battery mold is compressed to a preset density and the pressurizing unit actively maintains a constant pressure.

[0008] During the process of maintaining the target pressure holding state, the drive screw unit screws the fastener into the all-solid-state battery mold, and monitors the axial load response parameters of the pressurizing unit in real time. The axial load response parameters include the amount of output force attenuation or position compensation generated by the pressurizing unit to maintain the target pressure holding state.

[0009] When the axial load response parameter is detected to reach the preset load transfer threshold, the screw-in action of the screw unit is stopped, and a pressure-locked mold assembly is obtained. The load transfer threshold is the critical value range in which the axial preload generated by the fastener can balance the rebound force of the solid electrolyte layer. The mold assembly is an assembly intermediate in which the fastener can independently bear the rebound force of the solid electrolyte layer.

[0010] The pressurization unit is controlled to remove external pressure from the mold assembly according to a preset curve to obtain the finished all-solid-state battery mold.

[0011] By adopting the above technical solution, the system controls the pressurizing unit to establish and maintain a constant target pressure state on the mold. During the fastener screwing process, by utilizing the physical relationship between the pressurizing unit and the fastener sharing the load, and by monitoring the load response changes generated by the pressurizing unit to maintain constant pressure, the system can more accurately capture the critical point where the axial preload of the fastener can completely balance the internal expansion force. This load-interaction-based control logic achieves seamless takeover of the internal pressure by the fastener before the external pressure is removed, ensuring the authenticity and accuracy of the molding pressure inside the all-solid-state battery mold.

[0012] In some embodiments, the step of controlling the pressurization unit to apply pressure to the all-solid-state battery mold along the axial direction until the target holding pressure state is reached specifically includes:

[0013] The pressurization unit is controlled to switch to a constant output force mode to continuously load the all-solid-state battery mold, thereby obtaining a constant pressure holding process.

[0014] During the constant pressure maintenance process, the derivative of the axial position change of the pressurizing unit is collected in real time to obtain the axial displacement rate;

[0015] When the axial displacement rate is detected to meet the preset creep convergence threshold, it is determined that the all-solid-state battery mold has reached the target pressure holding state.

[0016] By adopting the above technical solution, the system transforms simple pressure value judgment into dynamic monitoring of the mold forming state, continuously tracking the rate of change of axial position under a constant output force mode. By waiting for the axial displacement rate of the powder material inside the mold to converge to a small creep threshold, the system can identify and wait for the solid electrolyte layer to complete early material relaxation and structural rearrangement. This judgment method based on physical stability eliminates the pressure hysteresis effect caused by the viscoelasticity of the powder material, ensuring that subsequent locking operations are performed under the most stable state where the internal structure of the mold reaches stress equilibrium.

[0017] In some embodiments, prior to the step of detecting that the axial load response parameter has reached a preset load transfer threshold, the method further includes:

[0018] Obtain the material elastic modulus of the all-solid-state battery mold and the thread fit clearance parameters of the fasteners;

[0019] Based on the material's elastic modulus and the thread fit clearance parameters, the expected axial displacement loss at the instant the external pressure is removed is calculated, and the axial displacement loss is converted into the corresponding stress rebound compensation.

[0020] The stress rebound compensation is superimposed on the theoretical value that characterizes the rebound force balance point of the solid electrolyte layer to calculate the load transfer threshold that includes the interference locking requirement.

[0021] By employing the aforementioned technical solution, the system pre-establishes a physical model that includes material properties and mechanical fit clearances, quantifying the inevitable pressure loss caused by the elimination of thread clearances and slight material deformation upon removal of external pressure. By converting this foreseeable displacement loss into additional stress compensation added to the locking threshold, the system implements an interference-locking strategy during the pressurization phase. This mechanism ensures that after the mold assembly undergoes the unloading and springback process, the residual actual clamping pressure accurately returns to the theoretical target value, offsetting the impact of mechanical structure elasticity errors on test accuracy.

[0022] In some embodiments, the step of driving the screw-locking unit to screw the fastener into the all-solid-state battery mold while maintaining the target pressure-holding state specifically includes:

[0023] The screw-locking unit is controlled to screw the fastener in with a first axial tightening force until the axial load response parameter is detected to reach a preset switching threshold, which is less than the load transfer threshold.

[0024] The axial control mode of the screw-locking unit is switched to the floating follow mode. In the floating follow mode, the second axial clamping force applied by the screw-locking unit is reduced to the minimum contact force that keeps its drive end connected to the fastener in an effective torque transmission connection.

[0025] In the floating follow mode, the fastener is driven to screw in until the axial load response parameter is detected to reach the load transfer threshold.

[0026] By adopting the above technical solution, the system divides the screw-in process into two stages: rigid introduction and flexible torque transmission. It switches to a floating follow mode in the critical section where the fastener is about to bear the load. In this mode, the screw-locking unit outputs only the minimum contact force sufficient to maintain the connection, eliminating the interference of the axial clamping force of the external drive mechanism on load transmission monitoring. This decoupled control ensures that the monitored load response parameters purely reflect the mechanical interaction between the fastener and the die, improving the accuracy of capturing the critical point of load transfer while reducing the risk of mechanical damage during thread engagement.

[0027] In some embodiments, after the step of stopping the screw-in action of the locking screw unit to obtain a pressure-locked mold assembly, the method further includes:

[0028] The screw-locking unit is controlled to perform a slight retraction along the axial direction to remove the axial operating pressure applied by the screw-locking unit to the all-solid-state battery mold;

[0029] Collect the pressure recovery value of the pressurization unit after the micro-retraction action is performed, and determine whether the pressure recovery value exceeds the preset safety tolerance.

[0030] If the pressure exceeds the limit, it is determined that the fastener has not fully borne the rebound force of the solid electrolyte layer, and an additional screw-in angle is calculated based on the pressure rebound value, and the screw-locking unit is re-driven to perform compensatory screw-in.

[0031] By adopting the above technical solution, the system introduces a microscopic mechanical verification step after initial tightening. By removing the axial operating pressure of the screw-locking unit and observing the feedback from the pressurizing unit, a closed-loop quality detection mechanism is constructed. This detection action can sensitively identify whether the fastener has a "false lock" or is not fully loaded. Once abnormal pressure fluctuations are detected, a secondary correction is immediately performed based on physical feedback and calculated compensation angle. This ensures that every mold assembly coming off the production line has undergone actual load-bearing capacity verification, guaranteeing the consistency of the pressure-locked state.

[0032] In some embodiments, the step of controlling the pressurization unit to remove external pressure from the mold assembly according to a preset curve to obtain a finished all-solid-state battery mold specifically includes:

[0033] The pressurization unit is controlled to perform a stepped unloading action, which includes several sequentially decreasing pressure holding platforms.

[0034] During each pressure holding platform, the axial springback displacement of the all-solid-state battery mold is monitored, and the unloading stiffness of the pressurization unit at the current stage is calculated based on the axial springback displacement.

[0035] If the deviation between the unloading stiffness and the pre-stored theoretical tensile stiffness of the fastener is within a preset linear matching range, then the next stage of unloading action is executed until the external pressure is completely removed.

[0036] If a sudden change in the unloading stiffness or an excess of the linear matching range is detected, it is determined that the fastener has slipped and failed, and the pressurizing unit is controlled to immediately stop unloading and restore to the target pressure holding state.

[0037] By adopting the above technical solution, the system refines the high-pressure unloading process into a composite action of staged release and stiffness verification, dynamically calculating the real-time unloading stiffness of the system using the static rebound data of each pressure platform. By comparing the real-time stiffness with the theoretical linear tensile characteristics of the fastener, the system can sensitively detect nonlinear failure symptoms such as thread slippage or material yielding. This process monitoring mechanism enables the system to intervene in the early stages of structural failure of the mold by stopping unloading and repressurizing, effectively preventing the outflow of defective components and ensuring the safety of the testing process.

[0038] In some embodiments, prior to the step of controlling the pressurization unit to perform a stepped unloading action, the method further includes:

[0039] The pressurization unit is controlled to perform at least one stress breathing cycle on the mold assembly. The stress breathing cycle includes reducing the external pressure to a preset percentage of the target holding pressure state and then reloading to the overpressure fluctuation value that rises back to the target holding pressure state.

[0040] Monitor the screw-locking unit for changes in screw-in angle or torque decay before and after performing the stress breathing cycle;

[0041] If a change in the screw-in angle or a decrease in torque is detected, the screw-locking unit is driven to perform a second tightening while maintaining the overpressure fluctuation value.

[0042] By adopting the above technical solution, the system introduces a stress breathing cycle simulating actual working conditions before final unloading. This artificially created micro-fluctuations in pressure induce micro-settling between the internal components of the mold and the threaded mating surfaces. Monitoring changes in the locking state during this dynamic process breaks down the unstable contact state masked by static friction, exposing potential torque attenuation risks. A secondary tightening is then performed on the fluctuated state, improving the fit stability between the fasteners and the locked interface, further enhancing the pressure retention capability of the all-solid-state battery mold during long-term testing.

[0043] Secondly, this application provides an automated assembly system for testing batteries using all-solid-state molds. The system includes: a pressurizing unit, a screw-locking unit, and a control center communicatively connected to both the pressurizing unit and the screw-locking unit; the control center includes one or more processors and a memory.

[0044] The memory is coupled to the one or more processors. The memory is used to store computer program code, which includes computer instructions. The one or more processors call the computer instructions so that the control center can coordinate the pressurization unit and the screw-locking unit to realize the automated assembly method of the all-solid-state mold test battery provided in the above embodiment, which will not be described in detail here.

[0045] Thirdly, this application provides a computer-readable storage medium including instructions that, when executed on an automated assembly system for testing batteries using all-solid-state molds, enable the system to implement an automated assembly method for testing batteries using all-solid-state molds as described in the above embodiments, which will not be elaborated further here.

[0046] Fourthly, this application provides a computer program product, including a computer program / instructions, which, when run on an automated assembly system for all-solid-state mold test batteries, enables the system to implement an automated assembly method for all-solid-state mold test batteries provided in the above embodiments, which will not be elaborated here.

[0047] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0048] 1. The system abandons the traditional single-dimensional approach of relying solely on torque to determine the tightness, establishing a dynamic load correlation between the external pressurizing unit and the internal fasteners. Under the physical condition of maintaining constant mold pressure, the system uses the load response of the pressurizing unit (such as output force attenuation or position compensation) in real time to inversely deduce the actual axial preload of the fasteners, and combines this with a floating follow-up mode to eliminate interference from external driving forces. This control logic can more accurately capture the critical point at which the fasteners completely balance the rebound force of the internal solid electrolyte layer, achieving seamless transfer of pressure load from external equipment to the mold assembly itself. This solves the industry problem of a sharp drop in internal mold pressure upon removal of external force, ensuring the authenticity of the internal pressure of the battery after encapsulation.

[0049] 2. By monitoring the convergence of axial displacement rates, the system ensures that the powder material inside the mold completes structural rearrangement and stress relaxation before locking, eliminating the potential pressure hysteresis caused by viscoelasticity. Furthermore, it uses a computational model to predict the displacement loss caused by thread clearance and material springback at the moment of external pressure removal, converting this loss into stress compensation for "interference locking." This feedforward mechanism ensures that after the mold experiences inevitable mechanical springback, its residual pressure accurately returns to the theoretical target value, improving the repeatability of test data.

[0050] 3. The system induces micro-settling at the mating surfaces by artificially creating slight pressure fluctuations, coupled with a slight retraction action. This allows the system to proactively expose and eliminate "false locking" or torque attenuation phenomena in fasteners. Simultaneously, during unloading, by calculating system stiffness in real time and comparing it with the theoretical linear model, it can accurately identify precursors of nonlinear failures such as fastener slippage or material yielding. This dynamic verification mechanism ensures that every all-solid-state mold battery produced undergoes actual testing of its ultimate load-bearing capacity, guaranteeing mechanical safety and pressure stability during long-term testing. Attached Figure Description

[0051] Figure 1 This is a flowchart illustrating an automated assembly method for testing batteries using an all-solid-state mold, as described in an embodiment of this application.

[0052] Figure 2 This is another flowchart illustrating an automated assembly method for testing batteries using an all-solid-state mold, as described in this application.

[0053] Figure 3 This is a schematic diagram of the physical device structure of an automated assembly system for testing batteries using all-solid-state molds, as described in this application. Detailed Implementation

[0054] The terminology used in the following embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. As used in the specification and appended claims of this application, the singular expressions “a,” “an,” “the,” “the,” “the,” and “this” are intended to include the plural expressions as well, unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in this application refers to any or all possible combinations including one or more of the listed items.

[0055] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature, and in the description of the embodiments of this application, unless otherwise stated, "multiple" means two or more.

[0056] In the assembly process of all-solid-state mold test batteries, to ensure that the solid electrolyte layer inside the battery maintains a preset compaction density, simulates the high-pressure working environment of an actual battery stack, and thus guarantees the accuracy and repeatability of electrochemical test data, precise pressurization, locking, load transfer, and depressurization operations are required to achieve seamless transfer of pressure from external pressurization equipment to the mold fasteners, avoiding pressure loss inside the mold after the external pressure is removed. This application achieves automated assembly of all-solid-state mold test batteries through dynamic load monitoring and precise motion control, solving the problem of internal pressure runaway caused by torque dispersion in traditional assembly.

[0057] For ease of understanding, the method provided in this implementation is described in process below. Please refer to [link / reference]. Figure 1 This is a flowchart illustrating an automated assembly method for testing batteries using an all-solid-state mold, as described in an embodiment of this application.

[0058] S101, The pressurization unit applies pressure along the axial direction to the all-solid-state battery mold until the target pressure holding state is reached.

[0059] The pressurizing unit refers to the actuator in the system that applies axial pressure to the all-solid-state battery mold and maintains the pressure state; the axial direction refers to the axial direction that is consistent with the compaction direction of the all-solid-state battery mold; the target pressure holding state refers to the physical state in which the solid electrolyte layer inside the all-solid-state battery mold is compressed to a preset density and the pressurizing unit actively maintains a constant pressure.

[0060] This step is executed when the all-solid-state battery mold has completed powder material filling and entered the initial stage of assembly pressurization. Specifically, the system activates the pressurization unit, controlling it to apply pressure along the axial direction of the mold. During pressure application, the solid electrolyte layer and positive and negative electrode powder materials inside the mold are continuously compressed, gradually increasing the powder density. During pressurization, the system monitors the density change of the solid electrolyte layer inside the mold in real time, while controlling the pressurization unit to maintain stable pressure output until the density of the solid electrolyte layer reaches the preset value and the pressurization unit can actively maintain this pressure state. At this point, the mold is deemed to have reached the target holding pressure state, and the core action of the pressurization stage is completed. The key to this step is ensuring that the material inside the mold is compacted to the preset density and that the pressurization unit can stably maintain constant pressure.

[0061] In some embodiments, the system can first control the pressurizing unit to output axial pressure in a gradient-increasing manner, collect density data of the solid electrolyte layer inside the mold in real time, and when the density reaches a preset value, switch the pressurizing unit to constant pressure mode to continuously output constant pressure. At the same time, monitor the pressure fluctuation value of the pressurizing unit. When the pressure fluctuation value is within a preset small range, it is determined that the target pressure holding state has been reached.

[0062] S102. During the process of maintaining the target pressure state, drive the screw-locking unit to screw the fastener into the all-solid-state battery mold, and monitor the axial load response parameters of the pressurization unit in real time.

[0063] Among them, the screw-locking unit refers to the actuator in the system used to drive the fastener into the all-solid-state battery mold and realize the mold fastening; the fastener refers to the threaded connection used to lock the all-solid-state battery mold and can generate axial preload; the axial load response parameter refers to the parameter used to represent the amount of output force attenuation or position compensation generated by the pressurizing unit to maintain the target pressure state.

[0064] This step is executed when the system has successfully controlled the mold to the target pressure-holding state, and the pressurizing unit continues to maintain this state. It is the core transitional step for transferring the pressure load from the pressurizing unit to the fastener. Specifically, while maintaining constant pressure output from the pressurizing unit and the mold in the target pressure-holding state, the system activates the screw-locking unit. This unit drives the fastener to gradually screw into the threaded engagement position of the all-solid-state battery mold. During the screwing process, the fastener gradually generates axial preload, beginning to share the axial pressure applied by the pressurizing unit. Throughout this process, the system continuously and in real-time monitors the axial load response parameters of the pressurizing unit. As the fastener gradually bears the load, the output force required by the pressurizing unit to maintain constant pressure will decrease, or position compensation may be needed to maintain constant pressure. By capturing these parameter changes, the system accurately reflects the changes in the fastener's preload and the progress of load transfer. By capturing the load transfer dynamics in real-time through load response parameters, the system ensures that the monitoring data accurately reflects the actual load-bearing situation of the fastener.

[0065] In some embodiments, the system can control the screw-locking unit to drive the fastener into the mold at a constant torque rate. During the screwing process, the output force value of the pressure unit is collected at preset time intervals, and the difference between two adjacent collected values ​​is calculated to obtain the output force attenuation, which is used as an axial load response parameter. Optionally, the system can also control the screw-locking unit to drive the fastener into the mold at a constant screwing rate, collect the axial position data of the pressure unit in real time, compare it with the initial position of the pressure unit under the target pressure holding state, calculate the position offset, and obtain the position compensation, which is used as an axial load response parameter. It is understood that other methods can also be used to achieve fastener screwing and axial load response parameter monitoring, which are not limited here.

[0066] S103. When the axial load response parameter is detected to reach the preset load transfer threshold, the screw-in action of the screw unit is stopped, and a pressure-locked mold assembly is obtained.

[0067] Among them, the load transfer threshold refers to the critical range in which the axial preload generated by the fastener can balance the rebound force of the solid electrolyte layer; the mold assembly refers to the assembly intermediate in which the fastener can independently bear the rebound force of the solid electrolyte layer.

[0068] This step is executed when the system, during the execution of S102, detects in real-time that the axial load response parameters have reached a preset load transfer threshold. This is a crucial point in achieving complete load transfer from the pressurizing unit to the fasteners, signifying that the mold has completed pressure locking and entered a stable state before depressurization. Specifically, during continuous monitoring of the axial load response parameters, the system compares the real-time collected parameter values ​​with the preset load transfer threshold. When the parameter value falls within this critical range, it is determined that the axial preload generated by the fasteners is sufficient to completely balance the rebound force of the solid electrolyte layer inside the mold, and that the fasteners can independently bear this rebound force. At this point, the system immediately sends a stop command to the screw-locking unit, terminating the screw-in action of the fasteners. After the screw-in action stops, the pressure load of the mold is completely borne by the fasteners, and the external pressure of the pressurizing unit only serves as an auxiliary maintenance. At this point, the mold assembly with completed pressure locking is obtained.

[0069] In some embodiments, the system can pre-set the load transfer threshold as a critical range for the output force attenuation, and compare the collected output force attenuation with this range in real time. When the attenuation falls into the range, an electrical signal is immediately sent to the drive motor of the screw-locking unit to cut off the motor power supply and stop the fastener from screwing in. Optionally, the system can also pre-set the load transfer threshold as a critical range for the position compensation amount, and compare the collected position compensation amount with this range in real time. When the compensation amount falls into the range, a braking command is sent to the screw-locking unit, and the drive shaft is locked by the braking mechanism of the screw-locking unit to stop the fastener from screwing in. It is understood that other methods can also be used to achieve load transfer threshold determination and stopping the screwing action, which are not limited here.

[0070] S104. Control the pressurization unit to remove external pressure from the mold assembly according to the preset curve to obtain the finished all-solid-state battery mold.

[0071] Among them, the preset curve refers to the pressure change curve that is pre-set by the system to guide the pressurization unit to gradually remove external pressure; the all-solid-state battery mold finished product refers to the all-solid-state mold test battery finished product that can maintain the preset internal compaction density after completing pressure locking and external pressure removal.

[0072] This step is performed when the system has achieved pressure-locked mold components and the fasteners are capable of independently bearing the rebound force of the solid electrolyte layer. It is the final step in the automated assembly of the all-solid-state mold test battery, completing the removal of external pressure and obtaining the final product. Specifically, based on a pre-set pressure change curve, the system controls the pressurizing unit to gradually reduce the output axial pressure, removing external pressure from the mold components step by step according to the rhythm of the curve. During the removal process, since the mold components have been pressure-locked by the fasteners, the axial preload of the fasteners will continuously maintain the compacted state inside the mold, preventing the solid electrolyte layer from rebounding and expanding due to the removal of external pressure. After the pressurizing unit completes the removal of all external pressure according to the preset curve, the inside of the mold will stably maintain the preset compaction density and pressure state, at which point the all-solid-state battery mold product is obtained. The key to this step is to smoothly depressurize according to the preset curve, avoiding excessively rapid depressurization that would cause pressure fluctuations inside the mold, and ensuring that the fasteners can stably maintain the compacted state of the mold.

[0073] Optionally, the system can set the preset curve to a linear decreasing curve, controlling the pressurizing unit to gradually reduce the output pressure at a constant pressure drop rate, pausing at each preset pressure gradient to maintain pressure stability for a short period before continuing to reduce the pressure until it is completely removed. Alternatively, the system can set the preset curve to an exponential decreasing curve, controlling the pressurizing unit to reduce the pressure at a slower rate in the initial stage of depressurization, gradually accelerating the pressure drop rate in the later stage, and monitoring the axial deformation of the mold assembly in real time. If the deformation is within a preset range, depressurization continues according to the curve until the pressure is completely removed. It is understood that other methods can also be used to remove external pressure according to a preset curve; this is not limited here.

[0074] In the refined assembly process of all-solid-state mold testing batteries, while the basic steps S101 to S104 achieve the core actions of pressurization, locking, and depressurization, they struggle to address refined issues such as powder viscoelastic hysteresis, thread gap springback loss, locking drive force interference, and fastener mis-locking. This leads to insufficient pressure accuracy within the mold and poor repeatability of test data. Therefore, the system executes the refined steps S201 to S212. Through precise optimization of pressure holding determination, threshold calculation, and locking control, it upgrades from basic assembly to high-precision pressure locking, ensuring high consistency between the internal pressure of the mold and the target value, while mitigating failure risks such as fastener slippage and torque attenuation. Please refer to [link / reference] for details. Figure 2 This is another flowchart illustrating an automated assembly method for testing batteries using an all-solid-state mold, as described in this application.

[0075] S201, control the pressurization unit to switch to constant output force mode to continuously load the all-solid-state battery mold, and collect the derivative of the axial position change of the pressurization unit in real time during the constant pressure maintenance process to obtain the axial displacement rate.

[0076] Among them, the constant output force mode refers to the working mode in which the pressure unit maintains a constant axial pressure value and does not change with the deformation of the mold; the constant pressure holding process refers to the process in which the pressure unit continuously applies a constant axial pressure to the all-solid-state battery mold while in the constant output force mode; the derivative of axial position change is a physical quantity used to characterize the rate of change of the axial position of the pressure unit with time; the axial displacement rate is the amount of axial position change of the pressure unit per unit time, used to reflect the creep state of the powder material inside the mold.

[0077] This step is executed when the all-solid-state battery mold has completed powder filling and the system is about to start the initial stage of the pressurization and pressure holding process. Specifically, the system sends a mode switching command to the pressurization unit, switching it from the initial displacement-driven mode to a constant output force mode. The system then controls the pressurization unit to apply axial pressure to the all-solid-state battery mold in this mode and continues to load it, entering the constant pressure holding process. During this process, the system uses a high-precision position sensor to collect the axial position data of the pressurization unit in real time. The system performs differential calculations on the position data at fixed time intervals to obtain the derivative of the axial position change of the pressurization unit. This value is converted into an axial displacement rate that intuitively reflects the rate of position change. The trend of this rate is recorded in real time, providing data support for subsequent determination of the powder creep convergence state. The core of this step is to allow the powder inside the mold to fully creep through constant pressure loading and accurately capture the displacement change rate of the pressurization unit, reflecting the structural rearrangement state of the powder.

[0078] Optionally, the system can first send an electrical signal to the control module of the pressurizing unit, set its pressure control parameters to a constant value, complete the constant output force mode switching, and then control the pressurizing unit to load the mold with this constant pressure. The axial position data of the pressurizing unit is collected every 10 milliseconds by the laser displacement sensor, and the differential operation is performed on the three continuously collected data to obtain the position change derivative, which is converted into the axial displacement rate.

[0079] S202. When the axial displacement rate is detected to meet the preset creep convergence threshold, it is determined that the all-solid-state battery mold has reached the target pressure holding state.

[0080] The creep convergence threshold refers to a pre-set critical value for axial displacement rate. When the axial displacement rate reaches this value, it indicates that the creep process of the powder material inside the mold has basically ended and the structure has reached a stable state.

[0081] Specifically, the system continuously compares the real-time calculated axial displacement rate with a preset creep convergence threshold. This threshold is the critical value of the displacement rate after the powder material completes structural rearrangement and stress relaxation. When the axial displacement rate is detected to drop below this threshold and remain stable, it is determined that the creep process of the solid electrolyte layer and positive and negative electrode powder inside the mold has completely converged, and the powder material no longer undergoes significant axial deformation. At this time, the compaction density and stress state inside the mold have reached stability. Based on this, the system determines that the all-solid-state battery mold has reached the target pressure holding state, and then stops the dynamic determination of the axial displacement rate, maintaining the constant output force mode of the pressurizing unit to provide a stable physical state for subsequent locking operations.

[0082] Optionally, the system can set the creep convergence threshold to a fixed value and continuously compare the real-time axial displacement rate with this value. When the rate is lower than this value for 5 consecutive seconds, a pressure holding status confirmation signal is immediately sent to determine that the mold has reached the target pressure holding state.

[0083] S203. Based on the material elastic modulus of the all-solid-state battery mold and the thread fit clearance parameters of the fasteners, calculate the expected axial displacement loss at the moment of external pressure removal, and convert the axial displacement loss into the corresponding stress rebound compensation.

[0084] Among them, the material elastic modulus refers to the physical quantity that characterizes the ability of the all-solid-state battery mold body material to resist elastic deformation; the thread fit clearance parameter refers to the relevant parameters used to represent the size and uniformity of the gap between the fastener and the mold thread fit position; the axial displacement loss refers to the amount of axial displacement change caused by the elastic rebound of the mold material and the elimination of the thread fit clearance at the instant the external pressure is removed; the stress rebound compensation amount refers to the stress value after the axial displacement loss is transformed through the mechanical model, which is used to compensate for the pressure loss after the external pressure is removed.

[0085] Specifically, the system retrieves the pre-stored elastic modulus of the all-solid-state battery mold body material and the clearance parameters of the fasteners used in this assembly and the mold thread fit. Based on these two core parameters, combined with the physical model of material mechanics and mechanical fit, the system simulates and calculates the axial displacement change caused by the elastic deformation rebound of the mold material and the filling of the thread fit clearance at the instant the external pressure is removed, thus obtaining the axial displacement loss. Subsequently, based on the compaction characteristics of the solid electrolyte layer, the system calculates this axial displacement loss through the force-displacement conversion relationship, converting the displacement loss into the corresponding stress value, i.e., the stress rebound compensation amount. This compensation amount provides a quantitative basis for subsequent superposition to the theoretical threshold, avoiding the final internal pressure of the mold from falling below the target value due to displacement loss.

[0086] Optionally, the system can first retrieve the elastic modulus and thread fit clearance parameters of the mold material from the material parameter database, substitute them into the preset elastic rebound displacement calculation formula, calculate the axial displacement loss, and then multiply the displacement loss by the compaction stiffness according to the compaction stiffness of the solid electrolyte layer to obtain the stress rebound compensation.

[0087] S204. The stress rebound compensation is superimposed on the theoretical value that characterizes the balance point of the rebound force of the solid electrolyte layer, and the load transfer threshold including the interference locking requirement is calculated.

[0088] Among them, the theoretical value of the solid electrolyte layer rebound force balance point refers to the theoretical value of the axial load response parameter when the axial preload of the fastener can just completely balance the rebound force of the solid electrolyte layer; the interference locking requirement refers to the requirement that the fastener needs to generate additional preload to compensate for axial displacement loss, so as to achieve a locking requirement that exceeds the theoretical balance value; the load transfer threshold including the interference locking requirement refers to the critical value range of load transfer that can offset displacement loss and ensure that the pressure meets the standard after pressure relief after superimposing stress rebound compensation.

[0089] Specifically, the system retrieves the theoretical value of the axial load response parameter, which characterizes the equilibrium point of the solid electrolyte layer's rebound force, obtained through theoretical calculations. This value is the critical value at which the fastener preload and the electrolyte layer's rebound force are precisely balanced. The system then adds the stress rebound compensation amount obtained in S203 to this theoretical value according to the conversion rules of the axial load response parameter, performing a comprehensive calculation to ensure that the final threshold value includes the interference locking amount required to compensate for displacement loss. The load transfer threshold obtained through this calculation is no longer simply a theoretical equilibrium value, but rather a critical value range that takes into account mechanical rebound loss. This ensures that when the fastener is screwed into this threshold, its preload not only balances the rebound force but also offsets the displacement loss during pressure relief, allowing the final residual pressure inside the mold to accurately match the target value.

[0090] Optionally, the system can first convert the stress rebound compensation amount into an axial load response parameter compensation value with the same unit as the theoretical value, then add the compensation value to the theoretical value of the solid electrolyte layer rebound force balance point to obtain the basic threshold value, and then set a reasonable numerical fluctuation range according to the process requirements to form a load transfer threshold range that includes the interference locking requirement.

[0091] S205. The control screw-locking unit screws the fastener in with the first axial tightening force until the axial load response parameter is detected to reach the preset switching threshold.

[0092] Among them, the first axial clamping force refers to the large axial clamping force applied by the screw-locking unit in the initial stage of screwing in to ensure that the fastener is smoothly introduced into the thread and achieves rigid screwing in; the switching threshold refers to the pre-set critical value of the axial load response parameter, which is less than the load transfer threshold, and is the basis for determining whether the screw-locking unit switches from rigid screwing in to floating follow-screwing in.

[0093] Specifically, the system sends an axial clamping force setting command to the screw-locking unit, setting the initial axial clamping force as the first axial clamping force. This clamping force is sufficient to allow the fastener's threads to smoothly enter the threaded engagement position of the mold, avoiding stripping or jamming during the initial screwing process. The system then controls the screw-locking unit to use this clamping force to drive the fastener into the mold. During screwing, the system continuously monitors the axial load response parameters of the pressure unit in real time and compares them with a preset switching threshold. As the fastener gradually screws in and begins to bear some load, the axial load response parameters continuously change. The system maintains this screwing state until the axial load response parameters reach the switching threshold. At this point, the fastener has completed rigid insertion and is about to enter the critical screwing stage requiring precise load monitoring, preparing for subsequent mode switching.

[0094] Optionally, the system can first set the value of the first axial tightening force through the pressure adjustment module of the screw unit, start the screw-in drive motor to drive the fastener to screw in at a constant speed, monitor the axial load response parameters in real time through the pressure sensor, continuously compare them with the preset switching threshold value, and when the monitored value reaches the threshold, send a command to pause screwing in, and prepare for mode switching.

[0095] S206. Switch the axial control mode of the screw-locking unit to the floating follow mode, and continue to drive the fastener to screw in in the floating follow mode until the axial load response parameter is detected to reach the load transfer threshold.

[0096] Among them, the floating follow mode refers to the axial control of the screw unit being in a flexible mode without rigid clamping and only maintaining minimum contact force, and its drive end can float axially with the slight deformation of the mold; the second axial clamping force refers to the minimum axial contact force applied by the screw unit in the floating follow mode to maintain the effective torque transmission connection between the drive end and the fastener; the effective torque transmission connection refers to the connection state between the drive end of the screw unit and the fastener, which can ensure that the torque is transmitted from the drive end to the fastener without loss.

[0097] Specifically, after detecting that the axial load response parameter has reached the switching threshold, the system immediately sends a mode switching command to the screw-locking unit, switching it from the rigid clamping axial control mode to the floating follow mode. Simultaneously, the axial clamping force is reduced from the first axial clamping force to the second axial clamping force. This clamping force only maintains contact between the drive end and the fastener, ensuring normal torque transmission without applying additional axial rigid pressure to the mold, thus eliminating interference from the screw-locking unit's axial driving force on the pressure unit's load monitoring. Subsequently, the system controls the screw-locking unit to continue driving the fastener in this mode. Since there is no additional clamping force interference, the axial load response parameter monitored by the pressure unit purely reflects the actual preload of the fastener and the mechanical interaction inside the mold. The system continues to monitor this parameter until it reaches the load transfer threshold calculated in S204, which includes the interference clamping requirement. At this point, the fastener's preload has met the requirements of balancing the springback force and compensating for displacement loss.

[0098] Optionally, the system can first send a pressure relief command to the axial actuator of the screw-locking unit to reduce the axial clamping force to a preset second axial clamping force, then start the control program of the floating follow mode to release the axial rigid positioning, and then control the screw-in drive motor to continue screwing in the fastener at a low speed, collect the axial load response parameters in real time and compare them with the load transfer threshold, and stop screwing when the threshold is reached.

[0099] S207. Control the screw-locking unit to perform a slight retraction action along the axial direction, and collect the pressure recovery value of the pressurizing unit after the slight retraction action is performed.

[0100] Among them, the micro-retraction action refers to the drive end of the screw unit making a very small retraction movement along the axial direction away from the all-solid-state battery mold. The retraction distance is based on removing only the axial operating pressure without changing the pre-tightening state of the fastener. The axial operating pressure refers to the additional axial pressure applied to the mold by the screw unit during the screwing of the fastener, which is not the pre-tightening force of the fastener itself. The pressure recovery value refers to the pressure recovery value output by the pressure unit to maintain the target pressure state after the screw unit performs the micro-retraction action, which is used to reflect the actual load-bearing situation of the fastener.

[0101] Specifically, the system sends a slight axial retraction command to the screw-locking unit, controlling its drive end to retract a very small distance axially. This retraction action only eliminates the rigid clamping between the screw-locking unit and the mold and fastener, removing the axial operating pressure generated during screwing in. It does not loosen the preload of the fastener, nor does it change the pressure balance inside the mold. After completing the slight retraction action, the system immediately uses the pressure detection module of the pressurizing unit to accurately collect the numerical change of the output pressure of the pressurizing unit, obtaining the pressure recovery value. This value is the core basis for judging whether the fastener has truly borne the rebound force of the solid electrolyte layer. If the fastener has not fully borne the force, the output pressure of the pressurizing unit will show a significant recovery after the axial operating pressure is removed.

[0102] In some embodiments, the system can first set a fixed micro-retraction distance according to the specifications of the fastener, send a reverse command with the corresponding number of pulses to the drive motor of the screw-locking unit, control the motor to drive the drive end to complete the retraction, and then trigger the pressure sensor of the pressurizing unit to perform a single high-precision pressure acquisition, and compare it with the pressure value before retraction to obtain the pressure recovery value.

[0103] S208. If the pressure rise value exceeds the preset safety tolerance, calculate the additional screw-in angle based on the pressure rise value and re-drive the screw-locking unit to perform compensatory screw-in.

[0104] Among them, the safety tolerance refers to the critical range of pressure rebound value preset by the system. If the pressure rebound value is within this range, it is determined that the fastener has fully borne the rebound force and the locking state is qualified. The additional screw-in angle refers to the angle that the system calculates based on the pressure rebound value exceeding the safety tolerance through a mechanical model, which is used to compensate for the insufficient preload of the fastener. The compensation screw-in refers to the secondary screw-in action performed by the screw-locking unit on the fastener according to the calculated additional screw-in angle, in order to increase the axial preload of the fastener and enable it to fully bear the rebound force of the solid electrolyte layer.

[0105] Specifically, the system compares the collected pressure rebound value with the preset safety tolerance. If the pressure rebound value does not exceed the tolerance, it is determined that the fastener has fully borne the rebound force of the solid electrolyte layer, the locking state of the mold assembly is qualified, and it directly proceeds to the next process. If the pressure rebound value exceeds the safety tolerance, it is determined that the fastener has a "virtual lock" problem due to insufficient preload, and has not fully borne the rebound force. At this time, the system will calculate the additional screw-in angle that needs to be compensated for the pressure difference based on the pressure rebound value, combined with parameters such as the thread lead of the fastener and the force characteristics of the mold, through a mechanical conversion model. Subsequently, the system sends a compensation screw-in command to the screw-locking unit, controlling it to drive the fastener to continue screwing in according to the calculated additional screw-in angle in a floating follow mode until the screw-in action of the entire additional angle is completed, so that the preload of the fastener can completely balance the rebound force of the solid electrolyte layer and eliminate the "virtual lock" risk.

[0106] In some embodiments, the system can first substitute the difference between the pressure recovery value and the safety tolerance into a preset angle conversion formula to directly calculate the additional screw-in angle, send a corresponding angle screw-in command to the screw-locking unit, control it to complete the compensation screw-in at a constant low speed, and after the screw-in is completed, perform a slight retraction action again to verify the locking state.

[0107] S209. Control the pressurization unit to perform at least one stress breathing cycle on the mold assembly. If the screw-locking unit shows a change in screw-in angle or torque decay before and after the stress breathing cycle, drive the screw-locking unit to perform a second tightening while maintaining the overpressure fluctuation value.

[0108] Among them, stress breathing cycle refers to a pressure fluctuation cycle in which the pressurizing unit first reduces and then increases the external pressure applied to the mold assembly, which is used to induce micro-settling between the internal components of the mold and the threaded mating surface; preset percentage refers to the proportion of the pressure reduction value to the target holding pressure value, which is a non-zero value and less than 100%; overpressure fluctuation value refers to the pressure value that exceeds the target holding pressure value after the pressure rebounds, which is used to maintain the compaction state of the mold assembly; screw-in angle change refers to the slight deviation of the screw-in angle of the fastener before and after the stress breathing cycle; torque attenuation refers to the decrease in torque between the screw-locking unit and the fastener before and after the stress breathing cycle; secondary tightening refers to the re-tightening action of the screw-locking unit on the fastener when the mold assembly is under the holding pressure state of overpressure fluctuation value, which is used to eliminate the loosening of the lock caused by micro-settling.

[0109] Specifically, the system controls the pressurization unit to begin executing a stress breathing cycle. First, the external pressure is reduced from the target holding pressure value to the pressure value corresponding to a preset percentage. After stabilizing for a short period, the pressure is then increased back to the overpressure fluctuation value corresponding to the target holding pressure state and stabilized, completing one cycle. If higher process requirements are needed, this cycle can be repeated multiple times. Before and after each cycle, the system monitors the fastener screwing angle and torque values ​​corresponding to the screw-locking unit using angle and torque sensors, respectively, comparing whether there are changes in the screwing angle or torque attenuation. If relevant changes are detected, it indicates that pressure fluctuations have induced micro-settling of the internal components and threaded mating surfaces of the mold, causing slight loosening of the fasteners. At this time, while maintaining the overpressure fluctuation value holding pressure, the system sends a secondary tightening command to the screw-locking unit, controlling it to slowly tighten the fasteners until the torque and angle return to a stable state, eliminating the locking hazard caused by micro-settling.

[0110] S210: Control the pressurization unit to perform a stepped unloading action. During each pressure holding platform, monitor the axial springback displacement of the all-solid-state battery mold and calculate the unloading stiffness of the pressurization unit at the current stage based on the axial springback displacement.

[0111] Among them, the stepped unloading action refers to the pressure reduction action of the pressurizing unit gradually and in stages from the overpressure fluctuation value to zero, and each stage is a combination of pressure holding and pressure reduction; the pressure holding platform refers to the period of time during which the pressure value is maintained stable after the pressure drop in each pressure reduction stage during the stepped unloading process, which is used to monitor the springback state of the mold; the axial springback displacement refers to the small axial springback displacement value of the all-solid-state battery mold due to the pressure reduction during each pressure holding platform period; the unloading stiffness refers to the ratio of the pressure change of the pressurizing unit to the axial springback displacement of the mold in the current pressure reduction stage, which is used to reflect the overall load-bearing characteristics of the current mold assembly.

[0112] Specifically, the system sends a stepped unloading command to the pressurization unit, controlling it to depressurize in multiple stages starting from the current overpressure fluctuation value. In each stage, the pressure is first reduced to a specified value according to a preset gradient, then enters a pressure holding platform to maintain pressure stability. During each pressure holding platform, the system uses a high-precision displacement sensor to monitor the axial position change of the all-solid-state battery mold in real time, accurately collecting the axial springback displacement within that time period, and simultaneously recording the pressure change value for that stage. Then, based on stiffness calculation logic, the system calculates the ratio between the pressure change value of that stage and the collected axial springback displacement value to obtain the unloading stiffness of the pressurization unit at the current stage. This value directly reflects the load-bearing state of the fasteners in the current mold assembly and the springback characteristics of the mold.

[0113] In some embodiments, the system can divide the depressurization process into a fixed number of pressure stages, set the same pressure drop gradient for each stage, control the pressurization unit to complete the depressurization according to the gradient and enter the pressure holding platform, collect the axial rebound displacement after holding on each platform for a fixed time, and use the ratio of the fixed pressure gradient value to the displacement as the unloading stiffness of the current stage.

[0114] S211. If the deviation between the unloading stiffness and the pre-stored theoretical tensile stiffness of the fastener is within the preset linear matching range, then the next stage of unloading action is executed until the external pressure is completely removed.

[0115] Among them, the theoretical tensile stiffness of the fastener refers to the stiffness value of the fastener under tension, which is obtained by the system through theoretical calculation based on the fastener's material, specifications, size and other parameters, reflecting the ideal load-bearing characteristics of the fastener; the deviation value refers to the numerical difference between the unloading stiffness calculated at the current stage and the theoretical tensile stiffness of the fastener; the linear matching interval refers to the deviation value range preset by the system. If the deviation value is within this range, the current load-bearing state of the mold assembly is determined to be normal and the fastener has not undergone nonlinear deformation; the complete removal of external pressure means that the pressurizing unit reduces the axial pressure applied to the mold assembly to zero, completing the entire pressure relief action.

[0116] Specifically, the system compares the unloading stiffness calculated in the current stage with the pre-stored theoretical tensile stiffness of the fastener, calculates the deviation between the two, and then compares this deviation with a preset linear matching interval. If the deviation is within this linear matching interval, it indicates that the overall load-bearing characteristics of the current mold assembly match the ideal tensile characteristics of the fastener, the fastener is in a normal linear tensile state, and no slippage, yielding, or other failure issues have occurred. The springback state of the mold is also within the normal range. At this point, the system determines that there are no abnormalities in the current depressurization stage and sends a continued depressurization command to the pressurization unit, controlling it to execute the next stage of stepped unloading action. The above pressure holding, displacement monitoring, and stiffness calculation steps are repeated until all depressurization stages are completed, the external pressure is completely removed, and the all-solid-state battery mold product is obtained.

[0117] S212. If a sudden change in unloading stiffness or exceeding the linear matching range is detected, it is determined that the fastener has slipped and failed, and the pressurization unit is controlled to immediately stop unloading and restore to the target pressure holding state.

[0118] Among them, sudden change in unloading stiffness refers to an irregular and large numerical change in the unloading stiffness of the current stage compared with the unloading stiffness of the previous stage, deviating from the normal linear change trend; slip failure refers to the fastener experiencing slight axial slippage at the threaded mating position due to the tensile force exceeding its friction limit, resulting in a significant decrease in its preload and inability to maintain the compaction state of the mold; restoration to the target holding pressure state means that the pressurizing unit immediately stops the unloading action and quickly restores the external pressure from the current value to the pressure value of the target holding pressure state, reapplying constant pressure to the mold assembly to prevent a significant loss of internal pressure in the mold.

[0119] Specifically, after calculating and comparing the unloading stiffness of the current stage, the system simultaneously monitors the trend of unloading stiffness changes. If the deviation value of the unloading stiffness exceeds the preset linear matching range, or if there is a significant sudden change compared to the unloading stiffness of the previous stage, it indicates that the fastener can no longer maintain a normal linear tensile state, and it is determined that slippage failure has occurred. At this time, the system immediately triggers the emergency handling procedure. First, it sends a stop depressurization command to the pressurization unit to terminate the current stepped unloading action. Then, it sends a pressure recovery command to control the pressurization unit to quickly and smoothly recover the external pressure from the current depressurization value to the pressure value of the target holding pressure state, and switches back to the constant output force mode to maintain the target holding pressure state. This prevents the solid electrolyte layer inside the mold from rebounding significantly due to fastener slippage, which would cause serious pressure loss inside the mold and provide a stable pressure foundation for subsequent troubleshooting and re-tightening.

[0120] The automated assembly system for testing batteries using all-solid-state molds, as described in this invention, is an electronic device. Figure 3 A schematic diagram of the architecture of an electronic device suitable for implementing embodiments of the present invention is shown.

[0121] It should be noted that, Figure 3 The electronic device shown is merely an example and should not be construed as limiting the functionality and scope of use of the embodiments of the present invention.

[0122] Those skilled in the art will understand that all or part of the steps in the various methods of the above embodiments can be implemented by instructions (computer programs), or by instructions (computer programs) controlling related hardware. These instructions can be stored in a computer-readable storage medium and loaded and executed by a processor. The electronic device of this embodiment includes a storage medium and a processor, wherein the storage medium stores multiple instructions that can be loaded by the processor to execute any step of the method provided in the embodiments of the present invention.

[0123] Specifically, the storage medium and the processor are electrically connected directly or indirectly to enable data transmission or interaction. For example, these components can be electrically connected to each other via one or more signal lines. The storage medium stores computer-executable instructions that implement data access control methods, including at least one software functional module that can be stored in the storage medium in the form of software or firmware. The processor executes various functional applications and data processing by running the software program and module stored in the storage medium. The storage medium can be, but is not limited to, Random Access Memory (RAM), Read-Only Memory (ROM), Programmable Read-Only Memory (PROM), Erasable Programmable Read-Only Memory (EPROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), etc. The storage medium stores the program, and the processor executes the program after receiving the execution instructions.

[0124] Furthermore, the software programs and modules within the aforementioned storage medium may also include an operating system, which may include various software components and / or drivers for managing system tasks (e.g., memory management, storage device control, power management, etc.) and can communicate with various hardware or software components to provide an operating environment for other software components. The processor may be an integrated circuit chip with signal processing capabilities. The aforementioned processor may be a general-purpose processor, including a Central Processing Unit (CPU), a Network Processor (NP), etc., which can implement or execute the methods, steps, and logic flowcharts disclosed in this embodiment. The general-purpose processor may be a microprocessor or any conventional processor.

[0125] Since the instructions stored in the storage medium can execute the steps in any of the methods provided in the embodiments of the present invention, the beneficial effects of any of the methods provided in the embodiments of the present invention can be achieved, as detailed in the preceding embodiments, and will not be repeated here.

[0126] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An automated assembly method for testing batteries using all-solid-state molds, applied to an automated assembly system for testing batteries using all-solid-state molds, the system comprising a pressurizing unit, an all-solid-state battery mold, and a screw-locking unit, characterized in that, The method includes: The pressurizing unit applies pressure to the all-solid-state battery mold along the axial direction until the target pressure holding state is reached. The target pressure holding state is the physical state in which the solid electrolyte layer inside the all-solid-state battery mold is compressed to a preset density and the pressurizing unit actively maintains a constant pressure. During the process of maintaining the target pressure holding state, the drive screw unit screws the fastener into the all-solid-state battery mold, and monitors the axial load response parameters of the pressurizing unit in real time. The axial load response parameters include the amount of output force attenuation or position compensation generated by the pressurizing unit to maintain the target pressure holding state. The step of driving the screw unit to screw the fastener into the all-solid-state battery mold during the process of maintaining the target pressure holding state includes: The screw-locking unit is controlled to screw the fastener in with a first axial tightening force until the axial load response parameter is detected to reach a preset switching threshold, which is less than a preset load transfer threshold. The axial control mode of the screw-locking unit is switched to the floating follow mode. In the floating follow mode, the second axial clamping force applied by the screw-locking unit is reduced to the minimum contact force that maintains an effective torque transmission connection between its drive end and the fastener. In the floating follow mode, the fastener is continued to be screwed in until the axial load response parameter is detected to reach the load transfer threshold. When the axial load response parameter is detected to reach the preset load transfer threshold, the screw-in action of the screw unit is stopped, and a pressure-locked mold assembly is obtained. The load transfer threshold is the critical value range in which the axial preload generated by the fastener can balance the rebound force of the solid electrolyte layer. The mold assembly is an assembly intermediate in which the fastener can independently bear the rebound force of the solid electrolyte layer. The pressurization unit is controlled to remove external pressure from the mold assembly according to a preset curve to obtain the finished all-solid-state battery mold.

2. The method according to claim 1, characterized in that, The step of the control pressurization unit applying pressure along the axial direction to the all-solid-state battery mold until the target holding pressure state is reached specifically includes: The pressurization unit is controlled to switch to a constant output force mode to continuously load the all-solid-state battery mold, thereby obtaining a constant pressure holding process. During the constant pressure maintenance process, the derivative of the axial position change of the pressurizing unit is collected in real time to obtain the axial displacement rate; When the axial displacement rate is detected to meet the preset creep convergence threshold, it is determined that the all-solid-state battery mold has reached the target pressure holding state.

3. The method according to claim 1, characterized in that, Before the step of detecting that the axial load response parameter has reached a preset load transfer threshold, the method further includes: Obtain the material elastic modulus of the all-solid-state battery mold and the thread fit clearance parameters of the fasteners; Based on the material's elastic modulus and the thread fit clearance parameters, the expected axial displacement loss at the instant the external pressure is removed is calculated, and the axial displacement loss is converted into the corresponding stress rebound compensation. The stress rebound compensation is superimposed on the theoretical value that characterizes the rebound force balance point of the solid electrolyte layer to calculate the load transfer threshold that includes the interference locking requirement.

4. The method according to claim 1, characterized in that, After the step of stopping the screw-in action of the locking screw unit to obtain a pressure-locked mold assembly, the method further includes: The screw-locking unit is controlled to perform a slight retraction along the axial direction to remove the axial operating pressure applied by the screw-locking unit to the all-solid-state battery mold; Collect the pressure recovery value of the pressurization unit after the micro-retraction action is performed, and determine whether the pressure recovery value exceeds the preset safety tolerance. If the pressure exceeds the limit, it is determined that the fastener has not fully borne the rebound force of the solid electrolyte layer, and an additional screw-in angle is calculated based on the pressure rebound value, and the screw-locking unit is re-driven to perform compensatory screw-in.

5. The method according to claim 4, characterized in that, The step of controlling the pressurization unit to remove external pressure from the mold assembly according to a preset curve to obtain the finished all-solid-state battery mold specifically includes: The pressurization unit is controlled to perform a stepped unloading action, which includes several sequentially decreasing pressure holding platforms. During each pressure holding platform, the axial springback displacement of the all-solid-state battery mold is monitored, and the unloading stiffness of the pressurization unit at the current stage is calculated based on the axial springback displacement. If the deviation between the unloading stiffness and the pre-stored theoretical tensile stiffness of the fastener is within a preset linear matching range, then the next stage of unloading action is executed until the external pressure is completely removed. If a sudden change in the unloading stiffness or an excess of the linear matching range is detected, it is determined that the fastener has slipped and failed, and the pressurizing unit is controlled to immediately stop unloading and restore to the target pressure holding state.

6. The method according to claim 5, characterized in that, Prior to the step of controlling the pressurization unit to perform the stepped unloading action, the method further includes: The pressurization unit is controlled to perform at least one stress breathing cycle on the mold assembly. The stress breathing cycle includes reducing the external pressure to a preset percentage of the target holding pressure state and then reloading to the overpressure fluctuation value that rises back to the target holding pressure state. Monitor the screw-locking unit for changes in screw-in angle or torque decay before and after performing the stress breathing cycle; If a change in the screw-in angle or a decrease in torque is detected, the screw-locking unit is driven to perform a second tightening while maintaining the overpressure fluctuation value.

7. An automated assembly system for testing batteries using all-solid-state molds, characterized in that, The system includes: a pressurizing unit, a screw-locking unit, and a control center communicatively connected to both the pressurizing unit and the screw-locking unit; the control center includes one or more processors and a memory. The memory is coupled to the one or more processors, the memory being used to store computer program code, the computer program code including computer instructions, the one or more processors invoking the computer instructions to cause the control center to coordinately control the pressurizing unit and the screw-locking unit to perform the method as described in any one of claims 1-6.

8. A computer-readable storage medium comprising instructions, characterized in that, When the instructions are run on an automated assembly system for testing batteries in all-solid-state molds, the system causes the system to perform the method as described in any one of claims 1-6.

9. A computer program product comprising a computer program / instructions, characterized in that, When the computer program / instructions are run on an automated assembly system for testing batteries in all-solid-state molds, the system causes the system to perform the method as described in any one of claims 1-6.

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