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CN-122025887-A - Solid-state battery interface evolution prediction and active regulation method, system, medium and product

CN122025887ACN 122025887 ACN122025887 ACN 122025887ACN-122025887-A

Abstract

The application relates to the field of battery management and state monitoring, and discloses a solid-state battery interface evolution prediction and active regulation method, a system, a medium and a product. The method comprises the steps of obtaining an interface mechanical signal and an electrochemical impedance characteristic in the running process of the solid-state battery, decomposing the electrochemical impedance characteristic to obtain a first impedance component and a second impedance component, combining the interface mechanical signal and the first impedance component to identify an interface mechanical failure or identify an interface electrochemical failure according to the second impedance component, executing at least one regulation strategy based on the identified failure type, wherein if the interface mechanical failure occurs, a pressure regulation signal is generated to drive an external mechanism to regulate the constraint force born by the battery, and if the interface electrochemical failure occurs, a pulse regulation signal is generated to inhibit interface side reaction or dendrite growth. The method can at least solve the technical problems that in the related art, the interface impedance is continuously increased and dendrite growth cannot be effectively inhibited.

Inventors

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  • Request for anonymity

Assignees

  • 绿态宇能(上海)能源科技有限公司

Dates

Publication Date
20260512
Application Date
20260413

Claims (10)

  1. 1. A solid-state battery interface evolution prediction and active regulation method, characterized in that the method comprises: Acquiring interface mechanical signals and electrochemical impedance characteristics in the running process of the solid-state battery; Decomposing the electrochemical impedance characteristic to obtain a first impedance component and a second impedance component, wherein the first impedance component represents a physical contact state and the second impedance component represents an interface reaction state; identifying an interface mechanical failure by combining the interface mechanical signal and the first impedance component, or identifying an interface electrochemical failure according to the second impedance component; And executing at least one regulation strategy based on the identified failure type, namely generating a pressure regulation signal to drive an external mechanism to regulate the constraint force born by the battery if the interface mechanical type fails, and generating a pulse regulation signal to inhibit interface side reaction or dendrite growth if the interface electrochemical type fails.
  2. 2. The method of claim 1, wherein the acquiring the interfacial mechanical signal during operation of the solid-state battery comprises: Acquiring interface expansion force data in charge-discharge cycles through an array type film pressure sensor arranged on the surface of a battery monomer, and taking the interface expansion force data as the interface mechanical signal; The decomposing the electrochemical impedance feature to obtain a first impedance component and a second impedance component includes: mapping the dynamic electrochemical impedance spectrum from a frequency domain to a time scale domain by adopting a relaxation time distribution analysis algorithm; And in the time scale domain, identifying characteristic peaks according to a preset time threshold, identifying characteristic peaks with time constants below the preset time threshold as the first impedance component, and identifying characteristic peaks with time constants above the preset time threshold as the second impedance component.
  3. 3. The method of claim 2, wherein the combining the interface mechanical signal and the first impedance component identifies an interface mechanical class failure, comprising: Calculating a first derivative of the interfacial expansion force data along with the change of the state of charge according to the interfacial mechanical signal to obtain an expansion respiration rate; If the expansion respiration rate is monitored to be lower than a preset standard respiration curve and the first impedance component is synchronously monitored to rise in a step-type manner, determining that physical delamination occurs at the interface, and determining that the interface mechanical type fails.
  4. 4. The method of claim 2, wherein said identifying an interfacial electrochemical-like failure from said second impedance component comprises: Monitoring the characteristic frequency offset of the second impedance component in a low-frequency diffusion controlled region, wherein the frequency of the low-frequency diffusion controlled region is smaller than or equal to a frequency domain region of 1 Hz; And if the inductive loop characteristic appears in the low-frequency diffusion controlled area or the gradient of the Warburg impedance exceeds a preset proportion relative to the descending amplitude of the initial circulation state, judging that the lithium dendrite nucleation or dead lithium accumulation risk exists at the interface, and determining that the electrochemical failure of the interface exists.
  5. 5. The method of claim 1, wherein the generating a pressure adjustment signal comprises: calculating a required pressure compensation value by using a PID control algorithm according to the deviation between the current value of the first impedance component and the health reference value; The pressure compensation value is converted into a driving command of a variable pressure mechanism, and a non-uniform gradient pressure is applied to the battery to adapt to the volume expansion non-uniformity of the electrode material at the interface.
  6. 6. The method of any one of claims 1 to 5, wherein generating the pulse modulation signal comprises: determining the frequency and duty cycle of the pulse current according to the ambient temperature and the second impedance component; And inserting a microsecond-level negative discharge pulse in the charging period, wherein the current density of the negative discharge pulse is higher than the current charging current density, and the amplitude of the current density is positively correlated with the electrochemical failure degree of the interface represented by the second impedance component and is used for generating a reverse electric driving force to dissolve a high-curvature lithium deposition point at the interface.
  7. 7. The method of claim 6, wherein the method further comprises: When the ambient temperature is lower than a preset threshold value, driving a variable pressure mechanism to apply auxiliary pulsation pressure synchronous with pulse frequency while executing the negative discharge pulse; The interface ion conductivity is improved by utilizing the local frictional heat of the interface induced by the pulsating pressure and the internal Joule heat generated by the pulse current, so that the continuity of the ion transmission channel is restored.
  8. 8. A solid-state battery management system, comprising: One or more processors, and A memory storing computer program instructions that, when executed, cause the processor to perform the steps of the method of any one of claims 1 to 7 to effect active regulation of a solid state battery interface.
  9. 9. A computer readable medium having stored thereon a computer program/instruction, which when executed by a processor, implements the steps of the method according to any of claims 1 to 7.
  10. 10. A computer program product comprising computer programs/instructions which, when executed by a processor, implement the steps of the method of any of claims 1 to 7.

Description

Solid-state battery interface evolution prediction and active regulation method, system, medium and product Technical Field The application relates to the technical field of battery management and state monitoring, in particular to a solid-state battery interface evolution prediction and active regulation method, a system, a medium and a product. Background The solid-state battery is used as the next-generation high-energy-density and high-safety energy storage technology, and the development of the solid-state battery has important significance for the improvement of the endurance mileage of the electric automobile and the reliability of an energy storage system. Solid-state batteries are increasingly one of the most potential directions recognized by the industry on the way to pursue higher performance. However, solid-state batteries still face serious challenges in practical applications. The existing liquid electrolyte battery has good interface contact, but after the solid electrolyte is replaced, the contact mode between the anode and the cathode and the solid electrolyte is radically changed, so that serious physical and chemical mismatch is easy to occur at the interface. This mismatch is not due solely to differences in material hardness, but rather to the fact that the solid state electrolyte does not have a consistent magnitude of volume change with the electrode material during charge and discharge, while the ion transport channels are difficult to maintain continuous free at the interface region. These problems cause the battery to quickly decay in performance during recycling, far from reaching the level of stability required for commercialization. In a further layer, the structure and composition of the interface layer formed between the solid electrolyte and the electrode continuously evolve under the repeated charge and discharge conditions. The interface formed at first may have a certain ion conduction capability, but as lithium ions are repeatedly intercalated and deintercalated, side reaction products are gradually accumulated at the interface, and the products block normal migration paths of lithium ions, initiate local electron conduction, and finally cause dendrite growth and even internal short circuit. Particularly, under high-rate charge and discharge or low-temperature environment, the negative effect of the interface instability is obviously amplified, so that the capacity of the battery is rapidly lost, the internal resistance is rapidly increased, and even potential safety hazards appear. However, the inventor finds that at least the following technical problems exist in the related art that the existing solid-state battery monitoring and controlling means are difficult to accurately decouple and identify the mechanical contact and electrochemical reaction failure of the interface, and an active closed-loop intervention mechanism is lacking, so that the interface impedance is continuously increased and the dendrite growth cannot be effectively inhibited. Disclosure of Invention An objective of the present application is to provide a method, a system, a medium and a product for predicting and actively controlling the interface evolution of a solid-state battery, at least to solve the technical problems that in the related art, the existing solid-state battery monitoring and controlling means are difficult to accurately decouple and identify the mechanical contact and electrochemical reaction failure of the interface, and the interface impedance is continuously increased and dendrite growth cannot be effectively inhibited due to lack of an active closed-loop intervention mechanism. To achieve the above object, some embodiments of the present application provide the following aspects: In a first aspect, some embodiments of the present application provide a method for predicting and actively regulating the interfacial evolution of a solid-state battery, the method comprising obtaining an interfacial mechanical signal and an electrochemical impedance characteristic during operation of the solid-state battery, decomposing the electrochemical impedance characteristic to obtain a first impedance component and a second impedance component, wherein the first impedance component characterizes a physical contact state and the second impedance component characterizes an interfacial reaction state; And executing at least one regulation strategy based on the identified failure type, namely generating a pressure regulation signal to drive an external mechanism to regulate the constraint force born by the battery if the interface mechanical type fails, and generating a pulse regulation signal to inhibit interface side reaction or dendrite growth if the interface electrochemical type fails. In a second aspect, some embodiments of the present application also provide a solid state battery management system comprising one or more processors and a memory storing computer program instructions that,