New energy battery diaphragm enhancement method based on degradable polymer

Abstract

The invention discloses a new energy battery diaphragm enhancement method based on a degradable polymer, and relates to the technical field of battery diaphragm materials, and the method comprises the following steps: constructing a panoramic light stripe record of synchronous observation of temperature and an electric field, and uniformly aligning a time axis and a space axis to form a continuous heating point track; and generating a temperature electric field coupling image band according to the continuous heating point track. By synchronously sensing and cooperatively regulating and controlling the temperature field, the electric field and the structure evolution process in the diaphragm, the original sudden and discrete degradation behavior is converted into an evolution path capable of being continuously guided, and local instability expansion is inhibited. Meanwhile, through micropore trend rearrangement and geometric traction structure and periodic form adjustment, energy and stress are guided to be dispersed in order, ion transmission balance is maintained, and the safety, reliability and service life stability of the diaphragm in long-term circulation are improved.

Description

Technical Field

[0001] This invention relates to the field of battery separator material technology, and more specifically to a method for enhancing new energy battery separators based on biodegradable polymers. Background Technology

[0002] Enhancement of new energy battery separators based on biodegradable polymers refers to a technical approach that involves introducing biodegradable polymers into the preparation or modification of new energy battery separators. This is achieved through methods such as film formation, composite formation, coating, or structural modulation to enhance the function and optimize the performance of traditional battery separators. This technology leverages the tunable properties of biodegradable polymers in molecular structure design, mechanical toughness, pore size control, and interfacial compatibility. This allows the separator to maintain the stability of ion transport channels while improving its mechanical strength, thermal stability, and electrolyte wetting properties, thereby improving the safety and operational stability of the battery during charging and discharging. Simultaneously, the introduction of biodegradable polymers helps reduce the environmental burden of battery materials after disposal, enabling the separator to meet electrochemical performance requirements while also considering green manufacturing and sustainable development needs. This concept embodies the technological direction of synergistic development of performance improvement and environmental protection attributes in new energy battery materials.

[0003] Existing technologies have the following shortcomings: Under current conditions, when biodegradable polymers are introduced into the separator reinforcement system during long-term charge-discharge cycles of new energy batteries, the degradation behavior of the polymers is usually influenced by the temperature field, electric field distribution, and local stress state, making it difficult to maintain spatial consistency in the degradation process. Especially in the later stages of cycling, local temperature rise regions inevitably occur inside the battery, accompanied by uneven electric field distribution. When the local temperature rise and electric field effect are superimposed, it can easily trigger abrupt changes in the degradation rate of the biodegradable polymer in a local area, causing the material structure in that area to enter a rapid degradation stage prematurely. Affected by this, the separator experiences a thickness gradient change that expands from the local area to the periphery in a short period of time, and the original continuous and stable pore structure collapses and rearranges, resulting in an imbalance in the spatial distribution of ion transport channels. The above structural instability further causes abnormal concentration of local current density, significantly weakening the separator's isolation function, and in extreme cases, inducing unexpected contact between the positive and negative electrodes, causing a short circuit risk inside the battery, and potentially triggering subsequent heat accumulation and thermal runaway problems.

[0004] The information disclosed in the background section is only intended to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide a method for enhancing the separator of new energy batteries based on biodegradable polymers, so as to solve the problems in the background art mentioned above.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a method for enhancing the separator of new energy batteries based on biodegradable polymers, comprising the following steps: A panoramic light ripple record for simultaneous observation of temperature and electric field is constructed. A continuous trajectory of heating points is formed by aligning the time axis and the spatial axis. A temperature-electric field coupled image band is generated based on the continuous trajectory of heating points. By continuously tracking the trajectory of hot spots based on temperature-electric field coupled image bands, the starting position and expansion boundary of the degradation rate surge are determined, and a degradation front fingerprint that can be continuously tracked is generated. Based on the degradation front fingerprint, time-resolved unfolding analysis of the new energy battery separator structure was performed to reconstruct the structural profile of the separator thickness as a function of time and spatial location, and obtain the thickness gradient evolution map. Based on the thickness gradient evolution map, the orientation of the micropores inside the diaphragm is rearranged directionally, and avoidance zones are introduced in the regions of abrupt changes in thickness gradient to generate a pore stability list to define the stable and controllable regions of the structure. Based on the duct stability list, a continuous geometric traction ridge network is constructed in the unstable area. The deformation direction of each structural layer of the diaphragm is uniformly guided by the traction ridge network, so that different levels of structure form a cooperative displacement relationship under thermal, electrical and stress disturbances, and the risk traction cable is woven in the diaphragm plane by the traction ridge network. Using the risk traction cable as the overall support framework, a breathing phase traction dome is constructed, which periodically expands and contracts according to the rhythm of thermal pulse changes, thereby regulating the synchronous reconstruction of the internal temperature field and electric field of the new energy battery separator and dynamically adjusting the advancement pace of the degradation front.

[0007] Preferably, the steps for generating temperature-electric field coupled image bands are as follows: During the charge and discharge cycle of new energy batteries, continuous imaging is performed on the area containing the effective working area of ​​the separator to form a panoramic light pattern record covering the separator area, and the temperature distribution and electric field distribution at the corresponding time are collected simultaneously. Based on panoramic light pattern recording, temperature distribution, and electric field distribution, the data at each acquisition time are time-stamped and bound, and a unified spatial coordinate is established using the diaphragm plane to achieve alignment between the time axis and the spatial axis. After aligning the time axis with the spatial axis, the continuous heating point trajectory in the membrane plane is extracted by combining the local temperature rise region in the temperature distribution, the local concentrated region in the electric field distribution, and the changes in the light pattern. Based on the trajectory of continuous heating points, a local field of view including the area surrounding the heating point is cropped at the corresponding time. The light pattern, temperature distribution and electric field distribution are superimposed and stitched together in time sequence to generate a temperature-electric field coupled image band.

[0008] Preferably, the degradation front fingerprint generation steps are as follows: Based on the temperature-electric field coupled image strip, the image strip is unfolded time-by-time according to the acquisition time sequence. Under the unified spatial coordinates, the temperature rise area and the electric field intensity concentration area are extracted to form the initial recording unit of the hot point and construct the initial trajectory skeleton of the hot point. Based on the initial trajectory skeleton of the hot spot, a corresponding relationship is established between the hot spot regions at adjacent time points, and short-term gaps in the trajectory are interpolated to form a continuous trajectory link of hot spots with temporal and spatial continuity. The temperature change amplitude and electric field intensity change amplitude are extracted time by time along the continuous trajectory link of the heating point to determine the earliest time when the temperature change and electric field change are synchronously enhanced, and the corresponding center coordinates of the heating point are determined as the starting position of the sudden increase in degradation rate. Centered on the starting position of the sudden increase in degradation rate, the outer edge advancement coordinates of the hot spot region contour at each subsequent time point are recorded to form an extended boundary sequence arranged in chronological order, generating a continuously traceable degradation front fingerprint.

[0009] Preferably, after forming a continuous trajectory link of the hot spot, the spatial expansion direction of the hot spot region contour is used as the boundary advancement direction constraint, and the temperature change amplitude marker and electric field intensity change amplitude marker corresponding to each moment are simultaneously retained in the expansion boundary sequence, so that the degradation front fingerprint has both spatial boundary continuity and field intensity evolution correlation, which is used to characterize the rhythmic features of the degradation front advancement process.

[0010] Preferably, the steps for generating the thickness gradient evolution map are as follows: Based on the coordinates of the reference point for reading the degradation front fingerprint and the front boundary sequence, the forward and lateral directions are established on the diaphragm plane, and the main unfolding path and parallel unfolding path are arranged along the forward direction. The diaphragm thickness was collected point by point along the main deployment path and the parallel deployment path according to time nodes, forming a raw thickness record sequence bound to time nodes, deployment paths and spatial locations; The thickness distribution surface at each time node is generated based on the original thickness record sequence, and the structural profile is reconstructed along the unfolding path, and the structural profile is synchronously aligned with the leading edge boundary. Thickness gradient concentration zones and gradient abrupt change regions are extracted from structural profiles and compiled in chronological order to form a thickness gradient evolution map.

[0011] Preferably, the steps for generating the pore stability list are as follows: Based on the thickness gradient evolution map, determine the coordinates of the reference point, the outline of the thickness gradient concentration zone, and the outline of the thickness gradient abrupt change region, and establish the main direction and lateral direction on the diaphragm plane; Based on the contour of the thickness gradient abrupt region, a surrounding strip boundary is constructed, forming the body region of the thickness gradient abrupt region, the adjacent region of the thickness gradient abrupt region, and the distant region of the thickness gradient abrupt region. Based on the regional division, the direction of the micropore connection is rearranged in a directional manner, so that the distant region forms a main direction through-path, the adjacent region forms a through-path along the contour tangentially, and the body region maintains a low through-path. In the region of abrupt change in thickness gradient, an avoidance zone that follows the contour is constructed, and a low-connectivity hole structure is formed within the avoidance zone, while a bypass connection path is retained at the outer edge of the avoidance zone. A pore stability list is generated based on the micropore connectivity characteristics and the avoidance zone boundary, and the structural stability zone and controllable zone are defined based on the pore stability list.

[0012] Preferably, the risk traction cable formation process is as follows: Based on the duct stability list, read the boundary coordinates of the unstable area, the main connection direction of the duct, and the lateral connection direction of the duct. Determine the direction of the traction main shaft within the unstable area and plan the center trajectory of multiple ridge lines. The diaphragm is oriented and imprinted along the center trajectory of the ridge line, so that the center trajectory of the ridge line is transformed into a continuous ridge-like undulation that runs through each structural layer, thereby unifying the deformation guidance direction of each structural layer of the diaphragm. Based on continuous ridge-like undulations, in-plane weaving connections are made at preset bridging positions, so that multiple ridge-like undulations form a continuous geometric traction ridge network, and form a risk traction cable in the diaphragm plane.

[0013] Preferably, the ridge center trajectory extends continuously along the traction main axis in the unstable region, and the ridge-like undulations are provided with a gradual anchoring zone at the end and a height transition zone near the avoidance zone, so that the geometric traction ridge network forms a continuous guide in the traction main axis direction, and forms a diversion channel in the transverse direction through weaving connection, so that the displacement of the diaphragm under the action of temperature disturbance, electric field disturbance and stress disturbance is controlled and distributed along the risk traction cable and kept in coordination.

[0014] Preferably, a breathing phase traction dome is constructed using a risk traction cable as the supporting framework, and the dome is periodically expanded and contracted according to the rhythm of thermal pulse changes to guide the synchronous reconstruction of the internal temperature field and electric field of the new energy battery separator, and the following steps are taken to regulate the advancement process of the degradation front: Using the risk traction cable as the supporting framework, multiple adjacent arch segments are divided along the direction of the risk traction cable within the controllable area to determine the reference plane, coverage area, arch segment orientation and boundary setback parameters of the dome. Based on the rhythm of thermal pulse changes inside the diaphragm, each arch segment is driven to periodically expand and contract between the initial arch height and the working arch height, so that the dome can be expanded and contracted segment by segment along the direction of the risk traction cable. During the periodic opening and closing of the dome, the temperature and electric field distribution inside the membrane are reconstructed synchronously along the risk traction cable, so that the degradation front advances rhythmically along the traction path.

[0015] The technical effects and advantages provided by the present invention in the above technical solution are as follows: This invention transforms the originally discrete and abrupt degradation behavior within the membrane into a continuously guided evolutionary process by simultaneously sensing and coordinating the temperature field, electric field, and structural evolution process. Utilizing the step-by-step traction of degradation front fingerprints, thickness gradient evolution maps, and risk traction mechanisms, the temperature and electric fields maintain coordinated changes in space and time, avoiding degradation rate jumps caused by the superposition of local conditions. This effectively suppresses the tendency of the membrane structure to expand from local instability to the periphery, improving the overall stability and safety margin of the membrane during long-term charge-discharge cycles.

[0016] This invention, through the synergistic design of micropore connectivity, geometric traction ridges, and a breathing-type phase traction dome, enables the diaphragm to actively regulate and slowly release energy under thermal, electrical, and stress disturbances. During operation, the diaphragm structure can periodically adjust its shape in accordance with the thermal pulse rhythm, guiding the internal energy and stress to disperse and release along a preset path. This maintains a balanced distribution of ion transport channels, reduces the risk of abnormal current density concentration, and allows the diaphragm to achieve higher operational reliability and lifespan stability while meeting electrochemical performance requirements. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0018] Figure 1 This is a flowchart of the new energy battery separator enhancement method based on biodegradable polymers according to the present invention. Detailed Implementation

[0019] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, they are provided so that the description of this disclosure will be more complete and fully convey the concept of the exemplary embodiments to those skilled in the art.

[0020] This invention provides, for example Figure 1 The illustrated method for enhancing the separator of new energy batteries based on biodegradable polymers includes the following steps: A panoramic light ripple record for simultaneous observation of temperature and electric field is constructed. A continuous trajectory of heating points is formed by aligning the time axis and the spatial axis. A temperature-electric field coupled image band is generated based on the continuous trajectory of heating points. This step is used to complete the panoramic light ripple recording of simultaneous temperature and electric field observations, and to form a continuous trajectory of hot spots by aligning the time axis and spatial axis. Then, a temperature-electric field coupled image band is generated based on this continuous hot spot trajectory, thus providing continuous and traceable spatiotemporal foundational information for subsequent degradation front identification. The specific implementation steps are as follows: When a new energy battery is in a predetermined charge-discharge cycle, an observation range including the effective working area of ​​the separator is selected, and panoramic light ripple recording imaging conditions are established. Specifically, an observation channel that allows both incident and outgoing light to pass through is set up on the battery casing corresponding to the separator area. This ensures that the separator area can be continuously imaged without altering the battery assembly relationship. Simultaneously, a striped incident light forming component is arranged on one side of the observation channel, causing the incident light to form a light ripple projection with a fixed spatial period on the separator area. The light ripple projection covers the central area, edge area, and area near the tabs of the effective working area of ​​the separator. A light ripple acquisition imaging device is arranged on the other side to continuously acquire the spatial morphology of the light ripple projection at various times. This is to achieve simultaneous observation of temperature and electric field. Temperature and electric field distributions are simultaneously acquired within the same observation range. Temperature distribution is recorded using a temperature acquisition imaging device with the same field of view as the light ripple acquisition imaging device, ensuring that each light ripple image corresponds to a temperature distribution image at the same time. Electric field distribution is recorded using a potential acquisition method that corresponds one-to-one with the diaphragm plane coordinates. Potential acquisition points are arranged in rows and columns along the diaphragm plane and established with the light ripple projection coordinates, so that the potential distribution at each moment can be converted into the electric field intensity distribution on the diaphragm plane. The above continuous acquisition process is executed with a fixed acquisition cycle, which covers the current rise phase, constant current phase, constant voltage phase, and static phase during the charging and discharging process, so that the panoramic light ripple recording includes the complete changes in the diaphragm state under different working stages.

[0021] After obtaining continuous sequences of light ripple images, temperature distribution images, and electric field distribution records, a unified alignment of the time axis and spatial axis is performed to form an overlayable spatiotemporal data base map. Specifically, the same time stamp is written at each acquisition moment, and the light ripple images, temperature distribution images, and electric field distribution records are bound to the same time data unit with this time stamp, and arranged from early to late according to the time stamp to form a time axis. Subsequently, a spatial axis is established, with a two-dimensional coordinate system established with the diaphragm plane as a reference, using the geometric boundaries of the effective working area of ​​the diaphragm, the electrode coverage boundaries, and the diaphragm edge boundaries as coordinates. The limiting line is established by introducing position markers in the light pattern projection and simultaneously identifying the same position markers in the temperature distribution image, so that the light pattern image and the temperature distribution image are aligned in the same two-dimensional coordinate system. Then, the physical position of the potential acquisition point is represented by the same two-dimensional coordinate system, so that the electric field distribution record is spread out in the two-dimensional coordinate system in a grid manner. After the spatial axis is established, the same coordinate mapping is performed on all time data units, so that the same coordinate position at any time can simultaneously correspond to the light pattern shape, temperature value and electric field intensity value, so that the continuous evolution on the time axis and the position correspondence on the spatial axis are consistent.

[0022] Based on the unified alignment of the time and space axes, continuous heating point trajectories are extracted from the panoramic light ripple recording. Specifically, localized temperature rise areas in the temperature distribution image are used as initial locations for candidate heating point regions. At each moment, the boundaries of regions in the temperature distribution image where the temperature continuously rises relative to the surrounding background are determined as candidate boundaries. Simultaneously, the electric field intensity distribution corresponding to these candidate boundaries is read under the same coordinate system. Regions where the electric field intensity is locally concentrated and coincides with the candidate boundaries are selected as confirmed heating point regions. Subsequently, the morphological changes of the light ripples in the confirmed heating point regions are read from the light ripple image, specifically including the bending direction, bending amplitude, strip spacing, and strip clarity changes of the light ripple strips within the region. These morphological changes, along with the temperature rise and electric field concentration, are jointly annotated under the same coordinate system, so that the confirmed heating point region at each moment has center coordinates, boundary coordinates, temperature intensity markers, and electric field intensity markers. The process involves marking the location of the hot spot. Next, a continuous relationship is established between adjacent time points. The center coordinates of the confirmed hot spot region at the previous time point are associated with the center coordinates of the confirmed hot spot region at the next time point based on their nearest neighbor positions. The continuity of the same hot spot on the time axis is determined by the overlap of the boundary coordinates, allowing the process of the hot spot from its appearance to its movement and expansion to form a continuous path on the spatial axis. When a hot spot splits into multiple regions during time progression, the region with the smallest distance from the center coordinates of the previous time point and the strongest continuity of electric field intensity change is taken as the main hot spot branch, and the other branches are recorded as accompanying hot spot branches. This ensures that the continuous hot spot trajectory can simultaneously express the main path and the accompanying path, preventing the hot spot migration process from being truncated. The resulting continuous hot spot trajectory includes a sequence of center coordinates and a sequence of boundary coordinates arranged in chronological order, and each node carries a temperature intensity marker and an electric field intensity marker for the corresponding time point.

[0023] A temperature-electric field coupled image band is generated based on the continuous trajectory of hot spots. Specifically, the center coordinate sequence of the continuous hot spot trajectory is used as the main axis of the image band. At each moment, a local field of view, including a predetermined width around the hot spot, is cropped with the boundary of the confirmed hot spot area as the core. The light ripple image within this local field of view is used as a morphological base map. The temperature distribution within the same local field of view is superimposed onto the morphological base map as a continuous grayscale layer. Then, the electric field intensity distribution within the same local field of view is superimposed onto the temperature layer using boundary lines of equal intensity partitions. This allows the same local field of view to simultaneously present three types of information: light ripple morphology, temperature distribution, and electric field distribution. Subsequently, the local fields of view at each moment are sequentially stitched together along the time direction of the image band according to the time axis. The stitching process... The spatial axis coordinates are kept constant, and the center coordinates of the heat point are kept near the main axis of the image band, so that the image band visually forms a continuous strip structure that progresses along time. In order to enhance the consistency of the coupled expression, the center coordinates and boundary positions of the heat point at each moment are marked in the image band, so that the image band can directly show the displacement and expansion of the heat point trajectory over time, and at the same position, show the synchronous changes of temperature rise and electric field concentration over time. The resulting temperature and electric field coupled image band is continuous along the time axis, can be located along the spatial axis, and can be traced along the heat point trajectory. It can serve as the basic input for subsequent steps to continuously track the heat point trajectory and determine the starting position and expansion boundary of the degradation rate surge.

[0024] By continuously tracking the trajectory of hot spots based on temperature-electric field coupled image bands, the starting position and expansion boundary of the degradation rate surge are determined, and a degradation front fingerprint that can be continuously tracked is generated. This step uses temperature-electric field coupled imagery as a continuous observation carrier to continuously track the trajectory of heating points inside the new energy battery separator. This is used to determine the starting position and expansion boundary of the sudden increase in the degradation rate of the degradable polymer, and based on this, a continuously traceable degradation front fingerprint is generated, thus providing a directly applicable spatiotemporal identifier for subsequent time-by-time analysis of the separator structure. The specific implementation process is as follows: A continuously readable spatiotemporal unfolding sequence is established based on the temperature-electric field coupled image band, and the initial trajectory skeleton of the hot spot is extracted from this spatiotemporal unfolding sequence. In specific implementation, the temperature-electric field coupled image band is unfolded time-by-time according to the acquisition time sequence. After unfolding, each time moment corresponds to an overlay image containing temperature distribution information and electric field distribution information, and the overlay image maintains the same position under the same spatial coordinates. Subsequently, in the overlay image at each time moment, the temperature rise abnormality area and the electric field intensity concentration abnormality area are located. The location method adopts the spatial coordinate labeling method, and the center position, edge contour position of the temperature rise abnormality area, and the center position, edge contour position of the electric field intensity concentration area are recorded as coordinate sets respectively. Next, the temperature rise abnormality area and the electric field intensity concentration area are spatially overlapped within the same time moment. The determination is based on the overlap range of their contours and the distance relationship between their center positions. The area where the overlap range meets the continuous coverage relationship is defined as the hot spot area. The center coordinates, contour coordinates, and corresponding time mark of the hot spot area form the initial recording unit of the hot spot. Arranging the initial recording units of the heat points at each moment in chronological order yields the initial trajectory skeleton of the heat points in the temperature-electric field coupled image band, allowing the process of the heat points from appearance to movement to be presented continuously in the same spatial coordinate system.

[0025] Continuous tracking is performed based on the initial trajectory skeleton of the hot spot, constructing a continuous link of the hot spot trajectory and completing the temporal and spatial continuity of the trajectory. Specifically, overlaid images of two adjacent time points are used as a tracking unit. A representative set of contour points is selected within the hot spot region contour of the previous time point, and the corresponding region with the closest spatial location and continuous contour shape is found in the overlaid image of the next time point. This corresponding region is determined as the continuation region of the same hot spot in the next time point. This correspondence establishment process is repeated for each tracking unit, thereby connecting the continuation regions of the hot spot at multiple time points into a continuous link. To ensure the continuity of the link, short-term gaps in the link are filled using trajectory interpolation: when a hot spot region that meets the overlap criteria does not appear at a certain time point, the center coordinates of the hot spot region at the previous time point and the center coordinates of the hot spot region at the next time point are used as the insertion position of the missing hot spot center coordinates in the direction of the line connecting the center coordinates of the hot spot region at the previous time point and the hot spot contour coordinates at the missing time point are extrapolated according to the outward variation trend of the contour shape between the previous and next time points, so that the missing time point is continuously expressed on the trajectory. Through this continuous tracking process, the trajectory of the heat source in the temperature-electric field coupled image band is no longer a discrete set of points, but forms a continuous trajectory link containing center coordinates, contour coordinates, time markers, temperature intensity information, and electric field intensity information, providing a trajectory basis that can be called on a time-by-time basis for the subsequent definition of the degradation surge location and expansion boundary.

[0026] The starting position of the degradation rate surge is determined based on the continuous trajectory link, and the boundary range extending outward from this starting position is further determined, forming a degradation expansion boundary sequence that can be extended moment by moment. In specific implementation, a moment-by-moment scan is performed along the continuous trajectory link from the early to the late time period. The temperature change amplitude and electric field intensity change amplitude of the hot spot region at each moment are extracted and compared with the corresponding amplitudes at the previous moment. When a situation occurs near the same spatial location where the temperature change amplitude increases rapidly within a continuous time period and the electric field intensity change amplitude increases synchronously within the same time period, the earliest moment corresponding to this situation is taken as the trigger moment of the degradation rate surge, and the center coordinates of the hot spot region corresponding to this trigger moment are determined as the starting position of the degradation rate surge. Subsequently, using the starting position of the degradation rate surge as the boundary starting point, the defined range is expanded outward based on the outline of the hot spot region at the trigger moment. The definition method uses the outer edge advancement description: in the superimposed image at each subsequent moment, the direction of movement and the distance of advancement of the outer edge of the hot spot region outline are observed with the starting position as the center, and the coordinates of the endpoint of advancement in each direction are recorded, forming the set of expansion boundary coordinates for that moment. Arrange the set of extended boundary coordinates at each time point in chronological order to obtain the extended boundary sequence driven by the starting position. This clearly depicts the process of spatial boundary change from local triggering to peripheral expansion of degradation, so that degradation expansion is no longer an abstract description, but is transformed into a boundary coordinate expression that can be called on a time-by-time basis.

[0027] Based on the degradation front fingerprint, time-resolved unfolding analysis of the new energy battery separator structure was performed to reconstruct the structural profile of the separator thickness as a function of time and spatial location, and obtain the thickness gradient evolution map. This step is carried out under the premise that the degradation front fingerprint has been generated and can be continuously tracked. Using the benchmark points, front boundary sequence, propagation direction information, and propagation rhythm information provided by the degradation front fingerprint, the new energy battery separator structure is synchronously unfolded in time and space. A continuous thickness acquisition and profile reconstruction process is established around the front propagation path, ultimately obtaining a thickness gradient evolution map that reflects the evolution of the separator thickness gradient over time and spatial expansion. The specific implementation process is as follows: A unified reference and acquisition path for time-resolved unfolding is established based on the degradation front fingerprint. In practice, the coordinates of the reference point used for positioning in the degradation front fingerprint are read and projected onto the diaphragm's planar coordinate frame, serving as the starting origin for thickness unfolding analysis. Simultaneously, the set of front boundary coordinates corresponding to each moment in the degradation front fingerprint is read and arranged chronologically to form a front boundary sequence, ensuring that the time nodes of the diaphragm structure analysis are consistent with the front advancement process. Subsequently, the front advancement direction is determined based on the morphological differences of the front boundary sequence. This forward direction is defined on the diaphragm plane, and the direction perpendicular to the forward direction is defined as the lateral direction, thus forming a reusable directional reference within the diaphragm plane. Next, the main unfolding path is arranged along the forward direction, centered on the reference point. The main unfolding path extends from the reference point through the area covered by the front boundary sequence. Several parallel unfolding paths are arranged laterally on both sides of the main unfolding path, maintaining a fixed spacing between the parallel unfolding paths and the main unfolding path. This spacing is determined by the diaphragm size and the target spatial resolution requirements, ensuring that any position within the coverage area of ​​the front boundary sequence falls within the coverage zone of a particular unfolding path. Finally, each unfolding path is bound to the time node of the front boundary sequence to form a three-element correspondence between time node, unfolding path and spatial location. This ensures that thickness acquisition at any subsequent time can be repeated along the same unfolding path, thereby ensuring that the thickness changes between different time nodes have a directly comparable spatial consistency.

[0028] Based on a unified reference and acquisition path, the membrane thickness is acquired at each time node and each spatial location to form a raw thickness record sequence. In specific implementation, with the battery in operation at the corresponding time node, the membrane is placed in controlled observation conditions where thickness detection is possible. Thickness acquisition is completed using a detection method that can obtain thickness information without disrupting the continuity of the membrane. The thickness detection method can be a tomographic scanning method based on near-infrared reflection, which scans along the unfolding path to obtain the depth difference between the reflection interfaces of the upper and lower surfaces of the membrane and converts the depth difference into the thickness value at that spatial location. Alternatively, a tomographic scanning method based on micro-beam penetration can be used, which obtains the upper and lower boundary positions by continuously imaging the density distribution of the membrane cross-section, and then obtains the thickness value from the difference between the upper and lower boundary positions. Regardless of the thickness detection method used, thickness data is collected point-by-point along the main unfolding path, starting from a position close to the reference point, with a fixed step distance. The step distance is determined by the smallest spatial scale at which thickness gradients may occur, ensuring continuous coverage of areas with abrupt thickness changes. After completing the main unfolding path data collection, each parallel unfolding path is sequentially collected point-by-point using the same step distance, resulting in a two-dimensional thickness lattice covering the front boundary sequence. Each thickness value in each thickness lattice is bound and recorded with its corresponding time node marker, unfolding path marker, and spatial coordinates, forming the original thickness record unit for that time node. The process is then repeated at the next time node, following the exact same set of unfolding paths, using the same step distance, and within the same spatial coordinate frame, ensuring a one-to-one correspondence between the original thickness record units at different time nodes and the same coordinate positions. By repeating this data collection process for all time nodes covered by the front boundary sequence, a chronologically arranged original thickness record sequence is formed, preserving both the continuity of membrane thickness over time and its continuity with spatial expansion, providing a sufficient data foundation for subsequent profile reconstruction.

[0029] Based on the original thickness record sequence, a structural profile of the diaphragm thickness variation over time and space is reconstructed, and the structural profile is synchronously aligned with the degradation front fingerprint. Specifically, firstly, using the two-dimensional thickness lattice at each time node as a basis, a thickness distribution surface is generated within the diaphragm plane coordinates for that time node. The thickness distribution surface exhibits longitudinal thickness variation along the main unfolding path and lateral thickness variation along the parallel unfolding path. Then, the thickness distribution surface is truncated along the forward direction to form several longitudinal structural profiles. Each longitudinal structural profile corresponds to an unfolding path, and the longitudinal structural profile continuously describes the thickness variation from the reference point to the end of the front boundary sequence coverage at that time node. Next, the longitudinal structural profiles of adjacent time nodes are superimposed according to the same unfolding path markings, so that the thickness variation of the same unfolding path at multiple time nodes forms a thickness-time continuous trajectory. The set of front boundary coordinates corresponding to that time node in the degradation front fingerprint is projected onto the longitudinal structural profile, and the intersection position of the front boundary on the unfolding path is marked on the longitudinal structural profile, thereby unifying the front advancement arrival position and the thickness change occurrence position into the same profile coordinate system. Furthermore, the advancement rhythm information from the degradation front fingerprint is incorporated into the profile arrangement process. A time scale consistent with the advancement rhythm is adopted for the spacing between time nodes, resulting in a denser distribution of time nodes for faster-advancing phases and a sparser distribution for slower-advancing phases. This ensures that the structural profile sequence consistently expresses the degradation evolution rhythm. Through the above reconstruction and alignment, a family of structural profiles is obtained that can simultaneously express spatial location, thickness variation, temporal advancement, and front arrival. Thickness variation is no longer a stack of discrete points but a continuous profile evolution description closely bound to the front advancement process.

[0030] Thickness gradients are extracted from structural profile groups to form a thickness gradient evolution map, which continuously represents the temporal series, spatial distribution, and abrupt change zone locations. Specifically, at each time point, the thickness difference trend between adjacent spatial locations is calculated along the forward direction on the thickness distribution surface, and the thickness difference trend between adjacent unfolding paths is calculated along the lateral direction. The transition regions where thickness changes from gradual to rapid are determined by these two trends, and thickness gradient concentration zones are then marked on the diaphragm plane. The location of these concentration zones is described using planar coordinates, and their morphology is described using boundary contours within the same coordinate framework as the leading edge boundary sequence, allowing direct comparison between the concentration zones and the leading edge boundary of the degradation leading edge fingerprint. Subsequently, the concentration zones of thickness gradients at all time points are superimposed in chronological order, maintaining the reference point position, unfolding path direction, and spatial coordinates. This ensures that the thickness gradient concentration zones continuously represent the migration, expansion, and contraction over time within the same spatial framework. Furthermore, the leading edge boundary contours corresponding to each time point are superimposed in the same representation, providing a visual representation of the relative positional relationship between the thickness gradient concentration zones and the leading edge boundary during the temporal progression. Next, a boundary description of the gradient abrupt change region is established around the thickness gradient concentration zone: when a region where the thickness change amplitude rapidly accumulates over a short distance appears at a certain time node, the inner and outer boundaries of this region are recorded as two closed or semi-closed contours, and the area between the two contours is defined as the gradient abrupt change region; the gradient abrupt change region is continuously recorded in the same contour manner at subsequent time nodes, thus forming a time series contour set of the gradient abrupt change region. Finally, the thickness distribution surface, thickness gradient concentration zone contour, gradient abrupt change region contour, leading edge boundary contour, and reference point position at each time node are compiled into a thickness gradient evolution map, so that the thickness gradient evolution map can provide the spatial profile of the diaphragm thickness at any time node, provide the thickness evolution trajectory over time at any spatial location, and clearly identify the location and expansion trend of the thickness gradient concentration zone and the gradient abrupt change region.

[0031] Based on the thickness gradient evolution map, the orientation of the micropores inside the diaphragm is rearranged directionally, and avoidance zones are introduced in the regions of abrupt changes in thickness gradient to generate a pore stability list to define the stable and controllable regions of the structure. This step is carried out based on the existing thickness gradient evolution map, which clearly defines the contours of concentrated thickness gradient zones, abrupt thickness gradient regions, and the consistency of spatial coordinates at each time point. Using the thickness gradient evolution map as a spatial constraint and directional reference for the internal structural control of the diaphragm, the directional orientation of the micropores within the diaphragm is rearranged, and avoidance zones are introduced in the abrupt thickness gradient regions. This generates a list of stable pores to define the stable and controllable areas of the structure, providing directly referable boundaries and list-based constraints for subsequent structural reinforcement. The specific implementation process is as follows: Based on the thickness gradient evolution map, directional benchmarks and partition boundaries are established to ensure that the rearrangement of micropore connectivity has a unified spatial coordinate and directional description. Specifically, the benchmark point coordinates in the thickness gradient evolution map are fixed as the origin of the diaphragm plane coordinate system. The contour of the concentrated thickness gradient zone is unfolded in the diaphragm plane coordinate system, and the main extension direction of the concentrated thickness gradient zone contour is defined as the main direction, while the direction perpendicular to the main direction is defined as the lateral direction, thus forming a consistent directional benchmark for subsequent micropore connectivity descriptions. Subsequently, the contour of the abrupt thickness gradient region is used as the core boundary line. A continuous surrounding strip boundary is constructed outside the core boundary line. The surrounding strip boundary maintains a shape-following relationship with the contour of the abrupt thickness gradient region. The distance between the surrounding strip boundary and the contour of the abrupt thickness gradient region is taken as the minimum coverage width for the transition from abrupt to gradual thickness gradient within the diaphragm plane, ensuring that this strip boundary can completely cover the transition zone surrounding the abrupt thickness gradient region. This divides the diaphragm into three regions: the thickness gradient abrupt change region itself, the thickness gradient abrupt change region adjacent to it, and the thickness gradient abrupt change region far from it. The thickness gradient abrupt change region itself is bounded by the outline of the thickness gradient abrupt change region; the thickness gradient abrupt change region adjacent to it is bounded by the outline of the thickness gradient abrupt change region and the surrounding strip boundary; and the thickness gradient abrupt change region far from it is the remaining region excluding the first two. After partitioning, each type of region is recorded point-by-point on the diaphragm plane using boundary coordinates, forming a list of region boundaries that can be used for subsequent processing and positioning. This ensures that each adjustment of the micropore connectivity direction can be repeatedly applied within the same boundary range.

[0032] Based on the partition boundaries, specific rearrangement targets and path constraints for the micropore connectivity orientation are determined, ensuring that the micropore connectivity orientation in different regions has operable morphological requirements and is consistent with the thickness gradient evolution pattern. In specific implementation, for regions far from the thickness gradient abrupt change region, the micropore connectivity orientation is set to maintain a continuous, through-flow layout along the main direction. This requires the formation of a main directional connectivity pathway extending to the membrane boundary within the far region, while maintaining uniformly dispersed auxiliary connectivity pathways in the lateral direction to prevent localized congestion of ion channels within the far region. For regions adjacent to the thickness gradient abrupt change region, the micropore connectivity orientation is set to change from a through-flow tendency directly traversing the body of the thickness gradient abrupt change region to a through-flow tendency circling around the contour of the thickness gradient abrupt change region. This requires the micropore connectivity orientation in the adjacent region to deflect upon approaching the contour of the thickness gradient abrupt change region, with the deflection direction consistent with the tangential direction of the contour, allowing the connectivity pathway to slide along the outer side of the contour and form a continuous bypass band on the outer side of the contour. To avoid excessively abrupt deflection that could weaken the pore walls, the deflection process is specified to employ a continuous bending pattern. This continuous bending pattern transitions smoothly within the diaphragm plane, without any sharp angles. To prevent excessively high pore density within the bypass zone that could lead to overly concentrated local connectivity, the minimum spacing between any two adjacent through-paths within the bypass zone is specified to be consistent. This minimum spacing is jointly limited by the target values ​​of diaphragm porosity and pore diameter. For the body region, which experiences abrupt changes in thickness gradient, the micropore connectivity is designed not to form through-paths. This requires the body region to form a low-connectivity, low-through-path pore structure, making it the core load-bearing area for the subsequent avoidance zone. Through these objectives and constraints, the rearrangement of micropore connectivity can clearly define the direction, spacing, bending pattern, and connectivity requirements at the textual level, and each requirement can be implemented within the partition boundaries.

[0033] Based on the rearrangement target, the directional rearrangement of the micropore connectivity is achieved during the membrane preparation and modification process, ensuring that the rearranged positions are aligned point-by-point with the partition boundaries of the thickness gradient evolution map. Specifically, a polyolefin porous membrane is selected as the membrane substrate as the skeleton layer, and a biodegradable polymer reinforcement layer is introduced on the surface of the skeleton layer. The biodegradable polymer reinforcement layer is formed into a continuous covering membrane using a wet film deposition method. Subsequently, directional stretching is performed to create pores and connectivity: In the first stage, a main stretch is applied along the main direction on the entire membrane, elongating the micropores of the skeleton layer and generating a main directional orientation, while simultaneously forming a continuous fine stretching texture in the biodegradable polymer reinforcement layer along the main direction; in the second stage, lateral stretching is applied only in the vicinity of the thickness gradient abrupt change region along the lateral direction. The application range of the lateral stretching is located by the boundary coordinates of the vicinity region, and the application method uses local clamping positioning and local loading displacement, ensuring that the lateral stretching only acts on the vicinity region and not on the distant region. Through the combination of main stretching and lateral stretching, the distant region retains the main directional through-flow micropore connectivity, while the vicinity region forms a micropore connectivity orientation deflected tangentially along the contour. To further enhance the bypassing trend, directional swelling induction is applied to the side of the adjacent region boundary near the thickness gradient abrupt change region contour: the biodegradable polymer reinforcement layer is briefly contacted with the swelling medium in the adjacent region, and the swelling medium is spread tangentially on the outer side of the contour, so that the relaxation direction of the pore walls generated by swelling is consistent with the bypassing direction. Subsequently, the pore wall morphology is fixed by controlled drying, thereby forming a continuous bypassing path for the micropore connectivity in the adjacent region on the outer side of the contour. Throughout the directional rearrangement process, all areas of action are located using the boundary coordinates of the thickness gradient evolution map, ensuring that the application positions of the main stretching, lateral stretching, and directional swelling induction are consistent with the body region of the thickness gradient abrupt change region, the adjacent region of the thickness gradient abrupt change region, and the region far from the thickness gradient abrupt change region, avoiding cross-regional diffusion of the rearrangement effect that could lead to uncontrolled pore layout.

[0034] A clearance zone is introduced in the thickness gradient abrupt change region to form a continuous low-connectivity zone, and the clearance zone is continuously connected to the bypass path of the adjacent region. Specifically, using the outline of the thickness gradient abrupt change region as the center line, clearance zone boundaries are constructed on both sides of the center line. The clearance zone boundaries maintain a constant fit with the outline of the thickness gradient abrupt change region. The width of the clearance zone is taken as the coverage value of the outward expansion radius of the thickness gradient abrupt change region when it reaches its maximum outward expansion in the thickness gradient evolution time series, ensuring that the clearance zone can cover the spatial range that the thickness gradient abrupt change region may expand to. Subsequently, a densification treatment is applied to the strip-shaped region enclosed by the clearance zone boundaries, resulting in a pore structure with low porosity openings and low connectivity extension within the clearance zone. Densification is achieved through localized hot-pressing: controlled temperature and pressure are applied within the clearance zone. The temperature is set within the softening temperature range below the melting point of the skeleton layer, and the pressure is set within a range sufficient to compact the pore walls without disrupting overall continuity. Furthermore, the contact surface of the hot-pressing tool is machined to match the contour of the clearance zone, ensuring that the hot-pressing effect only covers the clearance zone and not the adjacent bypass pathways. After hot-pressing, the pore walls within the clearance zone are compacted and fixed, and the through-holes are cut off within the clearance zone, forming a non-through-hole state. To ensure that the ion transport path is not completely blocked by the clearance zone, continuous openings of the bypass pathways are retained on the side of the clearance zone adjacent to the adjacent area. This is achieved by setting the outer edge of the hot-pressing contact surface as a gradually compacted edge during hot-pressing, maintaining a connectable pore density in the outer region near the adjacent area, and creating a continuous lateral connectivity zone along the outer edge of the clearance zone. Thus, the avoidance zone forms a clear avoidance range at the thickness gradient abrupt change region, while the micropore connection direction of the adjacent region runs around and connects along the outer edge of the avoidance zone. The two are spatially continuous, so that the influence of the thickness gradient abrupt change region on the channel connectivity balance is limited to the inside of the avoidance zone, and the local structural instability caused by the abrupt change region is prevented from spreading rapidly along the channel straight direction.

[0035] Based on the directional rearrangement results and the boundary of the avoidance zone, a duct stability list is generated. This list is then used to define the stable and controllable areas of the structure, providing a list-based constraint for subsequent structural reinforcement. In practice, the diaphragm plane is first divided into multiple duct unit regions using a fixed grid size. The fixed grid size is smaller than the width of the avoidance zone and smaller than the width of the surrounding zone of the adjacent area, ensuring that the avoidance zone and adjacent areas are fully represented at the duct unit region scale. Each duct unit region has its four corner coordinates recorded and assigned a unique number. Subsequently, the micropore connectivity characteristics are recorded for each duct unit region. These characteristics are described in text and bound to a directional reference. The textual description includes the main direction connectivity ratio, the lateral direction connectivity ratio, the starting and ending boundary positions of the bypass paths, the distribution sections of continuous bending patterns, and the location of the minimum path spacing. The starting and ending boundary positions of the bypass paths are represented by boundary coordinate points relative to the contour of the thickness gradient abrupt change region, ensuring direct location during subsequent reference. Next, the information of the avoidance zone is recorded. The coordinates of the inner boundary, outer boundary, width, densification method, and location of continuous openings at the outer edge of the avoidance zone are written into the list. The pore unit region containing the avoidance zone is marked as the avoidance zone unit. The avoidance zone unit is subject to two constraints in the list: non-penetration constraint and bypass outer edge connectivity constraint. Then, the regional attributes are defined according to the thickness gradient evolution map: the pore unit region with a gradual thickness change and not covered by the thickness gradient concentration zone in the time series is defined as the structurally stable region; the pore unit region covered by the thickness gradient concentration zone and subject to directional rearrangement rules in the thickness gradient evolution map is defined as the controllable region; and the avoidance zone unit is defined as the restricted penetration region and is marked independently. Finally, the sets of structurally stable zones, adjustable zones, and restricted through zones, along with their corresponding micropore connectivity characteristics and avoidance zone constraint characteristics, are summarized to form a duct stability list. This list can be directly used to define the layout of subsequent reinforcement structures: structurally stable zones are used to maintain the existing duct layout, adjustable zones are used to support the introduction of subsequent collaborative response structures, and restricted through zones are used to maintain avoidance constraints and continue to exist as risk isolation zones.

[0036] Based on the duct stability list, a continuous geometric traction ridge network is constructed in the unstable area. The deformation direction of each structural layer of the diaphragm is uniformly guided by the traction ridge network, so that different levels of structure form a cooperative displacement relationship under thermal, electrical and stress disturbances, and the risk traction cable is woven in the diaphragm plane by the traction ridge network. This step is carried out under the premise that a duct stability inventory has been generated and the boundary coordinates of the unstable region, the controllable region, the structurally stable region, the main connection direction of the duct, and the lateral connection direction of the duct can be given. The purpose is to construct a continuous geometric traction ridge network in the unstable region. The geometric traction ridge network guides the deformation direction of each structural layer of the diaphragm in a unified manner, so that different structural levels form a coordinated displacement relationship under the combined action of temperature disturbance, electric field disturbance, and stress disturbance, and the geometric traction ridge network is woven into a risk traction cable in the diaphragm plane. The specific implementation process is as follows: Based on the duct stability list, vulnerable areas are located using point-to-point positioning, and the deployment direction, line spacing, and endpoint anchoring rules of the geometric traction ridge network are all specified as directly executable geometric layout parameters. In practice, the boundary coordinates of vulnerable areas in the duct stability list are projected point-by-point onto the diaphragm plane coordinate frame, forming closed boundary lines. The area within these closed boundary lines is the vulnerable area. The main connection direction of the duct corresponding to the same vulnerable area in the duct stability list is defined as the duct main axis direction, and the lateral connection direction is defined as the duct lateral axis direction. Subsequently, a traction main axis direction is established within the vulnerable area, intersecting the duct main axis direction. This traction main axis direction is expressed in the diaphragm plane by a reference straight line passing through the center of the vulnerable area. A secondary traction axis direction is established perpendicular to the traction main axis direction. Next, multiple ridge center trajectories are planned along the traction axis within the unstable region. Each ridge center trajectory consists of starting point coordinates, ending point coordinates, and intermediate point coordinates. The starting point and ending point coordinates both fall inside the closed boundary line of the unstable region and maintain a preset setback distance from the closed boundary line. The setback distance is taken as the minimum safe width between the outer edge of the avoidance zone and the boundary of the adjustable zone, thus ensuring that the geometric traction ridge network will not encroach on the avoidance zone or cross into the structural stability zone. The planar spacing between the ridge center trajectories adopts a uniform value. The selection of the spacing follows the principle of compatibility between coverage density and channel maintenance rules: the spacing is less than the lateral guiding connection spacing recorded in the channel stability list within the adjustable zone, and the spacing is greater than the effective influence width of a single ridge after formation in the plane, so that adjacent ridges can form a continuous grid traction effect after formation without compressing the channel connection path to an excessively dense state. Finally, an endpoint anchoring zone is set on the center trajectory of each ridge line. The endpoint anchoring zone is located at a fixed distance inward from the boundary of the unstable area. The length of the endpoint anchoring zone is twice the effective influence width of the ridge line, so that the endpoint has sufficient geometric transition length for subsequent weaving of multiple ridge lines into a continuous risk traction cable.

[0037] Based on the established ridge center trajectory and anchoring rules, the ridge center trajectory is transformed into an integrated ridge-like undulation running through all structural layers through the geometric shaping of the diaphragm body. The height distribution, width distribution, and transition curvature of the ridge-like undulation are all specified, ensuring that the deformation direction is geometrically locked to a unified traction axis direction. In specific implementation, ridge-like undulations are formed at the diaphragm plane position corresponding to the unstable region using directional imprinting. The imprinting is completed by the cooperation of the upper imprinting surface and the lower support surface: the upper imprinting surface processes continuous raised stripe contours along the ridge center trajectory, with the raised stripe contours completely coinciding with the ridge center trajectory in the plane; the lower support surface processes continuous recessed stripe contours along the corresponding position, with the recessed stripe contours completely matching the raised stripe contours in the planar projection. During the imprinting process, the diaphragm completes the forming of the entire unstable area through a single continuous cutting motion between the upper imprinting surface and the lower support surface, creating a continuous ridge-like undulation corresponding to the center trajectory of each ridge line. The ridge apex line of the ridge-like undulation coincides with the center trajectory of the ridge line, and the ridge width is set to a preset ridge width value. The preset ridge width value is less than the bandwidth of the bypass path in the adjustable area of ​​the channel stability list, ensuring that the ridge-like undulation does not cover the main connecting zone of the bypass path. The ridge height is set in a segmented and gradual manner: within the end anchoring zone, the ridge height gradually increases from zero to the working ridge height, with a continuous slope transition during the increase to avoid steps at the end; within the working zone inside the unstable area, the ridge height remains at the working ridge height; in the adjacent zone near the outer edge of the avoidance zone, the ridge height gradually decreases from the working ridge height to the transition ridge height, with the transition ridge height being less than the working ridge height, creating a flexible transition near the avoidance zone and preventing the displacement from being concentrated towards the boundary of the avoidance zone. To ensure that all structural layers of the diaphragm form a consistent geometric baseline at the same location, the imprinting depth adopts a through-type geometric offset along the thickness direction: a continuous convex ridge is formed on the upper surface, and a corresponding continuous concave ridge is formed on the lower surface. The convex and concave ridges are aligned in the thickness direction, allowing different layers to share the same ridge-like undulating neutral guide line at the same planar position. Through this through-type geometric offset, when temperature disturbances cause local thermal expansion and contraction, when electric field disturbances cause local electrostriction, and when stress disturbances cause local tension and compression, the most easily deformable direction of the diaphragm in the ridge-like undulating region is limited to the sliding displacement along the extension direction of the ridge apex line. The local displacement of the diaphragm in the non-ridge-like undulating region is pulled by the continuous direction of the ridge-like undulation and merges into the traction axis direction, thereby enabling different layers to exhibit a coordinated displacement relationship of unidirectional and rhythmic displacement, reducing the risk of uncontrolled pore rearrangement caused by interlayer relative misalignment.

[0038] Based on the formation of continuous ridge-like undulations with a unified traction direction, multiple ridge-like undulations are woven together in a plane according to the unstable propagation paths identified in the duct stability list. This upgrades the geometric traction ridge network from parallel ridges to an interlaced grid, and the connection method, connection position, and connection transition of the interlaced grid are all specified as repeatable weaving rules, thus forming a risk traction cable. In specific implementation, firstly, a first set of continuous ridges is retained along the traction main axis in the unstable region. The first set of continuous ridges is directly formed by the aforementioned ridge center trajectory. Then, a second set of connecting ridges is planned along the traction secondary axis in the same unstable region. The starting point of the second set of connecting ridges falls within the end anchorage area of ​​the first set of continuous ridges, and the ending point falls within the end anchorage area of ​​the adjacent first set of continuous ridges. This allows the second set of connecting ridges to bridge adjacent ridges in a plane, forming a bridging channel capable of bearing lateral displacement traction. The bridging points are arranged with a fixed pitch: along the length of the first group of continuous ridges, bridging points are set inward from the end anchoring area at a fixed pitch, which is an integer multiple of the ridge width, ensuring uniform distribution of bridging points in the plane. At each bridging point, a continuous staggered connection is formed by the second group of connecting ridges, creating a diamond or rectangular grid pattern in the plane. The grid pattern remains consistent throughout the unstable area, preventing sudden changes in grid density that could lead to localized congestion in the displacement channel. The geometric transition of the woven connection uses a continuous curve transition: when the second group of connecting ridges connects to the first group of continuous ridges, the connection angle is an obtuse transition angle, and the transition section length is three times the ridge width, ensuring a smooth connection between the ridge height and width at the connection point, avoiding sharp angles and broken lines that could cause localized stress concentration. The second group of connecting ridges maintains a transition ridge height during the bridging process, ensuring that the bridging channel does not suppress the main connecting zone of the bypass path in the duct stability list when bearing lateral traction. After the interlacing is completed, the geometric traction ridge network forms a continuous mesh traction skeleton in the unstable region. The traction skeleton provides long-range guidance in the direction of the main traction axis and provides lateral diversion in the direction of the secondary traction axis. This allows any local displacement tendency from temperature disturbance, electric field disturbance, or stress disturbance to be captured by the traction skeleton and guided into a controllable path within the mesh. Local displacements are distributed to adjacent pathways at mesh nodes, forming multi-channel diffusion rather than single-point bursts. Finally, a dominant mesh link that runs through the unstable region is selected along the high-risk advancement direction corresponding to the thickness gradient evolution pattern. This dominant mesh link is defined as the main chain of the risk traction cable, and several parallel mesh links are selected on both sides of the main chain as auxiliary chains of the risk traction cable. This allows the risk traction cable to exist continuously in the diaphragm plane in the form of main chain traction and auxiliary chain diversion.

[0039] Using the risk traction cable as the overall support framework, a breathing phase traction dome is constructed, which periodically expands and contracts according to the rhythm of thermal pulse changes, thereby regulating the synchronous reconstruction of the internal temperature field and electric field of the new energy battery separator and dynamically adjusting the advancement rhythm of the degradation front. This step is based on the premise of a continuously woven and interconnected risk traction cable within the diaphragm plane. Without introducing additional materials, a breathing-type phase traction dome is constructed by reversibly geometrically shaping the spatial morphology of the diaphragm body. This dome can periodically expand and contract in response to changes in thermal pulses, allowing the internal temperature and electric fields of the diaphragm to be synchronously reconstructed along the traction path of the risk traction cable. This synchronous reconstruction process is then used to dynamically adjust the advancement rhythm of the degradation front. The specific implementation process is as follows: Using the risk traction cable as the overall support framework, the coverage area, reference plane, arch segment orientation, and boundary setback parameters of the breathing phase traction dome are determined, ensuring that the dome has a repeatable geometric deployment reference within the diaphragm. In specific implementation, the main and auxiliary chains of the risk traction cable are deployed point-by-point in the diaphragm plane coordinates, forming a continuous path line traversing the unstable area, and this continuous path line is defined as the ridgeline projection of the dome. Using the geometric mid-surface of the diaphragm as the reference plane, the ridgeline projection is segmented and calibrated on the reference plane, dividing the risk traction cable along its length into multiple adjacent arch segments. Each arch segment has coordinates of its starting point, ending point, and center. The arch segment length is taken as an integer value representing the minimum usable span between the outer edge of the avoidance zone and the boundary of the controllable area. This allows the arch segments to be continuously arranged within the controllable zone and prevents the ends from entering the structurally stable zone. Subsequently, a dome boundary line is established for each arch segment. This dome boundary line extends in the same direction as the ridge projection of the risk traction cable in the plane, and symmetrically expands to both sides of the ridge projection to form a strip-shaped coverage area. The outer boundary of this strip-shaped coverage area maintains a fixed setback distance from the controllable zone boundary marked on the duct stability list. This fixed setback distance is taken as the maximum undulation influence width of the geometric traction ridge network within the controllable zone, thus ensuring that the structurally stable zone is not drawn in during the dome's expansion and contraction. Deformation channel; then, using the outer edge of the clearance strip as the inner limiting boundary, the inner edge of the dome and the outer edge of the clearance strip maintain a continuous parallel relationship and a preset buffer distance, which is half the width of the clearance strip, so that the shape change of the dome will not compress the non-through constraint of the clearance strip; after the above coverage area is determined, the initial arch height and working arch height are set at the ridge projection position of each arch segment. The initial arch height is zero arch height, and the working arch height is the target height of reversible undulation. The working arch height is taken as a number of times the initial thickness of the diaphragm and is maintained within the allowable elastic deformation of the diaphragm. Within the specified range, a gradual change zone for arch height is set at both the start and end points of the arch segment. The length of the gradual change zone is one-quarter of the length of the arch segment, so that the arch segments can be connected end to end to form a continuous dome outline. Based on the above limitations, the breathing phase traction dome is geometrically defined as a spatial form consisting of multiple continuous arch segments, with the risk traction cable as the ridge projection, the adjustable zone as the outer boundary, the outer edge of the inner avoidance zone as the limiting boundary, and having an initial arch height and a working arch height with a gradual change zone transition. This provides directly executable geometric parameters for subsequent periodic deployment and retraction.

[0040] The breathing-type phase traction dome is periodically extended and retracted along its arch height based on the rhythm of thermal pulse changes. The extension and retraction sequence, amplitude, and distribution are tied to the positions of the main and auxiliary chains of the risk traction cable, ensuring that the deformation path of the dome aligns with the traction path. Specifically, the rhythm of thermal pulse changes is defined as the periodic fluctuation sequence of the diaphragm's internal temperature over time. Each rising segment of the thermal pulse is designated as the dome extension segment, and each falling segment as the dome recovery segment. At the start of the dome extension segment, the arch segment corresponding to the main chain of the risk traction cable is used as the pilot arch segment. This pilot arch segment gradually rises from its initial arch height along its thickness to the working arch height. During the rising process, the maximum rise is maintained at the center of the arch segment, while the rise at both ends of the arch segment smoothly transitions through the arch height gradient zone, ensuring the arch segment presents a continuous arch shape without forming a platform. After the pilot arch section is raised, the adjacent arch sections corresponding to the risk traction cable auxiliary chains are raised sequentially. The raising sequence proceeds along the weaving direction of the risk traction cable in the diaphragm plane, so that the dome unfolds in a segment-by-segment expansion pattern along the traction path on the plane. The unfolding range of each arch section is related to its distance from the thickness gradient concentration zone in the thickness gradient evolution map. Arch sections closer to the thickness gradient use a higher working arch height, and arch sections farther away use a lower working arch height. This provides greater spatial relaxation for the dome unfolding near high-risk areas and further away from high-risk areas. The location of the high-risk area provides less spatial slack, ensuring that deformation resources are concentrated on suppressing instability propagation. At the start of the dome recovery phase, the recovery sequence is the reverse of the deployment sequence. First, the arch segment corresponding to the auxiliary chain of the risk traction cable gradually descends from the working arch height to the initial arch height, and then the pilot arch segment corresponding to the main chain of the risk traction cable descends to the initial arch height. During the descent, the center position of the arch segment maintains the maximum descent amount and smoothly transitions through the arch height gradient zone, so that the dome recovery presents a recovery pattern of gradually retracting along the traction path on the plane. This ensures that the periodic recovery and deployment are consistent with the rhythm of thermal pulse changes. The lifting speed of the unfolding section changes in the same direction as the rising speed of the thermal pulse, and the falling speed of the retraction section changes in the same direction as the falling speed of the thermal pulse, so that the inhalation-type unfolding and exhalation-type retraction of the dome are synchronized with the rhythm of thermal pulse changes on the time axis. Through this segmented lifting and falling bound to the risk traction cable, the breathing phase traction dome transforms the volume changes and local deformation tendencies caused by temperature fluctuations into geometric fluctuation changes that can be controlled and distributed along the traction path, so that the deformation inside the diaphragm no longer randomly gathers in a local area, but is organized into a predictable unfolding and retraction trajectory along the risk traction cable.

[0041] During the periodic deployment and retraction of the breathing-type phase-traction dome, the spatial scale and path curvature of the diaphragm are altered by the dome's expansion and retrieval. This synchronously reconstructs the spatial distribution of the temperature and electric fields along the risk traction cable's path, and dynamically adjusts the pace of the degradation front's advance using the rhythmic changes in these reconstructed temperature and electric fields. Specifically, during the dome's deployment phase, the arch section's elevation creates a controllable expansion zone in the thickness direction within the diaphragm's internal space. This expansion zone is continuously distributed along the ridge projection of the risk traction cable. The presence of this expansion zone transforms the heat diffusion path within the diaphragm plane from a short-range concentrated diffusion that might have formed around the heat source into a long-range dispersed diffusion along the ridge projection direction. The localized temperature rise area is elongated and decomposed into multiple temperature peak zones distributed along the arch section along the traction path. These temperature peak zones form a continuous transition through the arch section's gradient zone, thereby reducing the steep temperature gradient near the abrupt thickness gradient abruptness region. Simultaneously, the dome... The unfolding process alters the geometric boundary morphology within the diaphragm, causing a rearrangement of the electric field distribution in the arch section's lifting region. The high-intensity concentration zone of the electric field in the plane is pulled into a banded distribution along the risk traction cable direction. This high-intensity band expands at the center of the arch section and smoothly connects at the ends through a transition zone, transforming the electric field intensity from a point-like peak to a continuous distribution along the traction path, preventing the electric field from maintaining high intensity in a single location for an extended period. In the dome recovery section, the arch section gradually descends, causing the expanded band to gradually contract. The dispersed temperature field and the banded electric field distribution are gradually recovered to their baseline state along the risk traction cable direction, maintaining the temperature field and... The consistent spatial direction, recycling sequence, and recycling rhythm of the electric field ensure that temperature and electric field changes are not out of sync in time or space. Since the degradation behavior of biodegradable polymers is influenced by both temperature and electric fields, these fields fluctuate and migrate synchronously under the traction of the dome's expansion and contraction. This uniformly stretches the degradation driving conditions spatially and rhythmically distributes them temporally. The degradation front, near the region of abrupt changes in thickness gradient, no longer experiences sudden transitions caused by localized temperature rises and concentrated electric fields. Instead, it gains spatial relaxation in the expansion section and propagates dispersedly along the traction path, returning to the baseline in the recycling section. This creates a propulsion interval, allowing the degradation front to advance in a gradual manner corresponding to the rhythm of thermal pulse changes. Furthermore, the risk traction cable, as the overall support framework, maintains the continuity of the traction path throughout the dome's expansion and contraction, ensuring that the synchronous reconstruction of the temperature and electric fields always unfolds along the same traction path. The direction of the degradation front's advance is constrained within the propulsion channel consistent with the traction path. During the advancement process, the degradation front is segmented, buffered, and rhythmized, ultimately achieving the goal of regulating the synchronous reconstruction of the internal temperature and electric fields of the diaphragm and dynamically adjusting the pace of the degradation front's advance through the breathing-type phase traction dome.

[0042] This invention transforms the originally discrete and abrupt degradation behavior within the membrane into a continuously guided evolutionary process by simultaneously sensing and coordinating the temperature field, electric field, and structural evolution process. Utilizing the step-by-step traction of degradation front fingerprints, thickness gradient evolution maps, and risk traction mechanisms, the temperature and electric fields maintain coordinated changes in space and time, avoiding degradation rate jumps caused by the superposition of local conditions. This effectively suppresses the tendency of the membrane structure to expand from local instability to the periphery, improving the overall stability and safety margin of the membrane during long-term charge-discharge cycles.

[0043] This invention, through the synergistic design of micropore connectivity, geometric traction ridges, and a breathing-type phase traction dome, enables the diaphragm to actively regulate and slowly release energy under thermal, electrical, and stress disturbances. During operation, the diaphragm structure can periodically adjust its shape in accordance with the thermal pulse rhythm, guiding the internal energy and stress to disperse and release along a preset path. This maintains a balanced distribution of ion transport channels, reduces the risk of abnormal current density concentration, and allows the diaphragm to achieve higher operational reliability and lifespan stability while meeting electrochemical performance requirements.

[0044] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A method for enhancing the separator of new energy batteries based on biodegradable polymers, characterized in that, Includes the following steps: A panoramic light ripple record for simultaneous observation of temperature and electric field is constructed. A continuous trajectory of heating points is formed by aligning the time axis and the spatial axis. A temperature-electric field coupled image band is generated based on the continuous trajectory of heating points. By continuously tracking the trajectory of hot spots based on temperature-electric field coupled image bands, the starting position and expansion boundary of the degradation rate surge are determined, and a degradation front fingerprint is generated. Based on the degradation front fingerprint, time-resolved unfolding analysis of the new energy battery separator structure was performed to reconstruct the structural profile of the separator thickness as a function of time and spatial location, and obtain the thickness gradient evolution map. Based on the thickness gradient evolution map, the orientation of the micropores inside the diaphragm is rearranged directionally, and avoidance zones are introduced in the regions of abrupt changes in thickness gradient to generate a pore stability list to define the stable and controllable regions of the structure. Based on the duct stability list, a continuous geometric traction ridge network is constructed in the unstable area. The deformation direction of each structural layer of the diaphragm is uniformly guided by the traction ridge network, so that different levels of structure form a cooperative displacement relationship under thermal, electrical and stress disturbances, and the risk traction cable is woven in the diaphragm plane by the traction ridge network. Using the risk traction cable as the overall support framework, a breathing phase traction dome is constructed, which periodically expands and contracts according to the rhythm of thermal pulse changes, thereby regulating the synchronous reconstruction of the internal temperature field and electric field of the new energy battery separator and dynamically adjusting the advancement pace of the degradation front.

2. The method for enhancing the separator of a new energy battery based on biodegradable polymers according to claim 1, characterized in that, The steps for generating temperature-electric field coupled image bands are as follows: During the charge and discharge cycle of new energy batteries, continuous imaging is performed on the area containing the effective working area of ​​the separator to form a panoramic light pattern record covering the separator area, and the temperature distribution and electric field distribution at the corresponding time are collected simultaneously. Based on panoramic light pattern recording, temperature distribution, and electric field distribution, the data at each acquisition time are time-stamped and bound, and a unified spatial coordinate is established using the diaphragm plane to achieve alignment between the time axis and the spatial axis. After aligning the time axis with the spatial axis, the continuous heating point trajectory in the membrane plane is extracted by combining the local temperature rise region in the temperature distribution, the local concentrated region in the electric field distribution, and the changes in the light pattern. Based on the trajectory of continuous heating points, a local field of view including the area surrounding the heating point is cropped at the corresponding time. The light pattern, temperature distribution and electric field distribution are superimposed and stitched together in time sequence to generate a temperature-electric field coupled image band.

3. The method for enhancing the separator of a new energy battery based on biodegradable polymers according to claim 2, characterized in that, The steps for generating a degradation front fingerprint are as follows: Based on the temperature-electric field coupled image strip, the image strip is unfolded step by step according to the acquisition time sequence. Under the unified spatial coordinates, the temperature rise area and the electric field intensity concentration area are extracted to form the initial recording unit of the hot point and construct the initial trajectory skeleton of the hot point. Based on the initial trajectory skeleton of the hot spot, a corresponding relationship is established between the hot spot regions at adjacent time points, and short-term missing parts in the trajectory are interpolated to form a continuous trajectory link of the hot spot. The temperature change amplitude and electric field intensity change amplitude are extracted time by time along the continuous trajectory link of the heating point to determine the earliest time when the temperature change and electric field change are synchronously enhanced, and the corresponding center coordinates of the heating point are determined as the starting position of the sudden increase in degradation rate. Centered on the starting position of the sudden increase in degradation rate, the outer edge advancement coordinates of the hot spot region contour at each subsequent time point are recorded to form an extended boundary sequence arranged in chronological order, generating a degradation front fingerprint.

4. The method for enhancing the separator of a new energy battery based on biodegradable polymers according to claim 3, characterized in that, After forming a continuous trajectory link of the hot spot, the spatial expansion direction of the hot spot region contour is used as the boundary advancement direction constraint, and the temperature change amplitude marker and electric field intensity change amplitude marker corresponding to each moment are simultaneously retained in the expansion boundary sequence, so that the degradation front fingerprint has both spatial boundary continuity and field intensity evolution correlation.

5. The method for enhancing the separator of a new energy battery based on biodegradable polymers according to claim 3, characterized in that, The steps for generating the thickness gradient evolution map are as follows: Based on the coordinates of the reference point for reading the degradation front fingerprint and the front boundary sequence, the forward and lateral directions are established on the diaphragm plane, and the main unfolding path and parallel unfolding path are arranged along the forward direction. The diaphragm thickness was collected point by point along the main deployment path and the parallel deployment path according to time nodes, forming a raw thickness record sequence bound to time nodes, deployment paths and spatial locations; The thickness distribution surface at each time node is generated based on the original thickness record sequence, and the structural profile is reconstructed along the unfolding path, and the structural profile is synchronously aligned with the leading edge boundary. Thickness gradient concentration zones and gradient abrupt change regions are extracted from structural profiles and compiled in chronological order to form a thickness gradient evolution map.

6. The method for enhancing the separator of a new energy battery based on biodegradable polymers according to claim 5, characterized in that, The steps for generating the duct stability list are as follows: Based on the thickness gradient evolution map, determine the coordinates of the reference point, the outline of the thickness gradient concentration zone, and the outline of the thickness gradient abrupt change region, and establish the main direction and lateral direction on the diaphragm plane; Based on the contour of the thickness gradient abrupt region, a surrounding strip boundary is constructed, forming the body region of the thickness gradient abrupt region, the adjacent region of the thickness gradient abrupt region, and the distant region of the thickness gradient abrupt region. Based on the regional division, the direction of the micropore connection is rearranged in a directional manner, so that the distant region forms a main direction through-path, the adjacent region forms a through-path along the contour tangentially, and the body region maintains a low through-path. In the region of abrupt change in thickness gradient, an avoidance zone that follows the contour is constructed, and a low-connectivity hole structure is formed within the avoidance zone, while a bypass connection path is retained at the outer edge of the avoidance zone. A pore stability list is generated based on the micropore connectivity characteristics and the avoidance zone boundary, and the structural stability zone and controllable zone are defined based on the pore stability list.

7. The method for enhancing the separator of a new energy battery based on biodegradable polymers according to claim 6, characterized in that, The risk traction mechanism is formed as follows: Based on the duct stability list, read the boundary coordinates of the unstable area, the main connection direction of the duct, and the lateral connection direction of the duct. Determine the direction of the traction main shaft within the unstable area and plan the center trajectory of multiple ridge lines. The diaphragm is oriented and imprinted along the center trajectory of the ridge line, so that the center trajectory of the ridge line is transformed into a continuous ridge-like undulation that runs through each structural layer, thereby unifying the deformation guidance direction of each structural layer of the diaphragm. Based on continuous ridge-like undulations, in-plane weaving connections are made at preset bridging positions, so that multiple ridge-like undulations form a continuous geometric traction ridge network, and form a risk traction cable in the diaphragm plane.

8. The method for enhancing the separator of a new energy battery based on biodegradable polymers according to claim 7, characterized in that, The ridge center trajectory extends continuously along the traction main axis in the unstable region. The ridge-like undulations have a gradually changing anchoring zone at the end and a height transition zone near the avoidance zone, so that the geometric traction ridge network forms a continuous guide in the traction main axis direction. In the transverse direction, it forms a diversion channel through weaving connection, so that the displacement of the diaphragm under the action of temperature disturbance, electric field disturbance and stress disturbance is controlled and distributed along the risk traction cable and kept in coordination.

9. The method for enhancing the separator of a new energy battery based on biodegradable polymers according to claim 7, characterized in that, Using a risk traction cable as a supporting framework, a breathing phase traction dome is constructed. The dome is periodically expanded and contracted according to the rhythm of thermal pulse changes to guide the synchronous reconstruction of the internal temperature and electric fields of the new energy battery separator. The following steps are taken to regulate the advancement process of the degradation front: Using the risk traction cable as the supporting framework, multiple adjacent arch segments are divided along the direction of the risk traction cable within the controllable area to determine the reference plane, coverage area, arch segment orientation and boundary setback parameters of the dome. Based on the rhythm of thermal pulse changes inside the diaphragm, each arch segment is driven to periodically expand and contract between the initial arch height and the working arch height, so that the dome can be expanded and contracted segment by segment along the direction of the risk traction cable. During the periodic opening and closing of the dome, the temperature and electric field distribution inside the membrane are reconstructed synchronously along the risk traction cable, so that the degradation front advances rhythmically along the traction path.

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